/* roulang page: index */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --accent: #f97316;
            --accent-dark: #ea580c;
            --bg: #f8fafc;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --radius: 0.75rem;
            --shadow: 0 1px 3px 0 rgba(0,0,0,0.06), 0 1px 2px 0 rgba(0,0,0,0.04);
            --shadow-hover: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -5px rgba(0,0,0,0.04);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body { font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); line-height: 1.7; -webkit-font-smoothing: antialiased; }
        a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
        @media (max-width: 768px) { .container { padding: 0 1rem; } }
        .section { padding: 4rem 0; }
        @media (max-width: 768px) { .section { padding: 2.5rem 0; } }
        .section-title { font-size: 1.875rem; font-weight: 700; text-align: center; margin-bottom: 0.75rem; letter-spacing: -0.02em; color: var(--text); }
        @media (max-width: 768px) { .section-title { font-size: 1.5rem; } }
        .section-subtitle { text-align: center; color: var(--text-secondary); font-size: 1.05rem; max-width: 640px; margin: 0 auto 2.5rem; line-height: 1.6; }
        .btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.75rem 1.75rem; border-radius: 9999px; font-weight: 600; font-size: 0.95rem; border: none; cursor: pointer; transition: all 0.25s ease; outline: none; }
        .btn:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }
        .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3); }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4); }
        .btn-accent { background: var(--accent); color: #fff; box-shadow: 0 4px 14px rgba(249, 115, 22, 0.3); }
        .btn-accent:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(249, 115, 22, 0.4); }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .btn-white { background: #fff; color: var(--primary); box-shadow: var(--shadow); }
        .btn-white:hover { background: #f1f5f9; transform: translateY(-2px); box-shadow: var(--shadow-hover); }
        .card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); transition: all 0.3s ease; border: 1px solid var(--border); overflow: hidden; }
        .card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
        .badge { display: inline-flex; align-items: center; padding: 0.25rem 0.75rem; border-radius: 9999px; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.02em; }
        .badge-primary { background: #dbeafe; color: #1d4ed8; }
        .badge-accent { background: #ffedd5; color: #c2410c; }
        .badge-green { background: #d1fae5; color: #065f46; }
        .badge-purple { background: #ede9fe; color: #5b21b6; }
        .tag { display: inline-block; padding: 0.3rem 0.8rem; border-radius: 9999px; font-size: 0.8rem; font-weight: 500; background: #f1f5f9; color: var(--text-secondary); transition: all 0.2s ease; cursor: default; }
        .tag:hover { background: #e2e8f0; }
        .divider { height: 1px; background: var(--border); margin: 2.5rem 0; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
        @media (max-width: 1024px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 768px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }
        .fade-in { animation: fadeIn 0.6s ease forwards; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
        .stagger-1 { animation-delay: 0.1s; }
        .stagger-2 { animation-delay: 0.2s; }
        .stagger-3 { animation-delay: 0.3s; }
        .stagger-4 { animation-delay: 0.4s; }
        .nav-link { position: relative; font-weight: 500; padding: 0.5rem 0; color: var(--text-secondary); transition: color 0.2s ease; }
        .nav-link::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--primary); transition: width 0.3s ease; border-radius: 1px; }
        .nav-link:hover { color: var(--primary); }
        .nav-link:hover::after { width: 100%; }
        .nav-link.active { color: var(--primary); }
        .nav-link.active::after { width: 100%; }
        .mobile-nav { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
        .mobile-nav.open { max-height: 500px; }
        .stat-number { font-size: 2.5rem; font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
        @media (max-width: 768px) { .stat-number { font-size: 2rem; } }
        .hero-gradient { background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #1d4ed8 100%); position: relative; overflow: hidden; }
        .hero-gradient::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(ellipse at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 60%); pointer-events: none; }
        .hero-gradient::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--accent), #fbbf24, var(--accent)); }
        .faq-item summary { cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 0; font-weight: 600; font-size: 1.05rem; color: var(--text); transition: color 0.2s ease; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after { content: '\f107'; font-family: 'Font Awesome 6 Free'; font-weight: 900; transition: transform 0.3s ease; font-size: 1.1rem; color: var(--text-muted); }
        .faq-item[open] summary::after { transform: rotate(180deg); }
        .faq-item summary:hover { color: var(--primary); }
        .faq-item .faq-answer { padding: 0 0 1.25rem; color: var(--text-secondary); line-height: 1.7; }
        .footer-link { color: #cbd5e1; transition: color 0.2s ease; font-size: 0.9rem; }
        .footer-link:hover { color: #fff; }
        .news-card .news-img { height: 180px; object-fit: cover; width: 100%; transition: transform 0.4s ease; }
        .news-card:hover .news-img { transform: scale(1.05); }
        .news-card .img-wrap { overflow: hidden; }
        .pill-nav { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; }
        .pill-nav a { padding: 0.5rem 1.25rem; border-radius: 9999px; font-size: 0.9rem; font-weight: 500; background: #fff; color: var(--text-secondary); border: 1px solid var(--border); transition: all 0.2s ease; }
        .pill-nav a:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-1px); }
        .pill-nav a.active { background: var(--primary); color: #fff; border-color: var(--primary); }
        @media (max-width: 640px) { .pill-nav a { font-size: 0.8rem; padding: 0.4rem 1rem; } }
        .icon-circle { width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; flex-shrink: 0; }
        .scrollbar-hide::-webkit-scrollbar { display: none; }
        .scrollbar-hide { -ms-overflow-style: none; scrollbar-width: none; }
        .hero-pattern { position: absolute; inset: 0; opacity: 0.05; background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); }
        @media (max-width: 480px) { .hero-title { font-size: 2rem !important; } .hero-sub { font-size: 1rem !important; } }

/* roulang page: article */
:root {
            --primary-50: #eff6ff;
            --primary-100: #dbeafe;
            --primary-200: #bfdbfe;
            --primary-300: #93c5fd;
            --primary-400: #60a5fa;
            --primary-500: #3b82f6;
            --primary-600: #2563eb;
            --primary-700: #1d4ed8;
            --primary-800: #1e40af;
            --primary-900: #1e3a8a;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
            --shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
            --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
            --radius-sm: 0.375rem;
            --radius: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            margin: 0;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            font-size: 1rem;
            line-height: 1.6;
            color: var(--gray-800);
            background-color: #ffffff;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .container {
            width: 100%;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

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

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

        button,
        input,
        textarea {
            font: inherit;
            transition: var(--transition);
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--primary-500);
            outline-offset: 2px;
        }

        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            font-weight: 600;
            border-radius: var(--radius);
            cursor: pointer;
            transition: var(--transition);
            border: none;
            line-height: 1.2;
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
            color: #fff;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 1px 4px rgba(37, 99, 235, 0.3);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary-600);
            border: 1.5px solid var(--primary-200);
        }
        .btn-outline:hover {
            background: var(--primary-50);
            border-color: var(--primary-300);
            transform: translateY(-1px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }

        .btn-ghost {
            background: transparent;
            color: var(--gray-600);
        }
        .btn-ghost:hover {
            background: var(--gray-100);
            color: var(--primary-600);
        }

        .nav-link {
            position: relative;
            font-weight: 500;
            color: var(--gray-600);
            padding: 0.375rem 1rem;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--primary-600);
            background: var(--primary-50);
        }
        .nav-link.active {
            color: var(--primary-700);
            background: var(--primary-100);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--primary-600);
            border-radius: 1px;
        }

        .footer-link {
            color: var(--gray-400);
            font-size: 0.875rem;
            transition: var(--transition);
            position: relative;
            padding-left: 0;
        }
        .footer-link:hover {
            color: #fff;
            padding-left: 4px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        .badge-primary {
            background: var(--primary-100);
            color: var(--primary-700);
        }

        .badge-gray {
            background: var(--gray-100);
            color: var(--gray-600);
        }

        .article-content {
            font-size: 1.0625rem;
            line-height: 1.85;
            color: var(--gray-800);
        }
        .article-content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            color: var(--gray-900);
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--gray-200);
        }
        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
            color: var(--gray-900);
        }
        .article-content p {
            margin-bottom: 1.25rem;
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 1.25rem;
            padding-left: 1.5rem;
        }
        .article-content li {
            margin-bottom: 0.5rem;
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary-400);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            background: var(--gray-50);
            border-radius: 0 var(--radius) var(--radius) 0;
            color: var(--gray-700);
            font-style: italic;
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 1.5rem auto;
            box-shadow: var(--shadow-md);
        }
        .article-content a {
            color: var(--primary-600);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content a:hover {
            color: var(--primary-800);
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.9375rem;
        }
        .article-content th,
        .article-content td {
            padding: 0.75rem 1rem;
            border: 1px solid var(--gray-200);
            text-align: left;
        }
        .article-content th {
            background: var(--gray-50);
            font-weight: 600;
            color: var(--gray-700);
        }
        .article-content tr:nth-child(even) td {
            background: var(--gray-50);
        }

        .card {
            background: #fff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--gray-900);
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .section-subtitle {
            font-size: 1.0625rem;
            color: var(--gray-500);
            max-width: 560px;
        }

        @media (max-width: 767px) {
            .section-title {
                font-size: 1.375rem;
            }
            .section-subtitle {
                font-size: 0.9375rem;
            }
            .article-content {
                font-size: 0.9375rem;
                line-height: 1.75;
            }
            .article-content h2 {
                font-size: 1.25rem;
            }
            .article-content h3 {
                font-size: 1.1rem;
            }
        }

        .mobile-nav {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease, padding 0.3s ease;
            opacity: 0;
            padding: 0 1.25rem;
            background: #fff;
            border-top: 1px solid var(--gray-100);
        }
        .mobile-nav.open {
            max-height: 480px;
            opacity: 1;
            padding: 1rem 1.25rem 1.25rem;
        }
        .mobile-nav a {
            display: block;
            padding: 0.625rem 0;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--gray-700);
            border-bottom: 1px solid var(--gray-100);
            transition: var(--transition);
        }
        .mobile-nav a:last-child {
            border-bottom: none;
        }
        .mobile-nav a:hover,
        .mobile-nav a.active {
            color: var(--primary-600);
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-up {
            animation: fadeUp 0.6s ease forwards;
        }

        .sticky-nav {
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background: rgba(255, 255, 255, 0.92);
        }

        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.375rem;
            font-size: 0.8125rem;
            color: var(--gray-500);
        }
        .breadcrumb a {
            color: var(--gray-500);
        }
        .breadcrumb a:hover {
            color: var(--primary-600);
        }
        .breadcrumb .sep {
            color: var(--gray-300);
            font-size: 0.75rem;
        }
        .breadcrumb .current {
            color: var(--gray-800);
            font-weight: 500;
        }

        .tag {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.875rem;
            border-radius: 9999px;
            font-size: 0.8125rem;
            font-weight: 500;
            background: var(--gray-100);
            color: var(--gray-600);
            transition: var(--transition);
        }
        .tag:hover {
            background: var(--primary-100);
            color: var(--primary-700);
        }

        .share-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 9999px;
            background: var(--gray-100);
            color: var(--gray-600);
            transition: var(--transition);
        }
        .share-btn:hover {
            background: var(--primary-100);
            color: var(--primary-600);
            transform: translateY(-2px);
        }

        @media (min-width: 768px) {
            .md\:sticky-sidebar {
                position: sticky;
                top: 7rem;
            }
        }

        .prose-custom {
            max-width: 720px;
            margin: 0 auto;
        }

        .related-card {
            transition: var(--transition);
        }
        .related-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }
        .related-card img {
            transition: var(--transition);
        }
        .related-card:hover img {
            transform: scale(1.03);
        }

        .article-header-gradient {
            background: linear-gradient(135deg, var(--gray-900) 0%, #1e3a5f 100%);
            position: relative;
            overflow: hidden;
        }
        .article-header-gradient::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .article-header-gradient::after {
            content: '';
            position: absolute;
            inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            pointer-events: none;
        }

/* roulang page: category1 */
:root {
            --primary-50: #eef2ff;
            --primary-100: #e0e7ff;
            --primary-200: #c7d2fe;
            --primary-300: #a5b4fc;
            --primary-400: #818cf8;
            --primary-500: #6366f1;
            --primary-600: #4f46e5;
            --primary-700: #4338ca;
            --primary-800: #3730a3;
            --primary-900: #312e81;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
            --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.10), 0 10px 10px -5px rgba(0,0,0,0.04);
            --radius-sm: 0.5rem;
            --radius: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; line-height: 1.6; background: #fafbfc; color: var(--gray-800); -webkit-font-smoothing: antialiased; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.25rem; }
        @media (min-width: 768px) { .container { padding: 0 2rem; } }
        a { color: inherit; text-decoration: none; }
        img { max-width: 100%; height: auto; display: block; }
        button { cursor: pointer; font-family: inherit; }

        /* 导航 */
        .nav-link { position: relative; color: var(--gray-600); font-weight: 500; transition: all 0.2s; border-radius: var(--radius-sm); padding: 0.375rem 0.75rem; }
        .nav-link:hover { color: var(--primary-600); background: rgba(99,102,241,0.06); }
        .nav-link.active { color: var(--primary-600); background: rgba(99,102,241,0.10); font-weight: 600; }
        .nav-link.active::after { content: ''; position: absolute; bottom: -1px; left: 50%; transform: translateX(-50%); width: 50%; height: 2px; background: var(--primary-600); border-radius: 2px; }
        .mobile-nav { max-height: 0; overflow: hidden; transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1); background: white; border-bottom: 1px solid var(--gray-100); }
        .mobile-nav.open { max-height: 26rem; }
        .mobile-nav a { display: block; padding: 0.75rem 1.25rem; color: var(--gray-700); font-weight: 500; border-left: 3px solid transparent; transition: all 0.2s; }
        .mobile-nav a:hover { background: var(--gray-50); color: var(--primary-600); }
        .mobile-nav a.active { border-left-color: var(--primary-600); color: var(--primary-600); background: rgba(99,102,241,0.06); }

        /* 按钮 */
        .btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; font-weight: 500; border-radius: var(--radius-sm); padding: 0.625rem 1.5rem; transition: all 0.25s; cursor: pointer; border: 1.5px solid transparent; text-decoration: none; font-size: 0.9375rem; line-height: 1.5; }
        .btn-primary { background: var(--primary-600); color: white; border-color: var(--primary-600); }
        .btn-primary:hover { background: var(--primary-700); border-color: var(--primary-700); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(79,70,229,0.35); }
        .btn-primary:active { transform: translateY(0); }
        .btn-outline { background: transparent; color: var(--primary-600); border-color: var(--primary-300); }
        .btn-outline:hover { background: var(--primary-50); border-color: var(--primary-400); }
        .btn-white { background: white; color: var(--primary-600); border-color: white; }
        .btn-white:hover { background: #f9fafb; transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .btn-sm { padding: 0.4rem 1rem; font-size: 0.8125rem; }
        .btn-lg { padding: 0.875rem 2rem; font-size: 1.0625rem; }

        /* 卡片 */
        .card { background: white; border-radius: var(--radius); box-shadow: var(--shadow); transition: all 0.35s cubic-bezier(0.4,0,0.2,1); overflow: hidden; }
        .card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
        .card-img { width: 100%; height: 200px; object-fit: cover; transition: transform 0.5s; }
        .card:hover .card-img { transform: scale(1.04); }

        /* 标签 */
        .tag { display: inline-flex; align-items: center; gap: 0.3rem; padding: 0.25rem 0.85rem; border-radius: 9999px; font-size: 0.75rem; font-weight: 500; background: var(--primary-50); color: var(--primary-700); line-height: 1.5; }
        .tag-gray { background: var(--gray-100); color: var(--gray-600); }
        .tag-green { background: #ecfdf5; color: #065f46; }
        .tag-orange { background: #fff7ed; color: #9a3412; }
        .tag-blue { background: #eff6ff; color: #1e40af; }

        /* 筛选按钮 */
        .filter-btn { display: inline-flex; align-items: center; padding: 0.4rem 1.125rem; border-radius: 9999px; font-size: 0.875rem; font-weight: 500; transition: all 0.2s; cursor: pointer; border: 1.5px solid var(--gray-200); background: white; color: var(--gray-600); white-space: nowrap; }
        .filter-btn:hover { border-color: var(--primary-300); color: var(--primary-600); background: var(--primary-50); }
        .filter-btn.active { background: var(--primary-600); color: white; border-color: var(--primary-600); box-shadow: 0 2px 8px rgba(79,70,229,0.25); }

        /* 统计数字 */
        .stat-number { font-size: 2.5rem; font-weight: 800; color: var(--primary-600); line-height: 1.1; letter-spacing: -0.02em; }
        .stat-label { font-size: 0.9375rem; color: var(--gray-500); font-weight: 400; }

        /* 进度条 */
        .progress-track { height: 8px; border-radius: 4px; background: var(--gray-100); overflow: hidden; }
        .progress-fill { height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--primary-400), var(--primary-600)); transition: width 0.8s ease; }

        /* 步骤 */
        .step-number { width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.125rem; color: white; background: var(--primary-600); flex-shrink: 0; }
        .step-line { width: 2px; flex-shrink: 0; background: var(--gray-200); margin: 0.25rem 0; }

        /* FAQ */
        .faq-item { border-bottom: 1px solid var(--gray-100); padding: 1.25rem 0; }
        .faq-question { display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 600; font-size: 1.0625rem; color: var(--gray-800); gap: 1rem; }
        .faq-question i { transition: transform 0.3s; color: var(--primary-500); font-size: 1.25rem; }
        .faq-item.open .faq-question i { transform: rotate(45deg); }
        .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s; padding-top: 0; color: var(--gray-600); font-size: 0.9375rem; line-height: 1.7; }
        .faq-item.open .faq-answer { max-height: 300px; padding-top: 0.75rem; }

        /* 滚动条隐藏 */
        .scrollbar-hide::-webkit-scrollbar { display: none; }
        .scrollbar-hide { -ms-overflow-style: none; scrollbar-width: none; }

        /* 分隔线装饰 */
        .divider-gradient { height: 4px; background: linear-gradient(90deg, var(--primary-400), var(--primary-600), var(--primary-400)); border-radius: 2px; width: 60px; margin: 0.75rem 0 1.5rem; }

        /* 板块间距 */
        .section { padding: 4rem 0; }
        @media (min-width: 768px) { .section { padding: 5.5rem 0; } }

        /* 背景装饰 */
        .bg-dots { background-image: radial-gradient(circle, rgba(99,102,241,0.08) 1px, transparent 1px); background-size: 20px 20px; }

        /* 自定义滚动条 */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--gray-50); }
        ::-webkit-scrollbar-thumb { background: #c4c4c4; border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: #a0a0a0; }

        /* 焦点样式 */
        a:focus-visible, button:focus-visible { outline: 2px solid var(--primary-500); outline-offset: 2px; border-radius: 4px; }

        /* 响应式调整 */
        @media (max-width: 640px) {
            .stat-number { font-size: 1.75rem; }
            .section { padding: 2.5rem 0; }
            .container { padding: 0 1rem; }
        }

        /* Tailwind 自定义主题色 */
        .tw-bg-primary { background-color: var(--primary-600); }
        .tw-text-primary { color: var(--primary-600); }
        .tw-border-primary { border-color: var(--primary-600); }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary-50: #eef2ff;
            --primary-100: #e0e7ff;
            --primary-200: #c7d2fe;
            --primary-300: #a5b4fc;
            --primary-400: #818cf8;
            --primary-500: #6366f1;
            --primary-600: #4f46e5;
            --primary-700: #4338ca;
            --primary-800: #3730a3;
            --primary-900: #312e81;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--gray-800);
            background-color: #ffffff;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }
        @media (min-width: 768px) {
            .container {
                padding: 0 32px;
            }
        }
        @media (min-width: 1024px) {
            .container {
                padding: 0 40px;
            }
        }

        /* ===== 导航 ===== */
        .nav-link {
            position: relative;
            font-weight: 500;
            color: var(--gray-600);
            border-radius: 6px;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--primary-600);
            background-color: var(--primary-50);
        }
        .nav-link.active {
            color: var(--primary-700);
            background-color: var(--primary-100);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 12px;
            right: 12px;
            height: 2px;
            background-color: var(--primary-500);
            border-radius: 2px;
        }
        .mobile-nav {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, opacity 0.3s ease;
            opacity: 0;
            background-color: #ffffff;
            border-bottom: 1px solid var(--gray-100);
        }
        .mobile-nav.open {
            max-height: 600px;
            opacity: 1;
        }
        .mobile-nav a {
            display: block;
            padding: 10px 20px;
            font-size: 15px;
            font-weight: 500;
            color: var(--gray-700);
            border-left: 3px solid transparent;
            transition: var(--transition);
        }
        .mobile-nav a:hover,
        .mobile-nav a.active {
            color: var(--primary-600);
            background-color: var(--primary-50);
            border-left-color: var(--primary-500);
        }
        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            padding: 10px 22px;
            transition: var(--transition);
            border: 1px solid transparent;
            font-size: 14px;
            letter-spacing: 0.01em;
        }
        .btn-primary {
            background-color: var(--primary-600);
            color: #ffffff;
            border-color: var(--primary-600);
        }
        .btn-primary:hover {
            background-color: var(--primary-700);
            border-color: var(--primary-700);
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-sm);
        }
        .btn-outline {
            background-color: transparent;
            color: var(--primary-600);
            border-color: var(--primary-300);
        }
        .btn-outline:hover {
            background-color: var(--primary-50);
            border-color: var(--primary-500);
            transform: translateY(-1px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-white {
            background-color: #ffffff;
            color: var(--primary-600);
            border-color: #ffffff;
        }
        .btn-white:hover {
            background-color: var(--gray-50);
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }
        .btn-ghost {
            background-color: transparent;
            color: var(--gray-600);
            border-color: transparent;
        }
        .btn-ghost:hover {
            background-color: var(--gray-100);
            color: var(--gray-800);
        }
        .btn-sm {
            padding: 6px 14px;
            font-size: 13px;
        }
        .btn-lg {
            padding: 14px 32px;
            font-size: 16px;
            border-radius: var(--radius);
        }

        /* ===== 卡片 ===== */
        .card {
            background-color: #ffffff;
            border-radius: var(--radius);
            border: 1px solid var(--gray-100);
            padding: 24px;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
            border-color: var(--gray-200);
        }
        .card-lg {
            padding: 32px;
        }
        .card-soft {
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .card-soft:hover {
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
            transform: translateY(-3px);
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 2px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.02em;
            background-color: var(--primary-100);
            color: var(--primary-700);
        }
        .badge-green {
            background-color: #d1fae5;
            color: #065f46;
        }
        .badge-orange {
            background-color: #fed7aa;
            color: #9a3412;
        }
        .badge-blue {
            background-color: #dbeafe;
            color: #1e40af;
        }
        .badge-purple {
            background-color: #e9d5ff;
            color: #6b21a8;
        }

        /* ===== 板块间距 ===== */
        .section {
            padding: 64px 0;
        }
        .section-sm {
            padding: 40px 0;
        }
        .section-lg {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-lg {
                padding: 56px 0;
            }
        }

        /* ===== Hero ===== */
        .hero-bg {
            background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 40%, #dbeafe 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-bg::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-bg::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -5%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(129, 140, 248, 0.10) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        /* ===== 统计数字 ===== */
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.1;
            color: var(--primary-600);
        }
        @media (max-width: 768px) {
            .stat-number {
                font-size: 2rem;
            }
        }

        /* ===== 流程步骤 ===== */
        .step-item {
            position: relative;
            padding-left: 48px;
        }
        .step-item::before {
            content: '';
            position: absolute;
            left: 16px;
            top: 40px;
            bottom: -20px;
            width: 2px;
            background-color: var(--gray-200);
        }
        .step-item:last-child::before {
            display: none;
        }
        .step-number {
            position: absolute;
            left: 0;
            top: 0;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background-color: var(--primary-100);
            color: var(--primary-700);
            font-weight: 700;
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 2px solid #ffffff;
            box-shadow: var(--shadow-sm);
        }

        /* ===== FAQ ===== */
        .faq-item {
            border-bottom: 1px solid var(--gray-100);
            padding: 18px 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--gray-800);
            cursor: pointer;
            padding: 4px 0;
            font-size: 15px;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary-600);
        }
        .faq-question .fa-chevron-down {
            transition: transform 0.3s ease;
            color: var(--gray-400);
            font-size: 12px;
        }
        .faq-question.open .fa-chevron-down {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            color: var(--gray-500);
            font-size: 14px;
            line-height: 1.7;
            padding: 0 20px 0 0;
        }
        .faq-answer.open {
            max-height: 300px;
            padding-top: 10px;
            padding-bottom: 6px;
        }

        /* ===== 页脚 ===== */
        .footer-link {
            color: var(--gray-400);
            font-size: 14px;
            transition: var(--transition);
            position: relative;
        }
        .footer-link:hover {
            color: #ffffff;
            padding-left: 4px;
        }
        .footer-link::before {
            content: '›';
            margin-right: 6px;
            opacity: 0.5;
        }

        /* ===== 响应式辅助 ===== */
        @media (max-width: 768px) {
            .text-balance {
                word-break: break-word;
            }
        }

        /* ===== 自定义滚动条 ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--gray-100);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--gray-300);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--gray-400);
        }

        /* ===== 聚焦可见性 ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary-500);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== 图片占位 ===== */
        .img-placeholder {
            background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
            border-radius: var(--radius-sm);
            min-height: 180px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--gray-400);
            font-size: 14px;
        }
        .img-placeholder-circle {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-600);
            font-size: 24px;
        }

        /* ===== 彩色图标块 ===== */
        .icon-block {
            width: 56px;
            height: 56px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            transition: var(--transition);
        }
        .icon-block:hover {
            transform: scale(1.05);
        }

        /* ===== 分隔线 ===== */
        .divider {
            height: 1px;
            background: linear-gradient(to right, transparent, var(--gray-200), transparent);
            margin: 16px 0;
        }

        /* ===== 阶段进度条 ===== */
        .progress-step {
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            flex: 1;
        }
        .progress-step .step-dot {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: var(--gray-200);
            color: var(--gray-500);
            font-weight: 700;
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 2px solid #ffffff;
            box-shadow: 0 0 0 2px var(--gray-200);
            transition: var(--transition);
            z-index: 2;
        }
        .progress-step.active .step-dot {
            background-color: var(--primary-600);
            color: #ffffff;
            box-shadow: 0 0 0 2px var(--primary-300);
        }
        .progress-step .step-label {
            margin-top: 8px;
            font-size: 13px;
            font-weight: 500;
            color: var(--gray-500);
            text-align: center;
            transition: var(--transition);
        }
        .progress-step.active .step-label {
            color: var(--primary-700);
            font-weight: 600;
        }
        .progress-bar-track {
            position: absolute;
            top: 18px;
            left: calc(50% + 18px);
            right: calc(-50% + 18px);
            height: 2px;
            background-color: var(--gray-200);
            z-index: 1;
        }
        .progress-step.active .progress-bar-track {
            background-color: var(--primary-300);
        }
        .progress-step:last-child .progress-bar-track {
            display: none;
        }

/* roulang page: category3 */
/* ===== 设计变量 ===== */
        :root {
            --primary-50: #eef2ff;
            --primary-100: #e0e7ff;
            --primary-200: #c7d2fe;
            --primary-300: #a5b4fc;
            --primary-400: #818cf8;
            --primary-500: #6366f1;
            --primary-600: #4f46e5;
            --primary-700: #4338ca;
            --primary-800: #3730a3;
            --primary-900: #312e81;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --text-primary: #111827;
            --text-secondary: #4b5563;
            --text-muted: #9ca3af;
            --border-radius: 12px;
            --border-radius-sm: 8px;
            --border-radius-lg: 16px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 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: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: #fff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
            transition: var(--transition);
        }
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            letter-spacing: -0.01em;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        @media (max-width: 640px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }

        /* ===== 导航 ===== */
        .nav-link {
            position: relative;
            font-weight: 500;
            color: var(--gray-600);
            transition: var(--transition);
            border-radius: var(--border-radius-sm);
        }
        .nav-link:hover {
            color: var(--primary-600);
            background-color: var(--primary-50);
        }
        .nav-link.active {
            color: var(--primary-700);
            background-color: var(--primary-100);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background-color: var(--primary-600);
            border-radius: 1px;
        }
        .mobile-nav {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, opacity 0.3s ease;
            opacity: 0;
            background: #fff;
            border-bottom: 1px solid var(--gray-100);
        }
        .mobile-nav.open {
            max-height: 500px;
            opacity: 1;
        }
        .mobile-nav a {
            display: block;
            padding: 0.75rem 1.5rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--gray-700);
            border-left: 3px solid transparent;
            transition: var(--transition);
        }
        .mobile-nav a:hover {
            background-color: var(--primary-50);
            color: var(--primary-600);
            border-left-color: var(--primary-500);
        }
        .mobile-nav a.active {
            background-color: var(--primary-50);
            color: var(--primary-700);
            border-left-color: var(--primary-600);
            font-weight: 600;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.625rem 1.5rem;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: var(--border-radius-sm);
            transition: var(--transition);
            border: 2px solid transparent;
            cursor: pointer;
            text-align: center;
            line-height: 1.4;
        }
        .btn-primary {
            background-color: var(--primary-600);
            color: #fff;
            border-color: var(--primary-600);
        }
        .btn-primary:hover {
            background-color: var(--primary-700);
            border-color: var(--primary-700);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-sm);
        }
        .btn-outline {
            background-color: transparent;
            color: var(--primary-600);
            border-color: var(--primary-300);
        }
        .btn-outline:hover {
            background-color: var(--primary-50);
            border-color: var(--primary-400);
            transform: translateY(-1px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-white {
            background-color: #fff;
            color: var(--primary-600);
            border-color: #fff;
        }
        .btn-white:hover {
            background-color: var(--gray-50);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .btn-sm {
            padding: 0.4rem 1rem;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 0.875rem 2rem;
            font-size: 1.05rem;
        }

        /* ===== 卡片 ===== */
        .card {
            background: #fff;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
            overflow: hidden;
            border: 1px solid var(--gray-100);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            transition: var(--transition);
        }
        .card:hover .card-img {
            transform: scale(1.03);
        }
        .card-body {
            padding: 1.5rem;
        }
        .card-tag {
            display: inline-block;
            padding: 0.2rem 0.7rem;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 999px;
            background-color: var(--primary-50);
            color: var(--primary-700);
            margin-bottom: 0.5rem;
        }
        .card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--gray-900);
            line-height: 1.4;
            margin-bottom: 0.5rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: 1rem;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 0.75rem;
            padding-top: 0.75rem;
            border-top: 1px solid var(--gray-100);
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            padding: 0.25rem 0.75rem;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 999px;
            background-color: var(--gray-100);
            color: var(--gray-700);
        }
        .badge-primary {
            background-color: var(--primary-100);
            color: var(--primary-800);
        }
        .badge-hot {
            background-color: #fef2f2;
            color: #dc2626;
        }
        .badge-new {
            background-color: #ecfdf5;
            color: #059669;
        }

        /* ===== 板块间距 ===== */
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding-top: 3rem;
                padding-bottom: 3rem;
            }
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            color: var(--gray-900);
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            line-height: 1.6;
        }
        @media (max-width: 640px) {
            .section-title {
                font-size: 1.6rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
            }
        }

        /* ===== 分隔线 ===== */
        .divider {
            width: 60px;
            height: 4px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--primary-500), var(--primary-300));
            margin-bottom: 1.5rem;
        }

        /* ===== FAQ ===== */
        .faq-item {
            border-bottom: 1px solid var(--gray-200);
            padding: 1.25rem 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--gray-900);
            cursor: pointer;
            padding: 0.25rem 0;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary-600);
        }
        .faq-question .icon {
            font-size: 1.2rem;
            transition: transform 0.3s ease;
            color: var(--text-muted);
        }
        .faq-question.open .icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 0 0 0;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0.75rem 0 0.25rem 0;
        }

        /* ===== 页脚 ===== */
        .footer-link {
            color: var(--gray-400);
            font-size: 0.92rem;
            transition: var(--transition);
            position: relative;
            padding-left: 0;
        }
        .footer-link:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-link::before {
            content: '›';
            margin-right: 0.4rem;
            color: var(--primary-400);
            font-weight: 700;
        }

        /* ===== 滚动条隐藏 ===== */
        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

        /* ===== 动画 ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-up {
            animation: fadeUp 0.6s ease forwards;
        }
        .delay-100 {
            animation-delay: 0.1s;
        }
        .delay-200 {
            animation-delay: 0.2s;
        }
        .delay-300 {
            animation-delay: 0.3s;
        }
        .delay-400 {
            animation-delay: 0.4s;
        }

        /* ===== 响应式辅助 ===== */
        @media (max-width: 1024px) {
            .lg\:hidden {
                display: block !important;
            }
            .lg\:flex {
                display: none !important;
            }
            .lg\:block {
                display: none !important;
            }
        }
        @media (min-width: 1025px) {
            .lg\:hidden {
                display: none !important;
            }
            .lg\:flex {
                display: flex !important;
            }
            .lg\:block {
                display: block !important;
            }
        }

        /* ===== 特色组件 ===== */
        .hero-gradient {
            background: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #4338ca 100%);
        }
        .glass-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary-600), var(--primary-400));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .video-play-btn {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.9);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary-600);
            transition: var(--transition);
            box-shadow: var(--shadow-lg);
        }
        .video-play-btn:hover {
            transform: scale(1.1);
            background: #fff;
            box-shadow: var(--shadow-xl);
        }
        .topic-card {
            transition: var(--transition);
            border: 1px solid var(--gray-100);
        }
        .topic-card:hover {
            border-color: var(--primary-200);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        /* 焦点状态 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--primary-500);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* 图片遮罩 */
        .img-overlay {
            position: relative;
            overflow: hidden;
        }
        .img-overlay::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.4), transparent 60%);
            pointer-events: none;
        }
        .img-overlay img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .img-overlay:hover img {
            transform: scale(1.05);
        }

        /* 自定义滚动条 */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--gray-100);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--gray-300);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--gray-400);
        }