/* roulang page: index */
:root {
            --primary: #1e2a4a;
            --primary-light: #2a3d6b;
            --primary-dark: #0f1a2e;
            --accent: #4a6cf7;
            --accent-hover: #3a5de7;
            --accent-light: #e8edfe;
            --accent-glow: rgba(74, 108, 247, 0.15);
            --cta: #f97316;
            --cta-hover: #e8650e;
            --cta-glow: rgba(249, 115, 22, 0.2);
            --success: #10b981;
            --warning: #f59e0b;
            --bg: #f8fafc;
            --bg-alt: #ffffff;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-secondary: #64748b;
            --text-light: #94a3b8;
            --text-inverse: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.08);
            --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-height: 68px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
        }

        *,
        *::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(--bg);
            color: var(--text);
            line-height: 1.7;
            margin: 0;
            padding: 0;
            padding-top: var(--nav-height);
        }

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

        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
        }

        button,
        input,
        textarea {
            font-family: inherit;
        }

        ::selection {
            background: var(--accent);
            color: #fff;
        }

        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1080;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.72);
            backdrop-filter: blur(18px) saturate(1.6);
            -webkit-backdrop-filter: blur(18px) saturate(1.6);
            border-bottom: 1px solid rgba(255, 255, 255, 0.18);
            box-shadow: 0 2px 32px rgba(0, 0, 0, 0.04);
            transition: var(--transition);
            padding: 0;
        }

        .site-header .container {
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            text-decoration: none;
            flex-shrink: 0;
        }
        .nav-brand i {
            font-size: 1.6rem;
            color: var(--accent);
        }
        .nav-brand:hover {
            color: var(--primary);
        }

        .nav-brand span {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-menu .nav-item {
            margin: 0;
            padding: 0;
        }

        .nav-menu .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: var(--transition);
            white-space: nowrap;
            background: transparent;
            border: none;
        }
        .nav-menu .nav-link:hover {
            color: var(--primary);
            background: var(--accent-light);
        }
        .nav-menu .nav-link.active {
            color: #fff;
            background: var(--accent);
            box-shadow: 0 4px 12px var(--accent-glow);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 22px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            background: var(--cta);
            border: none;
            transition: var(--transition);
            text-decoration: none;
            white-space: nowrap;
            box-shadow: 0 4px 16px var(--cta-glow);
        }
        .nav-cta:hover {
            background: var(--cta-hover);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 8px 24px var(--cta-glow);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--accent-light);
        }

        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.3);
            z-index: 1070;
            backdrop-filter: blur(4px);
        }
        .nav-overlay.open {
            display: block;
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                position: fixed;
                top: 0;
                right: -320px;
                width: 300px;
                height: 100vh;
                flex-direction: column;
                align-items: stretch;
                gap: 2px;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                padding: 80px 24px 32px;
                box-shadow: -8px 0 40px rgba(0, 0, 0, 0.08);
                transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                z-index: 1090;
                overflow-y: auto;
                border-left: 1px solid var(--border);
            }
            .nav-menu.open {
                right: 0;
            }
            .nav-menu .nav-link {
                padding: 14px 20px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .nav-cta {
                margin-top: 12px;
                justify-content: center;
                width: 100%;
                padding: 14px 20px;
            }
            .nav-menu .nav-item {
                width: 100%;
            }
        }

        @media (max-width: 520px) {
            .nav-brand {
                font-size: 1.05rem;
            }
            .nav-brand i {
                font-size: 1.3rem;
            }
            .nav-menu {
                width: 100%;
                right: -110%;
                padding: 72px 16px 24px;
            }
            .nav-cta {
                padding: 12px 18px;
                font-size: 0.85rem;
            }
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            padding: 100px 0 120px;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-blend-mode: overlay;
            overflow: hidden;
            min-height: 86vh;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 46, 0.88) 0%, rgba(30, 42, 74, 0.72) 50%, rgba(74, 108, 247, 0.32) 100%);
            z-index: 1;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--bg) 0%, transparent 100%);
            z-index: 2;
        }
        .hero-section .container {
            position: relative;
            z-index: 3;
        }
        .hero-content {
            max-width: 720px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.10);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.12);
            padding: 6px 18px 6px 12px;
            border-radius: 100px;
            font-size: 0.85rem;
            color: var(--text-inverse);
            margin-bottom: 24px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        }
        .hero-badge i {
            color: var(--accent);
            font-size: 1rem;
        }
        .hero-badge span {
            opacity: 0.8;
        }
        .hero-title {
            font-size: clamp(2.2rem, 6vw, 4.2rem);
            font-weight: 800;
            line-height: 1.12;
            color: #fff;
            margin-bottom: 20px;
            letter-spacing: -0.03em;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        }
        .hero-title .highlight {
            background: linear-gradient(135deg, var(--accent), #8b9cf7);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: clamp(1rem, 2vw, 1.2rem);
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.78);
            margin-bottom: 36px;
            max-width: 580px;
            text-shadow: 0 1px 8px rgba(0, 0, 0, 0.12);
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
        }
        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 36px;
            border-radius: 100px;
            font-size: 1.05rem;
            font-weight: 700;
            color: #fff;
            background: var(--cta);
            border: none;
            transition: var(--transition);
            text-decoration: none;
            box-shadow: 0 8px 32px var(--cta-glow);
        }
        .btn-hero-primary:hover {
            background: var(--cta-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 12px 40px var(--cta-glow);
        }
        .btn-hero-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 16px 32px;
            border-radius: 100px;
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            background: rgba(255, 255, 255, 0.10);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: var(--transition);
            text-decoration: none;
        }
        .btn-hero-secondary:hover {
            background: rgba(255, 255, 255, 0.18);
            color: #fff;
            transform: translateY(-2px);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 32px 48px;
            margin-top: 52px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.10);
        }
        .hero-stat {
            display: flex;
            flex-direction: column;
        }
        .hero-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .hero-stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.55);
            margin-top: 2px;
        }

        @media (max-width: 768px) {
            .hero-section {
                padding: 70px 0 80px;
                min-height: auto;
            }
            .hero-stats {
                gap: 24px 32px;
                margin-top: 36px;
                padding-top: 24px;
            }
            .hero-stat-number {
                font-size: 1.6rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-hero-primary,
            .btn-hero-secondary {
                justify-content: center;
                padding: 14px 28px;
            }
        }
        @media (max-width: 520px) {
            .hero-section {
                padding: 50px 0 60px;
            }
            .hero-badge {
                font-size: 0.75rem;
                padding: 4px 14px 4px 10px;
            }
        }

        /* ===== Section Common ===== */
        .section-padding {
            padding: 90px 0;
        }
        .section-padding-sm {
            padding: 60px 0;
        }
        .section-bg-alt {
            background: var(--bg-alt);
        }
        .section-bg-dark {
            background: var(--bg-dark);
            color: var(--text-inverse);
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--accent);
            background: var(--accent-light);
            padding: 4px 16px;
            border-radius: 100px;
            margin-bottom: 12px;
        }
        .section-label i {
            font-size: 0.75rem;
        }

        .section-title {
            font-size: clamp(1.6rem, 3.6vw, 2.6rem);
            font-weight: 800;
            line-height: 1.25;
            color: var(--primary);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .section-title-center {
            text-align: center;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.7;
        }
        .section-subtitle-center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-header-center {
            text-align: center;
            margin-bottom: 52px;
        }

        .section-bg-dark .section-title {
            color: #fff;
        }
        .section-bg-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }
        .section-bg-dark .section-label {
            background: rgba(255, 255, 255, 0.10);
            color: var(--accent);
        }

        @media (max-width: 768px) {
            .section-padding {
                padding: 56px 0;
            }
            .section-padding-sm {
                padding: 40px 0;
            }
            .section-header-center {
                margin-bottom: 36px;
            }
        }

        /* ===== Card ===== */
        .card-custom {
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            height: 100%;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card-custom .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--accent-light);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 18px;
        }
        .card-custom .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .card-custom .card-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0;
        }
        .card-custom .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent);
            margin-top: 14px;
        }
        .card-custom .card-link:hover {
            gap: 10px;
        }

        .card-cover {
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card-cover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card-cover .cover-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .card-cover .cover-body {
            padding: 22px 20px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-cover .cover-tag {
            display: inline-block;
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--accent);
            background: var(--accent-light);
            padding: 2px 12px;
            border-radius: 100px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .card-cover .cover-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card-cover .cover-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 14px;
            flex: 1;
        }
        .card-cover .cover-meta {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* ===== Category Cards ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            min-height: 220px;
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .category-card .cat-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .category-card .cat-body {
            padding: 22px 24px 26px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .cat-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--accent);
            background: var(--accent-light);
            padding: 3px 14px;
            border-radius: 100px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .category-card .cat-title {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .category-card .cat-desc {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 16px;
            flex: 1;
        }
        .category-card .cat-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent);
            padding: 8px 20px;
            border-radius: 100px;
            background: var(--accent-light);
            align-self: flex-start;
            transition: var(--transition);
            border: none;
            text-decoration: none;
        }
        .category-card .cat-btn:hover {
            background: var(--accent);
            color: #fff;
            gap: 10px;
            box-shadow: 0 4px 16px var(--accent-glow);
        }

        @media (max-width: 768px) {
            .category-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .category-card .cat-img {
                height: 160px;
            }
        }
        @media (max-width: 520px) {
            .category-card .cat-body {
                padding: 16px 18px 20px;
            }
        }

        /* ===== Content List (CMS) ===== */
        .content-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
        }
        .content-item {
            display: flex;
            align-items: flex-start;
            gap: 18px;
            padding: 20px 24px;
            background: var(--bg-alt);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            text-decoration: none;
            box-shadow: var(--shadow-sm);
        }
        .content-item:hover {
            transform: translateX(4px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
            background: #fff;
        }
        .content-item .ci-index {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--accent-light);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
        }
        .content-item .ci-body {
            flex: 1;
            min-width: 0;
        }
        .content-item .ci-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 4px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .content-item .ci-excerpt {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .content-item .ci-meta {
            font-size: 0.78rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 6px;
        }
        .content-item .ci-meta .badge {
            font-size: 0.7rem;
            font-weight: 500;
            background: var(--accent-light);
            color: var(--accent);
            padding: 2px 10px;
            border-radius: 100px;
        }

        @media (max-width: 768px) {
            .content-item {
                padding: 16px 18px;
                gap: 14px;
                flex-wrap: wrap;
            }
            .content-item .ci-index {
                width: 30px;
                height: 30px;
                font-size: 0.75rem;
            }
        }

        /* ===== Steps / Timeline ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 32px 24px 28px;
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .step-card::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px var(--accent-glow);
        }
        .step-card .step-icon {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 14px;
            margin-top: 8px;
        }
        .step-card .step-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .step-card .step-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0;
        }

        @media (max-width: 992px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .step-card {
                padding: 28px 18px 24px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            overflow: hidden;
        }
        .faq-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--accent);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 22px 20px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-item .collapse:not(.show)+.faq-answer {
            display: none;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 46, 0.90) 0%, rgba(30, 42, 74, 0.70) 100%);
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-box {
            text-align: center;
            padding: 60px 20px;
        }
        .cta-box .cta-title {
            font-size: clamp(1.6rem, 3.2vw, 2.4rem);
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-box .cta-desc {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .cta-box .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 18px 44px;
            border-radius: 100px;
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            background: var(--cta);
            border: none;
            transition: var(--transition);
            text-decoration: none;
            box-shadow: 0 8px 32px var(--cta-glow);
        }
        .cta-box .cta-btn:hover {
            background: var(--cta-hover);
            transform: translateY(-2px);
            box-shadow: 0 12px 44px var(--cta-glow);
            color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-inverse);
            padding: 56px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }
        .footer-brand i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .footer-desc {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-heading {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-links a:hover {
            color: #fff;
            transform: translateX(3px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.45);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Misc ===== */
        .divider {
            width: 60px;
            height: 4px;
            border-radius: 4px;
            background: linear-gradient(90deg, var(--accent), var(--cta));
            margin: 0 auto 16px;
        }
        .divider-left {
            margin-left: 0;
            margin-right: auto;
        }

        .text-accent {
            color: var(--accent);
        }
        .text-cta {
            color: var(--cta);
        }
        .bg-accent-soft {
            background: var(--accent-light);
        }

        .btn-outline-accent {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 100px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--accent);
            background: transparent;
            border: 2px solid var(--accent);
            transition: var(--transition);
            text-decoration: none;
        }
        .btn-outline-accent:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px var(--accent-glow);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 100px;
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            background: var(--accent);
            border: none;
            transition: var(--transition);
            text-decoration: none;
            box-shadow: 0 4px 16px var(--accent-glow);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px var(--accent-glow);
            color: #fff;
        }

        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            background: var(--bg-alt);
            border-radius: var(--radius-sm);
            border: 1px dashed var(--border);
        }
        .empty-state i {
            font-size: 2.4rem;
            color: var(--text-light);
            margin-bottom: 12px;
            display: block;
        }

        /* ===== Responsive Extra ===== */
        @media (max-width: 1024px) {
            .container {
                padding-left: 20px;
                padding-right: 20px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 14px;
                padding-right: 14px;
            }
            body {
                padding-top: 60px;
            }
            :root {
                --nav-height: 60px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
            }
        }

/* roulang page: article */
:root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --secondary: #0ea5e9;
            --accent: #10b981;
            --warning: #f59e0b;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-gray: #f1f5f9;
            --text: #1e293b;
            --text-light: #64748b;
            --text-lighter: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
            --shadow-hover: 0 8px 32px rgba(37,99,235,0.15);
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.7; font-size: 1rem; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }
        .container { max-width: 1200px; padding-left: 20px; padding-right: 20px; }

        /* Header & Nav */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1050;
            background: rgba(255,255,255,0.85);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid rgba(226,232,240,0.5);
            transition: var(--transition);
            padding: 0;
        }
        .site-header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; }
        .nav-brand { display: flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 700; color: var(--text); text-decoration: none; }
        .nav-brand i { font-size: 1.6rem; color: var(--primary); background: linear-gradient(135deg,var(--primary),var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-brand span { background: linear-gradient(135deg,var(--primary),var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-brand:hover { opacity: 0.9; }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.6rem; color: var(--text); cursor: pointer; padding: 6px 10px; border-radius: var(--radius-sm); transition: var(--transition); }
        .nav-toggle:hover { background: var(--bg-gray); }
        .nav-menu { display: flex; align-items: center; gap: 6px; list-style: none; margin: 0; padding: 0; }
        .nav-item { position: relative; }
        .nav-link { display: block; padding: 8px 16px; color: var(--text-light); font-weight: 500; font-size: 0.94rem; border-radius: 50px; transition: var(--transition); text-decoration: none; }
        .nav-link:hover { color: var(--primary); background: rgba(37,99,235,0.06); }
        .nav-link.active { color: var(--text-white); background: var(--primary); box-shadow: 0 4px 12px rgba(37,99,235,0.3); }
        .nav-link.active:hover { color: var(--text-white); background: var(--primary-dark); }
        .nav-cta { display: inline-flex; align-items: center; gap: 6px; padding: 8px 22px; color: var(--text-white); background: linear-gradient(135deg,var(--primary),var(--primary-dark)); border-radius: 50px; font-weight: 600; font-size: 0.94rem; box-shadow: 0 4px 16px rgba(37,99,235,0.3); transition: var(--transition); text-decoration: none; }
        .nav-cta i { font-size: 1.1rem; }
        .nav-cta:hover { color: var(--text-white); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(37,99,235,0.35); }

        /* Hero Article */
        .article-hero {
            position: relative; margin-top: 68px; padding: 80px 0 100px;
            background: linear-gradient(135deg, rgba(15,23,42,0.82), rgba(30,58,138,0.78)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            min-height: 380px; display: flex; align-items: center;
        }
        .article-hero .container { position: relative; z-index: 2; }
        .article-hero .article-category { display: inline-block; padding: 4px 16px; background: rgba(255,255,255,0.2); backdrop-filter: blur(4px); border-radius: 50px; color: #fff; font-size: 0.82rem; font-weight: 500; letter-spacing: 0.3px; margin-bottom: 16px; }
        .article-hero h1 { color: #fff; font-size: 2.6rem; font-weight: 800; line-height: 1.25; max-width: 840px; margin-bottom: 20px; text-shadow: 0 2px 20px rgba(0,0,0,0.2); }
        .article-hero .article-meta { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; color: rgba(255,255,255,0.8); font-size: 0.92rem; }
        .article-hero .article-meta i { margin-right: 5px; }
        .article-hero .article-meta span { display: inline-flex; align-items: center; }
        .article-hero .article-meta .badge { background: rgba(255,255,255,0.18); backdrop-filter: blur(4px); color: #fff; padding: 4px 14px; border-radius: 50px; font-weight: 500; font-size: 0.82rem; }

        /* Breadcrumb */
        .breadcrumb-wrap { background: var(--bg-white); border-bottom: 1px solid var(--border); padding: 14px 0; }
        .breadcrumb-wrap .breadcrumb { margin: 0; background: none; padding: 0; }
        .breadcrumb-wrap .breadcrumb-item { font-size: 0.88rem; color: var(--text-light); }
        .breadcrumb-wrap .breadcrumb-item a { color: var(--primary); }
        .breadcrumb-wrap .breadcrumb-item.active { color: var(--text); font-weight: 500; }

        /* Article Content */
        .article-main { padding: 50px 0 60px; }
        .article-content-wrap { background: var(--bg-white); border-radius: var(--radius); box-shadow: var(--shadow); padding: 44px 48px; }
        .article-content { font-size: 1.05rem; line-height: 1.9; color: var(--text); }
        .article-content h2 { font-size: 1.6rem; font-weight: 700; margin-top: 36px; margin-bottom: 16px; color: var(--text); }
        .article-content h3 { font-size: 1.25rem; font-weight: 600; margin-top: 28px; margin-bottom: 12px; color: var(--text); }
        .article-content p { margin-bottom: 18px; }
        .article-content ul, .article-content ol { margin-bottom: 18px; padding-left: 24px; }
        .article-content li { margin-bottom: 6px; }
        .article-content img { border-radius: var(--radius-sm); margin: 24px 0; box-shadow: var(--shadow); }
        .article-content blockquote { border-left: 4px solid var(--primary); background: var(--bg-gray); padding: 16px 24px; margin: 24px 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-light); font-style: italic; }
        .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
        .article-content a:hover { color: var(--primary-dark); }

        /* Article Footer */
        .article-footer { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
        .article-tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .article-tags .tag { display: inline-block; padding: 4px 16px; background: var(--bg-gray); border-radius: 50px; font-size: 0.82rem; color: var(--text-light); transition: var(--transition); text-decoration: none; }
        .article-tags .tag:hover { background: var(--primary); color: #fff; }
        .article-share { display: flex; gap: 10px; align-items: center; }
        .article-share span { font-size: 0.88rem; color: var(--text-light); }
        .article-share a { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: var(--bg-gray); color: var(--text-light); transition: var(--transition); font-size: 1rem; }
        .article-share a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        /* Related */
        .related-section { padding: 60px 0 70px; background: var(--bg); }
        .related-section .section-title { font-size: 1.8rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
        .related-section .section-sub { color: var(--text-light); margin-bottom: 36px; font-size: 1rem; }
        .related-card { background: var(--bg-white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); height: 100%; display: flex; flex-direction: column; }
        .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
        .related-card .card-img { width: 100%; height: 200px; object-fit: cover; border-radius: 0; }
        .related-card .card-body { padding: 20px 22px 24px; flex: 1; display: flex; flex-direction: column; }
        .related-card .card-body .badge { align-self: flex-start; margin-bottom: 10px; background: var(--primary); font-weight: 500; font-size: 0.75rem; padding: 4px 12px; border-radius: 50px; }
        .related-card .card-body h5 { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; line-height: 1.4; }
        .related-card .card-body h5 a { color: var(--text); text-decoration: none; }
        .related-card .card-body h5 a:hover { color: var(--primary); }
        .related-card .card-body p { color: var(--text-light); font-size: 0.9rem; margin-bottom: 12px; flex: 1; }
        .related-card .card-body .card-meta { font-size: 0.82rem; color: var(--text-lighter); display: flex; justify-content: space-between; }

        /* CTA */
        .cta-section { padding: 70px 0; background: linear-gradient(135deg, var(--bg-dark) 0%, #1e293b 100%); position: relative; overflow: hidden; }
        .cta-section::before { content: ''; position: absolute; top: -50%; right: -20%; width: 500px; height: 500px; background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%); border-radius: 50%; }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { color: #fff; font-size: 2rem; font-weight: 700; margin-bottom: 14px; }
        .cta-section p { color: rgba(255,255,255,0.7); font-size: 1.05rem; max-width: 640px; margin: 0 auto 28px; }
        .cta-section .btn-cta { display: inline-flex; align-items: center; gap: 10px; padding: 14px 40px; background: linear-gradient(135deg,var(--primary),var(--primary-dark)); color: #fff; border-radius: 50px; font-weight: 600; font-size: 1.05rem; box-shadow: 0 8px 32px rgba(37,99,235,0.35); transition: var(--transition); border: none; text-decoration: none; }
        .cta-section .btn-cta:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(37,99,235,0.45); color: #fff; }

        /* Footer */
        .site-footer { background: var(--bg-dark); color: rgba(255,255,255,0.7); padding: 60px 0 30px; }
        .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand { display: flex; align-items: center; gap: 10px; font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
        .footer-brand i { font-size: 1.5rem; color: var(--primary); background: linear-gradient(135deg,var(--primary),var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .footer-brand span { background: linear-gradient(135deg,var(--primary),var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .footer-desc { font-size: 0.92rem; line-height: 1.7; color: rgba(255,255,255,0.55); max-width: 320px; }
        .footer-heading { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 18px; letter-spacing: 0.3px; }
        .footer-links { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
        .footer-links a { color: rgba(255,255,255,0.55); font-size: 0.9rem; transition: var(--transition); text-decoration: none; }
        .footer-links a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: rgba(255,255,255,0.4); }
        .footer-bottom a { color: rgba(255,255,255,0.5); text-decoration: none; }
        .footer-bottom a:hover { color: var(--primary-light); }

        /* Not Found */
        .not-found-wrap { text-align: center; padding: 60px 20px; }
        .not-found-wrap .icon { font-size: 4rem; color: var(--text-lighter); margin-bottom: 20px; }
        .not-found-wrap h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 12px; }
        .not-found-wrap p { color: var(--text-light); margin-bottom: 24px; }
        .not-found-wrap .btn-back { display: inline-flex; align-items: center; gap: 8px; padding: 10px 28px; background: var(--primary); color: #fff; border-radius: 50px; font-weight: 500; transition: var(--transition); text-decoration: none; }
        .not-found-wrap .btn-back:hover { background: var(--primary-dark); color: #fff; }

        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            .nav-toggle { display: block; }
            .nav-menu { display: none; position: absolute; top: 68px; left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(16px); flex-direction: column; padding: 16px 20px; gap: 4px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg); border-radius: 0 0 var(--radius) var(--radius); }
            .nav-menu.open { display: flex; }
            .nav-link { padding: 12px 16px; border-radius: var(--radius-sm); }
            .nav-cta { margin-top: 8px; justify-content: center; }
            .article-hero { padding: 60px 0 70px; min-height: 300px; }
            .article-hero h1 { font-size: 1.8rem; }
            .article-content-wrap { padding: 28px 24px; }
            .article-content { font-size: 1rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
            .related-card .card-img { height: 180px; }
        }
        @media (max-width: 520px) {
            .site-header .container { height: 60px; }
            .nav-brand { font-size: 1.15rem; }
            .nav-brand i { font-size: 1.3rem; }
            .article-hero { margin-top: 60px; padding: 40px 0 50px; min-height: 240px; }
            .article-hero h1 { font-size: 1.4rem; }
            .article-hero .article-meta { gap: 10px; font-size: 0.8rem; flex-wrap: wrap; }
            .article-content-wrap { padding: 20px 16px; border-radius: var(--radius-sm); }
            .article-content h2 { font-size: 1.3rem; }
            .article-content h3 { font-size: 1.1rem; }
            .cta-section h2 { font-size: 1.5rem; }
            .cta-section .btn-cta { padding: 12px 28px; font-size: 0.95rem; }
            .related-section .section-title { font-size: 1.4rem; }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #f1f5f9;
            --text-primary: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --text-on-dark: #f1f5f9;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10), 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 9999px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== Base Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }

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

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-primary);
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 0.5em;
        }

        p {
            margin-bottom: 1rem;
        }

        /* ===== Utility ===== */
        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .section-pad {
            padding: 80px 0;
        }

        .section-pad-sm {
            padding: 48px 0;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
        }

        .section-subtitle {
            font-size: 1.125rem;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto 3rem auto;
            text-align: center;
            line-height: 1.6;
        }

        .text-center {
            text-align: center;
        }

        .mb-0 {
            margin-bottom: 0;
        }

        .mb-1 {
            margin-bottom: 0.5rem;
        }

        .mb-2 {
            margin-bottom: 1rem;
        }

        .mb-3 {
            margin-bottom: 1.5rem;
        }

        .mb-4 {
            margin-bottom: 2rem;
        }

        .mb-5 {
            margin-bottom: 3rem;
        }

        .mt-2 {
            margin-top: 1rem;
        }

        .mt-3 {
            margin-top: 1.5rem;
        }

        .mt-4 {
            margin-top: 2rem;
        }

        .mt-5 {
            margin-top: 3rem;
        }

        .gap-2 {
            gap: 0.75rem;
        }

        .gap-3 {
            gap: 1.25rem;
        }

        .gap-4 {
            gap: 2rem;
        }

        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

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

        /* ===== Header & Navigation (悬浮胶囊导航) ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.82);
            backdrop-filter: blur(18px) saturate(1.4);
            -webkit-backdrop-filter: blur(18px) saturate(1.4);
            border-bottom: 1px solid rgba(226, 232, 240, 0.5);
            transition: background var(--transition), box-shadow var(--transition);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--container-max);
        }

        .nav-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            text-decoration: none;
            letter-spacing: -0.03em;
        }
        .nav-brand i {
            font-size: 1.8rem;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-brand span {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-brand:hover {
            color: var(--primary);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--bg-section-alt);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 6px;
            margin: 0;
            padding: 0;
            list-style: none;
        }

        .nav-item {
            position: relative;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-body);
            border-radius: var(--radius-full);
            transition: background var(--transition), color var(--transition);
            text-decoration: none;
        }
        .nav-link:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav-link.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.30);
        }
        .nav-link.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 22px;
            font-size: 0.925rem;
            font-weight: 600;
            color: #fff;
            background: var(--primary-gradient);
            border-radius: var(--radius-full);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.30);
            transition: transform var(--transition), box-shadow var(--transition);
            text-decoration: none;
        }
        .nav-cta i {
            font-size: 1.1em;
        }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.40);
            color: #fff;
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.25) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 30%, rgba(124, 58, 237, 0.20) 0%, transparent 60%);
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 0.5rem;
            letter-spacing: -0.02em;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.30);
        }
        .page-banner p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.80);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
            text-shadow: 0 1px 10px rgba(0, 0, 0, 0.25);
        }
        .page-banner .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 6px 18px;
            border-radius: var(--radius-full);
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 1.25rem;
        }
        .page-banner .banner-badge i {
            color: var(--accent);
        }

        /* ===== Cards ===== */
        .card-custom {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
            overflow: hidden;
            height: 100%;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .card-custom .card-body {
            padding: 1.5rem;
        }
        .card-custom .card-img-top {
            border-radius: var(--radius-md) var(--radius-md) 0 0;
            object-fit: cover;
            height: 200px;
            width: 100%;
        }
        .card-custom .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .card-custom .card-text {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        .card-custom .card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
            margin-bottom: 0.75rem;
        }

        /* ===== Buttons ===== */
        .btn-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            font-weight: 600;
            font-size: 1rem;
            border-radius: var(--radius-full);
            border: none;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
            text-decoration: none;
        }
        .btn-custom-primary {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.30);
        }
        .btn-custom-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(37, 99, 235, 0.40);
            color: #fff;
        }
        .btn-custom-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-custom-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
        }
        .btn-custom-accent {
            background: linear-gradient(135deg, #f59e0b, #d97706);
            color: #fff;
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
        }
        .btn-custom-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.45);
            color: #fff;
        }
        .btn-custom-sm {
            padding: 8px 20px;
            font-size: 0.875rem;
        }
        .btn-custom-lg {
            padding: 16px 40px;
            font-size: 1.125rem;
        }

        /* ===== Badge / Tag ===== */
        .badge-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
            border: 1px solid rgba(37, 99, 235, 0.15);
        }
        .badge-tag-accent {
            background: var(--accent-light);
            color: var(--accent-dark);
            border-color: rgba(245, 158, 11, 0.20);
        }
        .badge-tag-success {
            background: #dcfce7;
            color: #16a34a;
            border-color: rgba(22, 163, 74, 0.15);
        }

        /* ===== Stats ===== */
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
            letter-spacing: -0.02em;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* ===== Step / Timeline ===== */
        .step-card {
            display: flex;
            gap: 1.25rem;
            padding: 1.5rem;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .step-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .step-number {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-full);
            background: var(--primary-gradient);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
        }
        .step-content {
            flex: 1;
        }
        .step-content h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 0.3rem;
        }
        .step-content p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            background: var(--bg-card);
            margin-bottom: 0.75rem;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.125rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-section-alt);
        }
        .faq-question i {
            font-size: 1.2rem;
            color: var(--primary);
            transition: transform var(--transition);
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 1.5rem 1.125rem 1.5rem;
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.10;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2.25rem;
            font-weight: 800;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 2rem auto;
        }
        .cta-section .btn-custom {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .cta-section .btn-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
            background: #f8fafc;
            color: var(--primary-dark);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.80);
            padding: 60px 0 32px;
        }
        .site-footer .container {
            max-width: var(--container-max);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-brand i {
            font-size: 1.8rem;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-brand span {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-desc {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.60);
            max-width: 360px;
        }
        .footer-heading {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1.25rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 0.6rem;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.60);
            font-size: 0.9rem;
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 1.5rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.60);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Section Alt ===== */
        .section-alt {
            background: var(--bg-section-alt);
        }

        /* ===== Download Channel Cards ===== */
        .channel-card {
            text-align: center;
            padding: 2rem 1.5rem;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
            height: 100%;
        }
        .channel-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .channel-card .channel-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
        .channel-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .channel-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .channel-card .channel-badge {
            display: inline-block;
            margin-top: 0.75rem;
            padding: 2px 14px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            background: #dcfce7;
            color: #16a34a;
        }

        /* ===== System Requirement List ===== */
        .req-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.75rem;
        }
        .req-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0.75rem 1rem;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
        }
        .req-item i {
            color: var(--primary);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .req-item span {
            color: var(--text-body);
        }

        /* ===== Version Compare Table ===== */
        .version-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            background: var(--bg-card);
        }
        .version-table thead {
            background: var(--primary-gradient);
            color: #fff;
        }
        .version-table th {
            padding: 1rem 1.25rem;
            font-weight: 600;
            font-size: 0.95rem;
            text-align: center;
        }
        .version-table td {
            padding: 0.9rem 1.25rem;
            font-size: 0.9rem;
            text-align: center;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-body);
        }
        .version-table tbody tr:hover {
            background: var(--bg-section-alt);
        }
        .version-table .check-yes {
            color: #16a34a;
            font-weight: 700;
        }
        .version-table .check-no {
            color: var(--text-light);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .req-list {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .section-pad {
                padding: 56px 0;
            }
            .section-pad-sm {
                padding: 36px 0;
            }
            .section-title {
                font-size: 1.75rem;
            }
            .section-subtitle {
                font-size: 1rem;
                margin-bottom: 2rem;
            }

            .page-banner {
                padding: 72px 0 56px;
                min-height: 240px;
            }
            .page-banner h1 {
                font-size: 2rem;
            }
            .page-banner p {
                font-size: 1rem;
            }

            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.96);
                backdrop-filter: blur(18px);
                -webkit-backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 1rem 1.5rem 1.5rem;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-lg);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                gap: 4px;
            }
            .nav-menu.show {
                display: flex;
            }
            .nav-link {
                padding: 10px 16px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-cta {
                width: 100%;
                justify-content: center;
                margin-top: 6px;
            }
            .nav-item {
                width: 100%;
            }

            .stat-number {
                font-size: 2rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }

            .version-table {
                font-size: 0.8rem;
            }
            .version-table th,
            .version-table td {
                padding: 0.6rem 0.75rem;
            }

            .cta-section h2 {
                font-size: 1.75rem;
            }
            .cta-section p {
                font-size: 1rem;
            }

            .step-card {
                flex-direction: column;
                align-items: flex-start;
            }
            .step-number {
                width: 36px;
                height: 36px;
                font-size: 0.95rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .page-banner h1 {
                font-size: 1.65rem;
            }
            .page-banner p {
                font-size: 0.9rem;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .channel-card {
                padding: 1.25rem 1rem;
            }
            .channel-card .channel-icon {
                font-size: 2rem;
            }
            .btn-custom {
                padding: 10px 24px;
                font-size: 0.9rem;
            }
            .btn-custom-lg {
                padding: 14px 32px;
                font-size: 1rem;
            }
            .req-item {
                font-size: 0.8rem;
                padding: 0.6rem 0.75rem;
            }
            .faq-question {
                padding: 0.85rem 1rem;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 1rem 0.85rem 1rem;
                font-size: 0.85rem;
            }
            .version-table th,
            .version-table td {
                padding: 0.4rem 0.5rem;
                font-size: 0.7rem;
            }
        }

        /* ===== Focus & Accessibility ===== */
        a:focus-visible,
        button:focus-visible,
        .nav-link:focus-visible,
        .nav-cta:focus-visible,
        .btn-custom:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 3px;
            border-radius: var(--radius-full);
        }

        /* ===== Image Placeholder bg ===== */
        .img-placeholder-bg {
            background: var(--bg-section-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-light);
            font-size: 0.85rem;
            min-height: 160px;
            border-radius: var(--radius-sm);
        }

        /* ===== Bootstrap Override ===== */
        .accordion-button:not(.collapsed) {
            background: var(--primary-light);
            color: var(--primary);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: none;
            border-color: var(--border-color);
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --success: #10b981;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s ease;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-family);
            color: var(--text);
            background: var(--bg);
            line-height: 1.6;
            font-size: 16px;
            padding-top: var(--header-height);
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }

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

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1030;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .nav-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text);
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-brand i {
            font-size: 1.6rem;
            color: var(--primary);
        }
        .nav-brand span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-brand:hover {
            color: var(--text);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--border-light);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-item {
            margin: 0;
        }
        .nav-link {
            display: block;
            padding: 8px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .nav-link.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 22px;
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            background: var(--primary);
            border-radius: 100px;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .nav-cta i {
            font-size: 1.1rem;
        }
        .nav-cta:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
        }
        .nav-cta:active {
            transform: translateY(0);
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            position: relative;
            padding: 80px 0 72px;
            background: linear-gradient(135deg, #1e3a5f 0%, #1a365d 40%, #0f2847 100%);
            overflow: hidden;
            min-height: 340px;
            display: flex;
            align-items: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            mix-blend-mode: overlay;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.25) 0%, transparent 70%);
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .category-hero h1 i {
            color: var(--accent);
            margin-right: 8px;
        }
        .category-hero p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 680px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .category-hero .hero-tags {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
        }
        .category-hero .hero-tags .badge {
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(4px);
            color: #fff;
            padding: 6px 18px;
            border-radius: 100px;
            font-weight: 500;
            font-size: 0.9rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-bg {
            background: var(--bg-white);
        }
        .section-alt {
            background: var(--primary-bg);
        }
        .section-dark {
            background: #0f172a;
            color: #fff;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-dark .section-header h2 {
            color: #fff;
        }
        .section-dark .section-header p {
            color: rgba(255, 255, 255, 0.7);
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
            margin: 16px auto 0;
        }
        .section-dark .section-divider {
            background: var(--accent);
        }

        /* ===== 卡片通用 ===== */
        .card-custom {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: all var(--transition);
            height: 100%;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card-custom .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin-bottom: 16px;
        }
        .card-custom h5 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text);
        }
        .card-custom p {
            font-size: 0.95rem;
            color: var(--text-light);
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* ===== 功能概览 ===== */
        .feature-grid .card-custom {
            text-align: center;
            padding: 36px 24px 32px;
        }
        .feature-grid .card-custom .card-icon {
            margin: 0 auto 18px;
            background: var(--primary-bg);
            border-radius: 50%;
            width: 64px;
            height: 64px;
            font-size: 1.8rem;
        }

        /* ===== 功能详情（图文交错） ===== */
        .detail-row {
            display: flex;
            align-items: center;
            gap: 48px;
            margin-bottom: 60px;
        }
        .detail-row:last-child {
            margin-bottom: 0;
        }
        .detail-row.reverse {
            flex-direction: row-reverse;
        }
        .detail-img {
            flex: 1 1 48%;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: var(--border-light);
            min-height: 240px;
        }
        .detail-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }
        .detail-text {
            flex: 1 1 48%;
        }
        .detail-text .detail-badge {
            display: inline-block;
            padding: 4px 14px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }
        .detail-text h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }
        .detail-text p {
            font-size: 1rem;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .detail-text ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .detail-text ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 6px 0;
            font-size: 0.95rem;
            color: var(--text-light);
        }
        .detail-text ul li i {
            color: var(--success);
            font-size: 1.1rem;
            margin-top: 2px;
            flex-shrink: 0;
        }

        /* ===== 使用流程 ===== */
        .steps-wrapper {
            display: flex;
            gap: 24px;
            justify-content: center;
            flex-wrap: wrap;
            counter-reset: step;
        }
        .step-card {
            flex: 1 1 180px;
            max-width: 220px;
            text-align: center;
            padding: 32px 16px 24px;
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            position: relative;
            transition: all var(--transition);
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .step-card::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
        }
        .step-card .step-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .step-card h5 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text);
        }
        .step-card p {
            font-size: 0.88rem;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius);
            border: 1px solid rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(4px);
            transition: all var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }
        .stat-item .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-item .stat-number i {
            font-size: 1.8rem;
            color: var(--accent);
            margin-right: 6px;
        }
        .stat-item .stat-label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.7);
            font-weight: 500;
        }

        /* ===== 用户评价 ===== */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .review-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px 24px 24px;
            transition: all var(--transition);
        }
        .review-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
        }
        .review-card .review-stars {
            color: var(--accent);
            font-size: 1rem;
            margin-bottom: 12px;
            letter-spacing: 2px;
        }
        .review-card .review-text {
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 16px;
            font-style: italic;
        }
        .review-card .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .review-card .review-author .avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .review-card .review-author .name {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text);
        }
        .review-card .review-author .role {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-item .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
            gap: 12px;
        }
        .faq-item .faq-question:hover {
            background: var(--border-light);
        }
        .faq-item .faq-question i {
            font-size: 1.2rem;
            color: var(--primary);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
            background: #fff;
            border-radius: 100px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
        }
        .cta-section .btn-cta i {
            font-size: 1.3rem;
        }
        .cta-section .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
            background: #f8fafc;
        }
        .cta-section .btn-cta:active {
            transform: translateY(0);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand i {
            font-size: 1.5rem;
            color: var(--primary-light);
        }
        .footer-desc {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-heading {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-heading::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 2px;
            background: var(--primary-light);
            border-radius: 1px;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            transition: color var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-links a:hover {
            color: var(--primary-light);
        }
        .footer-links a::before {
            content: '›';
            font-weight: 700;
            font-size: 1.1rem;
            transition: transform var(--transition);
        }
        .footer-links a:hover::before {
            transform: translateX(3px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--primary-light);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .detail-row,
            .detail-row.reverse {
                flex-direction: column;
                gap: 32px;
            }
            .detail-img {
                width: 100%;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-hero h1 {
                font-size: 2.2rem;
            }
            .category-hero p {
                font-size: 1.05rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s ease;
                pointer-events: none;
                border-radius: 0 0 var(--radius) var(--radius);
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-link {
                padding: 12px 16px;
                font-size: 1rem;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-link.active::after {
                display: none;
            }
            .nav-cta {
                margin-top: 8px;
                justify-content: center;
                width: 100%;
                padding: 12px 24px;
            }
            .section {
                padding: 56px 0;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .category-hero {
                padding: 56px 0 48px;
                min-height: 260px;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero p {
                font-size: 0.95rem;
            }
            .feature-grid .card-custom {
                padding: 24px 16px 20px;
            }
            .steps-wrapper {
                gap: 16px;
            }
            .step-card {
                flex: 1 1 140px;
                max-width: 160px;
                padding: 28px 12px 20px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-item .stat-number {
                font-size: 2rem;
            }
            .review-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .detail-text h3 {
                font-size: 1.3rem;
            }
            .container {
                padding: 0 16px;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .btn-cta {
                padding: 14px 32px;
                font-size: 1rem;
            }
        }

        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.5rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .step-card {
                flex: 1 1 120px;
                max-width: 140px;
                padding: 24px 10px 16px;
            }
            .step-card .step-icon {
                font-size: 1.5rem;
            }
            .step-card h5 {
                font-size: 0.9rem;
            }
            .section-header h2 {
                font-size: 1.35rem;
            }
            .cta-section .btn-cta {
                width: 100%;
                justify-content: center;
            }
            .hero-tags .badge {
                font-size: 0.8rem;
                padding: 4px 14px;
            }
        }