/* roulang page: index */
:root {
            --sidebar-width: 260px;
            --sidebar-bg: #0b1120;
            --sidebar-bg-hover: #151d33;
            --sidebar-text: #c5cddb;
            --sidebar-text-active: #ffffff;
            --sidebar-accent: #4f6ef7;
            --sidebar-accent-light: #7b93ff;
            --primary: #4f6ef7;
            --primary-hover: #3d56d4;
            --primary-light: #eef1ff;
            --secondary: #7c5cfc;
            --accent-glow: rgba(79, 110, 247, 0.25);
            --body-bg: #f6f7fb;
            --surface: #ffffff;
            --surface-alt: #f0f2f8;
            --text: #1a1d28;
            --text-secondary: #5a6072;
            --text-weak: #8b919e;
            --border: #e2e5f0;
            --border-light: #f0f2f7;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
            --shadow: 0 2px 8px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 8px 32px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 8px 28px rgba(0, 0, 0, 0.10), 0 16px 48px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.14), 0 24px 64px rgba(0, 0, 0, 0.08);
            --transition-fast: 0.15s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', 'Monaco', monospace;
            --section-gap: 80px;
            --section-gap-sm: 48px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background-color: var(--body-bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text);
        }
        h1 {
            font-size: 2.75rem;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 2rem;
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }

        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--sidebar-bg);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            overflow-x: hidden;
            border-right: 1px solid rgba(255, 255, 255, 0.06);
            transition: transform var(--transition-slow), box-shadow var(--transition);
            scrollbar-width: thin;
            scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
        }
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.12);
            border-radius: 4px;
        }

        .sidebar-logo {
            padding: 28px 24px 20px;
            flex-shrink: 0;
        }
        .sidebar-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: 0.01em;
            white-space: nowrap;
        }
        .sidebar-logo .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 4px 14px var(--accent-glow);
        }

        .sidebar-nav {
            flex: 1;
            padding: 8px 16px;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--sidebar-text);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 0.95rem;
            flex-shrink: 0;
        }
        .sidebar-nav a:hover {
            background: var(--sidebar-bg-hover);
            color: #ffffff;
        }
        .sidebar-nav a.active {
            background: rgba(79, 110, 247, 0.2);
            color: #ffffff;
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--sidebar-accent);
        }
        .sidebar-nav a.active i {
            color: var(--sidebar-accent-light);
        }

        .sidebar-cta {
            padding: 20px 24px 28px;
            flex-shrink: 0;
        }
        .sidebar-cta .btn-sidebar {
            display: block;
            width: 100%;
            padding: 12px 20px;
            border-radius: var(--radius);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #ffffff;
            font-weight: 600;
            font-size: 0.9rem;
            text-align: center;
            transition: all var(--transition);
            box-shadow: 0 4px 16px var(--accent-glow);
            letter-spacing: 0.01em;
        }
        .sidebar-cta .btn-sidebar:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(79, 110, 247, 0.4);
            color: #ffffff;
        }

        .main-content {
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: var(--sidebar-bg);
            padding: 12px 16px;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .mobile-header .mobile-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            color: #fff;
            font-size: 1.05rem;
        }
        .mobile-header .mobile-logo .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: 7px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
            color: #fff;
            flex-shrink: 0;
        }
        .mobile-menu-btn {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            color: #fff;
            font-size: 1.3rem;
            transition: background var(--transition-fast);
        }
        .mobile-menu-btn:hover {
            background: var(--sidebar-bg-hover);
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.55);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }
        .mobile-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        .section {
            padding: var(--section-gap) 0;
        }
        .section-sm {
            padding: var(--section-gap-sm) 0;
        }
        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .container-narrow {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 40px;
        }

        .hero-section {
            position: relative;
            padding: 80px 0 90px;
            background: linear-gradient(160deg, #0d1528 0%, #111d38 35%, #0f1a30 70%, #0b1120 100%);
            color: #ffffff;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.35;
            z-index: 1;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60%;
            background: linear-gradient(to top, rgba(11, 17, 32, 0.85) 0%, transparent 100%);
            z-index: 2;
        }
        .hero-inner {
            position: relative;
            z-index: 3;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 50px;
            padding: 8px 18px;
            font-size: 0.85rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 24px;
            backdrop-filter: blur(8px);
            letter-spacing: 0.02em;
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #4ade80;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.6);
            }
            50% {
                box-shadow: 0 0 0 10px rgba(74, 222, 128, 0);
            }
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.15;
            margin-bottom: 18px;
            color: #ffffff;
            max-width: 700px;
        }
        .hero-title .highlight {
            background: linear-gradient(135deg, var(--primary), #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: 1.12rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 540px;
            line-height: 1.7;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 26px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            letter-spacing: 0.01em;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #ffffff;
            box-shadow: 0 4px 18px var(--accent-glow);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(79, 110, 247, 0.45);
            color: #ffffff;
        }
        .btn-outline {
            background: transparent;
            color: #ffffff;
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.55);
            color: #ffffff;
            transform: translateY(-2px);
        }
        .btn-lg {
            padding: 15px 32px;
            font-size: 1rem;
            border-radius: 50px;
        }
        .btn-sm {
            padding: 9px 18px;
            font-size: 0.85rem;
            border-radius: 50px;
        }
        .btn-ghost {
            background: transparent;
            color: var(--primary);
            border: 1.5px solid transparent;
            padding: 10px 18px;
        }
        .btn-ghost:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            color: var(--primary-hover);
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-label {
            display: inline-block;
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--primary);
            background: var(--primary-light);
            padding: 6px 14px;
            border-radius: 50px;
            margin-bottom: 12px;
        }
        .section-header h2 {
            margin-bottom: 10px;
        }
        .section-header .section-subtitle {
            color: var(--text-secondary);
            font-size: 1rem;
            max-width: 500px;
            margin: 0 auto;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .feature-card .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 18px;
            background: var(--primary-light);
            color: var(--primary);
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #ffffff;
            transform: scale(1.05);
        }
        .feature-card h3 {
            margin-bottom: 8px;
            font-size: 1.15rem;
        }
        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.93rem;
            line-height: 1.6;
        }

        .category-entry-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            background: var(--surface);
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .category-entry-card:hover {
            box-shadow: var(--shadow-xl);
            transform: translateY(-2px);
        }
        .category-entry-card .card-visual {
            position: relative;
            min-height: 280px;
            overflow: hidden;
        }
        .category-entry-card .card-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .category-entry-card:hover .card-visual img {
            transform: scale(1.04);
        }
        .category-entry-card .card-visual .card-tag {
            position: absolute;
            top: 18px;
            left: 18px;
            background: rgba(0, 0, 0, 0.65);
            backdrop-filter: blur(6px);
            color: #fff;
            padding: 6px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.03em;
        }
        .category-entry-card .card-info {
            padding: 36px 32px 36px 8px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .category-entry-card .card-info h3 {
            font-size: 1.4rem;
            margin-bottom: 8px;
        }
        .category-entry-card .card-info p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
            margin-bottom: 18px;
        }

        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .stat-card .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--primary);
            font-family: var(--font-mono);
            margin-bottom: 4px;
        }
        .stat-card .stat-label {
            font-size: 0.88rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .news-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 22px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .news-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--primary);
        }
        .news-card .news-thumb {
            width: 70px;
            height: 70px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--surface-alt);
        }
        .news-card .news-info {
            flex: 1;
            min-width: 0;
        }
        .news-card .news-info h4 {
            font-size: 0.98rem;
            margin-bottom: 4px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card .news-info .news-meta {
            font-size: 0.8rem;
            color: var(--text-weak);
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .news-card .news-info .news-excerpt {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 4px;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 20px;
            color: var(--text-weak);
            font-size: 0.95rem;
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border);
        }

        .steps-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .step-item {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .step-item .step-number {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 14px var(--accent-glow);
        }
        .step-item h4 {
            margin-bottom: 6px;
            font-size: 1.05rem;
        }
        .step-item p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.55;
        }

        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .faq-item summary {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 0.98rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            user-select: none;
            color: var(--text);
            transition: color var(--transition-fast);
        }
        .faq-item summary:hover {
            color: var(--primary);
        }
        .faq-item summary .faq-icon {
            flex-shrink: 0;
            transition: transform var(--transition);
            font-size: 0.8rem;
            color: var(--text-weak);
        }
        .faq-item[open] summary .faq-icon {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item .faq-body {
            padding: 0 22px 20px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .cta-section {
            background: linear-gradient(150deg, #0d1528 0%, #111d38 40%, #0f1a30 100%);
            color: #ffffff;
            text-align: center;
            padding: 70px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.2;
            z-index: 1;
        }
        .cta-section .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 600px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .cta-section h2 {
            color: #ffffff;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 28px;
            font-size: 1.02rem;
        }

        .site-footer {
            background: #080c16;
            color: rgba(255, 255, 255, 0.6);
            padding: 48px 0 32px;
            font-size: 0.88rem;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .site-footer .footer-brand {
            font-weight: 700;
            color: #ffffff;
            font-size: 1.05rem;
            margin-bottom: 10px;
        }
        .site-footer .footer-brand-desc {
            line-height: 1.6;
            font-size: 0.85rem;
        }
        .site-footer h5 {
            color: #ffffff;
            font-size: 0.9rem;
            margin-bottom: 12px;
            font-weight: 600;
        }
        .site-footer ul li {
            margin-bottom: 7px;
        }
        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.84rem;
            transition: color var(--transition-fast);
        }
        .site-footer ul li a:hover {
            color: rgba(255, 255, 255, 0.85);
        }
        .footer-bottom {
            max-width: 1100px;
            margin: 28px auto 0;
            padding: 20px 40px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }

        .highlight-text {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }

        .tag {
            display: inline-block;
            padding: 5px 12px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.03em;
        }
        .tag-primary {
            background: var(--primary-light);
            color: var(--primary);
        }
        .tag-outline {
            background: transparent;
            border: 1.5px solid var(--border);
            color: var(--text-secondary);
        }

        @media (max-width: 1200px) {
            .container,
            .container-narrow,
            .hero-inner,
            .site-footer .footer-grid,
            .footer-bottom {
                padding-left: 28px;
                padding-right: 28px;
            }
        }
        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 0px;
            }
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: var(--shadow-xl);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .mobile-overlay {
                display: block;
            }
            .main-content {
                margin-left: 0;
                padding-top: 56px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-list {
                grid-template-columns: 1fr 1fr;
            }
            .steps-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-entry-card {
                grid-template-columns: 1fr;
            }
            .category-entry-card .card-info {
                padding: 24px 28px 28px;
            }
            .category-entry-card .card-visual {
                min-height: 200px;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            h1 {
                font-size: 2.2rem;
            }
            .hero-title {
                font-size: 2.4rem;
            }
            .section {
                padding: 56px 0;
            }
            .section-sm {
                padding: 36px 0;
            }
        }
        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-list {
                grid-template-columns: 1fr;
            }
            .steps-list {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .hero-title {
                font-size: 1.9rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .hero-section {
                padding: 50px 0 60px;
            }
            .container,
            .container-narrow,
            .hero-inner {
                padding-left: 18px;
                padding-right: 18px;
            }
            .section {
                padding: 40px 0;
            }
            .section-sm {
                padding: 28px 0;
            }
            .section-header {
                margin-bottom: 28px;
            }
            h2 {
                font-size: 1.5rem;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
        }
        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.6rem;
            }
            .hero-actions {
                flex-direction: column;
                gap: 10px;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 18px 14px;
            }
            .stat-card .stat-number {
                font-size: 1.6rem;
            }
            .news-card {
                flex-direction: column;
                gap: 10px;
            }
            .news-card .news-thumb {
                width: 100%;
                height: 140px;
            }
            .category-entry-card .card-visual {
                min-height: 160px;
            }
            .category-entry-card .card-info {
                padding: 18px 18px 22px;
            }
            .category-entry-card .card-info h3 {
                font-size: 1.15rem;
            }
        }

/* roulang page: article */
:root {
            --primary: #6366F1;
            --primary-glow: #818CF8;
            --primary-dark: #4F46E5;
            --accent: #06B6D4;
            --accent-glow: #22D3EE;
            --accent-green: #10B981;
            --accent-green-glow: #34D399;
            --bg-root: #080D1A;
            --bg-nav: #0B1424;
            --bg-card: #111B2E;
            --bg-card-hover: #162032;
            --bg-surface: #0F1A2E;
            --bg-input: #1A2740;
            --text-primary: #E8EDF5;
            --text-secondary: #B0BEC5;
            --text-muted: #6B7D8E;
            --text-weak: #475569;
            --border-subtle: #1E2D44;
            --border-medium: #263548;
            --border-glow: rgba(99,102,241,0.35);
            --shadow-card: 0 2px 12px rgba(0,0,0,0.3), 0 0 1px rgba(99,102,241,0.08);
            --shadow-card-hover: 0 8px 28px rgba(0,0,0,0.45), 0 0 0 1px rgba(99,102,241,0.2);
            --shadow-glow-sm: 0 0 12px rgba(99,102,241,0.25);
            --shadow-glow-md: 0 0 24px rgba(6,182,212,0.3);
            --radius-xs: 4px;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 9999px;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;
            --transition-fast: 0.18s cubic-bezier(0.4,0,0.2,1);
            --transition-smooth: 0.3s cubic-bezier(0.4,0,0.2,1);
            --transition-bounce: 0.4s cubic-bezier(0.34,1.56,0.64,1);
            --sidebar-width: 260px;
            --sidebar-width-tablet: 200px;
            --content-max: 820px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-root);
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            display: flex;
            flex-direction: column;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--primary-glow);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            color: inherit;
            font-size: inherit;
        }
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.35;
            font-weight: 700;
            color: var(--text-primary);
        }
        :focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: var(--radius-xs);
        }

        /* ---------- 进度条 ---------- */
        #readingProgressBar {
            position: fixed;
            top: 0;
            left: 0;
            height: 3px;
            width: 0%;
            background: linear-gradient(90deg, var(--primary), var(--accent), var(--accent-green));
            z-index: 10001;
            transition: width 0.1s linear;
            border-radius: 0 2px 2px 0;
            box-shadow: 0 0 10px rgba(99,102,241,0.5);
        }

        /* ---------- 移动端顶栏 ---------- */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 9000;
            height: 56px;
            background: var(--bg-nav);
            border-bottom: 1px solid var(--border-subtle);
            align-items: center;
            justify-content: space-between;
            padding: 0 18px;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
        }
        .mobile-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-primary);
            white-space: nowrap;
        }
        .mobile-logo .logo-icon {
            width: 32px;
            height: 32px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
            flex-shrink: 0;
        }
        .mobile-menu-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--text-primary);
            transition: background var(--transition-fast);
        }
        .mobile-menu-btn:hover {
            background: var(--bg-card);
        }

        /* ---------- 侧边栏 ---------- */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-nav);
            border-right: 1px solid var(--border-subtle);
            z-index: 9500;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            overflow-x: hidden;
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
        }
        .sidebar-header {
            padding: 24px 22px 18px;
            border-bottom: 1px solid var(--border-subtle);
            flex-shrink: 0;
        }
        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 11px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
        }
        .sidebar-logo .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.15rem;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(99,102,241,0.3);
        }
        .sidebar-nav {
            flex: 1;
            padding: 14px 14px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 11px 16px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            position: relative;
        }
        .sidebar-nav a:hover {
            background: var(--bg-card);
            color: var(--text-primary);
        }
        .sidebar-nav a.active {
            background: rgba(99,102,241,0.12);
            color: var(--primary-glow);
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--primary);
        }
        .sidebar-nav a .nav-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--text-weak);
            flex-shrink: 0;
            transition: all var(--transition-fast);
        }
        .sidebar-nav a.active .nav-dot {
            background: var(--accent);
            box-shadow: 0 0 8px var(--accent-glow);
        }
        .sidebar-nav a:hover .nav-dot {
            background: var(--primary-glow);
        }
        .sidebar-footer-meta {
            padding: 14px 22px 18px;
            border-top: 1px solid var(--border-subtle);
            flex-shrink: 0;
            font-size: 0.78rem;
            color: var(--text-weak);
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-footer-meta .online-dot {
            display: inline-block;
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--accent-green);
            margin-right: 6px;
            box-shadow: 0 0 6px var(--accent-green-glow);
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 4px var(--accent-green-glow);
            }
            50% {
                box-shadow: 0 0 14px var(--accent-green-glow), 0 0 22px rgba(16,185,129,0.4);
            }
        }

        /* ---------- 侧边栏遮罩 ---------- */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.55);
            z-index: 9400;
            backdrop-filter: blur(3px);
            -webkit-backdrop-filter: blur(3px);
        }
        .sidebar-overlay.show {
            display: block;
        }

        /* ---------- 主内容区 ---------- */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        .article-container {
            flex: 1;
            max-width: var(--content-max);
            width: 100%;
            margin: 0 auto;
            padding: 36px 28px 50px;
        }

        /* ---------- 面包屑 ---------- */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--primary-glow);
        }
        .breadcrumb .sep {
            font-size: 0.7rem;
            color: var(--text-weak);
        }
        .breadcrumb .current {
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ---------- 文章头图 ---------- */
        .article-hero-image {
            width: 100%;
            aspect-ratio: 16 / 8;
            object-fit: cover;
            border-radius: var(--radius-lg);
            margin-bottom: 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-subtle);
            background: var(--bg-card);
        }
        @media (max-width: 640px) {
            .article-hero-image {
                aspect-ratio: 16 / 10;
                border-radius: var(--radius-md);
            }
        }

        /* ---------- 文章元数据 ---------- */
        .article-meta-row {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 16px;
        }
        .article-category-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 13px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 600;
            background: rgba(99,102,241,0.14);
            color: var(--primary-glow);
            border: 1px solid rgba(99,102,241,0.25);
            white-space: nowrap;
        }
        .article-date {
            font-size: 0.84rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .article-stats-inline {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-left: auto;
        }
        .article-stats-inline span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        /* ---------- 文章标题 ---------- */
        .article-title {
            font-size: 2.1rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 20px;
            color: var(--text-primary);
            letter-spacing: -0.01em;
        }
        @media (max-width: 768px) {
            .article-title {
                font-size: 1.55rem;
            }
        }

        /* ---------- 分隔线 ---------- */
        .divider-glow {
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-medium), var(--border-glow), var(--border-medium), transparent);
            margin: 20px 0 24px;
        }

        /* ---------- 正文内容 ---------- */
        .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-secondary);
        }
        .article-content h2 {
            font-size: 1.55rem;
            margin: 36px 0 16px;
            color: var(--text-primary);
            padding-left: 14px;
            border-left: 3px solid var(--primary);
        }
        .article-content h3 {
            font-size: 1.25rem;
            margin: 28px 0 12px;
            color: var(--text-primary);
        }
        .article-content p {
            margin-bottom: 16px;
        }
        .article-content ul,
        .article-content ol {
            margin: 12px 0 20px 20px;
        }
        .article-content ul li {
            list-style: disc;
            margin-bottom: 7px;
            color: var(--text-secondary);
        }
        .article-content ol li {
            list-style: decimal;
            margin-bottom: 7px;
            color: var(--text-secondary);
        }
        .article-content blockquote {
            border-left: 3px solid var(--accent);
            background: rgba(6,182,212,0.05);
            padding: 14px 18px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 20px 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 20px 0;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-subtle);
        }
        .article-content code {
            background: var(--bg-input);
            padding: 2px 7px;
            border-radius: var(--radius-xs);
            font-family: var(--font-mono);
            font-size: 0.9em;
            color: var(--accent);
            border: 1px solid var(--border-subtle);
        }
        .article-content pre {
            background: var(--bg-input);
            padding: 16px 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 18px 0;
            border: 1px solid var(--border-subtle);
            font-family: var(--font-mono);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-content a {
            color: var(--primary-glow);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--accent-glow);
        }

        /* ---------- 文章底部标签 ---------- */
        .article-tags-row {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 28px;
            padding-top: 18px;
            border-top: 1px solid var(--border-subtle);
        }
        .article-tag-item {
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            background: var(--bg-card);
            color: var(--text-muted);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-fast);
        }
        .article-tag-item:hover {
            border-color: var(--primary);
            color: var(--primary-glow);
            background: rgba(99,102,241,0.08);
        }

        /* ---------- 相关推荐区块 ---------- */
        .related-section {
            margin-top: 44px;
            padding-top: 28px;
            border-top: 2px solid var(--border-subtle);
        }
        .related-section h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section h3::before {
            content: '';
            width: 5px;
            height: 22px;
            border-radius: 3px;
            background: var(--primary);
            display: inline-block;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        @media (max-width: 900px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 560px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .related-card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background: var(--bg-surface);
            border-bottom: 1px solid var(--border-subtle);
        }
        .related-card-body {
            padding: 14px 16px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .related-card-body h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card-body .related-meta {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: auto;
        }

        /* ---------- 内容未找到 ---------- */
        .not-found-state {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-state .nf-icon {
            font-size: 4rem;
            color: var(--text-weak);
            margin-bottom: 18px;
        }
        .not-found-state h2 {
            font-size: 1.6rem;
            margin-bottom: 10px;
        }
        .not-found-state p {
            color: var(--text-muted);
            margin-bottom: 22px;
        }
        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 10px 22px;
            border-radius: var(--radius-full);
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
        }
        .btn-back:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-glow-sm);
            color: #fff;
            transform: translateY(-1px);
        }

        /* ---------- 页脚 ---------- */
        .site-footer {
            background: var(--bg-nav);
            border-top: 1px solid var(--border-subtle);
            padding: 40px 28px 24px;
            color: var(--text-muted);
            font-size: 0.88rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 30px;
            max-width: var(--content-max);
            margin: 0 auto 28px;
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        .footer-brand {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .footer-brand-desc {
            font-size: 0.82rem;
            line-height: 1.6;
            color: var(--text-muted);
        }
        .site-footer h5 {
            color: var(--text-primary);
            margin-bottom: 10px;
            font-size: 0.9rem;
            font-weight: 600;
        }
        .site-footer ul li {
            margin-bottom: 6px;
        }
        .site-footer ul li a {
            color: var(--text-muted);
            font-size: 0.83rem;
            transition: color var(--transition-fast);
        }
        .site-footer ul li a:hover {
            color: var(--primary-glow);
        }
        .footer-bottom {
            text-align: center;
            border-top: 1px solid var(--border-subtle);
            padding-top: 16px;
            font-size: 0.78rem;
            color: var(--text-weak);
            max-width: var(--content-max);
            margin: 0 auto;
        }

        /* ---------- 回到顶部 ---------- */
        .back-to-top {
            position: fixed;
            bottom: 28px;
            right: 28px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            z-index: 8000;
            box-shadow: var(--shadow-glow-sm);
            transition: all var(--transition-bounce);
            opacity: 0;
            pointer-events: none;
            transform: translateY(10px);
        }
        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }
        .back-to-top:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-glow-md);
            transform: translateY(-3px);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1023px) {
            .sidebar {
                width: var(--sidebar-width-tablet);
            }
            .main-wrapper {
                margin-left: var(--sidebar-width-tablet);
            }
            .article-container {
                padding: 28px 20px 40px;
            }
            .article-title {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 767px) {
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: none;
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: 8px 0 30px rgba(0,0,0,0.5);
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: 56px;
            }
            .mobile-header {
                display: flex;
            }
            .article-container {
                padding: 20px 14px 32px;
            }
            .article-title {
                font-size: 1.4rem;
            }
            .article-content {
                font-size: 0.98rem;
            }
            .back-to-top {
                bottom: 18px;
                right: 16px;
                width: 38px;
                height: 38px;
                font-size: 1rem;
            }
        }
        @media (max-width: 480px) {
            .article-meta-row {
                gap: 8px;
            }
            .article-stats-inline {
                margin-left: 0;
                width: 100%;
                justify-content: flex-start;
                margin-top: 4px;
            }
            .article-hero-image {
                aspect-ratio: 16 / 11;
            }
        }

/* roulang page: category1 */
/* ============ 设计变量系统 ============ */
        :root {
            --bg-primary: #0a0e1a;
            --bg-secondary: #060912;
            --bg-card: #111827;
            --bg-card-hover: #161d2e;
            --bg-sidebar: #060912;
            --bg-overlay: rgba(0, 0, 0, 0.65);
            --color-primary: #00d4ff;
            --color-primary-dim: #00a8cc;
            --color-accent: #7c3aed;
            --color-accent-glow: #a78bfa;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --text-primary: #e2e8f0;
            --text-secondary: #b0bec5;
            --text-weak: #6b7280;
            --text-white: #ffffff;
            --border-color: rgba(255, 255, 255, 0.08);
            --border-light: rgba(255, 255, 255, 0.12);
            --border-glow: rgba(0, 212, 255, 0.3);
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
            --shadow-glow: 0 0 24px rgba(0, 212, 255, 0.12);
            --shadow-glow-strong: 0 0 40px rgba(0, 212, 255, 0.2);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 50%;
            --transition-fast: 0.18s ease;
            --transition-normal: 0.28s ease;
            --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 260px;
            --sidebar-collapsed: 72px;
            --header-mobile-height: 60px;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
        }

        /* ============ 基础重置 ============ */
        *,
        *::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-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text-primary);
            background-color: var(--bg-primary);
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-tap-highlight-color: transparent;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            color: inherit;
            font-size: inherit;
        }
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-white);
        }

        /* ============ 侧边栏（桌面端固定） ============ */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            border-right: 1px solid var(--border-color);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            transition: transform var(--transition-slow), width var(--transition-slow);
            overflow-y: auto;
            overflow-x: hidden;
        }
        .sidebar::-webkit-scrollbar {
            width: 3px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
        }
        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 22px 20px 18px;
            border-bottom: 1px solid var(--border-color);
            flex-shrink: 0;
        }
        .sidebar-brand .logo-icon {
            width: 42px;
            height: 42px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 0 18px rgba(0, 212, 255, 0.35);
        }
        .sidebar-brand .logo-text {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 0.02em;
            white-space: nowrap;
            line-height: 1.3;
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav .nav-section-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--text-weak);
            padding: 12px 8px 6px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 11px 14px;
            border-radius: var(--radius-md);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 14.5px;
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-white);
        }
        .sidebar-nav a.active {
            background: rgba(0, 212, 255, 0.1);
            color: var(--color-primary);
            box-shadow: inset 3px 0 0 var(--color-primary);
            font-weight: 600;
        }
        .sidebar-nav a .nav-icon {
            width: 22px;
            text-align: center;
            font-size: 15px;
            flex-shrink: 0;
        }
        .sidebar-nav a .nav-badge {
            margin-left: auto;
            font-size: 11px;
            background: var(--color-accent);
            color: #fff;
            padding: 2px 8px;
            border-radius: 20px;
            font-weight: 600;
            letter-spacing: 0.03em;
        }
        .sidebar-footer-info {
            padding: 16px 20px;
            border-top: 1px solid var(--border-color);
            flex-shrink: 0;
        }
        .sidebar-status {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 12px;
            color: var(--text-weak);
        }
        .sidebar-status .status-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-success);
            box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
            animation: statusPulse 2s infinite;
        }
        @keyframes statusPulse {
            0%,
            100% {
                box-shadow: 0 0 6px rgba(16, 185, 129, 0.5);
            }
            50% {
                box-shadow: 0 0 16px rgba(16, 185, 129, 0.9);
            }
        }
        .sidebar-close-btn {
            display: none;
            position: absolute;
            top: 16px;
            right: 16px;
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.06);
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text-secondary);
            z-index: 10;
            transition: all var(--transition-fast);
        }
        .sidebar-close-btn:hover {
            background: rgba(255, 255, 255, 0.12);
            color: var(--text-white);
        }

        /* ============ 移动端顶部导航 ============ */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-mobile-height);
            background: var(--bg-sidebar);
            border-bottom: 1px solid var(--border-color);
            z-index: 999;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            background: rgba(6, 9, 18, 0.92);
        }
        .mobile-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 15px;
            color: var(--text-white);
            white-space: nowrap;
        }
        .mobile-logo .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 0 14px rgba(0, 212, 255, 0.3);
        }
        .mobile-menu-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
        }
        .mobile-menu-btn:hover {
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-white);
        }

        /* ============ 遮罩层 ============ */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: var(--bg-overlay);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition-normal);
            pointer-events: none;
        }
        .sidebar-overlay.active {
            opacity: 1;
            pointer-events: auto;
        }

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

        /* ============ 分类Banner ============ */
        .category-banner {
            position: relative;
            padding: 60px 40px;
            background: linear-gradient(160deg, #0d1425 0%, #0a1020 40%, #080d18 100%);
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.18;
            z-index: 0;
        }
        .category-banner::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 40%, rgba(124, 58, 237, 0.06) 0%, transparent 55%);
            z-index: 0;
        }
        .category-banner .banner-inner {
            position: relative;
            z-index: 1;
            max-width: 1000px;
        }
        .category-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-weak);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .category-banner .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }
        .category-banner .breadcrumb a:hover {
            color: var(--color-primary);
        }
        .category-banner .breadcrumb .separator {
            color: var(--text-weak);
            font-size: 10px;
        }
        .category-banner .banner-title {
            font-size: clamp(28px, 4vw, 44px);
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            line-height: 1.2;
        }
        .category-banner .banner-title .highlight {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-glow) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .category-banner .banner-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            line-height: 1.7;
        }
        .category-banner .banner-stats {
            display: flex;
            gap: 32px;
            margin-top: 24px;
            flex-wrap: wrap;
        }
        .category-banner .stat-item {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .category-banner .stat-value {
            font-size: 28px;
            font-weight: 700;
            color: var(--color-primary);
            font-family: var(--font-mono);
            letter-spacing: -0.02em;
        }
        .category-banner .stat-label {
            font-size: 12px;
            color: var(--text-weak);
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }

        /* ============ 内容区域容器 ============ */
        .content-section {
            padding: 48px 40px;
            max-width: 1200px;
        }
        .section-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 28px;
            flex-wrap: wrap;
            gap: 16px;
        }
        .section-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-white);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .section-title .title-accent {
            width: 4px;
            height: 24px;
            border-radius: 2px;
            background: var(--color-primary);
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
        }
        .section-subtitle {
            font-size: 14px;
            color: var(--text-weak);
            margin-top: 4px;
        }

        /* ============ 筛选标签 ============ */
        .filter-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .filter-tag {
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .filter-tag:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--border-light);
            color: var(--text-white);
        }
        .filter-tag.active {
            background: rgba(0, 212, 255, 0.12);
            border-color: var(--border-glow);
            color: var(--color-primary);
            font-weight: 600;
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.15);
        }

        /* ============ 文章卡片网格 ============ */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 24px;
        }
        .article-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-normal);
            display: flex;
            flex-direction: column;
            position: relative;
        }
        .article-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-light);
            box-shadow: var(--shadow-lg), var(--shadow-glow);
            background: var(--bg-card-hover);
        }
        .article-card .card-img-wrap {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: #0d1525;
        }
        .article-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .article-card:hover .card-img-wrap img {
            transform: scale(1.05);
        }
        .article-card .card-img-wrap .level-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 10px;
            border-radius: 14px;
            font-size: 11px;
            font-weight: 600;
            letter-spacing: 0.04em;
            z-index: 2;
        }
        .level-badge.beginner {
            background: rgba(16, 185, 129, 0.2);
            color: #10b981;
            border: 1px solid rgba(16, 185, 129, 0.3);
        }
        .level-badge.advanced {
            background: rgba(245, 158, 11, 0.2);
            color: #f59e0b;
            border: 1px solid rgba(245, 158, 11, 0.3);
        }
        .level-badge.deep {
            background: rgba(239, 68, 68, 0.2);
            color: #ef4444;
            border: 1px solid rgba(239, 68, 68, 0.3);
        }
        .article-card .card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .article-card .card-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .article-card .card-tag {
            font-size: 11px;
            padding: 3px 9px;
            border-radius: 10px;
            background: rgba(0, 212, 255, 0.08);
            color: var(--color-primary);
            font-weight: 500;
            letter-spacing: 0.03em;
        }
        .article-card .card-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-white);
            line-height: 1.45;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card .card-excerpt {
            font-size: 13.5px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .article-card .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 12px;
            color: var(--text-weak);
            padding-top: 6px;
            border-top: 1px solid var(--border-color);
        }
        .article-card .card-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        /* ============ 热门排行板块 ============ */
        .hot-rank-section {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
        }
        .hot-rank-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .hot-rank-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            cursor: pointer;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }
        .hot-rank-item:last-child {
            border-bottom: none;
        }
        .hot-rank-item:hover {
            background: rgba(255, 255, 255, 0.03);
        }
        .hot-rank-item .rank-num {
            width: 32px;
            height: 32px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 15px;
            flex-shrink: 0;
            font-family: var(--font-mono);
        }
        .hot-rank-item:nth-child(1) .rank-num {
            background: linear-gradient(135deg, #f59e0b, #d97706);
            color: #fff;
            box-shadow: 0 0 14px rgba(245, 158, 11, 0.4);
        }
        .hot-rank-item:nth-child(2) .rank-num {
            background: linear-gradient(135deg, #94a3b8, #64748b);
            color: #fff;
            box-shadow: 0 0 10px rgba(148, 163, 184, 0.3);
        }
        .hot-rank-item:nth-child(3) .rank-num {
            background: linear-gradient(135deg, #b45309, #92400e);
            color: #fff;
            box-shadow: 0 0 10px rgba(180, 83, 9, 0.3);
        }
        .hot-rank-item .rank-num.other {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-secondary);
        }
        .hot-rank-item .rank-info {
            flex: 1;
            min-width: 0;
        }
        .hot-rank-item .rank-title {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-white);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .hot-rank-item .rank-reads {
            font-size: 11px;
            color: var(--text-weak);
            margin-top: 2px;
        }

        /* ============ 技巧速查标签云 ============ */
        .quick-tips-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .quick-tip-chip {
            padding: 10px 18px;
            border-radius: var(--radius-md);
            font-size: 13.5px;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: 7px;
        }
        .quick-tip-chip:hover {
            background: rgba(0, 212, 255, 0.08);
            border-color: var(--border-glow);
            color: var(--color-primary);
            box-shadow: 0 0 14px rgba(0, 212, 255, 0.1);
        }
        .quick-tip-chip .chip-icon {
            font-size: 14px;
        }

        /* ============ FAQ ============ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            padding: 16px 20px;
            font-weight: 600;
            font-size: 15px;
            color: var(--text-white);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-question .faq-icon {
            font-size: 12px;
            color: var(--text-weak);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-normal), padding var(--transition-normal);
        }
        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 0 20px 16px;
        }
        .faq-answer p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ============ CTA板块 ============ */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.06) 0%, rgba(124, 58, 237, 0.06) 100%);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 40px 32px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(0, 212, 255, 0.06);
            z-index: 0;
            pointer-events: none;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 1;
        }
        .cta-section h3 {
            font-size: 24px;
            margin-bottom: 8px;
        }
        .cta-section p {
            color: var(--text-secondary);
            margin-bottom: 20px;
            font-size: 15px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 15px;
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dim) 100%);
            color: #0a0e1a;
            border: none;
            cursor: pointer;
            transition: all var(--transition-normal);
            box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
            letter-spacing: 0.02em;
        }
        .btn-primary:hover {
            box-shadow: 0 6px 28px rgba(0, 212, 255, 0.45);
            transform: translateY(-2px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 26px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 15px;
            background: transparent;
            border: 1.5px solid var(--border-light);
            color: var(--text-white);
            cursor: pointer;
            transition: all var(--transition-normal);
        }
        .btn-outline:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            box-shadow: 0 0 16px rgba(0, 212, 255, 0.15);
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 40px 40px 24px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            max-width: 1100px;
            margin: 0 auto 28px;
        }
        .footer-brand {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 8px;
        }
        .footer-brand-desc {
            font-size: 13px;
            color: var(--text-weak);
            line-height: 1.6;
        }
        .site-footer h5 {
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--text-weak);
            margin-bottom: 12px;
            font-weight: 600;
        }
        .site-footer ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .site-footer ul li a {
            font-size: 13.5px;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }
        .site-footer ul li a:hover {
            color: var(--color-primary);
        }
        .footer-bottom {
            text-align: center;
            font-size: 12px;
            color: var(--text-weak);
            padding-top: 18px;
            border-top: 1px solid var(--border-color);
            max-width: 1100px;
            margin: 0 auto;
        }

        /* ============ 响应式处理 ============ */
        @media (max-width: 1200px) {
            .articles-grid {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
                gap: 20px;
            }
            .content-section {
                padding: 40px 28px;
            }
            .category-banner {
                padding: 44px 28px;
            }
        }
        @media (max-width: 1024px) {
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                z-index: 1001;
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: var(--shadow-lg);
            }
            .sidebar-close-btn {
                display: flex;
            }
            .sidebar-overlay {
                display: block;
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--header-mobile-height);
            }
            .category-banner {
                padding: 36px 20px;
            }
            .content-section {
                padding: 32px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .articles-grid {
                grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
                gap: 16px;
            }
            .category-banner .banner-stats {
                gap: 20px;
            }
            .category-banner .stat-value {
                font-size: 24px;
            }
        }
        @media (max-width: 768px) {
            .articles-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .content-section {
                padding: 24px 16px;
            }
            .category-banner {
                padding: 28px 16px;
            }
            .category-banner .banner-title {
                font-size: 24px;
            }
            .category-banner .banner-desc {
                font-size: 14px;
            }
            .category-banner .banner-stats {
                gap: 16px;
            }
            .category-banner .stat-value {
                font-size: 22px;
            }
            .section-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .filter-tags {
                gap: 6px;
            }
            .filter-tag {
                padding: 6px 12px;
                font-size: 12px;
            }
            .cta-section {
                padding: 28px 18px;
            }
            .cta-section h3 {
                font-size: 20px;
            }
            .site-footer {
                padding: 28px 16px 18px;
            }
            .hot-rank-item {
                padding: 12px 8px;
                gap: 10px;
            }
            .hot-rank-item .rank-num {
                width: 28px;
                height: 28px;
                font-size: 13px;
            }
            .hot-rank-item .rank-title {
                font-size: 13px;
            }
        }
        @media (max-width: 520px) {
            .category-banner .banner-stats {
                flex-direction: column;
                gap: 10px;
            }
            .category-banner .stat-value {
                font-size: 20px;
            }
            .articles-grid {
                grid-template-columns: 1fr;
            }
            .quick-tips-cloud {
                gap: 6px;
            }
            .quick-tip-chip {
                padding: 8px 14px;
                font-size: 12px;
            }
        }

        /* ============ 辅助类 ============ */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border-width: 0;
        }