/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a5ee6;
            --primary-dark: #0f44b3;
            --primary-light: #e8f0fe;
            --accent: #02b28a;
            --accent-dark: #018e6f;
            --accent-light: #e6faf5;
            --bg: #f5f7fb;
            --surface: #ffffff;
            --text: #0f172a;
            --text-weak: #5b6b7f;
            --border: #e2e8f0;
            --radius: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 1px 4px rgba(15, 23, 42, 0.07);
            --shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }

        button,
        input {
            font-family: inherit;
            outline: none;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 3px solid rgba(26, 94, 230, 0.35);
            outline-offset: 2px;
            border-radius: 6px;
        }

        /* ===== 容器 ===== */
        .container-custom {
            width: 100%;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        @media (min-width: 768px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        /* ===== 按钮 ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.75rem 1.75rem;
            border-radius: 12px;
            border: none;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s, box-shadow 0.3s;
            box-shadow: 0 4px 16px rgba(26, 94, 230, 0.28);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 94, 230, 0.35);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 94, 230, 0.25);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.75rem 1.75rem;
            border-radius: 12px;
            border: 2px solid rgba(255, 255, 255, 0.7);
            cursor: pointer;
            transition: all 0.3s;
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            transform: translateY(-2px);
        }

        .btn-outline-dark {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
            padding: 0.6rem 1.4rem;
            border-radius: 12px;
            border: none;
            cursor: pointer;
            transition: all 0.3s;
        }

        .btn-outline-dark:hover {
            background: #dbe8fe;
            transform: translateY(-2px);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            padding: 0.75rem 2rem;
            border-radius: 12px;
            border: none;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 16px rgba(2, 178, 138, 0.3);
        }

        .btn-accent:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(2, 178, 138, 0.4);
        }

        /* ===== 徽章标签 ===== */
        .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.78rem;
            font-weight: 600;
            padding: 0.3rem 0.9rem;
            border-radius: 999px;
            letter-spacing: 0.2px;
            white-space: nowrap;
        }

        .badge-accent {
            background: var(--accent-light);
            color: var(--accent-dark);
        }

        .badge-amber {
            background: #fef3c7;
            color: #b45309;
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.35s;
            border: 1px solid rgba(226, 232, 240, 0.6);
        }

        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-5px);
        }

        /* ===== 侧边栏导航 ===== */
        .sidebar-link {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.65rem 1rem;
            border-radius: 12px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-weak);
            transition: all 0.25s;
            position: relative;
        }

        .sidebar-link:hover {
            background: var(--primary-light);
            color: var(--primary);
        }

        .sidebar-link.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 94, 230, 0.3);
        }

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

        /* ===== 桌面导航额外样式 ===== */
        .sidebar-nav-wrap {
            height: 100vh;
            position: fixed;
            left: 0;
            top: 0;
            bottom: 0;
            width: 240px;
            background: #fff;
            border-right: 1px solid var(--border);
            display: none;
            flex-direction: column;
            z-index: 30;
        }

        @media (min-width: 1024px) {
            .sidebar-nav-wrap {
                display: flex;
            }
            .main-content-wrap {
                margin-left: 240px;
            }
        }

        /* ===== 移动端顶部栏 ===== */
        .mobile-topbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: #fff;
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 1.25rem;
            z-index: 40;
        }

        @media (min-width: 1024px) {
            .mobile-topbar {
                display: none;
            }
        }

        /* ===== 移动端抽屉 ===== */
        .mobile-drawer {
            position: fixed;
            inset: 0;
            z-index: 50;
            display: none;
        }

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

        .drawer-backdrop {
            position: absolute;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            backdrop-filter: blur(2px);
        }

        .drawer-panel {
            position: absolute;
            top: 0;
            left: 0;
            bottom: 0;
            width: 280px;
            background: #fff;
            box-shadow: 4px 0 30px rgba(0, 0, 0, 0.1);
            padding: 1.5rem;
            overflow-y: auto;
        }

        /* ===== Hero 搜索/表单样式 ===== */
        .input-custom {
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 0.7rem 1.1rem;
            font-size: 0.9rem;
            background: #fff;
            transition: border-color 0.25s, box-shadow 0.25s;
            width: 100%;
        }

        .input-custom:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(26, 94, 230, 0.12);
        }

        /* ===== 板块标题 ===== */
        .section-title {
            font-size: 1.85rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            line-height: 1.25;
        }

        .section-subtitle {
            color: var(--text-weak);
            font-size: 1rem;
            line-height: 1.7;
        }

        @media (max-width: 767px) {
            .section-title {
                font-size: 1.5rem;
            }
        }

        /* ===== 分隔线 ===== */
        .divider-gradient {
            height: 4px;
            border-radius: 999px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            width: 56px;
            margin-top: 1rem;
            margin-bottom: 1rem;
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            transition: all 0.3s;
        }

        .faq-item:hover {
            box-shadow: var(--shadow);
            border-color: #c8d6e8;
        }

        .faq-item summary {
            cursor: pointer;
            list-style: none;
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            border-radius: var(--radius);
        }

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

        .faq-item summary::after {
            content: '+';
            font-size: 1.5rem;
            font-weight: 300;
            color: var(--primary);
            transition: transform 0.3s;
            flex-shrink: 0;
        }

        .faq-item[open] summary::after {
            transform: rotate(45deg);
        }

        .faq-item .faq-answer {
            padding: 0 1.5rem 1.25rem;
            color: var(--text-weak);
            line-height: 1.75;
            font-size: 0.93rem;
        }

        /* ===== 图片遮罩 ===== */
        .cover-mask {
            position: relative;
            overflow: hidden;
        }

        .cover-mask img {
            transition: transform 0.5s ease;
        }

        .cover-mask:hover img {
            transform: scale(1.04);
        }

        .cover-mask::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 55%, rgba(15, 23, 42, 0.45));
            pointer-events: none;
        }

        /* ===== 列表项 ===== */
        .feature-list-item {
            display: flex;
            align-items: flex-start;
            gap: 0.8rem;
            padding: 0.85rem 1rem;
            border-radius: 12px;
            background: #f8fafc;
            border: 1px solid #eef2f7;
            transition: all 0.25s;
        }

        .feature-list-item:hover {
            background: var(--primary-light);
            border-color: #d1dff5;
            transform: translateX(4px);
        }

        /* ===== 页脚 ===== */
        .footer-link {
            color: #94a3b8;
            font-size: 0.88rem;
            transition: color 0.25s;
        }

        .footer-link:hover {
            color: #fff;
        }

        /* ===== 滚动条 ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: #f1f5f9;
        }

        ::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 999px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: #94a3b8;
        }

        /* ===== 动画 ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate-fade-up {
            animation: fadeUp 0.7s ease both;
        }

        @keyframes pulse-soft {
            0%,
            100% {
                box-shadow: 0 4px 20px rgba(2, 178, 138, 0.3);
            }
            50% {
                box-shadow: 0 6px 30px rgba(2, 178, 138, 0.5);
            }
        }

        .pulse-soft {
            animation: pulse-soft 2.4s infinite;
        }

        /* ===== 网站信任徽标 ===== */
        .trust-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.3rem 0.9rem;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            font-size: 0.78rem;
            font-weight: 500;
            backdrop-filter: blur(4px);
        }

        /* ===== 流程步骤 ===== */
        .step-line {
            position: relative;
        }

        .step-line:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 2.5rem;
            left: 2.5rem;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, #dbe8fe, transparent);
        }

        @media (max-width: 767px) {
            .step-line::after {
                display: none;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #f59e0b;
            --primary-hover: #d97706;
            --dark: #0b1220;
            --text: #1e293b;
            --muted: #64748b;
            --border: #e2e8f0;
            --bg-light: #f8fafc;
            --shadow: 0 20px 40px -12px rgba(11, 18, 32, 0.12);
            --radius: 1rem;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg-light);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        .container-custom {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: 260px;
            background: var(--dark);
            z-index: 60;
            transform: translateX(0);
            transition: transform .3s ease;
        }
        .main-wrapper {
            margin-left: 260px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .sidebar-link {
            display: flex;
            align-items: center;
            gap: .625rem;
            padding: .625rem .875rem;
            border-radius: .75rem;
            color: #94a3b8;
            font-size: .875rem;
            font-weight: 500;
            transition: all .2s ease;
        }
        .sidebar-link i {
            font-size: .95rem;
            color: #64748b;
            transition: color .2s ease;
        }
        .sidebar-link:hover {
            background: rgba(255, 255, 255, .06);
            color: #f1f5f9;
        }
        .sidebar-link:hover i {
            color: var(--primary);
        }
        .sidebar-link.active {
            background: linear-gradient(135deg, rgba(245, 158, 11, .18), rgba(245, 158, 11, .08));
            color: #fff;
            box-shadow: inset 0 0 0 1px rgba(245, 158, 11, .2);
        }
        .sidebar-link.active i {
            color: var(--primary);
        }
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 55;
            background: var(--dark);
            padding: .75rem 1rem;
            align-items: center;
            gap: .75rem;
        }
        .overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(11, 18, 32, .6);
            z-index: 59;
            backdrop-filter: blur(4px);
        }
        .overlay.show {
            display: block;
        }
        .category-hero {
            position: relative;
            background-size: cover;
            background-position: center;
            padding: 5rem 0;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(11, 18, 32, .94) 0%, rgba(11, 18, 32, .78) 55%, rgba(11, 18, 32, .48) 100%);
        }
        .login-card {
            background: #fff;
            border-radius: 1.25rem;
            padding: 1.75rem;
            box-shadow: 0 4px 24px rgba(11, 18, 32, .06);
            border: 1px solid #edf2f7;
            transition: all .3s ease;
        }
        .login-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(11, 18, 32, .1);
            border-color: rgba(245, 158, 11, .25);
        }
        .step-item {
            position: relative;
            display: flex;
            gap: 1rem;
            padding-bottom: 2rem;
        }
        .step-item:last-child {
            padding-bottom: 0;
        }
        .step-item::before {
            content: '';
            position: absolute;
            left: 1.25rem;
            top: 2.75rem;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, var(--primary) 0%, rgba(245, 158, 11, .12) 100%);
        }
        .step-item:last-child::before {
            display: none;
        }
        .step-dot {
            flex-shrink: 0;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: .75rem;
            background: linear-gradient(135deg, var(--primary) 0%, #fbbf24 100%);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: .875rem;
            box-shadow: 0 8px 16px rgba(245, 158, 11, .3);
            z-index: 1;
        }
        .faq-item {
            background: #fff;
            border: 1px solid #edf2f7;
            border-radius: 1rem;
            transition: all .2s ease;
            overflow: hidden;
        }
        .faq-item:hover {
            border-color: rgba(245, 158, 11, .3);
        }
        .faq-item[open] {
            box-shadow: 0 8px 24px rgba(11, 18, 32, .08);
        }
        .faq-item summary {
            cursor: pointer;
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            list-style: none;
            transition: background .2s ease;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary:hover {
            background: #fef9eb;
        }
        .faq-item summary .fa-chevron-down {
            transition: transform .3s ease;
            color: var(--primary);
            font-size: .875rem;
        }
        .faq-item[open] summary .fa-chevron-down {
            transform: rotate(180deg);
        }
        .faq-item .faq-answer {
            padding: 0 1.5rem 1.25rem;
            color: var(--muted);
            font-size: .9375rem;
            line-height: 1.8;
        }
        .footer-link {
            font-size: .875rem;
            color: #94a3b8;
            transition: color .2s;
        }
        .footer-link:hover {
            color: #fff !important;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: linear-gradient(135deg, var(--primary) 0%, #fbbf24 100%);
            color: #0b1220 !important;
            font-weight: 700;
            font-size: .9375rem;
            padding: .875rem 1.75rem;
            border-radius: .875rem;
            box-shadow: 0 8px 20px rgba(245, 158, 11, .35);
            transition: all .25s ease;
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(245, 158, 11, .45);
        }
        .btn-primary.btn-light {
            background: #fff;
            color: #0b1220 !important;
            box-shadow: 0 8px 24px rgba(11, 18, 32, .15);
        }
        .btn-primary.btn-light:hover {
            box-shadow: 0 12px 32px rgba(11, 18, 32, .22);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: .9375rem;
            padding: .875rem 1.75rem;
            border-radius: .875rem;
            border: 1px solid rgba(255, 255, 255, .35);
            transition: all .25s ease;
        }
        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(245, 158, 11, .12);
        }
        .feature-card {
            background: rgba(255, 255, 255, .06);
            border: 1px solid rgba(255, 255, 255, .1);
            border-radius: 1rem;
            padding: 1.25rem;
            backdrop-filter: blur(8px);
            transition: all .25s ease;
        }
        .feature-card:hover {
            background: rgba(255, 255, 255, .1);
            border-color: rgba(245, 158, 11, .3);
            transform: translateY(-3px);
        }
        .stat-box {
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .12);
            border-radius: 1.25rem;
            padding: 1.75rem 1.5rem;
            text-align: center;
            backdrop-filter: blur(8px);
        }
        .badge-light {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            background: rgba(245, 158, 11, .1);
            color: var(--primary);
            border: 1px solid rgba(245, 158, 11, .25);
            border-radius: 9999px;
            padding: .4rem 1rem;
            font-size: .8125rem;
            font-weight: 600;
        }
        .badge-dark {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            background: rgba(255, 255, 255, .1);
            color: #fbbf24;
            border: 1px solid rgba(255, 255, 255, .2);
            border-radius: 9999px;
            padding: .4rem 1rem;
            font-size: .8125rem;
            font-weight: 600;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            background: rgba(245, 158, 11, .08);
            color: var(--primary-dark);
            border: 1px solid rgba(245, 158, 11, .2);
            border-radius: 9999px;
            padding: .4rem 1.1rem;
            font-size: .8125rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            color: #0b1220;
            line-height: 1.25;
            margin-bottom: .75rem;
        }
        .section-sub {
            color: var(--muted);
            font-size: 1rem;
            line-height: 1.7;
            max-width: 540px;
        }
        .shadow-card {
            box-shadow: 0 4px 24px rgba(11, 18, 32, .06);
            border: 1px solid #edf2f7;
            border-radius: 1.25rem;
        }
        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: 0 0 60px rgba(0, 0, 0, .4);
            }
            .main-wrapper {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .category-hero {
                padding: 3.25rem 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.8rem !important;
            }
            .login-card {
                padding: 1.25rem;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                justify-content: center;
            }
            .container-custom {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }

/* roulang page: article */
:root {
            --primary: #2563eb;
            --primary-dark: #1e40af;
            --primary-light: #eff6ff;
            --accent: #f59e0b;
            --bg: #f1f5f9;
            --text: #1e293b;
            --text-light: #64748b;
            --border: #e2e8f0;
            --radius: 14px;
            --shadow: 0 4px 24px rgba(2, 12, 27, 0.08);
            --shadow-lg: 0 12px 32px rgba(2, 12, 27, 0.12);
            --navy: #0b1220;
            --navy-light: #111c2e;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            font-size: 15px;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

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

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

        .container-custom {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 640px) {
            .container-custom {
                padding: 0 16px;
            }
        }

        /* ===== 左侧导航 ===== */
        .sidebar {
            position: fixed;
            left: 0;
            top: 0;
            bottom: 0;
            width: 268px;
            background: linear-gradient(180deg, #0b1220 0%, #111c2e 100%);
            z-index: 60;
            display: flex;
            flex-direction: column;
            padding: 24px 20px;
            overflow-y: auto;
            transition: transform .3s ease;
        }

        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 8px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 20px;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: linear-gradient(135deg, #2563eb, #3b82f6);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
            flex-shrink: 0;
        }

        .sidebar-nav-section {
            margin-bottom: 28px;
        }

        .sidebar-nav-title {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: rgba(255, 255, 255, 0.35);
            font-weight: 600;
            padding: 0 12px;
            margin-bottom: 10px;
        }

        .sidebar-link {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 11px 14px;
            border-radius: 12px;
            color: #94a3b8;
            font-size: 14px;
            font-weight: 500;
            transition: all .25s ease;
            margin-bottom: 2px;
        }

        .sidebar-link i {
            font-size: 15px;
            width: 20px;
            text-align: center;
            flex-shrink: 0;
        }

        .sidebar-link:hover {
            background: rgba(255, 255, 255, 0.06);
            color: #f1f5f9;
            transform: translateX(3px);
        }

        .sidebar-link.active {
            background: rgba(37, 99, 235, 0.2);
            color: #ffffff;
            box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.25);
        }

        .sidebar-card {
            margin-top: auto;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 14px;
            padding: 16px;
        }

        .sidebar-card-title {
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-card-text {
            color: rgba(255, 255, 255, 0.55);
            font-size: 12px;
            line-height: 1.6;
        }

        /* ===== 主内容区 ===== */
        .main-area {
            margin-left: 268px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== 移动端顶栏 ===== */
        .mobile-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: rgba(11, 18, 32, 0.98);
            backdrop-filter: blur(12px);
            z-index: 65;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        }

        .mobile-header .mobile-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-weight: 700;
            font-size: 15px;
        }

        .sidebar-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(4px);
            z-index: 55;
            opacity: 0;
            visibility: hidden;
            transition: all .3s ease;
        }

        .sidebar-overlay.show {
            opacity: 1;
            visibility: visible;
        }

        @media (max-width: 1023px) {
            .sidebar {
                transform: translateX(-100%);
                box-shadow: 4px 0 40px rgba(0, 0, 0, 0.3);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-area {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
        }

        @media (min-width: 1024px) {
            .mobile-header {
                display: none;
            }
        }

        /* ===== 文章横幅 ===== */
        .article-hero {
            position: relative;
            border-radius: 0;
            overflow: hidden;
            padding: 80px 0 70px;
            background-image: linear-gradient(135deg, rgba(11, 18, 32, 0.92), rgba(37, 99, 235, 0.75)), url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            color: #fff;
        }

        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
        }

        .article-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
            transition: color .2s;
        }

        .article-hero .breadcrumb a:hover {
            color: #fff;
        }

        .article-hero h1 {
            font-size: clamp(28px, 4vw, 42px);
            font-weight: 800;
            line-height: 1.3;
            max-width: 900px;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
        }

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

        /* ===== 面包屑 ===== */
        .breadcrumb-sep {
            font-size: 10px;
            opacity: 0.5;
        }

        /* ===== 文章主体 ===== */
        .article-section {
            padding: 48px 0;
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
        }

        @media (min-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr 320px;
                align-items: start;
            }
        }

        .article-main {
            min-width: 0;
        }

        .article-card {
            background: #fff;
            border-radius: 18px;
            box-shadow: var(--shadow);
            padding: 40px;
            border: 1px solid rgba(255, 255, 255, 0.6);
        }

        @media (max-width: 640px) {
            .article-card {
                padding: 24px 20px;
                border-radius: 14px;
            }
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 24px;
        }

        .article-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #eff6ff;
            color: #2563eb;
            font-size: 12px;
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 999px;
            border: 1px solid #bfdbfe;
        }

        .article-content {
            font-size: 15px;
            line-height: 1.95;
            color: #334155;
            overflow-wrap: break-word;
        }

        .article-content h2,
        .article-content h3,
        .article-content h4 {
            color: #1e293b;
            font-weight: 700;
            margin: 32px 0 14px;
            line-height: 1.4;
        }

        .article-content h2 {
            font-size: 22px;
            border-left: 4px solid #2563eb;
            padding-left: 14px;
        }

        .article-content h3 {
            font-size: 18px;
        }

        .article-content p {
            margin-bottom: 18px;
        }

        .article-content ul,
        .article-content ol {
            margin: 16px 0 20px;
            padding-left: 22px;
        }

        .article-content ul li,
        .article-content ol li {
            margin-bottom: 8px;
        }

        .article-content ul li::marker {
            color: #2563eb;
        }

        .article-content blockquote {
            border-left: 4px solid #2563eb;
            background: #f8fafc;
            padding: 16px 20px;
            border-radius: 0 12px 12px 0;
            margin: 24px 0;
            color: #475569;
            font-style: italic;
        }

        .article-content img {
            border-radius: 14px;
            margin: 24px 0;
            box-shadow: var(--shadow);
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 14px;
        }

        .article-content table th,
        .article-content table td {
            border: 1px solid #e2e8f0;
            padding: 10px 14px;
            text-align: left;
        }

        .article-content table th {
            background: #f8fafc;
            font-weight: 600;
        }

        /* 内容未找到 */
        .not-found {
            text-align: center;
            padding: 60px 20px;
        }

        .not-found .icon-circle {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: #f1f5f9;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 24px;
            font-size: 28px;
            color: #94a3b8;
        }

        .not-found h2 {
            font-size: 24px;
            color: #1e293b;
            margin-bottom: 8px;
        }

        .not-found p {
            color: #64748b;
            margin-bottom: 24px;
        }

        /* ===== 侧边栏 ===== */
        .sidebar-widget {
            background: #fff;
            border-radius: 16px;
            box-shadow: var(--shadow);
            padding: 24px;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.6);
        }

        .widget-title {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 700;
            color: #1e293b;
            margin-bottom: 16px;
        }

        .widget-title i {
            color: #2563eb;
        }

        .widget-info-list {
            list-style: none;
        }

        .widget-info-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 0;
            border-bottom: 1px solid #f1f5f9;
            font-size: 13px;
            color: #475569;
        }

        .widget-info-list li:last-child {
            border-bottom: none;
        }

        .widget-info-list li i {
            color: #2563eb;
            font-size: 14px;
            width: 18px;
            text-align: center;
        }

        .widget-cat-link {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 14px;
            border-radius: 10px;
            background: #f8fafc;
            color: #334155;
            font-size: 13px;
            font-weight: 500;
            transition: all .2s ease;
            margin-bottom: 8px;
        }

        .widget-cat-link:hover {
            background: #eff6ff;
            color: #2563eb;
            transform: translateX(2px);
        }

        .widget-cat-link i {
            color: #2563eb;
        }

        .widget-safety {
            background: linear-gradient(135deg, #0b1220, #111c2e);
            color: #fff;
            border-radius: 16px;
            padding: 24px;
            box-shadow: var(--shadow);
        }

        .widget-safety h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .widget-safety p {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.6;
        }

        /* ===== 相关阅读 ===== */
        .related-section {
            padding: 48px 0;
            background: #fff;
        }

        .section-label {
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: #2563eb;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .section-title {
            font-size: clamp(22px, 3vw, 32px);
            font-weight: 800;
            color: #1e293b;
            line-height: 1.3;
            margin-bottom: 8px;
        }

        .section-desc {
            color: #64748b;
            font-size: 15px;
            max-width: 620px;
            margin-bottom: 32px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
        }

        @media (min-width: 640px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .related-card {
            background: #fff;
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid #f1f5f9;
            box-shadow: var(--shadow);
            transition: all .3s ease;
            display: flex;
            flex-direction: column;
        }

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

        .related-card-image {
            position: relative;
            height: 180px;
            overflow: hidden;
        }

        .related-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .related-card:hover .related-card-image img {
            transform: scale(1.05);
        }

        .related-card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .related-card-cat {
            font-size: 11px;
            font-weight: 600;
            color: #2563eb;
            background: #eff6ff;
            padding: 3px 10px;
            border-radius: 999px;
            align-self: flex-start;
        }

        .related-card-title {
            font-size: 15px;
            font-weight: 600;
            color: #1e293b;
            line-height: 1.5;
            transition: color .2s;
        }

        .related-card:hover .related-card-title {
            color: #2563eb;
        }

        .related-card-text {
            font-size: 13px;
            color: #64748b;
            line-height: 1.6;
            flex: 1;
        }

        .related-card-more {
            font-size: 13px;
            font-weight: 600;
            color: #2563eb;
            display: flex;
            align-items: center;
            gap: 4px;
            transition: gap .2s;
        }

        .related-card:hover .related-card-more {
            gap: 8px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 48px 0;
            background: var(--bg);
        }

        .faq-item {
            background: #fff;
            border-radius: 14px;
            border: 1px solid #f1f5f9;
            box-shadow: 0 2px 12px rgba(2, 12, 27, 0.04);
            margin-bottom: 14px;
            overflow: hidden;
            transition: all .3s ease;
        }

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

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            background: none;
            border: none;
            text-align: left;
            font-size: 15px;
            font-weight: 600;
            color: #1e293b;
            transition: color .2s;
        }

        .faq-question:hover {
            color: #2563eb;
        }

        .faq-question .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: #eff6ff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            color: #2563eb;
            transition: transform .3s ease, background .3s;
            flex-shrink: 0;
            margin-left: 12px;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: #2563eb;
            color: #fff;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .4s ease;
        }

        .faq-answer-inner {
            padding: 0 22px 20px;
            font-size: 14px;
            color: #64748b;
            line-height: 1.8;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 56px 0;
            background: linear-gradient(135deg, #0b1220, #111c2e);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.3), transparent 50%);
            pointer-events: none;
        }

        .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
        }

        .cta-inner h2 {
            color: #fff;
            font-size: clamp(24px, 4vw, 36px);
            font-weight: 800;
            margin-bottom: 14px;
            line-height: 1.3;
        }

        .cta-inner p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 15px;
            margin-bottom: 28px;
            line-height: 1.7;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #2563eb;
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: 999px;
            border: none;
            box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
            transition: all .3s ease;
            text-decoration: none;
        }

        .btn-primary:hover {
            background: #1d4ed8;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(37, 99, 235, 0.5);
        }

        .btn-primary:focus {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 12px rgba(37, 99, 235, 0.4);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: 999px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: all .3s ease;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        /* ===== 页脚 ===== */
        footer {
            margin-top: auto;
        }

        .footer-link {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            transition: color .2s;
        }

        .footer-link:hover {
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1023px) {
            .article-hero {
                padding: 100px 0 60px;
            }
        }

        @media (max-width: 640px) {
            .article-hero h1 {
                font-size: 24px;
            }
            .article-card {
                padding: 20px 16px;
            }
            .article-content {
                font-size: 14px;
            }
            .related-section,
            .faq-section,
            .article-section,
            .cta-section {
                padding: 36px 0;
            }
            .hero-meta {
                gap: 10px;
                flex-direction: column;
                align-items: flex-start;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 14px;
            }
            .faq-answer-inner {
                padding: 0 16px 16px;
                font-size: 13px;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 380px) {
            .sidebar {
                width: 240px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #2563eb;
            --primary-dark: #1e40af;
            --primary-light: #60a5fa;
            --accent: #f59e0b;
            --text-main: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --surface: #f8fafc;
            --bg-dark: #0b1220;
            --radius: 16px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
            --shadow-md: 0 4px 16px rgba(0,0,0,.06);
            --shadow-lg: 0 12px 32px rgba(0,0,0,.08);
            --transition: .25s ease;
        }

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

        html { scroll-behavior: smooth; }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: #fff;
            color: var(--text-body);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        .sidebar-brand {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(245, 158, 11, 0.08));
            border: 1px solid rgba(37, 99, 235, 0.15);
        }

        .sidebar-link {
            display: flex;
            align-items: center;
            gap: 0.625rem;
            padding: 0.625rem 0.875rem;
            border-radius: 12px;
            color: #64748b;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all var(--transition);
            text-decoration: none;
            position: relative;
        }

        .sidebar-link i {
            font-size: 0.875rem;
            width: 1.25rem;
            text-align: center;
            transition: color var(--transition);
        }

        .sidebar-link:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }

        .sidebar-link.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
        }

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

        .sidebar-link:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

        .mobile-nav-link {
            display: inline-flex;
            align-items: center;
            gap: .375rem;
            padding: .5rem .875rem;
            border-radius: 999px;
            font-size: .8125rem;
            font-weight: 600;
            color: var(--text-body);
            background: #fff;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            text-decoration: none;
            white-space: nowrap;
        }

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

        .mobile-nav-link.active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        .feature-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 1.75rem;
            transition: all .35s ease;
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: opacity var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(37, 99, 235, 0.25);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.125rem;
            background: var(--surface);
            color: var(--primary);
            margin-bottom: 1rem;
            transition: all var(--transition);
        }

        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.05);
        }

        .stat-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 1.75rem;
            text-align: center;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }

        .stat-card:hover {
            box-shadow: var(--shadow-md);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .stat-number {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: .375rem;
            padding: .25rem .75rem;
            border-radius: 999px;
            font-size: .75rem;
            font-weight: 600;
            background: rgba(37, 99, 235, .08);
            color: var(--primary);
        }

        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: 14px;
            padding: 1.25rem 1.5rem;
            transition: all var(--transition);
            background: #fff;
        }

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

        .faq-item summary {
            cursor: pointer;
            font-weight: 600;
            color: var(--text-main);
            outline: none;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }

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

        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: .75rem;
            color: var(--text-muted);
            transition: transform var(--transition);
        }

        .faq-item[open] summary::after {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-item p {
            margin-top: .75rem;
            font-size: .875rem;
            line-height: 1.75;
        }

        .cta-section {
            background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: 10%;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(245, 158, 11, 0.1);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: var(--primary);
            color: #fff;
            padding: .625rem 1.5rem;
            border-radius: 12px;
            font-weight: 600;
            font-size: .875rem;
            transition: all var(--transition);
            text-decoration: none;
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, .3);
        }

        .btn-primary:focus-visible,
        .btn-outline:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: transparent;
            color: var(--primary);
            padding: .625rem 1.5rem;
            border-radius: 12px;
            font-weight: 600;
            font-size: .875rem;
            border: 1.5px solid var(--primary);
            transition: all var(--transition);
            text-decoration: none;
            cursor: pointer;
        }

        .btn-outline:hover {
            background: rgba(37, 99, 235, .08);
            transform: translateY(-1px);
        }

        .cover-img {
            border-radius: var(--radius);
            transition: transform .5s ease;
            display: block;
            width: 100%;
            object-fit: cover;
        }

        .img-card:hover .cover-img {
            transform: scale(1.04);
        }

        .footer-link {
            text-decoration: none;
            color: #64748b;
            transition: color var(--transition);
            font-size: .875rem;
        }

        .footer-link:hover {
            color: #fff;
        }

        /* 移动端菜单 */
        .mobile-menu {
            display: none;
        }

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

        @media (max-width: 1024px) {
            .desktop-sidebar {
                display: none;
            }
            .mobile-header {
                display: block;
            }
        }

        @media (min-width: 1025px) {
            .mobile-header {
                display: none;
            }
            .main-content {
                margin-left: 260px;
            }
        }

        @media (max-width: 768px) {
            .container-custom {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .stat-number {
                font-size: 1.75rem;
            }
            .feature-card {
                padding: 1.25rem;
            }
        }

        @media (max-width: 520px) {
            .stat-card {
                padding: 1.25rem;
            }
            .feature-card {
                padding: 1rem;
            }
        }

        /* 移动端菜单动画 */
        .mobile-menu a {
            display: block;
        }

/* roulang page: category3 */
:root {
        --primary: #2563eb;
        --primary-dark: #1d4ed8;
        --dark: #0b1220;
        --surface: #f8fafc;
        --muted: #64748b;
        --border: #e2e8f0;
        --radius: 1rem;
        --shadow: 0 4px 24px rgba(2, 12, 27, 0.06);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        background: var(--surface);
        color: #0f172a;
        line-height: 1.6;
    }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; height: auto; display: block; }
    .container-custom {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1.5rem;
    }
    /* Sidebar */
    .sidebar-link {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding: 0.75rem 1rem;
        border-radius: 0.65rem;
        font-size: 0.9rem;
        font-weight: 500;
        color: #94a3b8;
        transition: all 0.25s ease;
    }
    .sidebar-link:hover {
        background: rgba(255, 255, 255, 0.06);
        color: #fff;
    }
    .sidebar-link.active {
        background: linear-gradient(135deg, rgba(37, 99, 235, 0.25), rgba(6, 182, 212, 0.15));
        color: #fff;
        box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.3);
        font-weight: 600;
    }
    .sidebar-link.active i {
        color: var(--primary-light);
    }
    /* Mobile drawer */
    .mobile-drawer { transform: translateX(-100%); transition: transform 0.3s ease; }
    .mobile-drawer.open { transform: translateX(0); }
    .drawer-backdrop { opacity: 0; pointer-events: none; transition: opacity 0.3s ease; }
    .drawer-backdrop.open { opacity: 1; pointer-events: auto; }
    /* Hero */
    .hero-banner {
        background-image: url('/assets/images/backpic/back-1.png');
        background-size: cover;
        background-position: center;
        position: relative;
    }
    .hero-banner::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(11, 18, 32, 0.92) 0%, rgba(11, 18, 32, 0.75) 55%, rgba(37, 99, 235, 0.45) 100%);
    }
    .hero-banner > * { position: relative; z-index: 2; }
    /* Buttons */
    .btn-primary {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        background: linear-gradient(135deg, #2563eb, #1d4ed8);
        color: #fff;
        font-weight: 600;
        padding: 0.875rem 2rem;
        border-radius: 0.75rem;
        transition: all 0.25s ease;
        box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
        border: none;
        cursor: pointer;
        font-size: 0.95rem;
    }
    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 28px rgba(37, 99, 235, 0.4);
        background: linear-gradient(135deg, #2563eb, #1e40af);
    }
    .btn-primary:active { transform: translateY(0); box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3); }
    .btn-outline {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        background: transparent;
        color: #e2e8f0;
        font-weight: 500;
        padding: 0.875rem 2rem;
        border-radius: 0.75rem;
        border: 1.5px solid rgba(255, 255, 255, 0.3);
        transition: all 0.25s ease;
        cursor: pointer;
        font-size: 0.95rem;
    }
    .btn-outline:hover {
        border-color: rgba(255, 255, 255, 0.7);
        background: rgba(255, 255, 255, 0.08);
    }
    /* Cards */
    .feature-card {
        background: #fff;
        border-radius: 1rem;
        padding: 1.75rem;
        border: 1px solid var(--border);
        transition: all 0.3s ease;
        box-shadow: var(--shadow);
    }
    .feature-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 16px 40px rgba(2, 12, 27, 0.1);
        border-color: rgba(37, 99, 235, 0.2);
    }
    .feature-card .icon-wrap {
        width: 3.25rem;
        height: 3.25rem;
        border-radius: 0.85rem;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.25rem;
        margin-bottom: 1.25rem;
        background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(6, 182, 212, 0.1));
        color: var(--primary);
        transition: all 0.3s ease;
    }
    .feature-card:hover .icon-wrap {
        background: linear-gradient(135deg, #2563eb, #06b6d4);
        color: #fff;
        box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
    }
    /* Stats */
    .stat-block {
        text-align: center;
        padding: 2rem 1rem;
        border-radius: 1rem;
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.08);
        transition: all 0.3s ease;
    }
    .stat-block:hover {
        background: rgba(255, 255, 255, 0.08);
        border-color: rgba(37, 99, 235, 0.3);
    }
    .stat-number {
        font-size: 2.5rem;
        font-weight: 800;
        background: linear-gradient(135deg, #60a5fa, #06b6d4);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        line-height: 1.2;
    }
    /* Steps */
    .step-item {
        display: flex;
        gap: 1.25rem;
        padding: 1.5rem;
        background: #fff;
        border-radius: 1rem;
        border: 1px solid var(--border);
        transition: all 0.25s ease;
    }
    .step-item:hover {
        box-shadow: var(--shadow);
        border-color: rgba(37, 99, 235, 0.2);
    }
    .step-num {
        flex-shrink: 0;
        width: 2.75rem;
        height: 2.75rem;
        border-radius: 0.75rem;
        background: linear-gradient(135deg, #2563eb, #06b6d4);
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 1.1rem;
        box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }
    /* FAQ */
    .faq-item {
        background: #fff;
        border-radius: 1rem;
        border: 1px solid var(--border);
        overflow: hidden;
        transition: all 0.25s ease;
        margin-bottom: 0.875rem;
    }
    .faq-item:hover { border-color: rgba(37, 99, 235, 0.25); }
    .faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1.25rem 1.5rem;
        cursor: pointer;
        font-weight: 600;
        font-size: 0.95rem;
        color: #0f172a;
        transition: all 0.25s ease;
        background: #fff;
    }
    .faq-question i {
        color: var(--muted);
        transition: transform 0.3s ease;
        font-size: 0.85rem;
    }
    .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--primary); }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
    }
    .faq-answer-inner {
        padding: 0 1.5rem 1.25rem;
        color: var(--muted);
        font-size: 0.9rem;
        line-height: 1.75;
        border-top: 1px solid #f1f5f9;
        padding-top: 1rem;
    }
    .faq-item.open .faq-answer { max-height: 300px; }
    /* CTA */
    .cta-section {
        background-image: url('/assets/images/backpic/back-2.png');
        background-size: cover;
        background-position: center;
        position: relative;
        border-radius: 1.5rem;
        overflow: hidden;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(11, 18, 32, 0.92), rgba(37, 99, 235, 0.7));
    }
    .cta-section > * { position: relative; z-index: 2; }
    /* Footer link */
    .footer-link {
        color: #64748b;
        font-size: 0.875rem;
        transition: all 0.2s ease;
    }
    .footer-link:hover { color: #fff; padding-left: 4px; }
    /* Badge */
    .tag-badge {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
        padding: 0.45rem 1rem;
        border-radius: 999px;
        font-size: 0.8rem;
        font-weight: 500;
        background: rgba(37, 99, 235, 0.1);
        color: var(--primary);
        border: 1px solid rgba(37, 99, 235, 0.2);
    }
    .tag-badge-light {
        background: rgba(255, 255, 255, 0.12);
        color: #e2e8f0;
        border: 1px solid rgba(255, 255, 255, 0.2);
    }
    /* Security score */
    .score-bar {
        height: 8px;
        background: #e2e8f0;
        border-radius: 999px;
        overflow: hidden;
    }
    .score-bar-fill {
        height: 100%;
        border-radius: 999px;
        background: linear-gradient(90deg, #2563eb, #06b6d4);
    }
    /* Main content offset */
    @media (min-width: 1024px) {
        .main-area { margin-left: 240px; }
    }