/* roulang page: index */
:root {
            --primary: #1e40af;
            --primary-light: #3b82f6;
            --primary-lighter: #60a5fa;
            --accent: #eab308;
            --accent-soft: #fef9c3;
            --bg: #f8fafc;
            --surface: #ffffff;
            --surface-alt: #f1f5f9;
            --text: #1e293b;
            --text-strong: #0f172a;
            --text-muted: #64748b;
            --text-weak: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 0.5rem;
            --radius: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.10);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
            --transition-fast: 0.15s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.35s ease;
            --nav-width: 260px;
            --header-height: 64px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input,
        textarea {
            font-family: inherit;
        }
        :focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* 桌面端左侧竖向导航 */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: #ffffff;
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 100;
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
            overflow-y: auto;
            overflow-x: hidden;
        }
        .site-nav .nav-brand {
            padding: 1.5rem 1.5rem 1rem;
            border-bottom: 1px solid var(--border-light);
            flex-shrink: 0;
        }
        .site-nav .nav-brand a {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.01em;
            line-height: 1.3;
        }
        .site-nav .nav-brand .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .site-nav .nav-links {
            flex: 1;
            padding: 1rem 0.75rem;
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
        }
        .site-nav .nav-links a {
            display: flex;
            align-items: center;
            gap: 0.7rem;
            padding: 0.7rem 0.9rem;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text);
            transition: all var(--transition-fast);
            position: relative;
        }
        .site-nav .nav-links a:hover {
            background: #f1f5f9;
            color: var(--primary);
        }
        .site-nav .nav-links a.active {
            background: #eff6ff;
            color: var(--primary);
            font-weight: 600;
        }
        .site-nav .nav-links a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 20px;
            background: var(--primary);
            border-radius: 0 3px 3px 0;
        }
        .site-nav .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 0.9rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .site-nav .nav-links a:hover i,
        .site-nav .nav-links a.active i {
            color: var(--primary);
        }
        .site-nav .nav-footer {
            padding: 1rem 1.25rem;
            border-top: 1px solid var(--border-light);
            flex-shrink: 0;
            font-size: 0.8rem;
            color: var(--text-weak);
        }
        .site-nav .nav-cta {
            margin: 0.5rem 1rem 1rem;
            flex-shrink: 0;
        }
        .site-nav .nav-cta a {
            display: block;
            text-align: center;
            padding: 0.65rem 1rem;
            border-radius: var(--radius);
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            letter-spacing: 0.01em;
        }
        .site-nav .nav-cta a:hover {
            background: #1d4ed8;
            box-shadow: 0 4px 14px rgba(30, 64, 175, 0.3);
            transform: translateY(-1px);
        }

        /* 桌面端主内容区 */
        .main-wrapper {
            margin-left: var(--nav-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* 移动端顶部导航 */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: #ffffff;
            border-bottom: 1px solid var(--border);
            z-index: 200;
            align-items: center;
            justify-content: space-between;
            padding: 0 1rem;
            box-shadow: var(--shadow-sm);
        }
        .mobile-nav .mobile-brand {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--primary);
        }
        .mobile-nav .mobile-brand .brand-icon-sm {
            width: 30px;
            height: 30px;
            border-radius: 6px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 0.85rem;
            flex-shrink: 0;
        }
        .mobile-nav .hamburger {
            width: 40px;
            height: 40px;
            border: none;
            background: transparent;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--text);
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .mobile-nav .hamburger:hover {
            background: #f1f5f9;
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 150;
            transition: opacity var(--transition);
        }
        .mobile-overlay.show {
            display: block;
        }
        .mobile-drawer {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 280px;
            height: 100vh;
            background: #ffffff;
            z-index: 180;
            flex-direction: column;
            transform: translateX(-100%);
            transition: transform var(--transition);
            box-shadow: var(--shadow-lg);
            overflow-y: auto;
        }
        .mobile-drawer.open {
            transform: translateX(0);
        }
        .mobile-drawer .drawer-header {
            padding: 1.25rem;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-drawer .drawer-header .drawer-brand {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--primary);
        }
        .mobile-drawer .drawer-close {
            width: 36px;
            height: 36px;
            border: none;
            background: transparent;
            font-size: 1.3rem;
            color: var(--text-muted);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
        }
        .mobile-drawer .drawer-close:hover {
            background: #f1f5f9;
            color: var(--text);
        }
        .mobile-drawer .drawer-links {
            flex: 1;
            padding: 0.75rem;
            display: flex;
            flex-direction: column;
            gap: 0.15rem;
        }
        .mobile-drawer .drawer-links a {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.75rem 0.9rem;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text);
            transition: all var(--transition-fast);
        }
        .mobile-drawer .drawer-links a:hover {
            background: #f1f5f9;
            color: var(--primary);
        }
        .mobile-drawer .drawer-links a.active {
            background: #eff6ff;
            color: var(--primary);
            font-weight: 600;
        }
        .mobile-drawer .drawer-cta {
            margin: 0.5rem 1rem 1.25rem;
        }
        .mobile-drawer .drawer-cta a {
            display: block;
            text-align: center;
            padding: 0.7rem 1rem;
            border-radius: var(--radius);
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
        }
        .mobile-drawer .drawer-cta a:hover {
            background: #1d4ed8;
        }

        /* 组件样式 */
        .section-padding {
            padding: 4rem 2rem;
        }
        .card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--border);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.7rem 1.6rem;
            border-radius: var(--radius);
            background: var(--primary);
            color: #ffffff;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            transition: all var(--transition-fast);
            letter-spacing: 0.01em;
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: #1d4ed8;
            box-shadow: 0 6px 20px rgba(30, 64, 175, 0.3);
            transform: translateY(-1px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.65rem 1.5rem;
            border-radius: var(--radius);
            background: transparent;
            color: var(--primary);
            font-weight: 600;
            font-size: 0.95rem;
            border: 2px solid var(--primary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .btn-outline:hover {
            background: #eff6ff;
            border-color: #1d4ed8;
            color: #1d4ed8;
        }
        .badge {
            display: inline-block;
            padding: 0.25rem 0.7rem;
            border-radius: 999px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .badge-blue {
            background: #eff6ff;
            color: #1e40af;
        }
        .badge-amber {
            background: #fefce8;
            color: #a16207;
        }
        .badge-green {
            background: #f0fdf4;
            color: #166534;
        }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.1;
            color: var(--primary);
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 0.6rem;
            overflow: hidden;
            background: var(--surface);
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: #cbd5e1;
        }
        .faq-item summary {
            padding: 1rem 1.25rem;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.95rem;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: background var(--transition-fast);
        }
        .faq-item summary:hover {
            background: #f8fafc;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary .faq-icon {
            font-size: 0.8rem;
            color: var(--text-muted);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
            margin-left: 0.5rem;
        }
        .faq-item[open] summary .faq-icon {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item .faq-answer {
            padding: 0 1.25rem 1.1rem;
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* Hero背景叠加 */
        .hero-bg-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(30, 64, 175, 0.88) 0%, rgba(30, 58, 138, 0.78) 40%, rgba(15, 23, 42, 0.72) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }

        /* 响应式 */
        @media (max-width: 1023px) {
            .site-nav {
                display: none;
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .mobile-nav {
                display: flex;
            }
            .mobile-drawer {
                display: flex;
            }
            .section-padding {
                padding: 2.5rem 1rem;
            }
            .stat-number {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 640px) {
            .section-padding {
                padding: 2rem 0.75rem;
            }
            .stat-number {
                font-size: 1.5rem;
            }
            .btn-primary,
            .btn-outline {
                font-size: 0.85rem;
                padding: 0.55rem 1.1rem;
            }
            .faq-item summary {
                font-size: 0.88rem;
                padding: 0.85rem 1rem;
            }
            .faq-item .faq-answer {
                font-size: 0.82rem;
                padding: 0 1rem 0.9rem;
            }
        }
        @media (min-width: 1024px) {
            .mobile-nav,
            .mobile-drawer,
            .mobile-overlay {
                display: none !important;
            }
        }

        /* 过渡动画 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-in-up {
            animation: fadeInUp 0.6s ease forwards;
        }
        .animate-delay-1 {
            animation-delay: 0.1s;
            opacity: 0;
        }
        .animate-delay-2 {
            animation-delay: 0.2s;
            opacity: 0;
        }
        .animate-delay-3 {
            animation-delay: 0.3s;
            opacity: 0;
        }

/* roulang page: article */
:root {
            --color-primary: #1e3a5f;
            --color-primary-light: #2c5f8a;
            --color-accent: #e8831a;
            --color-accent-hover: #c97014;
            --color-bg: #f8fafc;
            --color-surface: #ffffff;
            --color-text: #1a202c;
            --color-text-soft: #4a5568;
            --color-text-muted: #718096;
            --color-border: #e2e8f0;
            --color-border-light: #edf2f7;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --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(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.06);
            --shadow-xl: 0 20px 48px rgba(0,0,0,0.12), 0 6px 12px rgba(0,0,0,0.07);
            --transition-fast: 0.18s ease;
            --transition-smooth: 0.28s ease;
            --nav-width: 260px;
            --nav-collapsed-width: 0px;
        }

        *, *::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: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

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

        :focus-visible {
            outline: 3px solid var(--color-accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        /* Layout: Sidebar + Content */
        .app-layout {
            display: flex;
            flex: 1;
            min-height: 100vh;
        }

        .app-sidebar {
            width: var(--nav-width);
            min-width: var(--nav-width);
            background: linear-gradient(180deg, #0f1f33 0%, #162d4a 40%, #1a3655 100%);
            color: #e2e8f0;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            border-right: 1px solid rgba(255,255,255,0.08);
            box-shadow: var(--shadow-lg);
            overflow-y: auto;
            overflow-x: hidden;
            transition: transform var(--transition-smooth);
        }

        .app-sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .app-sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .app-sidebar::-webkit-scrollbar-thumb {
            background: rgba(255,255,255,0.12);
            border-radius: 999px;
        }

        .app-main {
            flex: 1;
            margin-left: var(--nav-width);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            transition: margin-left var(--transition-smooth);
        }

        /* Sidebar Brand */
        .nav-brand {
            padding: 1.5rem 1.4rem 1.2rem;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            flex-shrink: 0;
        }
        .nav-brand a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: 0.02em;
            transition: opacity var(--transition-fast);
        }
        .nav-brand a:hover {
            opacity: 0.85;
        }
        .brand-icon {
            width: 38px;
            height: 38px;
            background: var(--color-accent);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 4px 12px rgba(232,131,26,0.35);
        }

        /* Sidebar Nav Links */
        .nav-links {
            flex: 1;
            padding: 1rem 0.9rem;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .nav-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0.7rem 0.9rem;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: #cbd5e0;
            transition: all var(--transition-fast);
            position: relative;
        }
        .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 0.9rem;
            opacity: 0.75;
            transition: opacity var(--transition-fast);
        }
        .nav-links a:hover {
            background: rgba(255,255,255,0.06);
            color: #ffffff;
        }
        .nav-links a:hover i {
            opacity: 1;
        }
        .nav-links a.active {
            background: rgba(255,255,255,0.1);
            color: #ffffff;
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--color-accent);
        }
        .nav-links a.active i {
            opacity: 1;
            color: var(--color-accent);
        }

        /* Sidebar CTA */
        .nav-cta {
            padding: 0.9rem 1.4rem 1.2rem;
            flex-shrink: 0;
            border-top: 1px solid rgba(255,255,255,0.08);
        }
        .nav-cta a {
            display: block;
            text-align: center;
            padding: 0.7rem 1rem;
            background: var(--color-accent);
            color: #fff;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.02em;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 14px rgba(232,131,26,0.3);
        }
        .nav-cta a:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 6px 20px rgba(232,131,26,0.45);
            transform: translateY(-1px);
        }

        /* Sidebar Footer */
        .nav-footer {
            padding: 0.9rem 1.4rem 1.2rem;
            font-size: 0.75rem;
            color: rgba(255,255,255,0.35);
            text-align: center;
            flex-shrink: 0;
            border-top: 1px solid rgba(255,255,255,0.05);
        }

        /* Mobile Nav Toggle */
        .mobile-nav-toggle {
            display: none;
            position: fixed;
            top: 14px;
            left: 14px;
            z-index: 1100;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-md);
            background: var(--color-primary);
            color: #fff;
            border: none;
            cursor: pointer;
            font-size: 1.2rem;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-fast);
        }
        .mobile-nav-toggle:hover {
            background: var(--color-primary-light);
        }
        .mobile-nav-toggle:active {
            transform: scale(0.94);
        }

        /* Mobile Overlay */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.55);
            z-index: 999;
            transition: opacity var(--transition-smooth);
        }
        .sidebar-overlay.active {
            display: block;
        }

        /* Main Content Area */
        .content-area {
            flex: 1;
            padding: 2rem 2.5rem;
            max-width: 900px;
            width: 100%;
            margin: 0 auto;
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.875rem;
            color: var(--color-text-muted);
            margin-bottom: 1.5rem;
            padding: 0.6rem 0;
        }
        .breadcrumb a {
            color: var(--color-primary-light);
            font-weight: 500;
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--color-accent);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .breadcrumb .separator {
            color: var(--color-border);
            font-size: 0.7rem;
            user-select: none;
        }
        .breadcrumb .current {
            color: var(--color-text-soft);
            font-weight: 500;
            pointer-events: none;
        }

        /* Article Header */
        .article-header {
            margin-bottom: 1.8rem;
            padding-bottom: 1.5rem;
            border-bottom: 2px solid var(--color-border-light);
        }
        .article-header .category-tag {
            display: inline-block;
            background: #eff6ff;
            color: var(--color-primary-light);
            padding: 0.3rem 0.85rem;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            margin-bottom: 0.8rem;
            border: 1px solid #dbeafe;
        }
        .article-header h1 {
            font-size: 1.9rem;
            font-weight: 750;
            line-height: 1.35;
            color: var(--color-text);
            margin-bottom: 0.8rem;
            letter-spacing: 0.01em;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1.2rem;
            font-size: 0.875rem;
            color: var(--color-text-muted);
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .article-meta .meta-item i {
            opacity: 0.6;
            font-size: 0.8rem;
        }

        /* Featured Image */
        .article-featured-image {
            margin-bottom: 2rem;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background: #f1f5f9;
        }
        .article-featured-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
            max-height: 420px;
            display: block;
        }

        /* Article Body */
        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--color-text-soft);
            margin-bottom: 2.5rem;
        }
        .article-body p {
            margin-bottom: 1.2rem;
        }
        .article-body h2 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--color-text);
            margin: 2rem 0 0.8rem;
            padding-left: 0.8rem;
            border-left: 4px solid var(--color-accent);
        }
        .article-body h3 {
            font-size: 1.15rem;
            font-weight: 650;
            color: var(--color-text);
            margin: 1.6rem 0 0.6rem;
        }
        .article-body ul,
        .article-body ol {
            margin: 0.8rem 0 1.2rem 1.4rem;
        }
        .article-body li {
            margin-bottom: 0.4rem;
        }
        .article-body blockquote {
            margin: 1.5rem 0;
            padding: 1rem 1.4rem;
            background: #f8fafc;
            border-left: 4px solid var(--color-primary-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-text-soft);
            font-style: italic;
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.2rem 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body a {
            color: var(--color-primary-light);
            text-decoration: underline;
            text-underline-offset: 3px;
            font-weight: 500;
        }
        .article-body a:hover {
            color: var(--color-accent);
        }

        /* Not Found State */
        .not-found-state {
            text-align: center;
            padding: 4rem 2rem;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--color-border-light);
        }
        .not-found-state .icon-circle {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: #fef3c7;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2rem;
            color: #d97706;
        }
        .not-found-state h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 0.6rem;
        }
        .not-found-state p {
            color: var(--color-text-muted);
            margin-bottom: 1.5rem;
            font-size: 0.95rem;
        }
        .not-found-state .back-btn {
            display: inline-block;
            padding: 0.7rem 1.8rem;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-sm);
        }
        .not-found-state .back-btn:hover {
            background: var(--color-primary-light);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .not-found-state .back-btn i {
            margin-right: 6px;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #1a3655 0%, #1e3a5f 50%, #162d4a 100%);
            border-radius: var(--radius-xl);
            padding: 2.2rem 2rem;
            text-align: center;
            color: #fff;
            margin-top: 2rem;
            box-shadow: var(--shadow-lg);
            border: 1px solid rgba(255,255,255,0.1);
        }
        .cta-section h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 0.6rem;
            letter-spacing: 0.02em;
        }
        .cta-section p {
            color: #cbd5e0;
            margin-bottom: 1.4rem;
            font-size: 0.95rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-section .cta-btn {
            display: inline-block;
            padding: 0.75rem 2rem;
            background: var(--color-accent);
            color: #fff;
            border-radius: 999px;
            font-weight: 650;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            transition: all var(--transition-fast);
            box-shadow: 0 6px 22px rgba(232,131,26,0.4);
        }
        .cta-section .cta-btn:hover {
            background: #f08c1f;
            box-shadow: 0 8px 28px rgba(232,131,26,0.55);
            transform: translateY(-2px);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .content-area {
                padding: 1.5rem 1.6rem;
                max-width: 100%;
            }
            .article-header h1 {
                font-size: 1.55rem;
            }
            .article-body {
                font-size: 0.98rem;
            }
        }

        @media (max-width: 768px) {
            .app-sidebar {
                transform: translateX(-100%);
            }
            .app-sidebar.open {
                transform: translateX(0);
            }
            .app-main {
                margin-left: 0;
            }
            .mobile-nav-toggle {
                display: flex;
            }
            .sidebar-overlay.active {
                display: block;
            }
            .content-area {
                padding: 1.2rem 1rem;
                padding-top: 4rem;
            }
            .article-header h1 {
                font-size: 1.35rem;
            }
            .article-featured-image img {
                max-height: 260px;
            }
            .article-body {
                font-size: 0.95rem;
                line-height: 1.75;
            }
            .article-meta {
                gap: 0.7rem;
                font-size: 0.8rem;
            }
            .cta-section {
                padding: 1.5rem 1.2rem;
                border-radius: var(--radius-lg);
            }
            .cta-section h3 {
                font-size: 1.15rem;
            }
            .breadcrumb {
                font-size: 0.8rem;
                margin-bottom: 1rem;
            }
        }

        @media (max-width: 520px) {
            .article-header h1 {
                font-size: 1.2rem;
            }
            .article-featured-image img {
                max-height: 200px;
                border-radius: var(--radius-md);
            }
            .article-body {
                font-size: 0.9rem;
                line-height: 1.7;
            }
            .cta-section {
                padding: 1.2rem 1rem;
                border-radius: var(--radius-md);
            }
            .not-found-state {
                padding: 2.5rem 1.2rem;
            }
            .not-found-state h2 {
                font-size: 1.2rem;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #2563eb;
            --color-primary-dark: #1d4ed8;
            --color-primary-light: #3b82f6;
            --color-accent: #f59e0b;
            --color-accent-dark: #d97706;
            --color-bg: #f8fafc;
            --color-surface: #ffffff;
            --color-text: #1e293b;
            --color-text-muted: #64748b;
            --color-text-light: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-nav-bg: #0f172a;
            --color-nav-text: #cbd5e1;
            --color-nav-hover: #ffffff;
            --color-nav-active-bg: rgba(37, 99, 235, 0.2);
            --color-success: #10b981;
            --color-success-light: #d1fae5;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 32px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.12);
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
        }

        *,
        *::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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ========== 左侧导航 ========== */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: auto;
            z-index: 1000;
            background-color: var(--color-nav-bg);
            display: flex;
            flex-direction: column;
            transition: transform var(--transition-normal), box-shadow var(--transition-normal);
        }

        .nav-mobile-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 18px;
            flex-shrink: 0;
        }

        .nav-brand a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #ffffff;
            font-weight: 700;
            font-size: 1.1rem;
            letter-spacing: -0.01em;
            white-space: nowrap;
        }

        .brand-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
            border-radius: var(--radius-sm);
            font-size: 1rem;
            color: #fff;
            flex-shrink: 0;
        }

        .nav-menu-toggle {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-sm);
            color: #fff;
            font-size: 1.3rem;
            transition: all var(--transition-fast);
        }

        .nav-menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.4);
        }

        .nav-menu-toggle:active {
            background: rgba(255, 255, 255, 0.15);
            transform: scale(0.95);
        }

        .nav-collapsible {
            display: none;
            flex-direction: column;
            padding: 0 18px 16px 18px;
            gap: 4px;
            overflow-y: auto;
            max-height: calc(100vh - 130px);
        }

        .nav-collapsible.nav-open {
            display: flex;
        }

        .nav-links {
            display: flex;
            flex-direction: column;
            gap: 3px;
        }

        .nav-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 11px 14px;
            border-radius: var(--radius-md);
            color: var(--color-nav-text);
            font-size: 0.95rem;
            font-weight: 500;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 0.9rem;
            opacity: 0.75;
        }

        .nav-links a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--color-nav-hover);
            transform: translateX(2px);
        }

        .nav-links a.active,
        .nav-links a[aria-current="page"] {
            background: var(--color-nav-active-bg);
            color: #ffffff;
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--color-primary);
        }

        .nav-links a.active i,
        .nav-links a[aria-current="page"] i {
            opacity: 1;
            color: var(--color-primary-light);
        }

        .nav-cta {
            margin-top: 10px;
            padding: 0 4px;
        }

        .nav-cta a {
            display: block;
            text-align: center;
            padding: 11px 18px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #ffffff;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.01em;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .nav-cta a:hover {
            background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
            transform: translateY(-1px);
        }

        .nav-cta a:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }

        .nav-footer {
            margin-top: auto;
            padding: 12px 8px 0;
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.35);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            display: none;
        }

        /* 桌面端导航 */
        @media (min-width: 768px) {
            .site-nav {
                width: 256px;
                height: 100vh;
                box-shadow: 2px 0 24px rgba(0, 0, 0, 0.18);
                padding: 0;
            }
            .nav-mobile-header {
                padding: 20px 20px 14px 20px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            }
            .nav-menu-toggle {
                display: none;
            }
            .nav-collapsible {
                display: flex;
                padding: 16px 14px 20px 14px;
                flex: 1;
                max-height: none;
            }
            .nav-footer {
                display: block;
                padding: 14px 20px 18px;
            }
            .nav-links a {
                padding: 10px 14px;
            }
        }

        @media (min-width: 1024px) {
            .site-nav {
                width: 272px;
            }
            .nav-brand a {
                font-size: 1.15rem;
            }
            .brand-icon {
                width: 38px;
                height: 38px;
                font-size: 1.05rem;
            }
        }

        /* ========== 主内容区 ========== */
        .main-content {
            padding-top: 70px;
            min-height: 100vh;
        }

        @media (min-width: 768px) {
            .main-content {
                margin-left: 256px;
                padding-top: 0;
            }
        }
        @media (min-width: 1024px) {
            .main-content {
                margin-left: 272px;
            }
        }

        /* ========== 板块通用 ========== */
        .section-padding {
            padding: 3rem 1.25rem;
        }
        @media (min-width: 768px) {
            .section-padding {
                padding: 4rem 2rem;
            }
        }
        @media (min-width: 1024px) {
            .section-padding {
                padding: 5rem 2.5rem;
            }
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--color-primary);
            background: #eff6ff;
            padding: 5px 14px;
            border-radius: 20px;
            margin-bottom: 0.75rem;
        }

        .section-title {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 0.75rem;
        }
        @media (min-width: 768px) {
            .section-title {
                font-size: 2rem;
            }
        }
        @media (min-width: 1024px) {
            .section-title {
                font-size: 2.25rem;
            }
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            max-width: 640px;
        }
        @media (min-width: 768px) {
            .section-subtitle {
                font-size: 1.1rem;
            }
        }

        /* ========== Hero板块 ========== */
        .hero-section {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            min-height: 420px;
            display: flex;
            align-items: center;
            color: #ffffff;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 41, 59, 0.78) 50%, rgba(15, 23, 42, 0.85) 100%);
            z-index: 1;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            width: 100%;
            max-width: 800px;
            padding: 3rem 1.5rem;
        }
        @media (min-width: 768px) {
            .hero-section {
                min-height: 460px;
            }
            .hero-inner {
                padding: 4rem 2.5rem;
            }
        }
        @media (min-width: 1024px) {
            .hero-section {
                min-height: 500px;
            }
            .hero-inner {
                padding: 5rem 3rem;
            }
        }
        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
            color: #ffffff;
            font-size: 0.85rem;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 20px;
            margin-bottom: 1rem;
            letter-spacing: 0.03em;
        }
        .hero-title {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.2;
            margin-bottom: 0.75rem;
            color: #ffffff;
        }
        @media (min-width: 768px) {
            .hero-title {
                font-size: 2.4rem;
            }
        }
        @media (min-width: 1024px) {
            .hero-title {
                font-size: 2.8rem;
            }
        }
        .hero-desc {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
            max-width: 560px;
            margin-bottom: 1.5rem;
        }
        @media (min-width: 768px) {
            .hero-desc {
                font-size: 1.1rem;
            }
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.01em;
            transition: all var(--transition-fast);
            white-space: nowrap;
            cursor: pointer;
        }
        .btn-primary {
            background: #ffffff;
            color: var(--color-primary-dark);
            box-shadow: var(--shadow-md);
        }
        .btn-primary:hover {
            background: #f1f5f9;
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-sm);
        }
        .btn-outline-light {
            background: transparent;
            color: #ffffff;
            border: 2px solid rgba(255, 255, 255, 0.5);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #ffffff;
            transform: translateY(-2px);
        }
        .btn-outline-light:active {
            transform: translateY(0);
        }

        /* ========== 卡片 ========== */
        .card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-light);
            overflow: hidden;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--color-border);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 1.25rem;
        }
        @media (min-width: 768px) {
            .card-body {
                padding: 1.5rem;
            }
        }
        .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.04em;
            padding: 4px 10px;
            border-radius: 14px;
            margin-bottom: 0.5rem;
        }
        .card-tag-blue {
            background: #eff6ff;
            color: #2563eb;
        }
        .card-tag-green {
            background: #d1fae5;
            color: #059669;
        }
        .card-tag-amber {
            background: #fef3c7;
            color: #d97706;
        }
        .card-tag-purple {
            background: #ede9fe;
            color: #7c3aed;
        }
        .card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 0.4rem;
            line-height: 1.35;
        }
        .card-desc {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        /* ========== 特色亮点卡片 ========== */
        .feature-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--color-border);
        }
        .feature-icon-circle {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            flex-shrink: 0;
        }
        .feature-icon-blue {
            background: #eff6ff;
            color: #2563eb;
        }
        .feature-icon-green {
            background: #d1fae5;
            color: #059669;
        }
        .feature-icon-amber {
            background: #fef3c7;
            color: #d97706;
        }
        .feature-icon-purple {
            background: #ede9fe;
            color: #7c3aed;
        }
        .feature-icon-rose {
            background: #ffe4e6;
            color: #e11d48;
        }
        .feature-icon-cyan {
            background: #cffafe;
            color: #0891b2;
        }
        .feature-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-text);
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        /* ========== 流程步骤 ========== */
        .step-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .step-number {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
        }
        .step-content h4 {
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 0.25rem;
        }
        .step-content p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        /* ========== FAQ ========== */
        .faq-item {
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-md);
            margin-bottom: 10px;
            background: var(--color-surface);
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--color-border);
            box-shadow: var(--shadow-sm);
        }
        .faq-item summary {
            padding: 16px 18px;
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--color-text);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.85rem;
            color: var(--color-text-muted);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-item[open] summary {
            color: var(--color-primary);
            border-bottom: 1px solid var(--color-border-light);
        }
        .faq-item .faq-answer {
            padding: 14px 18px 18px;
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }

        /* ========== CTA板块 ========== */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            color: #ffffff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 280px;
            height: 280px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.3) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.2) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-title {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 0.75rem;
        }
        @media (min-width: 768px) {
            .cta-title {
                font-size: 2rem;
            }
        }
        .cta-desc {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 1.5rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: linear-gradient(135deg, #f59e0b, #d97706);
            color: #ffffff;
            border-radius: 30px;
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.02em;
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
            transition: all var(--transition-normal);
        }
        .btn-cta:hover {
            box-shadow: 0 12px 32px rgba(245, 158, 11, 0.55);
            transform: translateY(-3px);
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
        }
        .btn-cta:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
        }

        /* ========== 页脚链接hover ========== */
        footer a {
            transition: color var(--transition-fast);
        }
        footer a:hover {
            color: #ffffff !important;
        }

        /* ========== 响应式辅助 ========== */
        @media (max-width: 767px) {
            .section-title {
                font-size: 1.4rem;
            }
            .hero-title {
                font-size: 1.5rem;
            }
            .hero-section {
                min-height: 360px;
            }
            .card-body {
                padding: 1rem;
            }
        }
        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.3rem;
            }
            .hero-desc {
                font-size: 0.9rem;
            }
            .btn {
                padding: 10px 18px;
                font-size: 0.85rem;
            }
            .hero-actions {
                flex-direction: column;
                gap: 8px;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .section-padding {
                padding: 2rem 1rem;
            }
            .feature-card {
                padding: 1.1rem;
            }
        }

/* roulang page: category2 */
:root {
            --color-primary: #1a56db;
            --color-primary-dark: #1e40af;
            --color-primary-light: #3b82f6;
            --color-accent: #f59e0b;
            --color-accent-dark: #d97706;
            --color-bg: #f8fafc;
            --color-surface: #ffffff;
            --color-text: #1e293b;
            --color-text-weak: #64748b;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-nav-bg: #0f172a;
            --color-nav-text: #cbd5e1;
            --color-nav-hover: #ffffff;
            --color-nav-active-bg: rgba(59, 130, 246, 0.15);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
            --transition-fast: 0.18s ease;
            --transition-normal: 0.28s ease;
            --nav-width: 240px;
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--color-text);
            background: var(--color-bg);
            display: flex;
            min-height: 100vh;
        }

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

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

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

        :focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
            border-radius: var(--radius-sm);
        }

        .skip-link {
            position: absolute;
            top: -100px;
            left: 16px;
            background: var(--color-primary);
            color: #fff;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            z-index: 9999;
            transition: top 0.3s;
        }
        .skip-link:focus {
            top: 10px;
        }

        /* ========== 左侧导航 ========== */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--color-nav-bg);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            box-shadow: 2px 0 24px rgba(0, 0, 0, 0.18);
            padding: 24px 0 16px 0;
            transition: transform var(--transition-normal);
        }

        .nav-brand {
            padding: 8px 20px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 16px;
        }
        .nav-brand a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #ffffff;
            font-weight: 700;
            font-size: 1.1rem;
            letter-spacing: 0.02em;
            transition: opacity var(--transition-fast);
        }
        .nav-brand a:hover {
            opacity: 0.85;
        }
        .brand-icon {
            width: 38px;
            height: 38px;
            background: var(--color-primary);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            flex-direction: column;
            gap: 2px;
            padding: 0 12px;
            flex: 1;
        }
        .nav-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 11px 14px;
            border-radius: var(--radius-md);
            color: var(--color-nav-text);
            font-size: 0.95rem;
            font-weight: 500;
            transition: all var(--transition-fast);
            position: relative;
        }
        .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 0.9rem;
            opacity: 0.7;
            transition: opacity var(--transition-fast);
        }
        .nav-links a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--color-nav-hover);
        }
        .nav-links a:hover i {
            opacity: 1;
        }
        .nav-links a.active {
            background: var(--color-nav-active-bg);
            color: #ffffff;
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--color-primary-light);
        }
        .nav-links a.active i {
            opacity: 1;
            color: var(--color-primary-light);
        }

        .nav-cta {
            padding: 16px 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: auto;
        }
        .nav-cta a {
            display: block;
            text-align: center;
            padding: 10px 20px;
            background: var(--color-primary);
            color: #ffffff;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
        }
        .nav-cta a:hover {
            background: var(--color-primary-dark);
            box-shadow: 0 4px 16px rgba(26, 86, 219, 0.4);
            transform: translateY(-1px);
        }

        .nav-footer {
            padding: 12px 20px 4px 20px;
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.35);
            text-align: center;
        }

        /* ========== 主内容区 ========== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
        }

        /* ========== Hero ========== */
        .page-hero {
            position: relative;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a3c6e 100%);
            padding: 72px 40px 64px 40px;
            color: #ffffff;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            z-index: 0;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, var(--color-bg) 0%, transparent 100%);
            z-index: 1;
        }
        .page-hero-content {
            position: relative;
            z-index: 2;
            max-width: 880px;
        }
        .page-hero .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #e2e8f0;
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 0.04em;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .page-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            margin: 0 0 16px 0;
            letter-spacing: -0.02em;
            color: #ffffff;
        }
        .page-hero h1 span {
            background: linear-gradient(135deg, #60a5fa, #93c5fd);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero .hero-desc {
            font-size: 1.1rem;
            color: #cbd5e1;
            line-height: 1.7;
            margin: 0 0 28px 0;
            max-width: 640px;
        }
        .page-hero .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            background: #ffffff;
            color: #1e293b;
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 0.95rem;
            transition: all var(--transition-normal);
            letter-spacing: 0.02em;
        }
        .btn-hero-primary:hover {
            background: #e2e8f0;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
        }
        .btn-hero-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            background: transparent;
            color: #ffffff;
            border: 2px solid rgba(255, 255, 255, 0.4);
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-normal);
            letter-spacing: 0.02em;
        }
        .btn-hero-outline:hover {
            border-color: #ffffff;
            background: rgba(255, 255, 255, 0.08);
        }

        /* ========== 通用板块 ========== */
        .section-padding {
            padding: 56px 40px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 44px;
        }
        .section-header .section-tag {
            display: inline-block;
            background: #eff6ff;
            color: var(--color-primary);
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            margin-bottom: 12px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-text);
            margin: 0 0 8px 0;
            letter-spacing: -0.01em;
        }
        .section-header p {
            font-size: 1rem;
            color: var(--color-text-weak);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* ========== 场景卡片网格 ========== */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        .scenario-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--color-border);
        }
        .scenario-card-img {
            height: 180px;
            overflow: hidden;
            position: relative;
            background: #e2e8f0;
        }
        .scenario-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .scenario-card:hover .scenario-card-img img {
            transform: scale(1.06);
        }
        .scenario-card-img .scenario-number {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--color-primary);
            color: #fff;
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            z-index: 2;
        }
        .scenario-card-body {
            padding: 20px 22px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .scenario-card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin: 0 0 8px 0;
            color: var(--color-text);
        }
        .scenario-card-body p {
            font-size: 0.9rem;
            color: var(--color-text-weak);
            line-height: 1.6;
            margin: 0 0 16px 0;
            flex: 1;
        }
        .scenario-card-body .scenario-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .scenario-tag {
            display: inline-block;
            padding: 4px 10px;
            background: #f1f5f9;
            color: #475569;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 500;
        }

        /* ========== 流程板块 ========== */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .process-step-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 1.3rem;
            position: relative;
            z-index: 2;
            box-shadow: 0 4px 16px rgba(26, 86, 219, 0.3);
            transition: transform var(--transition-normal);
        }
        .process-step:hover .process-step-icon {
            transform: scale(1.1);
        }
        .process-step h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin: 0 0 4px 0;
            color: var(--color-text);
        }
        .process-step p {
            font-size: 0.8rem;
            color: var(--color-text-weak);
            margin: 0;
            line-height: 1.5;
        }
        .process-connector {
            position: absolute;
            top: 28px;
            left: calc(50% + 28px);
            width: calc(100% - 56px);
            height: 2px;
            background: var(--color-border);
            z-index: 0;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--color-border);
            box-shadow: var(--shadow-md);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 16px 20px;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-question i {
            transition: transform var(--transition-normal);
            color: var(--color-text-weak);
            font-size: 0.85rem;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 16px 20px;
        }
        .faq-answer p {
            margin: 0;
            font-size: 0.9rem;
            color: var(--color-text-weak);
            line-height: 1.7;
        }

        /* ========== CTA ========== */
        .cta-block {
            background: linear-gradient(135deg, #1a56db 0%, #1e40af 100%);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            text-align: center;
            color: #ffffff;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
        }
        .cta-block>* {
            position: relative;
            z-index: 1;
        }
        .cta-block h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 0 0 10px 0;
        }
        .cta-block p {
            font-size: 1rem;
            opacity: 0.9;
            margin: 0 0 24px 0;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            background: #ffffff;
            color: var(--color-primary);
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition-normal);
            letter-spacing: 0.02em;
        }
        .btn-cta:hover {
            background: #f1f5f9;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
            transform: translateY(-2px);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            :root {
                --nav-width: 200px;
            }
            .page-hero {
                padding: 48px 28px 44px 28px;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
            .section-padding {
                padding: 40px 28px;
            }
            .scenarios-grid {
                grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
                gap: 18px;
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .process-connector {
                display: none;
            }
        }

        @media (max-width: 768px) {
            body {
                flex-direction: column;
            }
            .site-nav {
                position: relative;
                width: 100%;
                height: auto;
                flex-direction: row;
                flex-wrap: wrap;
                align-items: center;
                padding: 10px 16px;
                gap: 8px;
                box-shadow: 0 2px 16px rgba(0, 0, 0, 0.12);
            }
            .nav-brand {
                padding: 0;
                border-bottom: none;
                margin-bottom: 0;
            }
            .nav-brand a {
                font-size: 0.95rem;
                gap: 6px;
            }
            .brand-icon {
                width: 30px;
                height: 30px;
                font-size: 0.8rem;
                border-radius: 6px;
            }
            .nav-links {
                flex-direction: row;
                flex-wrap: wrap;
                gap: 4px;
                padding: 0;
                flex: 1 1 auto;
                order: 3;
                width: 100%;
                justify-content: flex-start;
                margin-top: 6px;
            }
            .nav-links a {
                padding: 8px 12px;
                font-size: 0.82rem;
                gap: 5px;
                border-radius: 6px;
            }
            .nav-links a i {
                font-size: 0.75rem;
                width: auto;
            }
            .nav-links a.active {
                box-shadow: none;
                background: var(--color-nav-active-bg);
            }
            .nav-cta {
                padding: 0;
                border-top: none;
                margin-top: 0;
                order: 2;
            }
            .nav-cta a {
                padding: 7px 14px;
                font-size: 0.8rem;
                border-radius: 6px;
            }
            .nav-footer {
                display: none;
            }
            .main-content {
                margin-left: 0;
            }
            .page-hero {
                padding: 36px 20px 32px 20px;
            }
            .page-hero h1 {
                font-size: 1.6rem;
            }
            .page-hero .hero-desc {
                font-size: 0.95rem;
            }
            .section-padding {
                padding: 32px 20px;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .scenario-card-img {
                height: 160px;
            }
            .process-steps {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .cta-block {
                padding: 32px 20px;
                border-radius: var(--radius-lg);
            }
            .cta-block h2 {
                font-size: 1.4rem;
            }
            .btn-hero-primary,
            .btn-hero-outline {
                padding: 11px 20px;
                font-size: 0.85rem;
            }
        }

        @media (max-width: 520px) {
            .site-nav {
                padding: 8px 10px;
                gap: 4px;
            }
            .nav-links a {
                padding: 6px 10px;
                font-size: 0.75rem;
                gap: 3px;
            }
            .nav-links a i {
                font-size: 0.7rem;
            }
            .nav-cta a {
                padding: 6px 12px;
                font-size: 0.75rem;
            }
            .page-hero {
                padding: 28px 14px 24px 14px;
            }
            .page-hero h1 {
                font-size: 1.35rem;
            }
            .page-hero .hero-desc {
                font-size: 0.85rem;
            }
            .page-hero .hero-actions {
                flex-direction: column;
                gap: 8px;
            }
            .btn-hero-primary,
            .btn-hero-outline {
                justify-content: center;
                width: 100%;
            }
            .section-padding {
                padding: 24px 14px;
            }
            .section-header h2 {
                font-size: 1.3rem;
            }
            .section-header p {
                font-size: 0.85rem;
            }
            .scenario-card-body {
                padding: 14px 16px 16px 16px;
            }
            .scenario-card-body h3 {
                font-size: 1rem;
            }
            .process-steps {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .cta-block {
                padding: 24px 14px;
            }
            .cta-block h2 {
                font-size: 1.2rem;
            }
            .faq-question {
                padding: 13px 16px;
                font-size: 0.85rem;
            }
            .faq-answer p {
                font-size: 0.82rem;
            }
        }