/* roulang page: index */
/* ========== 设计变量 ========== */
        :root {
            --color-primary: #2C6FD4;
            --color-primary-light: #EAF1F9;
            --color-primary-dark: #1C4373;
            --color-accent: #D9A441;
            --color-ink: #133A5B;
            --color-bg: #F5F8FB;
            --color-surface: #FFFFFF;
            --color-text: #2C3E50;
            --color-text-secondary: #5A6E82;
            --color-muted: #8A9BAB;
            --color-border: #E6EDF5;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 4px 20px rgba(18, 46, 74, 0.05);
            --shadow-md: 0 8px 30px rgba(18, 46, 74, 0.10);
            --container-width: 1200px;
            --header-height: 68px;
            --tab-height: 56px;
        }

        /* ========== Reset / Base ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            font-size: 16px;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
            padding-bottom: 0;
        }

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

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
        }

        a:hover {
            color: var(--color-primary-dark);
        }

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
        }

        /* ========== 容器 ========== */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .section {
            padding: 96px 0;
        }

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

        .section-head {
            text-align: center;
            margin-bottom: 56px;
        }

        .section-head .sub-label {
            display: inline-block;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 13px;
            font-weight: 500;
            padding: 4px 18px;
            border-radius: 24px;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .section-head h2 {
            font-size: clamp(24px, 3vw, 36px);
            font-weight: 600;
            line-height: 1.3;
            color: var(--color-ink);
            margin-bottom: 12px;
        }

        .section-head .divider-line {
            width: 36px;
            height: 4px;
            background: var(--color-primary);
            border-radius: 2px;
            margin: 14px auto 0;
        }

        .section-head p {
            color: var(--color-text-secondary);
            font-size: 16px;
            max-width: 640px;
            margin: 16px auto 0;
            line-height: 1.7;
        }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            border: 1px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
            gap: 8px;
            white-space: nowrap;
        }

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

        .btn-primary:hover {
            background: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
            color: #fff;
            box-shadow: 0 6px 20px rgba(44, 111, 212, 0.30);
            transform: translateY(-1px);
        }

        .btn-outline {
            background: var(--color-surface);
            color: var(--color-primary);
            border-color: var(--color-primary);
        }

        .btn-outline:hover {
            background: var(--color-primary-light);
            border-color: var(--color-primary-dark);
            color: var(--color-primary-dark);
        }

        .btn-accent {
            background: var(--color-accent);
            color: #1a2a3a;
            border-color: var(--color-accent);
            font-weight: 700;
        }

        .btn-accent:hover {
            background: #e8b453;
            border-color: #e8b453;
            color: #1a2a3a;
            box-shadow: 0 4px 16px rgba(217, 164, 65, 0.40);
            transform: translateY(-1px);
        }

        .btn-sm {
            height: 40px;
            padding: 0 20px;
            font-size: 14px;
        }

        .btn:active {
            transform: translateY(1px);
        }

        /* ========== 导航 ========== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: var(--header-height);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 4px rgba(18, 46, 74, 0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .brand {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary-dark);
            letter-spacing: 0.3px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .brand .brand-icon {
            width: 34px;
            height: 34px;
            background: var(--color-primary-light);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-primary);
            font-size: 16px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav .nav-link {
            font-size: 15px;
            color: var(--color-text);
            font-weight: 500;
            padding: 6px 2px;
            position: relative;
            border-bottom: 2px solid transparent;
            transition: color 0.2s, border-color 0.2s;
        }

        .main-nav .nav-link:hover {
            color: var(--color-primary);
            border-bottom-color: var(--color-primary);
        }

        .main-nav .nav-link.active {
            color: var(--color-primary);
            border-bottom-color: var(--color-primary);
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--color-ink);
            padding: 4px 8px;
            border-radius: 6px;
        }

        /* ========== Hero ========== */
        .hero {
            background: var(--color-primary-light);
            padding: 72px 0 80px;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: "";
            position: absolute;
            width: 520px;
            height: 520px;
            border-radius: 50%;
            background: rgba(44, 111, 212, 0.05);
            top: -180px;
            right: -120px;
            pointer-events: none;
        }

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

        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 22px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            font-size: 13px;
            font-weight: 500;
            color: var(--color-primary);
            background: var(--color-surface);
            padding: 5px 16px;
            border-radius: 24px;
            letter-spacing: 0.3px;
            box-shadow: 0 2px 8px rgba(18, 46, 74, 0.04);
        }

        .badge i {
            margin-right: 6px;
            font-size: 12px;
        }

        .hero h1 {
            font-size: clamp(32px, 4.5vw, 50px);
            font-weight: 700;
            line-height: 1.2;
            color: var(--color-ink);
            margin-bottom: 20px;
            letter-spacing: -0.3px;
        }

        .hero-sub {
            font-size: 18px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin-bottom: 30px;
            max-width: 520px;
        }

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

        .hero-image-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 12px 40px rgba(18, 46, 74, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.6);
        }

        .hero-image-wrap img {
            width: 100%;
            height: 420px;
            object-fit: cover;
        }

        .hero-trust {
            margin-top: 40px;
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            padding-top: 24px;
            border-top: 1px solid rgba(44, 111, 212, 0.10);
        }

        .trust-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--color-text-secondary);
        }

        .trust-item i {
            color: var(--color-primary);
            font-size: 16px;
        }

        /* ========== 三步上手 ========== */
        .steps-section {
            background: var(--color-bg);
        }

        .step-card {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            padding: 36px 32px;
            box-shadow: var(--shadow-sm);
            height: 100%;
            transition: box-shadow 0.3s, transform 0.3s;
            border-top: 3px solid transparent;
            position: relative;
        }

        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .step-card .step-num {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .step-num.step-1 {
            background: var(--color-primary-light);
            color: var(--color-primary);
        }

        .step-num.step-2 {
            background: #FDF4E3;
            color: #A97A22;
        }

        .step-num.step-3 {
            background: var(--color-ink);
            color: #fff;
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: 12px;
        }

        .step-card p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-secondary);
        }

        .step-line {
            border-left: 2px dashed var(--color-border);
            height: 60px;
            margin: 20px 0 20px 28px;
        }

        /* ========== 案例证明 ========== */
        .cases-section {
            background: var(--color-surface);
        }

        .case-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            display: flex;
            overflow: hidden;
            height: 100%;
            transition: box-shadow 0.3s, transform 0.3s;
        }

        .case-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .case-media {
            width: 40%;
            min-height: 260px;
            background-size: cover;
            background-position: center;
            flex-shrink: 0;
            position: relative;
        }

        .case-media::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, transparent 60%, rgba(255,255,255,0.85));
        }

        .case-body {
            padding: 32px 32px 28px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            flex: 1;
        }

        .case-tag {
            display: inline-flex;
            align-self: flex-start;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 12px;
            font-weight: 500;
            padding: 3px 14px;
            border-radius: 24px;
            margin-bottom: 14px;
        }

        .case-body h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: 10px;
        }

        .case-body p.desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-secondary);
            margin-bottom: 18px;
        }

        .case-stats {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .stat-item .stat-num {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-primary);
            font-variant-numeric: tabular-nums;
            line-height: 1.2;
        }

        .stat-item .stat-label {
            font-size: 12px;
            color: var(--color-muted);
            display: block;
            margin-top: 2px;
        }

        .case-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary);
            margin-top: 18px;
        }

        .case-link i {
            font-size: 12px;
            transition: transform 0.2s;
        }

        .case-link:hover i {
            transform: translateX(3px);
        }

        /* ========== 数据统计带 ========== */
        .stats-band {
            background: var(--color-ink);
            padding: 64px 0;
            color: #fff;
        }

        .stats-band .stat-box {
            text-align: center;
            padding: 20px;
        }

        .stats-band .stat-box .num {
            font-size: 36px;
            font-weight: 700;
            font-variant-numeric: tabular-nums;
            color: var(--color-accent);
            line-height: 1.2;
        }

        .stats-band .stat-box .label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            margin-top: 8px;
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: var(--color-bg);
        }

        .faq-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 0;
            margin-bottom: 16px;
            overflow: hidden;
            transition: box-shadow 0.3s;
        }

        .faq-card:hover {
            box-shadow: var(--shadow-sm);
        }

        .faq-card .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            background: var(--color-surface);
            border: none;
            width: 100%;
            text-align: left;
            gap: 16px;
        }

        .faq-card .faq-q .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: var(--color-muted);
            transition: all 0.3s;
            flex-shrink: 0;
        }

        .faq-card.active .faq-q .faq-icon {
            background: var(--color-primary);
            border-color: var(--color-primary);
            color: #fff;
            transform: rotate(45deg);
        }

        .faq-card .faq-a {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 14px;
            line-height: 1.8;
            color: var(--color-text-secondary);
            border-top: 0 solid var(--color-border);
        }

        .faq-card.active .faq-a {
            max-height: 400px;
            padding: 0 24px 20px;
            border-top-width: 1px;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: var(--color-bg);
            padding-top: 0;
        }

        .cta-card {
            background: var(--color-ink);
            border-radius: 20px;
            padding: 56px 64px;
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            flex-wrap: wrap;
        }

        .cta-text h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 600;
            color: #fff;
            margin-bottom: 8px;
        }

        .cta-text p {
            color: rgba(255, 255, 255, 0.65);
            font-size: 15px;
        }

        .cta-form {
            display: flex;
            gap: 12px;
            align-items: center;
            flex-wrap: wrap;
        }

        .cta-form input {
            height: 48px;
            border-radius: var(--radius-sm);
            border: none;
            padding: 0 18px;
            width: 280px;
            font-size: 15px;
            outline: none;
            transition: box-shadow 0.2s;
            background: #fff;
        }

        .cta-form input:focus {
            box-shadow: 0 0 0 4px rgba(44, 111, 212, 0.25);
        }

        /* ========== 最新资讯 CMS ========== */
        .news-section {
            background: var(--color-bg);
            padding-top: 0;
        }

        .news-wrap {
            max-width: 960px;
            margin: 0 auto;
        }

        .news-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
        }

        .news-head h2 {
            font-size: 24px;
            font-weight: 600;
            color: var(--color-ink);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .news-head .new-badge {
            background: var(--color-primary);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: 24px;
            letter-spacing: 0.5px;
        }

        .news-list .info-row {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--color-surface);
            border-radius: 10px;
            box-shadow: var(--shadow-sm);
            padding: 0 24px;
            min-height: 72px;
            margin-bottom: 12px;
            border-left: 4px solid transparent;
            transition: box-shadow 0.3s, background 0.3s, border-color 0.3s;
        }

        .news-list .info-row:hover {
            background: var(--color-primary-light);
            border-left-color: var(--color-primary);
            box-shadow: var(--shadow-md);
        }

        .info-tag {
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 12px;
            font-weight: 500;
            padding: 3px 14px;
            border-radius: 24px;
            white-space: nowrap;
        }

        .info-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            flex: 1;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .info-excerpt {
            font-size: 14px;
            color: var(--color-text-secondary);
            flex: 1.4;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .info-date {
            font-size: 13px;
            color: var(--color-muted);
            white-space: nowrap;
            font-variant-numeric: tabular-nums;
        }

        .info-read {
            font-size: 14px;
            color: var(--color-primary);
            font-weight: 500;
            white-space: nowrap;
        }

        .empty-state {
            background: var(--color-primary-light);
            border-radius: var(--radius-md);
            padding: 48px 24px;
            text-align: center;
            color: var(--color-text-secondary);
            font-size: 15px;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--color-ink);
            color: #fff;
            padding: 64px 0 32px;
            margin-top: 0;
        }

        .site-footer::before {
            content: "";
            display: block;
            height: 3px;
            background: var(--color-accent);
            width: 100%;
            position: absolute;
            left: 0;
        }

        .site-footer {
            position: relative;
        }

        .footer-top {
            display: flex;
            justify-content: space-between;
            gap: 48px;
            flex-wrap: wrap;
            margin-bottom: 48px;
        }

        .footer-brand {
            max-width: 320px;
        }

        .footer-brand .brand-name {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-brand .brand-name i {
            color: var(--color-accent);
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
        }

        .footer-links {
            display: flex;
            gap: 40px;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            padding: 4px 0;
            transition: color 0.2s;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }

        /* ========== 移动端底部 Tab ========== */
        .bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: var(--tab-height);
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            z-index: 200;
            padding-bottom: env(safe-area-inset-bottom);
            box-shadow: 0 -2px 12px rgba(18, 46, 74, 0.06);
        }

        .bottom-tab .tab-inner {
            display: flex;
            height: 100%;
            align-items: center;
            justify-content: space-around;
            max-width: 480px;
            margin: 0 auto;
            padding: 0 12px;
        }

        .bottom-tab .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            font-size: 12px;
            color: var(--color-muted);
            padding: 6px 12px;
            border-radius: 12px;
            transition: color 0.2s, transform 0.2s;
            flex: 1;
            max-width: 96px;
        }

        .bottom-tab .tab-item svg {
            width: 22px;
            height: 22px;
        }

        .bottom-tab .tab-item.active {
            color: var(--color-primary);
            font-weight: 500;
        }

        .bottom-tab .tab-item:active {
            transform: scale(0.96);
        }

        /* ========== 响应式 ========== */
        @media screen and (max-width: 1024px) {
            .case-card {
                flex-direction: column;
            }
            .case-media {
                width: 100%;
                height: 180px;
                min-height: 0;
            }
            .case-media::after {
                background: linear-gradient(180deg, transparent 60%, rgba(255,255,255,0.6));
            }
            .cta-card {
                padding: 40px 32px;
            }
            .footer-top {
                gap: 32px;
            }
        }

        @media screen and (max-width: 639px) {
            .section {
                padding: 56px 0;
            }
            .container {
                padding: 0 20px;
            }
            body {
                padding-bottom: calc(var(--tab-height) + 16px);
            }

            .site-header {
                height: 56px;
            }
            .main-nav {
                display: none;
            }
            .menu-toggle {
                display: block;
            }
            .brand {
                font-size: 17px;
            }
            .brand .brand-icon {
                width: 28px;
                height: 28px;
                font-size: 13px;
            }

            .hero {
                padding: 40px 0 48px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-sub {
                font-size: 15px;
            }
            .hero-image-wrap img {
                height: 200px;
            }
            .hero-cta {
                flex-direction: column;
            }
            .hero-cta .btn {
                width: 100%;
            }

            .step-card {
                padding: 24px 20px;
                margin-bottom: 16px;
            }
            .section-head {
                margin-bottom: 36px;
            }

            .case-body {
                padding: 24px 20px;
            }
            .case-stats {
                gap: 16px;
            }

            .stats-band {
                padding: 40px 0;
            }
            .stats-band .stat-box .num {
                font-size: 28px;
            }

            .faq-card .faq-q {
                padding: 16px 20px;
                font-size: 15px;
            }
            .faq-card .faq-a {
                padding: 0 20px;
            }
            .faq-card.active .faq-a {
                padding: 0 20px 16px;
            }

            .cta-section {
                padding-top: 0;
            }
            .cta-card {
                padding: 32px 24px;
                flex-direction: column;
                align-items: stretch;
            }
            .cta-form {
                flex-direction: column;
                width: 100%;
            }
            .cta-form input {
                width: 100%;
            }
            .cta-form .btn {
                width: 100%;
            }

            .news-wrap {
                padding: 0;
            }
            .news-list .info-row {
                flex-wrap: wrap;
                padding: 16px 16px;
                min-height: auto;
                gap: 10px;
            }
            .info-excerpt {
                flex-basis: 100%;
                white-space: normal;
                display: -webkit-box;
                -webkit-line-clamp: 2;
                -webkit-box-orient: vertical;
                overflow: hidden;
            }
            .info-date {
                font-size: 12px;
            }
            .info-title {
                font-size: 15px;
            }

            .footer-top {
                flex-direction: column;
                gap: 32px;
            }
            .footer-links {
                flex-wrap: wrap;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .bottom-tab {
                display: block;
            }
        }

        @media screen and (min-width: 640px) {
            .bottom-tab {
                display: none !important;
            }
        }

        /* ========== 滚动条 ========== */
        ::selection {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
        }

        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--color-bg);
        }

        ::-webkit-scrollbar-thumb {
            background: #C5D3E2;
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--color-primary);
        }

        /* ========== Foundation 覆盖 ========== */
        .accordion-title {
            font-size: 16px !important;
        }

        .accordion-title:hover {
            background: var(--color-primary-light) !important;
        }

        .accordion-item.is-active>.accordion-title {
            background: var(--color-primary-light) !important;
            color: var(--color-primary-dark) !important;
        }

/* roulang page: article */
/* ============ 设计变量 ============ */
        :root {
            --color-primary: #2C6FD4;
            --color-primary-light: #EAF1F9;
            --color-primary-dark: #1C4373;
            --color-accent: #D9A441;
            --color-ink: #133A5B;
            --color-bg: #F5F8FB;
            --color-surface: #FFFFFF;
            --color-text: #2C3E50;
            --color-text-secondary: #5A6E82;
            --color-muted: #8A9BAB;
            --color-border: #E6EDF5;

            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;

            --shadow-1: 0 4px 20px rgba(18, 46, 74, 0.05);
            --shadow-2: 0 8px 30px rgba(18, 46, 74, 0.10);

            --container: 1200px;
            --header-h: 68px;
        }

        /* ============ 基础重置 ============ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            font-size: 16px;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
            padding-bottom: 80px;
        }

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

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

        a:hover {
            color: var(--color-primary-dark);
        }

        button,
        input {
            font-family: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ::selection {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
        }

        h1,
        h2,
        h3,
        h4 {
            line-height: 1.3;
            color: var(--color-text);
        }

        /* ============ 通用容器 ============ */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        .container-narrow {
            max-width: 960px;
        }

        /* ============ 按钮 ============ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 46px;
            padding: 0 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            line-height: 1;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

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

        .btn-primary:hover {
            background: var(--color-primary-dark);
            box-shadow: 0 6px 20px rgba(44, 111, 212, 0.3);
            color: #fff;
        }

        .btn-outline {
            background: transparent;
            border: 1px solid var(--color-primary);
            color: var(--color-primary);
        }

        .btn-outline:hover {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
        }

        .btn-accent {
            background: var(--color-accent);
            color: var(--color-ink);
        }

        .btn-accent:hover {
            filter: brightness(1.05);
            color: var(--color-ink);
            box-shadow: 0 6px 20px rgba(217, 164, 65, 0.35);
        }

        .btn-sm {
            height: 40px;
            padding: 0 20px;
            font-size: 14px;
        }

        .btn:active {
            transform: translateY(1px);
        }

        /* ============ 顶部导航 ============ */
        .site-header {
            background: var(--color-surface);
            height: var(--header-h);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--color-border);
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: var(--header-h);
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary-dark);
        }

        .brand:hover {
            color: var(--color-primary-dark);
        }

        .brand-icon {
            width: 34px;
            height: 34px;
            border-radius: 10px;
            background: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-primary);
            font-size: 16px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text-secondary);
            padding: 6px 2px;
            transition: color 0.2s;
        }

        .nav-link:hover {
            color: var(--color-primary);
        }

        .nav-link.active {
            color: var(--color-primary);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            border-radius: 2px;
            background: var(--color-primary);
        }

        .mobile-menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
            font-size: 18px;
            transition: background 0.2s;
        }

        .mobile-menu-toggle:hover {
            background: #dce7f3;
        }

        /* 移动端导航抽屉 */
        .mobile-nav-drawer {
            display: none;
            position: fixed;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--color-border);
            box-shadow: 0 12px 30px rgba(18, 46, 74, 0.1);
            z-index: 99;
            padding: 16px 0;
        }

        .mobile-nav-drawer.open {
            display: block;
        }

        .mobile-nav-drawer a {
            display: block;
            padding: 12px 24px;
            font-size: 15px;
            color: var(--color-text);
            border-left: 3px solid transparent;
        }

        .mobile-nav-drawer a.active {
            border-left-color: var(--color-primary);
            color: var(--color-primary);
            background: var(--color-primary-light);
            font-weight: 600;
        }

        .mobile-nav-drawer .btn {
            margin: 12px 24px 8px;
            width: calc(100% - 48px);
        }

        /* ============ 底部 Tab（移动端） ============ */
        .bottom-tabbar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 56px;
            background: #fff;
            border-top: 1px solid var(--color-border);
            z-index: 200;
            padding-bottom: env(safe-area-inset-bottom);
            align-items: center;
            justify-content: space-around;
        }

        .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            font-size: 12px;
            color: var(--color-muted);
            padding: 4px 12px;
            border-radius: var(--radius-sm);
            transition: transform 0.15s ease;
        }

        .tab-item i {
            font-size: 18px;
        }

        .tab-item.active {
            color: var(--color-primary);
        }

        .tab-item:active {
            transform: scale(0.96);
        }

        /* ============ 文章 Hero ============ */
        .article-hero {
            position: relative;
            padding: 88px 0 72px;
            background:
                linear-gradient(180deg, rgba(19, 58, 91, 0.86) 0%, rgba(19, 58, 91, 0.62) 100%),
                url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            color: #fff;
            overflow: hidden;
        }

        .article-hero::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 100px;
            background: linear-gradient(180deg, transparent, var(--color-bg));
            pointer-events: none;
        }

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

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 32px;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
            transition: color 0.2s;
        }

        .breadcrumb a:hover {
            color: var(--color-accent);
        }

        .breadcrumb .sep {
            opacity: 0.5;
        }

        .breadcrumb .current {
            color: var(--color-accent);
            max-width: 320px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .article-hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 18px;
        }

        .article-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.16);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            font-size: 13px;
            padding: 4px 16px;
            border-radius: 24px;
            backdrop-filter: blur(4px);
        }

        .article-hero-title {
            font-size: clamp(30px, 4.2vw, 44px);
            font-weight: 700;
            line-height: 1.25;
            color: #fff;
            max-width: 900px;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
        }

        .article-hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.8);
        }

        .article-hero-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-hero-meta .meta-item i {
            color: var(--color-accent);
        }

        /* ============ 正文区域 ============ */
        .article-body-section {
            position: relative;
            z-index: 3;
            padding: 40px 0 72px;
        }

        .article-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-1);
            padding: 56px 64px;
            border: 1px solid var(--color-border);
        }

        .article-content {
            font-size: 17px;
            line-height: 1.9;
            color: var(--color-text);
        }

        .article-content h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--color-text);
            margin: 44px 0 18px;
            padding-left: 16px;
            border-left: 4px solid var(--color-primary);
        }

        .article-content h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--color-primary-dark);
            margin: 30px 0 14px;
        }

        .article-content p {
            margin-bottom: 20px;
        }

        .article-content a {
            color: var(--color-primary);
            border-bottom: 1px solid rgba(44, 111, 212, 0.35);
        }

        .article-content a:hover {
            color: var(--color-primary-dark);
            border-bottom-color: var(--color-primary-dark);
        }

        .article-content blockquote {
            background: var(--color-primary-light);
            border-left: 4px solid var(--color-primary);
            border-radius: 8px;
            padding: 20px 26px;
            margin: 28px 0;
            color: var(--color-text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 20px 0;
            padding-left: 0;
            list-style: none;
        }

        .article-content ul li {
            position: relative;
            padding-left: 22px;
            margin-bottom: 10px;
        }

        .article-content ul li::before {
            content: "";
            position: absolute;
            left: 4px;
            top: 0.85em;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--color-primary);
        }

        .article-content ol {
            counter-reset: ol-item;
        }

        .article-content ol li {
            counter-increment: ol-item;
            position: relative;
            padding-left: 36px;
            margin-bottom: 10px;
        }

        .article-content ol li::before {
            content: counter(ol-item);
            position: absolute;
            left: 0;
            top: 0.2em;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 13px;
            font-weight: 600;
            display: flex;
            align-items: center;
            justify-content: center;
            line-height: 1;
        }

        .article-content img {
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-1);
            margin: 32px auto;
            max-width: 100%;
            height: auto;
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 28px 0;
            font-size: 15px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            box-shadow: var(--shadow-1);
        }

        .article-content table th,
        .article-content table td {
            padding: 14px 18px;
            border: 1px solid var(--color-border);
            text-align: left;
        }

        .article-content table th {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
            font-weight: 600;
        }

        .article-content code {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
            border-radius: 4px;
            padding: 2px 8px;
            font-size: 14px;
        }

        .article-content pre {
            background: var(--color-ink);
            color: #fff;
            border-radius: var(--radius-md);
            padding: 24px;
            overflow-x: auto;
            margin: 28px 0;
            font-family: "SFMono-Regular", Consolas, monospace;
            font-size: 14px;
            line-height: 1.7;
        }

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

        /* ============ 文章底部信息 ============ */
        .article-bottom {
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid var(--color-border);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .article-source {
            font-size: 14px;
            color: var(--color-muted);
        }

        .article-source span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-right: 18px;
        }

        .share-row {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .share-label {
            font-size: 14px;
            color: var(--color-text-secondary);
            margin-right: 4px;
        }

        .share-btn {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--color-primary-light);
            color: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            transition: all 0.2s;
        }

        .share-btn:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ============ 未找到文章 ============ */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
        }

        .not-found-icon {
            width: 84px;
            height: 84px;
            margin: 0 auto 24px;
            border-radius: 50%;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 34px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .not-found-box h2 {
            font-size: 28px;
            color: var(--color-text);
            margin-bottom: 12px;
        }

        .not-found-box p {
            color: var(--color-text-secondary);
            margin-bottom: 28px;
            font-size: 15px;
        }

        /* ============ 相关推荐 ============ */
        .related-section {
            padding: 72px 0;
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
        }

        .section-head {
            margin-bottom: 40px;
        }

        .section-eyebrow {
            display: inline-block;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 1px;
            padding: 4px 16px;
            border-radius: 24px;
            margin-bottom: 12px;
        }

        .section-head h2 {
            font-size: clamp(24px, 3vw, 36px);
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 8px;
        }

        .section-head p {
            color: var(--color-text-secondary);
            font-size: 15px;
        }

        .related-grid {
            margin: 0 -12px;
        }

        .related-grid .columns {
            padding: 0 12px;
            margin-bottom: 24px;
        }

        .related-card {
            display: flex;
            background: var(--color-bg);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            height: 100%;
            transition: box-shadow 0.25s ease, transform 0.25s ease;
        }

        .related-card:hover {
            box-shadow: var(--shadow-2);
            transform: translateY(-2px);
        }

        .related-card .rc-image {
            width: 40%;
            flex-shrink: 0;
            overflow: hidden;
        }

        .related-card .rc-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 180px;
        }

        .related-card .rc-body {
            padding: 20px 22px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .related-card .badge {
            display: inline-block;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 12px;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 24px;
            margin-bottom: 8px;
            align-self: flex-start;
        }

        .related-card h3 {
            font-size: 17px;
            font-weight: 600;
            line-height: 1.5;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .related-card p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.6;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .read-more {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap 0.2s;
        }

        .related-card .read-more:hover {
            gap: 10px;
        }

        /* ============ CTA 大卡 ============ */
        .cta-section {
            padding: 72px 0 88px;
        }

        .cta-card {
            background: var(--color-ink);
            border-radius: 20px;
            padding: 56px 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            flex-wrap: wrap;
            color: #fff;
        }

        .cta-copy {
            flex: 1 1 320px;
        }

        .cta-copy .cta-label {
            display: inline-block;
            background: rgba(255, 255, 255, 0.12);
            color: var(--color-accent);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 1px;
            padding: 4px 14px;
            border-radius: 24px;
            margin-bottom: 14px;
        }

        .cta-copy h2 {
            font-size: clamp(22px, 2.6vw, 32px);
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }

        .cta-copy p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
        }

        .cta-form {
            flex: 0 1 460px;
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .cta-form input {
            flex: 1 1 240px;
            height: 48px;
            border: none;
            border-radius: var(--radius-sm);
            padding: 0 18px;
            font-size: 14px;
            background: #fff;
            outline: none;
            transition: box-shadow 0.2s;
        }

        .cta-form input:focus {
            box-shadow: 0 0 0 3px rgba(44, 111, 212, 0.35);
        }

        .cta-form .btn {
            height: 48px;
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: var(--color-ink);
            color: #fff;
            padding: 64px 0 32px;
            border-top: 3px solid var(--color-accent);
        }

        .footer-top {
            display: flex;
            justify-content: space-between;
            gap: 48px;
            flex-wrap: wrap;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            margin-bottom: 24px;
        }

        .footer-brand {
            max-width: 340px;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }

        .brand-name i {
            color: var(--color-accent);
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
        }

        .footer-links {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 2.2;
            transition: color 0.2s;
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }

        /* ============ 阅读进度条 ============ */
        .reading-progress {
            position: fixed;
            top: 0;
            left: 0;
            height: 3px;
            width: 0;
            background: var(--color-primary);
            z-index: 999;
            border-radius: 0 3px 3px 0;
            transition: width 0.1s linear;
        }

        /* ============ 响应式 ============ */
        @media (max-width: 1023px) {
            .related-card {
                flex-direction: column;
            }

            .related-card .rc-image {
                width: 100%;
            }

            .related-card .rc-image img {
                min-height: 150px;
            }

            .cta-card {
                padding: 40px 32px;
                flex-direction: column;
                align-items: flex-start;
            }

            .cta-form {
                width: 100%;
            }
        }

        @media (max-width: 767px) {
            .article-card {
                padding: 32px 28px;
            }

            .article-body-section {
                padding: 24px 0 48px;
            }

            .article-hero {
                padding: 56px 0 64px;
            }

            .article-hero-title {
                font-size: 28px;
            }

            .article-hero-meta {
                gap: 12px;
                font-size: 13px;
                flex-direction: column;
            }

            .breadcrumb {
                font-size: 12px;
            }

            .related-section {
                padding: 56px 0;
            }

            .cta-section {
                padding: 48px 0 64px;
            }

            .footer-top {
                flex-direction: column;
                gap: 32px;
            }

            .footer-links {
                gap: 32px;
                justify-content: space-between;
                width: 100%;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }

            .article-content {
                font-size: 16px;
            }

            .article-content h2 {
                font-size: 22px;
            }
        }

        @media (min-width: 640px) {
            .bottom-tabbar {
                display: none;
            }

            body {
                padding-bottom: 0;
            }
        }

        @media (max-width: 639px) {
            .site-header {
                height: 60px;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
            }

            body {
                padding-top: 60px;
                padding-bottom: 72px;
            }

            .header-inner {
                height: 60px;
            }

            .main-nav {
                display: none;
            }

            .mobile-menu-toggle {
                display: flex;
            }

            .bottom-tabbar {
                display: flex;
            }

            .brand {
                font-size: 17px;
            }

            .brand-icon {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }

            .container {
                padding: 0 16px;
            }

            .article-hero {
                padding: 40px 0 48px;
            }

            .article-hero-title {
                font-size: 24px;
                line-height: 1.35;
            }

            .article-card {
                padding: 24px 20px;
            }

            .cta-card {
                padding: 32px 24px;
                border-radius: 16px;
            }

            .cta-form {
                flex-direction: column;
            }

            .cta-form input,
            .cta-form .btn {
                width: 100%;
                flex: none;
            }

            .related-card .rc-image img {
                min-height: 140px;
            }

            .article-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (min-width: 1024px) {
            .related-grid .columns:nth-last-child(-n + 2) {
                margin-bottom: 0;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #2C6FD4;
            --color-primary-light: #EAF1F9;
            --color-primary-dark: #1C4373;
            --color-accent: #D9A441;
            --color-ink: #133A5B;
            --color-bg: #F5F8FB;
            --color-surface: #FFFFFF;
            --color-text: #2C3E50;
            --color-text-secondary: #5A6E82;
            --color-muted: #8A9BAB;
            --color-border: #E6EDF5;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 4px 20px rgba(18, 46, 74, 0.05);
            --shadow-md: 0 8px 30px rgba(18, 46, 74, 0.10);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.8;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 0.2s;
        }

        a:hover {
            color: var(--color-primary-dark);
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 46px;
            padding: 0 26px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            border: 1px solid transparent;
            transition: all 0.25s;
            line-height: 1;
        }

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

        .btn-primary:hover {
            background: var(--color-primary-dark);
            color: #fff;
            box-shadow: 0 6px 18px rgba(44, 111, 212, 0.22);
        }

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

        .btn-outline:hover {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
        }

        .btn-sm {
            height: 40px;
            padding: 0 18px;
            font-size: 14px;
        }

        .btn-muted {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
            border-color: transparent;
            pointer-events: none;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #fff;
            border-bottom: 1px solid var(--color-border);
            height: 68px;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            position: relative;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary-dark);
            line-height: 1.2;
            white-space: nowrap;
        }

        .brand i {
            color: var(--color-primary);
            font-size: 18px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-link {
            font-size: 15px;
            color: var(--color-text);
            padding: 6px 0;
            position: relative;
            font-weight: 500;
            border-bottom: none;
        }

        .nav-link:hover {
            color: var(--color-primary);
        }

        .nav-link.active {
            color: var(--color-primary);
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
        }

        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            background: #fff;
            color: var(--color-text);
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }

        .mobile-tabbar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 56px;
            background: #fff;
            border-top: 1px solid var(--color-border);
            z-index: 200;
            align-items: center;
            justify-content: space-around;
            padding-bottom: env(safe-area-inset-bottom);
        }

        .mobile-tabbar .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            color: var(--color-muted);
            font-size: 12px;
            flex: 1;
            height: 100%;
            transition: transform 0.2s;
        }

        .mobile-tabbar .tab-item i {
            font-size: 18px;
        }

        .mobile-tabbar .tab-item.active {
            color: var(--color-primary);
        }

        .mobile-tabbar .tab-item:active {
            transform: scale(0.96);
        }

        .page-hero {
            position: relative;
            padding: 84px 0 80px;
            background: var(--color-primary-light);
            overflow: hidden;
        }

        .page-hero::before {
            content: "";
            position: absolute;
            width: 520px;
            height: 520px;
            border-radius: 50%;
            background: rgba(44, 111, 212, 0.05);
            top: -180px;
            right: -140px;
        }

        .page-hero::after {
            content: "";
            position: absolute;
            width: 380px;
            height: 380px;
            border-radius: 50%;
            background: rgba(217, 164, 65, 0.06);
            bottom: -160px;
            left: 6%;
        }

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

        .breadcrumb {
            font-size: 13px;
            color: var(--color-muted);
            margin-bottom: 16px;
        }

        .breadcrumb a {
            color: var(--color-muted);
            border-bottom: none;
        }

        .breadcrumb a:hover {
            color: var(--color-primary);
        }

        .breadcrumb span {
            color: var(--color-primary);
            font-weight: 600;
        }

        .page-hero h1 {
            font-size: clamp(32px, 4.5vw, 50px);
            font-weight: 700;
            line-height: 1.15;
            color: #1D2B3A;
            margin: 0 0 18px;
            letter-spacing: -0.02em;
        }

        .hero-lead {
            font-size: 18px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            max-width: 520px;
            margin: 0 0 22px;
        }

        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 0 0 28px;
        }

        .hero-badge {
            background: #fff;
            color: var(--color-primary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 24px;
            box-shadow: 0 2px 8px rgba(18, 46, 74, 0.04);
        }

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

        .hero-image {
            border-radius: var(--radius-lg);
            box-shadow: 0 12px 40px rgba(18, 46, 74, 0.12);
            border: 1px solid #fff;
            width: 100%;
            height: 340px;
            object-fit: cover;
        }

        .section {
            padding: 96px 0;
        }

        .section-white {
            background: var(--color-surface);
        }

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

        .section-head {
            max-width: 720px;
            margin: 0 auto 52px;
            text-align: center;
        }

        .section-tag {
            display: inline-block;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 18px;
            border-radius: 24px;
            margin-bottom: 14px;
        }

        .section-head h2 {
            font-size: clamp(24px, 3vw, 36px);
            font-weight: 600;
            line-height: 1.3;
            color: #1D2B3A;
            margin: 0 0 16px;
        }

        .section-head h2::after {
            content: "";
            display: block;
            width: 36px;
            height: 4px;
            background: var(--color-primary);
            border-radius: 4px;
            margin: 12px auto 0;
        }

        .section-head p {
            font-size: 16px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        .section-head.light h2 {
            color: #fff;
        }

        .section-head.light h2::after {
            background: var(--color-accent);
        }

        .section-head.light p {
            color: rgba(255, 255, 255, 0.7);
        }

        .step-card {
            background: #fff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 32px 28px;
            height: 100%;
            position: relative;
            overflow: hidden;
            transition: box-shadow 0.25s, transform 0.25s;
        }

        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .step-card::before {
            content: "";
            position: absolute;
            left: 0;
            top: 24px;
            bottom: 24px;
            width: 4px;
            border-radius: 4px;
            background: var(--color-primary-light);
        }

        .step-1::before {
            background: var(--color-primary);
        }

        .step-2::before {
            background: var(--color-accent);
        }

        .step-3::before {
            background: var(--color-primary-dark);
        }

        .step-4::before {
            background: var(--color-ink);
        }

        .step-num {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            background: var(--color-primary-light);
            color: var(--color-primary);
            margin-bottom: 20px;
            font-variant-numeric: tabular-nums;
        }

        .step-2 .step-num {
            background: rgba(217, 164, 65, 0.16);
            color: #8a6520;
        }

        .step-3 .step-num {
            background: var(--color-primary-dark);
            color: #fff;
        }

        .step-4 .step-num {
            background: var(--color-ink);
            color: #fff;
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: #1D2B3A;
            margin: 0 0 10px;
        }

        .step-card p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        .scene-card {
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            height: 100%;
            transition: box-shadow 0.25s, transform 0.25s;
        }

        .scene-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .scene-card img {
            width: 100%;
            height: 210px;
            object-fit: cover;
        }

        .scene-body {
            padding: 28px;
        }

        .scene-tag {
            display: inline-block;
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 24px;
        }

        .scene-tag.accent {
            background: rgba(217, 164, 65, 0.16);
            color: #8a6520;
        }

        .scene-body h3 {
            font-size: 20px;
            font-weight: 600;
            color: #1D2B3A;
            margin: 14px 0 12px;
        }

        .scene-body p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.8;
            margin: 0;
        }

        .section-ink {
            background: var(--color-ink);
            position: relative;
            overflow: hidden;
        }

        .section-ink::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
        }

        .section-ink .container {
            position: relative;
            z-index: 1;
        }

        .method-item {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            gap: 18px;
            align-items: flex-start;
            height: 100%;
            transition: background 0.25s;
        }

        .method-item:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .method-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }

        .method-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 8px;
        }

        .method-body p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
            margin: 0;
        }

        .stats-wrap {
            display: flex;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            background: #fff;
            box-shadow: var(--shadow-sm);
            overflow: hidden;
        }

        .stat-item {
            flex: 1;
            text-align: center;
            padding: 36px 20px;
            border-right: 1px solid var(--color-border);
        }

        .stat-item:last-child {
            border-right: none;
        }

        .stat-number {
            font-size: 34px;
            font-weight: 700;
            color: var(--color-primary);
            font-variant-numeric: tabular-nums;
            line-height: 1.2;
        }

        .stat-label {
            font-size: 14px;
            color: var(--color-text-secondary);
            margin-top: 8px;
        }

        .faq-list .accordion-item {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
            transition: box-shadow 0.2s;
        }

        .faq-list .accordion-item:hover {
            box-shadow: var(--shadow-sm);
        }

        .faq-list .accordion-title {
            background: #fff;
            border: none;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-text);
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-radius: var(--radius-md);
            outline: none;
            transition: color 0.2s;
            line-height: 1.4;
        }

        .faq-list .accordion-title:hover {
            color: var(--color-primary);
        }

        .faq-list .accordion-title::before,
        .faq-list .accordion-title::after {
            display: none;
        }

        .faq-icon {
            color: var(--color-muted);
            transition: transform 0.25s, color 0.25s;
            font-size: 16px;
            flex-shrink: 0;
            margin-left: 12px;
        }

        .accordion-item.is-active .faq-icon {
            transform: rotate(45deg);
            color: var(--color-primary);
        }

        .faq-list .accordion-content {
            padding: 0;
            background: #fff;
            border: none;
        }

        .faq-content {
            padding: 16px 24px 20px;
            color: var(--color-text-secondary);
            font-size: 14px;
            line-height: 1.8;
            border-top: 1px solid var(--color-border);
            margin: 0 24px;
        }

        .related-box {
            background: var(--color-primary-light);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
        }

        .related-box h2 {
            font-size: 26px;
            font-weight: 600;
            color: #1D2B3A;
            margin: 0 0 12px;
        }

        .related-box p {
            color: var(--color-text-secondary);
            max-width: 640px;
            margin: 0 auto 28px;
            font-size: 15px;
        }

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

        .site-footer {
            background: var(--color-ink);
            color: #fff;
            padding: 64px 0 0;
            border-top: 2px solid var(--color-primary);
        }

        .footer-top {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 48px;
            padding-bottom: 44px;
        }

        .footer-brand .brand-name {
            font-size: 20px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-brand .brand-name i {
            color: var(--color-accent);
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.8;
            margin: 0;
        }

        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .footer-col h4 {
            font-size: 15px;
            color: #fff;
            margin: 0 0 14px;
            font-weight: 600;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 2.4;
            border-bottom: none;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            gap: 16px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
        }

        .site-header.nav-open .main-nav {
            display: flex;
            position: absolute;
            left: 0;
            right: 0;
            top: 68px;
            background: #fff;
            border-bottom: 1px solid var(--color-border);
            flex-direction: column;
            align-items: flex-start;
            padding: 16px 24px;
            gap: 14px;
            box-shadow: 0 12px 30px rgba(18, 46, 74, 0.08);
        }

        .site-header.nav-open .main-nav .nav-link {
            width: 100%;
            padding: 8px 0;
        }

        .site-header.nav-open .main-nav .btn {
            margin-top: 8px;
        }

        @media screen and (max-width: 1023.98px) {
            .section {
                padding: 76px 0;
            }

            .hero-image {
                margin-top: 40px;
                height: 300px;
            }
        }

        @media screen and (max-width: 639.98px) {
            body {
                padding-bottom: 72px;
            }

            .site-header {
                height: 60px;
            }

            .header-inner {
                height: 60px;
            }

            .brand {
                font-size: 16px;
            }

            .main-nav {
                display: none;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .mobile-tabbar {
                display: flex;
            }

            .page-hero {
                padding: 48px 0;
            }

            .page-hero h1 {
                font-size: 28px;
            }

            .hero-lead {
                font-size: 16px;
            }

            .hero-image {
                height: 220px;
                margin-top: 32px;
            }

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

            .section {
                padding: 56px 0;
            }

            .section-head {
                margin-bottom: 36px;
            }

            .step-card {
                margin-bottom: 20px;
            }

            .scene-card {
                margin-bottom: 24px;
            }

            .scene-card img {
                height: 180px;
            }

            .method-item {
                margin-bottom: 16px;
            }

            .stats-wrap {
                flex-direction: column;
            }

            .stat-item {
                border-right: none;
                border-bottom: 1px solid var(--color-border);
                padding: 28px 16px;
            }

            .stat-item:last-child {
                border-bottom: none;
            }

            .related-box {
                padding: 32px 20px;
            }

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

            .footer-top {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-links {
                grid-template-columns: 1fr 1fr;
            }

            .footer-bottom {
                flex-direction: column;
            }
        }

/* roulang page: category2 */
/* ============ 设计变量 ============ */
        :root {
            --color-primary: #2C6FD4;
            --color-primary-light: #EAF1F9;
            --color-primary-dark: #1C4373;
            --color-accent: #D9A441;
            --color-ink: #133A5B;
            --color-bg: #F5F8FB;
            --color-surface: #FFFFFF;
            --color-text: #2C3E50;
            --color-text-secondary: #5A6E82;
            --color-muted: #8A9BAB;
            --color-border: #E6EDF5;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-pill: 24px;
            --shadow-sm: 0 4px 20px rgba(18, 46, 74, 0.05);
            --shadow-md: 0 8px 30px rgba(18, 46, 74, 0.10);
            --shadow-primary: 0 6px 24px rgba(44, 111, 212, 0.22);
            --transition-base: 0.2s ease;
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
        }

        /* ============ Reset & Base ============ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.8;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-bottom: 0;
        }

        @media (max-width: 639.98px) {
            body {
                padding-bottom: 80px;
            }
        }

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

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        }

        a:hover {
            color: var(--color-primary-dark);
        }

        ul,
        ol {
            list-style: none;
        }

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

        input[type="text"],
        input[type="email"],
        input[type="tel"] {
            font-family: inherit;
            font-size: 15px;
        }

        ::selection {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
        }

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

        /* ============ 顶部导航 ============ */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: 68px;
            position: sticky;
            top: 0;
            z-index: 998;
            box-shadow: 0 2px 12px rgba(18, 46, 74, 0.04);
        }

        .nav-inner {
            height: 68px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .brand {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary-dark);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
            line-height: 1.2;
        }

        .brand i {
            width: 34px;
            height: 34px;
            background: var(--color-primary-light);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--color-primary);
            font-size: 15px;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            padding: 6px 2px;
            line-height: 1.4;
            transition: color 0.2s ease;
        }

        .nav-link:hover {
            color: var(--color-primary);
        }

        .nav-link.active {
            color: var(--color-primary);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 46px;
            padding: 0 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            line-height: 1;
            transition: all 0.25s ease;
            border: 1px solid transparent;
        }

        .btn-sm {
            height: 40px;
            padding: 0 22px;
            font-size: 14px;
            border-radius: 8px;
        }

        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(44, 111, 212, 0.24);
        }

        .btn-primary:hover {
            background: var(--color-primary-dark);
            color: #fff;
            box-shadow: 0 6px 20px rgba(44, 111, 212, 0.30);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 3px 10px rgba(44, 111, 212, 0.20);
        }

        .btn-secondary {
            background: var(--color-surface);
            color: var(--color-primary);
            border-color: var(--color-primary);
        }

        .btn-secondary:hover {
            background: var(--color-primary-light);
            color: var(--color-primary-dark);
            box-shadow: 0 4px 12px rgba(44, 111, 212, 0.12);
        }

        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: 8px;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 18px;
            align-items: center;
            justify-content: center;
            transition: background 0.2s ease, color 0.2s ease;
        }

        .nav-toggle:hover {
            background: var(--color-primary);
            color: #fff;
        }

        /* 移动端抽屉 */
        .mobile-menu {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            box-shadow: 0 12px 32px rgba(18, 46, 74, 0.12);
            z-index: 997;
            padding: 8px 0;
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu a {
            display: block;
            padding: 14px 24px;
            color: var(--color-text);
            font-size: 15px;
            font-weight: 500;
            border-bottom: 1px solid var(--color-border);
            transition: background 0.2s ease, color 0.2s ease;
        }

        .mobile-menu a:last-child {
            border-bottom: none;
        }

        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: var(--color-primary-light);
            color: var(--color-primary);
        }

        @media (max-width: 639.98px) {
            .main-nav {
                display: none;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .site-header {
                height: 64px;
            }
            .nav-inner {
                height: 64px;
            }
            .brand {
                font-size: 18px;
            }
        }

        /* ============ 底部 Tab（移动端） ============ */
        .bottom-tabbar {
            display: none;
        }

        @media (max-width: 639.98px) {
            .bottom-tabbar {
                display: flex;
                position: fixed;
                bottom: 0;
                left: 0;
                right: 0;
                height: 56px;
                background: var(--color-surface);
                border-top: 1px solid var(--color-border);
                z-index: 1000;
                padding-bottom: env(safe-area-inset-bottom);
            }

            .tab-item {
                flex: 1;
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                gap: 3px;
                color: var(--color-muted);
                font-size: 12px;
                line-height: 1;
                transition: color 0.2s ease, transform 0.2s ease;
            }

            .tab-item i {
                font-size: 18px;
                transition: transform 0.2s ease;
            }

            .tab-item.active {
                color: var(--color-primary);
                font-weight: 600;
            }

            .tab-item:active {
                transform: scale(0.96);
            }
        }

        /* ============ 区块通用 ============ */
        .section {
            padding: 88px 0;
        }

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

        .section-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 56px;
        }

        .section-header .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--color-primary);
            background: var(--color-primary-light);
            padding: 6px 18px;
            border-radius: var(--radius-pill);
            margin-bottom: 16px;
            font-weight: 600;
        }

        .section-header h2 {
            font-size: clamp(24px, 3vw, 36px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-text);
            margin-bottom: 14px;
        }

        .section-header p {
            font-size: 16px;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        .section-title-bar {
            width: 36px;
            height: 4px;
            background: var(--color-primary);
            border-radius: 4px;
            margin: 14px auto 0;
        }

        @media (max-width: 639.98px) {
            .section {
                padding: 56px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
        }

        /* ============ 分类横幅区 Hero ============ */
        .category-hero {
            padding: 64px 0 48px;
            background: var(--color-bg);
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: "";
            position: absolute;
            top: -40px;
            right: 8%;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(44, 111, 212, 0.06);
            pointer-events: none;
        }

        .hero-card {
            background: var(--color-primary-light);
            border-radius: var(--radius-lg);
            padding: 48px 52px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 48px;
            position: relative;
            z-index: 1;
            border: 1px solid #DCE8F5;
            overflow: hidden;
        }

        .hero-card::after {
            content: "";
            position: absolute;
            right: -50px;
            bottom: -50px;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.45);
        }

        .hero-card-left {
            flex: 1;
            max-width: 58%;
        }

        .hero-card-left .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-primary);
            background: rgba(255, 255, 255, 0.7);
            padding: 6px 16px;
            border-radius: var(--radius-pill);
            margin-bottom: 18px;
        }

        .hero-card-left h1 {
            font-size: clamp(30px, 3.6vw, 42px);
            font-weight: 700;
            line-height: 1.2;
            color: var(--color-primary-dark);
            margin-bottom: 14px;
        }

        .hero-card-left p {
            font-size: 16px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            max-width: 520px;
        }

        .hero-card-right {
            width: 32%;
            background: var(--color-surface);
            border-radius: var(--radius-md);
            padding: 28px 26px;
            box-shadow: var(--shadow-sm);
            position: relative;
            z-index: 2;
        }

        .hero-card-right .icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--color-primary);
            margin-bottom: 16px;
        }

        .hero-card-right h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 8px;
        }

        .hero-card-right p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        @media (max-width: 900px) {
            .hero-card {
                flex-direction: column;
                padding: 36px 30px;
                gap: 28px;
            }
            .hero-card-left {
                max-width: 100%;
            }
            .hero-card-right {
                width: 100%;
            }
        }

        @media (max-width: 639.98px) {
            .category-hero {
                padding: 40px 0 32px;
            }
            .hero-card {
                padding: 28px 22px;
            }
        }

        /* ============ 安全能力概览 ============ */
        .capability-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            height: 100%;
            transition: box-shadow 0.25s ease, transform 0.25s ease;
            position: relative;
            overflow: hidden;
        }

        .capability-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--color-primary);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
        }

        .capability-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        .capability-card:hover::before {
            transform: scaleX(1);
        }

        .cap-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: var(--color-primary-light);
            color: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
        }

        .capability-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 10px;
        }

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

        @media (max-width: 639.98px) {
            .capability-card {
                padding: 24px 20px;
            }
        }

        /* ============ 窄幅双栏图文 ============ */
        .feature-split {
            background: var(--color-surface);
        }

        .feature-split .content-col {
            padding: 20px 12px;
        }

        .feature-split .content-col .row+ .row {
            margin-top: 20px;
            border-top: 1px solid var(--color-border);
            padding-top: 24px;
        }

        .feature-image-wrap {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            height: 100%;
            min-height: 320px;
            position: relative;
        }

        .feature-image-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 320px;
        }

        .feature-image-wrap .img-caption {
            position: absolute;
            bottom: 18px;
            left: 18px;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(4px);
            border-radius: var(--radius-pill);
            padding: 8px 16px;
            font-size: 13px;
            color: var(--color-primary-dark);
            font-weight: 600;
        }

        .feature-text h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .feature-text h3 i {
            color: var(--color-primary);
            font-size: 18px;
        }

        .feature-text p {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.8;
        }

        @media (max-width: 639.98px) {
            .feature-image-wrap {
                min-height: 220px;
            }
            .feature-image-wrap img {
                min-height: 220px;
            }
            .feature-text h3 {
                font-size: 19px;
            }
        }

        /* ============ 安全检查清单 ============ */
        .checklist-section {
            background: var(--color-bg);
        }

        .checklist-wrap {
            max-width: 940px;
            margin: 0 auto;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 44px 48px;
            border: 1px solid var(--color-border);
        }

        .checklist-item {
            display: flex;
            align-items: center;
            gap: 24px;
            padding: 22px 10px;
            border-bottom: 1px solid var(--color-border);
            transition: background 0.2s ease, padding-left 0.2s ease;
            border-radius: 8px;
        }

        .checklist-item:last-child {
            border-bottom: none;
        }

        .checklist-item:hover {
            background: var(--color-primary-light);
            padding-left: 18px;
        }

        .checklist-num {
            width: 40px;
            height: 40px;
            min-width: 40px;
            border-radius: 50%;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-weight: 700;
            font-size: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-variant-numeric: tabular-nums;
        }

        .checklist-body {
            flex: 1;
        }

        .checklist-body h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 4px;
        }

        .checklist-body p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.6;
        }

        .checklist-arrow {
            color: var(--color-muted);
            font-size: 16px;
            transition: color 0.2s ease, transform 0.2s ease;
            min-width: 20px;
        }

        .checklist-item:hover .checklist-arrow {
            color: var(--color-primary);
            transform: translateX(4px);
        }

        @media (max-width: 639.98px) {
            .checklist-wrap {
                padding: 24px 18px;
            }
            .checklist-item {
                gap: 14px;
                padding: 18px 8px;
            }
            .checklist-body p {
                font-size: 13px;
            }
        }

        /* ============ 数据保障 ============ */
        .stats-band {
            background: var(--color-ink);
            border-radius: var(--radius-lg);
            padding: 52px 56px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .stats-band::before {
            content: "";
            position: absolute;
            top: -60px;
            right: 10%;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
        }

        .stats-band::after {
            content: "";
            position: absolute;
            bottom: -30px;
            left: 5%;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
        }

        .stats-band h2 {
            font-size: clamp(22px, 2.6vw, 30px);
            font-weight: 700;
            margin-bottom: 36px;
            position: relative;
            z-index: 1;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            z-index: 1;
        }

        .stat-item {
            text-align: left;
            padding: 20px 24px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.10);
            border-radius: var(--radius-md);
            transition: background 0.25s ease, transform 0.25s ease;
        }

        .stat-item:hover {
            background: rgba(255, 255, 255, 0.10);
            transform: translateY(-2px);
        }

        .stat-icon {
            font-size: 22px;
            color: var(--color-accent);
            margin-bottom: 12px;
        }

        .stat-value {
            font-size: 30px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 6px;
            font-variant-numeric: tabular-nums;
            color: #fff;
        }

        .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.5;
        }

        @media (max-width: 900px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 639.98px) {
            .stats-band {
                padding: 36px 22px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .stat-value {
                font-size: 26px;
            }
        }

        /* ============ FAQ ============ */
        .faq-section {
            background: var(--color-surface);
        }

        .faq-grid {
            max-width: 960px;
            margin: 0 auto;
        }

        .accordion {
            background: transparent !important;
            margin: 0 !important;
        }

        .accordion-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            box-shadow: var(--shadow-sm);
            transition: box-shadow 0.25s ease, border-color 0.25s ease;
            overflow: hidden;
        }

        .accordion-item:hover {
            box-shadow: var(--shadow-md);
        }

        .accordion-item.is-active {
            border-color: rgba(44, 111, 212, 0.35);
            box-shadow: 0 6px 24px rgba(44, 111, 212, 0.08);
        }

        .accordion-title {
            background: transparent !important;
            border: none !important;
            color: var(--color-text) !important;
            font-size: 16px !important;
            font-weight: 600 !important;
            line-height: 1.5 !important;
            display: flex !important;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
            padding: 20px 24px !important;
            position: relative;
            transition: background 0.2s ease, color 0.2s ease;
        }

        .accordion-title::before {
            content: "\f067";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: 13px;
            width: 28px;
            height: 28px;
            min-width: 28px;
            border-radius: 50%;
            border: 1px solid var(--color-border);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--color-surface);
            color: var(--color-muted);
            order: 2;
            transition: all 0.25s ease;
            margin-left: auto;
        }

        .accordion-item.is-active .accordion-title::before {
            content: "\f00d";
            color: var(--color-primary);
            border-color: var(--color-primary);
            transform: rotate(90deg);
        }

        .accordion-title:hover {
            background: var(--color-primary-light) !important;
        }

        .accordion-title:focus {
            outline: 2px solid rgba(44, 111, 212, 0.4);
            outline-offset: -2px;
            border-radius: 10px;
        }

        .accordion-content {
            background: transparent !important;
            border: none !important;
            border-top: 1px solid var(--color-border) !important;
            padding: 16px 24px 22px !important;
            color: var(--color-text-secondary);
            font-size: 14px;
            line-height: 1.85;
        }

        @media (max-width: 639.98px) {
            .accordion-title {
                padding: 16px 18px !important;
                font-size: 15px !important;
                gap: 12px;
            }
            .accordion-content {
                padding: 14px 18px 18px !important;
                font-size: 14px;
            }
        }

        /* ============ 相关分类链接 ============ */
        .related-cats {
            background: var(--color-bg);
            padding: 60px 0 80px;
        }

        .related-card {
            max-width: 820px;
            margin: 0 auto;
            text-align: center;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 44px 48px;
            box-shadow: var(--shadow-sm);
        }

        .related-card h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 10px;
        }

        .related-card>p {
            font-size: 14px;
            color: var(--color-text-secondary);
            margin-bottom: 28px;
        }

        .related-btns {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .related-btns .btn {
            min-width: 160px;
        }

        @media (max-width: 639.98px) {
            .related-cats {
                padding: 44px 0 60px;
            }
            .related-card {
                padding: 30px 22px;
            }
            .related-btns .btn {
                min-width: 130px;
            }
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: var(--color-ink);
            color: rgba(255, 255, 255, 0.75);
            border-top: 3px solid var(--color-primary);
            padding: 64px 0 0;
        }

        .footer-top {
            display: flex;
            justify-content: space-between;
            gap: 48px;
            padding-bottom: 48px;
            flex-wrap: wrap;
        }

        .footer-brand {
            max-width: 340px;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .brand-name i {
            color: var(--color-accent);
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.65);
        }

        .footer-links {
            display: flex;
            gap: 56px;
            flex-wrap: wrap;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            line-height: 2.1;
            color: rgba(255, 255, 255, 0.70);
            transition: color 0.2s ease, transform 0.2s ease;
        }

        .footer-col a:hover {
            color: var(--color-accent);
            transform: translateX(3px);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: 8px;
        }

        @media (max-width: 900px) {
            .footer-top {
                flex-direction: column;
                gap: 36px;
            }
            .footer-links {
                gap: 36px;
            }
        }

        @media (max-width: 639.98px) {
            .site-footer {
                padding-top: 44px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-links {
                gap: 28px;
                flex-direction: column;
            }
        }

        /* ============ 焦点可访问性 ============ */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(44, 111, 212, 0.45);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ============ 栅格间距微调 ============ */
        .row {
            max-width: none;
        }

        .columns {
            padding-left: 12px;
            padding-right: 12px;
        }

        .row .columns+.columns {
            margin-top: 0;
        }

        @media (max-width: 639.98px) {
            .row .columns+.columns {
                margin-top: 20px;
            }
            .row .columns:first-child {
                margin-top: 0;
            }
        }

        /* ============ 通用动画 ============ */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(18px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .hero-card,
        .capability-card,
        .feature-split .columns,
        .checklist-wrap,
        .stats-band,
        .faq-grid,
        .related-card {
            animation: fadeInUp 0.5s ease both;
        }

        .capability-card:nth-child(2) {
            animation-delay: 0.08s;
        }
        .capability-card:nth-child(3) {
            animation-delay: 0.16s;
        }
        .capability-card:nth-child(4) {
            animation-delay: 0.24s;
        }