/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00d4ff;
            --primary-dark: #0099cc;
            --primary-glow: rgba(0, 212, 255, 0.25);
            --secondary: #7c3aed;
            --secondary-glow: rgba(124, 58, 237, 0.25);
            --accent: #f59e0b;
            --accent-glow: rgba(245, 158, 11, 0.2);
            --bg-body: #0b0f1a;
            --bg-sidebar: #0f1525;
            --bg-card: rgba(255, 255, 255, 0.03);
            --bg-card-hover: rgba(255, 255, 255, 0.07);
            --bg-elevated: rgba(255, 255, 255, 0.05);
            --border-color: rgba(255, 255, 255, 0.07);
            --border-glow: rgba(0, 212, 255, 0.15);
            --text-primary: #eef2f6;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --radius: 14px;
            --radius-sm: 8px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.08);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --sidebar-width: 240px;
            --header-height: 64px;
            --max-width: 1200px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: #80e8ff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 600;
            line-height: 1.3;
            color: var(--text-primary);
        }
        h1 {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.6rem);
            letter-spacing: -0.015em;
        }
        h3 {
            font-size: clamp(1.2rem, 2.5vw, 1.6rem);
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        ::selection {
            background: var(--primary);
            color: #000;
        }
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-wide {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 布局 ===== */
        .layout {
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            overflow-y: auto;
            backdrop-filter: blur(12px);
        }
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.08);
            border-radius: 10px;
        }
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== 侧栏品牌 ===== */
        .sidebar-brand {
            padding: 28px 20px 20px;
            border-bottom: 1px solid var(--border-color);
            text-align: center;
        }
        .sidebar-brand .logo {
            display: inline-block;
            font-weight: 700;
            font-size: 1.1rem;
            line-height: 1.3;
            color: #fff;
            letter-spacing: 0.02em;
            text-decoration: none;
        }
        .sidebar-brand .logo span {
            display: block;
            font-size: 0.75rem;
            font-weight: 400;
            color: var(--text-secondary);
            letter-spacing: 0.06em;
            margin-top: 2px;
        }
        .sidebar-brand .logo-icon {
            width: 40px;
            height: 40px;
            margin: 0 auto 10px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            box-shadow: 0 0 30px var(--primary-glow);
        }

        /* ===== 侧栏导航 ===== */
        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--text-muted);
            padding: 0 12px 12px;
            font-weight: 500;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 450;
            transition: var(--transition);
            margin-bottom: 2px;
            text-decoration: none;
            position: relative;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.05);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--primary);
        }
        .sidebar-nav a.active {
            background: rgba(0, 212, 255, 0.08);
            color: #fff;
            border: 1px solid rgba(0, 212, 255, 0.12);
        }
        .sidebar-nav a.active i {
            color: var(--primary);
        }
        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 20px;
            background: var(--primary);
            border-radius: 0 4px 4px 0;
            box-shadow: 0 0 12px var(--primary-glow);
        }

        /* ===== 侧栏底部 ===== */
        .sidebar-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid var(--border-color);
            font-size: 0.7rem;
            color: var(--text-muted);
            text-align: center;
            line-height: 1.5;
        }

        /* ===== 移动端顶部导航 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: rgba(11, 15, 26, 0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            z-index: 999;
            padding: 0 16px;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1rem;
            color: #fff;
            text-decoration: none;
        }
        .mobile-header .logo .logo-icon-small {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
        }
        .mobile-header .hamburger {
            width: 40px;
            height: 40px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            background: rgba(255, 255, 255, 0.04);
        }
        .mobile-header .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }
        .mobile-header .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .mobile-header .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-header .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-header .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== 移动端菜单面板 ===== */
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(11, 15, 26, 0.98);
            backdrop-filter: blur(20px);
            z-index: 998;
            padding: 24px 20px;
            overflow-y: auto;
            transform: translateY(-20px);
            opacity: 0;
            transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            pointer-events: none;
        }
        .mobile-menu.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 1.05rem;
            font-weight: 500;
            text-decoration: none;
            transition: var(--transition);
            margin-bottom: 4px;
            border: 1px solid transparent;
        }
        .mobile-menu a i {
            width: 22px;
            text-align: center;
            color: var(--text-muted);
        }
        .mobile-menu a:hover {
            background: rgba(255, 255, 255, 0.04);
            color: #fff;
        }
        .mobile-menu a.active {
            background: rgba(0, 212, 255, 0.06);
            color: var(--primary);
            border-color: rgba(0, 212, 255, 0.1);
        }
        .mobile-menu a.active i {
            color: var(--primary);
        }
        .mobile-menu .menu-divider {
            height: 1px;
            background: var(--border-color);
            margin: 16px 0;
        }

        /* ===== 首屏 Hero ===== */
        .hero {
            position: relative;
            padding: 100px 24px 80px;
            background: linear-gradient(165deg, #0b0f1a 0%, #0f1a30 50%, #0b0f1a 100%);
            overflow: hidden;
            min-height: 520px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
            mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.2) 70%, transparent 100%);
            -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.2) 70%, transparent 100%);
        }
        .hero::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle at center, rgba(0, 212, 255, 0.06), transparent 70%);
            border-radius: 50%;
            z-index: 0;
            pointer-events: none;
        }
        .hero .container {
            position: relative;
            z-index: 1;
            width: 100%;
        }
        .hero-content {
            max-width: 720px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(0, 212, 255, 0.08);
            border: 1px solid rgba(0, 212, 255, 0.15);
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--primary);
            font-weight: 500;
            letter-spacing: 0.02em;
            margin-bottom: 24px;
        }
        .hero-badge i {
            font-size: 0.7rem;
        }
        .hero-content h1 {
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-content p {
            font-size: 1.15rem;
            max-width: 600px;
            margin-bottom: 32px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            text-decoration: none;
            border: 1px solid transparent;
            cursor: pointer;
            white-space: nowrap;
            background: transparent;
            color: var(--text-primary);
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0f1a;
            border-color: transparent;
            box-shadow: 0 4px 20px var(--primary-glow);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px var(--primary-glow);
            color: #0b0f1a;
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.04);
            border-color: var(--border-color);
            color: var(--text-primary);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        .btn-outline {
            border-color: var(--primary);
            color: var(--primary);
            background: transparent;
        }
        .btn-outline:hover {
            background: rgba(0, 212, 255, 0.08);
            transform: translateY(-2px);
            box-shadow: 0 0 24px var(--primary-glow);
        }
        .btn-lg {
            padding: 14px 36px;
            font-size: 1.05rem;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }
        .btn-icon {
            width: 44px;
            height: 44px;
            padding: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
            position: relative;
        }
        .section-dark {
            background: rgba(255, 255, 255, 0.015);
        }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 52px;
        }
        .section-header h2 {
            margin-bottom: 14px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-muted);
        }
        .section-label {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(0, 212, 255, 0.06);
            border: 1px solid rgba(0, 212, 255, 0.1);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--primary);
            letter-spacing: 0.05em;
            margin-bottom: 16px;
            text-transform: uppercase;
        }
        .section-divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            margin: 12px auto 0;
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: var(--transition);
            backdrop-filter: blur(8px);
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(255, 255, 255, 0.12);
            transform: translateY(-4px);
            box-shadow: var(--shadow), var(--shadow-glow);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 18px;
            background: rgba(0, 212, 255, 0.08);
            color: var(--primary);
            border: 1px solid rgba(0, 212, 255, 0.1);
        }
        .card-icon.purple {
            background: rgba(124, 58, 237, 0.08);
            color: var(--secondary);
            border-color: rgba(124, 58, 237, 0.1);
        }
        .card-icon.gold {
            background: rgba(245, 158, 11, 0.08);
            color: var(--accent);
            border-color: rgba(245, 158, 11, 0.1);
        }
        .card h3 {
            margin-bottom: 10px;
            font-size: 1.15rem;
        }
        .card p {
            font-size: 0.92rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-size: 0.88rem;
            font-weight: 500;
            color: var(--primary);
        }
        .card-link i {
            font-size: 0.75rem;
            transition: var(--transition);
        }
        .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== 网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 24px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        /* ===== 标签/徽章 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 3px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
        }
        .badge-primary {
            background: rgba(0, 212, 255, 0.08);
            color: var(--primary);
            border-color: rgba(0, 212, 255, 0.12);
        }
        .badge-secondary {
            background: rgba(124, 58, 237, 0.08);
            color: var(--secondary);
            border-color: rgba(124, 58, 237, 0.12);
        }
        .badge-accent {
            background: rgba(245, 158, 11, 0.08);
            color: var(--accent);
            border-color: rgba(245, 158, 11, 0.12);
        }

        /* ===== 统计数字 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: var(--bg-card-hover);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            background: linear-gradient(135deg, #fff 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 0.88rem;
            color: var(--text-muted);
            font-weight: 450;
        }

        /* ===== 封面图卡片 ===== */
        .cover-card {
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .cover-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow), var(--shadow-glow);
            border-color: rgba(0, 212, 255, 0.12);
        }
        .cover-card .cover-img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            display: block;
            background: var(--bg-elevated);
        }
        .cover-card .cover-body {
            padding: 20px 22px 24px;
        }
        .cover-card .cover-body h3 {
            font-size: 1.1rem;
            margin-bottom: 6px;
        }
        .cover-card .cover-body p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .cover-card .cover-body .badge-wrap {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 12px;
        }

        /* ===== 资讯列表（CMS） ===== */
        .post-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .post-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 18px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            text-decoration: none;
        }
        .post-item:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 212, 255, 0.1);
            transform: translateX(4px);
        }
        .post-item .post-index {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: rgba(0, 212, 255, 0.06);
            border: 1px solid rgba(0, 212, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--primary);
        }
        .post-item .post-info {
            flex: 1;
            min-width: 0;
        }
        .post-item .post-title {
            font-weight: 500;
            color: var(--text-primary);
            font-size: 0.98rem;
            margin-bottom: 4px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-item .post-meta {
            display: flex;
            gap: 12px;
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        .post-item .post-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .post-empty {
            text-align: center;
            padding: 48px 20px;
            background: var(--bg-card);
            border: 1px dashed var(--border-color);
            border-radius: var(--radius);
            color: var(--text-muted);
        }
        .post-empty i {
            font-size: 2.4rem;
            margin-bottom: 16px;
            opacity: 0.4;
        }

        /* ===== 流程步骤 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            position: relative;
            transition: var(--transition);
        }
        .step-item:hover {
            background: var(--bg-card-hover);
            transform: translateY(-4px);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            font-weight: 700;
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 20px var(--primary-glow);
        }
        .step-item .step-icon {
            font-size: 2rem;
            color: var(--primary);
            margin: 8px 0 14px;
        }
        .step-item h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            background: var(--bg-card-hover);
        }
        .faq-item .faq-question {
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            font-weight: 500;
            font-size: 0.98rem;
            color: var(--text-primary);
            transition: var(--transition);
            user-select: none;
        }
        .faq-item .faq-question i {
            color: var(--text-muted);
            transition: var(--transition);
            font-size: 0.85rem;
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
        }
        .faq-item .faq-answer-inner {
            padding: 0 22px 18px;
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(165deg, #0f1a30, #0b0f1a);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle at center, rgba(0, 212, 255, 0.04), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-content {
            text-align: center;
            max-width: 620px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }
        .cta-content h2 {
            margin-bottom: 14px;
        }
        .cta-content p {
            margin-bottom: 28px;
            font-size: 1.05rem;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-sidebar);
            border-top: 1px solid var(--border-color);
            padding: 48px 24px 32px;
            margin-top: auto;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }
        .footer-brand .logo {
            font-weight: 700;
            font-size: 1.2rem;
            color: #fff;
            margin-bottom: 8px;
            display: block;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: var(--text-muted);
            max-width: 280px;
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            padding: 4px 0;
            font-size: 0.88rem;
            color: var(--text-muted);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-bottom {
            max-width: var(--max-width);
            margin: 32px auto 0;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 1rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-social a:hover {
            background: rgba(0, 212, 255, 0.08);
            border-color: rgba(0, 212, 255, 0.15);
            color: var(--primary);
            transform: translateY(-2px);
        }

        /* ===== 分类入口卡片（特殊） ===== */
        .category-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .category-card {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 24px 28px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            transition: var(--transition);
            text-decoration: none;
        }
        .category-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 212, 255, 0.12);
            transform: translateY(-4px);
            box-shadow: var(--shadow), var(--shadow-glow);
        }
        .category-card .cat-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: rgba(0, 212, 255, 0.06);
            border: 1px solid rgba(0, 212, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            flex-shrink: 0;
        }
        .category-card .cat-info h3 {
            font-size: 1.1rem;
            margin-bottom: 4px;
            color: var(--text-primary);
        }
        .category-card .cat-info p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .category-card .cat-arrow {
            margin-left: auto;
            color: var(--text-muted);
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .category-card:hover .cat-arrow {
            color: var(--primary);
            transform: translateX(4px);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .steps {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                display: none;
            }
            .mobile-header {
                display: flex;
            }
            .mobile-menu {
                display: block;
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .hero {
                padding: 60px 16px 50px;
                min-height: auto;
            }
            .hero-content h1 {
                font-size: 1.8rem;
            }
            .hero-content p {
                font-size: 0.95rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                justify-content: center;
                text-align: center;
            }
            .section {
                padding: 48px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .steps {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .category-card {
                padding: 18px 20px;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .post-item {
                padding: 14px 16px;
            }
            .post-item .post-title {
                font-size: 0.9rem;
            }
            .container {
                padding: 0 16px;
            }
            .container-wide {
                padding: 0 16px;
            }
            .cover-card .cover-body {
                padding: 16px 18px 20px;
            }
            .faq-item .faq-question {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-item .faq-answer-inner {
                padding: 0 16px 14px;
                font-size: 0.85rem;
            }
            .cta-section .btn-lg {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .stat-number {
                font-size: 1.3rem;
            }
            .stat-label {
                font-size: 0.78rem;
            }
            .hero-content h1 {
                font-size: 1.5rem;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .section {
                padding: 36px 0;
            }
            .card {
                padding: 20px 18px;
            }
            .mobile-header {
                padding: 0 12px;
                height: 56px;
            }
            .main-content {
                padding-top: 56px;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .text-gradient {
            background: linear-gradient(135deg, #fff 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .d-none {
            display: none !important;
        }
        @media (max-width: 768px) {
            .d-mobile-none {
                display: none !important;
            }
        }
        @media (min-width: 769px) {
            .d-desktop-none {
                display: none !important;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0b0e1a;
            --primary-light: #141829;
            --primary-mid: #1e2340;
            --accent: #00baff;
            --accent-hover: #33ccff;
            --accent-glow: rgba(0, 186, 255, 0.25);
            --bg: #f0f2f8;
            --card-bg: #ffffff;
            --text: #0b0e1a;
            --text-light: #5a6278;
            --text-muted: #8e96ae;
            --border: #e2e6f0;
            --radius: 14px;
            --radius-sm: 8px;
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.07);
            --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --max-width: 1200px;
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--accent-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        ul,
        ol {
            list-style: none;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 布局：侧边栏 + 主内容 ===== */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
        }

        /* ===== 桌面端侧边栏 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary);
            color: #fff;
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            border-right: 1px solid rgba(255, 255, 255, 0.04);
            transition: transform var(--transition);
        }
        .sidebar-inner {
            display: flex;
            flex-direction: column;
            height: 100%;
            padding: 28px 20px 20px;
        }
        .sidebar .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.3px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            margin-bottom: 28px;
        }
        .sidebar .logo .logo-icon {
            font-size: 26px;
            color: var(--accent);
            filter: drop-shadow(0 0 8px var(--accent-glow));
        }
        .sidebar .logo span:last-child {
            background: linear-gradient(135deg, #fff 60%, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 6px;
            flex: 1;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: rgba(255, 255, 255, 0.5);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: rgba(0, 186, 255, 0.12);
            color: #fff;
            box-shadow: inset 3px 0 0 var(--accent);
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }
        .sidebar-nav a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .sidebar-footer {
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 12px;
            color: rgba(255, 255, 255, 0.35);
            text-align: center;
            line-height: 1.6;
        }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        .main-content-inner {
            flex: 1;
            padding: 40px 0 60px;
        }

        /* ===== 移动端顶部导航 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: var(--primary);
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            z-index: 1100;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .mobile-header .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #fff;
            font-weight: 800;
            font-size: 18px;
        }
        .mobile-header .logo .logo-icon-small {
            font-size: 22px;
            color: var(--accent);
        }
        .hamburger {
            display: flex;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 4px;
            transition: all var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* ===== 移动端菜单面板 ===== */
        .mobile-menu-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 1050;
            backdrop-filter: blur(4px);
            opacity: 0;
            transition: opacity var(--transition);
        }
        .mobile-menu-overlay.open {
            opacity: 1;
        }
        .mobile-menu-panel {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: 280px;
            background: var(--primary);
            z-index: 1060;
            padding: 28px 20px;
            transform: translateX(-100%);
            transition: transform var(--transition);
            overflow-y: auto;
            border-right: 1px solid rgba(255, 255, 255, 0.06);
        }
        .mobile-menu-panel.open {
            transform: translateX(0);
        }
        .mobile-menu-panel .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            padding-bottom: 28px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            margin-bottom: 24px;
        }
        .mobile-menu-panel .logo .logo-icon {
            font-size: 24px;
            color: var(--accent);
        }
        .mobile-menu-panel .logo span:last-child {
            background: linear-gradient(135deg, #fff 60%, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .mobile-menu-panel .sidebar-nav a {
            font-size: 16px;
            padding: 14px 16px;
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px 12px;
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 28px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border);
        }
        .breadcrumb a {
            color: var(--text-light);
            font-weight: 500;
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .sep {
            color: var(--text-muted);
            font-size: 12px;
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 600;
        }

        /* ===== 文章头部 ===== */
        .article-header {
            margin-bottom: 32px;
        }
        .article-header .article-category {
            display: inline-block;
            background: rgba(0, 186, 255, 0.1);
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
            border: 1px solid rgba(0, 186, 255, 0.15);
        }
        .article-header h1 {
            font-size: clamp(26px, 4vw, 40px);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 28px;
            font-size: 14px;
            color: var(--text-light);
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta i {
            color: var(--accent);
            font-size: 14px;
        }

        /* ===== 特色图片 ===== */
        .article-featured-image {
            margin: 28px 0 36px;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: var(--primary-light);
            aspect-ratio: 16 / 7;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .article-featured-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius);
        }

        /* ===== 文章正文 ===== */
        .article-body {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 40px 44px;
            box-shadow: var(--shadow);
            margin-bottom: 36px;
            font-size: 16px;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body p {
            margin-bottom: 1.4em;
        }
        .article-body h2,
        .article-body h3,
        .article-body h4 {
            margin-top: 1.8em;
            margin-bottom: 0.8em;
            font-weight: 700;
            color: var(--text);
        }
        .article-body h2 {
            font-size: 24px;
        }
        .article-body h3 {
            font-size: 20px;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 1.4em;
            padding-left: 24px;
        }
        .article-body li {
            margin-bottom: 0.5em;
            list-style: disc;
        }
        .article-body ol li {
            list-style: decimal;
        }
        .article-body a {
            color: var(--accent);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body a:hover {
            color: var(--accent-hover);
        }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            padding: 12px 20px;
            margin: 1.4em 0;
            background: rgba(0, 186, 255, 0.04);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-body img {
            border-radius: var(--radius-sm);
            margin: 1.2em 0;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
        }
        .article-body code {
            background: #f0f2f8;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: #e74c3c;
        }
        .article-body pre {
            background: var(--primary);
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 1.4em 0;
            font-size: 14px;
            line-height: 1.6;
        }

        /* ===== 文章标签 ===== */
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 32px;
            padding-top: 8px;
        }
        .article-tags .tag {
            display: inline-block;
            background: var(--bg);
            color: var(--text-light);
            font-size: 13px;
            font-weight: 500;
            padding: 6px 16px;
            border-radius: 20px;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 60px 44px;
            text-align: center;
            box-shadow: var(--shadow);
            margin-bottom: 36px;
        }
        .not-found-box .nf-icon {
            font-size: 56px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-light);
            margin-bottom: 24px;
            font-size: 16px;
        }
        .not-found-box .btn {
            display: inline-flex;
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            margin-top: 16px;
        }
        .related-section .section-title {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section .section-title i {
            color: var(--accent);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
        }
        .related-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
        }
        .related-card .rc-image {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--primary-light);
        }
        .related-card .rc-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .related-card:hover .rc-image img {
            transform: scale(1.05);
        }
        .related-card .rc-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .rc-category {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        .related-card .rc-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .rc-title a {
            color: var(--text);
        }
        .related-card .rc-title a:hover {
            color: var(--accent);
        }
        .related-card .rc-meta {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: auto;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .related-card .rc-meta i {
            font-size: 12px;
        }
        .related-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 40px 20px;
            background: var(--card-bg);
            border-radius: var(--radius);
            color: var(--text-muted);
            font-size: 15px;
            border: 1px dashed var(--border);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            border-radius: var(--radius);
            padding: 48px 44px;
            margin-top: 44px;
            text-align: center;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 186, 255, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 {
            color: #fff;
            font-size: clamp(22px, 3vw, 32px);
            font-weight: 800;
            margin-bottom: 12px;
            position: relative;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 16px;
            max-width: 600px;
            margin: 0 auto 28px;
            line-height: 1.6;
            position: relative;
        }
        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            padding: 14px 36px;
            border-radius: 50px;
            box-shadow: 0 4px 24px var(--accent-glow);
            transition: all var(--transition);
            position: relative;
            border: none;
        }
        .cta-section .btn-cta:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 36px rgba(0, 186, 255, 0.4);
            color: #fff;
        }
        .cta-section .btn-cta:focus-visible {
            outline: 2px solid #fff;
            outline-offset: 4px;
        }

        /* ===== 通用按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            background: var(--accent);
            color: #fff;
        }
        .btn:hover {
            background: var(--accent-hover);
            transform: translateY(-1px);
            box-shadow: 0 6px 24px var(--accent-glow);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
            box-shadow: none;
        }
        .btn-outline:hover {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 6px 24px var(--accent-glow);
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 48px 0 0;
            margin-top: auto;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px 32px;
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand .logo {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            display: block;
            margin-bottom: 12px;
            background: linear-gradient(135deg, #fff 60%, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.6);
            font-size: 16px;
            margin-right: 8px;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 20px 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
            gap: 12px;
        }
        .footer-bottom span:last-child {
            color: rgba(255, 255, 255, 0.25);
            font-size: 12px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                display: none;
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: 64px;
            }
            .main-content-inner {
                padding: 24px 0 40px;
            }
            .article-body {
                padding: 24px 20px;
            }
            .article-featured-image {
                aspect-ratio: 16 / 9;
                margin: 20px 0 28px;
            }
            .article-header h1 {
                font-size: 24px;
            }
            .cta-section {
                padding: 36px 24px;
            }
            .cta-section h2 {
                font-size: 22px;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
                padding-bottom: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                padding: 16px 24px;
            }
            .breadcrumb {
                font-size: 13px;
                margin-bottom: 20px;
                padding-bottom: 12px;
            }
            .not-found-box {
                padding: 40px 24px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .container {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .article-body {
                padding: 18px 14px;
                font-size: 15px;
            }
            .article-header h1 {
                font-size: 20px;
            }
            .article-meta {
                font-size: 13px;
                gap: 10px 16px;
            }
            .cta-section {
                padding: 28px 16px;
            }
            .cta-section .btn-cta {
                font-size: 15px;
                padding: 12px 28px;
            }
            .footer-inner {
                padding: 0 16px 20px;
            }
            .footer-bottom {
                padding: 14px 16px;
                font-size: 12px;
            }
            .breadcrumb {
                font-size: 12px;
                gap: 4px 8px;
            }
            .not-found-box {
                padding: 30px 16px;
            }
            .not-found-box .nf-icon {
                font-size: 40px;
            }
            .not-found-box h2 {
                font-size: 22px;
            }
            .related-card .rc-body {
                padding: 14px 16px 16px;
            }
        }

        /* ===== 辅助 ===== */
        .d-desktop-none {
            display: none !important;
        }
        @media (max-width: 768px) {
            .d-desktop-none {
                display: flex !important;
            }
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .gap-12 {
            gap: 12px;
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
:root {
  --primary: #3b82f6;
  --primary-light: #60a5fa;
  --primary-dark: #1d4ed8;
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --purple: #8b5cf6;
  --purple-light: #a78bfa;
  --bg-deep: #080c1a;
  --bg-body: #0d1225;
  --bg-card: rgba(20, 30, 55, 0.85);
  --bg-card-hover: rgba(30, 45, 75, 0.95);
  --bg-sidebar: rgba(10, 16, 32, 0.96);
  --border-color: rgba(59, 130, 246, 0.2);
  --border-glow: rgba(59, 130, 246, 0.35);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.5);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.6);
  --shadow-lg: 0 16px 50px rgba(0,0,0,0.7);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --sidebar-width: 250px;
  --header-height: 64px;
}

/* ===== Reset / 基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea { font-family: inherit; }
ul { list-style: none; }
::selection { background: var(--primary); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* ===== 布局容器 ===== */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ===== 侧边栏 (桌面左侧竖向导航) ===== */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  backdrop-filter: blur(20px);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 2px 0 30px rgba(0,0,0,0.5);
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 28px 22px 18px;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-brand .logo-icon {
  font-size: 28px;
  color: var(--accent);
  filter: drop-shadow(0 0 10px rgba(6,182,212,0.5));
}
.sidebar-brand .logo-text {
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.sidebar-nav {
  flex: 1;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 18px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.sidebar-nav a i { width: 20px; text-align: center; font-size: 17px; }
.sidebar-nav a:hover {
  color: var(--text-primary);
  background: rgba(59,130,246,0.12);
}
.sidebar-nav a.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(59,130,246,0.25), rgba(6,182,212,0.15));
  border: 1px solid var(--border-glow);
  box-shadow: 0 0 20px rgba(59,130,246,0.15);
}
.sidebar-nav a.active::before {
  content: '';
  position: absolute;
  left: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 28px;
  background: var(--accent);
  border-radius: 0 4px 4px 0;
  box-shadow: 0 0 16px var(--accent);
}
.sidebar-footer {
  padding: 20px 22px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

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

/* ===== 移动端顶部导航 ===== */
.mobile-header {
  display: none;
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(13,18,37,0.96);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 20px;
  height: var(--header-height);
  align-items: center;
  justify-content: space-between;
}
.mobile-header .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 18px;
}
.mobile-header .logo-icon-small { font-size: 22px; color: var(--accent); }
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  border-radius: 8px;
  transition: var(--transition);
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 4px;
  transition: var(--transition);
}
.hamburger:hover { background: rgba(59,130,246,0.15); }

/* ===== 移动端抽屉菜单 ===== */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
.mobile-menu-overlay.open { opacity: 1; visibility: visible; }
.mobile-menu-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100vh;
  background: var(--bg-sidebar);
  border-left: 1px solid var(--border-color);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1200;
  box-shadow: -10px 0 40px rgba(0,0,0,0.6);
}
.mobile-menu-overlay.open .mobile-menu-drawer { right: 0; }
.mobile-menu-drawer .drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}
.mobile-menu-drawer .drawer-header .logo-text {
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.mobile-menu-drawer .close-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 22px;
  transition: var(--transition);
}
.mobile-menu-drawer .close-btn:hover { background: rgba(255,255,255,0.08); color: #fff; }
.mobile-menu-drawer .drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mobile-menu-drawer .drawer-nav a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 16px;
  font-weight: 500;
  transition: var(--transition);
}
.mobile-menu-drawer .drawer-nav a i { width: 20px; }
.mobile-menu-drawer .drawer-nav a:hover { color: var(--text-primary); background: rgba(59,130,246,0.12); }
.mobile-menu-drawer .drawer-nav a.active { color: #fff; background: rgba(59,130,246,0.2); border: 1px solid var(--border-glow); }

/* ===== 页面横幅 ===== */
.page-banner {
  position: relative;
  padding: 80px 40px 70px;
  background: linear-gradient(135deg, rgba(8,12,26,0.92), rgba(13,18,37,0.88)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}
.page-banner::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--purple));
  opacity: 0.6;
}
.page-banner h1 {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, #fff, var(--primary-light), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  letter-spacing: 1px;
}
.page-banner p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}
.page-banner .banner-badge {
  display: inline-block;
  margin-bottom: 18px;
  padding: 6px 20px;
  border-radius: 50px;
  background: rgba(59,130,246,0.2);
  border: 1px solid rgba(59,130,246,0.3);
  color: var(--primary-light);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ===== 内容容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 70px 0;
}
.section-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #fff, var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 48px;
  text-align: center;
  line-height: 1.8;
}
.section-header { text-align: center; margin-bottom: 48px; }

/* ===== 卡片通用 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 26px;
  transition: var(--transition);
  backdrop-filter: blur(6px);
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card .card-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
  background: rgba(59,130,246,0.15);
  color: var(--accent);
  border: 1px solid rgba(6,182,212,0.2);
}
.card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; color: #fff; }
.card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.card .card-tag {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(59,130,246,0.15);
  color: var(--primary-light);
  border: 1px solid rgba(59,130,246,0.2);
}

/* ===== 网格 ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 22px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 34px;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  letter-spacing: 0.5px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 4px 20px rgba(59,130,246,0.35);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 35px rgba(59,130,246,0.5);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--primary-light);
  border: 2px solid var(--border-glow);
}
.btn-outline:hover {
  background: rgba(59,130,246,0.15);
  transform: translateY(-3px);
  color: var(--accent-light);
  border-color: var(--accent);
}
.btn-sm { padding: 10px 24px; font-size: 14px; }

/* ===== 标签 / 徽章 ===== */
.badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.badge-blue { background: rgba(59,130,246,0.2); color: var(--primary-light); border: 1px solid rgba(59,130,246,0.25); }
.badge-accent { background: rgba(6,182,212,0.2); color: var(--accent-light); border: 1px solid rgba(6,182,212,0.25); }
.badge-purple { background: rgba(139,92,246,0.2); color: var(--purple-light); border: 1px solid rgba(139,92,246,0.25); }

/* ===== 步骤 / 流程 ===== */
.steps { display: flex; flex-direction: column; gap: 0; counter-reset: step; }
.step-item {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  position: relative;
  border-left: 2px solid var(--border-color);
  padding-left: 40px;
  margin-left: 20px;
  transition: var(--transition);
}
.step-item:last-child { border-left-color: transparent; }
.step-item::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: -18px;
  top: 22px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(59,130,246,0.3);
  border: 2px solid var(--bg-body);
}
.step-item .step-content h4 { font-size: 18px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.step-item .step-content p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ===== 统计数字 ===== */
.stat-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.stat-card {
  text-align: center;
  padding: 32px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--border-glow); transform: translateY(-4px); box-shadow: var(--shadow-md); }
.stat-card .stat-number {
  font-size: 40px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-card .stat-label { font-size: 14px; color: var(--text-secondary); margin-top: 6px; }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--border-glow); }
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
  text-align: left;
  transition: var(--transition);
  gap: 16px;
}
.faq-question:hover { color: var(--primary-light); }
.faq-question i { font-size: 14px; color: var(--primary-light); transition: var(--transition); }
.faq-item.open .faq-question i { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ===== CTA 区块 ===== */
.cta-section {
  background: linear-gradient(135deg, rgba(59,130,246,0.1), rgba(6,182,212,0.08)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
  padding: 80px 24px;
}
.cta-section h2 {
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff, var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.cta-section p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto 32px;
}
.cta-section .cta-buttons { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ===== 图文混合 ===== */
.media-row { display: flex; align-items: center; gap: 50px; }
.media-row .media-text { flex: 1; }
.media-row .media-image { flex: 1; }
.media-row .media-image img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  width: 100%;
  height: auto;
}
.media-row-reverse { flex-direction: row-reverse; }

/* ===== 内容列表 ===== */
.content-list { display: flex; flex-direction: column; gap: 20px; }
.content-list-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.content-list-item:hover { border-color: var(--border-glow); background: var(--bg-card-hover); transform: translateX(6px); }
.content-list-item .list-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59,130,246,0.15);
  color: var(--accent);
  font-size: 18px;
  flex-shrink: 0;
}
.content-list-item .list-text h4 { font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 2px; }
.content-list-item .list-text p { font-size: 13px; color: var(--text-secondary); }

/* ===== 分隔装饰 ===== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
  margin: 0;
  opacity: 0.5;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border-color);
  padding: 50px 40px 30px;
  margin-top: auto;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
}
.footer-brand .logo { font-size: 20px; font-weight: 700; background: linear-gradient(135deg, var(--primary-light), var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.footer-brand p { font-size: 14px; color: var(--text-secondary); margin-top: 12px; line-height: 1.8; max-width: 340px; }
.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(59,130,246,0.1);
  color: var(--text-secondary);
  font-size: 17px;
  margin-right: 10px;
  transition: var(--transition);
  border: 1px solid transparent;
}
.footer-social a:hover { background: rgba(59,130,246,0.2); color: var(--accent-light); border-color: var(--border-glow); transform: translateY(-2px); }
.footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; letter-spacing: 0.5px; }
.footer-col a { display: block; font-size: 14px; color: var(--text-secondary); padding: 5px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--primary-light); padding-left: 6px; }
.footer-bottom {
  max-width: 1200px;
  margin: 36px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2,1fr); }
  .stat-grid { grid-template-columns: repeat(2,1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .page-banner h1 { font-size: 34px; }
  .section-title { font-size: 28px; }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .mobile-header { display: flex; }
  .page-banner { padding: 60px 24px 50px; }
  .page-banner h1 { font-size: 28px; }
  .page-banner p { font-size: 15px; }
  .section { padding: 50px 0; }
  .section-title { font-size: 24px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 20px; }
  .media-row, .media-row-reverse { flex-direction: column; gap: 28px; }
  .stat-grid { grid-template-columns: repeat(2,1fr); gap: 16px; }
  .stat-card .stat-number { font-size: 32px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .steps .step-item { padding-left: 32px; margin-left: 12px; }
  .step-item::before { left: -16px; width: 32px; height: 32px; font-size: 13px; }
  .container { padding: 0 18px; }
  .cta-section { padding: 56px 18px; }
  .cta-section h2 { font-size: 26px; }
  .faq-question { font-size: 15px; padding: 16px 18px; }
}

@media (max-width: 520px) {
  .page-banner h1 { font-size: 24px; }
  .section-title { font-size: 21px; }
  .stat-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-card { padding: 22px 12px; }
  .stat-card .stat-number { font-size: 28px; }
  .btn { padding: 12px 26px; font-size: 14px; }
  .card { padding: 22px 18px; }
  .footer { padding: 36px 20px 24px; }
  .mobile-menu-drawer { width: 280px; right: -290px; }
}