/* roulang page: index */
/* ============ 设计变量 ============ */
        :root {
            --brand-900: #0e1d42;
            --brand-800: #182a61;
            --brand-700: #243c88;
            --brand-600: #2e50b0;
            --brand-500: #3b65d8;
            --accent-500: #c9a050;
            --accent-400: #d5b66c;
            --bg-light: #f5f7fc;
            --bg-white: #ffffff;
            --text-dark: #0e1d42;
            --text-muted: #5a6b8a;
            --border-light: #e8ecf3;
            --radius-lg: 20px;
            --radius-md: 14px;
            --shadow-card: 0 4px 24px rgba(11, 31, 74, 0.07);
            --shadow-hover: 0 12px 36px rgba(11, 31, 74, 0.12);
            --transition-base: 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-text-size-adjust: 100%;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--bg-white);
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition-base);
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
        }
        input,
        textarea {
            font-family: inherit;
        }
        ::selection {
            background: rgba(201, 160, 80, 0.25);
            color: var(--brand-900);
        }

        /* ============ 导航玻璃沉浸 ============ */
        #siteHeader {
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            background: rgba(255, 255, 255, 0.72);
            border-bottom: 1px solid rgba(255, 255, 255, 0.25);
            box-shadow: 0 4px 30px rgba(11, 31, 74, 0.05);
            transition: var(--transition-base);
        }
        #siteHeader.scrolled {
            background: rgba(255, 255, 255, 0.92);
            box-shadow: 0 8px 32px rgba(11, 31, 74, 0.1);
            border-bottom-color: var(--border-light);
        }
        .nav-link {
            position: relative;
            padding: 8px 16px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition-base);
        }
        .nav-link:hover {
            color: var(--brand-800);
            background: rgba(59, 101, 216, 0.06);
        }
        .nav-link.active {
            color: var(--brand-800);
            background: rgba(59, 101, 216, 0.1);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 16px;
            height: 2px;
            border-radius: 2px;
            background: var(--accent-500);
        }

        /* ============ 按钮系统 ============ */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--brand-700), var(--brand-800));
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            box-shadow: 0 4px 16px rgba(14, 29, 66, 0.25);
            transition: var(--transition-base);
            position: relative;
            overflow: hidden;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(14, 29, 66, 0.32);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(14, 29, 66, 0.2);
        }
        .btn-primary::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 60%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
            animation: btn-shine 3s ease-in-out infinite;
        }
        @keyframes btn-shine {
            0% { left: -100%; }
            50% { left: 150%; }
            100% { left: -100%; }
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 14px;
            border: 1.5px solid rgba(255, 255, 255, 0.4);
            color: #fff;
            font-size: 15px;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(8px);
            transition: var(--transition-base);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: rgba(255, 255, 255, 0.7);
            transform: translateY(-2px);
        }

        .btn-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: 12px;
            background: var(--brand-800);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition-base);
            box-shadow: 0 4px 14px rgba(14, 29, 66, 0.18);
        }
        .btn-light:hover {
            background: var(--brand-700);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(14, 29, 66, 0.25);
        }

        /* ============ Hero ============ */
        .hero-section {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(7, 18, 48, 0.95) 0%, rgba(14, 29, 66, 0.85) 45%, rgba(59, 101, 216, 0.35) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            padding-top: 120px;
            padding-bottom: 100px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(213, 182, 108, 0.35);
            color: var(--accent-400);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.5px;
            backdrop-filter: blur(12px);
            margin-bottom: 24px;
        }
        .hero-title {
            font-size: clamp(2.4rem, 5vw, 4.2rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -1px;
            color: #fff;
            text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }
        .hero-title .accent {
            color: var(--accent-400);
            position: relative;
        }
        .hero-desc {
            font-size: clamp(1rem, 1.5vw, 1.2rem);
            color: rgba(255, 255, 255, 0.82);
            line-height: 1.8;
            max-width: 540px;
            margin-bottom: 32px;
        }
        .hero-stats {
            display: flex;
            gap: 32px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat .num {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
        }
        .hero-stat .label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 2px;
        }

        /* ============ 板块通用 ============ */
        .section {
            padding: 88px 0;
        }
        .section-alt {
            background: var(--bg-light);
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 100px;
            background: rgba(201, 160, 80, 0.12);
            color: #a8823e;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .section-title {
            font-size: clamp(1.8rem, 3vw, 2.6rem);
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.5px;
            color: var(--brand-900);
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            line-height: 1.8;
            max-width: 640px;
        }

        /* ============ 卡片系统 ============ */
        .feature-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-500), transparent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s ease;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .feature-card:hover::before {
            transform: scaleX(1);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
            background: linear-gradient(135deg, rgba(59, 101, 216, 0.1), rgba(201, 160, 80, 0.1));
            color: var(--brand-600);
        }

        /* 数据卡片 */
        .stat-card {
            text-align: center;
            padding: 36px 20px;
            border-radius: var(--radius-lg);
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .stat-number {
            font-size: 42px;
            font-weight: 800;
            color: var(--brand-800);
            line-height: 1.2;
        }
        .stat-number .unit {
            font-size: 20px;
            color: var(--accent-500);
            font-weight: 600;
            margin-left: 2px;
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 8px;
        }

        /* 分类卡片 */
        .category-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
            position: relative;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .category-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .category-card:hover img {
            transform: scale(1.05);
        }
        .category-body {
            padding: 24px;
        }

        /* 资讯卡片 */
        .post-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            padding: 24px;
            transition: var(--transition-base);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .post-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: rgba(59, 101, 216, 0.2);
        }
        .post-card .post-cat {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent-500);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 8px;
        }
        .post-card .post-title {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.5;
            color: var(--brand-900);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .post-excerpt {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 16px;
            flex: 1;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 12px;
            color: #9aa7c0;
            border-top: 1px solid var(--border-light);
            padding-top: 14px;
        }

        /* 流程步骤 */
        .step-item {
            position: relative;
            padding: 32px 24px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .step-num {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--brand-600), var(--brand-800));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 20px;
        }
        .step-connector {
            position: absolute;
            top: 50%;
            right: -20px;
            width: 40px;
            height: 2px;
            background: linear-gradient(90deg, var(--brand-300), transparent);
            z-index: 1;
        }
        @media (max-width: 1024px) {
            .step-connector {
                display: none;
            }
        }

        /* ============ FAQ 手风琴 ============ */
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition-base);
        }
        .faq-item:hover {
            border-color: rgba(59, 101, 216, 0.25);
        }
        .faq-item.active {
            border-color: rgba(59, 101, 216, 0.3);
            box-shadow: var(--shadow-card);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 15px;
            color: var(--brand-900);
        }
        .faq-question .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(59, 101, 216, 0.1);
            color: var(--brand-600);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            transition: var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--brand-800);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }
        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        /* ============ CTA 区块 ============ */
        .cta-section {
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, var(--brand-900), var(--brand-800));
            border-radius: 28px;
            padding: 60px 48px;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(201, 160, 80, 0.15), transparent 70%);
            border-radius: 50%;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -60%;
            left: 10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(59, 101, 216, 0.2), transparent 70%);
            border-radius: 50%;
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: #071230;
            color: rgba(255, 255, 255, 0.7);
        }
        .site-footer a {
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition-base);
        }
        .site-footer a:hover {
            color: var(--accent-400);
        }
        .footer-title {
            color: #fff;
            font-weight: 600;
            font-size: 16px;
            margin-bottom: 16px;
        }

        /* ============ 移动端菜单 ============ */
        .mobile-menu-open {
            display: block !important;
        }

        /* ============ 滚动动画 ============ */
        .animate-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .animate-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ============ 响应式 ============ */
        @media (max-width: 1024px) {
            .section {
                padding: 72px 0;
            }
            .hero-section {
                min-height: 90vh;
            }
            .hero-content {
                padding-top: 110px;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .hero-section {
                min-height: auto;
                padding: 140px 0 80px;
            }
            .hero-stats {
                flex-wrap: wrap;
                gap: 20px;
            }
            .cta-section {
                padding: 40px 24px;
                border-radius: 20px;
            }
            .stat-number {
                font-size: 32px;
            }
        }
        @media (max-width: 520px) {
            .section-title {
                font-size: 1.6rem;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .hero-stats {
                gap: 12px;
            }
            .hero-stat .num {
                font-size: 22px;
            }
            .feature-card {
                padding: 24px 20px;
            }
        }

        /* 聚焦可访问性 */
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent-500);
            outline-offset: 2px;
        }

        /* 图片遮罩 */
        .img-overlay {
            position: relative;
        }
        .img-overlay::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(14, 29, 66, 0.3), transparent);
            border-radius: inherit;
            pointer-events: none;
        }

/* roulang page: category1 */
:root {
            --brand-50: #f0f7ff;
            --brand-100: #e0effe;
            --brand-200: #b9dcfb;
            --brand-500: #1a73e8;
            --brand-600: #1557b0;
            --brand-700: #114a94;
            --brand-800: #0e3d78;
            --brand-900: #0a2c54;
            --brand-950: #061b36;
            --accent-400: #fbbf24;
            --accent-500: #f59e0b;
            --accent-600: #d97706;
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            color: #0f172a;
            background: #f8fafc;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1280px;
        }

        /* ---------- 导航 ---------- */
        #siteHeader {
            transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
            background: rgba(255, 255, 255, 0.68);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.45);
        }
        #siteHeader.scrolled {
            background: rgba(255, 255, 255, 0.92);
            box-shadow: 0 8px 30px rgba(15, 23, 42, 0.08);
            border-bottom-color: rgba(226, 232, 240, 0.8);
        }
        .nav-link {
            padding: 8px 16px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: #334155;
            transition: all .25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-link:hover {
            background: rgba(26, 115, 232, 0.08);
            color: #1557b0;
        }
        .nav-link.active {
            background: rgba(26, 115, 232, 0.10);
            color: #0e3d78;
            font-weight: 600;
        }

        /* ---------- 按钮 ---------- */
        .btn-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 11px 24px;
            background: linear-gradient(135deg, #1a73e8, #0e3d78);
            color: #fff !important;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 600;
            box-shadow: 0 8px 20px -6px rgba(10, 44, 84, 0.35);
            transition: all .3s ease;
            border: none;
            cursor: pointer;
        }
        .btn-light:hover {
            transform: translateY(-2px);
            box-shadow: 0 14px 30px -8px rgba(10, 44, 84, 0.45);
        }
        .btn-light:active {
            transform: translateY(0);
        }
        .btn-light-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.28);
            color: #fff !important;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 600;
            backdrop-filter: blur(8px);
            transition: all .3s ease;
            cursor: pointer;
        }
        .btn-light-outline:hover {
            background: rgba(255, 255, 255, 0.16);
            border-color: rgba(255, 255, 255, 0.5);
        }
        .btn-dark {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: linear-gradient(135deg, #0e3d78, #1a73e8);
            color: #fff;
            border-radius: 14px;
            font-weight: 600;
            box-shadow: 0 10px 25px -8px rgba(14, 61, 120, 0.4);
            transition: all .3s ease;
            font-size: 14px;
            border: none;
            cursor: pointer;
        }
        .btn-dark:hover {
            transform: translateY(-2px);
            box-shadow: 0 18px 35px -10px rgba(14, 61, 120, 0.5);
        }

        /* ---------- 板块 ---------- */
        .section {
            padding: 84px 0;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: #1a73e8;
            background: rgba(26, 115, 232, 0.08);
            padding: 6px 14px;
            border-radius: 999px;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            color: #0c1a2e;
            letter-spacing: -0.02em;
        }
        .section-desc {
            font-size: 16px;
            color: #475569;
            line-height: 1.75;
        }

        /* ---------- 面包屑 ---------- */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
            transition: color .25s;
        }
        .breadcrumb a:hover {
            color: #fbbf24;
        }
        .breadcrumb .sep {
            opacity: 0.5;
            font-size: 12px;
        }

        /* ---------- 状态徽章 ---------- */
        .badge-glass {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 16px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.18);
        }

        /* ---------- 特性卡片 ---------- */
        .feature-card {
            background: #fff;
            border-radius: 20px;
            padding: 28px;
            border: 1px solid #eef2f7;
            box-shadow: 0 8px 24px -12px rgba(15, 23, 42, 0.08);
            transition: all .3s ease;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 40px -16px rgba(15, 23, 42, 0.14);
            border-color: rgba(26, 115, 232, 0.15);
        }
        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
        }

        /* ---------- 流程步骤 ---------- */
        .step-card {
            position: relative;
            background: #fff;
            border-radius: 20px;
            padding: 32px 24px;
            border: 1px solid #eef2f7;
            box-shadow: 0 8px 24px -12px rgba(15, 23, 42, 0.06);
            transition: all .3s ease;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 36px -14px rgba(15, 23, 42, 0.12);
        }
        .step-num {
            width: 44px;
            height: 44px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            background: linear-gradient(135deg, #1a73e8, #0e3d78);
            color: #fff;
            box-shadow: 0 6px 16px -4px rgba(26, 115, 232, 0.45);
        }

        /* ---------- 封面卡片 ---------- */
        .cover-card {
            position: relative;
            border-radius: 22px;
            overflow: hidden;
            background: #fff;
            border: 1px solid #eef2f7;
            box-shadow: 0 10px 30px -15px rgba(15, 23, 42, 0.12);
            transition: all .3s ease;
        }
        .cover-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 24px 45px -18px rgba(15, 23, 42, 0.18);
        }
        .cover-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            transition: transform .45s ease;
        }
        .cover-card:hover img {
            transform: scale(1.04);
        }

        /* ---------- 标签 ---------- */
        .tag-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(26, 115, 232, 0.08);
            color: #1557b0;
            transition: all .25s ease;
        }
        .tag-badge:hover {
            background: rgba(26, 115, 232, 0.14);
        }
        .badge-dark {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.92);
            color: #0e3d78;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
        }

        /* ---------- 文章列表 ---------- */
        .article-item {
            display: flex;
            gap: 16px;
            align-items: center;
            padding: 18px;
            background: #fff;
            border: 1px solid #eef2f7;
            border-radius: 16px;
            transition: all .3s ease;
        }
        .article-item:hover {
            border-color: rgba(26, 115, 232, 0.2);
            box-shadow: 0 12px 28px -12px rgba(15, 23, 42, 0.12);
            transform: translateX(4px);
        }

        /* ---------- FAQ ---------- */
        .faq-item {
            background: #fff;
            border: 1px solid #eef2f7;
            border-radius: 16px;
            overflow: hidden;
            transition: all .3s ease;
        }
        .faq-item.open {
            box-shadow: 0 14px 34px -14px rgba(15, 23, 42, 0.12);
            border-color: rgba(26, 115, 232, 0.2);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: #0c1a2e;
            font-size: 15px;
            transition: color .25s;
        }
        .faq-question:hover {
            color: #1557b0;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }
        .faq-answer-inner {
            padding: 0 24px 22px;
            color: #475569;
            font-size: 14px;
            line-height: 1.8;
        }

        /* ---------- 统计 ---------- */
        .stat-value {
            font-size: 44px;
            font-weight: 800;
            color: #fff;
            line-height: 1.1;
            letter-spacing: -0.02em;
        }
        .stat-label {
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            margin-top: 4px;
        }

        /* ---------- 页脚 ---------- */
        .site-footer {
            background: #081f3d;
            color: #94a3b8;
        }
        .footer-title {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .site-footer a {
            color: #94a3b8;
            transition: color .25s;
        }
        .site-footer a:hover {
            color: #fbbf24;
        }

        /* ---------- 工具类 ---------- */
        .line-clamp-1 {
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        a:focus-visible,
        button:focus-visible {
            outline: 3px solid rgba(251, 191, 36, 0.6);
            outline-offset: 2px;
            border-radius: 8px;
        }

        @media (max-width: 768px) {
            .section {
                padding: 60px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .stat-value {
                font-size: 34px;
            }
        }

/* roulang page: article */
:root {
            --brand-50: #f0f3ff;
            --brand-100: #e6ebfd;
            --brand-200: #c7d1f7;
            --brand-300: #a0b0f0;
            --brand-400: #6d84e0;
            --brand-500: #4c62c8;
            --brand-600: #3a4da8;
            --brand-700: #2f3d87;
            --brand-800: #26336d;
            --brand-900: #1c2755;
            --brand-950: #131b3d;
            --accent-300: #7dd3fc;
            --accent-400: #38bdf8;
            --accent-500: #0ea5e9;
            --slate-50: #f8fafc;
            --slate-100: #f1f5f9;
            --slate-200: #e2e8f0;
            --slate-300: #cbd5e1;
            --slate-400: #94a3b8;
            --slate-500: #64748b;
            --slate-600: #475569;
            --slate-700: #334155;
            --slate-800: #1e293b;
            --slate-900: #0f172a;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 12px 40px rgba(15, 23, 42, 0.12);
            --transition-base: all 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background-color: var(--slate-50);
            color: var(--slate-800);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

        /* ===== Header ===== */
        #siteHeader {
            background: rgba(255, 255, 255, 0.65);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: 0 2px 20px rgba(15, 23, 42, 0.04);
            transition: var(--transition-base);
        }

        #siteHeader.header-scrolled {
            background: rgba(255, 255, 255, 0.92);
            border-bottom-color: rgba(226, 232, 240, 0.9);
            box-shadow: 0 4px 30px rgba(15, 23, 42, 0.08);
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: var(--slate-700);
            transition: var(--transition-base);
            line-height: 1.4;
        }

        .nav-link:hover {
            background: rgba(76, 98, 200, 0.08);
            color: var(--brand-700);
        }

        .nav-link.active {
            background: var(--brand-50);
            color: var(--brand-800);
            font-weight: 600;
        }

        .btn-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 9px 20px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--brand-600), var(--brand-800));
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            box-shadow: 0 4px 16px rgba(44, 61, 135, 0.25);
            transition: var(--transition-base);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .btn-light:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(44, 61, 135, 0.35);
            background: linear-gradient(135deg, var(--brand-700), var(--brand-900));
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--brand-600), var(--brand-800));
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            box-shadow: 0 6px 24px rgba(44, 61, 135, 0.3);
            transition: var(--transition-base);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 32px rgba(44, 61, 135, 0.4);
            background: linear-gradient(135deg, var(--brand-700), var(--brand-900));
        }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.35);
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            font-size: 15px;
            font-weight: 500;
            backdrop-filter: blur(8px);
            transition: var(--transition-base);
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.18);
            border-color: rgba(255, 255, 255, 0.6);
        }

        /* ===== Section ===== */
        .section-title {
            font-size: 30px;
            font-weight: 800;
            color: var(--slate-900);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--slate-500);
            line-height: 1.7;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(4px);
        }

        .badge-brand {
            background: var(--brand-50);
            color: var(--brand-800);
            border-color: var(--brand-200);
        }

        .tag {
            display: inline-flex;
            align-items: center;
            padding: 6px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 500;
            background: var(--slate-100);
            color: var(--slate-600);
            border: 1px solid var(--slate-200);
            transition: var(--transition-base);
        }

        .tag:hover {
            background: var(--brand-50);
            color: var(--brand-700);
            border-color: var(--brand-200);
        }

        /* ===== Card ===== */
        .card {
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--slate-200);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition-base);
        }

        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--brand-200);
        }

        /* ===== Article Content ===== */
        .article-content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--slate-700);
            word-break: break-word;
        }

        .article-content > *:first-child {
            margin-top: 0;
        }

        .article-content > *:last-child {
            margin-bottom: 0;
        }

        .article-content h1,
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            color: var(--slate-900);
            font-weight: 700;
            line-height: 1.4;
            margin-top: 1.6em;
            margin-bottom: 0.7em;
        }

        .article-content h1 {
            font-size: 28px;
        }

        .article-content h2 {
            font-size: 24px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--brand-100);
        }

        .article-content h3 {
            font-size: 19px;
        }

        .article-content h4 {
            font-size: 17px;
        }

        .article-content p {
            margin-bottom: 1.2em;
        }

        .article-content a {
            color: var(--brand-600);
            text-decoration: underline;
            text-decoration-color: var(--brand-200);
            text-underline-offset: 4px;
            text-decoration-thickness: 2px;
        }

        .article-content a:hover {
            color: var(--brand-800);
            text-decoration-color: var(--brand-400);
        }

        .article-content ul,
        .article-content ol {
            padding-left: 1.6em;
            margin-bottom: 1.2em;
        }

        .article-content ul {
            list-style: disc;
        }

        .article-content ol {
            list-style: decimal;
        }

        .article-content li {
            margin-top: 6px;
            padding-left: 4px;
        }

        .article-content blockquote {
            border-left: 4px solid var(--brand-500);
            background: var(--brand-50);
            padding: 18px 22px;
            border-radius: 0 14px 14px 0;
            color: var(--slate-600);
            margin: 1.4em 0;
            font-style: normal;
        }

        .article-content blockquote p {
            margin-bottom: 0;
        }

        .article-content img {
            border-radius: 14px;
            max-width: 100%;
            margin: 1.4em 0;
            box-shadow: var(--shadow-card);
        }

        .article-content table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--slate-200);
            margin: 1.4em 0;
            font-size: 15px;
        }

        .article-content table th {
            background: var(--brand-50);
            padding: 12px 16px;
            font-weight: 600;
            text-align: left;
            border-bottom: 1px solid var(--slate-200);
            color: var(--slate-800);
        }

        .article-content table td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--slate-100);
        }

        .article-content table tr:last-child td {
            border-bottom: none;
        }

        .article-content code {
            background: var(--slate-100);
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 14px;
            font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
            color: var(--brand-700);
        }

        .article-content pre {
            background: var(--slate-900);
            color: var(--slate-100);
            padding: 20px 24px;
            border-radius: 14px;
            overflow-x: auto;
            margin: 1.4em 0;
            line-height: 1.7;
            font-size: 14px;
        }

        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        .article-content hr {
            border: none;
            border-top: 1px solid var(--slate-200);
            margin: 2em 0;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: linear-gradient(180deg, var(--brand-900) 0%, var(--brand-950) 100%);
        }

        .site-footer a {
            color: var(--slate-400);
        }

        .site-footer a:hover {
            color: var(--accent-400);
        }

        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.04em;
            margin-bottom: 16px;
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: #fff;
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            transition: var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--brand-200);
            box-shadow: 0 4px 16px rgba(15, 23, 42, 0.05);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            font-weight: 600;
            font-size: 15px;
            color: var(--slate-800);
            cursor: pointer;
            user-select: none;
        }

        .faq-answer {
            padding: 0 22px 18px;
            font-size: 14px;
            color: var(--slate-600);
            line-height: 1.75;
        }

        /* ===== Back to top ===== */
        .back-to-top {
            position: fixed;
            right: 28px;
            bottom: 28px;
            z-index: 99;
            width: 46px;
            height: 46px;
            border-radius: 14px;
            background: var(--brand-700);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 24px rgba(44, 61, 135, 0.35);
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            transition: var(--transition-base);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .back-to-top.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }

        .back-to-top:hover {
            background: var(--brand-800);
            transform: translateY(-4px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .section-title {
                font-size: 26px;
            }
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 23px;
            }

            .article-content {
                font-size: 15px;
                line-height: 1.8;
            }

            .article-content h2 {
                font-size: 21px;
            }

            .article-content h3 {
                font-size: 17px;
            }

            .btn-primary {
                padding: 10px 22px;
                font-size: 14px;
            }

            .back-to-top {
                right: 20px;
                bottom: 20px;
                width: 40px;
                height: 40px;
                border-radius: 12px;
            }
        }

        @media (max-width: 520px) {
            .faq-question {
                padding: 16px 16px;
                font-size: 14px;
            }

            .faq-answer {
                padding: 0 16px 14px;
                font-size: 13px;
            }

            .badge {
                font-size: 12px;
                padding: 4px 10px;
            }
        }

        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .map-mask {
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, rgba(19, 27, 61, 0.55), rgba(19, 27, 61, 0.85));
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.14);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.28);
            backdrop-filter: blur(6px);
        }