/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1e3a5f;
            --primary-light: #2a5298;
            --primary-dark: #0f2440;
            --accent: #e8a838;
            --accent-light: #f0c060;
            --accent-dark: #c48a2a;
            --highlight: #ff6b35;
            --bg-body: #f4f6fb;
            --bg-card: #ffffff;
            --bg-dark: #132033;
            --text-dark: #1a1a2e;
            --text-body: #2d3748;
            --text-muted: #6c757d;
            --text-light: #a0aec0;
            --text-white: #f8f9fc;
            --border-light: #e2e8f0;
            --border-card: #edf2f7;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 16px rgba(0,0,0,0.06);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 260px;
            --nav-bg: #0f2440;
            --nav-text: #c8d6e5;
            --nav-active: #e8a838;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-dark); line-height: 1.3; font-weight: 700; }
        h1 { font-size: 2.6rem; }
        h2 { font-size: 2.0rem; margin-bottom: 1.2rem; }
        h3 { font-size: 1.4rem; }
        p { margin-bottom: 1rem; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

        /* ===== 应用布局 ===== */
        .app-layout {
            display: flex;
            min-height: 100vh;
        }

        /* ===== 侧边导航 ===== */
        .sidebar {
            width: var(--sidebar-width);
            background: var(--nav-bg);
            color: var(--nav-text);
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            overflow-y: auto;
            padding: 0;
            transition: transform var(--transition);
        }
        .sidebar-brand {
            padding: 28px 20px 18px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .sidebar-brand .logo-text {
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-brand .logo-text i {
            color: var(--accent);
            font-size: 1.6rem;
        }
        .sidebar-brand .logo-sub {
            font-size: 0.72rem;
            color: var(--text-light);
            margin-top: 4px;
            letter-spacing: 2px;
            opacity: 0.7;
        }
        .sidebar-nav {
            padding: 16px 0;
            flex: 1;
        }
        .sidebar-nav .nav-section {
            padding: 8px 20px 4px;
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: rgba(255,255,255,0.3);
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 20px;
            color: var(--nav-text);
            font-size: 0.95rem;
            font-weight: 500;
            border-left: 3px solid transparent;
            transition: var(--transition);
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            color: rgba(255,255,255,0.4);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255,255,255,0.04);
            color: #fff;
            border-left-color: var(--accent);
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: rgba(232,168,56,0.08);
            color: var(--accent);
            border-left-color: var(--accent);
            font-weight: 600;
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }
        .sidebar-footer {
            padding: 20px;
            border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 0.75rem;
            color: var(--text-light);
            text-align: center;
        }
        .sidebar-footer .social-links {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-bottom: 10px;
        }
        .sidebar-footer .social-links a {
            color: var(--text-light);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .sidebar-footer .social-links a:hover {
            color: var(--accent);
        }

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

        /* ===== 移动端顶部栏 ===== */
        .mobile-topbar {
            display: none;
            background: var(--nav-bg);
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .mobile-topbar .logo-text {
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .mobile-topbar .logo-text i {
            color: var(--accent);
        }
        .mobile-topbar .hamburger {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
        }
        .mobile-overlay.open { display: block; }
        .sidebar.open { transform: translateX(0); }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: var(--bg-dark) url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            padding: 80px 24px;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,36,64,0.85) 0%, rgba(30,58,95,0.70) 100%);
            z-index: 1;
        }
        .hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            color: var(--text-white);
        }
        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 0.8rem;
            letter-spacing: 1px;
            text-shadow: 0 2px 20px rgba(0,0,0,0.3);
        }
        .hero .hero-sub {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.85);
            margin-bottom: 2rem;
            line-height: 1.8;
            max-width: 650px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero .hero-badge {
            display: inline-block;
            background: var(--accent);
            color: var(--bg-dark);
            padding: 6px 20px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 1px;
            margin-bottom: 1.2rem;
            text-transform: uppercase;
        }
        .hero .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        .hero .btn-group .btn {
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .hero .btn-group .btn-primary {
            background: var(--accent);
            color: var(--bg-dark);
        }
        .hero .btn-group .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(232,168,56,0.4);
        }
        .hero .btn-group .btn-outline {
            background: transparent;
            border: 2px solid rgba(255,255,255,0.5);
            color: #fff;
        }
        .hero .btn-group .btn-outline:hover {
            border-color: var(--accent);
            background: rgba(232,168,56,0.12);
            transform: translateY(-2px);
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background: var(--bg-card);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3 {
            color: #fff;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            position: relative;
            display: inline-block;
            margin-bottom: 0.5rem;
        }
        .section-header h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background: var(--accent);
            margin: 12px auto 0;
            border-radius: 3px;
        }
        .section-header p {
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-dark .section-header p {
            color: var(--text-light);
        }

        /* ===== 卡片系统 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-card);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card .card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-light);
        }
        .card .card-body {
            padding: 24px;
        }
        .card .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 0.5rem;
        }
        .card .card-body p {
            color: var(--text-muted);
            font-size: 0.92rem;
            margin-bottom: 0.6rem;
        }
        .card .card-body .card-meta {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .card .card-body .card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .card .card-body .card-tag {
            display: inline-block;
            background: rgba(232,168,56,0.12);
            color: var(--accent-dark);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .card-alt {
            background: transparent;
            border: 1px solid var(--border-light);
            box-shadow: none;
        }
        .card-alt:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
        }

        /* ===== 特性/卖点卡片 ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-card);
            transition: var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
        }
        .feature-card .icon-wrap {
            width: 64px;
            height: 64px;
            margin: 0 auto 16px;
            background: rgba(232,168,56,0.08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--accent);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            margin-bottom: 0.6rem;
        }
        .feature-card p {
            color: var(--text-muted);
            font-size: 0.92rem;
            margin-bottom: 0;
        }

        /* ===== 图文展示 ===== */
        .showcase-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .showcase-grid .showcase-image {
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            overflow: hidden;
        }
        .showcase-grid .showcase-image img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            display: block;
        }
        .showcase-grid .showcase-text h3 {
            font-size: 1.6rem;
            margin-bottom: 1rem;
        }
        .showcase-grid .showcase-text p {
            color: var(--text-muted);
            font-size: 1rem;
        }
        .showcase-grid .showcase-text .btn {
            margin-top: 0.8rem;
        }

        /* ===== 资讯列表 (CMS) ===== */
        .news-list .news-item {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .news-list .news-item:last-child {
            border-bottom: none;
        }
        .news-list .news-item:hover {
            padding-left: 8px;
        }
        .news-list .news-item .news-thumb {
            width: 160px;
            min-height: 110px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--border-light);
        }
        .news-list .news-item .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-list .news-item .news-info {
            flex: 1;
        }
        .news-list .news-item .news-info h3 {
            font-size: 1.1rem;
            margin-bottom: 0.3rem;
            font-weight: 600;
        }
        .news-list .news-item .news-info h3 a {
            color: var(--text-dark);
        }
        .news-list .news-item .news-info h3 a:hover {
            color: var(--accent);
        }
        .news-list .news-item .news-info .news-excerpt {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 0.4rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-list .news-item .news-info .news-meta {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .news-list .news-item .news-info .news-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .news-empty {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-light);
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255,255,255,0.04);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.06);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255,255,255,0.08);
            transform: translateY(-3px);
        }
        .stat-item .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 6px;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-card);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-item .faq-question::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            color: var(--text-muted);
            transition: var(--transition);
            font-size: 1.1rem;
        }
        .faq-item .faq-question.open::after {
            transform: rotate(180deg);
        }
        .faq-item .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.8;
            display: none;
        }
        .faq-item .faq-answer.open {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-box {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-box > * { position: relative; z-index: 1; }
        .cta-box h2 {
            color: #fff;
            font-size: 2rem;
            margin-bottom: 0.8rem;
        }
        .cta-box p {
            color: rgba(255,255,255,0.8);
            max-width: 600px;
            margin: 0 auto 1.8rem;
            font-size: 1.05rem;
        }
        .cta-box .btn {
            display: inline-block;
            padding: 16px 44px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            background: var(--accent);
            color: var(--bg-dark);
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .cta-box .btn:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(232,168,56,0.35);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-light);
            padding: 48px 24px 24px;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
        }
        .footer-inner h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 1rem;
            font-weight: 600;
        }
        .footer-inner p, .footer-inner a {
            font-size: 0.88rem;
            color: var(--text-light);
            line-height: 1.8;
        }
        .footer-inner a:hover {
            color: var(--accent);
        }
        .footer-inner .footer-brand .logo-text {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 0.6rem;
        }
        .footer-inner .footer-brand .logo-text i {
            color: var(--accent);
        }
        .footer-inner .footer-links li {
            margin-bottom: 6px;
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 32px auto 0;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.06);
            text-align: center;
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* ===== 按钮通用 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.92rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--bg-dark);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(232,168,56,0.3);
            color: var(--bg-dark);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.82rem;
        }

        /* ===== 标签/徽章 ===== */
        .tag {
            display: inline-block;
            padding: 3px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(232,168,56,0.10);
            color: var(--accent-dark);
            border: 1px solid rgba(232,168,56,0.15);
        }
        .tag-blue {
            background: rgba(30,58,95,0.08);
            color: var(--primary);
            border-color: rgba(30,58,95,0.12);
        }

        /* ===== 分割线 ===== */
        .divider {
            height: 1px;
            background: var(--border-light);
            margin: 0;
            border: none;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .feature-grid { grid-template-columns: repeat(2, 1fr); }
            .showcase-grid { grid-template-columns: 1fr; }
            .showcase-grid .showcase-image img { height: 280px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-inner { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-topbar {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .hero { min-height: 400px; padding: 60px 20px; }
            .hero h1 { font-size: 1.8rem; }
            .hero .hero-sub { font-size: 1rem; }
            .section { padding: 48px 0; }
            .section-header { margin-bottom: 32px; }
            h2 { font-size: 1.6rem; }
            .feature-grid { grid-template-columns: 1fr; gap: 20px; }
            .news-list .news-item { flex-direction: column; gap: 12px; }
            .news-list .news-item .news-thumb { width: 100%; height: 180px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .stat-item .stat-number { font-size: 2.2rem; }
            .cta-box { padding: 40px 24px; }
            .cta-box h2 { font-size: 1.5rem; }
            .footer-inner { grid-template-columns: 1fr; gap: 28px; }
            .faq-item .faq-question { font-size: 0.92rem; padding: 14px 18px; }
            .faq-item .faq-answer { padding: 0 18px 14px; }
        }

        @media (max-width: 480px) {
            .hero h1 { font-size: 1.5rem; }
            .hero .hero-sub { font-size: 0.92rem; }
            .hero .btn-group .btn { padding: 12px 24px; font-size: 0.85rem; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-item { padding: 20px 12px; }
            .stat-item .stat-number { font-size: 1.8rem; }
            .container { padding: 0 16px; }
        }

        /* ===== 辅助类 ===== */
        .text-center { text-align: center; }
        .mt-1 { margin-top: 1rem; }
        .mt-2 { margin-top: 2rem; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .gap-1 { gap: 1rem; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

        /* Foundation 覆盖 */
        .grid-container { max-width: 1200px; padding-left: 24px; padding-right: 24px; }
        .cell h3 { font-size: 1.15rem; }
        .button { border-radius: 50px; font-weight: 600; transition: var(--transition); }
        .button.hollow { border-width: 2px; }
        .card { border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--border-card); }
        .card-section { padding: 24px; }
        .card-section h3 { font-size: 1.15rem; }
        .card-section p { color: var(--text-muted); font-size: 0.92rem; }

/* roulang page: article */
:root {
            --primary: #e63946;
            --primary-dark: #c1121f;
            --primary-light: #ff6b6b;
            --secondary: #1d3557;
            --secondary-light: #457b9d;
            --accent: #f4a261;
            --bg-dark: #0d1b2a;
            --bg-sidebar: #1b2a41;
            --bg-body: #f5f7fa;
            --bg-card: #ffffff;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-light: #8a8aaa;
            --text-white: #ffffff;
            --border-light: #e8ecf0;
            --border-card: #e2e6ea;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --sidebar-width: 240px;
            --header-height: 0px;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

        button, .button {
            cursor: pointer;
            font-family: var(--font-sans);
            transition: var(--transition);
        }
        button:focus-visible, .button:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }

        ul, ol { list-style: none; }

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

        .sidebar {
            width: var(--sidebar-width);
            background: var(--bg-sidebar);
            color: var(--text-white);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            border-right: 1px solid rgba(255,255,255,0.06);
            transition: var(--transition);
            overflow-y: auto;
        }

        .sidebar-brand {
            padding: 28px 20px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .sidebar-brand .logo-text {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-brand .logo-text i {
            color: var(--primary);
            font-size: 1.5rem;
        }
        .sidebar-brand .logo-sub {
            font-size: 0.75rem;
            color: rgba(255,255,255,0.5);
            margin-top: 4px;
            letter-spacing: 1px;
        }

        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
        }

        .sidebar-nav .nav-section {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: rgba(255,255,255,0.35);
            padding: 12px 12px 8px;
            font-weight: 600;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 11px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-size: 0.9rem;
            font-weight: 500;
            transition: var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: rgba(255,255,255,0.4);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255,255,255,0.08);
            color: var(--text-white);
        }
        .sidebar-nav a:hover i {
            color: var(--primary-light);
        }
        .sidebar-nav a.active {
            background: rgba(230,57,70,0.2);
            color: var(--text-white);
            border-left: 3px solid var(--primary);
        }
        .sidebar-nav a.active i {
            color: var(--primary-light);
        }

        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* Page Header */
        .page-header {
            background: linear-gradient(135deg, var(--secondary) 0%, var(--bg-dark) 100%);
            padding: 48px 0 40px;
            position: relative;
            overflow: hidden;
        }
        .page-header::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .page-header .container {
            position: relative;
            z-index: 1;
        }
        .page-header h1 {
            color: var(--text-white);
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 10px;
            max-width: 800px;
        }
        .page-header .article-meta {
            color: rgba(255,255,255,0.7);
            font-size: 0.85rem;
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 8px;
        }
        .page-header .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .page-header .article-meta i {
            color: var(--primary-light);
        }

        /* Article Body */
        .article-section {
            padding: 48px 0 60px;
        }
        .article-body {
            max-width: 820px;
            margin: 0 auto;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            padding: 40px 48px;
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-primary);
        }
        .article-body .content p {
            margin-bottom: 1.2em;
        }
        .article-body .content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--secondary);
        }
        .article-body .content h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-top: 1.5em;
            margin-bottom: 0.5em;
            color: var(--secondary);
        }
        .article-body .content ul, .article-body .content ol {
            margin: 1em 0;
            padding-left: 1.5em;
        }
        .article-body .content li {
            margin-bottom: 0.4em;
            list-style: disc;
        }
        .article-body .content a {
            color: var(--primary);
            border-bottom: 1px solid transparent;
        }
        .article-body .content a:hover {
            border-bottom-color: var(--primary);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: #fef2f2;
            padding: 12px 20px;
            margin: 1.2em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content img {
            margin: 1.5em auto;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }

        .not-found-box {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
        }
        .not-found-box i {
            font-size: 3rem;
            color: var(--text-light);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 1.5rem;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-light);
            margin-bottom: 24px;
        }
        .not-found-box .button {
            display: inline-block;
            padding: 12px 32px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: var(--radius-sm);
            font-weight: 600;
        }
        .not-found-box .button:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.8);
            padding: 48px 0 0;
            margin-top: auto;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
        }
        .footer-brand .logo-text {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand .logo-text i {
            color: var(--primary);
        }
        .footer-brand p {
            font-size: 0.85rem;
            line-height: 1.7;
            color: rgba(255,255,255,0.55);
            max-width: 360px;
        }
        .site-footer h4 {
            color: var(--text-white);
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.6);
            font-size: 0.85rem;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }
        .footer-links i {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.3);
        }
        .footer-bottom {
            margin-top: 40px;
            padding: 20px 24px;
            border-top: 1px solid rgba(255,255,255,0.06);
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.35);
        }

        /* Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Mobile toggle */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 1.5rem;
            padding: 8px 12px;
            cursor: pointer;
            position: fixed;
            top: 12px;
            left: 12px;
            z-index: 1100;
            background: var(--bg-sidebar);
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-md);
        }
        .mobile-menu-toggle:focus-visible {
            outline: 3px solid var(--primary-light);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
        }

        /* Responsive */
        @media screen and (max-width: 1024px) {
            .article-body {
                padding: 32px 28px;
            }
        }

        @media screen and (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.open {
                display: block;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .page-header h1 {
                font-size: 1.5rem;
            }
            .page-header {
                padding: 36px 0 30px;
            }
            .article-body {
                padding: 24px 18px;
                border-radius: var(--radius-sm);
            }
            .article-body .content {
                font-size: 1rem;
            }
            .article-section {
                padding: 28px 0 40px;
            }
        }

        @media screen and (max-width: 520px) {
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .sidebar-brand {
                padding: 20px 16px 16px;
            }
            .sidebar-brand .logo-text {
                font-size: 1.1rem;
            }
            .sidebar-nav a {
                padding: 10px 14px;
                font-size: 0.85rem;
            }
            .page-header h1 {
                font-size: 1.25rem;
            }
            .page-header .article-meta {
                font-size: 0.78rem;
                gap: 12px;
                flex-wrap: wrap;
            }
            .article-body {
                padding: 18px 14px;
            }
            .not-found-box {
                padding: 48px 16px;
            }
            .not-found-box h2 {
                font-size: 1.2rem;
            }
        }

        /* Breadcrumb helper */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.6);
            margin-bottom: 12px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: rgba(255,255,255,0.7);
        }
        .breadcrumb a:hover {
            color: var(--text-white);
        }
        .breadcrumb i {
            font-size: 0.6rem;
            color: rgba(255,255,255,0.3);
        }
        .breadcrumb span {
            color: var(--primary-light);
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #e63946;
            --primary-dark: #c1121f;
            --primary-light: #ff6b6b;
            --secondary: #1d3557;
            --secondary-light: #457b9d;
            --accent: #f4a261;
            --bg-body: #f8f9fa;
            --bg-card: #ffffff;
            --bg-dark: #0b1a2e;
            --bg-section-alt: #f1f4f8;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-light: #8a8aaa;
            --text-white: #f8f9fa;
            --border-color: #e2e6ef;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.10);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.14);
            --transition: all 0.30s cubic-bezier(0.4,0,0.2,1);
            --nav-width: 240px;
            --header-height: 0px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-left: var(--nav-width);
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover, a:focus { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        h1 { font-size: 2.8rem; letter-spacing: -0.02em; }
        h2 { font-size: 2.0rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.4rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

        /* ===== 左侧竖向导航 ===== */
        .sidebar {
            position: fixed;
            top: 0; left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--bg-dark);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            border-right: 1px solid rgba(255,255,255,0.06);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }
        .sidebar-brand {
            padding: 28px 20px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .sidebar-brand .logo-text {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-brand .logo-text i { color: var(--primary-light); font-size: 1.4rem; }
        .sidebar-brand .logo-sub {
            font-size: 0.75rem;
            color: rgba(255,255,255,0.5);
            margin-top: 4px;
            letter-spacing: 1px;
        }
        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
        }
        .sidebar-nav .nav-section {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: rgba(255,255,255,0.35);
            padding: 12px 12px 6px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 11px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i { width: 20px; text-align: center; font-size: 1rem; color: rgba(255,255,255,0.4); transition: var(--transition); }
        .sidebar-nav a:hover { background: rgba(255,255,255,0.08); color: #fff; }
        .sidebar-nav a:hover i { color: var(--primary-light); }
        .sidebar-nav a.active {
            background: rgba(230,57,70,0.20);
            color: #fff;
            border-left: 3px solid var(--primary);
        }
        .sidebar-nav a.active i { color: var(--primary-light); }
        .sidebar-footer-nav {
            padding: 16px 12px 24px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .sidebar-footer-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.45);
            font-size: 0.82rem;
            transition: var(--transition);
        }
        .sidebar-footer-nav a:hover { color: rgba(255,255,255,0.8); background: rgba(255,255,255,0.05); }

        /* ===== 主内容区 ===== */
        .main-content {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== 顶部工具栏（移动端显示） ===== */
        .topbar {
            display: none;
            background: var(--bg-dark);
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 999;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .topbar .logo-text { color: #fff; font-weight: 700; font-size: 1.1rem; display: flex; align-items: center; gap: 8px; }
        .topbar .logo-text i { color: var(--primary-light); }
        .menu-toggle { background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; padding: 4px 8px; border-radius: 6px; }
        .menu-toggle:hover { background: rgba(255,255,255,0.1); }

        /* ===== Hero 区域 ===== */
        .hero-section {
            position: relative;
            padding: 80px 0 100px;
            background: linear-gradient(135deg, #0b1a2e 0%, #1a2a44 60%, #2a3a5e 100%);
            overflow: hidden;
            min-height: 480px;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0; right: 0;
            height: 80px;
            background: linear-gradient(to top, var(--bg-body), transparent);
        }
        .hero-content { position: relative; z-index: 2; max-width: 780px; }
        .hero-section h1 {
            color: #fff;
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
        }
        .hero-section h1 span { color: var(--primary-light); }
        .hero-section .hero-sub {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.75);
            margin-bottom: 32px;
            max-width: 620px;
            line-height: 1.7;
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 28px;
        }
        .hero-tags .tag {
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(4px);
            padding: 6px 18px;
            border-radius: 30px;
            color: rgba(255,255,255,0.9);
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid rgba(255,255,255,0.15);
            transition: var(--transition);
        }
        .hero-tags .tag:hover { background: rgba(255,255,255,0.20); }
        .hero-cta-group { display: flex; flex-wrap: wrap; gap: 14px; }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            line-height: 1.2;
        }
        .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 16px rgba(230,57,70,0.35); }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(230,57,70,0.45); color: #fff; }
        .btn-outline-light { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.35); }
        .btn-outline-light:hover { background: rgba(255,255,255,0.10); border-color: #fff; transform: translateY(-2px); color: #fff; }

        /* ===== 通用板块 ===== */
        .section-block { padding: 80px 0; }
        .section-block-alt { background: var(--bg-section-alt); }
        .section-title { text-align: center; margin-bottom: 56px; }
        .section-title h2 { position: relative; display: inline-block; }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--primary);
            border-radius: 4px;
            margin: 16px auto 0;
        }
        .section-title p { max-width: 640px; margin: 16px auto 0; font-size: 1.05rem; color: var(--text-light); }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3,1fr);
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        .card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
        .card-image { position: relative; overflow: hidden; aspect-ratio: 16/10; }
        .card-image img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
        .card:hover .card-image img { transform: scale(1.05); }
        .card-image .card-tag {
            position: absolute;
            top: 14px; left: 14px;
            background: var(--primary);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            letter-spacing: 0.3px;
        }
        .card-body { padding: 22px 24px 24px; flex: 1; display: flex; flex-direction: column; }
        .card-body h3 { font-size: 1.15rem; margin-bottom: 8px; }
        .card-body h3 a { color: var(--text-primary); }
        .card-body h3 a:hover { color: var(--primary); }
        .card-body p { font-size: 0.92rem; color: var(--text-secondary); flex: 1; margin-bottom: 16px; }
        .card-meta { display: flex; align-items: center; gap: 16px; font-size: 0.82rem; color: var(--text-light); border-top: 1px solid var(--border-color); padding-top: 14px; }
        .card-meta i { margin-right: 4px; }

        /* ===== 图文混合区块 ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2,1fr);
            gap: 40px;
            align-items: center;
        }
        .feature-image { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); }
        .feature-image img { width: 100%; display: block; }
        .feature-text h3 { font-size: 1.6rem; margin-bottom: 16px; }
        .feature-text ul { margin-top: 16px; }
        .feature-text ul li { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; font-size: 0.98rem; color: var(--text-secondary); }
        .feature-text ul li i { color: var(--primary); margin-top: 4px; font-size: 1rem; min-width: 20px; }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4,1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-item { padding: 32px 16px; background: var(--bg-card); border-radius: var(--radius); box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); transition: var(--transition); }
        .stat-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .stat-number { font-size: 2.6rem; font-weight: 800; color: var(--primary); line-height: 1.2; }
        .stat-label { font-size: 0.95rem; color: var(--text-secondary); margin-top: 6px; font-weight: 500; }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3,1fr);
            gap: 32px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            text-align: center;
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -14px; left: 50%;
            transform: translateX(-50%);
            background: var(--primary);
            color: #fff;
            width: 36px; height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 4px 12px rgba(230,57,70,0.30);
        }
        .step-item .step-icon { font-size: 2rem; color: var(--primary); margin-bottom: 16px; margin-top: 8px; }
        .step-item h4 { margin-bottom: 8px; font-size: 1.1rem; }
        .step-item p { font-size: 0.90rem; color: var(--text-light); margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 820px; margin: 0 auto; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-sm); }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.02rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question i { color: var(--primary); transition: var(--transition); font-size: 1.1rem; }
        .faq-question[aria-expanded="true"] i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }
        .faq-answer.show { display: block; }

        /* ===== CTA 区域 ===== */
        .cta-section {
            background: linear-gradient(135deg, #0b1a2e 0%, #1d3557 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            opacity: 0.10;
            mix-blend-mode: overlay;
        }
        .cta-content { position: relative; z-index: 2; max-width: 640px; margin: 0 auto; }
        .cta-content h2 { color: #fff; font-size: 2.2rem; margin-bottom: 16px; }
        .cta-content p { color: rgba(255,255,255,0.7); font-size: 1.1rem; margin-bottom: 32px; }
        .cta-content .btn-primary { font-size: 1.1rem; padding: 16px 44px; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 24px 30px;
            margin-top: auto;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
        }
        .footer-brand .logo-text { font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
        .footer-brand .logo-text i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.90rem; color: rgba(255,255,255,0.55); line-height: 1.8; }
        .site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a { color: rgba(255,255,255,0.55); font-size: 0.90rem; transition: var(--transition); display: flex; align-items: center; gap: 8px; }
        .footer-links a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-bottom {
            max-width: 1200px;
            margin: 40px auto 0;
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.08);
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .card-grid { grid-template-columns: repeat(2,1fr); }
            .stats-grid { grid-template-columns: repeat(2,1fr); }
            .steps-grid { grid-template-columns: repeat(2,1fr); }
            .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
        }

        @media (max-width: 768px) {
            body { padding-left: 0; }
            .sidebar { transform: translateX(-100%); transition: var(--transition); }
            .sidebar.open { transform: translateX(0); }
            .topbar { display: flex; }
            .main-content { width: 100%; }
            .hero-section { padding: 60px 0 80px; min-height: auto; }
            .hero-section h1 { font-size: 2.0rem; }
            .hero-section .hero-sub { font-size: 1rem; }
            .feature-grid { grid-template-columns: 1fr; gap: 28px; }
            .card-grid { grid-template-columns: 1fr; gap: 20px; }
            .stats-grid { grid-template-columns: repeat(2,1fr); gap: 16px; }
            .steps-grid { grid-template-columns: 1fr; gap: 24px; }
            .section-block { padding: 56px 0; }
            .footer-inner { grid-template-columns: 1fr; gap: 28px; }
            .footer-inner > div:first-child { order: 3; }
            .cta-content h2 { font-size: 1.6rem; }
            .section-title h2 { font-size: 1.6rem; }
            .stat-number { font-size: 2rem; }
            .hero-tags .tag { font-size: 0.78rem; padding: 4px 14px; }
            .btn { padding: 12px 26px; font-size: 0.92rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero-section h1 { font-size: 1.6rem; }
            .hero-section .hero-sub { font-size: 0.92rem; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-item { padding: 20px 12px; }
            .stat-number { font-size: 1.6rem; }
            .card-body { padding: 16px 18px 20px; }
            .faq-question { padding: 14px 18px; font-size: 0.95rem; }
            .faq-answer { padding: 0 18px 14px; }
            .footer-inner { gap: 20px; }
            .hero-cta-group { flex-direction: column; }
            .hero-cta-group .btn { width: 100%; justify-content: center; }
        }

        /* ===== 移动端遮罩 ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
        }
        .sidebar-overlay.active { display: block; }

        /* ===== 工具 ===== */
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-1 { margin-top: 1rem; }
        .mt-2 { margin-top: 2rem; }
        .gap-1 { gap: 1rem; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

        /* Foundation 覆盖 */
        .grid-container { max-width: 1200px; padding-left: 24px; padding-right: 24px; }
        @media (max-width: 768px) { .grid-container { padding-left: 16px; padding-right: 16px; } }