/* roulang page: index */
:root {
            --color-bg: #F4F6F8;
            --color-surface: #FFFFFF;
            --color-ink: #171A1F;
            --color-muted: #5F6B7A;
            --color-primary: #00C896;
            --color-primary-hover: #00A87D;
            --color-primary-soft: #E6F9F2;
            --color-secondary: #FF9F43;
            --color-secondary-hover: #E8892E;
            --color-secondary-soft: #FFF3E6;
            --color-danger: #D64545;
            --color-danger-soft: #FBE7E7;
            --color-border: #E2E6EB;
            --color-dark-section: #1F252B;
            --color-dark-card: #262E35;
            --color-dark-text: #E8ECF0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --shadow-sm: 0 2px 8px rgba(23, 26, 31, 0.05);
            --shadow-md: 0 4px 16px rgba(23, 26, 31, 0.06);
            --shadow-lg: 0 8px 24px rgba(23, 26, 31, 0.12);
            --space-xs: 8px;
            --space-sm: 12px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 40px;
            --space-3xl: 56px;
            --space-4xl: 72px;
            --container-max: 1200px;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }

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

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-ink);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

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

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            color: inherit;
            background: none;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
        }

        button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        h1, h2, h3, h4, h5, h6 {
            line-height: 1.35;
            font-weight: 700;
            color: var(--color-ink);
        }

        h1 {
            font-size: 34px;
        }

        h2 {
            font-size: 24px;
        }

        h3 {
            font-size: 18px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header / Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: 68px;
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(23, 26, 31, 0.04);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }

        .logo {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-ink);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .logo-text {
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 340px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            border-radius: 6px;
            white-space: nowrap;
            transition: color var(--transition-fast), background var(--transition-fast);
        }

        .main-nav a:hover {
            color: var(--color-ink);
            background: var(--color-bg);
        }

        .main-nav a.active {
            color: var(--color-primary);
            background: var(--color-primary-soft);
            font-weight: 600;
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            color: var(--color-ink);
            flex-direction: column;
            gap: 5px;
            transition: background var(--transition-fast);
        }

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

        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--color-ink);
            border-radius: 2px;
            transition: transform var(--transition-base), opacity var(--transition-base);
        }

        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-nav {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            box-shadow: 0 8px 24px rgba(23, 26, 31, 0.12);
            padding: 12px 20px;
            z-index: 999;
            flex-direction: column;
            gap: 6px;
        }

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

        .mobile-nav a {
            display: block;
            padding: 12px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-muted);
            border-radius: 6px;
        }

        .mobile-nav a:hover {
            background: var(--color-bg);
            color: var(--color-ink);
        }

        .mobile-nav a.active {
            color: var(--color-primary);
            background: var(--color-primary-soft);
            font-weight: 600;
        }

        /* Hero */
        .hero {
            background: var(--color-dark-section);
            color: #fff;
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }

        .hero::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 360px;
            height: 360px;
            background: radial-gradient(circle, rgba(0, 200, 150, 0.12), transparent 70%);
            pointer-events: none;
        }

        .hero .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .hero-content h1 {
            color: #fff;
            font-size: 34px;
            margin-bottom: 16px;
            line-height: 1.4;
        }

        .hero-subtitle {
            font-size: 16px;
            color: rgba(232, 236, 240, 0.82);
            margin-bottom: 28px;
            max-width: 520px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0 22px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            white-space: nowrap;
        }

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

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

        .btn-primary:hover {
            background: var(--color-primary-hover);
            color: #fff;
            box-shadow: 0 4px 12px rgba(0, 200, 150, 0.35);
        }

        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.45);
        }

        .btn-outline-light:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: rgba(0, 200, 150, 0.08);
        }

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

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

        .hero-trust {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .hero-trust span {
            display: inline-flex;
            align-items: center;
            padding: 5px 12px;
            font-size: 12px;
            font-weight: 500;
            color: rgba(232, 236, 240, 0.85);
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 20px;
        }

        .hero-visual {
            border-radius: var(--radius-lg);
            overflow: hidden;
            aspect-ratio: 4 / 3;
            background: var(--color-dark-card);
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
        }

        .hero-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .hero-version-tag {
            position: absolute;
            top: 24px;
            right: 24px;
            font-size: 13px;
            font-weight: 600;
            color: rgba(232, 236, 240, 0.6);
            letter-spacing: 0.06em;
        }

        /* Section common */
        .section {
            padding: 64px 0;
        }

        .section-alt {
            background: #fff;
        }

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

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

        .section-head h2 {
            font-size: 24px;
            margin-bottom: 8px;
        }

        .section-head p {
            font-size: 14px;
            color: var(--color-muted);
            max-width: 620px;
        }

        .section-head .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-primary);
            background: var(--color-primary-soft);
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
        }

        /* Quick search / resource bar */
        .resource-bar {
            background: var(--color-bg);
            border-bottom: 1px solid var(--color-border);
            padding: 20px 0;
        }

        .resource-bar .container {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .resource-search {
            flex: 1;
            min-width: 240px;
            display: flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 0 14px;
            height: 44px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .resource-search:focus-within {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(0, 200, 150, 0.12);
        }

        .resource-search input {
            flex: 1;
            height: 100%;
            border: none;
            outline: none;
            font-size: 14px;
            color: var(--color-ink);
            background: transparent;
        }

        .resource-search input::placeholder {
            color: #A0A8B4;
        }

        .resource-search svg {
            flex-shrink: 0;
            width: 18px;
            height: 18px;
            color: var(--color-muted);
        }

        .hot-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }

        .hot-tags a {
            display: inline-flex;
            align-items: center;
            padding: 5px 12px;
            font-size: 12px;
            font-weight: 500;
            color: var(--color-muted);
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: 20px;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
        }

        .hot-tags a:hover {
            color: var(--color-primary);
            border-color: var(--color-primary);
            background: var(--color-primary-soft);
        }

        /* Version matrix */
        .version-matrix {
            background: var(--color-bg);
        }

        .version-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .version-card {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

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

        .version-card-top {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 12px;
        }

        .version-card h3 {
            font-size: 18px;
            margin-bottom: 2px;
        }

        .version-card .version-sub {
            font-size: 13px;
            color: var(--color-muted);
            margin-bottom: 8px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 20px;
            flex-shrink: 0;
        }

        .badge-green {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
        }

        .badge-amber {
            background: var(--color-secondary-soft);
            color: var(--color-secondary-hover);
        }

        .badge-red {
            background: var(--color-danger-soft);
            color: var(--color-danger);
        }

        .version-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
            margin: 8px 0;
        }

        .version-features li {
            font-size: 13px;
            color: var(--color-muted);
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }

        .version-features li::before {
            content: '';
            flex-shrink: 0;
            width: 6px;
            height: 6px;
            background: var(--color-primary);
            border-radius: 50%;
            margin-top: 8px;
        }

        .version-card .btn {
            align-self: flex-start;
            margin-top: 4px;
        }

        /* Category entry grid */
        .entry-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
        }

        .entry-item {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 20px 16px;
            text-align: center;
            transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-fast);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
        }

        .entry-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--color-primary);
        }

        .entry-icon {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--color-primary-soft);
            border-radius: 10px;
            color: var(--color-primary);
            font-size: 20px;
            font-weight: 700;
        }

        .entry-item span {
            font-size: 13px;
            font-weight: 500;
            color: var(--color-ink);
        }

        /* Download rankings */
        .rank-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .rank-row {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 14px 18px;
            display: flex;
            align-items: center;
            gap: 16px;
            transition: box-shadow var(--transition-fast), transform var(--transition-fast);
        }

        .rank-row:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(2px);
        }

        .rank-num {
            width: 34px;
            height: 34px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 700;
            color: var(--color-muted);
            flex-shrink: 0;
            border-radius: 6px;
        }

        .rank-row.top .rank-num {
            background: var(--color-secondary-soft);
            color: var(--color-secondary-hover);
        }

        .rank-info {
            flex: 1;
            min-width: 0;
        }

        .rank-info h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: 2px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .rank-meta {
            display: flex;
            gap: 12px;
            font-size: 12px;
            color: var(--color-muted);
            flex-wrap: wrap;
        }

        .rank-row .btn {
            min-height: 36px;
            padding: 0 16px;
            font-size: 13px;
            flex-shrink: 0;
        }

        .view-more {
            display: flex;
            justify-content: flex-end;
            margin-top: 16px;
        }

        .view-more a {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

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

        /* Install steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .step-card {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 22px 18px;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }

        .step-num {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--color-primary);
            color: #fff;
            border-radius: 50%;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .step-card h4 {
            font-size: 16px;
            margin-bottom: 6px;
        }

        .step-card p {
            font-size: 13px;
            color: var(--color-muted);
        }

        /* Compatibility detector */
        .detector-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 36px;
            align-items: center;
        }

        .detector-info h3 {
            font-size: 20px;
            margin-bottom: 10px;
        }

        .detector-info p {
            font-size: 14px;
            color: var(--color-muted);
            margin-bottom: 16px;
        }

        .detector-tips {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .detector-tips li {
            font-size: 13px;
            color: var(--color-muted);
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }

        .detector-tips li::before {
            content: '✓';
            flex-shrink: 0;
            color: var(--color-primary);
            font-weight: 700;
        }

        .detector-form {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            box-shadow: var(--shadow-md);
        }

        .detector-form .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            margin-bottom: 14px;
        }

        .form-field {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-field label {
            font-size: 13px;
            font-weight: 500;
            color: var(--color-ink);
        }

        .form-field input,
        .form-field select {
            height: 44px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 0 12px;
            font-size: 14px;
            background: #fff;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .form-field input:focus,
        .form-field select:focus {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(0, 200, 150, 0.12);
        }

        .form-hint {
            font-size: 12px;
            color: var(--color-danger);
            display: block;
            margin-bottom: 12px;
        }

        .detector-form .btn {
            width: 100%;
            margin-top: 6px;
        }

        /* CMS list */
        .cms-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .cms-card {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            display: flex;
            flex-direction: column;
        }

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

        .cms-card-image {
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--color-bg);
        }

        .cms-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .cms-card-body {
            padding: 18px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .cms-card-body h3 {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.45;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .cms-card-body p {
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .cms-card-meta {
            display: flex;
            gap: 10px;
            font-size: 12px;
            color: var(--color-muted);
            margin-top: auto;
            padding-top: 8px;
            border-top: 1px solid var(--color-border);
        }

        .cms-card-meta .badge {
            padding: 2px 8px;
            font-size: 11px;
        }

        .empty-state {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 40px 20px;
            border: 2px dashed var(--color-border);
            border-radius: var(--radius-md);
            color: var(--color-muted);
            font-size: 14px;
            background: var(--color-bg);
            text-align: center;
        }

        /* Comparison table */
        .compare-table-wrap {
            overflow-x: auto;
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 620px;
            background: #fff;
        }

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

        .compare-table th {
            background: var(--color-dark-section);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
        }

        .compare-table tr:last-child td {
            border-bottom: none;
        }

        .compare-table tr:nth-child(even) td {
            background: var(--color-bg);
        }

        .compare-table td:first-child {
            font-weight: 600;
            color: var(--color-ink);
            white-space: nowrap;
        }

        /* Scenario cards */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px;
        }

        .scenario-card {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            display: flex;
            flex-direction: column;
        }

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

        .scenario-card-image {
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--color-bg);
        }

        .scenario-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .scenario-card-body {
            padding: 18px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .scenario-card-body h4 {
            font-size: 16px;
            font-weight: 600;
        }

        .scenario-card-body .scenario-version {
            font-size: 12px;
            color: var(--color-primary);
            font-weight: 600;
            display: inline-block;
            background: var(--color-primary-soft);
            padding: 2px 10px;
            border-radius: 20px;
            align-self: flex-start;
        }

        .scenario-card-body p {
            font-size: 13px;
            color: var(--color-muted);
        }

        .scenario-card-body a {
            font-size: 13px;
            color: var(--color-primary);
            font-weight: 500;
            margin-top: auto;
            padding-top: 8px;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .scenario-card-body a:hover {
            color: var(--color-primary-hover);
        }

        /* Stats bar */
        .stats-bar {
            background: var(--color-dark-section);
            background-image: linear-gradient(rgba(31, 37, 43, 0.88), rgba(31, 37, 43, 0.92)), url('/assets/images/eafcd22674cbd20e.webp');
            background-size: cover;
            background-position: center;
            padding: 48px 0;
            color: #fff;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

        .stat-item .stat-num {
            font-size: 36px;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: 0.02em;
        }

        .stat-item .stat-label {
            font-size: 13px;
            color: rgba(232, 236, 240, 0.7);
            margin-top: 4px;
        }

        /* Safety banner */
        .safety-banner {
            background: var(--color-danger-soft);
            border: 1px solid rgba(214, 69, 69, 0.25);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }

        .safety-banner .safety-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--color-danger);
            color: #fff;
            border-radius: 50%;
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .safety-banner h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-danger);
            margin-bottom: 4px;
        }

        .safety-banner p {
            font-size: 13px;
            color: #7A3030;
        }

        .safety-banner a {
            color: var(--color-danger);
            font-weight: 600;
            text-decoration: underline;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            max-width: 840px;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .faq-item:hover {
            border-color: #D0D6DD;
            box-shadow: var(--shadow-sm);
        }

        .faq-item summary {
            list-style: none;
            cursor: pointer;
            padding: 16px 18px;
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }

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

        .faq-item summary::after {
            content: '+';
            font-size: 20px;
            font-weight: 400;
            color: var(--color-muted);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }

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

        .faq-item .faq-answer {
            padding: 0 18px 16px;
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.7;
        }

        .faq-item summary .faq-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-primary);
            flex-shrink: 0;
        }

        /* Bottom CTA */
        .cta-section {
            background: var(--color-dark-section);
            background-image: linear-gradient(rgba(31, 37, 43, 0.9), rgba(31, 37, 43, 0.94)), url('/assets/images/0972f04e2598f633.webp');
            background-size: cover;
            background-position: center;
            padding: 64px 0;
            text-align: center;
            color: #fff;
        }

        .cta-section h2 {
            color: #fff;
            font-size: 28px;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 15px;
            color: rgba(232, 236, 240, 0.75);
            max-width: 560px;
            margin: 0 auto 28px;
        }

        .cta-actions {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--color-dark-section);
            color: rgba(232, 236, 240, 0.7);
            padding: 48px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr 1fr 0.8fr;
            gap: 32px;
            margin-bottom: 32px;
        }

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

        .footer-brand p {
            font-size: 13px;
            color: rgba(232, 236, 240, 0.6);
            line-height: 1.7;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-col a {
            display: block;
            font-size: 13px;
            color: rgba(232, 236, 240, 0.65);
            padding: 4px 0;
            transition: color var(--transition-fast);
        }

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

        .footer-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer-tags span {
            font-size: 12px;
            color: rgba(232, 236, 240, 0.65);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 4px 10px;
            border-radius: 20px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            text-align: center;
            font-size: 12px;
            color: rgba(232, 236, 240, 0.45);
        }

        /* Responsive */
        @media (max-width: 1023px) {
            .hero .container {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero-visual {
                aspect-ratio: 16 / 9;
            }
            .entry-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .cms-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .detector-wrap {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 767px) {
            .site-header {
                height: 60px;
            }
            .main-nav {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .mobile-nav.open {
                display: flex;
            }
            .hero {
                padding: 40px 0;
            }
            .hero-content h1 {
                font-size: 26px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .section {
                padding: 40px 0;
            }
            .section-head h2 {
                font-size: 20px;
            }
            .version-grid {
                grid-template-columns: 1fr;
            }
            .entry-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .cms-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .detector-form .form-row {
                grid-template-columns: 1fr;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item .stat-num {
                font-size: 28px;
            }
            .rank-row {
                flex-wrap: wrap;
                padding: 12px 14px;
            }
            .rank-row .btn {
                width: 100%;
                margin-top: 4px;
                justify-content: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .cta-section h2 {
                font-size: 22px;
            }
            .resource-bar .container {
                flex-direction: column;
                align-items: stretch;
            }
            .logo-text {
                max-width: 200px;
                font-size: 15px;
            }
        }

        @media (max-width: 520px) {
            .entry-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .compare-table th,
            .compare-table td {
                padding: 10px 12px;
                font-size: 12px;
            }
            .btn {
                min-height: 40px;
                font-size: 14px;
                padding: 0 16px;
            }
        }

/* roulang page: category1 */
:root {
            --color-bg: #F4F6F8;
            --color-surface: #FFFFFF;
            --color-ink: #171A1F;
            --color-muted: #5F6B7A;
            --color-primary: #00C896;
            --color-primary-hover: #00A87D;
            --color-primary-soft: #E6F9F2;
            --color-secondary: #FF9F43;
            --color-secondary-hover: #E8892E;
            --color-secondary-soft: #FFF3E6;
            --color-danger: #D64545;
            --color-danger-soft: #FBE7E7;
            --color-border: #E2E6EB;
            --color-dark-section: #1F252B;
            --color-dark-card: #262E35;
            --color-dark-text: #E8ECF0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --shadow-sm: 0 2px 8px rgba(23, 26, 31, 0.05);
            --shadow-md: 0 4px 16px rgba(23, 26, 31, 0.06);
            --shadow-lg: 0 8px 24px rgba(23, 26, 31, 0.12);
            --space-xs: 8px;
            --space-sm: 12px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 40px;
            --space-3xl: 56px;
            --space-4xl: 72px;
            --container-max: 1200px;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-ink);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            margin: 0;
            padding: 0;
        }
        *, *::before, *::after {
            box-sizing: border-box;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            color: inherit;
            background: none;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
        }
        button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: 68px;
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(23, 26, 31, 0.04);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        .logo {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-ink);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo-text {
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 340px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            border-radius: 6px;
            white-space: nowrap;
            transition: color var(--transition-fast), background var(--transition-fast);
        }
        .main-nav a:hover {
            color: var(--color-ink);
            background: var(--color-bg);
        }
        .main-nav a.active {
            color: var(--color-primary);
            background: var(--color-primary-soft);
            font-weight: 600;
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            color: var(--color-ink);
            flex-direction: column;
            gap: 5px;
            transition: background var(--transition-fast);
            position: relative;
        }
        .nav-toggle:hover {
            background: var(--color-bg);
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--color-ink);
            border-radius: 2px;
            transition: transform var(--transition-base), opacity var(--transition-base);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        main {
            display: block;
            min-height: 60vh;
        }
        section {
            padding: var(--space-3xl) 0;
        }
        .section-light {
            background: var(--color-surface);
        }
        .section-gray {
            background: var(--color-bg);
        }
        .section-dark {
            background: var(--color-dark-section);
            color: var(--color-dark-text);
        }
        .section-soft {
            background: var(--color-primary-soft);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            min-height: 40px;
            padding: 9px 20px;
            font-size: 14px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
            text-align: center;
            text-decoration: none;
            border: 1px solid transparent;
            line-height: 1.5;
            cursor: pointer;
        }
        .btn:active {
            transform: translateY(1px);
        }
        .btn:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
            color: #fff;
        }
        .btn-outline-primary {
            background: transparent;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .btn-outline-primary:hover {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            border-color: var(--color-primary);
        }
        .btn-danger-soft {
            background: var(--color-danger-soft);
            color: var(--color-danger);
            border-color: transparent;
        }
        .btn-danger-soft:hover {
            background: #f5d0d0;
            color: #b93838;
        }
        .btn-light {
            background: var(--color-surface);
            color: var(--color-ink);
            border-color: var(--color-border);
        }
        .btn-light:hover {
            background: var(--color-bg);
            color: var(--color-ink);
            border-color: var(--color-border);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 999px;
            line-height: 1.5;
            white-space: nowrap;
        }
        .badge-green {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
        }
        .badge-amber {
            background: var(--color-secondary-soft);
            color: var(--color-secondary-hover);
        }
        .badge-red {
            background: var(--color-danger-soft);
            color: var(--color-danger);
        }
        .badge-gray {
            background: #EEF1F4;
            color: var(--color-muted);
        }
        .badge-dark {
            background: var(--color-dark-card);
            color: var(--color-dark-text);
        }
        .card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            padding: var(--space-lg);
            transition: box-shadow var(--transition-base), transform var(--transition-base);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .card h3 {
            font-size: 17px;
            font-weight: 700;
            margin: 0 0 8px;
            color: var(--color-ink);
            line-height: 1.5;
        }
        .card p {
            font-size: 14px;
            color: var(--color-muted);
            margin: 0 0 12px;
            line-height: 1.7;
        }
        .card-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 12px;
            color: var(--color-muted);
        }
        .card-meta .badge {
            margin-right: 0;
        }
        .section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--color-ink);
            margin: 0 0 8px;
            line-height: 1.4;
        }
        .section-subtitle {
            font-size: 15px;
            color: var(--color-muted);
            margin: 0 0 var(--space-xl);
            line-height: 1.7;
        }
        .section-head {
            margin-bottom: var(--space-xl);
        }
        .section-head .section-title {
            margin-bottom: 6px;
        }
        .divider {
            height: 1px;
            background: var(--color-border);
            border: none;
            margin: 0;
        }
        .stat-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
        }
        .stat-badge .stat-num {
            font-weight: 800;
            font-size: 15px;
        }
        .resource-list {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--color-surface);
            box-shadow: var(--shadow-sm);
        }
        .resource-list-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 14px var(--space-lg);
            border-bottom: 1px solid var(--color-border);
            transition: background var(--transition-fast);
        }
        .resource-list-row:last-child {
            border-bottom: none;
        }
        .resource-list-row:hover {
            background: #FAFCFB;
        }
        .resource-list-main {
            display: flex;
            align-items: center;
            gap: 14px;
            flex: 1;
            min-width: 0;
        }
        .resource-list-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 240px;
        }
        .resource-list-tags {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
        }
        .resource-list-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--color-muted);
            white-space: nowrap;
        }
        .resource-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-primary);
            white-space: nowrap;
        }
        .resource-link:hover {
            color: var(--color-primary-hover);
            text-decoration: underline;
        }
        .tutorial-banner {
            display: flex;
            align-items: center;
            gap: var(--space-2xl);
            background: var(--color-dark-section);
            border-radius: var(--radius-lg);
            overflow: hidden;
            padding: 0;
            color: var(--color-dark-text);
            min-height: 220px;
            transition: transform var(--transition-base), box-shadow var(--transition-base);
        }
        .tutorial-banner:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            color: var(--color-dark-text);
        }
        .tutorial-banner-content {
            flex: 1;
            padding: var(--space-2xl) var(--space-3xl);
        }
        .tutorial-banner-content h3 {
            font-size: 22px;
            font-weight: 700;
            margin: 0 0 10px;
            color: #fff;
        }
        .tutorial-banner-content p {
            font-size: 14px;
            color: #B8C4CE;
            margin: 0 0 16px;
            line-height: 1.7;
        }
        .tutorial-banner-image {
            width: 38%;
            max-width: 380px;
            min-height: 220px;
            object-fit: cover;
        }
        .tutorial-banner-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .fault-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base), border-color var(--transition-base);
            cursor: default;
        }
        .fault-card:hover {
            box-shadow: var(--shadow-md);
            border-color: #D0DAE0;
        }
        .fault-card h4 {
            font-size: 15px;
            font-weight: 700;
            margin: 0 0 6px;
            color: var(--color-ink);
        }
        .fault-card p {
            font-size: 13px;
            color: var(--color-muted);
            margin: 0;
            line-height: 1.6;
        }
        .fault-card .fault-index {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 26px;
            height: 26px;
            border-radius: 6px;
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .faq-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            background: var(--color-surface);
            margin-bottom: 10px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .faq-item:last-child {
            margin-bottom: 0;
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 16px var(--space-lg);
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            background: var(--color-surface);
            cursor: pointer;
            transition: background var(--transition-fast);
            text-align: left;
            border: none;
            min-height: 52px;
        }
        .faq-question:hover {
            background: #FAFCFB;
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--color-primary-soft);
            color: var(--color-primary);
            font-weight: 700;
            font-size: 14px;
            transition: transform var(--transition-base);
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
            background: #FAFCFB;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 14px var(--space-lg) var(--space-lg);
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.7;
        }
        .bottom-return {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            padding: var(--space-2xl) 0;
        }
        .bottom-return .btn {
            min-width: 140px;
        }
        .site-footer {
            background: var(--color-dark-section);
            color: var(--color-dark-text);
            padding: var(--space-3xl) 0 var(--space-lg);
            margin-top: 0;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: var(--space-2xl);
            margin-bottom: var(--space-2xl);
        }
        .site-footer .footer-brand .logo {
            margin-bottom: 12px;
        }
        .site-footer .footer-brand p {
            font-size: 13px;
            color: #AAB6C2;
            margin: 0;
            line-height: 1.7;
            max-width: 320px;
        }
        .site-footer .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 14px;
        }
        .site-footer .footer-col a {
            display: block;
            font-size: 13px;
            color: #AAB6C2;
            padding: 4px 0;
            transition: color var(--transition-fast);
        }
        .site-footer .footer-col a:hover {
            color: var(--color-primary);
        }
        .site-footer .footer-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .site-footer .footer-tags span {
            display: inline-block;
            padding: 5px 12px;
            font-size: 12px;
            background: var(--color-dark-card);
            border-radius: 999px;
            color: #B8C4CE;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid #333C44;
            padding-top: var(--space-lg);
            font-size: 12px;
            color: #8A96A3;
            text-align: center;
            line-height: 1.6;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-muted);
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--color-muted);
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--color-primary);
        }
        .breadcrumb .separator {
            color: #B0BCC6;
        }
        .breadcrumb .current {
            color: var(--color-primary);
            font-weight: 600;
        }
        .page-h1-band {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: var(--space-xl) 0;
        }
        .page-h1-band h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--color-ink);
            margin: 0 0 4px;
            line-height: 1.4;
        }
        .page-h1-band .h1-desc {
            font-size: 14px;
            color: var(--color-muted);
            margin: 0;
            max-width: 680px;
            line-height: 1.7;
        }
        .page-h1-band .h1-right {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .page-h1-row {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .version-download-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
        }
        .version-download-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            transition: box-shadow var(--transition-base), transform var(--transition-base);
        }
        .version-download-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .version-download-card .vd-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .version-download-card .vd-name {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-ink);
        }
        .version-download-card .vd-meta {
            display: flex;
            flex-direction: column;
            gap: 6px;
            font-size: 13px;
            color: var(--color-muted);
            margin-bottom: 14px;
        }
        .version-download-card .vd-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .version-download-card .vd-action {
            margin-top: auto;
        }
        .install-req-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .install-req-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
        }
        .install-req-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }
        .install-req-item h4 {
            font-size: 15px;
            font-weight: 700;
            margin: 0 0 4px;
            color: var(--color-ink);
        }
        .install-req-item p {
            font-size: 13px;
            color: var(--color-muted);
            margin: 0;
            line-height: 1.6;
        }
        .fault-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: var(--space-md);
        }
        @media (max-width: 1023px) {
            .version-download-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .fault-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .install-req-grid {
                grid-template-columns: 1fr 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-xl);
            }
        }
        @media (max-width: 767px) {
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: stretch;
                padding: 12px 20px;
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-md);
                z-index: 999;
                gap: 2px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 14px;
                width: 100%;
                border-radius: 6px;
                font-size: 15px;
            }
            section {
                padding: var(--space-2xl) 0;
            }
            .section-title {
                font-size: 22px;
            }
            .version-download-grid {
                grid-template-columns: 1fr;
            }
            .fault-grid {
                grid-template-columns: 1fr;
            }
            .install-req-grid {
                grid-template-columns: 1fr;
            }
            .tutorial-banner {
                flex-direction: column;
                gap: 0;
            }
            .tutorial-banner-content {
                padding: var(--space-xl);
            }
            .tutorial-banner-image {
                width: 100%;
                max-width: none;
                min-height: 180px;
            }
            .tutorial-banner-image img {
                min-height: 180px;
            }
            .page-h1-band h1 {
                font-size: 22px;
            }
            .resource-list-row {
                flex-direction: column;
                align-items: flex-start;
            }
            .resource-list-main {
                width: 100%;
            }
            .resource-list-meta {
                gap: 10px;
                flex-wrap: wrap;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
            .bottom-return {
                flex-direction: column;
            }
            .bottom-return .btn {
                width: 100%;
                min-width: auto;
            }
        }
        @media (max-width: 520px) {
            .logo-text {
                max-width: 180px;
                font-size: 14px;
            }
            .logo-mark {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
            .site-header {
                height: 60px;
            }
            .main-nav {
                top: 60px;
            }
            .section-title {
                font-size: 20px;
            }
            .page-h1-band h1 {
                font-size: 20px;
            }
            .btn {
                width: 100%;
                min-width: 0;
            }
        }

/* roulang page: article */
:root {
            --color-bg: #F4F6F8;
            --color-surface: #FFFFFF;
            --color-ink: #171A1F;
            --color-muted: #5F6B7A;
            --color-primary: #00C896;
            --color-primary-hover: #00A87D;
            --color-primary-soft: #E6F9F2;
            --color-secondary: #FF9F43;
            --color-secondary-hover: #E8892E;
            --color-secondary-soft: #FFF3E6;
            --color-danger: #D64545;
            --color-danger-soft: #FBE7E7;
            --color-border: #E2E6EB;
            --color-dark-section: #1F252B;
            --color-dark-card: #262E35;
            --color-dark-text: #E8ECF0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --shadow-sm: 0 2px 8px rgba(23, 26, 31, 0.05);
            --shadow-md: 0 4px 16px rgba(23, 26, 31, 0.06);
            --shadow-lg: 0 8px 24px rgba(23, 26, 31, 0.12);
            --space-xs: 8px;
            --space-sm: 12px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 40px;
            --space-3xl: 56px;
            --space-4xl: 72px;
            --container-max: 1200px;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-ink);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            color: inherit;
            background: none;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
        }
        button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        /* Header / Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: 68px;
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(23, 26, 31, 0.04);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        .logo {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-ink);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo-text {
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 340px;
            font-size: 16px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            border-radius: 6px;
            white-space: nowrap;
            transition: color var(--transition-fast), background var(--transition-fast);
        }
        .main-nav a:hover {
            color: var(--color-ink);
            background: var(--color-bg);
        }
        .main-nav a.active {
            color: var(--color-primary);
            background: var(--color-primary-soft);
            font-weight: 600;
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            color: var(--color-ink);
            flex-direction: column;
            gap: 5px;
            transition: background var(--transition-fast);
        }
        .nav-toggle:hover {
            background: var(--color-bg);
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--color-ink);
            border-radius: 2px;
            transition: transform var(--transition-base), opacity var(--transition-base);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-nav {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-md);
            z-index: 999;
            padding: 12px 20px;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-nav.open {
            display: flex;
        }
        .mobile-nav a {
            padding: 12px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-ink);
            border-radius: 6px;
            transition: background var(--transition-fast), color var(--transition-fast);
        }
        .mobile-nav a:hover {
            background: var(--color-bg);
            color: var(--color-primary);
        }
        .mobile-nav a.active {
            background: var(--color-primary-soft);
            color: var(--color-primary);
            font-weight: 600;
        }
        /* Breadcrumb */
        .breadcrumb-bar {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 14px 0;
        }
        .breadcrumb-bar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--color-muted);
            flex-wrap: wrap;
        }
        .breadcrumb-nav a {
            color: var(--color-muted);
            transition: color var(--transition-fast);
        }
        .breadcrumb-nav a:hover {
            color: var(--color-primary);
        }
        .breadcrumb-nav .separator {
            color: var(--color-border);
            user-select: none;
        }
        .breadcrumb-nav .current {
            color: var(--color-ink);
            font-weight: 500;
        }
        .breadcrumb-tag {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            background: var(--color-primary-soft);
            color: var(--color-primary);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            white-space: nowrap;
        }
        /* Article Header */
        .article-header-section {
            background: var(--color-surface);
            padding: var(--space-3xl) 0 var(--space-xl);
            border-bottom: 1px solid var(--color-border);
        }
        .article-header-section .container {
            max-width: 820px;
            margin: 0 auto;
        }
        .article-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--color-ink);
            margin-bottom: var(--space-md);
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 14px;
            color: var(--color-muted);
        }
        .article-meta .article-category {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            background: var(--color-primary-soft);
            color: var(--color-primary);
            border-radius: 4px;
            font-weight: 600;
            font-size: 13px;
        }
        .article-meta .article-date,
        .article-meta .article-views {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .article-meta .meta-dot {
            width: 4px;
            height: 4px;
            background: var(--color-border);
            border-radius: 50%;
        }
        /* Article Content */
        .article-content-section {
            background: var(--color-surface);
            padding: var(--space-xl) 0 var(--space-3xl);
        }
        .article-content-section .container {
            max-width: 820px;
            margin: 0 auto;
        }
        .article-body {
            font-size: 16px;
            line-height: 1.85;
            color: var(--color-ink);
            max-width: 720px;
            margin: 0 auto;
        }
        .article-body h2 {
            font-size: 24px;
            font-weight: 700;
            margin-top: var(--space-2xl);
            margin-bottom: var(--space-md);
            padding-top: var(--space-md);
            border-top: 1px solid var(--color-border);
            color: var(--color-ink);
        }
        .article-body h3 {
            font-size: 18px;
            font-weight: 600;
            margin-top: var(--space-xl);
            margin-bottom: var(--space-sm);
            color: var(--color-ink);
        }
        .article-body p {
            margin-bottom: var(--space-md);
            line-height: 1.85;
        }
        .article-body ul,
        .article-body ol {
            margin: var(--space-sm) 0 var(--space-md) 1.5em;
            padding-left: 0.5em;
        }
        .article-body li {
            margin-bottom: var(--space-xs);
            line-height: 1.8;
        }
        .article-body blockquote {
            margin: var(--space-lg) 0;
            padding: var(--space-md) var(--space-lg);
            background: var(--color-bg);
            border-left: 4px solid var(--color-primary);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-muted);
            font-style: italic;
        }
        .article-body code {
            background: var(--color-bg);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 14px;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
            color: var(--color-ink);
        }
        .article-body pre {
            background: var(--color-dark-section);
            color: var(--color-dark-text);
            padding: var(--space-lg);
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: var(--space-lg) 0;
            line-height: 1.6;
        }
        .article-body pre code {
            background: transparent;
            padding: 0;
            color: inherit;
            font-size: 14px;
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: var(--space-lg) 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body .img-placeholder {
            background: var(--color-bg);
            border: 1px dashed var(--color-border);
            border-radius: var(--radius-md);
            aspect-ratio: 16/9;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-muted);
            font-size: 14px;
            margin: var(--space-lg) 0;
        }
        .article-empty {
            text-align: center;
            padding: var(--space-4xl) 0;
            color: var(--color-muted);
        }
        .article-empty p {
            font-size: 18px;
            margin-bottom: var(--space-lg);
            color: var(--color-ink);
        }
        /* Related Downloads */
        .related-downloads-section {
            background: var(--color-bg);
            padding: var(--space-3xl) 0;
        }
        .related-downloads-section .container {
            max-width: var(--container-max);
            margin: 0 auto;
        }
        .section-heading {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: var(--space-lg);
            letter-spacing: 0.01em;
        }
        .related-downloads-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .download-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .download-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .download-card .card-badge {
            display: inline-flex;
            align-items: center;
            align-self: flex-start;
            padding: 3px 10px;
            background: var(--color-secondary-soft);
            color: var(--color-secondary-hover);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
        }
        .download-card .card-badge.green {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
        }
        .download-card .card-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-ink);
            margin: 0;
        }
        .download-card .card-version {
            font-size: 13px;
            color: var(--color-muted);
        }
        .download-card .card-desc {
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.6;
            flex-grow: 1;
        }
        .download-card .btn {
            align-self: flex-start;
        }
        /* Pagination */
        .article-pagination-section {
            background: var(--color-surface);
            padding: var(--space-2xl) 0;
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .article-pagination-section .container {
            max-width: var(--container-max);
            margin: 0 auto;
        }
        .pagination-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
        }
        .pagination-item {
            display: block;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .pagination-item:hover {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-md);
            color: var(--color-ink);
        }
        .pagination-item.prev {
            text-align: left;
        }
        .pagination-item.next {
            text-align: right;
        }
        .pagination-label {
            display: block;
            font-size: 13px;
            color: var(--color-muted);
            margin-bottom: var(--space-xs);
        }
        .pagination-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            line-height: 1.5;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }
        /* Related List */
        .related-list-section {
            background: var(--color-bg);
            padding: var(--space-3xl) 0;
        }
        .related-list-section .container {
            max-width: var(--container-max);
            margin: 0 auto;
        }
        .related-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .related-item {
            display: grid;
            grid-template-columns: 1fr auto;
            grid-template-areas: "title time" "summary summary";
            gap: 4px 16px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: var(--space-md) var(--space-lg);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .related-item:hover {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-sm);
            color: var(--color-ink);
        }
        .related-item .related-title {
            grid-area: title;
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            line-height: 1.5;
        }
        .related-item .related-time {
            grid-area: time;
            font-size: 13px;
            color: var(--color-muted);
            white-space: nowrap;
            align-self: center;
        }
        .related-item .related-summary {
            grid-area: summary;
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.6;
        }
        /* Bottom CTA */
        .article-bottom-section {
            background: var(--color-dark-section);
            padding: var(--space-3xl) 0;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            margin-top: var(--space-xl);
        }
        .article-bottom-section .container {
            max-width: var(--container-max);
            margin: 0 auto;
        }
        .bottom-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-2xl);
            align-items: center;
        }
        .back-card {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
            align-items: flex-start;
        }
        .back-card .btn {
            font-size: 16px;
        }
        .info-card {
            background: var(--color-dark-card);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .info-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--space-sm);
        }
        .info-card p {
            font-size: 14px;
            color: var(--color-dark-text);
            line-height: 1.7;
            margin-bottom: 0;
        }
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            line-height: 1.4;
            transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
            border: 1px solid transparent;
            min-height: 40px;
            text-decoration: none;
        }
        .btn:active {
            transform: translateY(1px);
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
            color: #fff;
            box-shadow: 0 4px 12px rgba(0, 200, 150, 0.3);
        }
        .btn-secondary {
            background: var(--color-surface);
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .btn-secondary:hover {
            background: var(--color-primary-soft);
            border-color: var(--color-primary);
            color: var(--color-primary-hover);
        }
        .btn-danger {
            background: var(--color-danger-soft);
            color: var(--color-danger);
            border-color: transparent;
        }
        .btn-danger:hover {
            background: #f5d0d0;
            color: #b83232;
        }
        .btn-dark {
            background: var(--color-dark-card);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.15);
        }
        .btn-dark:hover {
            background: #2f3a43;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.25);
        }
        /* Footer */
        .site-footer {
            background: var(--color-dark-section);
            color: var(--color-dark-text);
            padding: var(--space-3xl) 0 0;
            margin-top: 0;
        }
        .site-footer .container {
            max-width: var(--container-max);
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: var(--space-2xl);
            padding-bottom: var(--space-2xl);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.7;
            margin-top: var(--space-md);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--space-md);
            letter-spacing: 0.02em;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--color-muted);
            padding: 4px 0;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--color-primary);
        }
        .footer-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .footer-tags span {
            display: inline-flex;
            padding: 4px 10px;
            background: var(--color-dark-card);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 4px;
            font-size: 12px;
            color: var(--color-muted);
            white-space: nowrap;
        }
        .footer-bottom {
            text-align: center;
            padding: var(--space-lg) 0;
            font-size: 13px;
            color: var(--color-muted);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        /* Responsive */
        @media (max-width: 1023px) {
            .main-nav {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .related-downloads-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-xl);
            }
            .article-title {
                font-size: 28px;
            }
        }
        @media (max-width: 767px) {
            .site-header {
                height: 60px;
            }
            .logo-text {
                font-size: 14px;
                max-width: 220px;
            }
            .article-header-section {
                padding: var(--space-xl) 0 var(--space-lg);
            }
            .article-title {
                font-size: 22px;
                line-height: 1.45;
            }
            .article-meta {
                gap: 10px;
                font-size: 13px;
            }
            .article-body {
                font-size: 15px;
                line-height: 1.8;
            }
            .article-body h2 {
                font-size: 20px;
            }
            .article-body h3 {
                font-size: 17px;
            }
            .related-downloads-grid {
                grid-template-columns: 1fr;
                gap: var(--space-md);
            }
            .pagination-grid {
                grid-template-columns: 1fr;
                gap: var(--space-md);
            }
            .bottom-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
            .related-item {
                grid-template-columns: 1fr;
                grid-template-areas: "title" "summary" "time";
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
            .article-bottom-section {
                border-radius: var(--radius-md) var(--radius-md) 0 0;
                margin-top: var(--space-lg);
                padding: var(--space-2xl) 0;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .site-header .container {
                padding: 0 16px;
            }
            .logo-mark {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
            .logo-text {
                font-size: 13px;
                max-width: 170px;
            }
            .nav-toggle {
                width: 40px;
                height: 40px;
            }
            .article-title {
                font-size: 20px;
            }
            .article-body {
                font-size: 14px;
            }
            .related-item .related-title {
                font-size: 14px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
        }

/* roulang page: category3 */
:root {
            --color-bg: #F4F6F8;
            --color-surface: #FFFFFF;
            --color-ink: #171A1F;
            --color-muted: #5F6B7A;
            --color-primary: #00C896;
            --color-primary-hover: #00A87D;
            --color-primary-soft: #E6F9F2;
            --color-secondary: #FF9F43;
            --color-secondary-hover: #E8892E;
            --color-secondary-soft: #FFF3E6;
            --color-danger: #D64545;
            --color-danger-soft: #FBE7E7;
            --color-border: #E2E6EB;
            --color-dark-section: #1F252B;
            --color-dark-card: #262E35;
            --color-dark-text: #E8ECF0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --shadow-sm: 0 2px 8px rgba(23, 26, 31, 0.05);
            --shadow-md: 0 4px 16px rgba(23, 26, 31, 0.06);
            --shadow-lg: 0 8px 24px rgba(23, 26, 31, 0.12);
            --space-xs: 8px;
            --space-sm: 12px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 40px;
            --space-3xl: 56px;
            --space-4xl: 72px;
            --container-max: 1200px;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-ink);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            color: inherit;
            background: none;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
        }
        button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        /* Header / Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: 68px;
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(23, 26, 31, 0.04);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        .logo {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-ink);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo-text {
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 340px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            border-radius: 6px;
            white-space: nowrap;
            transition: color var(--transition-fast), background var(--transition-fast);
        }
        .main-nav a:hover {
            color: var(--color-ink);
            background: var(--color-bg);
        }
        .main-nav a.active {
            color: var(--color-primary);
            background: var(--color-primary-soft);
            font-weight: 600;
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            color: var(--color-ink);
            flex-direction: column;
            gap: 5px;
            transition: background var(--transition-fast);
        }
        .nav-toggle:hover {
            background: var(--color-bg);
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--color-ink);
            border-radius: 2px;
            transition: transform var(--transition-base), opacity var(--transition-base);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        /* Category H1 Strip */
        .category-h1-strip {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: var(--space-xl) 0;
        }
        .category-h1-strip .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--space-md);
        }
        .breadcrumb {
            font-size: 13px;
            color: var(--color-muted);
            display: flex;
            align-items: center;
            gap: var(--space-xs);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--color-primary);
        }
        .breadcrumb a:hover {
            color: var(--color-primary-hover);
        }
        .breadcrumb .sep {
            color: var(--color-border);
        }
        .category-h1-strip h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--color-ink);
            margin: var(--space-sm) 0 0;
            letter-spacing: 0.01em;
        }
        .category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 20px;
            white-space: nowrap;
        }
        .category-badge .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--color-primary);
            display: inline-block;
        }
        /* Section Base */
        .section {
            padding: var(--space-3xl) 0;
        }
        .section-white {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .section-gray {
            background: var(--color-bg);
        }
        .section-dark {
            background: var(--color-dark-section);
            color: var(--color-dark-text);
        }
        .section-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: var(--space-sm);
            letter-spacing: 0.01em;
        }
        .section-dark .section-title {
            color: #fff;
        }
        .section-desc {
            font-size: 15px;
            color: var(--color-muted);
            line-height: 1.8;
            margin-bottom: var(--space-xl);
            max-width: 720px;
        }
        .section-dark .section-desc {
            color: #A0ABB8;
        }
        /* Tool Grid */
        .tool-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .tool-grid-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            text-align: left;
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .tool-grid-item:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .tool-grid-icon {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--color-primary-soft);
            border-radius: var(--radius-sm);
            margin-bottom: var(--space-md);
            color: var(--color-primary-hover);
            font-size: 20px;
        }
        .tool-grid-item h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: var(--space-xs);
        }
        .tool-grid-item p {
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.6;
            margin: 0 0 var(--space-md);
        }
        .tool-grid-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .tool-grid-link:hover {
            color: var(--color-primary-hover);
        }
        .tool-grid-link .arrow {
            transition: transform var(--transition-fast);
        }
        .tool-grid-link:hover .arrow {
            transform: translateX(4px);
        }
        /* Tool Download List */
        .tool-download-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .tool-download-row {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: var(--space-md) var(--space-lg);
            flex-wrap: wrap;
            transition: box-shadow var(--transition-base);
        }
        .tool-download-row:hover {
            box-shadow: var(--shadow-md);
        }
        .tool-download-info {
            flex: 1 1 260px;
            min-width: 240px;
        }
        .tool-download-info h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            margin: 0 0 4px;
        }
        .tool-download-info p {
            font-size: 13px;
            color: var(--color-muted);
            margin: 0;
        }
        .tool-download-meta {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            flex-wrap: wrap;
            font-size: 12px;
            color: var(--color-muted);
            flex: 0 1 auto;
            white-space: nowrap;
        }
        .tool-download-meta .badge-version {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 500;
            font-size: 12px;
        }
        .tool-download-meta .badge-date {
            color: var(--color-muted);
        }
        .tool-download-meta .badge-size {
            color: var(--color-secondary-hover);
            font-weight: 500;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 10px 18px;
            font-size: 14px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
            white-space: nowrap;
            min-height: 40px;
            border: 1px solid transparent;
        }
        .btn:active {
            transform: translateY(1px);
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
            color: #fff;
            box-shadow: var(--shadow-md);
        }
        .btn-outline {
            background: var(--color-surface);
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .btn-outline:hover {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
        }
        .btn-danger-soft {
            background: var(--color-danger-soft);
            color: var(--color-danger);
            border-color: var(--color-danger);
        }
        .btn-danger-soft:hover {
            background: var(--color-danger);
            color: #fff;
            border-color: var(--color-danger);
        }
        .btn-sm {
            padding: 6px 12px;
            font-size: 13px;
            min-height: 32px;
        }
        .btn-lg {
            padding: 12px 24px;
            font-size: 15px;
            min-height: 48px;
        }
        /* Steps */
        .steps-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
        }
        .step-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            position: relative;
            transition: box-shadow var(--transition-base);
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
        }
        .step-number {
            font-size: 32px;
            font-weight: 800;
            color: var(--color-primary);
            margin-bottom: var(--space-sm);
            line-height: 1;
        }
        .step-item h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: var(--space-xs);
        }
        .step-item p {
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.6;
            margin: 0;
        }
        /* Safety Notice */
        .safety-notice {
            background: var(--color-danger-soft);
            border: 1px solid var(--color-danger);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
        }
        .safety-notice h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-danger);
            margin-bottom: var(--space-sm);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .safety-notice h3 .icon-alert {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 24px;
            height: 24px;
            background: var(--color-danger);
            color: #fff;
            border-radius: 50%;
            font-size: 14px;
            font-weight: 700;
        }
        .safety-notice p {
            font-size: 14px;
            color: var(--color-ink);
            line-height: 1.8;
            margin: 0;
        }
        /* Update Log */
        .update-log-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .update-log-item {
            display: flex;
            align-items: baseline;
            gap: var(--space-md);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: var(--space-md) var(--space-lg);
            flex-wrap: wrap;
            transition: box-shadow var(--transition-base);
        }
        .update-log-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .update-log-date {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-secondary-hover);
            white-space: nowrap;
            min-width: 100px;
        }
        .update-log-version {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-primary);
            white-space: nowrap;
        }
        .update-log-desc {
            font-size: 14px;
            color: var(--color-ink);
            flex: 1 1 200px;
        }
        /* Support Cards */
        .support-cards {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
        }
        .support-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            text-align: left;
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .support-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .support-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: var(--space-xs);
        }
        .support-card p {
            font-size: 14px;
            color: var(--color-muted);
            margin: 0 0 var(--space-md);
            line-height: 1.7;
        }
        /* Back Button */
        .back-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            padding: var(--space-xl) 0;
        }
        .back-section .container {
            display: flex;
            justify-content: center;
        }
        /* Footer */
        .site-footer {
            background: var(--color-dark-section);
            color: var(--color-dark-text);
            padding: var(--space-3xl) 0 var(--space-lg);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: var(--space-xl);
            margin-bottom: var(--space-xl);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: var(--space-sm);
        }
        .footer-brand p {
            font-size: 13px;
            color: #A0ABB8;
            line-height: 1.7;
            margin: 0;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: var(--space-md);
        }
        .footer-col a {
            display: block;
            font-size: 13px;
            color: #A0ABB8;
            margin-bottom: var(--space-xs);
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--color-primary);
        }
        .footer-tags {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-xs);
        }
        .footer-tags span {
            font-size: 12px;
            background: var(--color-dark-card);
            color: #A0ABB8;
            padding: 4px 10px;
            border-radius: 4px;
            border: 1px solid rgba(255,255,255,0.06);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: var(--space-lg);
            font-size: 12px;
            color: #7D8794;
            text-align: center;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .tool-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-flow {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                border-bottom: 1px solid var(--color-border);
                flex-direction: column;
                align-items: stretch;
                padding: var(--space-sm) 0;
                gap: 2px;
                box-shadow: var(--shadow-md);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 20px;
                border-radius: 0;
                font-size: 15px;
                justify-content: flex-start;
            }
            .category-h1-strip h1 {
                font-size: 22px;
            }
            .section {
                padding: var(--space-2xl) 0;
            }
            .section-title {
                font-size: 20px;
            }
            .tool-grid {
                grid-template-columns: 1fr;
            }
            .steps-flow {
                grid-template-columns: 1fr;
            }
            .support-cards {
                grid-template-columns: 1fr;
            }
            .tool-download-row {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--space-sm);
                padding: var(--space-md);
            }
            .tool-download-info {
                min-width: 100%;
            }
            .tool-download-meta {
                white-space: normal;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
        }
        @media (max-width: 520px) {
            .category-h1-strip .container {
                flex-direction: column;
                align-items: flex-start;
            }
            .category-h1-strip h1 {
                font-size: 20px;
            }
            .section-title {
                font-size: 18px;
            }
            .btn-lg {
                padding: 10px 18px;
                font-size: 14px;
            }
            .tool-download-row {
                padding: var(--space-sm);
            }
            .tool-download-info h3 {
                font-size: 15px;
            }
        }

/* roulang page: category2 */
:root {
            --color-bg: #F4F6F8;
            --color-surface: #FFFFFF;
            --color-ink: #171A1F;
            --color-muted: #5F6B7A;
            --color-primary: #00C896;
            --color-primary-hover: #00A87D;
            --color-primary-soft: #E6F9F2;
            --color-secondary: #FF9F43;
            --color-secondary-hover: #E8892E;
            --color-secondary-soft: #FFF3E6;
            --color-danger: #D64545;
            --color-danger-soft: #FBE7E7;
            --color-border: #E2E6EB;
            --color-dark-section: #1F252B;
            --color-dark-card: #262E35;
            --color-dark-text: #E8ECF0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --shadow-sm: 0 2px 8px rgba(23, 26, 31, 0.05);
            --shadow-md: 0 4px 16px rgba(23, 26, 31, 0.06);
            --shadow-lg: 0 8px 24px rgba(23, 26, 31, 0.12);
            --space-xs: 8px;
            --space-sm: 12px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 40px;
            --space-3xl: 56px;
            --space-4xl: 72px;
            --container-max: 1200px;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-ink);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            color: inherit;
            background: none;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
        }
        button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        /* Header / Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: 68px;
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(23, 26, 31, 0.04);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        .logo {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-ink);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo-text {
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 340px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            border-radius: 6px;
            white-space: nowrap;
            transition: color var(--transition-fast), background var(--transition-fast);
        }
        .main-nav a:hover {
            color: var(--color-ink);
            background: var(--color-bg);
        }
        .main-nav a.active {
            color: var(--color-primary);
            background: var(--color-primary-soft);
            font-weight: 600;
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            color: var(--color-ink);
            flex-direction: column;
            gap: 5px;
            transition: background var(--transition-fast);
        }
        .nav-toggle:hover {
            background: var(--color-bg);
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--color-ink);
            border-radius: 2px;
            transition: transform var(--transition-base), opacity var(--transition-base);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
            min-height: 44px;
            gap: 8px;
            line-height: 1.4;
        }
        .btn:active {
            transform: translateY(1px);
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            border: 1px solid var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
            color: #fff;
        }
        .btn-outline {
            background: var(--color-surface);
            color: var(--color-primary);
            border: 1px solid var(--color-primary);
        }
        .btn-outline:hover {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
            border-color: var(--color-primary);
        }
        .btn-danger {
            background: var(--color-danger-soft);
            color: var(--color-danger);
            border: 1px solid var(--color-danger);
        }
        .btn-danger:hover {
            background: var(--color-danger);
            color: #fff;
            border-color: var(--color-danger);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 13px;
            min-height: 36px;
        }
        .btn-lg {
            padding: 12px 30px;
            font-size: 16px;
            min-height: 52px;
        }
        /* Badges */
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 20px;
            white-space: nowrap;
            line-height: 1.5;
        }
        .badge-primary {
            background: var(--color-primary-soft);
            color: var(--color-primary-hover);
        }
        .badge-secondary {
            background: var(--color-secondary-soft);
            color: var(--color-secondary-hover);
        }
        .badge-danger {
            background: var(--color-danger-soft);
            color: var(--color-danger);
        }
        .badge-outline {
            background: var(--color-surface);
            color: var(--color-muted);
            border: 1px solid var(--color-border);
        }
        /* Sections */
        .section {
            padding: var(--space-3xl) 0;
            background: var(--color-surface);
        }
        .section-alt {
            padding: var(--space-3xl) 0;
            background: var(--color-bg);
        }
        .section-dark {
            padding: var(--space-4xl) 0;
            background: var(--color-dark-section);
            color: var(--color-dark-text);
        }
        .section-header {
            margin-bottom: var(--space-2xl);
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--space-md);
        }
        .section-header h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 0 0 8px;
            color: var(--color-ink);
            letter-spacing: 0.01em;
        }
        .section-header p {
            margin: 0;
            color: var(--color-muted);
            font-size: 15px;
        }
        .section-dark .section-header h2 {
            color: var(--color-dark-text);
        }
        .section-dark .section-header p {
            color: #9AA5B1;
        }
        /* Category Hero */
        .category-hero {
            padding: var(--space-2xl) 0 var(--space-2xl);
            background: linear-gradient(135deg, #F0F4F7 0%, #E6F9F2 100%);
            border-bottom: 1px solid var(--color-border);
        }
        .category-hero .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--space-lg);
        }
        .breadcrumb-custom {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--color-muted);
            margin-bottom: var(--space-sm);
        }
        .breadcrumb-custom a {
            color: var(--color-primary);
        }
        .breadcrumb-custom a:hover {
            color: var(--color-primary-hover);
        }
        .breadcrumb-custom .sep {
            color: #B0B6C0;
        }
        .breadcrumb-custom .current {
            color: var(--color-ink);
            font-weight: 600;
        }
        .category-hero h1 {
            font-size: 32px;
            font-weight: 800;
            margin: 0;
            letter-spacing: 0.01em;
            color: var(--color-ink);
            line-height: 1.4;
        }
        .category-hero .hero-meta {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
        }
        /* Version Matrix */
        .version-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .version-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-xl);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .version-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .version-card .vc-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: var(--space-sm);
            flex-wrap: wrap;
            gap: 8px;
        }
        .version-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 0;
            color: var(--color-ink);
        }
        .version-card .vc-desc {
            font-size: 14px;
            color: var(--color-muted);
            margin-bottom: var(--space-md);
            line-height: 1.6;
        }
        .version-card .vc-features {
            list-style: none;
            padding: 0;
            margin: 0 0 var(--space-lg);
            flex: 1;
        }
        .version-card .vc-features li {
            font-size: 13px;
            color: var(--color-muted);
            padding: 4px 0 4px 20px;
            position: relative;
        }
        .version-card .vc-features li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--color-primary);
            font-weight: 700;
        }
        .version-card .btn {
            align-self: flex-start;
        }
        /* Upgrade Steps */
        .upgrade-steps {
            display: flex;
            flex-direction: column;
            gap: var(--space-2xl);
        }
        .step-item {
            display: flex;
            align-items: stretch;
            gap: var(--space-lg);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base);
            flex-wrap: wrap;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
        }
        .step-item .step-img {
            flex: 0 0 280px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            min-height: 160px;
            background: var(--color-bg);
        }
        .step-item .step-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .step-item .step-body {
            flex: 1;
            min-width: 260px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .step-item .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 50%;
            font-weight: 800;
            font-size: 16px;
            margin-bottom: var(--space-sm);
            flex-shrink: 0;
        }
        .step-item h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 0 0 6px;
            color: var(--color-ink);
        }
        .step-item p {
            margin: 0;
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.7;
        }
        .step-item.reverse {
            flex-direction: row-reverse;
        }
        /* Tool Entry Cards */
        .tool-entry-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-lg);
        }
        .tool-entry-card {
            display: flex;
            align-items: center;
            gap: var(--space-lg);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base), transform var(--transition-base);
        }
        .tool-entry-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .tool-entry-card .tool-img {
            flex: 0 0 120px;
            height: 90px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: var(--color-bg);
        }
        .tool-entry-card .tool-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .tool-entry-card .tool-info h3 {
            font-size: 17px;
            font-weight: 700;
            margin: 0 0 4px;
            color: var(--color-ink);
        }
        .tool-entry-card .tool-info p {
            margin: 0;
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.6;
        }
        /* Download List */
        .download-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }
        .download-card {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-lg);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base);
            flex-wrap: wrap;
        }
        .download-card:hover {
            box-shadow: var(--shadow-md);
        }
        .download-card .dc-main {
            flex: 1;
            min-width: 240px;
        }
        .download-card .dc-main h3 {
            font-size: 16px;
            font-weight: 700;
            margin: 6px 0 4px;
            color: var(--color-ink);
            line-height: 1.4;
        }
        .download-card .dc-main p {
            font-size: 13px;
            color: var(--color-muted);
            margin: 0 0 6px;
            line-height: 1.6;
        }
        .download-card .dc-meta {
            font-size: 12px;
            color: #9AA5B1;
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .download-card .btn {
            flex-shrink: 0;
        }
        .empty-state {
            background: var(--color-surface);
            border: 2px dashed var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-2xl);
            text-align: center;
            color: var(--color-muted);
            font-size: 15px;
        }
        /* Safety Note */
        .safety-note {
            background: var(--color-danger-soft);
            border: 1px solid #F0B8B8;
            border-radius: var(--radius-md);
            padding: var(--space-xl);
            display: flex;
            align-items: flex-start;
            gap: var(--space-md);
        }
        .safety-note .sn-icon {
            width: 40px;
            height: 40px;
            background: var(--color-danger);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            flex-shrink: 0;
        }
        .safety-note h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-danger);
            margin: 0 0 6px;
        }
        .safety-note p {
            margin: 0;
            font-size: 14px;
            color: #8C3D3D;
            line-height: 1.7;
        }
        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition-fast);
        }
        .faq-item.active {
            border-color: var(--color-primary);
        }
        .faq-item .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-md) var(--space-lg);
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            gap: var(--space-md);
            transition: background var(--transition-fast);
        }
        .faq-item .faq-question:hover {
            background: var(--color-bg);
        }
        .faq-item .faq-question .faq-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 24px;
            height: 24px;
            background: var(--color-primary-soft);
            color: var(--color-primary);
            border-radius: 50%;
            font-size: 12px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .faq-item .faq-question .faq-icon {
            font-size: 18px;
            color: var(--color-muted);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question .faq-icon {
            transform: rotate(45deg);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
            padding: 0 var(--space-lg);
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
        }
        .faq-item .faq-answer p {
            padding: 0 0 var(--space-md);
            margin: 0;
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.7;
        }
        /* CTA Section */
        .cta-section {
            padding: var(--space-4xl) 0;
            background: var(--color-dark-section);
            text-align: center;
            color: var(--color-dark-text);
        }
        .cta-section h2 {
            font-size: 28px;
            font-weight: 800;
            margin: 0 0 var(--space-sm);
            line-height: 1.4;
            color: #fff;
        }
        .cta-section p {
            font-size: 15px;
            color: #9AA5B1;
            margin: 0 0 var(--space-xl);
        }
        .cta-section .btn-group {
            display: flex;
            gap: var(--space-md);
            justify-content: center;
            flex-wrap: wrap;
        }
        /* Footer */
        .site-footer {
            background: var(--color-dark-section);
            color: var(--color-dark-text);
            padding: var(--space-3xl) 0 var(--space-lg);
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.4fr;
            gap: var(--space-2xl);
            margin-bottom: var(--space-2xl);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: var(--space-md);
        }
        .footer-brand p {
            font-size: 13px;
            color: #9AA5B1;
            line-height: 1.7;
            margin: 0;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 var(--space-md);
        }
        .footer-col a {
            display: block;
            font-size: 13px;
            color: #9AA5B1;
            padding: 4px 0;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--color-primary);
        }
        .footer-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .footer-tags span {
            font-size: 12px;
            padding: 4px 10px;
            background: var(--color-dark-card);
            color: #9AA5B1;
            border-radius: 4px;
            border: 1px solid rgba(255,255,255,0.08);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: var(--space-md);
            font-size: 12px;
            color: #6B7683;
            text-align: center;
            line-height: 1.7;
        }
        /* Responsive */
        @media (max-width: 1023px) {
            .version-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-xl);
            }
            .step-item .step-img {
                flex: 0 0 220px;
            }
        }
        @media (max-width: 767px) {
            .site-header {
                height: 60px;
            }
            .site-header .container {
                padding: 0 12px;
            }
            .logo-text {
                max-width: 200px;
                font-size: 15px;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 60px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                border-bottom: 1px solid var(--color-border);
                padding: var(--space-md);
                gap: 2px;
                box-shadow: var(--shadow-md);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 14px;
                font-size: 15px;
                border-radius: 6px;
            }
            .nav-toggle {
                display: flex;
            }
            .section, .section-alt {
                padding: var(--space-2xl) 0;
            }
            .section-header {
                flex-direction: column;
                align-items: flex-start;
                margin-bottom: var(--space-xl);
            }
            .section-header h2 {
                font-size: 20px;
            }
            .version-grid {
                grid-template-columns: 1fr;
            }
            .step-item {
                flex-direction: column !important;
                padding: var(--space-md);
            }
            .step-item .step-img {
                flex: 0 0 auto;
                width: 100%;
                aspect-ratio: 16/9;
                min-height: auto;
            }
            .tool-entry-grid {
                grid-template-columns: 1fr;
            }
            .download-card {
                flex-direction: column;
                align-items: flex-start;
            }
            .download-card .btn {
                width: 100%;
            }
            .category-hero {
                padding: var(--space-xl) 0;
            }
            .category-hero h1 {
                font-size: 24px;
            }
            .category-hero .container {
                flex-direction: column;
                align-items: flex-start;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
            .cta-section h2 {
                font-size: 22px;
            }
            .btn-lg {
                padding: 12px 20px;
                font-size: 15px;
                min-height: 46px;
            }
            .tool-entry-card {
                flex-direction: column;
                gap: var(--space-sm);
            }
            .tool-entry-card .tool-img {
                flex: 0 0 auto;
                width: 100%;
                height: 140px;
            }
        }
        @media (max-width: 520px) {
            .logo-text {
                max-width: 160px;
                font-size: 13px;
            }
            .logo-mark {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
            .category-hero h1 {
                font-size: 20px;
            }
            .badge {
                font-size: 10px;
                padding: 3px 8px;
            }
            .version-card {
                padding: var(--space-lg);
            }
            .download-card {
                padding: var(--space-md);
            }
            .btn {
                padding: 8px 16px;
                font-size: 14px;
                min-height: 38px;
            }
        }