/* roulang page: index */
/* ============ 设计变量 ============ */
        :root {
            --primary: #5B6DF5;
            --primary-dark: #4455E0;
            --primary-light: #EEF1FE;
            --accent: #8B5CF6;
            --accent-light: #F3EEFF;
            --bg: #F7F9FF;
            --card-bg: #FFFFFF;
            --text: #1B2333;
            --text-light: #667085;
            --border: #E4E9F2;
            --radius: 18px;
            --radius-sm: 12px;
            --radius-xs: 8px;
            --shadow: 0 8px 30px rgba(91, 109, 245, 0.08);
            --shadow-md: 0 14px 44px rgba(91, 109, 245, 0.14);
            --shadow-lg: 0 24px 60px rgba(91, 109, 245, 0.18);
            --sidebar-width: 250px;
            --transition: all 0.3s ease;
        }

        /* ============ 基础 Reset ============ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        a:focus-visible,
        button:focus-visible,
        summary:focus-visible {
            outline: 3px solid rgba(91, 109, 245, 0.4);
            outline-offset: 3px;
            border-radius: 6px;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ============ 容器 ============ */
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 30px;
            width: 100%;
        }
        .section {
            padding: 90px 0;
        }

        /* ============ 左侧竖向导航 ============ */
        .site-wrapper {
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            width: var(--sidebar-width);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            background: var(--card-bg);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            padding: 30px 22px 24px;
            z-index: 200;
            transition: transform 0.35s ease;
        }
        .sidebar .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 6px 8px 24px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 24px;
        }
        .brand-icon {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            flex-shrink: 0;
            box-shadow: 0 6px 16px rgba(91, 109, 245, 0.3);
        }
        .brand-name {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.3;
            letter-spacing: 0.2px;
        }
        .brand-name small {
            display: block;
            font-size: 12px;
            color: var(--text-light);
            font-weight: 400;
            margin-top: 2px;
        }
        .side-nav {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .side-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 13px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
        }
        .side-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 16px;
        }
        .side-nav .nav-link:hover {
            background: var(--primary-light);
            color: var(--primary);
            transform: translateX(3px);
        }
        .side-nav .nav-link.active {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            box-shadow: 0 8px 20px rgba(91, 109, 245, 0.25);
        }
        .sidebar-footer {
            border-top: 1px solid var(--border);
            padding-top: 18px;
            text-align: center;
        }
        .sidebar-footer .help-chip {
            display: inline-block;
            background: var(--accent-light);
            color: var(--accent);
            font-size: 12px;
            font-weight: 600;
            padding: 7px 16px;
            border-radius: 30px;
        }
        .sidebar-footer p {
            font-size: 12px;
            color: var(--text-light);
            margin-top: 12px;
            line-height: 1.5;
        }

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

        /* ============ 移动端顶部导航 ============ */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 300;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            padding: 14px 22px;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--border);
        }
        .mobile-header .brand-mobile {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .mobile-header .brand-mobile .brand-icon {
            width: 34px;
            height: 34px;
            font-size: 14px;
            border-radius: 10px;
        }
        .mobile-header .brand-mobile span {
            font-weight: 700;
            font-size: 16px;
        }
        .menu-toggle {
            width: 40px;
            height: 40px;
            border: none;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 10px;
            font-size: 17px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: var(--primary);
            color: #fff;
        }
        .mobile-menu {
            display: none;
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
            padding: 10px 20px 14px;
            box-shadow: var(--shadow);
        }
        .mobile-menu .nav-link {
            display: block;
            padding: 12px 14px;
            border-radius: var(--radius-xs);
            color: var(--text-light);
            font-weight: 500;
            font-size: 15px;
            border-left: 3px solid transparent;
        }
        .mobile-menu .nav-link.active {
            background: var(--primary-light);
            color: var(--primary);
            border-left-color: var(--primary);
            font-weight: 600;
        }
        .mobile-menu .nav-link:hover {
            background: var(--primary-light);
        }

        /* ============ Hero 首屏 ============ */
        .hero {
            position: relative;
            padding: 110px 0 100px;
            background: linear-gradient(135deg, rgba(70, 85, 220, 0.94) 0%, rgba(124, 92, 245, 0.88) 60%, rgba(155, 120, 255, 0.7) 100%),
                url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            color: #fff;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
            box-shadow: 0 0 0 60px rgba(255, 255, 255, 0.03);
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: 30%;
            width: 260px;
            height: 260px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.18);
            border: 1px solid rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(8px);
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.5px;
            margin-bottom: 28px;
        }
        .hero h1 {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 14px;
            letter-spacing: 1px;
        }
        .hero-subtitle {
            font-size: 21px;
            font-weight: 600;
            opacity: 0.95;
            margin-bottom: 16px;
            letter-spacing: 2px;
        }
        .hero-desc {
            font-size: 16px;
            max-width: 640px;
            line-height: 1.8;
            opacity: 0.85;
            margin-bottom: 34px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 52px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 28px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn-primary {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
            color: var(--primary-dark);
        }
        .btn-ghost {
            background: transparent;
            color: #fff;
            border: 1.5px solid rgba(255, 255, 255, 0.6);
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            transform: translateY(-2px);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            padding-top: 36px;
            border-top: 1px solid rgba(255, 255, 255, 0.18);
        }
        .stat-item strong {
            display: block;
            font-size: 30px;
            font-weight: 800;
            line-height: 1.2;
        }
        .stat-item span {
            font-size: 13px;
            opacity: 0.75;
            letter-spacing: 1px;
        }

        /* ============ 板块通用 ============ */
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 54px;
        }
        .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 700;
            padding: 6px 18px;
            border-radius: 30px;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }
        .section-header h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-light);
            line-height: 1.7;
        }
        .section-alt {
            background: #fff;
        }
        .section-tinted {
            background: linear-gradient(180deg, #f7f9ff 0%, #f0edff 100%);
        }

        /* ============ 核心介绍 ============ */
        .intro-grid {
            display: grid;
            grid-template-columns: 1.1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .intro-copy .lead {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .intro-copy p {
            color: var(--text-light);
            line-height: 1.9;
            margin-bottom: 22px;
        }
        .intro-points {
            margin-top: 28px;
        }
        .intro-points li {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 12px 0;
            border-bottom: 1px dashed var(--border);
        }
        .intro-points li:last-child {
            border-bottom: none;
        }
        .intro-points i {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            flex-shrink: 0;
            margin-top: 4px;
        }
        .intro-points strong {
            display: block;
            font-size: 15px;
            color: var(--text);
        }
        .intro-points span {
            font-size: 14px;
            color: var(--text-light);
        }
        .data-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .data-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            text-align: center;
            transition: var(--transition);
        }
        .data-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .data-card .num {
            font-size: 32px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .data-card .label {
            font-size: 13px;
            color: var(--text-light);
            margin-top: 6px;
            font-weight: 500;
        }

        /* ============ 分类入口 ============ */
        .category-card-wrap {
            margin-bottom: 24px;
        }
        .category-card {
            display: block;
            background: var(--card-bg);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            height: 100%;
            transition: var(--transition);
        }
        .category-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(91, 109, 245, 0.3);
        }
        .category-img {
            position: relative;
            height: 180px;
            overflow: hidden;
        }
        .category-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .category-card:hover .category-img img {
            transform: scale(1.05);
        }
        .category-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(27, 35, 51, 0.3) 100%);
        }
        .category-num {
            position: absolute;
            top: 16px;
            right: 16px;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(4px);
            color: var(--primary);
            font-size: 13px;
            font-weight: 800;
            padding: 4px 14px;
            border-radius: 20px;
            z-index: 2;
        }
        .category-body {
            padding: 26px 26px 22px;
        }
        .category-body h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .category-body p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 18px;
        }
        .category-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
        }
        .category-link i {
            transition: transform 0.3s ease;
        }
        .category-card:hover .category-link i {
            transform: translateX(4px);
        }

        /* ============ 使用流程 ============ */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 26px;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 42px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0.25;
            z-index: 0;
        }
        .step-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px 24px 24px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            position: relative;
            z-index: 1;
            transition: var(--transition);
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .step-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 20px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: 0 10px 24px rgba(91, 109, 245, 0.28);
        }
        .step-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ============ 最新资讯 ============ */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-item {
            display: block;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px 28px;
            transition: var(--transition);
        }
        .news-item:hover {
            border-color: rgba(91, 109, 245, 0.3);
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .news-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 10px;
        }
        .news-cat {
            background: var(--accent-light);
            color: var(--accent);
            font-size: 12px;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 20px;
        }
        .news-meta time {
            font-size: 12px;
            color: var(--text-light);
        }
        .news-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .news-excerpt {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            margin: 0;
        }
        .empty-state {
            background: var(--card-bg);
            border: 1px dashed var(--border);
            border-radius: var(--radius);
            padding: 50px 30px;
            text-align: center;
            color: var(--text-light);
            font-size: 15px;
        }
        .news-side {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .side-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
        }
        .side-card h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border);
        }
        .side-card a {
            display: block;
            padding: 9px 0;
            color: var(--text-light);
            font-size: 14px;
            font-weight: 500;
            border-radius: 6px;
            transition: var(--transition);
        }
        .side-card a:hover {
            color: var(--primary);
            padding-left: 6px;
        }
        .side-card-primary {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            border: none;
        }
        .side-card-primary h4 {
            border-bottom-color: rgba(255, 255, 255, 0.2);
        }
        .side-card-primary p {
            font-size: 14px;
            opacity: 0.85;
            margin-bottom: 18px;
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            font-size: 13px;
            padding: 10px 22px;
            border-radius: 40px;
            box-shadow: 0 5px 16px rgba(0, 0, 0, 0.1);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

        /* ============ 功能亮点 ============ */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 34px 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 50px;
            height: 50px;
            border-radius: 14px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 19px;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
        }
        .feature-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            margin: 0;
        }

        /* ============ 图文分区 ============ */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
            margin-bottom: 80px;
        }
        .feature-block:last-child {
            margin-bottom: 0;
        }
        .feature-block.reverse {
            direction: rtl;
        }
        .feature-block .block-copy {
            direction: ltr;
        }
        .block-copy .tag {
            display: inline-block;
            background: var(--accent-light);
            color: var(--accent);
            font-size: 12px;
            font-weight: 700;
            padding: 4px 16px;
            border-radius: 30px;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }
        .block-copy h2 {
            font-size: 28px;
            font-weight: 800;
            line-height: 1.35;
            margin-bottom: 14px;
        }
        .block-copy p {
            color: var(--text-light);
            line-height: 1.85;
            margin-bottom: 20px;
            font-size: 15px;
        }
        .block-list li {
            display: flex;
            gap: 10px;
            padding: 6px 0;
            font-size: 15px;
            color: var(--text);
            font-weight: 500;
        }
        .block-list i {
            color: var(--primary);
            margin-top: 4px;
            font-size: 14px;
        }
        .block-img {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            line-height: 0;
        }
        .block-img img {
            width: 100%;
            height: auto;
        }

        /* ============ FAQ ============ */
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 2px 10px rgba(91, 109, 245, 0.04);
        }
        .faq-item[open] {
            border-color: rgba(91, 109, 245, 0.35);
            box-shadow: var(--shadow-md);
        }
        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 24px 28px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            list-style: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary i {
            color: var(--primary);
            font-size: 16px;
            transition: transform 0.35s ease;
            flex-shrink: 0;
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            border-radius: 50%;
        }
        .faq-item[open] summary i {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
        }
        .faq-answer {
            padding: 0 28px 24px;
            color: var(--text-light);
            font-size: 14.5px;
            line-height: 1.8;
            border-top: 1px solid var(--border);
            margin-top: 2px;
        }
        .faq-answer p {
            padding-top: 18px;
        }

        /* ============ CTA ============ */
        .cta-section {
            position: relative;
            padding: 110px 0;
            background: linear-gradient(120deg, rgba(70, 85, 220, 0.92), rgba(124, 92, 245, 0.88)),
                url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            color: #fff;
            text-align: center;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px;
            left: -60px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.07);
        }
        .cta-content {
            position: relative;
            z-index: 2;
            max-width: 700px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: 38px;
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .cta-content p {
            font-size: 16px;
            opacity: 0.88;
            margin-bottom: 36px;
            line-height: 1.8;
        }
        .cta-content .btn {
            font-size: 16px;
            padding: 16px 38px;
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: #141B2D;
            color: #B0B8C9;
            padding: 70px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 50px;
            padding-bottom: 50px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 18px;
        }
        .footer-brand .brand-icon {
            width: 40px;
            height: 40px;
            font-size: 16px;
        }
        .footer-brand .brand-name {
            color: #fff;
            font-size: 18px;
            font-weight: 700;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: #8A94A9;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            padding: 7px 0;
            font-size: 14px;
            color: #8A94A9;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: #fff;
            padding-left: 5px;
        }
        .footer-col .footer-note {
            font-size: 13px;
            color: #6B7488;
            line-height: 1.7;
            margin-top: 4px;
        }
        .footer-bottom {
            padding: 26px 0;
            text-align: center;
            font-size: 13px;
            color: #6B7488;
        }
        .footer-bottom a {
            color: #9AA4B8;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ============ 响应式 ============ */
        @media (max-width: 1024px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .mobile-menu.open {
                display: block;
            }
            .container {
                padding: 0 24px;
            }
            .section {
                padding: 70px 0;
            }
            .hero {
                padding: 90px 0 76px;
            }
            .hero h1 {
                font-size: 38px;
            }
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 44px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .steps-grid::before {
                display: none;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-block {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .hero {
                padding: 72px 0 60px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .hero-subtitle {
                font-size: 17px;
            }
            .hero-desc {
                font-size: 14px;
            }
            .hero-stats {
                gap: 26px;
                padding-top: 26px;
            }
            .stat-item strong {
                font-size: 24px;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .category-body {
                padding: 22px 20px 18px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .features-grid .feature-card {
                padding: 26px 22px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .cta-section {
                padding: 80px 0;
            }
            .cta-content h2 {
                font-size: 28px;
            }
            .container {
                padding: 0 18px;
            }
            .news-item {
                padding: 20px;
            }
        }
        @media (max-width: 520px) {
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                justify-content: center;
            }
            .hero-stats {
                flex-direction: column;
                gap: 18px;
            }
            .data-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: article */
:root {
    --primary: #4f6ef7;
    --primary-dark: #3955d6;
    --primary-light: #e8edfd;
    --secondary: #7c5cfc;
    --accent: #f0a04b;
    --bg: #f5f7fb;
    --bg-card: #ffffff;
    --bg-dark: #1b2340;
    --text: #1f2d3d;
    --text-light: #526476;
    --text-muted: #8a9aa8;
    --heading: #14213d;
    --border: #e4e9f2;
    --radius: 14px;
    --radius-lg: 22px;
    --radius-sm: 8px;
    --shadow: 0 4px 20px rgba(31,45,61,.06);
    --shadow-md: 0 8px 30px rgba(31,45,61,.09);
    --shadow-lg: 0 20px 50px rgba(31,45,61,.14);
    --sidebar-w: 264px;
    --transition: all .28s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
button, input, textarea, select { font: inherit; }
.container { max-width: 1200px; width: 100%; margin: 0 auto; padding: 0 24px; }

.app-shell { display: flex; min-height: 100vh; }
.side-header {
    width: var(--sidebar-w);
    flex-shrink: 0;
    position: fixed;
    top: 0; left: 0;
    height: 100vh;
    background: linear-gradient(180deg, #14213d 0%, #1b2340 60%, #232c4e 100%);
    display: flex;
    flex-direction: column;
    z-index: 100;
    border-right: 1px solid rgba(255,255,255,.08);
}
.side-inner { display: flex; flex-direction: column; height: 100%; padding: 24px 16px; overflow-y: auto; }
.brand-logo { display: flex; align-items: center; gap: 12px; padding: 8px 12px 20px; border-bottom: 1px solid rgba(255,255,255,.08); margin-bottom: 20px; }
.brand-logo:hover { opacity: .88; }
.brand-icon {
    width: 42px; height: 42px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff; font-size: 19px;
    box-shadow: 0 4px 14px rgba(79,110,247,.35);
}
.brand-name { font-size: 20px; font-weight: 700; color: #fff; letter-spacing: 1px; }
.side-nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.nav-link {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius);
    color: rgba(255,255,255,.7);
    font-size: 15px; font-weight: 500;
    transition: var(--transition);
    border: 1px solid transparent;
}
.nav-link i { width: 20px; text-align: center; font-size: 16px; }
.nav-link:hover { background: rgba(255,255,255,.08); color: #fff; transform: translateX(4px); }
.nav-link.active { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; box-shadow: 0 6px 20px rgba(79,110,247,.4); }
.side-contact { margin-top: 20px; padding: 16px; border-radius: var(--radius); background: rgba(255,255,255,.06); text-align: center; }
.side-contact-title { color: rgba(255,255,255,.6); font-size: 13px; margin-bottom: 10px; }
.side-contact .btn { width: 100%; justify-content: center; }

.mobile-header {
    display: none;
    position: sticky; top: 0; z-index: 1000;
    background: linear-gradient(90deg, #14213d, #1b2340);
    padding: 12px 20px;
    align-items: center; justify-content: space-between;
    box-shadow: 0 4px 20px rgba(0,0,0,.18);
}
.mobile-header .brand-logo { border: none; margin: 0; padding: 0; }
.mobile-header .brand-name { font-size: 18px; }
.menu-toggle {
    background: rgba(255,255,255,.12);
    border: none; color: #fff;
    width: 42px; height: 42px; border-radius: 12px;
    font-size: 18px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition);
}
.menu-toggle:hover { background: var(--primary); }
.mobile-menu {
    display: none;
    background: #1b2340;
    padding: 10px 20px 20px;
}
.mobile-menu .nav-link { color: rgba(255,255,255,.85); border-radius: 10px; }
.mobile-menu .nav-link:hover { background: rgba(255,255,255,.08); color: #fff; transform: none; }
.mobile-menu .nav-link.active { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; }

.main-wrapper { flex: 1; min-width: 0; display: flex; flex-direction: column; margin-left: var(--sidebar-w); }
.main-content { flex: 1; }

.article-banner { position: relative; background-size: cover; background-position: center; background-color: #14213d; }
.article-banner-overlay {
    background: linear-gradient(135deg, rgba(20,33,61,.94) 0%, rgba(35,44,78,.86) 55%, rgba(79,110,247,.72) 100%);
    padding: 60px 0 52px;
}
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: rgba(255,255,255,.65); margin-bottom: 22px; }
.breadcrumb a { color: rgba(255,255,255,.85); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb-sep { color: rgba(255,255,255,.4); }
.breadcrumb-current { color: rgba(255,255,255,.65); }
.article-title { font-size: clamp(26px, 4.2vw, 42px); color: #fff; font-weight: 800; line-height: 1.3; max-width: 820px; margin-bottom: 18px; letter-spacing: .5px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 8px; }
.meta-item { display: inline-flex; align-items: center; gap: 6px; color: rgba(255,255,255,.75); font-size: 14px; background: rgba(255,255,255,.12); padding: 6px 14px; border-radius: 30px; backdrop-filter: blur(4px); }
.meta-item i { font-size: 13px; }

.article-section { padding: 48px 0; }
.article-container { max-width: 860px; margin: 0 auto; padding: 40px 32px; background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow); position: relative; top: -20px; }
.article-content { font-size: 16px; line-height: 1.9; color: var(--text); word-break: break-word; }
.article-content h2, .article-content h3, .article-content h4 { color: var(--heading); font-weight: 700; margin: 30px 0 14px; line-height: 1.4; }
.article-content h2 { font-size: 24px; padding-left: 14px; border-left: 4px solid var(--primary); border-radius: 2px; }
.article-content h3 { font-size: 20px; }
.article-content p { margin-bottom: 18px; }
.article-content img { border-radius: var(--radius); box-shadow: var(--shadow-md); margin: 20px 0; }
.article-content blockquote { border-left: 4px solid var(--primary); background: var(--primary-light); padding: 14px 20px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 24px 0; color: var(--text-light); font-style: normal; }
.article-content ul, .article-content ol { margin: 0 0 18px 26px; }
.article-content li { margin-bottom: 8px; }
.article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 4px; }
.article-content a:hover { text-decoration-thickness: 2px; }
.article-content table { width: 100%; border-collapse: collapse; margin: 20px 0; border-radius: var(--radius-sm); overflow: hidden; }
.article-content table th, .article-content table td { padding: 12px 16px; border: 1px solid var(--border); text-align: left; }
.article-content table th { background: var(--primary-light); color: var(--heading); font-weight: 600; }

.article-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.tag { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; background: var(--primary-light); color: var(--primary-dark); border-radius: 30px; font-size: 13px; font-weight: 500; }
.tag i { font-size: 12px; }

.article-share { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 12px; }
.article-share span { font-size: 14px; color: var(--text-muted); }
.share-btn { width: 40px; height: 40px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; font-size: 14px; border: 1px solid var(--border); color: var(--text-light); transition: var(--transition); }
.share-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }

.not-found-wrap { padding: 100px 0 80px; text-align: center; }
.not-found-card { max-width: 560px; margin: 0 auto; background: #fff; border-radius: var(--radius-lg); padding: 60px 40px; box-shadow: var(--shadow); }
.not-found-icon { width: 80px; height: 80px; margin: 0 auto 20px; background: var(--primary-light); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--primary); font-size: 32px; }
.not-found-card h1 { font-size: 28px; color: var(--heading); margin-bottom: 12px; }
.not-found-card p { color: var(--text-light); margin-bottom: 24px; }

.related-section { padding: 20px 0 60px; }
.section-title-wrap { text-align: center; margin-bottom: 40px; }
.section-title { font-size: 30px; font-weight: 800; color: var(--heading); margin-bottom: 6px; letter-spacing: .5px; }
.section-subtitle { color: var(--text-muted); font-size: 15px; }
.related-grid { margin-top: 10px; }
.related-card {
    display: flex; flex-direction: column;
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    border: 1px solid transparent;
}
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.related-card-img { position: relative; height: 180px; overflow: hidden; }
.related-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.related-card:hover .related-card-img img { transform: scale(1.05); }
.related-card-tag { position: absolute; top: 12px; left: 12px; padding: 4px 12px; background: rgba(27,35,64,.82); color: #fff; font-size: 12px; border-radius: 20px; backdrop-filter: blur(4px); }
.related-card-body { padding: 20px; display: flex; flex-direction: column; flex: 1; }
.related-card-body h3 { font-size: 17px; font-weight: 700; color: var(--heading); line-height: 1.4; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.related-card-body p { font-size: 14px; color: var(--text-muted); line-height: 1.6; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 12px; }
.related-card-date { font-size: 13px; color: var(--text-muted); display: flex; align-items: center; gap: 6px; }
.related-card-date i { font-size: 12px; }

.cta-section { padding: 50px 0; }
.cta-inner { background: linear-gradient(135deg, #14213d, #2a3a6b); border-radius: var(--radius-lg); padding: 50px 40px; text-align: center; position: relative; overflow: hidden; }
.cta-inner::before { content: ''; position: absolute; top: -40px; right: -40px; width: 200px; height: 200px; border-radius: 50%; background: rgba(79,110,247,.25); filter: blur(10px); }
.cta-inner::after { content: ''; position: absolute; bottom: -60px; left: -60px; width: 180px; height: 180px; border-radius: 50%; background: rgba(124,92,252,.2); filter: blur(8px); }
.cta-inner h2 { color: #fff; font-size: 28px; font-weight: 800; margin-bottom: 12px; position: relative; z-index: 1; }
.cta-inner p { color: rgba(255,255,255,.75); font-size: 16px; margin-bottom: 24px; position: relative; z-index: 1; }
.cta-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 1; }

.faq-section { padding: 10px 0 60px; }
.faq-item { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px 26px; margin-bottom: 16px; border: 1px solid transparent; transition: var(--transition); }
.faq-item:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.faq-q { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 700; color: var(--heading); cursor: pointer; }
.faq-q i { color: var(--primary); font-size: 14px; width: 22px; height: 22px; border-radius: 50%; background: var(--primary-light); display: flex; align-items: center; justify-content: center; }
.faq-a { margin-top: 10px; padding-left: 32px; color: var(--text-light); font-size: 15px; line-height: 1.7; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: 30px; font-size: 15px; font-weight: 600; cursor: pointer; transition: var(--transition); border: none; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; box-shadow: 0 6px 20px rgba(79,110,247,.32); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(79,110,247,.42); color: #fff; }
.btn-outline { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.5); }
.btn-outline:hover { background: rgba(255,255,255,.12); border-color: #fff; color: #fff; }
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-lg { padding: 14px 36px; font-size: 16px; }

.site-footer { background: #14213d; color: rgba(255,255,255,.6); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-brand .brand-logo { border-bottom: none; padding: 0; margin-bottom: 14px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 15px; line-height: 1.8; color: rgba(255,255,255,.55); }
.footer-col h4 { color: #fff; font-size: 17px; font-weight: 700; margin-bottom: 18px; }
.footer-col a { display: block; color: rgba(255,255,255,.55); font-size: 14px; margin-bottom: 10px; transition: var(--transition); }
.footer-col a:hover { color: #fff; transform: translateX(4px); }
.footer-note { font-size: 14px; color: rgba(255,255,255,.55); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.footer-note i { color: var(--primary); width: 16px; }
.footer-bottom { padding: 20px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; color: rgba(255,255,255,.4); }

@media (max-width: 1024px) {
    .side-header { display: none; }
    .main-wrapper { margin-left: 0; }
    .mobile-header { display: flex; }
    .mobile-menu.open { display: block; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 768px) {
    .article-banner-overlay { padding: 40px 0 56px; }
    .article-container { padding: 28px 22px; }
    .cta-inner { padding: 36px 20px; }
    .cta-inner h2 { font-size: 24px; }
    .faq-item { padding: 18px 18px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .related-grid { margin: 0; }
    .section-title { font-size: 26px; }
}
@media (max-width: 520px) {
    .article-title { font-size: 23px; }
    .breadcrumb { font-size: 13px; flex-wrap: wrap; }
    .meta-item { font-size: 13px; padding: 5px 10px; }
    .article-content { font-size: 15px; }
    .article-content h2 { font-size: 21px; }
    .btn { padding: 10px 20px; font-size: 14px; }
    .btn-lg { padding: 12px 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
}

/* roulang page: category1 */
/* ========== 设计变量 ========== */
        :root {
            --primary: #6C5CE7;
            --primary-dark: #5A4BD1;
            --primary-light: #EEEAFC;
            --secondary: #F39C12;
            --secondary-dark: #E67E22;
            --secondary-light: #FFF6E5;
            --bg: #F8F7FC;
            --surface: #FFFFFF;
            --text: #2D2A3E;
            --muted: #7A7690;
            --border: #E6E3F0;
            --success: #2ECC71;
            --danger: #E74C3C;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow-xs: 0 2px 6px rgba(45, 42, 62, 0.04);
            --shadow-sm: 0 4px 16px rgba(45, 42, 62, 0.08);
            --shadow-md: 0 8px 24px rgba(45, 42, 62, 0.1);
            --shadow-lg: 0 16px 40px rgba(45, 42, 62, 0.14);
            --nav-width: 260px;
            --transition: all 0.3s ease;
            --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }

        /* ========== Reset & Base ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            font-family: var(--font);
            border: none;
            cursor: pointer;
        }
        .container,
        .grid-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ========== 导航 ========== */
        .layout {
            min-height: 100vh;
        }
        .main-area {
            margin-left: var(--nav-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .side-nav {
            width: var(--nav-width);
            background: linear-gradient(180deg, #2D2A3E 0%, #1E1C2E 100%);
            padding: 32px 20px;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            transition: transform 0.3s ease;
        }
        .side-nav .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 36px;
            padding: 0 8px;
        }
        .brand-icon {
            width: 44px;
            height: 44px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            box-shadow: 0 4px 16px rgba(243, 156, 18, 0.35);
            flex-shrink: 0;
        }
        .brand-name {
            font-size: 18px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: #fff;
            white-space: nowrap;
        }
        .side-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 13px 16px;
            border-radius: 12px;
            color: rgba(255, 255, 255, 0.72);
            font-size: 15px;
            font-weight: 500;
            margin-bottom: 6px;
            transition: var(--transition);
        }
        .side-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            flex-shrink: 0;
        }
        .side-nav .nav-link:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            transform: translateX(3px);
        }
        .side-nav .nav-link.active {
            background: linear-gradient(135deg, var(--primary), #8B7BFF);
            color: #fff;
            box-shadow: 0 6px 20px rgba(108, 92, 231, 0.45);
        }

        /* 移动端顶部导航 */
        .mobile-header {
            display: none;
            background: #1E1C2E;
            padding: 14px 20px;
            position: sticky;
            top: 0;
            z-index: 900;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
        }
        .mobile-header .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .mobile-header .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            font-size: 17px;
        }
        .mobile-header .brand-name {
            font-size: 16px;
        }
        .menu-toggle {
            background: rgba(255, 255, 255, 0.1);
            border: none;
            color: #fff;
            font-size: 22px;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        /* ========== Hero ========== */
        .page-hero {
            position: relative;
            padding: 90px 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            text-align: center;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(45, 42, 62, 0.88) 0%, rgba(108, 92, 231, 0.78) 100%);
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 8px 22px;
            border-radius: 100px;
            backdrop-filter: blur(8px);
            margin-bottom: 20px;
        }
        .page-hero h1 {
            color: #fff;
            font-size: 44px;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: 1px;
            margin-bottom: 16px;
            text-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
        }
        .page-hero p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 18px;
            max-width: 680px;
            margin: 0 auto 30px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 28px;
            flex-wrap: wrap;
        }
        .hero-tags {
            display: flex;
            justify-content: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .tag {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 100px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
        }
        .tag.light {
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            backdrop-filter: blur(4px);
        }

        /* ========== 面包屑 ========== */
        .breadcrumb {
            padding: 16px 0;
            font-size: 14px;
            color: var(--muted);
            background: #fff;
            border-bottom: 1px solid var(--border);
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: #CCC;
            font-size: 12px;
        }
        .breadcrumb .current {
            color: var(--muted);
        }
        .breadcrumb i {
            color: #CCC;
            font-size: 13px;
        }

        /* ========== 板块通用 ========== */
        .section {
            padding: 80px 0;
        }
        .section-head {
            margin-bottom: 48px;
        }
        .section-head.center {
            text-align: center;
            max-width: 720px;
            margin-left: auto;
            margin-right: auto;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--secondary-light);
            color: var(--secondary-dark);
            font-size: 13px;
            font-weight: 700;
            padding: 7px 18px;
            border-radius: 100px;
            letter-spacing: 0.5px;
            margin-bottom: 14px;
        }
        .section-head h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text);
            line-height: 1.35;
            margin-bottom: 12px;
        }
        .section-head p {
            color: var(--muted);
            font-size: 16px;
            line-height: 1.8;
        }

        /* ========== 卡片 ========== */
        .card {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 30px 26px;
            transition: var(--transition);
            height: 100%;
            position: relative;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: rgba(108, 92, 231, 0.3);
        }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 18px;
            background: linear-gradient(135deg, var(--primary), #8B7BFF);
            color: #fff;
            box-shadow: 0 6px 16px rgba(108, 92, 231, 0.3);
        }
        .card-icon.gold {
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            box-shadow: 0 6px 16px rgba(243, 156, 18, 0.3);
        }
        .card-icon.green {
            background: linear-gradient(135deg, #2ECC71, #27AE60);
            box-shadow: 0 6px 16px rgba(46, 204, 113, 0.3);
        }
        .card-icon.blue {
            background: linear-gradient(135deg, #3498DB, #2980B9);
            box-shadow: 0 6px 16px rgba(52, 152, 219, 0.3);
        }
        .card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }
        .card p {
            color: var(--muted);
            font-size: 15px;
            line-height: 1.7;
        }
        .card-tag {
            position: absolute;
            top: 16px;
            right: 16px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 100px;
        }

        /* ========== 步骤 ========== */
        .steps-section {
            background: linear-gradient(180deg, #FFFFFF 0%, #F8F7FC 100%);
        }
        .step-card {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 36px 26px;
            text-align: center;
            height: 100%;
            transition: var(--transition);
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
            border-color: rgba(243, 156, 18, 0.4);
        }
        .step-num {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: #fff;
            font-size: 20px;
            font-weight: 800;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            box-shadow: 0 6px 18px rgba(243, 156, 18, 0.35);
        }
        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }
        .step-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.7;
        }

        /* ========== 图文区块 ========== */
        .feature-section {
            background: var(--surface);
        }
        .feature-img {
            position: relative;
        }
        .feature-img img {
            border-radius: 20px;
            box-shadow: var(--shadow-lg);
            width: 100%;
            object-fit: cover;
        }
        .img-badge {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(255, 255, 255, 0.95);
            color: var(--text);
            font-size: 14px;
            font-weight: 700;
            padding: 10px 20px;
            border-radius: 100px;
            box-shadow: var(--shadow-md);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .img-badge i {
            color: var(--success);
        }
        .feature-content .section-label {
            margin-bottom: 10px;
        }
        .feature-content h2 {
            font-size: 28px;
            font-weight: 800;
            line-height: 1.35;
            margin-bottom: 18px;
            color: var(--text);
        }
        .feature-content>p {
            color: var(--muted);
            margin-bottom: 20px;
            font-size: 16px;
            line-height: 1.8;
        }
        .feature-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 0;
            font-size: 15px;
            color: var(--text);
            border-bottom: 1px dashed var(--border);
        }
        .feature-list li:last-child {
            border-bottom: none;
        }
        .feature-list li i {
            color: var(--secondary);
            font-size: 16px;
            width: 22px;
            flex-shrink: 0;
        }
        .align-middle {
            align-items: center;
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: linear-gradient(180deg, #F8F7FC 0%, #FFFFFF 100%);
        }
        .faq-list {
            max-width: 880px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(108, 92, 231, 0.35);
            box-shadow: var(--shadow-sm);
        }
        .faq-item.active {
            border-color: var(--primary);
            box-shadow: 0 4px 20px rgba(108, 92, 231, 0.12);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 22px 28px;
            cursor: pointer;
            font-size: 17px;
            font-weight: 600;
            color: var(--text);
            gap: 20px;
        }
        .faq-question i {
            color: var(--primary);
            transition: transform 0.3s ease;
            flex-shrink: 0;
            font-size: 15px;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            display: none;
            padding: 0 28px 24px;
            color: var(--muted);
            font-size: 15px;
            line-height: 1.8;
        }
        .faq-answer p {
            margin-bottom: 10px;
        }
        .faq-answer p:last-child {
            margin-bottom: 0;
        }

        /* ========== 安全提示横幅 ========== */
        .security-tip-section {
            padding: 40px 0;
        }
        .security-tip-banner {
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            display: flex;
            align-items: center;
            gap: 28px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .security-tip-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(45, 42, 62, 0.94) 0%, rgba(108, 92, 231, 0.88) 100%);
        }
        .security-tip-banner>* {
            position: relative;
            z-index: 1;
        }
        .tip-icon {
            width: 68px;
            height: 68px;
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 30px;
            flex-shrink: 0;
            backdrop-filter: blur(6px);
        }
        .tip-content {
            flex: 1;
        }
        .tip-content h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .tip-content p {
            color: rgba(255, 255, 255, 0.88);
            font-size: 15px;
            line-height: 1.7;
        }
        .security-tip-banner .btn {
            flex-shrink: 0;
        }

        /* ========== CTA ========== */
        .cta-wrapper {
            padding-top: 20px;
            padding-bottom: 80px;
        }
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, #8B7BFF 60%, #A78BFA 100%);
            border-radius: 28px;
            padding: 60px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            width: 320px;
            height: 320px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
            top: -100px;
            right: -80px;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            width: 180px;
            height: 180px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 50%;
            bottom: -60px;
            left: 60px;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 14px;
            line-height: 1.3;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 17px;
            margin-bottom: 32px;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 14px;
            flex-wrap: wrap;
            position: relative;
            z-index: 2;
        }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            padding: 14px 32px;
            border-radius: 100px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            border: none;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--secondary);
            color: #fff;
            box-shadow: 0 6px 20px rgba(243, 156, 18, 0.4);
        }
        .btn-primary:hover {
            background: var(--secondary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(243, 156, 18, 0.5);
        }
        .btn-light {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
        }
        .btn-light:hover {
            background: #F8F7FC;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }
        .btn-outline-white {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.5);
            color: #fff;
        }
        .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
        }
        .btn:active {
            transform: translateY(0);
        }

        /* ========== 页脚 ========== */
        .site-footer {
            margin-left: var(--nav-width);
            background: #1E1C2E;
            padding: 64px 0 28px;
            color: rgba(255, 255, 255, 0.8);
        }
        .site-footer .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 48px;
        }
        .footer-brand .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 18px;
        }
        .footer-brand .brand-logo .brand-name {
            color: #fff;
            font-size: 18px;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.9;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 12px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 28px;
            height: 3px;
            background: linear-gradient(90deg, var(--secondary), var(--secondary-dark));
            border-radius: 3px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            padding: 6px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary);
            padding-left: 8px;
        }
        .footer-note {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            padding: 6px 0;
            display: flex;
            align-items: center;
            gap: 10px;
            line-height: 1.6;
        }
        .footer-note i {
            color: var(--secondary);
            width: 20px;
            text-align: center;
        }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
        }
        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            line-height: 1.9;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            .side-nav {
                transform: translateX(-100%);
            }
            .side-nav.mobile-open {
                transform: translateX(0);
                box-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
            }
            .mobile-header {
                display: flex;
            }
            .main-area {
                margin-left: 0;
            }
            .site-footer {
                margin-left: 0;
            }
            .page-hero {
                padding: 70px 0;
            }
            .page-hero h1 {
                font-size: 36px;
            }
            .section {
                padding: 60px 0;
            }
            .section-head h2 {
                font-size: 28px;
            }
            .security-tip-banner {
                padding: 32px 28px;
                flex-wrap: wrap;
            }
            .cta-section {
                padding: 48px 32px;
            }
            .cta-section h2 {
                font-size: 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }
        }

        @media (max-width: 767px) {
            .page-hero {
                padding: 56px 0;
            }
            .page-hero h1 {
                font-size: 30px;
            }
            .page-hero p {
                font-size: 16px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .section {
                padding: 48px 0;
            }
            .section-head {
                margin-bottom: 36px;
            }
            .section-head h2 {
                font-size: 24px;
            }
            .feature-content h2 {
                font-size: 22px;
            }
            .security-tip-banner {
                flex-direction: column;
                text-align: center;
            }
            .security-tip-banner .tip-content {
                text-align: left;
            }
            .security-tip-banner .btn {
                width: 100%;
                justify-content: center;
            }
            .cta-section {
                padding: 40px 24px;
                border-radius: 20px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            .cta-buttons .btn {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .container,
            .grid-container {
                padding: 0 16px;
            }
            .page-hero h1 {
                font-size: 26px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .card {
                padding: 24px 20px;
            }
            .step-card {
                padding: 28px 20px;
            }
            .faq-question {
                padding: 18px 20px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 20px 20px;
                font-size: 14px;
            }
            .security-tip-banner {
                padding: 28px 20px;
            }
            .tip-icon {
                width: 52px;
                height: 52px;
                font-size: 22px;
                border-radius: 14px;
            }
            .tip-content h3 {
                font-size: 19px;
            }
            .feature-list li {
                font-size: 14px;
                padding: 10px 0;
            }
            .img-badge {
                font-size: 12px;
                padding: 8px 14px;
                bottom: 14px;
                left: 14px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #2d6cdf;
            --primary-dark: #1b4ea5;
            --primary-light: #5b8def;
            --accent: #22d3ee;
            --accent-soft: rgba(34, 211, 238, 0.14);
            --night: #0b1628;
            --night-light: #14233f;
            --bg: #f4f7fc;
            --surface: #ffffff;
            --text: #1e2a3d;
            --text-weak: #64748b;
            --border: #e2e8f0;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --radius: 16px;
            --radius-lg: 24px;
            --radius-sm: 10px;
            --shadow-sm: 0 2px 10px rgba(11, 22, 40, 0.06);
            --shadow-md: 0 8px 30px rgba(11, 22, 40, 0.08);
            --shadow-lg: 0 18px 50px rgba(11, 22, 40, 0.14);
            --sidebar-width: 282px;
            --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }

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

        html { scroll-behavior: smooth; }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; display: block; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; }

        .container { max-width: 1320px; margin: 0 auto; padding: 0 28px; }

        /* ===== 页面骨架 ===== */
        .site-shell { display: flex; min-height: 100vh; }

        .sidebar {
            width: var(--sidebar-width);
            background: linear-gradient(180deg, var(--night) 0%, var(--night-light) 100%);
            position: fixed;
            inset: 0 auto 0 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            box-shadow: 4px 0 24px rgba(11, 22, 40, 0.18);
        }

        .sidebar-inner {
            display: flex; flex-direction: column;
            height: 100%; padding: 32px 22px 24px;
        }

        .brand-logo {
            display: flex; align-items: center; gap: 12px;
            padding: 6px 8px 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .brand-icon {
            width: 46px; height: 46px;
            background: linear-gradient(135deg, var(--primary-light), var(--accent));
            border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
            color: #fff; font-size: 20px;
            box-shadow: 0 6px 18px rgba(45, 108, 223, 0.4);
            flex-shrink: 0;
        }

        .brand-name { font-weight: 900; font-size: 20px; color: #fff; letter-spacing: 0.02em; }
        .brand-tag { display: block; font-size: 12px; color: rgba(255, 255, 255, 0.55); font-weight: 400; margin-top: 2px; letter-spacing: 0.08em; }

        .side-nav { margin-top: 28px; display: flex; flex-direction: column; gap: 6px; }

        .side-nav .nav-link {
            display: flex; align-items: center; gap: 14px;
            padding: 13px 16px;
            border-radius: 12px;
            color: rgba(255, 255, 255, 0.66);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .side-nav .nav-link i {
            width: 20px; text-align: center;
            font-size: 16px;
            color: rgba(255, 255, 255, 0.45);
            transition: var(--transition);
        }

        .side-nav .nav-link:hover {
            background: rgba(255, 255, 255, 0.07);
            color: #fff;
        }

        .side-nav .nav-link:hover i { color: var(--accent); }

        .side-nav .nav-link.active {
            background: linear-gradient(135deg, rgba(45, 108, 223, 0.85), rgba(34, 211, 238, 0.55));
            color: #fff;
            border-color: rgba(255, 255, 255, 0.12);
            box-shadow: 0 8px 22px rgba(45, 108, 223, 0.32);
        }

        .side-nav .nav-link.active i { color: #fff; }

        .sidebar-status { margin-top: auto; }

        .status-card {
            background: linear-gradient(135deg, rgba(22, 38, 68, 0.96), rgba(18, 30, 55, 0.96));
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius);
            padding: 18px 16px;
        }

        .status-dot {
            display: inline-block; width: 10px; height: 10px;
            border-radius: 50%;
            background: var(--success);
            box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
            70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
            100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
        }

        .status-card p { color: #fff; font-weight: 600; font-size: 14px; margin: 10px 0 2px; }
        .status-card small { color: rgba(255, 255, 255, 0.5); font-size: 12px; }

        .main-area {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
        }

        /* ===== 移动端顶栏 ===== */
        .mobile-topbar {
            display: none;
            position: sticky;
            top: 0;
            z-index: 1200;
            background: var(--night);
            padding: 14px 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 4px 16px rgba(11, 22, 40, 0.16);
        }

        .mobile-topbar .brand-logo { padding: 0; border: none; }
        .mobile-topbar .brand-icon { width: 38px; height: 38px; font-size: 16px; border-radius: 10px; }
        .mobile-topbar .brand-name { font-size: 17px; }

        .menu-toggle {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            width: 42px; height: 42px;
            border-radius: 10px;
            font-size: 17px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .menu-toggle:hover { background: rgba(255, 255, 255, 0.12); }

        .mobile-nav {
            display: none;
            position: fixed;
            top: 0; right: 0; bottom: 0;
            width: 280px;
            z-index: 1300;
            background: var(--night);
            padding: 28px 24px;
            transform: translateX(100%);
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            flex-direction: column;
            gap: 8px;
            box-shadow: -8px 0 30px rgba(0, 0, 0, 0.25);
        }

        .mobile-nav.open { transform: translateX(0); display: flex; }

        .mobile-nav-close {
            background: transparent; border: none; color: rgba(255, 255, 255, 0.6);
            font-size: 24px; cursor: pointer; align-self: flex-end;
            padding: 6px 10px; border-radius: 8px;
        }

        .mobile-nav-close:hover { color: #fff; background: rgba(255, 255, 255, 0.1); }

        .mobile-nav .nav-link {
            display: flex; align-items: center; gap: 14px;
            padding: 14px 16px;
            border-radius: 12px;
            color: rgba(255, 255, 255, 0.7);
            font-weight: 500;
            transition: var(--transition);
        }

        .mobile-nav .nav-link:hover { background: rgba(255, 255, 255, 0.07); color: #fff; }

        .mobile-nav .nav-link.active {
            background: linear-gradient(135deg, rgba(45, 108, 223, 0.85), rgba(34, 211, 238, 0.55));
            color: #fff;
        }

        .overlay {
            display: none;
            position: fixed; inset: 0;
            background: rgba(8, 14, 28, 0.6);
            z-index: 1250;
            backdrop-filter: blur(2px);
        }
        .overlay.show { display: block; }

        /* ===== 页面主区域 ===== */
        .page-main { flex: 1; }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            background-size: cover;
            background-position: center;
            padding: 90px 0 96px;
            overflow: hidden;
        }

        .hero-overlay {
            position: absolute; inset: 0;
            background: linear-gradient(100deg, rgba(8, 16, 32, 0.94) 0%, rgba(13, 27, 54, 0.88) 48%, rgba(18, 42, 80, 0.55) 100%);
        }

        .page-hero .container { position: relative; z-index: 2; }

        .hero-breadcrumb {
            display: inline-flex;
            align-items: center; gap: 8px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.16);
            color: rgba(255, 255, 255, 0.8);
            padding: 6px 16px;
            border-radius: 100px;
            font-size: 13px;
            margin-bottom: 22px;
            backdrop-filter: blur(8px);
        }

        .hero-breadcrumb i { color: var(--accent); font-size: 12px; }

        .page-hero h1 {
            font-size: clamp(34px, 5vw, 52px);
            font-weight: 900;
            color: #fff;
            line-height: 1.2;
            letter-spacing: 0.01em;
            margin-bottom: 18px;
        }

        .page-hero h1 span {
            background: linear-gradient(120deg, #7aa8ff, #22d3ee);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .page-hero .hero-sub {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 620px;
            margin-bottom: 32px;
            line-height: 1.8;
        }

        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

        .btn {
            display: inline-flex;
            align-items: center; gap: 10px;
            padding: 14px 30px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 15px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            letter-spacing: 0.02em;
        }

        .btn i { font-size: 15px; }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            box-shadow: 0 8px 24px rgba(45, 108, 223, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(45, 108, 223, 0.5);
            color: #fff;
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.28);
            backdrop-filter: blur(8px);
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.18);
            color: #fff;
            transform: translateY(-3px);
        }

        .btn-light {
            background: #fff;
            color: var(--primary-dark);
            box-shadow: 0 8px 24px rgba(11, 22, 40, 0.16);
        }

        .btn-light:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(11, 22, 40, 0.22); color: var(--primary-dark); }

        /* ===== 通用板块 ===== */
        .section { padding: 90px 0; }

        .section-alt { background: linear-gradient(180deg, #eef3fb 0%, var(--bg) 100%); }

        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
        }

        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--primary);
            background: rgba(45, 108, 223, 0.1);
            padding: 6px 18px;
            border-radius: 100px;
            letter-spacing: 0.08em;
            margin-bottom: 16px;
        }

        .section-head h2 {
            font-size: clamp(26px, 3.4vw, 38px);
            font-weight: 900;
            color: var(--night);
            line-height: 1.3;
            margin-bottom: 12px;
        }

        .section-head p {
            color: var(--text-weak);
            font-size: 16px;
            line-height: 1.8;
        }

        /* ===== 统计板块 ===== */
        .stats-section {
            padding: 0;
            margin-top: -48px;
            position: relative;
            z-index: 5;
        }

        .stats-wrap {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
        }

        .stat-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 30px 24px;
            text-align: center;
            box-shadow: var(--shadow-md);
            border: 1px solid rgba(226, 232, 240, 0.7);
            transition: var(--transition);
        }

        .stat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

        .stat-num {
            font-size: 38px;
            font-weight: 900;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.2;
        }

        .stat-label { color: var(--text-weak); font-size: 14px; margin-top: 6px; }

        /* ===== 防护能力卡片 ===== */
        .feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

        .feature-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 32px 26px;
            border: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: var(--transition);
        }

        .feature-card:hover::before { opacity: 1; }
        .feature-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }

        .feature-icon {
            width: 58px; height: 58px;
            border-radius: 16px;
            display: flex; align-items: center; justify-content: center;
            font-size: 24px;
            margin-bottom: 20px;
        }

        .feature-icon.icon-blue { background: rgba(45, 108, 223, 0.12); color: var(--primary); }
        .feature-icon.icon-cyan { background: rgba(34, 211, 238, 0.12); color: #0e9dba; }
        .feature-icon.icon-green { background: rgba(16, 185, 129, 0.12); color: var(--success); }
        .feature-icon.icon-purple { background: rgba(139, 92, 246, 0.12); color: #8b5cf6; }

        .feature-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; color: var(--night); }

        .feature-card p { color: var(--text-weak); font-size: 14px; line-height: 1.75; }

        .feature-card .more-link {
            display: inline-flex; align-items: center; gap: 6px;
            margin-top: 16px;
            font-size: 13px; font-weight: 600; color: var(--primary);
        }

        .feature-card .more-link i { font-size: 12px; transition: var(--transition); }
        .feature-card .more-link:hover i { transform: translateX(4px); }

        /* ===== 流程板块 ===== */
        .process-section {
            background: var(--night);
            position: relative;
            overflow: hidden;
        }

        .process-section::before {
            content: '';
            position: absolute;
            top: -160px; right: -160px;
            width: 420px; height: 420px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.18), transparent 70%);
        }

        .process-section::after {
            content: '';
            position: absolute;
            bottom: -120px; left: -120px;
            width: 360px; height: 360px;
            background: radial-gradient(circle, rgba(45, 108, 223, 0.22), transparent 70%);
        }

        .process-section .section-head h2 { color: #fff; }
        .process-section .section-head p { color: rgba(255, 255, 255, 0.6); }
        .process-section .section-tag { background: rgba(34, 211, 238, 0.15); color: var(--accent); }

        .process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; position: relative; z-index: 2; }

        .process-step {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
            backdrop-filter: blur(12px);
            position: relative;
            transition: var(--transition);
        }

        .process-step:hover { background: rgba(255, 255, 255, 0.09); transform: translateY(-6px); }

        .step-num {
            width: 54px; height: 54px;
            margin: 0 auto 18px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex; align-items: center; justify-content: center;
            font-weight: 900; font-size: 20px; color: #fff;
            box-shadow: 0 0 0 6px rgba(34, 211, 238, 0.15), 0 8px 24px rgba(45, 108, 223, 0.4);
        }

        .process-step h3 { color: #fff; font-size: 18px; font-weight: 700; margin-bottom: 10px; }

        .process-step p { color: rgba(255, 255, 255, 0.55); font-size: 14px; line-height: 1.7; }

        .process-step::after {
            content: '\f105';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            right: -20px; top: 50%;
            transform: translateY(-50%);
            color: rgba(34, 211, 238, 0.6);
            font-size: 18px;
            z-index: 3;
        }

        .process-step:last-child::after { display: none; }

        /* ===== 知识库 ===== */
        .knowledge-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

        .knowledge-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .knowledge-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }

        .knowledge-cover {
            position: relative;
            height: 200px;
            overflow: hidden;
        }

        .knowledge-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
        .knowledge-card:hover .knowledge-cover img { transform: scale(1.05); }

        .knowledge-cover::after {
            content: '';
            position: absolute; inset: 0;
            background: linear-gradient(180deg, transparent 55%, rgba(8, 16, 32, 0.35));
        }

        .cover-tag {
            position: absolute;
            top: 16px; left: 16px;
            z-index: 2;
            background: rgba(255, 255, 255, 0.9);
            color: var(--primary-dark);
            font-size: 12px; font-weight: 700;
            padding: 5px 14px;
            border-radius: 100px;
            backdrop-filter: blur(8px);
        }

        .knowledge-body { padding: 26px; display: flex; flex-direction: column; flex: 1; }

        .knowledge-meta {
            display: flex; gap: 18px;
            font-size: 13px;
            color: var(--text-weak);
            margin-bottom: 12px;
        }

        .knowledge-meta i { color: var(--primary); margin-right: 4px; }

        .knowledge-body h3 { font-size: 19px; font-weight: 700; color: var(--night); margin-bottom: 10px; line-height: 1.5; }

        .knowledge-body p { color: var(--text-weak); font-size: 14px; line-height: 1.8; flex: 1; }

        .knowledge-link {
            display: inline-flex; align-items: center; gap: 8px;
            margin-top: 18px;
            font-size: 14px; font-weight: 600; color: var(--primary);
        }

        .knowledge-link i { transition: var(--transition); }
        .knowledge-link:hover i { transform: translateX(5px); }

        /* ===== 风险警示 ===== */
        .risk-wrap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

        .risk-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 30px 24px;
            border: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border-left: 4px solid;
        }

        .risk-card.risk-danger { border-left-color: var(--danger); }
        .risk-card.risk-warning { border-left-color: var(--warning); }
        .risk-card.risk-info { border-left-color: var(--primary); }
        .risk-card.risk-dark { border-left-color: var(--night); }

        .risk-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }

        .risk-icon {
            width: 46px; height: 46px;
            border-radius: 12px;
            display: flex; align-items: center; justify-content: center;
            font-size: 19px;
            margin-bottom: 16px;
        }

        .risk-danger .risk-icon { background: rgba(239, 68, 68, 0.12); color: var(--danger); }
        .risk-warning .risk-icon { background: rgba(245, 158, 11, 0.12); color: var(--warning); }
        .risk-info .risk-icon { background: rgba(45, 108, 223, 0.12); color: var(--primary); }
        .risk-dark .risk-icon { background: rgba(11, 22, 40, 0.1); color: var(--night); }

        .risk-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--night); }
        .risk-card p { font-size: 14px; color: var(--text-weak); line-height: 1.7; }

        .risk-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 100px;
            margin-top: 14px;
            background: rgba(226, 232, 240, 0.7);
            color: var(--text-weak);
        }

        /* ===== FAQ ===== */
        .faq-section { background: linear-gradient(180deg, var(--bg), #eaf0fa); }

        .faq-wrap { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }

        .faq-item {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover { box-shadow: var(--shadow-md); border-color: rgba(45, 108, 223, 0.3); }

        .faq-question {
            display: flex;
            align-items: center; gap: 16px;
            padding: 22px 26px;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: var(--night);
            transition: var(--transition);
            background: transparent;
            border: none;
            text-align: left;
            width: 100%;
        }

        .faq-question:hover { color: var(--primary); }

        .faq-q-icon {
            width: 32px; height: 32px;
            border-radius: 10px;
            background: rgba(45, 108, 223, 0.1);
            color: var(--primary);
            display: flex; align-items: center; justify-content: center;
            font-size: 15px;
            flex-shrink: 0;
        }

        .faq-arrow {
            margin-left: auto;
            color: var(--text-weak);
            transition: transform 0.35s ease;
            font-size: 14px;
        }

        .faq-item.active .faq-arrow { transform: rotate(180deg); color: var(--primary); }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }

        .faq-answer-inner {
            padding: 0 26px 24px 74px;
            color: var(--text-weak);
            font-size: 15px;
            line-height: 1.85;
            border-top: 1px dashed var(--border);
            padding-top: 18px;
        }

        .faq-item.active .faq-answer { max-height: 320px; }

        /* ===== CTA ===== */
        .cta-section { padding: 90px 0; background: var(--night); position: relative; overflow: hidden; }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px; left: 50%;
            transform: translateX(-50%);
            width: 640px; height: 340px;
            background: radial-gradient(ellipse, rgba(34, 211, 238, 0.2), transparent 70%);
        }

        .cta-box {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 28px;
            padding: 64px 48px;
            backdrop-filter: blur(16px);
            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
        }

        .cta-icon {
            width: 72px; height: 72px;
            margin: 0 auto 24px;
            border-radius: 24px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex; align-items: center; justify-content: center;
            font-size: 30px; color: #fff;
            box-shadow: 0 12px 32px rgba(45, 108, 223, 0.45);
        }

        .cta-box h2 { font-size: 32px; font-weight: 900; color: #fff; margin-bottom: 14px; }

        .cta-box p { color: rgba(255, 255, 255, 0.7); font-size: 16px; margin-bottom: 30px; line-height: 1.8; }

        .cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

        .cta-note { margin-top: 22px; font-size: 13px; color: rgba(255, 255, 255, 0.4); }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #081120;
            padding: 70px 0 0;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .site-footer .container { max-width: 1320px; }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 44px;
            padding-bottom: 44px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.07);
        }

        .footer-brand .brand-logo { padding: 0; border: none; margin-bottom: 20px; }

        .footer-brand p {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            line-height: 1.85;
            max-width: 360px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 12px;
        }

        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0;
            width: 30px; height: 3px;
            border-radius: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }

        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            padding: 6px 0;
            transition: var(--transition);
        }

        .footer-col a:hover { color: var(--accent); padding-left: 8px; }

        .footer-note {
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            padding: 6px 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-note i { color: var(--accent); width: 16px; text-align: center; }

        .footer-bottom {
            padding: 24px 0;
            text-align: center;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .footer-bottom p {
            color: rgba(255, 255, 255, 0.35);
            font-size: 13px;
        }

        /* ===== 响应式断点 ===== */
        @media (max-width: 1200px) {
            .feature-grid { grid-template-columns: repeat(2, 1fr); }
            .risk-wrap { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: repeat(2, 1fr); }
            .process-step::after { display: none; }
            .stats-wrap { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 960px) {
            .sidebar { display: none; }
            .main-area { margin-left: 0; }
            .mobile-topbar { display: flex; }
            .page-hero { padding: 70px 0 80px; }
            .section { padding: 70px 0; }
            .cta-box { padding: 48px 28px; }
            .knowledge-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 640px) {
            .container { padding: 0 20px; }
            .page-hero { padding: 54px 0 70px; }
            .page-hero h1 { font-size: 30px; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .feature-grid { grid-template-columns: 1fr; }
            .risk-wrap { grid-template-columns: 1fr; }
            .process-grid { grid-template-columns: 1fr; }
            .stats-wrap { grid-template-columns: 1fr; gap: 16px; }
            .stats-section { margin-top: -30px; }
            .section { padding: 56px 0; }
            .section-head { margin-bottom: 40px; }
            .footer-grid { grid-template-columns: 1fr; gap: 30px; }
            .faq-question { padding: 18px 18px; font-size: 15px; }
            .faq-answer-inner { padding: 0 18px 20px 60px; }
            .cta-box h2 { font-size: 25px; }
            .knowledge-cover { height: 170px; }
            .footer-brand .brand-logo { margin-bottom: 14px; }
            .footer-bottom { padding: 18px 0; }
        }

        @media (max-width: 420px) {
            .stat-num { font-size: 30px; }
            .feature-card { padding: 26px 20px; }
            .hero-sub { font-size: 15px; }
            .btn { padding: 12px 22px; font-size: 14px; }
        }

        /* ===== 焦点可见性 ===== */
        a:focus-visible, button:focus-visible {
            outline: 3px solid rgba(34, 211, 238, 0.6);
            outline-offset: 2px;
            border-radius: 6px;
        }

/* roulang page: category3 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2b4c7e;
            --primary-light: #3a6cb5;
            --primary-dark: #1c3660;
            --accent: #e8a838;
            --accent-light: #f5c36b;
            --accent-dark: #d4912a;
            --bg-main: #f4f6fa;
            --bg-card: #ffffff;
            --bg-sidebar: #15233f;
            --bg-sidebar-hover: rgba(255, 255, 255, 0.08);
            --text-main: #1e2a3a;
            --text-muted: #6b7b8f;
            --text-light: #a0b0c0;
            --border: #e2e8f0;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-w: 260px;
        }

        /* ===== 基础 Reset ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg-main);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }
        input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul, ol {
            list-style: none;
        }

        /* ===== 全局布局 ===== */
        .app-wrap {
            display: flex;
            min-height: 100vh;
        }

        /* ===== 左侧竖向导航 ===== */
        .side-nav {
            width: var(--sidebar-w);
            background: linear-gradient(180deg, #15233f 0%, #1b2a4a 55%, #203354 100%);
            padding: 30px 20px 20px;
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            bottom: 0;
            left: 0;
            z-index: 200;
            box-shadow: 4px 0 28px rgba(0, 0, 0, 0.10);
        }
        .side-nav .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 8px;
            margin-bottom: 46px;
        }
        .side-nav .brand-icon {
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, #e8a838 0%, #f5c36b 100%);
            border-radius: 13px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #1b2a4a;
            box-shadow: 0 4px 14px rgba(232, 168, 56, 0.35);
            flex-shrink: 0;
        }
        .side-nav .brand-name {
            font-size: 21px;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: 1px;
        }
        .side-nav .nav-caption {
            font-size: 12px;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: rgba(255, 255, 255, 0.35);
            padding: 0 12px;
            margin-bottom: 14px;
        }
        .side-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 18px;
            border-radius: 13px;
            color: rgba(255, 255, 255, 0.72);
            font-size: 15px;
            font-weight: 500;
            margin-bottom: 6px;
            transition: var(--transition);
            border-left: 3px solid transparent;
        }
        .side-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            flex-shrink: 0;
        }
        .side-nav .nav-link:hover {
            background: var(--bg-sidebar-hover);
            color: #ffffff;
            transform: translateX(4px);
        }
        .side-nav .nav-link.active {
            background: linear-gradient(135deg, rgba(232, 168, 56, 0.22), rgba(232, 168, 56, 0.07));
            color: #f5c36b;
            font-weight: 600;
            border-left-color: #e8a838;
            box-shadow: 0 4px 16px rgba(232, 168, 56, 0.12);
        }
        .side-nav .side-nav-footer {
            margin-top: auto;
            padding: 18px 14px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 14px;
        }
        .side-nav .side-nav-footer p {
            color: rgba(255, 255, 255, 0.5);
            font-size: 12px;
            line-height: 1.6;
            text-align: center;
        }

        /* ===== 右侧主内容区 ===== */
        .main-wrapper {
            flex: 1;
            margin-left: var(--sidebar-w);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        .main-content {
            flex: 1;
        }

        /* ===== 移动端顶部栏 ===== */
        .site-header {
            display: none;
        }

        /* ===== 通用容器 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* ===== Hero 横幅 ===== */
        .help-hero {
            position: relative;
            background: linear-gradient(135deg, #1b2a4a 0%, #2b4c7e 60%, #3a6cb5 100%);
            padding: 90px 0 80px;
            overflow: hidden;
        }
        .help-hero::before {
            content: '';
            position: absolute;
            right: -80px;
            top: -80px;
            width: 380px;
            height: 380px;
            background: radial-gradient(circle, rgba(232, 168, 56, 0.25) 0%, transparent 70%);
            border-radius: 50%;
        }
        .help-hero::after {
            content: '';
            position: absolute;
            left: 30%;
            bottom: -140px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
        }
        .help-hero .container {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 48px;
            flex-wrap: wrap;
        }
        .help-hero-text {
            flex: 1;
            min-width: 300px;
        }
        .help-hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.18);
            color: #f5c36b;
            font-size: 13px;
            padding: 6px 16px;
            border-radius: 30px;
            margin-bottom: 22px;
            backdrop-filter: blur(6px);
        }
        .help-hero-text h1 {
            font-size: 42px;
            line-height: 1.25;
            color: #ffffff;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .help-hero-text h1 span {
            color: #f5c36b;
        }
        .help-hero-text p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.82);
            max-width: 520px;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .help-search {
            display: flex;
            max-width: 520px;
            background: #ffffff;
            border-radius: 50px;
            padding: 6px 6px 6px 22px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
            gap: 8px;
        }
        .help-search input {
            flex: 1;
            border: none;
            outline: none;
            font-size: 15px;
            color: var(--text-main);
            background: transparent;
        }
        .help-search input::placeholder {
            color: var(--text-light);
        }
        .help-search button {
            background: linear-gradient(135deg, #e8a838 0%, #f5c36b 100%);
            color: #1b2a4a;
            border-radius: 50px;
            padding: 12px 26px;
            font-size: 14px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .help-search button:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(232, 168, 56, 0.4);
        }
        .help-hero-cover {
            flex: 0 0 320px;
            max-width: 320px;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
            border: 3px solid rgba(255, 255, 255, 0.2);
            transform: rotate(2deg);
            transition: var(--transition);
        }
        .help-hero-cover:hover {
            transform: rotate(0deg) scale(1.02);
        }
        .help-hero-cover img {
            width: 100%;
            height: 260px;
            object-fit: cover;
        }

        /* ===== 页面区块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: linear-gradient(180deg, #ffffff 0%, #f4f6fa 100%);
        }
        .section-header {
            text-align: center;
            max-width: 620px;
            margin: 0 auto 56px;
        }
        .section-header .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1px;
            color: var(--accent-dark);
            background: rgba(232, 168, 56, 0.12);
            padding: 6px 18px;
            border-radius: 30px;
            margin-bottom: 16px;
        }
        .section-header h2 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            margin-bottom: 14px;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        /* ===== 帮助分类卡片 ===== */
        .help-cats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .help-cat-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 18px;
            padding: 34px 26px;
            text-align: center;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .help-cat-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), #f5c36b);
            opacity: 0;
            transition: var(--transition);
        }
        .help-cat-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .help-cat-card:hover::before {
            opacity: 1;
        }
        .help-cat-icon {
            width: 72px;
            height: 72px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin: 0 auto 22px;
            background: linear-gradient(135deg, rgba(43, 76, 126, 0.1), rgba(58, 108, 181, 0.08));
            color: var(--primary);
        }
        .help-cat-card:nth-child(2) .help-cat-icon {
            background: linear-gradient(135deg, rgba(232, 168, 56, 0.14), rgba(245, 195, 107, 0.1));
            color: var(--accent-dark);
        }
        .help-cat-card:nth-child(3) .help-cat-icon {
            background: linear-gradient(135deg, rgba(39, 174, 96, 0.12), rgba(46, 204, 113, 0.08));
            color: #27ae60;
        }
        .help-cat-card:nth-child(4) .help-cat-icon {
            background: linear-gradient(135deg, rgba(155, 89, 182, 0.12), rgba(165, 105, 189, 0.08));
            color: #8e44ad;
        }
        .help-cat-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .help-cat-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .help-cat-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 500;
            color: var(--primary);
        }
        .help-cat-more i {
            transition: var(--transition);
        }
        .help-cat-more:hover i {
            transform: translateX(4px);
        }

        /* ===== FAQ 区域 ===== */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: start;
        }
        .faq-left {
            position: sticky;
            top: 30px;
        }
        .faq-left .faq-cover {
            border-radius: 20px;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            margin-bottom: 24px;
        }
        .faq-left .faq-cover img {
            height: 260px;
            width: 100%;
            object-fit: cover;
        }
        .faq-left .faq-quick-tip {
            background: linear-gradient(135deg, #1b2a4a 0%, #2b4c7e 100%);
            border-radius: 18px;
            padding: 28px;
            color: #ffffff;
        }
        .faq-left .faq-quick-tip h4 {
            font-size: 18px;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .faq-left .faq-quick-tip h4 i {
            color: #f5c36b;
        }
        .faq-left .faq-quick-tip p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.85);
        }
        .faq-right .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 24px 28px;
            margin-bottom: 14px;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-right .faq-item:hover {
            border-color: rgba(43, 76, 126, 0.25);
            box-shadow: var(--shadow-sm);
        }
        .faq-right .faq-item.open {
            border-color: rgba(43, 76, 126, 0.4);
            box-shadow: var(--shadow-md);
        }
        .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .faq-q h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            line-height: 1.5;
        }
        .faq-q .faq-toggle {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(43, 76, 126, 0.08);
            color: var(--primary);
            font-size: 14px;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-toggle {
            background: var(--primary);
            color: #ffffff;
            transform: rotate(180deg);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease, opacity 0.3s ease;
            opacity: 0;
            padding-top: 0;
        }
        .faq-item.open .faq-a {
            max-height: 320px;
            opacity: 1;
            padding-top: 14px;
        }
        .faq-a p {
            font-size: 15px;
            line-height: 1.75;
            color: var(--text-muted);
            border-left: 3px solid var(--accent);
            padding-left: 16px;
        }

        /* ===== 流程板块 ===== */
        .process-section {
            background: linear-gradient(180deg, #f4f6fa 0%, #ffffff 100%);
        }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            position: relative;
        }
        .process-grid::before {
            content: '';
            position: absolute;
            top: 48px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), transparent 80%);
            z-index: 0;
        }
        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .process-step .step-num {
            width: 96px;
            height: 96px;
            margin: 0 auto 22px;
            border-radius: 26px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            font-weight: 700;
            background: var(--bg-card);
            border: 2px solid var(--border);
            color: var(--primary);
            position: relative;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .process-step:nth-child(1) .step-num { color: var(--accent-dark); }
        .process-step:nth-child(2) .step-num { color: var(--primary); }
        .process-step:nth-child(3) .step-num { color: #27ae60; }
        .process-step:nth-child(4) .step-num { color: #8e44ad; }
        .process-step:hover .step-num {
            transform: translateY(-4px) scale(1.04);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .process-step .step-num::after {
            content: '';
            position: absolute;
            top: -8px;
            right: -8px;
            width: 28px;
            height: 28px;
            background: var(--accent);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            color: #1b2a4a;
            border: 3px solid #ffffff;
        }
        .process-step:nth-child(1) .step-num::after { content: '1'; }
        .process-step:nth-child(2) .step-num::after { content: '2'; }
        .process-step:nth-child(3) .step-num::after { content: '3'; }
        .process-step:nth-child(4) .step-num::after { content: '4'; }
        .process-step h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .process-step p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 220px;
            margin: 0 auto;
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: linear-gradient(135deg, #1b2a4a 0%, #2b4c7e 100%);
            padding: 70px 0;
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            right: -60px;
            bottom: -60px;
            width: 240px;
            height: 240px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            z-index: 1;
        }
        .stats-item {
            text-align: center;
            padding: 20px;
        }
        .stats-item .stats-num {
            font-size: 44px;
            font-weight: 700;
            color: #f5c36b;
            line-height: 1.2;
            margin-bottom: 8px;
        }
        .stats-item .stats-label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
        }
        .stats-item .stats-icon {
            font-size: 22px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 12px;
        }

        /* ===== 联系 CTA ===== */
        .contact-cta {
            padding: 90px 0;
            background: var(--bg-main);
        }
        .contact-card {
            background: var(--bg-card);
            border-radius: 28px;
            padding: 56px;
            display: flex;
            align-items: center;
            gap: 48px;
            box-shadow: var(--shadow-lg);
            border: 1px solid rgba(255, 255, 255, 0.8);
            position: relative;
            overflow: hidden;
        }
        .contact-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--accent), var(--primary), var(--accent));
            background-size: 200% 100%;
            animation: gradientMove 4s ease infinite;
        }
        @keyframes gradientMove {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }
        .contact-info {
            flex: 1;
        }
        .contact-info h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 14px;
        }
        .contact-info p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .contact-list {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 28px;
        }
        .contact-list .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            background: #f4f6fa;
            padding: 12px 20px;
            border-radius: 30px;
            font-size: 14px;
            color: var(--text-main);
        }
        .contact-list .contact-item i {
            color: var(--accent-dark);
        }
        .contact-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: #ffffff;
            padding: 15px 32px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 6px 18px rgba(43, 76, 126, 0.25);
        }
        .contact-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(43, 76, 126, 0.35);
            color: #ffffff;
        }
        .contact-qr {
            flex: 0 0 240px;
            text-align: center;
        }
        .contact-qr .qr-box {
            background: #f4f6fa;
            border-radius: 20px;
            padding: 24px;
            border: 1px solid var(--border);
            margin-bottom: 12px;
        }
        .contact-qr .qr-box i {
            font-size: 90px;
            color: var(--primary);
        }
        .contact-qr p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #101e35;
            padding: 60px 0 0;
            color: rgba(255, 255, 255, 0.75);
            border-top: 3px solid rgba(232, 168, 56, 0.5);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }
        .footer-brand .brand-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, #e8a838, #f5c36b);
            border-radius: 11px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            color: #1b2a4a;
        }
        .footer-brand .brand-name {
            font-size: 19px;
            font-weight: 700;
            color: #ffffff;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 26px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: #f5c36b;
            padding-left: 6px;
        }
        .footer-note {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 8px;
        }
        .footer-note i {
            color: var(--accent);
        }
        .footer-bottom {
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== 移动端导航 ===== */
        .mobile-nav-toggle {
            display: none;
        }
        .mobile-nav-overlay {
            display: none;
        }

        /* ===== 响应式断点 ===== */
        @media screen and (max-width: 1024px) {
            :root {
                --sidebar-w: 220px;
            }
            .side-nav {
                padding: 24px 16px;
            }
            .help-cats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 40px 24px;
            }
            .process-grid::before {
                display: none;
            }
            .contact-card {
                padding: 40px;
                flex-wrap: wrap;
            }
        }

        @media screen and (max-width: 768px) {
            .app-wrap {
                flex-direction: column;
            }
            .side-nav {
                position: fixed;
                left: -100%;
                top: 0;
                bottom: 0;
                width: 280px;
                transition: left 0.3s ease;
                z-index: 300;
                border-radius: 0 24px 24px 0;
            }
            .side-nav.open {
                left: 0;
            }
            .site-header {
                display: flex;
                align-items: center;
                justify-content: space-between;
                background: #15233f;
                padding: 14px 20px;
                box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
                position: sticky;
                top: 0;
                z-index: 150;
            }
            .site-header .mobile-brand {
                display: flex;
                align-items: center;
                gap: 10px;
            }
            .site-header .mobile-brand .brand-icon {
                width: 36px;
                height: 36px;
                background: linear-gradient(135deg, #e8a838, #f5c36b);
                border-radius: 10px;
                display: flex;
                align-items: center;
                justify-content: center;
                font-size: 15px;
                color: #1b2a4a;
            }
            .site-header .mobile-brand .brand-name {
                font-size: 17px;
                font-weight: 700;
                color: #ffffff;
            }
            .mobile-nav-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
                width: 40px;
                height: 40px;
                border-radius: 10px;
                background: rgba(255, 255, 255, 0.1);
                color: #ffffff;
                font-size: 18px;
                transition: var(--transition);
            }
            .mobile-nav-toggle:hover {
                background: rgba(255, 255, 255, 0.2);
            }
            .mobile-nav-overlay {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(0, 0, 0, 0.5);
                z-index: 250;
                display: block;
                opacity: 0;
                pointer-events: none;
                transition: opacity 0.3s ease;
            }
            .mobile-nav-overlay.show {
                opacity: 1;
                pointer-events: auto;
            }
            .main-wrapper {
                margin-left: 0;
            }
            .container {
                padding: 0 20px;
            }
            .help-hero {
                padding: 60px 0;
            }
            .help-hero-text h1 {
                font-size: 30px;
            }
            .help-hero-cover {
                display: none;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .faq-left {
                display: none;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-bottom {
                justify-content: center;
                text-align: center;
            }
            .contact-qr {
                flex: 1 0 100%;
                display: flex;
                align-items: center;
                gap: 20px;
                text-align: left;
            }
            .contact-qr .qr-box {
                margin-bottom: 0;
            }
        }

        @media screen and (max-width: 520px) {
            .help-cats-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stats-item .stats-num {
                font-size: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .contact-card {
                padding: 28px 22px;
            }
            .contact-list {
                flex-direction: column;
            }
            .help-search {
                flex-wrap: wrap;
                padding: 10px;
                border-radius: 18px;
            }
            .help-search input {
                padding: 8px 12px;
            }
            .help-search button {
                width: 100%;
                justify-content: center;
            }
            .help-hero-text h1 {
                font-size: 26px;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .faq-right .faq-item {
                padding: 18px 20px;
            }
        }

        @media screen and (max-width: 360px) {
            .stats-item .stats-num {
                font-size: 26px;
            }
        }

        /* ===== Foundation 覆盖 ===== */
        .faq-right .faq-item, .help-cat-card, .process-step, .contact-card {
            outline: none;
        }
        button:focus, .nav-link:focus, a:focus {
            outline: 2px solid rgba(232, 168, 56, 0.5);
            outline-offset: 2px;
        }