/* roulang page: index */
:root {
            --color-primary: #141414;
            --color-primary-soft: #1e1e1e;
            --color-accent: #FF5C1A;
            --color-accent-hover: #e64d0e;
            --color-accent-soft: #fff0e8;
            --color-bg: #F6F6F0;
            --color-surface: #ffffff;
            --color-border: #E5E5E5;
            --color-text: #1a1a1a;
            --color-text-muted: #6B6B6B;
            --color-text-light: #9a9a9a;
            --color-footer-text: #c0c0c0;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-section: 80px;
            --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 16px;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--color-accent);
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        :focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--space-lg);
            padding-right: var(--space-lg);
        }

        .section {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 720px;
            margin-bottom: var(--space-xl);
            line-height: 1.7;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: var(--color-accent-soft);
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: var(--space-md);
        }

        /* Header/Nav */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: var(--shadow-sm);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            position: relative;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            flex: 1;
        }

        .nav-right {
            justify-content: flex-end;
        }

        .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-muted);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-link:hover {
            color: var(--color-accent);
            background: var(--color-accent-soft);
        }

        .nav-link.active {
            color: var(--color-accent);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }

        .logo-area {
            flex-shrink: 0;
            padding: 0 var(--space-lg);
            text-align: center;
        }

        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-primary);
            white-space: nowrap;
            transition: color var(--transition-fast);
            cursor: pointer;
        }

        .logo-text:hover {
            color: var(--color-accent);
        }

        .logo-text .logo-b {
            color: var(--color-accent);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--color-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-toggle:hover {
            background: var(--color-bg);
        }

        .mobile-menu {
            display: none;
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            padding: var(--space-md) var(--space-lg);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
        }

        .mobile-menu.open {
            max-height: 500px;
            padding: var(--space-md) var(--space-lg);
        }

        .mobile-menu .nav-link {
            display: block;
            padding: 10px 0;
            font-size: 1rem;
            border-bottom: 1px solid var(--color-border);
        }
        .mobile-menu .nav-link:last-child {
            border-bottom: none;
        }

        /* Hero */
        .hero-section {
            min-height: 80vh;
            display: flex;
            align-items: center;
            position: relative;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: var(--space-section) 0;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(20,20,20,0.88) 0%, rgba(20,20,20,0.65) 50%, rgba(20,20,20,0.8) 100%);
            z-index: 1;
        }

        .hero-section .container {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-2xl);
            width: 100%;
        }

        .hero-content {
            flex: 1.2;
            color: #fff;
        }

        .hero-brand-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.1);
            border: 1px solid rgba(255,255,255,0.25);
            border-radius: 30px;
            padding: 6px 16px;
            font-size: 0.85rem;
            font-weight: 500;
            color: #f0f0f0;
            backdrop-filter: blur(8px);
            margin-bottom: var(--space-lg);
        }

        .hero-brand-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-accent);
            display: inline-block;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.5); }
        }

        .hero-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.03em;
            margin-bottom: var(--space-md);
            color: #fff;
        }

        .hero-title .highlight {
            color: var(--color-accent);
        }

        .hero-desc {
            font-size: 1.05rem;
            color: rgba(255,255,255,0.85);
            max-width: 560px;
            line-height: 1.8;
            margin-bottom: var(--space-xl);
        }

        .hero-cta {
            display: flex;
            gap: var(--space-md);
            flex-wrap: wrap;
            margin-bottom: var(--space-xl);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            border: none;
            cursor: pointer;
            transition: all var(--transition-base);
            font-size: 0.95rem;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn:focus-visible {
            outline-offset: 3px;
        }

        .btn-primary {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(255,92,26,0.35);
        }
        .btn-primary:hover {
            background: var(--color-accent-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255,92,26,0.45);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(255,92,26,0.3);
        }

        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid #fff;
        }
        .btn-outline:hover {
            background: #fff;
            color: var(--color-primary);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 14px 32px;
            font-size: 1.05rem;
        }

        .hero-data-panel {
            flex: 0.8;
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
            min-width: 280px;
        }

        .hero-data-card {
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.18);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            backdrop-filter: blur(12px);
            color: #fff;
            transition: all var(--transition-base);
        }
        .hero-data-card:hover {
            background: rgba(255,255,255,0.14);
            border-color: rgba(255,255,255,0.3);
            transform: translateY(-2px);
        }

        .hero-data-number {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-accent);
            line-height: 1.2;
            font-variant-numeric: tabular-nums;
        }

        .hero-data-label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.75);
            margin-top: 4px;
        }

        /* Services Section */
        .services-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 0.8fr;
            gap: var(--space-lg);
        }

        .service-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-xl);
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            position: relative;
            overflow: hidden;
        }
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--color-accent);
            opacity: 0;
            transition: opacity var(--transition-base);
        }
        .service-card:hover::before {
            opacity: 1;
        }
        .service-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }

        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background: var(--color-accent-soft);
            color: var(--color-accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: var(--space-md);
        }

        .service-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
        }

        .service-card p {
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            flex: 1;
        }

        .service-data-card {
            background: var(--color-primary);
            border-radius: var(--radius-md);
            padding: var(--space-xl);
            color: #fff;
            box-shadow: var(--shadow-lg);
            display: flex;
            flex-direction: column;
            justify-content: center;
            border: none;
        }
        .service-data-card::before {
            display: none;
        }
        .service-data-card:hover {
            border: none;
            box-shadow: var(--shadow-xl);
        }
        .service-data-card .service-icon {
            background: rgba(255,255,255,0.12);
            color: var(--color-accent);
        }
        .service-data-card h3 {
            color: #fff;
        }
        .service-data-card p {
            color: rgba(255,255,255,0.75);
        }
        .service-data-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1.2;
        }

        .brand-intro {
            margin-top: var(--space-2xl);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl);
            box-shadow: var(--shadow-md);
            position: relative;
        }
        .brand-intro::before {
            content: '';
            position: absolute;
            left: 0;
            top: var(--space-lg);
            bottom: var(--space-lg);
            width: 4px;
            background: var(--color-accent);
            border-radius: 0 4px 4px 0;
        }
        .brand-intro h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-md);
        }
        .brand-intro p {
            font-size: 0.98rem;
            color: var(--color-text-muted);
            line-height: 1.8;
        }

        /* Stats Section */
        .stats-section {
            background: var(--color-primary);
            color: #fff;
            padding: var(--space-section) 0;
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(255,92,26,0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--space-xl);
            position: relative;
            z-index: 1;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--color-accent);
            letter-spacing: -0.03em;
            line-height: 1.2;
            font-variant-numeric: tabular-nums;
        }
        .stat-label {
            font-size: 0.95rem;
            color: rgba(255,255,255,0.7);
            margin-top: var(--space-xs);
        }

        /* News Section */
        .news-layout {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: var(--space-xl);
        }

        .news-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }

        .news-list-item {
            display: flex;
            gap: var(--space-md);
            padding: var(--space-md);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .news-list-item:hover,
        .news-list-item.active {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-lg);
            transform: translateX(4px);
        }

        .news-date {
            flex-shrink: 0;
            width: 72px;
            text-align: center;
            padding: var(--space-sm);
            background: var(--color-bg);
            border-radius: var(--radius-sm);
            align-self: flex-start;
        }
        .news-date .day {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-accent);
            line-height: 1.1;
        }
        .news-date .month {
            font-size: 0.75rem;
            color: var(--color-text-muted);
        }

        .news-list-item h4 {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
            line-height: 1.4;
        }
        .news-list-item p {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            margin: 0;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-detail {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            display: flex;
            flex-direction: column;
        }

        .news-detail-image {
            height: 220px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .news-detail-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.5), transparent);
        }

        .news-detail-body {
            padding: var(--space-xl);
            flex: 1;
        }
        .news-detail-body .tag {
            display: inline-block;
            background: var(--color-accent-soft);
            color: var(--color-accent);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 14px;
            margin-bottom: var(--space-sm);
        }
        .news-detail-body h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            line-height: 1.4;
        }
        .news-detail-body p {
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin-bottom: var(--space-md);
        }
        .read-more-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-accent);
            cursor: pointer;
            transition: color var(--transition-fast);
            border: none;
            background: none;
            padding: 0;
        }
        .read-more-btn:hover {
            color: var(--color-accent-hover);
        }
        .read-more-btn i {
            font-size: 0.7rem;
            transition: transform var(--transition-fast);
        }
        .read-more-btn:hover i {
            transform: translateX(4px);
        }

        /* Solution Section */
        .solution-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: var(--space-lg);
            counter-reset: step;
        }
        .step-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-xl);
            box-shadow: var(--shadow-md);
            position: relative;
            transition: all var(--transition-base);
            counter-increment: step;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }
        .step-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--color-border);
            line-height: 1;
            margin-bottom: var(--space-md);
            transition: color var(--transition-base);
            font-variant-numeric: tabular-nums;
        }
        .step-card:hover .step-number {
            color: var(--color-accent);
        }
        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin: 0;
        }

        /* Task Progress Section */
        .task-progress-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .progress-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }
        .progress-item {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            padding: var(--space-md) var(--space-lg);
            background: var(--color-bg);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            transition: all var(--transition-base);
        }
        .progress-item.completed {
            border-color: #4caf50;
            background: #f0faf0;
        }
        .progress-item.current {
            border-color: var(--color-accent);
            background: var(--color-accent-soft);
            box-shadow: 0 0 12px rgba(255,92,26,0.15);
        }
        .progress-check {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            font-weight: 700;
            flex-shrink: 0;
            background: var(--color-border);
            color: var(--color-text-muted);
        }
        .progress-item.completed .progress-check {
            background: #4caf50;
            color: #fff;
        }
        .progress-item.current .progress-check {
            background: var(--color-accent);
            color: #fff;
            animation: pulse 1.5s infinite;
        }
        .progress-info {
            flex: 1;
        }
        .progress-info h5 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-primary);
            margin: 0 0 2px 0;
        }
        .progress-info p {
            font-size: 0.82rem;
            color: var(--color-text-muted);
            margin: 0;
        }
        .progress-bar-wrap {
            width: 120px;
            height: 6px;
            background: var(--color-border);
            border-radius: 3px;
            overflow: hidden;
            flex-shrink: 0;
        }
        .progress-bar-fill {
            height: 100%;
            background: var(--color-accent);
            border-radius: 3px;
            transition: width 0.6s ease;
        }
        .reward-badge {
            display: inline-block;
            background: #ffd700;
            color: #333;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 14px;
            flex-shrink: 0;
        }

        /* Limited Entry */
        .limited-section {
            background: var(--color-primary);
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .limited-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover;
            opacity: 0.2;
            z-index: 0;
        }
        .limited-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .limited-section .section-title {
            color: #fff;
        }
        .limited-section .section-subtitle {
            color: rgba(255,255,255,0.75);
            margin-left: auto;
            margin-right: auto;
        }
        .countdown-row {
            display: flex;
            gap: var(--space-md);
            justify-content: center;
            margin: var(--space-xl) 0;
            flex-wrap: wrap;
        }
        .countdown-box {
            background: rgba(255,255,255,0.1);
            border: 1px solid rgba(255,255,255,0.2);
            border-radius: var(--radius-md);
            padding: var(--space-md) var(--space-lg);
            min-width: 80px;
        }
        .countdown-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1.2;
            font-variant-numeric: tabular-nums;
        }
        .countdown-label {
            font-size: 0.75rem;
            color: rgba(255,255,255,0.7);
        }

        /* Social Proof */
        .social-proof-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: var(--space-lg);
        }
        .proof-card {
            text-align: center;
            padding: var(--space-xl);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }
        .proof-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .proof-stars {
            color: #ffb400;
            font-size: 1.1rem;
            margin-bottom: var(--space-sm);
            letter-spacing: 2px;
        }
        .proof-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
            margin-bottom: var(--space-sm);
        }
        .proof-card .name {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-primary);
        }

        /* FAQ */
        .faq-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
        }
        .accordion-custom {
            max-width: 800px;
            margin: 0 auto;
        }
        .accordion-item-custom {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: var(--space-sm);
            background: var(--color-bg);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .accordion-item-custom.active {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-md);
            background: var(--color-surface);
        }
        .accordion-header-custom {
            padding: var(--space-md) var(--space-lg);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-md);
            font-weight: 600;
            color: var(--color-primary);
            font-size: 0.98rem;
            user-select: none;
            transition: all var(--transition-fast);
        }
        .accordion-header-custom:hover {
            color: var(--color-accent);
        }
        .accordion-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--color-border);
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            transition: all var(--transition-base);
            font-weight: 400;
        }
        .accordion-item-custom.active .accordion-icon {
            background: var(--color-accent);
            color: #fff;
            transform: rotate(45deg);
        }
        .accordion-body-custom {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 var(--space-lg);
        }
        .accordion-item-custom.active .accordion-body-custom {
            max-height: 300px;
            padding: 0 var(--space-lg) var(--space-md) var(--space-lg);
        }
        .accordion-body-custom p {
            font-size: 0.92rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin: 0;
        }

        /* Contact */
        .contact-section {
            background: var(--color-bg);
        }
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-2xl);
            align-items: start;
        }
        .contact-info h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-md);
        }
        .contact-info p {
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin-bottom: var(--space-md);
        }
        .contact-form input,
        .contact-form textarea,
        .contact-form select {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 12px 16px;
            font-size: 0.95rem;
            color: var(--color-text);
            width: 100%;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            margin-bottom: var(--space-md);
            box-shadow: none;
        }
        .contact-form input:focus,
        .contact-form textarea:focus,
        .contact-form select:focus {
            border-color: var(--color-accent);
            box-shadow: 0 0 0 2px rgba(255,92,26,0.2);
            outline: none;
        }
        .contact-form textarea {
            min-height: 120px;
            resize: vertical;
        }
        .contact-form label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
            display: block;
        }

        /* Footer */
        .site-footer {
            background: var(--color-primary);
            color: var(--color-footer-text);
            padding: var(--space-section) 0 0;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr;
            gap: var(--space-2xl);
            padding-bottom: var(--space-2xl);
        }
        .footer-brand h4 {
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: var(--space-sm);
        }
        .footer-brand h4 span {
            color: var(--color-accent);
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.6);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--space-md);
        }
        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-col ul li {
            margin-bottom: var(--space-sm);
        }
        .footer-col ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.88rem;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding: var(--space-lg) 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--space-sm);
            font-size: 0.8rem;
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.5);
            font-size: 0.8rem;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .services-grid {
                grid-template-columns: 1fr 1fr;
            }
            .service-data-card {
                grid-column: span 2;
                flex-direction: row;
                gap: var(--space-lg);
                align-items: center;
                justify-content: space-around;
                text-align: center;
            }
            .service-data-card p {
                max-width: 300px;
            }
            .news-layout {
                grid-template-columns: 1fr;
            }
            .contact-wrapper {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: span 2;
            }
            .hero-section .container {
                flex-direction: column;
                text-align: center;
            }
            .hero-cta {
                justify-content: center;
            }
            .hero-data-panel {
                flex-direction: row;
                flex-wrap: wrap;
                justify-content: center;
                min-width: auto;
            }
            .hero-data-card {
                min-width: 200px;
                flex: 1;
            }
        }

        @media (max-width: 768px) {
            .nav-left,
            .nav-right {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .header-inner {
                justify-content: space-between;
                min-height: 60px;
            }
            .logo-area {
                padding: 0 var(--space-sm);
                position: absolute;
                left: 50%;
                transform: translateX(-50%);
            }
            .mobile-menu {
                display: block;
            }
            .mobile-menu:not(.open) {
                max-height: 0;
                padding: 0 var(--space-lg);
                border-top: none;
            }
            .hero-section {
                min-height: auto;
                padding: var(--space-3xl) 0;
            }
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .hero-data-panel {
                flex-direction: column;
            }
            .hero-data-card {
                min-width: auto;
            }
            .section {
                padding-top: 48px;
                padding-bottom: 48px;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .services-grid {
                grid-template-columns: 1fr;
            }
            .service-data-card {
                grid-column: span 1;
                flex-direction: column;
            }
            .news-detail-image {
                height: 160px;
            }
            .solution-steps {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-brand {
                grid-column: span 1;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .progress-bar-wrap {
                width: 60px;
            }
            .countdown-num {
                font-size: 1.5rem;
            }
            .countdown-box {
                padding: var(--space-sm) var(--space-md);
                min-width: 60px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
            .hero-cta {
                flex-direction: column;
                gap: var(--space-sm);
            }
            .btn {
                justify-content: center;
                width: 100%;
            }
            .news-list-item {
                flex-direction: column;
                gap: var(--space-sm);
            }
            .news-date {
                width: auto;
                display: flex;
                gap: 6px;
                align-items: baseline;
            }
            .logo-text {
                font-size: 1.3rem;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #141414;
            --color-primary-soft: #1e1e1e;
            --color-accent: #FF5C1A;
            --color-accent-hover: #e64d0e;
            --color-accent-soft: #fff0e8;
            --color-bg: #F6F6F0;
            --color-surface: #ffffff;
            --color-border: #E5E5E5;
            --color-text: #1a1a1a;
            --color-text-muted: #6B6B6B;
            --color-text-light: #9a9a9a;
            --color-footer-text: #c0c0c0;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-section: 80px;
            --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 16px;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-accent);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--space-lg);
            padding-right: var(--space-lg);
        }
        .section {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 720px;
            margin-bottom: var(--space-xl);
            line-height: 1.7;
        }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: var(--color-accent-soft);
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: var(--space-md);
        }
        /* Header/Nav */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            position: relative;
        }
        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            flex: 1;
        }
        .nav-right {
            justify-content: flex-end;
        }
        .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-muted);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover {
            color: var(--color-accent);
            background: var(--color-accent-soft);
        }
        .nav-link.active {
            color: var(--color-accent);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }
        .logo-area {
            flex-shrink: 0;
            padding: 0 var(--space-lg);
            text-align: center;
        }
        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-primary);
            white-space: nowrap;
            transition: color var(--transition-fast);
            cursor: pointer;
        }
        .logo-text:hover {
            color: var(--color-accent);
        }
        .logo-text .logo-b {
            color: var(--color-accent);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--color-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .mobile-toggle:hover {
            background: var(--color-accent-soft);
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            padding: var(--space-md) var(--space-lg);
            gap: var(--space-sm);
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            z-index: 1001;
            box-shadow: var(--shadow-lg);
        }
        .mobile-menu.open {
            display: flex;
        }
        /* Breadcrumbs */
        .breadcrumb-bar {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: var(--space-md) 0;
        }
        .breadcrumb-list {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
            font-size: 0.85rem;
            color: var(--color-text-muted);
        }
        .breadcrumb-list li {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .breadcrumb-list li:not(:last-child)::after {
            content: '/';
            color: var(--color-text-light);
            font-size: 0.75rem;
        }
        .breadcrumb-list a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }
        .breadcrumb-list a:hover {
            color: var(--color-accent);
        }
        .breadcrumb-list .current {
            color: var(--color-primary);
            font-weight: 600;
        }
        /* Hero */
        .category-hero {
            position: relative;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            min-height: 480px;
            display: flex;
            align-items: center;
            padding: var(--space-3xl) 0;
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(20,20,20,0.88) 0%, rgba(20,20,20,0.62) 55%, rgba(20,20,20,0.35) 100%);
            z-index: 1;
        }
        .category-hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 680px;
        }
        .category-hero .hero-label {
            display: inline-block;
            background: var(--color-accent);
            color: #fff;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: var(--space-md);
        }
        .category-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: var(--space-md);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }
        .category-hero .hero-subtitle {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.85);
            line-height: 1.8;
            max-width: 560px;
            margin-bottom: var(--space-xl);
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-md);
            align-items: center;
        }
        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-accent);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            border: 2px solid var(--color-accent);
            transition: all var(--transition-base);
            cursor: pointer;
            text-align: center;
            justify-content: center;
        }
        .btn-primary:hover {
            background: var(--color-accent-hover);
            border-color: var(--color-accent-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            border: 2px solid rgba(255,255,255,0.7);
            transition: all var(--transition-base);
            cursor: pointer;
            text-align: center;
            justify-content: center;
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline-dark {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--color-primary);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 10px 24px;
            border-radius: var(--radius-md);
            border: 2px solid var(--color-primary);
            transition: all var(--transition-base);
            cursor: pointer;
            text-align: center;
            justify-content: center;
        }
        .btn-outline-dark:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-text-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--color-accent);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            cursor: pointer;
        }
        .btn-text-link:hover {
            color: var(--color-accent-hover);
            gap: 10px;
        }
        /* Cards */
        .content-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .content-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }
        .content-card .card-image {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--color-border);
            position: relative;
        }
        .content-card .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .content-card:hover .card-image img {
            transform: scale(1.04);
        }
        .content-card .card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--color-accent);
            color: #fff;
            font-size: 0.72rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 4px;
            letter-spacing: 0.04em;
            z-index: 2;
        }
        .content-card .card-body {
            padding: var(--space-lg);
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .content-card .card-date {
            font-size: 0.8rem;
            color: var(--color-text-light);
            margin-bottom: var(--space-sm);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .content-card .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            line-height: 1.5;
        }
        .content-card .card-excerpt {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            flex: 1;
            margin-bottom: var(--space-md);
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        /* Service Deep Cards */
        .service-deep-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .service-deep-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-xl);
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .service-deep-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }
        .service-deep-card .service-icon {
            width: 48px;
            height: 48px;
            background: var(--color-accent-soft);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-size: 1.3rem;
            margin-bottom: var(--space-md);
        }
        .service-deep-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
        }
        .service-deep-card p {
            font-size: 0.92rem;
            color: var(--color-text-muted);
            line-height: 1.8;
            flex: 1;
        }
        /* Stats Bar */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
            margin-top: var(--space-2xl);
        }
        .stat-item {
            text-align: center;
            padding: var(--space-xl) var(--space-md);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }
        .stat-item .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-item .stat-number span {
            color: var(--color-accent);
        }
        .stat-item .stat-label {
            font-size: 0.85rem;
            color: var(--color-text-muted);
        }
        /* Process Steps */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
            counter-reset: step;
            position: relative;
        }
        .process-step {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-xl);
            box-shadow: var(--shadow-sm);
            position: relative;
            transition: all var(--transition-base);
            counter-increment: step;
        }
        .process-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }
        .process-step::before {
            content: counter(step);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--color-primary);
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            border-radius: 50%;
            margin-bottom: var(--space-md);
        }
        .process-step h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
        }
        .process-step p {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin-bottom: 0;
        }
        /* FAQ Accordion */
        .faq-accordion {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: var(--space-md);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .faq-item:hover {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--space-lg);
            cursor: pointer;
            font-weight: 600;
            color: var(--color-primary);
            font-size: 1rem;
            user-select: none;
            transition: background var(--transition-fast);
            gap: var(--space-md);
        }
        .faq-item .faq-question:hover {
            background: var(--color-accent-soft);
        }
        .faq-item .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform var(--transition-base);
            color: var(--color-accent);
            font-size: 1.1rem;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            padding: 0 var(--space-lg);
            color: var(--color-text-muted);
            font-size: 0.92rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            max-height: 400px;
            padding: 0 var(--space-lg) var(--space-lg);
        }
        /* CTA Section */
        .cta-banner {
            background: var(--color-primary);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl) var(--space-xl);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--space-lg);
            box-shadow: var(--shadow-xl);
        }
        .cta-banner h3 {
            color: #fff;
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .cta-banner p {
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
            margin-bottom: 0;
        }
        .cta-banner .btn-primary {
            background: var(--color-accent);
            border-color: var(--color-accent);
        }
        .cta-banner .btn-primary:hover {
            background: #fff;
            border-color: #fff;
            color: var(--color-primary);
        }
        /* Footer */
        .site-footer {
            background: var(--color-primary);
            color: var(--color-footer-text);
            padding: var(--space-2xl) 0 0;
            margin-top: var(--space-section);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: var(--space-xl);
            padding-bottom: var(--space-2xl);
        }
        .site-footer h4 {
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: var(--space-md);
        }
        .site-footer h4 span {
            color: var(--color-accent);
        }
        .site-footer h5 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: var(--space-md);
            letter-spacing: 0.04em;
        }
        .site-footer p {
            font-size: 0.88rem;
            line-height: 1.8;
            color: var(--color-footer-text);
        }
        .site-footer ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .site-footer ul li {
            margin-bottom: var(--space-sm);
        }
        .site-footer ul li a {
            color: var(--color-footer-text);
            font-size: 0.88rem;
            transition: color var(--transition-fast);
        }
        .site-footer ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.12);
            padding: var(--space-lg) 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-sm);
            font-size: 0.8rem;
            color: var(--color-footer-text);
        }
        .footer-bottom a {
            color: var(--color-footer-text);
            transition: color var(--transition-fast);
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .nav-left,
            .nav-right {
                gap: var(--space-sm);
            }
            .nav-link {
                padding: 6px 8px;
                font-size: 0.82rem;
            }
            .logo-area {
                padding: 0 var(--space-md);
            }
            .logo-text {
                font-size: 1.35rem;
            }
            .service-deep-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
                justify-content: space-between;
                min-height: 60px;
            }
            .nav-left,
            .nav-right {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .logo-area {
                padding: 0;
                position: absolute;
                left: 50%;
                transform: translateX(-50%);
            }
            .logo-text {
                font-size: 1.3rem;
            }
            .category-hero {
                min-height: 420px;
            }
            .category-hero h1 {
                font-size: 2rem;
            }
            .category-hero .hero-subtitle {
                font-size: 1rem;
            }
            .service-deep-grid {
                grid-template-columns: 1fr;
            }
            .process-steps {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--space-md);
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
            .section {
                padding-top: 48px;
                padding-bottom: 48px;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .cta-banner {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
            .category-hero {
                min-height: 360px;
                padding: var(--space-2xl) 0;
            }
            .category-hero h1 {
                font-size: 1.6rem;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-outline-light {
                width: 100%;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-sm);
            }
            .stat-item .stat-number {
                font-size: 1.6rem;
            }
            .content-card .card-body {
                padding: var(--space-md);
            }
        }

/* roulang page: category2 */
:root {
            --color-primary: #141414;
            --color-primary-soft: #1e1e1e;
            --color-accent: #FF5C1A;
            --color-accent-hover: #e64d0e;
            --color-accent-soft: #fff0e8;
            --color-bg: #F6F6F0;
            --color-surface: #ffffff;
            --color-border: #E5E5E5;
            --color-text: #1a1a1a;
            --color-text-muted: #6B6B6B;
            --color-text-light: #9a9a9a;
            --color-footer-text: #c0c0c0;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-section: 80px;
            --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 16px;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--color-accent);
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--space-lg);
            padding-right: var(--space-lg);
        }

        .section {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 720px;
            margin-bottom: var(--space-xl);
            line-height: 1.7;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: var(--color-accent-soft);
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: var(--space-md);
        }

        /* Header/Nav */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: var(--shadow-sm);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            position: relative;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            flex: 1;
        }

        .nav-right {
            justify-content: flex-end;
        }

        .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-muted);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-link:hover {
            color: var(--color-accent);
            background: var(--color-accent-soft);
        }

        .nav-link.active {
            color: var(--color-accent);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }

        .logo-area {
            flex-shrink: 0;
            padding: 0 var(--space-lg);
            text-align: center;
        }

        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-primary);
            white-space: nowrap;
            transition: color var(--transition-fast);
            cursor: pointer;
        }

        .logo-text:hover {
            color: var(--color-accent);
        }

        .logo-text .logo-b {
            color: var(--color-accent);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--color-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-toggle:hover {
            background: var(--color-accent-soft);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            padding: var(--space-md) var(--space-lg);
            gap: var(--space-sm);
        }

        .mobile-menu .nav-link {
            font-size: 1rem;
            padding: 12px 8px;
            border-bottom: 1px solid var(--color-border);
            border-radius: 0;
        }

        .mobile-menu .nav-link:last-child {
            border-bottom: none;
        }

        .mobile-menu.open {
            display: flex;
        }

        /* Breadcrumb */
        .breadcrumb-bar {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: var(--space-md) 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 0.9rem;
            color: var(--color-text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }

        .breadcrumb a:hover {
            color: var(--color-accent);
        }

        .breadcrumb .separator {
            color: var(--color-text-light);
        }

        .breadcrumb .current {
            color: var(--color-accent);
            font-weight: 600;
        }

        /* Hero - Lead Capture */
        .hero-lead {
            background: var(--color-primary);
            background-image: linear-gradient(rgba(20, 20, 20, 0.82), rgba(20, 20, 20, 0.9)), url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            padding: var(--space-3xl) 0;
            position: relative;
        }

        .hero-lead-inner {
            display: flex;
            align-items: center;
            gap: var(--space-2xl);
            flex-wrap: wrap;
        }

        .hero-lead-content {
            flex: 1 1 480px;
        }

        .hero-lead-title {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: var(--space-md);
            color: #ffffff;
            letter-spacing: -0.02em;
        }

        .hero-lead-title .accent {
            color: var(--color-accent);
        }

        .hero-lead-desc {
            font-size: 1.15rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.85);
            max-width: 540px;
            margin-bottom: var(--space-lg);
        }

        .hero-lead-stats {
            display: flex;
            gap: var(--space-xl);
            flex-wrap: wrap;
            margin-top: var(--space-md);
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--color-accent);
            letter-spacing: -0.02em;
        }

        .hero-stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 2px;
        }

        .hero-lead-form-wrap {
            flex: 0 0 380px;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            box-shadow: var(--shadow-xl);
            color: var(--color-text);
        }

        .hero-lead-form-wrap h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: var(--space-xs);
            color: var(--color-primary);
        }

        .hero-lead-form-wrap p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-bottom: var(--space-md);
        }

        .hero-lead-form-wrap label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-text);
        }

        .hero-lead-form-wrap input,
        .hero-lead-form-wrap select {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            font-size: 0.95rem;
            color: var(--color-text);
            margin-bottom: var(--space-md);
            width: 100%;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            box-shadow: none;
        }

        .hero-lead-form-wrap input:focus,
        .hero-lead-form-wrap select:focus {
            outline: none;
            border-color: var(--color-accent);
            box-shadow: 0 0 0 2px var(--color-accent-soft);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-sm);
            padding: 12px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.4;
            cursor: pointer;
            border: none;
            transition: all var(--transition-base);
            text-align: center;
        }

        .btn-primary {
            background: var(--color-accent);
            color: #ffffff;
        }

        .btn-primary:hover {
            background: var(--color-accent-hover);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--color-accent);
            color: var(--color-accent);
        }

        .btn-outline:hover {
            background: var(--color-accent);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn-block {
            width: 100%;
        }

        /* Content Cards */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-xl);
        }

        .card-article {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

        .card-article:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }

        .card-article-img {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--color-primary-soft);
        }

        .card-article-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .card-article:hover .card-article-img img {
            transform: scale(1.04);
        }

        .card-article-body {
            padding: var(--space-lg);
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .card-article-meta {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 0.8rem;
            color: var(--color-text-muted);
            margin-bottom: var(--space-sm);
        }

        .card-article-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--color-accent);
            background: var(--color-accent-soft);
            padding: 2px 10px;
            border-radius: 12px;
        }

        .card-article-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.45;
            margin-bottom: var(--space-sm);
        }

        .card-article-excerpt {
            font-size: 0.92rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            flex: 1;
            margin-bottom: var(--space-md);
        }

        .card-article-link {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-accent);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: color var(--transition-fast);
            align-self: flex-start;
        }

        .card-article-link:hover {
            color: var(--color-accent-hover);
        }

        .card-article-link i {
            font-size: 0.8rem;
            transition: transform var(--transition-fast);
        }

        .card-article-link:hover i {
            transform: translateX(3px);
        }

        /* Capability Section */
        .capability-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }

        .capability-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-2xl);
            align-items: start;
        }

        .capability-text h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-md);
        }

        .capability-text p {
            font-size: 0.98rem;
            color: var(--color-text-muted);
            line-height: 1.8;
            margin-bottom: var(--space-md);
        }

        .capability-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .capability-list li {
            display: flex;
            align-items: flex-start;
            gap: var(--space-sm);
            font-size: 0.95rem;
            color: var(--color-text);
            margin-bottom: var(--space-sm);
            line-height: 1.6;
        }

        .capability-list li i {
            color: var(--color-accent);
            font-size: 0.9rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* Method Steps */
        .method-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
            counter-reset: step;
        }

        .method-step {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-xl) var(--space-lg);
            position: relative;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .method-step:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }

        .method-step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--color-accent);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: 50%;
            margin-bottom: var(--space-md);
        }

        .method-step h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
        }

        .method-step p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.65;
            margin: 0;
        }

        /* FAQ */
        .faq-section {
            background: var(--color-surface);
        }

        .accordion {
            max-width: 840px;
            margin: 0 auto;
            list-style: none;
            padding: 0;
        }

        .accordion-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: var(--space-md);
            background: #fff;
            overflow: hidden;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .accordion-item:hover {
            border-color: #d0d0d0;
        }

        .accordion-item.is-active {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-md);
        }

        .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-lg) var(--space-xl);
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-primary);
            cursor: pointer;
            transition: color var(--transition-fast);
            line-height: 1.5;
        }

        .accordion-title:hover {
            color: var(--color-accent);
        }

        .accordion-title::after {
            content: '+';
            font-size: 1.3rem;
            font-weight: 400;
            color: var(--color-accent);
            transition: transform var(--transition-base);
            flex-shrink: 0;
            margin-left: var(--space-md);
        }

        .accordion-item.is-active .accordion-title::after {
            content: '×';
            font-size: 1.4rem;
        }

        .accordion-content {
            padding: 0 var(--space-xl) var(--space-lg);
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.75;
        }

        .accordion-content p {
            margin: 0;
        }

        /* CTA Section */
        .cta-section {
            background: var(--color-primary);
            color: #fff;
            padding: var(--space-3xl) 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 320px;
            height: 320px;
            background: rgba(255, 92, 26, 0.15);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-inner {
            display: flex;
            align-items: center;
            gap: var(--space-2xl);
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        .cta-text {
            flex: 1 1 480px;
        }

        .cta-text h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: var(--space-md);
            color: #fff;
            letter-spacing: -0.02em;
        }

        .cta-text p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.7;
            margin: 0;
        }

        .cta-actions {
            flex: 0 0 auto;
            display: flex;
            gap: var(--space-md);
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--color-primary);
            color: var(--color-footer-text);
            padding: var(--space-3xl) 0 var(--space-lg);
            border-top: 1px solid #2a2a2a;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: var(--space-2xl);
            margin-bottom: var(--space-2xl);
        }

        .footer-brand h4 {
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: var(--space-sm);
        }

        .footer-brand h4 span {
            color: var(--color-accent);
        }

        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: var(--color-footer-text);
            max-width: 360px;
        }

        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--space-md);
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: var(--space-sm);
        }

        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--color-footer-text);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--space-md);
            padding-top: var(--space-lg);
            border-top: 1px solid #2a2a2a;
            font-size: 0.8rem;
            color: var(--color-text-light);
        }

        .footer-bottom a {
            color: var(--color-text-light);
            transition: color var(--transition-fast);
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .method-steps {
                grid-template-columns: repeat(2, 1fr);
            }

            .capability-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }

            .hero-lead-inner {
                flex-direction: column;
                text-align: center;
            }

            .hero-lead-content {
                text-align: center;
            }

            .hero-lead-desc {
                margin-left: auto;
                margin-right: auto;
            }

            .hero-lead-stats {
                justify-content: center;
            }

            .hero-lead-form-wrap {
                flex: 0 0 auto;
                width: 100%;
                max-width: 480px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --space-section: 48px;
                --space-3xl: 40px;
                --space-2xl: 32px;
                --space-xl: 24px;
                --space-lg: 16px;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .nav-left,
            .nav-right {
                display: none;
            }

            .mobile-toggle {
                display: block;
            }

            .logo-area {
                flex: 1;
                text-align: center;
                padding: 0;
            }

            .header-inner {
                flex-wrap: wrap;
            }

            .mobile-menu.open {
                display: flex;
            }

            .hero-lead-title {
                font-size: 2rem;
            }

            .hero-lead-stats {
                gap: var(--space-lg);
            }

            .hero-stat-number {
                font-size: 1.5rem;
            }

            .card-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }

            .method-steps {
                grid-template-columns: 1fr;
                gap: var(--space-md);
            }

            .cta-inner {
                flex-direction: column;
                text-align: center;
            }

            .cta-actions {
                justify-content: center;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--space-sm);
            }

            .accordion-title {
                padding: var(--space-md) var(--space-lg);
                font-size: 0.95rem;
            }

            .accordion-content {
                padding: 0 var(--space-lg) var(--space-md);
            }
        }

        @media (max-width: 520px) {
            .hero-lead {
                padding: var(--space-2xl) 0;
            }

            .hero-lead-title {
                font-size: 1.7rem;
            }

            .hero-lead-form-wrap {
                padding: var(--space-lg);
            }

            .btn {
                padding: 10px 18px;
                font-size: 0.9rem;
            }

            .section-title {
                font-size: 1.4rem;
            }
        }

/* roulang page: category3 */
:root {
            --color-primary: #141414;
            --color-primary-soft: #1e1e1e;
            --color-accent: #FF5C1A;
            --color-accent-hover: #e64d0e;
            --color-accent-soft: #fff0e8;
            --color-bg: #F6F6F0;
            --color-surface: #ffffff;
            --color-border: #E5E5E5;
            --color-text: #1a1a1a;
            --color-text-muted: #6B6B6B;
            --color-text-light: #9a9a9a;
            --color-footer-text: #c0c0c0;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-section: 80px;
            --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 16px;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-accent);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--space-lg);
            padding-right: var(--space-lg);
        }
        .section {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 720px;
            margin-bottom: var(--space-xl);
            line-height: 1.7;
        }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: var(--color-accent-soft);
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: var(--space-md);
        }
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            position: relative;
        }
        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            flex: 1;
        }
        .nav-right {
            justify-content: flex-end;
        }
        .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-muted);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover {
            color: var(--color-accent);
            background: var(--color-accent-soft);
        }
        .nav-link.active {
            color: var(--color-accent);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }
        .logo-area {
            flex-shrink: 0;
            padding: 0 var(--space-lg);
            text-align: center;
        }
        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-primary);
            white-space: nowrap;
            transition: color var(--transition-fast);
            cursor: pointer;
        }
        .logo-text:hover {
            color: var(--color-accent);
        }
        .logo-text .logo-b {
            color: var(--color-accent);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--color-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .mobile-toggle:hover {
            background: var(--color-accent-soft);
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: var(--space-md);
            gap: var(--space-sm);
            box-shadow: var(--shadow-md);
        }
        .mobile-menu.open {
            display: flex;
        }
        .breadcrumb-bar {
            background: var(--color-primary);
            padding: 14px 0;
            font-size: 0.85rem;
            color: var(--color-text-light);
        }
        .breadcrumb-bar a {
            color: var(--color-footer-text);
            transition: color var(--transition-fast);
        }
        .breadcrumb-bar a:hover {
            color: var(--color-accent);
        }
        .breadcrumb-bar .separator {
            margin: 0 8px;
            color: #555;
        }
        .breadcrumb-bar .current {
            color: var(--color-accent);
        }
        .hero-invite {
            position: relative;
            padding: var(--space-3xl) 0 var(--space-2xl);
            background: linear-gradient(135deg, #141414 0%, #1e1e1e 55%, #2a1f1a 100%);
            color: #fff;
            overflow: hidden;
        }
        .hero-invite::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(255,92,26,0.18) 0%, transparent 68%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-invite::after {
            content: '';
            position: absolute;
            bottom: -160px;
            left: -100px;
            width: 520px;
            height: 520px;
            background: radial-gradient(circle, rgba(255,92,26,0.1) 0%, transparent 65%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-invite .container {
            position: relative;
            z-index: 2;
        }
        .hero-invite-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: var(--space-2xl);
            align-items: center;
        }
        .hero-invite h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.03em;
            margin-bottom: var(--space-lg);
            color: #fff;
        }
        .hero-invite h1 .accent {
            color: var(--color-accent);
        }
        .hero-invite p {
            font-size: 1.05rem;
            color: #d0d0d0;
            max-width: 560px;
            line-height: 1.8;
            margin-bottom: var(--space-xl);
        }
        .invite-progress {
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            backdrop-filter: blur(4px);
        }
        .invite-progress-label {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.9rem;
            color: #ccc;
            margin-bottom: var(--space-md);
        }
        .invite-progress-label strong {
            color: var(--color-accent);
            font-size: 1.3rem;
            font-weight: 700;
        }
        .progress-track {
            height: 10px;
            background: rgba(255,255,255,0.12);
            border-radius: 5px;
            overflow: hidden;
            margin-bottom: var(--space-md);
        }
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--color-accent), #ff8c42);
            border-radius: 5px;
            width: 68%;
            position: relative;
            transition: width 0.6s ease;
        }
        .progress-fill::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 4px;
            height: 100%;
            background: #fff;
            border-radius: 2px;
        }
        .invite-stats {
            display: flex;
            gap: var(--space-xl);
            margin-top: var(--space-lg);
        }
        .invite-stat {
            text-align: center;
        }
        .invite-stat .num {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            display: block;
            line-height: 1.2;
        }
        .invite-stat .label {
            font-size: 0.8rem;
            color: #999;
        }
        .hero-actions {
            display: flex;
            gap: var(--space-md);
            flex-wrap: wrap;
            margin-top: var(--space-xl);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            border: none;
            cursor: pointer;
            transition: all var(--transition-base);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--color-accent);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--color-accent-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255,92,26,0.35);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.4);
        }
        .btn-outline-light:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
            transform: translateY(-2px);
        }
        .btn-secondary {
            background: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-primary);
        }
        .btn-secondary:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-accent-outline {
            background: transparent;
            color: var(--color-accent);
            border: 2px solid var(--color-accent);
        }
        .btn-accent-outline:hover {
            background: var(--color-accent);
            color: #fff;
            transform: translateY(-2px);
        }
        .coop-cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
            gap: var(--space-xl);
            margin-top: var(--space-xl);
        }
        .coop-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .coop-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }
        .coop-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--color-primary-soft);
        }
        .coop-card-body {
            padding: var(--space-xl);
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .coop-card-meta {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            font-size: 0.78rem;
            color: var(--color-text-light);
            margin-bottom: var(--space-md);
        }
        .coop-card-meta .badge {
            background: var(--color-accent-soft);
            color: var(--color-accent);
            padding: 3px 10px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.72rem;
        }
        .coop-card-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-md);
            line-height: 1.45;
        }
        .coop-card-summary {
            font-size: 0.92rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            flex: 1;
            margin-bottom: var(--space-lg);
        }
        .coop-card-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid var(--color-border);
            padding-top: var(--space-md);
        }
        .read-more-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition-fast);
        }
        .read-more-link:hover {
            color: var(--color-accent-hover);
            gap: 10px;
        }
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
            margin-top: var(--space-xl);
            position: relative;
        }
        .process-steps::before {
            content: '';
            position: absolute;
            top: 28px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: var(--color-border);
        }
        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .step-number {
            width: 56px;
            height: 56px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.3rem;
            margin: 0 auto var(--space-md);
            border: 3px solid var(--color-bg);
            box-shadow: 0 0 0 2px var(--color-accent);
        }
        .step-title {
            font-weight: 700;
            color: var(--color-primary);
            font-size: 1.05rem;
            margin-bottom: var(--space-sm);
        }
        .step-desc {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }
        .value-strip {
            background: var(--color-primary);
            padding: var(--space-2xl) 0;
            color: #fff;
        }
        .value-strip-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-xl);
            text-align: center;
        }
        .value-strip-item .num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--color-accent);
            display: block;
            line-height: 1.3;
        }
        .value-strip-item .label {
            font-size: 0.9rem;
            color: #aaa;
        }
        .accordion-custom {
            margin-top: var(--space-xl);
        }
        .accordion-custom .accordion-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: var(--space-md);
            background: var(--color-surface);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .accordion-custom .accordion-item:hover {
            border-color: #ccc;
        }
        .accordion-custom .accordion-header {
            padding: var(--space-lg);
            font-weight: 700;
            color: var(--color-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 1rem;
            user-select: none;
            transition: color var(--transition-fast);
        }
        .accordion-custom .accordion-header:hover {
            color: var(--color-accent);
        }
        .accordion-custom .accordion-icon {
            font-size: 1.2rem;
            color: var(--color-accent);
            transition: transform var(--transition-base);
            flex-shrink: 0;
            margin-left: var(--space-md);
        }
        .accordion-custom .accordion-item.active .accordion-icon {
            transform: rotate(45deg);
        }
        .accordion-custom .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 var(--space-lg);
        }
        .accordion-custom .accordion-item.active .accordion-content {
            max-height: 300px;
            padding: 0 var(--space-lg) var(--space-lg);
        }
        .accordion-custom .accordion-content p {
            color: var(--color-text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
            margin: 0;
        }
        .contact-form-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .contact-form-wrapper {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl);
            box-shadow: var(--shadow-md);
            margin-top: var(--space-xl);
        }
        .contact-form-wrapper label {
            font-weight: 600;
            color: var(--color-primary);
            font-size: 0.9rem;
            margin-bottom: var(--space-xs);
            display: block;
        }
        .contact-form-wrapper input,
        .contact-form-wrapper textarea,
        .contact-form-wrapper select {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 12px 14px;
            font-size: 0.95rem;
            width: 100%;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            background: #fafafa;
            color: var(--color-text);
            outline: none;
        }
        .contact-form-wrapper input:focus,
        .contact-form-wrapper textarea:focus,
        .contact-form-wrapper select:focus {
            border-color: var(--color-accent);
            box-shadow: 0 0 0 2px rgba(255,92,26,0.15);
            background: #fff;
        }
        .contact-form-wrapper textarea {
            min-height: 120px;
            resize: vertical;
        }
        .form-row {
            margin-bottom: var(--space-lg);
        }
        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
        }
        .cta-band {
            background: linear-gradient(135deg, var(--color-accent) 0%, #ff8c42 100%);
            color: #fff;
            padding: var(--space-2xl);
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--space-lg);
        }
        .cta-band h2 {
            color: #fff;
            font-weight: 800;
            font-size: 1.8rem;
            margin: 0;
            letter-spacing: -0.02em;
        }
        .cta-band p {
            color: rgba(255,255,255,0.9);
            margin: var(--space-sm) 0 0;
            max-width: 500px;
        }
        .cta-band .btn-white {
            background: #fff;
            color: var(--color-accent);
            font-weight: 700;
        }
        .cta-band .btn-white:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .site-footer {
            background: var(--color-primary);
            color: var(--color-footer-text);
            padding: var(--space-2xl) 0 var(--space-xl);
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: var(--space-2xl);
            padding-bottom: var(--space-xl);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            margin-bottom: var(--space-xl);
        }
        .footer-brand h4 {
            color: #fff;
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: var(--space-md);
        }
        .footer-brand h4 span {
            color: var(--color-accent);
        }
        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.7;
            color: var(--color-footer-text);
            max-width: 320px;
        }
        .footer-col h5 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: var(--space-md);
        }
        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-col ul li {
            margin-bottom: var(--space-sm);
        }
        .footer-col ul li a {
            color: var(--color-footer-text);
            font-size: 0.88rem;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-md);
            align-items: center;
            font-size: 0.8rem;
            color: #777;
        }
        .footer-bottom a {
            color: var(--color-footer-text);
            transition: color var(--transition-fast);
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        @media screen and (max-width: 1024px) {
            .hero-invite-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
            .hero-invite h1 {
                font-size: 2.2rem;
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--space-xl);
            }
            .process-steps::before {
                display: none;
            }
            .value-strip-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--space-xl);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-xl);
            }
        }
        @media screen and (max-width: 768px) {
            .header-inner {
                flex-wrap: nowrap;
            }
            .nav-left,
            .nav-right {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .logo-area {
                flex: 1;
                text-align: center;
                padding: 0;
            }
            .mobile-menu {
                display: none;
            }
            .mobile-menu.open {
                display: flex;
            }
            .mobile-menu .nav-link {
                padding: 10px 14px;
                font-size: 0.95rem;
            }
            .mobile-menu .nav-link.active::after {
                display: none;
            }
            .section {
                padding-top: var(--space-2xl);
                padding-bottom: var(--space-2xl);
            }
            .section-title {
                font-size: 1.5rem;
            }
            .hero-invite {
                padding: var(--space-2xl) 0;
            }
            .hero-invite h1 {
                font-size: 1.8rem;
            }
            .hero-actions {
                flex-direction: column;
                gap: var(--space-sm);
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .coop-cards-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
            .coop-card-img {
                height: 180px;
            }
            .process-steps {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
            .value-strip-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-lg);
            }
            .form-grid {
                grid-template-columns: 1fr;
                gap: 0;
            }
            .contact-form-wrapper {
                padding: var(--space-lg);
            }
            .cta-band {
                padding: var(--space-lg);
                flex-direction: column;
                text-align: center;
            }
            .cta-band h2 {
                font-size: 1.4rem;
            }
            .cta-band p {
                margin-left: auto;
                margin-right: auto;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--space-sm);
            }
            .invite-stats {
                gap: var(--space-md);
                flex-wrap: wrap;
            }
        }
        @media screen and (max-width: 520px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
            .hero-invite h1 {
                font-size: 1.6rem;
            }
            .invite-progress {
                padding: var(--space-lg);
            }
            .value-strip-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
            .value-strip-item .num {
                font-size: 2rem;
            }
            .coop-card-body {
                padding: var(--space-lg);
            }
            .breadcrumb-bar {
                font-size: 0.78rem;
                padding: 10px 0;
            }
        }

/* roulang page: category4 */
:root {
            --color-primary: #141414;
            --color-primary-soft: #1e1e1e;
            --color-accent: #FF5C1A;
            --color-accent-hover: #e64d0e;
            --color-accent-soft: #fff0e8;
            --color-bg: #F6F6F0;
            --color-surface: #ffffff;
            --color-border: #E5E5E5;
            --color-text: #1a1a1a;
            --color-text-muted: #6B6B6B;
            --color-text-light: #9a9a9a;
            --color-footer-text: #c0c0c0;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-section: 80px;
            --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 16px;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--color-accent);
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--space-lg);
            padding-right: var(--space-lg);
        }

        .section {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 720px;
            margin-bottom: var(--space-xl);
            line-height: 1.7;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: var(--color-accent-soft);
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: var(--space-md);
        }

        /* Header/Nav */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: var(--shadow-sm);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            position: relative;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            flex: 1;
        }

        .nav-right {
            justify-content: flex-end;
        }

        .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-muted);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-link:hover {
            color: var(--color-accent);
            background: var(--color-accent-soft);
        }

        .nav-link.active {
            color: var(--color-accent);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }

        .logo-area {
            flex-shrink: 0;
            padding: 0 var(--space-lg);
            text-align: center;
        }

        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-primary);
            white-space: nowrap;
            transition: color var(--transition-fast);
            cursor: pointer;
        }

        .logo-text:hover {
            color: var(--color-accent);
        }

        .logo-text .logo-b {
            color: var(--color-accent);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--color-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-toggle:hover {
            background: var(--color-accent-soft);
            color: var(--color-accent);
        }

        .mobile-menu {
            display: none;
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            padding: var(--space-md) var(--space-lg);
            flex-direction: column;
            gap: var(--space-sm);
        }

        .mobile-menu .nav-link {
            display: block;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            text-align: center;
        }

        .mobile-menu .nav-link.active::after {
            display: none;
        }

        /* Breadcrumb */
        .breadcrumb-wrap {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 12px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--color-text-muted);
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }

        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb li:not(:last-child)::after {
            content: '/';
            color: var(--color-text-light);
            font-size: 0.75rem;
        }

        .breadcrumb a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }

        .breadcrumb a:hover {
            color: var(--color-accent);
        }

        .breadcrumb li:last-child a {
            color: var(--color-accent);
            font-weight: 600;
        }

        /* Hero - 白皮书获客 */
        .hero-whitepaper {
            background: var(--color-primary);
            position: relative;
            padding: var(--space-3xl) 0;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        .hero-whitepaper::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(20,20,20,0.95) 0%, rgba(20,20,20,0.82) 50%, rgba(20,20,20,0.66) 100%);
            z-index: 1;
        }

        .hero-whitepaper .container {
            position: relative;
            z-index: 2;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: var(--space-3xl);
            align-items: center;
        }

        .hero-info .section-label {
            background: rgba(255,92,26,0.2);
            color: #FF5C1A;
        }

        .hero-info h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #ffffff;
            line-height: 1.25;
            letter-spacing: -0.03em;
            margin-bottom: var(--space-md);
        }

        .hero-info .hero-subtitle {
            font-size: 1.1rem;
            color: #d0d0d0;
            line-height: 1.8;
            margin-bottom: var(--space-xl);
            max-width: 520px;
        }

        .whitepaper-toc {
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
        }

        .whitepaper-toc h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: var(--space-md);
            letter-spacing: -0.01em;
        }

        .whitepaper-toc ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .whitepaper-toc li {
            color: #c8c8c8;
            font-size: 0.95rem;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            line-height: 1.65;
        }

        .whitepaper-toc li i {
            color: var(--color-accent);
            font-size: 0.8rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        .hero-form-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl);
            box-shadow: var(--shadow-xl);
            border: 1px solid rgba(255,255,255,0.1);
        }

        .hero-form-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
        }

        .hero-form-card .form-desc {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-bottom: var(--space-lg);
            line-height: 1.6;
        }

        .hero-form-card .form-field {
            margin-bottom: var(--space-md);
        }

        .hero-form-card label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .hero-form-card input,
        .hero-form-card select,
        .hero-form-card textarea {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            background: var(--color-bg);
            color: var(--color-text);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .hero-form-card input:focus,
        .hero-form-card select:focus,
        .hero-form-card textarea:focus {
            outline: none;
            border-color: var(--color-accent);
            box-shadow: 0 0 0 3px rgba(255,92,26,0.15);
            background: #ffffff;
        }

        .hero-form-card .btn-primary {
            width: 100%;
            padding: 14px 24px;
            background: var(--color-accent);
            color: #ffffff;
            border: none;
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition-fast), transform var(--transition-fast);
            letter-spacing: 0.01em;
        }

        .hero-form-card .btn-primary:hover {
            background: var(--color-accent-hover);
            transform: translateY(-1px);
        }

        .hero-cover-thumb {
            display: flex;
            align-items: center;
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }

        .hero-cover-thumb img {
            width: 90px;
            height: auto;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-md);
            flex-shrink: 0;
        }

        .hero-cover-thumb .thumb-text {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            line-height: 1.5;
        }

        /* 核心能力 */
        .ability-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
        }

        .ability-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
        }

        .ability-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--color-accent);
        }

        .ability-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background: var(--color-accent-soft);
            color: var(--color-accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: var(--space-md);
        }

        .ability-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            letter-spacing: -0.01em;
        }

        .ability-card p {
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.75;
            margin: 0;
        }

        /* 高密度项目列表 */
        .project-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }

        .project-item {
            display: grid;
            grid-template-columns: 110px 1fr auto;
            gap: var(--space-lg);
            align-items: center;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .project-item:hover {
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
            transform: translateX(2px);
        }

        .project-item .item-img {
            width: 110px;
            height: 72px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: var(--color-bg);
            flex-shrink: 0;
        }

        .project-item .item-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .project-item .item-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 4px;
            letter-spacing: -0.01em;
        }

        .project-item .item-body .item-meta {
            font-size: 0.8rem;
            color: var(--color-text-light);
            margin-bottom: 6px;
        }

        .project-item .item-body p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .project-item .read-btn {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-accent);
            white-space: nowrap;
            padding: 8px 16px;
            border: 2px solid var(--color-accent);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
        }

        .project-item .read-btn:hover {
            background: var(--color-accent);
            color: #ffffff;
        }

        /* 数据指标 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
        }

        .stat-card {
            background: var(--color-primary);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            text-align: center;
            transition: all var(--transition-base);
        }

        .stat-card:hover {
            background: var(--color-primary-soft);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .stat-card .stat-num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: 6px;
        }

        .stat-card .stat-label {
            font-size: 0.85rem;
            color: #c0c0c0;
            font-weight: 500;
        }

        /* 流程 */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: var(--space-md);
            position: relative;
        }

        .process-step {
            text-align: center;
            position: relative;
        }

        .process-step .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-accent);
            color: #ffffff;
            font-weight: 800;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto var(--space-sm);
            box-shadow: 0 4px 12px rgba(255,92,26,0.35);
            position: relative;
            z-index: 2;
        }

        .process-step::before {
            content: '';
            position: absolute;
            top: 22px;
            left: 50%;
            width: 100%;
            height: 2px;
            background: var(--color-border);
            z-index: 1;
        }

        .process-step:last-child::before {
            display: none;
        }

        .process-step h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 4px;
        }

        .process-step p {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            line-height: 1.5;
            margin: 0;
        }

        /* FAQ */
        .faq-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: var(--space-md);
            padding: 0;
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }

        .faq-item .faq-question {
            padding: var(--space-lg);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-md);
            font-weight: 700;
            font-size: 1rem;
            color: var(--color-primary);
            transition: color var(--transition-fast);
            user-select: none;
            -webkit-user-select: none;
        }

        .faq-item .faq-question:hover {
            color: var(--color-accent);
        }

        .faq-item .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--color-accent-soft);
            color: var(--color-accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            transition: transform var(--transition-base);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-item .faq-answer {
            padding: 0 var(--space-lg) var(--space-lg);
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.75;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        /* CTA 联系 */
        .cta-section {
            background: var(--color-primary);
            padding: var(--space-section) 0;
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(20,20,20,0.88);
            z-index: 1;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-3xl);
            align-items: center;
        }

        .cta-info h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: -0.02em;
            margin-bottom: var(--space-md);
        }

        .cta-info p {
            font-size: 1rem;
            color: #c8c8c8;
            line-height: 1.8;
            margin-bottom: var(--space-lg);
        }

        .cta-info ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .cta-info ul li {
            color: #d0d0d0;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .cta-info ul li i {
            color: var(--color-accent);
            font-size: 0.85rem;
        }

        .cta-form-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl);
            box-shadow: var(--shadow-xl);
        }

        .cta-form-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
        }

        .cta-form-card .form-field {
            margin-bottom: var(--space-md);
        }

        .cta-form-card label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .cta-form-card input,
        .cta-form-card select,
        .cta-form-card textarea {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            background: var(--color-bg);
            color: var(--color-text);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .cta-form-card input:focus,
        .cta-form-card select:focus,
        .cta-form-card textarea:focus {
            outline: none;
            border-color: var(--color-accent);
            box-shadow: 0 0 0 3px rgba(255,92,26,0.15);
            background: #ffffff;
        }

        .cta-form-card .btn-submit {
            width: 100%;
            padding: 14px 24px;
            background: var(--color-accent);
            color: #ffffff;
            border: none;
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition-fast), transform var(--transition-fast);
        }

        .cta-form-card .btn-submit:hover {
            background: var(--color-accent-hover);
            transform: translateY(-1px);
        }

        /* Footer */
        .site-footer {
            background: var(--color-primary);
            padding: var(--space-2xl) 0 var(--space-lg);
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: var(--space-2xl);
            padding-bottom: var(--space-xl);
            border-bottom: 1px solid rgba(255,255,255,0.1);
            margin-bottom: var(--space-lg);
        }

        .footer-brand h4 {
            font-size: 1.4rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: var(--space-sm);
        }

        .footer-brand h4 span {
            color: var(--color-accent);
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: var(--color-footer-text);
            line-height: 1.7;
            margin: 0;
            max-width: 380px;
        }

        .footer-col h5 {
            font-size: 1rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: var(--space-md);
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 0.9rem;
            color: var(--color-footer-text);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-md);
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--color-text-light);
        }

        .footer-bottom a {
            color: var(--color-text-light);
            transition: color var(--transition-fast);
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        .footer-bottom span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }

            .hero-form-card {
                max-width: 560px;
                margin: 0 auto;
            }

            .ability-grid {
                grid-template-columns: 1fr;
            }

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .process-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: var(--space-xl);
            }

            .process-step:nth-child(4)::before {
                display: none;
            }

            .cta-grid {
                grid-template-columns: 1fr;
            }

            .cta-form-card {
                max-width: 560px;
                margin: 0 auto;
            }
        }

        @media (max-width: 768px) {
            .nav-left,
            .nav-right {
                display: none;
            }

            .mobile-toggle {
                display: block;
            }

            .header-inner {
                justify-content: space-between;
            }

            .logo-area {
                position: absolute;
                left: 50%;
                transform: translateX(-50%);
                padding: 0;
            }

            .mobile-menu {
                display: none;
            }

            .mobile-menu.open {
                display: flex;
            }

            .hero-info h1 {
                font-size: 2rem;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .project-item {
                grid-template-columns: 80px 1fr;
                gap: var(--space-md);
                padding: var(--space-md);
            }

            .project-item .item-img {
                width: 80px;
                height: 56px;
            }

            .project-item .read-btn {
                grid-column: 1 / -1;
                text-align: center;
                justify-self: stretch;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-md);
            }

            .process-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }

            .process-step::before {
                display: none;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .section {
                padding-top: 48px;
                padding-bottom: 48px;
            }

            .hero-whitepaper {
                padding: var(--space-xl) 0;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }

            .hero-info h1 {
                font-size: 1.7rem;
            }

            .whitepaper-toc {
                padding: var(--space-lg);
            }

            .hero-form-card {
                padding: var(--space-lg);
            }

            .cta-form-card {
                padding: var(--space-lg);
            }

            .stat-card .stat-num {
                font-size: 1.8rem;
            }
        }

/* roulang page: category5 */
:root {
        --color-primary: #141414;
        --color-primary-soft: #1e1e1e;
        --color-accent: #FF5C1A;
        --color-accent-hover: #e64d0e;
        --color-accent-soft: #fff0e8;
        --color-bg: #F6F6F0;
        --color-surface: #ffffff;
        --color-border: #E5E5E5;
        --color-text: #1a1a1a;
        --color-text-muted: #6B6B6B;
        --color-text-light: #9a9a9a;
        --color-footer-text: #c0c0c0;
        --radius-sm: 4px;
        --radius-md: 8px;
        --radius-lg: 12px;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
        --shadow-md: 0 2px 8px rgba(0,0,0,0.04);
        --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
        --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
        --space-xs: 4px;
        --space-sm: 8px;
        --space-md: 16px;
        --space-lg: 24px;
        --space-xl: 32px;
        --space-2xl: 48px;
        --space-3xl: 64px;
        --space-section: 80px;
        --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
        --transition-fast: 0.15s ease;
        --transition-base: 0.25s ease;
        --transition-slow: 0.4s ease;
    }

    html {
        scroll-behavior: smooth;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    body {
        font-family: var(--font-sans);
        background-color: var(--color-bg);
        color: var(--color-text);
        line-height: 1.7;
        font-size: 16px;
        margin: 0;
        padding: 0;
        overflow-x: hidden;
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
    }

    a {
        color: inherit;
        text-decoration: none;
        transition: color var(--transition-fast);
    }

    a:hover {
        color: var(--color-accent);
    }

    button,
    input,
    textarea,
    select {
        font-family: inherit;
        font-size: inherit;
        line-height: inherit;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding-left: var(--space-lg);
        padding-right: var(--space-lg);
    }

    .section {
        padding-top: var(--space-section);
        padding-bottom: var(--space-section);
    }

    .section-title {
        font-size: 2rem;
        font-weight: 700;
        color: var(--color-primary);
        margin-bottom: var(--space-sm);
        letter-spacing: -0.02em;
        line-height: 1.3;
    }

    .section-subtitle {
        font-size: 1.05rem;
        color: var(--color-text-muted);
        max-width: 720px;
        margin-bottom: var(--space-xl);
        line-height: 1.7;
    }

    .section-label {
        display: inline-block;
        font-size: 0.8rem;
        font-weight: 600;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--color-accent);
        background: var(--color-accent-soft);
        padding: 4px 12px;
        border-radius: 20px;
        margin-bottom: var(--space-md);
    }

    /* Header/Nav */
    .site-header {
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        position: sticky;
        top: 0;
        z-index: 999;
        box-shadow: var(--shadow-sm);
    }

    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        min-height: 72px;
        position: relative;
    }

    .nav-left,
    .nav-right {
        display: flex;
        align-items: center;
        gap: var(--space-md);
        flex: 1;
    }

    .nav-right {
        justify-content: flex-end;
    }

    .nav-link {
        font-size: 0.9rem;
        font-weight: 500;
        color: var(--color-text-muted);
        padding: 6px 12px;
        border-radius: var(--radius-sm);
        transition: all var(--transition-fast);
        white-space: nowrap;
        position: relative;
    }

    .nav-link:hover {
        color: var(--color-accent);
        background: var(--color-accent-soft);
    }

    .nav-link.active {
        color: var(--color-accent);
        font-weight: 600;
    }

    .nav-link.active::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--color-accent);
        border-radius: 2px;
    }

    .logo-area {
        flex-shrink: 0;
        padding: 0 var(--space-lg);
        text-align: center;
    }

    .logo-text {
        font-size: 1.6rem;
        font-weight: 800;
        letter-spacing: -0.03em;
        color: var(--color-primary);
        white-space: nowrap;
        transition: color var(--transition-fast);
        cursor: pointer;
    }

    .logo-text:hover {
        color: var(--color-accent);
    }

    .logo-text .logo-b {
        color: var(--color-accent);
    }

    .mobile-toggle {
        display: none;
        background: none;
        border: none;
        font-size: 1.5rem;
        color: var(--color-primary);
        cursor: pointer;
        padding: 8px;
        border-radius: var(--radius-sm);
        transition: background var(--transition-fast);
        z-index: 1000;
    }

    .mobile-toggle:hover {
        background: var(--color-accent-soft);
        color: var(--color-accent);
    }

    .mobile-menu {
        display: none;
        background: var(--color-surface);
        border-top: 1px solid var(--color-border);
        padding: var(--space-md);
        flex-direction: column;
        gap: var(--space-sm);
        box-shadow: var(--shadow-md);
    }

    .mobile-menu.open {
        display: flex;
    }

    .mobile-menu .nav-link {
        padding: 12px 16px;
        font-size: 1rem;
        border-radius: var(--radius-sm);
    }

    /* Breadcrumb */
    .breadcrumb-section {
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-md) 0;
    }

    .breadcrumb-inner {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: var(--space-sm);
        font-size: 0.9rem;
        color: var(--color-text-muted);
    }

    .breadcrumb-inner a {
        color: var(--color-text-muted);
        transition: color var(--transition-fast);
    }

    .breadcrumb-inner a:hover {
        color: var(--color-accent);
    }

    .breadcrumb-sep {
        color: var(--color-text-light);
    }

    .breadcrumb-current {
        color: var(--color-accent);
        font-weight: 600;
    }

    /* Inner Hero */
    .inner-hero {
        position: relative;
        background: var(--color-primary);
        background-image: linear-gradient(rgba(20,20,20,0.82), rgba(20,20,20,0.88)), url('/assets/images/backpic/back-2.webp');
        background-size: cover;
        background-position: center;
        padding: var(--space-3xl) 0;
        color: #fff;
        min-height: 320px;
        display: flex;
        align-items: center;
    }

    .inner-hero-title {
        font-size: 2.6rem;
        font-weight: 800;
        letter-spacing: -0.03em;
        margin-bottom: var(--space-md);
        line-height: 1.25;
        color: #fff;
    }

    .inner-hero-title .accent {
        color: var(--color-accent);
    }

    .inner-hero-desc {
        font-size: 1.15rem;
        color: rgba(255,255,255,0.85);
        max-width: 680px;
        line-height: 1.8;
    }

    .inner-hero-badge {
        display: inline-block;
        background: var(--color-accent);
        color: #fff;
        font-size: 0.8rem;
        font-weight: 700;
        padding: 4px 14px;
        border-radius: 20px;
        margin-bottom: var(--space-md);
        letter-spacing: 0.06em;
    }

    /* High-density List */
    .training-list {
        display: flex;
        flex-direction: column;
        gap: var(--space-md);
    }

    .training-item {
        display: flex;
        align-items: flex-start;
        gap: var(--space-lg);
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        padding: var(--space-lg);
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        cursor: pointer;
    }

    .training-item:hover {
        border-color: var(--color-accent);
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px);
    }

    .training-item-img {
        flex-shrink: 0;
        width: 120px;
        height: 120px;
        border-radius: var(--radius-sm);
        overflow: hidden;
        border: 1px solid var(--color-border);
    }

    .training-item-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .training-item-body {
        flex: 1;
        min-width: 0;
    }

    .training-item-head {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: var(--space-sm);
        margin-bottom: var(--space-sm);
    }

    .training-item-tag {
        display: inline-block;
        font-size: 0.75rem;
        font-weight: 600;
        background: var(--color-accent-soft);
        color: var(--color-accent);
        padding: 2px 10px;
        border-radius: 12px;
        letter-spacing: 0.04em;
    }

    .training-item-date {
        font-size: 0.8rem;
        color: var(--color-text-light);
    }

    .training-item-title {
        font-size: 1.25rem;
        font-weight: 700;
        color: var(--color-primary);
        margin-bottom: var(--space-sm);
        line-height: 1.4;
    }

    .training-item-desc {
        font-size: 0.95rem;
        color: var(--color-text-muted);
        line-height: 1.7;
        margin-bottom: var(--space-sm);
    }

    .training-item-action {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 0.9rem;
        font-weight: 600;
        color: var(--color-accent);
        transition: all var(--transition-fast);
    }

    .training-item-action:hover {
        color: var(--color-accent-hover);
        gap: 10px;
    }

    /* Category intro */
    .cat-intro {
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-lg);
        padding: var(--space-2xl);
        box-shadow: var(--shadow-sm);
        margin-bottom: var(--space-3xl);
    }

    .cat-intro p {
        color: var(--color-text-muted);
        line-height: 1.9;
        margin-bottom: var(--space-md);
        font-size: 1.02rem;
    }

    .cat-intro p:last-child {
        margin-bottom: 0;
    }

    .cat-intro-highlight {
        color: var(--color-accent);
        font-weight: 600;
    }

    /* Stats strip */
    .stats-strip {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-md);
        margin-bottom: var(--space-2xl);
    }

    .stat-block {
        background: var(--color-primary);
        color: #fff;
        border-radius: var(--radius-md);
        padding: var(--space-xl) var(--space-lg);
        text-align: center;
    }

    .stat-block .stat-num {
        font-size: 2.2rem;
        font-weight: 800;
        color: var(--color-accent);
        line-height: 1.2;
        letter-spacing: -0.02em;
    }

    .stat-block .stat-label {
        font-size: 0.85rem;
        color: rgba(255,255,255,0.7);
        margin-top: var(--space-xs);
    }

    /* Deep content */
    .deep-content {
        background: var(--color-surface);
        border-radius: var(--radius-lg);
        border: 1px solid var(--color-border);
        padding: var(--space-2xl);
        box-shadow: var(--shadow-sm);
    }

    .deep-content h3 {
        font-size: 1.4rem;
        font-weight: 700;
        margin-bottom: var(--space-md);
        color: var(--color-primary);
    }

    .deep-content p {
        color: var(--color-text-muted);
        line-height: 1.9;
        margin-bottom: var(--space-md);
    }

    /* Process steps */
    .process-steps {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-lg);
        margin-top: var(--space-xl);
    }

    .process-step {
        text-align: center;
        position: relative;
        padding-top: var(--space-lg);
    }

    .process-step:not(:last-child)::after {
        content: '';
        position: absolute;
        top: 20px;
        right: -50%;
        width: 100%;
        height: 2px;
        background: var(--color-border);
        z-index: 0;
    }

    .process-step-num {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: var(--color-accent);
        color: #fff;
        font-weight: 700;
        font-size: 1rem;
        margin: 0 auto var(--space-sm);
        position: relative;
        z-index: 1;
    }

    .process-step-title {
        font-size: 0.95rem;
        font-weight: 600;
        color: var(--color-primary);
        margin-bottom: var(--space-xs);
    }

    .process-step-desc {
        font-size: 0.83rem;
        color: var(--color-text-muted);
        line-height: 1.6;
    }

    /* FAQ */
    .faq-block {
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-lg);
        padding: var(--space-2xl);
        box-shadow: var(--shadow-sm);
    }

    .accordion-item {
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        margin-bottom: var(--space-sm);
        overflow: hidden;
        transition: all var(--transition-fast);
        background: var(--color-surface);
    }

    .accordion-item:hover {
        border-color: var(--color-accent);
    }

    .accordion-title {
        background: var(--color-surface);
        padding: var(--space-md) var(--space-lg);
        font-weight: 600;
        font-size: 1rem;
        color: var(--color-primary);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        transition: all var(--transition-fast);
        user-select: none;
    }

    .accordion-title:hover {
        color: var(--color-accent);
        background: var(--color-accent-soft);
    }

    .accordion-icon {
        font-size: 1.2rem;
        color: var(--color-accent);
        transition: transform var(--transition-base);
        flex-shrink: 0;
        margin-left: var(--space-sm);
    }

    .accordion-item.active .accordion-icon {
        transform: rotate(45deg);
    }

    .accordion-content {
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-slow);
    }

    .accordion-content-inner {
        padding: var(--space-md) var(--space-lg) var(--space-lg);
        color: var(--color-text-muted);
        line-height: 1.8;
        font-size: 0.95rem;
        border-top: 1px solid var(--color-border);
    }

    /* CTA */
    .cta-section {
        background: var(--color-primary);
        background-image: linear-gradient(135deg, #141414 0%, #1e1e1e 60%, #2a2a2a 100%);
        border-radius: var(--radius-lg);
        padding: var(--space-3xl) var(--space-2xl);
        text-align: center;
        color: #fff;
        margin-top: var(--space-2xl);
    }

    .cta-section h3 {
        font-size: 1.8rem;
        font-weight: 700;
        margin-bottom: var(--space-md);
        color: #fff;
        letter-spacing: -0.02em;
    }

    .cta-section p {
        color: rgba(255,255,255,0.75);
        font-size: 1.05rem;
        max-width: 600px;
        margin: 0 auto var(--space-xl);
        line-height: 1.8;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 0.95rem;
        font-weight: 600;
        padding: 12px 28px;
        border-radius: var(--radius-md);
        transition: all var(--transition-base);
        cursor: pointer;
        border: none;
        letter-spacing: 0.02em;
    }

    .btn-primary {
        background: var(--color-accent);
        color: #fff;
    }

    .btn-primary:hover {
        background: var(--color-accent-hover);
        color: #fff;
        transform: translateY(-1px);
        box-shadow: var(--shadow-lg);
    }

    .btn-outline {
        background: transparent;
        color: #fff;
        border: 2px solid rgba(255,255,255,0.4);
    }

    .btn-outline:hover {
        border-color: var(--color-accent);
        color: var(--color-accent);
        background: rgba(255,92,26,0.08);
    }

    .btn-outline-dark {
        background: transparent;
        color: var(--color-accent);
        border: 2px solid var(--color-accent);
    }

    .btn-outline-dark:hover {
        background: var(--color-accent);
        color: #fff;
        transform: translateY(-1px);
        box-shadow: var(--shadow-lg);
    }

    /* Footer */
    .site-footer {
        background: var(--color-primary);
        color: var(--color-footer-text);
        padding: var(--space-3xl) 0 var(--space-lg);
        margin-top: var(--space-section);
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr;
        gap: var(--space-3xl);
        margin-bottom: var(--space-2xl);
    }

    .footer-brand h4 {
        font-size: 1.4rem;
        font-weight: 700;
        color: #fff;
        margin-bottom: var(--space-md);
    }

    .footer-brand h4 span {
        color: var(--color-accent);
    }

    .footer-brand p {
        font-size: 0.9rem;
        line-height: 1.8;
        color: var(--color-footer-text);
    }

    .footer-col h5 {
        font-size: 1rem;
        font-weight: 600;
        color: #fff;
        margin-bottom: var(--space-md);
    }

    .footer-col ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .footer-col ul li {
        margin-bottom: var(--space-sm);
    }

    .footer-col ul li a {
        color: var(--color-footer-text);
        font-size: 0.9rem;
        transition: color var(--transition-fast);
    }

    .footer-col ul li a:hover {
        color: #fff;
    }

    .footer-bottom {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: var(--space-md);
        padding-top: var(--space-lg);
        border-top: 1px solid rgba(255,255,255,0.1);
        font-size: 0.8rem;
        color: var(--color-text-light);
    }

    .footer-bottom a {
        color: var(--color-text-light);
        transition: color var(--transition-fast);
    }

    .footer-bottom a:hover {
        color: #fff;
    }

    /* Responsive */
    @media (max-width: 1024px) {
        .nav-left,
        .nav-right {
            gap: var(--space-sm);
        }
        .nav-link {
            font-size: 0.82rem;
            padding: 5px 8px;
        }
        .logo-area {
            padding: 0 var(--space-md);
        }
        .logo-text {
            font-size: 1.35rem;
        }
        .process-steps {
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-xl);
        }
        .process-step:not(:last-child)::after {
            display: none;
        }
        .stats-strip {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (max-width: 768px) {
        .nav-left,
        .nav-right {
            display: none;
        }
        .mobile-toggle {
            display: block;
        }
        .header-inner {
            min-height: 60px;
        }
        .logo-area {
            flex: 1;
            text-align: center;
            padding: 0;
        }
        .logo-text {
            font-size: 1.3rem;
        }
        .inner-hero {
            padding: var(--space-2xl) 0;
            min-height: 240px;
        }
        .inner-hero-title {
            font-size: 1.9rem;
        }
        .inner-hero-desc {
            font-size: 0.98rem;
        }
        .section {
            padding-top: 48px;
            padding-bottom: 48px;
        }
        .section-title {
            font-size: 1.5rem;
        }
        .training-item {
            flex-direction: column;
            gap: var(--space-md);
        }
        .training-item-img {
            width: 100%;
            height: 160px;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: var(--space-xl);
        }
        .footer-bottom {
            flex-direction: column;
            align-items: flex-start;
            gap: var(--space-sm);
        }
        .cta-section {
            padding: var(--space-2xl) var(--space-lg);
        }
        .cta-section h3 {
            font-size: 1.4rem;
        }
        .cat-intro,
        .deep-content,
        .faq-block {
            padding: var(--space-lg);
        }
        .process-steps {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 520px) {
        .container {
            padding-left: var(--space-md);
            padding-right: var(--space-md);
        }
        .inner-hero-title {
            font-size: 1.55rem;
        }
        .section-title {
            font-size: 1.3rem;
        }
        .stats-strip {
            grid-template-columns: 1fr;
            gap: var(--space-sm);
        }
        .stat-block .stat-num {
            font-size: 1.6rem;
        }
        .training-item-title {
            font-size: 1.05rem;
        }
        .btn {
            padding: 10px 20px;
            font-size: 0.88rem;
        }
    }

/* roulang page: category6 */
:root {
            --color-primary: #141414;
            --color-primary-soft: #1e1e1e;
            --color-accent: #FF5C1A;
            --color-accent-hover: #e64d0e;
            --color-accent-soft: #fff0e8;
            --color-bg: #F6F6F0;
            --color-surface: #ffffff;
            --color-border: #E5E5E5;
            --color-text: #1a1a1a;
            --color-text-muted: #6B6B6B;
            --color-text-light: #9a9a9a;
            --color-footer-text: #c0c0c0;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-section: 80px;
            --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 16px;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--color-accent);
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--space-lg);
            padding-right: var(--space-lg);
        }

        .section {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 720px;
            margin-bottom: var(--space-xl);
            line-height: 1.7;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: var(--color-accent-soft);
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: var(--space-md);
        }

        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: var(--shadow-sm);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            position: relative;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            flex: 1;
        }

        .nav-right {
            justify-content: flex-end;
        }

        .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-muted);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-link:hover {
            color: var(--color-accent);
            background: var(--color-accent-soft);
        }

        .nav-link.active {
            color: var(--color-accent);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }

        .logo-area {
            flex-shrink: 0;
            padding: 0 var(--space-lg);
            text-align: center;
        }

        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-primary);
            white-space: nowrap;
            transition: color var(--transition-fast);
            cursor: pointer;
        }

        .logo-text:hover {
            color: var(--color-accent);
        }

        .logo-text .logo-b {
            color: var(--color-accent);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--color-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-toggle:hover {
            background: var(--color-accent-soft);
        }

        .mobile-menu {
            display: none;
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            padding: var(--space-md) 0;
            flex-direction: column;
            gap: var(--space-sm);
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu .nav-link {
            display: block;
            padding: 10px 16px;
            font-size: 1rem;
            border-radius: 0;
            border-bottom: 1px solid var(--color-border);
        }

        .mobile-menu .nav-link:last-child {
            border-bottom: none;
        }

        .mobile-menu .nav-link.active::after {
            display: none;
        }

        .breadcrumb-bar {
            background: var(--color-primary);
            padding: var(--space-md) 0;
            color: var(--color-text-light);
            font-size: 0.85rem;
        }

        .breadcrumb-bar a {
            color: var(--color-accent);
            transition: color var(--transition-fast);
        }

        .breadcrumb-bar a:hover {
            color: var(--color-accent-hover);
        }

        .category-hero {
            background: var(--color-primary);
            background-image: linear-gradient(135deg, rgba(20, 20, 20, 0.92) 0%, rgba(30, 30, 30, 0.85) 100%), url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            padding: var(--space-3xl) 0;
            position: relative;
            overflow: hidden;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--color-accent);
        }

        .category-hero .hero-content {
            max-width: 820px;
            position: relative;
            z-index: 2;
        }

        .category-hero .hero-tag {
            display: inline-block;
            background: rgba(255, 92, 26, 0.18);
            color: var(--color-accent);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 20px;
            border: 1px solid rgba(255, 92, 26, 0.3);
            margin-bottom: var(--space-md);
            letter-spacing: 0.05em;
        }

        .category-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.03em;
            line-height: 1.2;
            margin-bottom: var(--space-md);
        }

        .category-hero .hero-desc {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.8;
            max-width: 640px;
            margin-bottom: var(--space-lg);
        }

        .category-hero .hero-stats {
            display: flex;
            gap: var(--space-xl);
            flex-wrap: wrap;
        }

        .category-hero .hero-stat {
            display: flex;
            flex-direction: column;
        }

        .category-hero .hero-stat-value {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1.2;
        }

        .category-hero .hero-stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.55);
            margin-top: 2px;
        }

        .btn {
            display: inline-block;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all var(--transition-base);
            border: none;
            text-align: center;
            line-height: 1.5;
        }

        .btn-accent {
            background: var(--color-accent);
            color: #ffffff;
            box-shadow: 0 4px 12px rgba(255, 92, 26, 0.3);
        }

        .btn-accent:hover {
            background: var(--color-accent-hover);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255, 92, 26, 0.4);
        }

        .btn-outline {
            background: transparent;
            color: var(--color-accent);
            border: 2px solid var(--color-accent);
        }

        .btn-outline:hover {
            background: var(--color-accent);
            color: #ffffff;
            transform: translateY(-2px);
        }

        .review-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }

        .review-row {
            display: flex;
            background: var(--color-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            position: relative;
        }

        .review-row:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--color-accent);
        }

        .review-thumb {
            flex-shrink: 0;
            width: 220px;
            min-height: 160px;
            position: relative;
            overflow: hidden;
            background: var(--color-primary-soft);
        }

        .review-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .review-row:hover .review-thumb img {
            transform: scale(1.05);
        }

        .review-body {
            flex: 1;
            padding: var(--space-lg);
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: var(--space-sm);
        }

        .review-meta {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            font-size: 0.8rem;
            color: var(--color-text-light);
            flex-wrap: wrap;
        }

        .review-badge {
            display: inline-block;
            background: var(--color-accent-soft);
            color: var(--color-accent);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 12px;
            letter-spacing: 0.03em;
        }

        .review-date {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .review-date i {
            font-size: 0.75rem;
        }

        .review-title {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.4;
            margin: 0;
        }

        .review-title a:hover {
            color: var(--color-accent);
        }

        .review-excerpt {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .review-action {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: auto;
        }

        .review-score {
            display: flex;
            align-items: center;
            gap: 4px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-accent);
        }

        .review-score i {
            color: var(--color-accent);
            font-size: 0.85rem;
        }

        .review-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition-fast);
        }

        .review-link i {
            font-size: 0.75rem;
            transition: transform var(--transition-fast);
        }

        .review-link:hover {
            color: var(--color-accent-hover);
        }

        .review-link:hover i {
            transform: translateX(4px);
        }

        .test-criteria {
            background: var(--color-primary);
            padding: var(--space-section) 0;
            color: #ffffff;
        }

        .test-criteria .section-title {
            color: #ffffff;
        }

        .test-criteria .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }

        .criteria-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
            margin-top: var(--space-xl);
        }

        .criteria-card {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-md);
            padding: var(--space-xl) var(--space-lg);
            text-align: center;
            transition: all var(--transition-base);
        }

        .criteria-card:hover {
            background: rgba(255, 255, 255, 0.09);
            border-color: var(--color-accent);
            transform: translateY(-4px);
        }

        .criteria-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(255, 92, 26, 0.18);
            color: var(--color-accent);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto var(--space-md);
            font-size: 1.4rem;
        }

        .criteria-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: var(--space-sm);
        }

        .criteria-card p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.6);
            margin: 0;
            line-height: 1.6;
        }

        .top-picks {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            padding: var(--space-xl);
            box-shadow: var(--shadow-md);
        }

        .top-picks-header {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            margin-bottom: var(--space-lg);
            flex-wrap: wrap;
        }

        .top-picks-header h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-primary);
            margin: 0;
        }

        .top-picks-header .top-tag {
            display: inline-block;
            background: var(--color-accent);
            color: #ffffff;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 12px;
            letter-spacing: 0.05em;
        }

        .top-picks-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }

        .top-pick-item {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            padding: var(--space-md);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            background: var(--color-bg);
            transition: all var(--transition-base);
        }

        .top-pick-item:hover {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .top-pick-rank {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--color-accent);
            flex-shrink: 0;
            width: 40px;
            text-align: center;
        }

        .top-pick-info h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--color-primary);
            margin: 0 0 2px;
            line-height: 1.4;
        }

        .top-pick-info p {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            margin: 0;
        }

        .faq-section {
            background: var(--color-surface);
        }

        .accordion {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--color-surface);
            margin-bottom: 0;
        }

        .accordion-item {
            border-bottom: 1px solid var(--color-border);
            background: var(--color-surface);
        }

        .accordion-item:last-child {
            border-bottom: none;
        }

        .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-lg);
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--color-primary);
            transition: all var(--transition-fast);
            background: var(--color-surface);
            border: none;
            width: 100%;
            text-align: left;
            gap: var(--space-md);
        }

        .accordion-title:hover {
            color: var(--color-accent);
            background: var(--color-accent-soft);
        }

        .accordion-title .accordion-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            font-size: 1rem;
            color: var(--color-text-muted);
            transition: all var(--transition-base);
            font-weight: 400;
        }

        .accordion-title.is-active {
            color: var(--color-accent);
        }

        .accordion-title.is-active .accordion-icon {
            background: var(--color-accent);
            color: #ffffff;
            border-color: var(--color-accent);
            transform: rotate(45deg);
        }

        .accordion-content {
            display: none;
            padding: 0 var(--space-lg) var(--space-lg);
            color: var(--color-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .accordion-content.is-active {
            display: block;
        }

        .cta-section {
            background: var(--color-primary);
            background-image: linear-gradient(135deg, rgba(20, 20, 20, 0.95) 0%, rgba(40, 40, 40, 0.9) 100%), url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            padding: var(--space-3xl) 0;
            text-align: center;
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--color-accent);
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.02em;
            margin-bottom: var(--space-md);
        }

        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto var(--space-xl);
            line-height: 1.8;
        }

        .cta-section .btn {
            margin: 0 var(--space-sm);
        }

        .site-footer {
            background: var(--color-primary);
            color: var(--color-footer-text);
            padding: var(--space-3xl) 0 var(--space-xl);
            border-top: 4px solid var(--color-accent);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: var(--space-2xl);
            margin-bottom: var(--space-2xl);
        }

        .footer-brand h4 {
            font-size: 1.4rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: var(--space-md);
            letter-spacing: -0.02em;
        }

        .footer-brand h4 span {
            color: var(--color-accent);
        }

        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: var(--color-footer-text);
            max-width: 400px;
        }

        .footer-col h5 {
            font-size: 1rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: var(--space-md);
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: var(--space-sm);
        }

        .footer-col ul li a {
            font-size: 0.9rem;
            color: var(--color-footer-text);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-md);
            padding-top: var(--space-lg);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.45);
            align-items: center;
            justify-content: space-between;
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
            transition: color var(--transition-fast);
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        @media (max-width: 1024px) {
            .criteria-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--space-md);
            }
            .top-picks-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .review-thumb {
                width: 180px;
                min-height: 140px;
            }
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-xl);
            }
        }

        @media (max-width: 768px) {
            .nav-left,
            .nav-right {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .header-inner {
                justify-content: space-between;
                gap: var(--space-md);
            }
            .logo-area {
                padding: 0;
                flex: 1;
                text-align: center;
            }
            .logo-text {
                font-size: 1.3rem;
            }
            .category-hero h1 {
                font-size: 2rem;
            }
            .category-hero .hero-desc {
                font-size: 1rem;
            }
            .review-row {
                flex-direction: column;
            }
            .review-thumb {
                width: 100%;
                min-height: 180px;
            }
            .review-body {
                padding: var(--space-md);
            }
            .review-title {
                font-size: 1.05rem;
            }
            .top-picks-grid {
                grid-template-columns: 1fr;
            }
            .criteria-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
            .section-title {
                font-size: 1.6rem;
            }
            .section {
                padding-top: var(--space-2xl);
                padding-bottom: var(--space-2xl);
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
            .category-hero {
                padding: var(--space-2xl) 0;
            }
            .category-hero h1 {
                font-size: 1.6rem;
            }
            .category-hero .hero-stats {
                gap: var(--space-md);
            }
            .category-hero .hero-stat-value {
                font-size: 1.4rem;
            }
            .review-thumb {
                min-height: 150px;
            }
            .review-meta {
                gap: var(--space-sm);
            }
            .btn {
                padding: 10px 18px;
                font-size: 0.85rem;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--space-sm);
            }
        }