/* roulang page: index */
/* ========== 设计变量 ========== */
        :root {
            --primary: #0b1a2e;
            --primary-dark: #060d18;
            --primary-soft: #142a45;
            --accent: #f46a2c;
            --accent-dark: #d9531f;
            --accent-soft: #fdeee7;
            --ice: #1fa8a0;
            --bg: #f4f7fb;
            --bg-deep: #0b1522;
            --text: #16202e;
            --text-body: #3f5269;
            --text-muted: #7b8ca3;
            --white: #ffffff;
            --border: #dce5ef;
            --radius-sm: 8px;
            --radius: 16px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 10px rgba(11, 26, 46, 0.06);
            --shadow: 0 10px 30px rgba(11, 26, 46, 0.09);
            --shadow-lg: 0 20px 50px rgba(11, 26, 46, 0.14);
            --max-w: 1200px;
            --section-space: 96px;
            --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        }

        /* ========== 基础重置 ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        a:focus-visible,
        button:focus-visible {
            outline: 3px solid rgba(244, 106, 44, 0.4);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 15px;
            line-height: 1;
            cursor: pointer;
            transition: all 0.25s cubic-bezier(0.2, 0.6, 0.2, 1);
            border: 1px solid transparent;
        }
        .btn-sm {
            padding: 9px 20px;
            font-size: 14px;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff;
            box-shadow: 0 6px 20px rgba(244, 106, 44, 0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(244, 106, 44, 0.42);
            color: #fff;
        }
        .btn-ghost {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.6);
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.14);
            color: #fff;
        }
        .btn-dark {
            background: var(--primary);
            color: #fff;
        }
        .btn-dark:hover {
            background: var(--primary-soft);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .btn-light {
            background: #fff;
            color: var(--primary);
        }
        .btn-light:hover {
            background: var(--accent-soft);
            color: var(--accent-dark);
            transform: translateY(-2px);
        }
        .btn-text {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 0;
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            font-size: 15px;
        }
        .btn-text:hover {
            color: var(--accent-dark);
            gap: 12px;
        }

        /* ========== 导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: saturate(180%) blur(12px);
            border-bottom: 1px solid var(--border);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 74px;
        }
        .logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.2px;
            display: inline-flex;
            align-items: baseline;
        }
        .logo span {
            color: var(--accent);
            font-size: 24px;
        }
        .site-nav {
            display: flex;
            align-items: center;
            gap: 36px;
            margin-left: auto;
            margin-right: 32px;
        }
        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            padding: 8px 2px;
            letter-spacing: 0.3px;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            border-radius: 2px;
            background: var(--accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.28s ease;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link:hover::after {
            transform: scaleX(1);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            transform: scaleX(1);
        }
        .header-cta {
            flex-shrink: 0;
        }
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            background: transparent;
            cursor: pointer;
            border-radius: 10px;
            border: 1px solid var(--border);
        }
        .menu-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            border-radius: 2px;
            background: var(--primary);
            transition: transform 0.3s ease, opacity 0.3s ease;
        }
        .menu-toggle.open span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        .menu-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .menu-toggle.open span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            background-size: cover;
            background-position: center;
            background-color: var(--bg-deep);
            color: #fff;
            padding: 128px 0 118px;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(6, 13, 24, 0.94) 10%, rgba(11, 26, 46, 0.78) 45%, rgba(11, 26, 46, 0.45) 80%);
            z-index: 1;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 7px 18px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 500;
            color: #fdeee7;
            margin-bottom: 26px;
        }
        .hero-badge i {
            color: var(--ice);
        }
        .hero-copy h1 {
            font-size: clamp(32px, 4.5vw, 52px);
            font-weight: 800;
            line-height: 1.22;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-copy p.lead {
            font-size: 17px;
            line-height: 1.8;
            max-width: 540px;
            color: rgba(255, 255, 255, 0.84);
            margin-bottom: 34px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 52px;
        }
        .hero-stats {
            display: flex;
            gap: 38px;
            flex-wrap: wrap;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 30px;
        }
        .hero-stat-value {
            font-size: 26px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.2px;
        }
        .hero-stat-label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 2px;
        }

        /* 登录面板 */
        .hero-panel {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.14);
            border-radius: var(--radius-lg);
            backdrop-filter: blur(16px);
            padding: 24px;
            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
        }
        .panel-header {
            display: flex;
            align-items: center;
            gap: 10px;
            padding-bottom: 16px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
            margin-bottom: 18px;
        }
        .panel-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--ice);
            box-shadow: 0 0 10px rgba(31, 168, 160, 0.8);
        }
        .panel-title {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
        }
        .panel-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 9px 0;
            font-size: 14px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .panel-label {
            color: rgba(255, 255, 255, 0.5);
        }
        .panel-value {
            color: #fff;
            font-weight: 500;
        }
        .panel-value.live {
            color: var(--ice);
        }
        .panel-form {
            margin-top: 18px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .panel-form input {
            width: 100%;
            padding: 13px 16px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: #fff;
            font-size: 14px;
            transition: border-color 0.2s;
        }
        .panel-form input::placeholder {
            color: rgba(255, 255, 255, 0.44);
        }
        .panel-form input:focus {
            border-color: var(--accent);
        }
        .panel-form .btn {
            margin-top: 6px;
        }

        /* ========== 通用板块 ========== */
        .section {
            padding: var(--section-space) 0;
        }
        .section-alt {
            background: #fff;
        }
        .section-deep {
            background: var(--bg-deep);
            color: #fff;
        }
        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent-soft);
            color: var(--accent-dark);
            padding: 6px 18px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .section-head h2 {
            font-size: clamp(26px, 3vw, 36px);
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 14px;
            letter-spacing: -0.3px;
        }
        .section-head p {
            color: var(--text-muted);
            font-size: 16px;
            line-height: 1.7;
        }
        .section-deep .section-head h2 {
            color: #fff;
        }
        .section-deep .section-head p {
            color: rgba(255, 255, 255, 0.6);
        }

        /* ========== 核心说明 ========== */
        .core-img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
        }
        .core-content {
            padding-left: 20px;
        }
        .core-content .section-tag {
            margin-bottom: 14px;
        }
        .core-content h2 {
            font-size: 30px;
            font-weight: 800;
            line-height: 1.35;
            margin-bottom: 18px;
            color: var(--text);
        }
        .core-content p {
            color: var(--text-body);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .core-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .core-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 0;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
        }
        .core-list li i {
            color: var(--accent);
            font-size: 18px;
        }

        /* ========== 特性卡片 ========== */
        .features-grid .cell {
            margin-bottom: 24px;
        }
        .feature-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 34px 28px;
            height: 100%;
            transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 22px;
            background: var(--accent-soft);
            color: var(--accent);
        }
        .feature-card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }
        .feature-card p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.75;
            margin-bottom: 0;
        }

        /* ========== 分类入口 ========== */
        .category-grid .cell {
            margin-bottom: 24px;
        }
        .category-card {
            display: flex;
            flex-direction: row;
            align-items: center;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            height: 100%;
            transition: transform 0.28s ease, box-shadow 0.28s ease;
        }
        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        .category-card-img {
            width: 42%;
            overflow: hidden;
        }
        .category-card-img img {
            width: 100%;
            height: 220px;
            object-fit: cover;
        }
        .category-card-body {
            flex: 1;
            padding: 32px 30px;
        }
        .category-card-body h3 {
            font-size: 21px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }
        .category-card-body p {
            color: var(--text-body);
            font-size: 15px;
            line-height: 1.7;
            margin-bottom: 18px;
        }

        /* ========== 最新资讯列表 ========== */
        .section-news {
            background: #fff;
        }
        .news-list {
            max-width: 860px;
            margin: 0 auto;
        }
        .news-item {
            display: flex;
            flex-direction: column;
            gap: 8px;
            padding: 26px 30px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            background: var(--bg);
            margin-bottom: 14px;
            transition: background 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
        }
        .news-item:hover {
            background: #fff;
            transform: translateX(4px);
            box-shadow: var(--shadow);
        }
        .news-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .tag-cat {
            display: inline-block;
            padding: 4px 14px;
            background: var(--accent-soft);
            color: var(--accent-dark);
            border-radius: 999px;
            font-weight: 600;
            font-size: 12px;
        }
        .news-item h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 0;
        }
        .news-item h3 a {
            color: var(--text);
        }
        .news-item h3 a:hover {
            color: var(--accent);
        }
        .news-item p {
            font-size: 15px;
            color: var(--text-body);
            margin-bottom: 0;
            line-height: 1.7;
        }
        .news-empty {
            text-align: center;
            color: var(--text-muted);
            padding: 40px 0;
            font-size: 16px;
        }

        /* ========== 数据统计 ========== */
        .section-stats {
            position: relative;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-color: var(--bg-deep);
            color: #fff;
        }
        .section-stats::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(7, 15, 26, 0.88);
        }
        .stats-wrap {
            position: relative;
            z-index: 2;
        }
        .stat-card {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius);
            padding: 30px 24px;
            text-align: center;
            height: 100%;
            backdrop-filter: blur(8px);
        }
        .stat-num {
            display: block;
            font-size: 40px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 6px;
            letter-spacing: -0.8px;
        }
        .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
        }

        /* ========== 流程步骤 ========== */
        .steps-grid .cell {
            margin-bottom: 24px;
        }
        .step-card {
            text-align: center;
            padding: 30px 22px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            height: 100%;
            transition: transform 0.26s ease, box-shadow 0.26s ease;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .step-num {
            width: 46px;
            height: 46px;
            margin: 0 auto 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff;
            font-weight: 800;
            font-size: 18px;
            box-shadow: 0 6px 16px rgba(244, 106, 44, 0.3);
        }
        .step-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-body);
            margin-bottom: 0;
            line-height: 1.7;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 14px;
            overflow: hidden;
            transition: box-shadow 0.25s ease;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-item summary {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 26px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            list-style: none;
            gap: 16px;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f054';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 13px;
            color: var(--text-muted);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item[open] summary::after {
            transform: rotate(90deg);
            color: var(--accent);
        }
        .faq-answer {
            padding: 0 26px 22px;
            color: var(--text-body);
            font-size: 15px;
            line-height: 1.75;
            border-top: 1px solid var(--border);
            padding-top: 16px;
        }

        /* ========== CTA ========== */
        .cta-band {
            position: relative;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            background-color: var(--bg-deep);
            padding: 90px 0;
            text-align: center;
            color: #fff;
        }
        .cta-band::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(6, 13, 24, 0.92), rgba(11, 26, 46, 0.8));
        }
        .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 680px;
            margin: 0 auto;
        }
        .cta-inner h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 14px;
        }
        .cta-inner p {
            color: rgba(255, 255, 255, 0.72);
            font-size: 17px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .cta-btns {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.65);
            padding: 72px 0 32px;
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 22px;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.5);
            max-width: 340px;
            margin-top: 10px;
        }
        .footer-heading {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            margin-top: 64px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.36);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            :root {
                --section-space: 74px;
            }
            .hero {
                padding: 96px 0 84px;
            }
            .features-grid .cell,
            .stat-card {
                margin-bottom: 18px;
            }
            .category-card-img {
                width: 38%;
            }
            .category-card-img img {
                height: 190px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-space: 60px;
            }
            .header-inner {
                height: 64px;
            }
            .menu-toggle {
                display: flex;
            }
            .site-nav {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                flex-direction: column;
                background: #fff;
                border-bottom: 1px solid var(--border);
                padding: 0 24px;
                max-height: 0;
                overflow: hidden;
                gap: 0;
                margin: 0;
                margin-left: 0;
                box-shadow: 0 16px 30px rgba(11, 26, 46, 0.08);
                transition: max-height 0.32s ease, padding 0.32s ease;
            }
            .site-nav.open {
                max-height: 260px;
                padding: 14px 24px;
            }
            .nav-link {
                padding: 13px 4px;
                border-bottom: 1px solid var(--border);
                width: 100%;
            }
            .nav-link::after {
                display: none;
            }
            .nav-link.active {
                color: var(--accent);
            }
            .header-cta {
                display: none;
            }
            .hero {
                padding: 74px 0 68px;
            }
            .hero-copy h1 {
                font-size: 30px;
            }
            .hero-actions {
                margin-bottom: 36px;
            }
            .hero-stats {
                gap: 22px;
                padding-top: 22px;
            }
            .hero-stat-value {
                font-size: 20px;
            }
            .hero-panel {
                margin-top: 44px;
                padding: 20px;
            }
            .core-content {
                padding-left: 0;
                margin-top: 32px;
            }
            .category-card {
                flex-direction: column;
            }
            .category-card-img {
                width: 100%;
            }
            .category-card-img img {
                height: 180px;
                width: 100%;
            }
            .category-card-body {
                padding: 24px;
            }
            .news-item {
                padding: 20px;
            }
            .stat-num {
                font-size: 32px;
            }
            .cta-inner h2 {
                font-size: 26px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 18px;
            }
            .hero {
                padding: 60px 0 54px;
            }
            .hero-copy h1 {
                font-size: 26px;
            }
            .hero-copy p.lead {
                font-size: 15px;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .panel-form .btn {
                width: 100%;
            }
            .section-head {
                margin-bottom: 38px;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .category-card-body {
                padding: 20px;
            }
            .news-meta {
                flex-wrap: wrap;
                gap: 8px;
            }
            .steps-grid .cell {
                margin-bottom: 14px;
            }
            .faq-item summary {
                padding: 16px 18px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 18px 18px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #2563eb;
            --primary-dark: #1e40af;
            --secondary: #06b6d4;
            --accent: #f59e0b;
            --bg: #f8fafc;
            --bg-alt: #f1f5f9;
            --surface: #ffffff;
            --text: #0f172a;
            --text-weak: #64748b;
            --border: #e2e8f0;
            --dark: #0b1220;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 10px 30px rgba(2, 6, 23, .08);
            --shadow-lg: 0 20px 48px rgba(2, 6, 23, .12);
            --spacing: 92px;
            --spacing-sm: 56px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            color: var(--text);
            background: var(--bg);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color .25s ease;
        }

        a:focus-visible,
        button:focus-visible,
        summary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, .4);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        /* ===== Header / 极简高端文字导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .86);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 74px;
        }

        .logo {
            font-size: 23px;
            font-weight: 800;
            letter-spacing: -.5px;
            color: var(--text);
            white-space: nowrap;
        }

        .logo span {
            color: var(--primary);
        }

        .site-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-link {
            position: relative;
            display: inline-block;
            padding: 8px 20px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-weak);
            transition: background .25s, color .25s;
        }

        .nav-link:hover {
            color: var(--primary);
            background: rgba(37, 99, 235, .06);
        }

        .nav-link.active {
            color: var(--primary);
            background: rgba(37, 99, 235, .08);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 3px;
            transform: translateX(-50%);
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--primary);
        }

        .nav-toggle {
            display: none;
            background: transparent;
            border: 0;
            font-size: 22px;
            color: var(--text);
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background .2s;
        }

        .nav-toggle:hover {
            background: var(--bg-alt);
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 110px 0 90px;
            background-size: cover;
            background-position: center;
            color: #fff;
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(110deg, rgba(2, 6, 23, .82) 20%, rgba(2, 6, 23, .45) 100%);
        }

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

        .page-hero h1 {
            font-size: clamp(30px, 5vw, 48px);
            font-weight: 800;
            line-height: 1.2;
            margin: 18px 0 16px;
            letter-spacing: -.5px;
            max-width: 720px;
        }

        .page-hero p {
            font-size: 17px;
            color: rgba(255, 255, 255, .82);
            max-width: 620px;
            margin-bottom: 30px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, .72);
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, .82);
            transition: color .2s;
        }

        .breadcrumb a:hover {
            color: #fff;
        }

        .breadcrumb i {
            font-size: 10px;
            color: rgba(255, 255, 255, .4);
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        /* ===== Button ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 600;
            line-height: 1;
            border: 2px solid transparent;
            cursor: pointer;
            transition: transform .25s, box-shadow .25s, background .25s, border-color .25s;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(37, 99, 235, .35);
        }

        .btn-outline {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, .7);
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, .12);
            border-color: #fff;
            transform: translateY(-2px);
        }

        .btn-light {
            background: #fff;
            color: var(--primary);
        }

        .btn-light:hover {
            background: #eef2ff;
            transform: translateY(-2px);
            box-shadow: 0 10px 26px rgba(0, 0, 0, .16);
        }

        .btn-ghost {
            background: rgba(255, 255, 255, .12);
            color: #fff;
            border-color: rgba(255, 255, 255, .55);
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, .2);
            transform: translateY(-2px);
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: var(--spacing) 0;
        }

        .section-alt {
            background: var(--bg-alt);
        }

        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 50px;
        }

        .section-head h2 {
            font-size: clamp(26px, 3.4vw, 36px);
            font-weight: 800;
            letter-spacing: -.5px;
            margin: 10px 0 14px;
            line-height: 1.3;
        }

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

        .eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--secondary);
        }

        .eyebrow.light {
            color: #7dd3fc;
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--surface);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: transform .3s, box-shadow .3s;
            border: 1px solid transparent;
        }

        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(37, 99, 235, .12);
        }

        .card-media img {
            width: 100%;
            height: 230px;
            object-fit: cover;
        }

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

        .card-body h3 {
            font-size: 19px;
            font-weight: 700;
            margin: 14px 0 10px;
            letter-spacing: -.3px;
        }

        .card-body p {
            color: var(--text-weak);
            font-size: 14.5px;
            margin-bottom: 18px;
            flex: 1;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            background: #eff6ff;
            color: var(--primary);
            width: max-content;
        }

        .badge-secondary {
            background: #ecfeff;
            color: #0891b2;
        }

        .badge-accent {
            background: #fef3c7;
            color: #d97706;
        }

        .link-arrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 14px;
            color: var(--primary);
            transition: gap .2s;
        }

        .link-arrow:hover {
            gap: 12px;
        }

        /* ===== 登录分步指南 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .step-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 30px;
            transition: transform .3s, box-shadow .3s, border-color .3s;
        }

        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: rgba(37, 99, 235, .25);
        }

        .step-number {
            width: 46px;
            height: 46px;
            border-radius: 12px;
            background: var(--primary);
            color: #fff;
            font-size: 18px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            box-shadow: 0 6px 16px rgba(37, 99, 235, .28);
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-weak);
            margin-bottom: 0;
        }

        /* ===== 多端支持 ===== */
        .feature-list {
            list-style: none;
            margin: 24px 0 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .feature-list li {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 15px;
            color: var(--text);
            padding: 14px 18px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            transition: border-color .25s, box-shadow .25s;
        }

        .feature-list li:hover {
            border-color: rgba(37, 99, 235, .3);
            box-shadow: var(--shadow);
        }

        .feature-list li i {
            color: var(--primary);
            font-size: 18px;
            width: 24px;
            text-align: center;
            flex-shrink: 0;
        }

        .radius-16 {
            border-radius: var(--radius);
        }

        .shadow {
            box-shadow: var(--shadow);
        }

        .stat-row {
            display: flex;
            flex-wrap: wrap;
            gap: 36px;
            margin-top: 34px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
        }

        .stat-item strong {
            display: block;
            font-size: 28px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -1px;
        }

        .stat-item span {
            font-size: 13px;
            color: var(--text-weak);
        }

        /* ===== 安全提示 band ===== */
        .security-band {
            background: var(--dark);
            color: #fff;
            padding: 84px 0;
            position: relative;
            overflow: hidden;
        }

        .security-band::after {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 360px;
            height: 360px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(6, 182, 212, .25), transparent 70%);
            pointer-events: none;
        }

        .security-inner {
            position: relative;
            z-index: 1;
        }

        .security-inner h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            margin: 10px 0 40px;
            letter-spacing: -.4px;
        }

        .security-item {
            background: rgba(255, 255, 255, .06);
            border: 1px solid rgba(255, 255, 255, .1);
            border-radius: var(--radius);
            padding: 26px 22px;
            height: 100%;
            transition: background .25s, border-color .25s;
        }

        .security-item:hover {
            background: rgba(255, 255, 255, .1);
            border-color: rgba(255, 255, 255, .2);
        }

        .security-item i {
            font-size: 26px;
            color: var(--secondary);
            margin-bottom: 14px;
        }

        .security-item h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .security-item p {
            font-size: 14px;
            color: rgba(255, 255, 255, .72);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 14px;
            overflow: hidden;
            transition: border-color .25s, box-shadow .25s;
        }

        .faq-item:hover {
            border-color: rgba(37, 99, 235, .25);
        }

        .faq-item summary {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary::after {
            content: '+';
            font-size: 20px;
            color: var(--primary);
            flex-shrink: 0;
        }

        .faq-item[open] summary::after {
            content: '−';
        }

        .faq-item p {
            padding: 0 24px 20px;
            color: var(--text-weak);
            font-size: 15px;
            margin: 0;
        }

        /* ===== CTA ===== */
        .cta-band {
            padding: 84px 0;
        }

        .cta-box {
            background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 40%, #0891b2 100%);
            border-radius: 24px;
            padding: 58px;
            text-align: center;
            color: #fff;
            box-shadow: 0 20px 48px rgba(37, 99, 235, .3);
            position: relative;
            overflow: hidden;
        }

        .cta-box::before {
            content: '';
            position: absolute;
            top: -60px;
            left: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, .08);
            pointer-events: none;
        }

        .cta-box h2 {
            font-size: clamp(24px, 3vw, 34px);
            font-weight: 800;
            margin: 0 0 12px;
            letter-spacing: -.5px;
            position: relative;
            z-index: 1;
        }

        .cta-box p {
            font-size: 16px;
            color: rgba(255, 255, 255, .85);
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
        }

        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
            position: relative;
            z-index: 1;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--dark);
            color: #94a3b8;
            padding: 54px 0 0;
            font-size: 14px;
        }

        .site-footer .footer-brand .logo {
            color: #fff;
            margin-bottom: 12px;
        }

        .site-footer .footer-brand p {
            margin: 14px 0 0;
            max-width: 340px;
            color: #94a3b8;
            line-height: 1.8;
        }

        .footer-heading {
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            margin-bottom: 16px;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: #94a3b8;
            transition: color .2s;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .footer-links span {
            color: #64748b;
        }

        .footer-bottom {
            margin-top: 42px;
            padding: 18px 0;
            border-top: 1px solid rgba(255, 255, 255, .08);
            text-align: center;
            color: #64748b;
            font-size: 13px;
        }

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

            .page-hero {
                padding: 80px 0 64px;
            }
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }

            .site-nav {
                display: none;
                position: absolute;
                top: 74px;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--border);
                flex-direction: column;
                align-items: stretch;
                padding: 16px 24px 24px;
                box-shadow: 0 20px 40px rgba(2, 6, 23, .1);
                border-radius: 0 0 16px 16px;
            }

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

            .nav-link {
                width: 100%;
                text-align: center;
                padding: 13px 16px;
            }

            .nav-link.active::after {
                display: none;
            }

            .section {
                padding: var(--spacing-sm) 0;
            }

            .card-media img {
                height: 200px;
            }

            .stat-row {
                gap: 24px;
            }

            .security-band {
                padding: 60px 0;
            }

            .cta-box {
                padding: 40px 24px;
            }

            .cta-actions .btn {
                width: 100%;
            }

            .page-hero h1 {
                font-size: 30px;
            }

            .hero-actions .btn {
                width: 100%;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 18px;
            }

            .steps-grid {
                grid-template-columns: 1fr;
            }

            .stat-row {
                flex-direction: column;
                gap: 18px;
            }

            .feature-list li {
                padding: 12px 14px;
            }

            .section-head {
                margin-bottom: 34px;
            }

            .card-body {
                padding: 20px;
            }
        }

/* roulang page: article */
:root {
        --primary: #0b1f3a;
        --primary-light: #142b4b;
        --accent: #00d4a7;
        --accent-dark: #00b890;
        --blue: #4a7cf7;
        --bg: #f4f7fb;
        --bg-alt: #eef1f6;
        --text: #1a2332;
        --text-light: #5b6b80;
        --text-muted: #8a95a6;
        --border: #e2e8f0;
        --radius: 18px;
        --radius-sm: 10px;
        --radius-lg: 28px;
        --shadow-sm: 0 2px 10px rgba(11, 31, 58, 0.06);
        --shadow: 0 10px 35px rgba(11, 31, 58, 0.10);
        --shadow-lg: 0 20px 50px rgba(11, 31, 58, 0.16);
        --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        --container-width: 1200px;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        line-height: 1.7;
        color: var(--text);
        background: var(--bg);
        -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font-family: inherit; }
    .container {
        max-width: var(--container-width);
        margin: 0 auto;
        padding: 0 28px;
        width: 100%;
        position: relative;
    }

    .site-header {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        position: sticky;
        top: 0;
        z-index: 100;
        height: 74px;
        transition: var(--transition);
    }
    .site-header.scrolled { box-shadow: var(--shadow-sm); }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 100%;
        gap: 24px;
    }
    .logo {
        font-size: 24px;
        font-weight: 800;
        color: var(--primary);
        letter-spacing: -0.02em;
        white-space: nowrap;
        display: flex;
        align-items: center;
    }
    .logo span { color: var(--accent); }
    .site-nav { display: flex; align-items: center; gap: 30px; }
    .nav-link {
        font-size: 15px;
        font-weight: 600;
        color: var(--text-light);
        position: relative;
        padding: 8px 2px;
        letter-spacing: 0.01em;
        border-radius: 0;
    }
    .nav-link::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        width: 0;
        height: 2px;
        background: var(--accent);
        border-radius: 2px;
        transition: var(--transition);
    }
    .nav-link:hover { color: var(--primary); }
    .nav-link:hover::after { width: 100%; }
    .nav-link.active { color: var(--primary); }
    .nav-link.active::after { width: 100%; }
    .header-actions { display: flex; align-items: center; gap: 16px; margin-left: auto; }
    .header-btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 9px 22px;
        border-radius: 50px;
        background: var(--primary);
        color: #fff;
        font-size: 14px;
        font-weight: 600;
        transition: var(--transition);
        border: none;
        cursor: pointer;
        white-space: nowrap;
    }
    .header-btn:hover {
        background: var(--accent);
        color: var(--primary);
        transform: translateY(-1px);
        box-shadow: var(--shadow);
    }
    .nav-toggle {
        display: none;
        background: none;
        border: none;
        font-size: 22px;
        color: var(--primary);
        cursor: pointer;
        padding: 6px;
        line-height: 1;
    }

    .article-hero {
        background: linear-gradient(135deg, rgba(11, 31, 58, 0.94), rgba(20, 43, 75, 0.86)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
        padding: 120px 0 96px;
        color: #fff;
        position: relative;
        overflow: hidden;
    }
    .article-hero::before {
        content: '';
        position: absolute;
        top: -60%;
        right: -20%;
        width: 500px;
        height: 500px;
        background: radial-gradient(circle, rgba(0, 212, 167, 0.2), transparent 60%);
        pointer-events: none;
    }
    .article-hero .container { max-width: 900px; z-index: 2; }
    .breadcrumb {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 10px;
        font-size: 14px;
        margin-bottom: 28px;
        color: rgba(255, 255, 255, 0.65);
    }
    .breadcrumb a { color: rgba(255, 255, 255, 0.85); transition: var(--transition); }
    .breadcrumb a:hover { color: var(--accent); }
    .breadcrumb i { font-size: 10px; color: rgba(255, 255, 255, 0.4); }
    .article-title {
        font-size: 40px;
        line-height: 1.3;
        font-weight: 800;
        letter-spacing: -0.02em;
        margin-bottom: 20px;
        word-break: break-word;
    }
    .article-meta {
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
        font-size: 14px;
        color: rgba(255, 255, 255, 0.75);
    }
    .article-meta span {
        display: inline-flex;
        align-items: center;
        gap: 8px;
    }
    .article-meta i { color: var(--accent); }

    .article-body-section {
        padding: 0 0 80px;
        position: relative;
        z-index: 3;
        margin-top: -30px;
    }
    .article-content-card {
        background: #fff;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow);
        padding: 54px;
        max-width: 900px;
        margin: 0 auto;
        border: 1px solid rgba(255, 255, 255, 0.8);
    }
    .article-content {
        font-size: 16.5px;
        line-height: 1.9;
        color: var(--text);
    }
    .article-content h2 {
        font-size: 26px;
        font-weight: 800;
        margin: 36px 0 18px;
        color: var(--primary);
        letter-spacing: -0.01em;
    }
    .article-content h3 {
        font-size: 20px;
        font-weight: 700;
        margin: 28px 0 14px;
        color: var(--primary);
    }
    .article-content p { margin-bottom: 18px; }
    .article-content ul, .article-content ol { margin: 0 0 22px 22px; }
    .article-content li { margin-bottom: 8px; }
    .article-content a {
        color: var(--accent-dark);
        border-bottom: 1px solid rgba(0, 212, 167, 0.4);
    }
    .article-content a:hover { color: var(--primary); border-color: var(--primary); }
    .article-content blockquote {
        border-left: 4px solid var(--accent);
        padding: 18px 26px;
        background: var(--bg-alt);
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        margin: 26px 0;
        color: var(--text-light);
        font-style: normal;
    }
    .article-content blockquote p { margin-bottom: 0; }
    .article-content img {
        border-radius: var(--radius);
        margin: 24px 0;
        box-shadow: var(--shadow-sm);
    }
    .article-footer-info {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        margin-top: 42px;
        padding-top: 24px;
        border-top: 1px solid var(--border);
    }
    .badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 6px 16px;
        border-radius: 50px;
        background: var(--bg-alt);
        color: var(--primary);
        font-size: 13px;
        font-weight: 600;
        border: 1px solid var(--border);
    }
    .badge-accent {
        background: rgba(0, 212, 167, 0.12);
        color: var(--accent-dark);
        border-color: rgba(0, 212, 167, 0.3);
    }

    .not-found {
        text-align: center;
        padding: 80px 40px;
        background: #fff;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow);
        max-width: 620px;
        margin: 30px auto 0;
    }
    .not-found i {
        font-size: 48px;
        color: var(--accent);
        margin-bottom: 20px;
        display: inline-block;
    }
    .not-found h2 {
        font-size: 28px;
        color: var(--primary);
        margin-bottom: 12px;
    }
    .not-found p {
        color: var(--text-light);
        margin-bottom: 28px;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        padding: 13px 30px;
        border-radius: 50px;
        font-size: 15px;
        font-weight: 600;
        transition: var(--transition);
        border: none;
        cursor: pointer;
        line-height: 1.4;
    }
    .btn:focus {
        outline: 3px solid rgba(0, 212, 167, 0.45);
        outline-offset: 3px;
    }
    .btn-primary {
        background: var(--primary);
        color: #fff;
    }
    .btn-primary:hover {
        background: var(--accent);
        color: var(--primary);
        transform: translateY(-2px);
        box-shadow: var(--shadow);
    }
    .btn-outline {
        background: transparent;
        color: var(--primary);
        border: 1.5px solid var(--primary);
    }
    .btn-outline:hover {
        background: var(--primary);
        color: #fff;
        transform: translateY(-2px);
        box-shadow: var(--shadow);
    }
    .btn-lg {
        padding: 16px 42px;
        font-size: 16px;
    }

    .related-cats {
        padding: 40px 0 90px;
        background: var(--bg);
    }
    .section-head {
        text-align: center;
        margin-bottom: 52px;
    }
    .section-head h2 {
        font-size: 34px;
        font-weight: 800;
        color: var(--primary);
        letter-spacing: -0.02em;
        margin-bottom: 12px;
    }
    .section-head p {
        color: var(--text-light);
        font-size: 16px;
    }
    .grid-x { display: flex; flex-wrap: wrap; }
    .cell { width: 100%; }
    .cat-card {
        background: #fff;
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        transition: var(--transition);
        height: 100%;
        display: flex;
        flex-direction: column;
        border: 1px solid var(--border);
    }
    .cat-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-lg);
    }
    .cat-card img {
        width: 100%;
        height: 210px;
        object-fit: cover;
        transition: transform 0.5s ease;
    }
    .cat-card:hover img { transform: scale(1.04); }
    .cat-card-content {
        padding: 30px;
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .cat-card-content h3 {
        font-size: 22px;
        font-weight: 700;
        color: var(--primary);
    }
    .cat-card-content p {
        color: var(--text-light);
        font-size: 15px;
        line-height: 1.7;
        flex: 1;
    }
    .cat-card-content .btn { margin-top: 8px; }

    .faq-section {
        padding: 90px 0;
        background: #fff;
    }
    .faq-item {
        background: var(--bg);
        border-radius: var(--radius);
        padding: 28px 30px;
        margin-bottom: 20px;
        border-left: 3px solid var(--accent);
        transition: var(--transition);
    }
    .faq-item:hover {
        box-shadow: var(--shadow);
        transform: translateX(4px);
    }
    .faq-item h3 {
        font-size: 17px;
        font-weight: 700;
        color: var(--primary);
        margin-bottom: 10px;
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .faq-item h3 i { color: var(--accent); font-size: 16px; }
    .faq-item p {
        color: var(--text-light);
        font-size: 15px;
        line-height: 1.7;
        margin-left: 26px;
    }

    .cta-section {
        background: linear-gradient(135deg, rgba(11, 31, 58, 0.95), rgba(0, 212, 167, 0.12)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
        padding: 100px 0;
        text-align: center;
        color: #fff;
        position: relative;
    }
    .cta-section .container { position: relative; z-index: 2; }
    .cta-section h2 {
        font-size: 36px;
        font-weight: 800;
        margin-bottom: 16px;
        letter-spacing: -0.02em;
    }
    .cta-section p {
        font-size: 17px;
        color: rgba(255, 255, 255, 0.8);
        margin-bottom: 34px;
        max-width: 560px;
        margin-left: auto;
        margin-right: auto;
    }
    .cta-section .btn-primary {
        background: #fff;
        color: var(--primary);
    }
    .cta-section .btn-primary:hover {
        background: var(--accent);
        color: var(--primary);
        transform: translateY(-2px);
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    }

    .site-footer {
        background: var(--primary);
        color: rgba(255, 255, 255, 0.7);
        padding: 70px 0 0;
    }
    .site-footer .grid-x { display: flex; flex-wrap: wrap; margin: 0 -15px; }
    .site-footer .cell { padding: 0 15px; margin-bottom: 40px; }
    .footer-brand .logo {
        color: #fff;
        font-size: 26px;
        margin-bottom: 16px;
        display: inline-block;
    }
    .footer-brand p {
        font-size: 15px;
        line-height: 1.8;
        max-width: 360px;
        margin-top: 10px;
    }
    .footer-heading {
        font-size: 17px;
        font-weight: 700;
        color: #fff;
        margin-bottom: 18px;
        position: relative;
        padding-bottom: 10px;
    }
    .footer-heading::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        width: 28px;
        height: 2px;
        background: var(--accent);
        border-radius: 2px;
    }
    .footer-links {
        display: flex;
        flex-direction: column;
        gap: 12px;
        font-size: 15px;
    }
    .footer-links a {
        color: rgba(255, 255, 255, 0.65);
        transition: var(--transition);
        width: fit-content;
    }
    .footer-links a:hover {
        color: var(--accent);
        padding-left: 4px;
    }
    .footer-links span { color: rgba(255, 255, 255, 0.55); }
    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        padding: 24px 0;
        text-align: center;
        font-size: 14px;
        color: rgba(255, 255, 255, 0.4);
    }

    @media (max-width: 1024px) {
        .article-hero { padding: 96px 0 76px; }
        .article-title { font-size: 34px; }
        .article-content-card { padding: 40px; }
        .related-cats { padding: 30px 0 70px; }
        .faq-section { padding: 70px 0; }
        .cta-section { padding: 80px 0; }
        .section-head h2 { font-size: 30px; }
    }
    @media (max-width: 768px) {
        .site-header { height: 64px; }
        .header-inner { gap: 16px; }
        .logo { font-size: 20px; }
        .header-btn { display: none; }
        .nav-toggle { display: block; }
        .site-nav {
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            background: #fff;
            flex-direction: column;
            align-items: flex-start;
            padding: 24px 28px;
            gap: 18px;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow);
            transform: translateY(-120%);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 99;
        }
        .site-nav.open {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .nav-link { font-size: 16px; width: 100%; }
        .nav-link::after { display: none; }
        .article-hero { padding: 70px 0 56px; }
        .article-title { font-size: 28px; }
        .article-content-card { padding: 28px 22px; border-radius: 16px; }
        .article-content { font-size: 15.5px; line-height: 1.85; }
        .article-content h2 { font-size: 22px; }
        .article-content h3 { font-size: 18px; }
        .not-found { padding: 60px 24px; }
        .not-found h2 { font-size: 24px; }
        .cat-card img { height: 180px; }
        .cat-card-content { padding: 24px; }
        .cat-card-content h3 { font-size: 20px; }
        .section-head { margin-bottom: 38px; }
        .section-head h2 { font-size: 26px; }
        .faq-section { padding: 60px 0; }
        .faq-item { padding: 22px 20px; }
        .faq-item h3 { font-size: 16px; }
        .faq-item p { margin-left: 0; font-size: 14.5px; }
        .cta-section { padding: 70px 0; }
        .cta-section h2 { font-size: 28px; }
        .cta-section p { font-size: 15.5px; }
        .footer-brand .logo { font-size: 22px; }
    }
    @media (max-width: 520px) {
        .container { padding: 0 18px; }
        .logo { font-size: 17px; }
        .article-title { font-size: 23px; }
        .article-meta { gap: 12px; font-size: 13px; }
        .article-content-card { padding: 22px 16px; }
        .article-content { font-size: 15px; }
        .btn { padding: 11px 22px; font-size: 14px; }
        .btn-lg { padding: 14px 32px; font-size: 15px; }
        .cat-card-content { padding: 20px; }
        .cat-card-content h3 { font-size: 18px; }
        .cat-card img { height: 150px; }
        .section-head h2 { font-size: 23px; }
        .section-head p { font-size: 14px; }
        .cta-section h2 { font-size: 24px; }
        .cta-section p { font-size: 14px; }
        .footer-heading { font-size: 16px; }
        .footer-links { font-size: 14px; }
        .footer-bottom { font-size: 13px; }
    }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1e5eff;
            --primary-dark: #1443b8;
            --primary-light: #eaf0ff;
            --accent: #00c2ff;
            --accent-light: #e0f7ff;
            --dark-bg: #081426;
            --dark-bg-2: #0e1e36;
            --bg-light: #f6f8fc;
            --bg-white: #ffffff;
            --text-main: #16293c;
            --text-weak: #66788c;
            --text-light: #f3f7ff;
            --border: #e3e9f2;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 6px 30px rgba(16, 42, 84, .08);
            --shadow-hover: 0 14px 44px rgba(16, 42, 84, .15);
            --transition: all .3s cubic-bezier(.4, 0, .2, 1);
            --container: 1200px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "HarmonicOS Sans", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-main);
            background: var(--bg-white);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
            height: auto;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        button {
            border: none;
            background: none;
            cursor: pointer;
            font-family: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 导航 ===== */
        .site-header {
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
        }
        .logo {
            font-size: 1.32rem;
            font-weight: 800;
            letter-spacing: .01em;
            color: var(--text-main);
            white-space: nowrap;
        }
        .logo span {
            color: var(--primary);
            background: var(--primary-light);
            padding: 2px 10px;
            border-radius: 6px;
            font-size: .92em;
            margin: 0 2px;
            display: inline-block;
        }
        .site-nav {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        .nav-link {
            font-size: .95rem;
            font-weight: 500;
            color: var(--text-weak);
            position: relative;
            padding: 8px 2px;
            letter-spacing: .02em;
        }
        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 0;
            height: 2px;
            border-radius: 2px;
            background: var(--primary);
            transition: width .35s cubic-bezier(.4, 0, .2, 1);
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            width: 100%;
        }
        .nav-toggle {
            display: none;
            font-size: 1.35rem;
            color: var(--text-main);
            width: 44px;
            height: 44px;
            border-radius: 10px;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border);
            background: var(--bg-white);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
            color: var(--primary);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            background: linear-gradient(135deg, rgba(8, 20, 38, .92), rgba(14, 30, 54, .82)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            padding: 140px 0 120px;
            color: var(--text-light);
            overflow: hidden;
        }
        .hero::before {
            content: "";
            position: absolute;
            top: -60%;
            right: -20%;
            width: 560px;
            height: 560px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 194, 255, .18), transparent 70%);
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr .9fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, .12);
            border: 1px solid rgba(255, 255, 255, .18);
            padding: 6px 16px;
            border-radius: 999px;
            font-size: .82rem;
            letter-spacing: .08em;
            font-weight: 500;
            color: var(--accent);
            margin-bottom: 24px;
            backdrop-filter: blur(6px);
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent);
            box-shadow: 0 0 12px var(--accent);
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: .6;
                transform: scale(.8);
            }
        }
        .hero-title {
            font-size: clamp(2.4rem, 4.4vw, 3.6rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: .01em;
            margin-bottom: 20px;
        }
        .hero-title .grad {
            background: linear-gradient(120deg, var(--accent), #6ee7ff);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-subtitle {
            font-size: 1.08rem;
            color: rgba(255, 255, 255, .78);
            line-height: 1.8;
            max-width: 540px;
            margin-bottom: 36px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 32px;
            border-radius: 999px;
            font-size: .95rem;
            font-weight: 600;
            letter-spacing: .02em;
            transition: var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 20px rgba(30, 94, 255, .35);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 30px rgba(30, 94, 255, .45);
            transform: translateY(-2px);
        }
        .btn-ghost {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, .45);
        }
        .btn-ghost:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, .08);
            transform: translateY(-2px);
        }
        .hero-panel {
            background: rgba(255, 255, 255, .1);
            border: 1px solid rgba(255, 255, 255, .16);
            border-radius: 24px;
            padding: 32px 28px;
            backdrop-filter: blur(16px);
            box-shadow: 0 20px 60px rgba(0, 0, 0, .25);
        }
        .panel-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 24px;
            padding-bottom: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, .14);
        }
        .panel-title {
            font-size: .95rem;
            font-weight: 600;
            color: #fff;
        }
        .panel-status {
            font-size: .78rem;
            color: var(--accent);
            background: rgba(0, 194, 255, .16);
            padding: 4px 12px;
            border-radius: 999px;
            font-weight: 600;
        }
        .panel-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
        }
        .panel-label {
            font-size: .88rem;
            color: rgba(255, 255, 255, .68);
        }
        .panel-value {
            font-size: .92rem;
            font-weight: 600;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .panel-value .ok {
            color: #4ade80;
        }
        .panel-value .warn {
            color: #fbbf24;
        }
        .panel-bar {
            height: 4px;
            border-radius: 4px;
            background: rgba(255, 255, 255, .12);
            overflow: hidden;
            margin-top: 8px;
        }
        .panel-bar .fill {
            height: 100%;
            border-radius: 4px;
            background: linear-gradient(90deg, var(--accent), var(--primary));
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 110px 0;
        }
        .section-light {
            background: var(--bg-light);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-head {
            max-width: 640px;
            margin-bottom: 60px;
        }
        .section-head.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section-tag {
            display: inline-block;
            font-size: .78rem;
            font-weight: 700;
            letter-spacing: .14em;
            text-transform: uppercase;
            color: var(--primary);
            background: var(--primary-light);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: 16px;
        }
        .section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: .01em;
            margin-bottom: 14px;
        }
        .section-desc {
            font-size: 1rem;
            color: var(--text-weak);
            line-height: 1.8;
        }

        /* ===== 安全防护体系 ===== */
        .security-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 70px;
            align-items: center;
        }
        .security-image {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
            transition: var(--transition);
        }
        .security-image img {
            width: 100%;
            height: 440px;
            object-fit: cover;
            transition: transform .6s ease;
        }
        .security-image:hover img {
            transform: scale(1.03);
        }
        .security-image::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(8, 20, 38, .18), transparent 45%);
        }
        .security-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px 24px;
            margin-top: 12px;
        }
        .security-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 24px 20px;
            transition: var(--transition);
        }
        .security-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .security-item .icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 16px;
        }
        .security-item h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .security-item p {
            font-size: .88rem;
            color: var(--text-weak);
            line-height: 1.6;
        }

        /* ===== 功能卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 20px;
        }
        .feature-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 36px 26px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform .45s cubic-bezier(.4, 0, .2, 1);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
        }
        .feature-card:hover::before {
            transform: scaleX(1);
        }
        .feature-card .icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.45rem;
            margin-bottom: 22px;
        }
        .feature-card .icon.blue {
            background: var(--primary-light);
            color: var(--primary);
        }
        .feature-card .icon.cyan {
            background: var(--accent-light);
            color: #0891b2;
        }
        .feature-card .icon.green {
            background: #e7f9ee;
            color: #16a34a;
        }
        .feature-card .icon.orange {
            background: #fff4e5;
            color: #ea8c00;
        }
        .feature-card h3 {
            font-size: 1.12rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: .9rem;
            color: var(--text-weak);
            line-height: 1.7;
            margin-bottom: 0;
        }
        .feature-card .tag {
            display: inline-block;
            font-size: .72rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 999px;
            background: var(--bg-light);
            color: var(--text-weak);
            margin-top: 16px;
            letter-spacing: .03em;
        }

        /* ===== 数据指标 ===== */
        .stats-band {
            background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-2) 100%);
            padding: 90px 0;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .stats-band::before {
            content: "";
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 90%;
            height: 100%;
            background: radial-gradient(ellipse at center, rgba(30, 94, 255, .16), transparent 70%);
            pointer-events: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            position: relative;
            z-index: 2;
        }
        .stat-item {
            text-align: center;
            padding: 20px;
        }
        .stat-num {
            font-size: clamp(2.4rem, 4vw, 3.4rem);
            font-weight: 800;
            line-height: 1.2;
            background: linear-gradient(120deg, #fff, var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 8px;
        }
        .stat-label {
            font-size: .92rem;
            color: rgba(255, 255, 255, .68);
            letter-spacing: .04em;
        }
        .stat-bar {
            width: 48px;
            height: 3px;
            border-radius: 3px;
            background: rgba(255, 255, 255, .2);
            margin: 16px auto 0;
            overflow: hidden;
        }
        .stat-bar .fill {
            height: 100%;
            background: var(--accent);
            border-radius: 3px;
        }

        /* ===== 操作指南 ===== */
        .steps-wrapper {
            max-width: 900px;
            margin: 0 auto;
        }
        .step-item {
            display: grid;
            grid-template-columns: 70px 1fr;
            gap: 28px;
            padding: 36px 0;
            position: relative;
        }
        .step-item:not(:last-child)::before {
            content: "";
            position: absolute;
            left: 35px;
            top: 80px;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, var(--primary-light), var(--border));
        }
        .step-num {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 800;
            position: relative;
            z-index: 2;
            border: 4px solid #fff;
            box-shadow: 0 0 0 2px var(--primary-light);
            transition: var(--transition);
        }
        .step-item:hover .step-num {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 0 0 4px var(--primary-light);
            transform: scale(1.05);
        }
        .step-content {
            padding-top: 8px;
        }
        .step-content h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-content p {
            font-size: .94rem;
            color: var(--text-weak);
            line-height: 1.7;
            max-width: 620px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: #c6d3e8;
        }
        .faq-item.open {
            border-color: var(--primary-light);
            box-shadow: var(--shadow);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 22px 26px;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-main);
            background: transparent;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .icon {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--bg-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: .8rem;
            transition: var(--transition);
            color: var(--text-weak);
        }
        .faq-item.open .faq-question .icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .4s ease;
        }
        .faq-answer-inner {
            padding: 0 26px 24px;
            font-size: .93rem;
            color: var(--text-weak);
            line-height: 1.8;
            border-top: 1px solid var(--border);
            margin: 0 26px;
            padding: 18px 0 22px;
        }

        /* ===== CTA ===== */
        .cta {
            position: relative;
            background: linear-gradient(135deg, rgba(8, 20, 38, .94), rgba(14, 30, 54, .88)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            padding: 100px 0;
            text-align: center;
            color: #fff;
        }
        .cta-title {
            font-size: clamp(1.9rem, 3.4vw, 2.8rem);
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-desc {
            font-size: 1rem;
            color: rgba(255, 255, 255, .75);
            max-width: 560px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .cta .btn-primary {
            padding: 15px 44px;
            font-size: 1rem;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--dark-bg);
            color: rgba(255, 255, 255, .68);
            padding: 70px 0 30px;
            font-size: .92rem;
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 1.25rem;
            margin-bottom: 16px;
            display: inline-block;
        }
        .footer-brand .logo span {
            background: rgba(30, 94, 255, .2);
            color: var(--accent);
        }
        .footer-brand p {
            line-height: 1.8;
            color: rgba(255, 255, 255, .56);
            max-width: 360px;
            margin-bottom: 0;
        }
        .footer-heading {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 20px;
            letter-spacing: .02em;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, .6);
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-links span {
            color: rgba(255, 255, 255, .48);
            display: block;
            line-height: 1.6;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .08);
            padding-top: 24px;
            margin-top: 50px;
            text-align: center;
            font-size: .85rem;
            color: rgba(255, 255, 255, .4);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .security-grid {
                gap: 44px;
            }
            .security-image img {
                height: 360px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 30px;
            }
            .hero-grid {
                gap: 40px;
            }
        }
        @media (max-width: 768px) {
            .site-nav {
                position: fixed;
                top: 76px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                align-items: flex-start;
                padding: 24px 28px;
                gap: 18px;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 16px 40px rgba(0, 0, 0, .08);
                transform: translateY(-120%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
            }
            .site-nav.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .nav-toggle {
                display: flex;
            }
            .hero {
                padding: 90px 0 80px;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero-panel {
                max-width: 420px;
            }
            .security-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .security-list {
                grid-template-columns: 1fr;
            }
            .section {
                padding: 76px 0;
            }
            .section-head {
                margin-bottom: 40px;
            }
            .step-item {
                grid-template-columns: 56px 1fr;
                gap: 20px;
                padding: 26px 0;
            }
            .step-num {
                width: 56px;
                height: 56px;
                font-size: 1.1rem;
            }
            .step-item:not(:last-child)::before {
                left: 28px;
                top: 64px;
            }
            .footer-bottom {
                margin-top: 36px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 18px;
            }
            .header-inner {
                height: 66px;
            }
            .logo {
                font-size: 1.05rem;
            }
            .logo span {
                padding: 1px 7px;
                font-size: .88em;
            }
            .hero {
                padding: 70px 0 64px;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-subtitle {
                font-size: .95rem;
            }
            .hero-actions {
                flex-direction: column;
                gap: 12px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .security-item {
                padding: 20px 16px;
            }
            .faq-question {
                padding: 18px 18px;
                font-size: .94rem;
            }
            .footer-links {
                gap: 8px;
            }
        }