/* roulang page: index */
:root {
            --cherry: #C93636;
            --cherry-hover: #A92B2B;
            --cherry-light: #FBEAEA;
            --ink: #22262E;
            --ink-soft: #5D6673;
            --ink-mute: #8A94A3;
            --bg: #F5F6F8;
            --card: #FFFFFF;
            --line: #E5E8EE;
            --line-soft: #EDEFF4;
            --red-win: #E23D3D;
            --green-win: #3DAA5B;
            --blue-win: #2F6FED;
            --yellow-win: #F0B429;
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-pill: 999px;
            --shadow-card: 0 10px 28px rgba(26,28,34,0.06);
            --shadow-hover: 0 16px 40px rgba(201,54,54,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
            --font-mono: SFMono-Regular, Consolas, monospace;
            --container: 1200px;
            --nav-height: 64px;
            --section-pad-desktop: 72px;
            --section-pad-mobile: 44px;
            --transition: 0.22s ease;
        }

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

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

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

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

        a {
            color: var(--cherry);
            text-decoration: underline;
            transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
        }
        a:hover {
            color: var(--cherry-hover);
        }
        a:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
            border-radius: 4px;
        }

        button, input {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible, input:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
        }

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

        /* ===== NAV ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: #fff;
            border-bottom: 1px solid var(--line);
            border-top: 3px solid var(--cherry);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }
        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--ink);
            text-decoration: none;
            white-space: nowrap;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--cherry);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
        }
        .logo:hover {
            color: var(--cherry);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }
        .main-nav a {
            color: var(--ink);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: color var(--transition), background var(--transition);
        }
        .main-nav a:hover {
            color: var(--cherry);
            background: var(--cherry-light);
        }
        .main-nav a.active {
            color: var(--cherry);
            font-weight: 700;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            background: var(--cherry);
            border-radius: 2px;
        }
        .nav-cta {
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: background var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-cta:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .nav-cta:active {
            transform: translateY(1px);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            border-radius: 8px;
        }
        .nav-toggle span {
            width: 26px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: all var(--transition);
            display: block;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== SECTIONS ===== */
        main {
            display: block;
        }
        section {
            padding: var(--section-pad-desktop) 0;
        }
        .section-light {
            background: #fff;
        }
        .section-gray {
            background: var(--bg);
        }
        .section-cherry-soft {
            background: var(--cherry-light);
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--cherry-light);
            color: var(--cherry);
            font-size: 13px;
            font-weight: 700;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 12px;
            letter-spacing: 0.4px;
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.35;
            margin-bottom: 10px;
            letter-spacing: 0.3px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--ink-soft);
            line-height: 1.8;
            max-width: 720px;
            margin-bottom: 28px;
        }
        .section-head {
            margin-bottom: 36px;
        }

        /* ===== BUTTONS ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 20px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--cherry);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: none;
        }
        .btn-outline {
            background: transparent;
            color: var(--ink);
            border-color: var(--ink);
        }
        .btn-outline:hover {
            background: var(--cherry-light);
            border-color: var(--cherry);
            color: var(--cherry);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(1px);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
        }
        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }

        /* ===== HERO ===== */
        .hero {
            padding: 56px 0 72px;
            background: #fff;
            border-bottom: 1px solid var(--line-soft);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            min-height: 420px;
        }
        .hero-content .section-label {
            margin-bottom: 16px;
        }
        .hero-title {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--ink);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .hero-sub {
            font-size: 17px;
            color: var(--ink-soft);
            line-height: 1.8;
            margin-bottom: 28px;
            max-width: 520px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 24px;
        }
        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 600;
            background: #fff;
            border: 1px solid var(--line);
            color: var(--ink-soft);
            text-decoration: none;
            transition: all var(--transition);
        }
        .hero-badge:hover {
            border-color: var(--cherry);
            color: var(--cherry);
            background: var(--cherry-light);
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
        }
        .dot-win12 { background: var(--red-win); }
        .dot-win10-pro { background: var(--blue-win); }
        .dot-win10-ltsc { background: var(--green-win); }

        .hero-visual {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            background: #EFF1F5;
            min-height: 420px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 420px;
        }
        .hero-visual .hero-corner-badge {
            position: absolute;
            bottom: 16px;
            right: 16px;
            background: rgba(255,255,255,0.95);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            font-size: 12px;
            font-weight: 600;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 6px;
            border: 1px solid var(--line);
        }

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

        .card {
            background: var(--card);
            border-radius: var(--radius-md);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            padding: 22px;
            transition: all var(--transition);
            text-decoration: none;
            display: flex;
            flex-direction: column;
            color: var(--ink);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--cherry);
        }
        .card .card-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 8px;
            line-height: 1.4;
            transition: color var(--transition);
        }
        .card:hover .card-title {
            color: var(--cherry);
        }
        .card .card-desc {
            font-size: 14px;
            color: var(--ink-soft);
            line-height: 1.7;
            flex: 1;
        }
        .card-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: var(--cherry-light);
            color: var(--cherry);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 14px;
            font-size: 20px;
            flex-shrink: 0;
        }
        .card-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 14px;
            font-size: 12px;
            color: var(--ink-mute);
            align-items: center;
        }
        .card-tag {
            display: inline-flex;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            font-size: 12px;
            font-weight: 600;
            background: var(--cherry-light);
            color: var(--cherry);
        }
        .card-time {
            font-size: 12px;
            color: var(--ink-mute);
        }

        /* ===== VERSION COMPARE ===== */
        .compare-grid {
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 40px;
            align-items: start;
        }
        .compare-rows {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .compare-row {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            transition: all var(--transition);
        }
        .compare-row:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-card);
        }
        .compare-row .ver-name {
            font-weight: 700;
            font-size: 16px;
            min-width: 140px;
            color: var(--ink);
        }
        .compare-row .ver-detail {
            font-size: 14px;
            color: var(--ink-soft);
            flex: 1;
            min-width: 180px;
        }
        .compare-row .ver-date {
            font-size: 13px;
            color: var(--ink-mute);
            white-space: nowrap;
            font-family: var(--font-mono);
        }

        /* ===== CMS NEWS ===== */
        .news-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 28px;
            align-items: start;
        }
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .news-item {
            display: flex;
            gap: 18px;
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 18px;
            text-decoration: none;
            color: var(--ink);
            transition: all var(--transition);
        }
        .news-item:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-card);
            transform: translateY(-2px);
        }
        .news-item .news-thumb {
            width: 120px;
            height: 80px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
            background: #EFF1F5;
        }
        .news-item .news-body {
            flex: 1;
        }
        .news-item .news-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 6px;
            line-height: 1.45;
        }
        .news-item .news-summary {
            font-size: 14px;
            color: var(--ink-soft);
            line-height: 1.65;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-sidebar {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .sidebar-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 20px;
        }
        .sidebar-card h3 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--ink);
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag-cloud a {
            display: inline-flex;
            padding: 5px 12px;
            font-size: 12px;
            font-weight: 500;
            border-radius: var(--radius-pill);
            background: var(--bg);
            color: var(--ink-soft);
            text-decoration: none;
            transition: all var(--transition);
        }
        .tag-cloud a:hover {
            background: var(--cherry-light);
            color: var(--cherry);
        }
        .archive-placeholder {
            font-size: 13px;
            color: var(--ink-mute);
            line-height: 1.7;
        }

        /* ===== TUTORIALS ===== */
        .tutorial-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 28px;
            align-items: start;
        }
        .tutorial-main-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .tutorial-card {
            display: flex;
            gap: 18px;
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 18px;
            text-decoration: none;
            color: var(--ink);
            transition: all var(--transition);
        }
        .tutorial-card:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-card);
            transform: translateY(-2px);
        }
        .tutorial-card .tut-thumb {
            width: 140px;
            height: 90px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
            background: #EFF1F5;
        }
        .tutorial-card .tut-body {
            flex: 1;
        }
        .tutorial-card .tut-step {
            font-size: 12px;
            font-weight: 700;
            color: var(--cherry);
            margin-bottom: 5px;
            letter-spacing: 0.5px;
        }
        .tutorial-card .tut-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 6px;
        }
        .tutorial-card .tut-summary {
            font-size: 14px;
            color: var(--ink-soft);
            line-height: 1.65;
        }
        .tutorial-card .tut-meta {
            font-size: 12px;
            color: var(--ink-mute);
            margin-top: 8px;
            display: flex;
            gap: 12px;
        }
        .step-index {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 22px;
        }
        .step-index h3 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--ink);
        }
        .step-index ol {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .step-index ol li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--ink-soft);
            padding: 10px 14px;
            border-radius: 8px;
            background: var(--bg);
            transition: all var(--transition);
        }
        .step-index ol li:hover {
            background: var(--cherry-light);
            color: var(--cherry);
        }
        .step-index .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: var(--cherry);
            color: #fff;
            font-size: 13px;
            font-weight: 700;
            flex-shrink: 0;
        }

        /* ===== DRIVER QUERY ===== */
        .driver-query-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: start;
        }
        .driver-form {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 28px;
        }
        .driver-form label {
            font-size: 14px;
            font-weight: 700;
            color: var(--ink);
            display: block;
            margin-bottom: 8px;
        }
        .driver-form .input-row {
            display: flex;
            gap: 10px;
            margin-bottom: 16px;
        }
        .driver-form input[type="text"] {
            flex: 1;
            height: 44px;
            padding: 0 16px;
            border: 1px solid #D8DDE5;
            border-radius: var(--radius-sm);
            font-size: 15px;
            color: var(--ink);
            background: #fff;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .driver-form input[type="text"]:focus {
            border-color: var(--cherry);
            box-shadow: 0 0 0 3px rgba(201,54,54,0.14);
            outline: none;
        }
        .brand-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .brand-tags span {
            display: inline-flex;
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 500;
            border-radius: var(--radius-pill);
            background: var(--bg);
            color: var(--ink-soft);
            border: 1px solid var(--line-soft);
        }
        .driver-result {
            background: var(--card);
            border: 1px dashed var(--line);
            border-radius: var(--radius-md);
            padding: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 200px;
            font-size: 14px;
            color: var(--ink-mute);
            text-align: center;
        }

        /* ===== USB GUIDE ===== */
        .steps-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .step-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            text-align: center;
            text-decoration: none;
            color: var(--ink);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .step-card:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-card);
            transform: translateY(-4px);
        }
        .step-card .step-circle {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--cherry);
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 14px;
        }
        .step-card .step-img {
            width: 100%;
            height: 100px;
            border-radius: 8px;
            background: #EFF1F5;
            margin-bottom: 12px;
            border: 1px solid var(--line-soft);
            overflow: hidden;
        }
        .step-card .step-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .step-card h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--ink);
        }
        .step-card p {
            font-size: 13px;
            color: var(--ink-soft);
            line-height: 1.6;
        }

        /* ===== ACTIVATION ===== */
        .activation-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .activation-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin: 20px 0;
        }
        .activation-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--ink-soft);
            line-height: 1.6;
        }
        .activation-list .check-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--green-win);
            color: #fff;
            font-size: 12px;
            flex-shrink: 0;
            margin-top: 3px;
        }
        .activation-visual {
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            background: #EFF1F5;
            min-height: 280px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .activation-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 280px;
        }

        /* ===== UPGRADE ===== */
        .upgrade-grid {
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 36px;
            align-items: start;
        }
        .upgrade-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }
        .upgrade-tags span {
            display: inline-flex;
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 500;
            border-radius: var(--radius-pill);
            background: var(--card);
            border: 1px solid var(--line);
            color: var(--ink-soft);
        }
        .config-rows {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .config-row {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: var(--ink);
            transition: all var(--transition);
        }
        .config-row:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-card);
        }
        .config-row .cfg-level {
            font-weight: 700;
            font-size: 15px;
            min-width: 80px;
            color: var(--cherry);
        }
        .config-row .cfg-detail {
            font-size: 14px;
            color: var(--ink-soft);
            flex: 1;
        }
        .config-row .cfg-ver {
            font-size: 13px;
            color: var(--ink-mute);
            white-space: nowrap;
            font-family: var(--font-mono);
        }

        /* ===== DOWNLOAD ===== */
        .download-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            gap: 20px;
            align-items: start;
        }
        .download-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 22px;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            text-decoration: none;
            color: var(--ink);
        }
        .download-card:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .download-card.download-featured {
            grid-row: span 1;
            border: 2px solid var(--cherry);
        }
        .download-card .dl-name {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--ink);
        }
        .download-card .dl-version {
            font-family: var(--font-mono);
            font-size: 14px;
            color: var(--cherry);
            font-weight: 600;
            margin-bottom: 10px;
        }
        .download-card .dl-info {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 14px;
            font-size: 13px;
            color: var(--ink-soft);
        }
        .download-card .dl-info span {
            background: var(--bg);
            padding: 4px 10px;
            border-radius: 6px;
            font-family: var(--font-mono);
            font-size: 12px;
        }
        .download-card .dl-btn {
            margin-top: auto;
            align-self: flex-start;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
        }
        .faq-item {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item.active {
            border-color: var(--cherry);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 12px;
            transition: background var(--transition);
            line-height: 1.5;
        }
        .faq-question:hover {
            background: var(--cherry-light);
        }
        .faq-question .faq-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--bg);
            color: var(--cherry);
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
            transition: transform var(--transition);
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--cherry);
            color: #fff;
        }
        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition), padding var(--transition);
            font-size: 14px;
            color: var(--ink-soft);
            line-height: 1.75;
        }
        .faq-item.active .faq-answer {
            padding: 0 20px 18px;
            max-height: 400px;
        }
        .faq-answer a {
            color: var(--cherry);
            text-decoration: underline;
        }

        /* ===== SUBSCRIBE ===== */
        .subscribe-card {
            background: var(--cherry-light);
            border: 1px solid #f0d0d0;
            border-radius: var(--radius-md);
            padding: 40px 32px;
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }
        .subscribe-card h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 8px;
        }
        .subscribe-card p {
            font-size: 14px;
            color: var(--ink-soft);
            margin-bottom: 20px;
        }
        .subscribe-form {
            display: flex;
            gap: 10px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .subscribe-form input[type="email"] {
            flex: 1;
            min-width: 200px;
            height: 44px;
            padding: 0 16px;
            border: 1px solid #D8DDE5;
            border-radius: var(--radius-sm);
            font-size: 15px;
            color: var(--ink);
            background: #fff;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .subscribe-form input[type="email"]:focus {
            border-color: var(--cherry);
            box-shadow: 0 0 0 3px rgba(201,54,54,0.14);
            outline: none;
        }
        .subscribe-form button {
            height: 44px;
            padding: 0 20px;
            border-radius: var(--radius-sm);
            background: var(--cherry);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .subscribe-form button:hover {
            background: var(--cherry-hover);
            transform: translateY(-1px);
        }
        .subscribe-form button:active {
            transform: translateY(1px);
        }

        /* ===== TOPICS ===== */
        .topics-container {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .topic-row {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 18px 22px;
            text-decoration: none;
            color: var(--ink);
            transition: all var(--transition);
        }
        .topic-row:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-card);
            transform: translateY(-2px);
        }
        .topic-row .topic-name {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
        }
        .topic-row .topic-desc {
            font-size: 14px;
            color: var(--ink-soft);
            flex: 1;
            min-width: 200px;
        }
        .topic-row .topic-arrow {
            font-size: 18px;
            color: var(--cherry);
            font-weight: 700;
        }
        .topic-tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 22px;
        }
        .topic-tag-cloud a {
            display: inline-flex;
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 500;
            border-radius: var(--radius-pill);
            background: var(--card);
            border: 1px solid var(--line);
            color: var(--ink-soft);
            text-decoration: none;
            transition: all var(--transition);
        }
        .topic-tag-cloud a:hover {
            background: var(--cherry-light);
            border-color: var(--cherry);
            color: var(--cherry);
        }

        /* ===== STATS BAR ===== */
        .stats-bar {
            background: var(--ink);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-item {
            text-align: center;
            color: #fff;
            padding: 10px;
        }
        .stat-item .stat-num {
            font-size: 32px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
            letter-spacing: 0.5px;
        }
        .stat-item .stat-label {
            font-size: 13px;
            color: rgba(255,255,255,0.75);
        }

        /* ===== FOOTER ===== */
        .site-footer {
            background: var(--ink);
            color: rgba(255,255,255,0.8);
            padding: 48px 0 24px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .footer-logo {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            text-decoration: none;
            margin-bottom: 10px;
            display: block;
        }
        .footer-brand p {
            font-size: 13px;
            color: rgba(255,255,255,0.6);
            line-height: 1.7;
            max-width: 260px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul a {
            color: rgba(255,255,255,0.7);
            font-size: 13px;
            text-decoration: none;
            transition: color var(--transition);
        }
        .footer-col ul a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.15);
            padding-top: 18px;
            font-size: 12px;
            color: rgba(255,255,255,0.5);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 10px;
        }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(3, 1fr); }
            .hero-title { font-size: 32px; }
            .download-grid { grid-template-columns: 1fr 1fr; }
            .steps-4 { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 991px) {
            .hero-grid { grid-template-columns: 1fr; min-height: auto; }
            .hero-visual { min-height: 320px; }
            .hero-visual img { min-height: 320px; }
            .compare-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .tutorial-grid { grid-template-columns: 1fr; }
            .driver-query-wrap { grid-template-columns: 1fr; }
            .activation-grid { grid-template-columns: 1fr; }
            .upgrade-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .stats-bar { grid-template-columns: repeat(2, 1fr); }
            .main-nav {
                display: none;
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                bottom: 0;
                background: #fff;
                flex-direction: column;
                align-items: stretch;
                justify-content: flex-start;
                padding: 20px;
                gap: 4px;
                z-index: 55;
                overflow-y: auto;
                border-top: 1px solid var(--line);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 14px 16px;
                font-size: 15px;
                border-bottom: 1px solid var(--line-soft);
                border-radius: 0;
            }
            .main-nav a.active::after {
                left: 0;
                right: auto;
                bottom: auto;
                top: 50%;
                transform: translateY(-50%);
                height: 60%;
                width: 3px;
                background: var(--cherry);
            }
            .nav-toggle {
                display: flex;
            }
            .nav-cta {
                display: none;
            }
        }
        @media (max-width: 768px) {
            section { padding: var(--section-pad-mobile) 0; }
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .grid-3 { grid-template-columns: 1fr; }
            .grid-2 { grid-template-columns: 1fr; }
            .hero { padding: 40px 0 48px; }
            .hero-title { font-size: 28px; }
            .section-title { font-size: 24px; }
            .download-grid { grid-template-columns: 1fr; }
            .steps-4 { grid-template-columns: 1fr 1fr; }
            .stats-bar { grid-template-columns: 1fr 1fr; padding: 28px 18px; }
            .footer-grid { grid-template-columns: 1fr; }
            .foter-bottom { flex-direction: column; text-align: center; }
            .news-item { flex-direction: column; }
            .news-item .news-thumb { width: 100%; height: 160px; }
            .tutorial-card { flex-direction: column; }
            .tutorial-card .tut-thumb { width: 100%; height: 160px; }
            .compare-row { flex-direction: column; align-items: flex-start; }
            .config-row { flex-direction: column; align-items: flex-start; }
        }
        @media (max-width: 576px) {
            .container { padding: 0 16px; }
            .hero-title { font-size: 26px; }
            .grid-4 { grid-template-columns: 1fr; }
            .steps-4 { grid-template-columns: 1fr; }
            .stats-bar { grid-template-columns: 1fr; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; }
            .subscribe-form { flex-direction: column; }
            .subscribe-form input[type="email"] { width: 100%; min-width: auto; }
            .subscribe-form button { width: 100%; }
            .section-title { font-size: 22px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        }

/* roulang page: article */
:root {
            --cherry: #C93636;
            --cherry-hover: #A92B2B;
            --cherry-light: #FBEAEA;
            --ink: #22262E;
            --ink-soft: #5D6673;
            --ink-mute: #8A94A3;
            --bg: #F5F6F8;
            --card: #FFFFFF;
            --line: #E5E8EE;
            --line-soft: #EDEFF4;
            --red-win: #E23D3D;
            --green-win: #3DAA5B;
            --blue-win: #2F6FED;
            --yellow-win: #F0B429;
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-pill: 999px;
            --shadow-card: 0 10px 28px rgba(26,28,34,0.06);
            --shadow-hover: 0 16px 40px rgba(201,54,54,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
            --font-mono: SFMono-Regular, Consolas, monospace;
            --container: 1200px;
            --nav-height: 64px;
            --section-pad-desktop: 72px;
            --section-pad-mobile: 44px;
            --transition: 0.22s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--ink);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--cherry);
            text-decoration: underline;
            transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
        }
        a:hover {
            color: var(--cherry-hover);
        }
        a:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        /* ===== NAV ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: #fff;
            border-bottom: 1px solid var(--line);
            border-top: 3px solid var(--cherry);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }
        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--ink);
            text-decoration: none;
            white-space: nowrap;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--cherry);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
        }
        .logo:hover {
            color: var(--cherry);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }
        .main-nav a {
            color: var(--ink);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: color var(--transition), background var(--transition);
        }
        .main-nav a:hover {
            color: var(--cherry);
            background: var(--cherry-light);
        }
        .main-nav a.active {
            color: var(--cherry);
            font-weight: 700;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            background: var(--cherry);
            border-radius: 2px;
        }
        .nav-cta {
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: background var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-cta:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .nav-cta:active {
            transform: translateY(1px);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            border-radius: 8px;
        }
        .nav-toggle span {
            width: 26px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: all var(--transition);
            display: block;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        /* ===== FOOTER ===== */
        .site-footer {
            background: var(--ink);
            color: #fff;
            padding: 52px 0 24px;
            margin-top: 0;
        }
        .site-footer .container {
            max-width: var(--container);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.12);
        }
        .footer-brand p {
            color: rgba(255,255,255,0.7);
            font-size: 14px;
            line-height: 1.7;
            margin-top: 12px;
        }
        .footer-logo {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            text-decoration: none;
        }
        .footer-logo:hover {
            color: #ffb3b3;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 14px;
            color: #fff;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col li {
            margin-bottom: 8px;
        }
        .footer-col a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            font-size: 14px;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: #ffb3b3;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            padding-top: 24px;
            font-size: 13px;
            color: rgba(255,255,255,0.55);
        }
        /* ===== ARTICLE PAGE ===== */
        .article-main {
            padding: 40px 0 0;
            background: var(--bg);
        }
        .breadcrumb-custom {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 14px;
            color: var(--ink-mute);
            margin-bottom: 20px;
        }
        .breadcrumb-custom a {
            color: var(--ink-soft);
            text-decoration: none;
        }
        .breadcrumb-custom a:hover {
            color: var(--cherry);
        }
        .breadcrumb-sep {
            color: var(--ink-mute);
        }
        .article-container {
            display: grid;
            grid-template-columns: minmax(0,1fr) 320px;
            gap: 32px;
            align-items: start;
        }
        .article-main-content {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }
        .article-header {
            padding: 32px;
            border-bottom: 1px solid var(--line-soft);
        }
        .article-category-badge {
            display: inline-block;
            background: var(--cherry-light);
            color: var(--cherry);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 16px;
        }
        .article-header h1 {
            font-size: 30px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 14px;
            color: var(--ink-mute);
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-body {
            padding: 32px;
            font-size: 16px;
            line-height: 1.9;
            color: var(--ink);
        }
        .article-body h2 {
            font-size: 24px;
            line-height: 1.35;
            font-weight: 700;
            margin: 28px 0 12px;
            padding-top: 8px;
            color: var(--ink);
        }
        .article-body h3 {
            font-size: 20px;
            line-height: 1.4;
            font-weight: 700;
            margin: 24px 0 10px;
            color: var(--ink);
        }
        .article-body p {
            margin-bottom: 16px;
        }
        .article-body ul,
        .article-body ol {
            margin: 0 0 20px 24px;
            padding-left: 8px;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body pre {
            background: #1E1E1E;
            color: #D4D4D4;
            padding: 18px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            font-family: var(--font-mono);
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 20px;
        }
        .article-body code {
            font-family: var(--font-mono);
            font-size: 0.9em;
            background: var(--line-soft);
            padding: 2px 6px;
            border-radius: 6px;
        }
        .article-body pre code {
            background: none;
            padding: 0;
            border-radius: 0;
        }
        .article-body blockquote {
            border-left: 4px solid var(--cherry);
            background: var(--cherry-light);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 0 0 20px;
            color: var(--ink-soft);
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 20px;
            font-size: 14px;
        }
        .article-body table th,
        .article-body table td {
            border: 1px solid var(--line);
            padding: 10px 14px;
            text-align: left;
        }
        .article-body table th {
            background: var(--line-soft);
            font-weight: 600;
        }
        .article-body .article-tip {
            background: #FFF7E6;
            border: 1px solid #F0B429;
            border-radius: var(--radius-sm);
            padding: 14px 18px;
            margin-bottom: 20px;
            color: #6B4F0A;
        }
        .article-body .article-warning {
            background: #FDECEC;
            border: 1px solid var(--cherry);
            border-radius: var(--radius-sm);
            padding: 14px 18px;
            margin-bottom: 20px;
            color: #8B1A1A;
        }
        .article-body img {
            border-radius: var(--radius-sm);
            margin: 16px 0;
            border: 1px solid var(--line);
        }
        .article-not-found {
            padding: 48px 32px;
            text-align: center;
        }
        .article-not-found h2 {
            font-size: 24px;
            margin-bottom: 12px;
        }
        .article-not-found .btn-return {
            display: inline-block;
            margin-top: 16px;
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .article-not-found .btn-return:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .download-info-card {
            margin: 24px 32px 32px;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 24px;
        }
        .download-info-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 14px;
        }
        .download-info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 12px;
            margin-bottom: 20px;
        }
        .download-info-item {
            background: #fff;
            border-radius: var(--radius-sm);
            padding: 12px 14px;
            border: 1px solid var(--line-soft);
        }
        .download-info-item .label {
            font-size: 12px;
            color: var(--ink-mute);
            display: block;
            margin-bottom: 4px;
        }
        .download-info-item .value {
            font-family: var(--font-mono);
            font-size: 14px;
            font-weight: 600;
            word-break: break-all;
        }
        .btn-download {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .btn-download:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-2px);
        }
        .article-sidebar {
            position: sticky;
            top: calc(var(--nav-height) + 20px);
        }
        .sidebar-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            padding: 20px;
            margin-bottom: 20px;
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--ink);
        }
        .related-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .related-item {
            display: flex;
            gap: 12px;
            text-decoration: none;
            color: var(--ink);
            padding: 10px;
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            transition: border-color var(--transition), background var(--transition), transform var(--transition);
        }
        .related-item:hover {
            border-color: var(--cherry);
            background: var(--cherry-light);
            transform: translateX(4px);
            color: var(--ink);
        }
        .related-thumb {
            width: 72px;
            height: 52px;
            flex-shrink: 0;
            background: var(--line-soft);
            border-radius: 8px;
            overflow: hidden;
        }
        .related-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .related-info {
            flex: 1;
            min-width: 0;
        }
        .related-title {
            font-size: 14px;
            font-weight: 600;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-date {
            font-size: 12px;
            color: var(--ink-mute);
            margin-top: 4px;
        }
        .prev-next-nav {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            padding: 20px;
            margin-bottom: 24px;
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }
        .prev-next-link {
            text-decoration: none;
            color: var(--ink);
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 14px;
            border-radius: 8px;
            transition: background var(--transition), color var(--transition);
        }
        .prev-next-link:hover {
            background: var(--cherry-light);
            color: var(--cherry);
        }
        .subscribe-section {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            padding: 32px;
            margin: 32px 0 48px;
            text-align: center;
        }
        .subscribe-section h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .subscribe-section p {
            color: var(--ink-soft);
            font-size: 14px;
            margin-bottom: 20px;
        }
        .subscribe-form {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .subscribe-form input[type="email"] {
            width: 320px;
            max-width: 100%;
            height: 44px;
            border-radius: var(--radius-sm);
            border: 1px solid #D8DDE5;
            padding: 0 16px;
            background: #fff;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .subscribe-form input[type="email"]:focus {
            border-color: var(--cherry);
            box-shadow: 0 0 0 3px rgba(201,54,54,0.14);
            outline: none;
        }
        .btn-subscribe {
            height: 44px;
            background: var(--cherry);
            color: #fff;
            border-radius: var(--radius-sm);
            padding: 0 28px;
            font-weight: 600;
            font-size: 15px;
            transition: background var(--transition), transform var(--transition);
        }
        .btn-subscribe:hover {
            background: var(--cherry-hover);
            transform: translateY(-2px);
        }
        .btn-subscribe:active {
            transform: translateY(1px);
        }
        /* ===== RESPONSIVE ===== */
        @media (max-width: 991px) {
            .article-container {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                position: static;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .main-nav {
                position: fixed;
                top: var(--nav-height);
                right: -100%;
                width: 80%;
                max-width: 320px;
                height: calc(100vh - var(--nav-height));
                background: #fff;
                flex-direction: column;
                align-items: stretch;
                justify-content: flex-start;
                padding: 24px;
                box-shadow: -8px 0 30px rgba(0,0,0,0.08);
                transition: right var(--transition);
                gap: 8px;
                z-index: 59;
            }
            .main-nav.open {
                right: 0;
            }
            .main-nav a {
                display: block;
                padding: 12px 16px;
                font-size: 16px;
                border-bottom: 1px solid var(--line-soft);
            }
            .main-nav a.active::after {
                left: 16px;
                right: 16px;
            }
            .nav-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-inner .nav-cta-mobile {
                display: none;
            }
        }
        @media (max-width: 767px) {
            .article-header h1 {
                font-size: 24px;
            }
            .article-body {
                padding: 20px;
            }
            .article-body h2 {
                font-size: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .download-info-grid {
                grid-template-columns: 1fr 1fr;
            }
            .subscribe-form input[type="email"] {
                width: 100%;
            }
            .subscribe-form {
                flex-direction: column;
            }
        }
        @media (max-width: 520px) {
            .article-header {
                padding: 20px;
            }
            .article-header h1 {
                font-size: 21px;
            }
            .article-body {
                padding: 16px;
                font-size: 15px;
            }
            .download-info-card {
                margin: 16px 16px 24px;
                padding: 16px;
            }
            .download-info-grid {
                grid-template-columns: 1fr;
            }
            .prev-next-nav {
                flex-direction: column;
            }
            .subscribe-section {
                padding: 20px;
            }
            .container {
                padding: 0 16px;
            }
        }

/* roulang page: category1 */
:root {
            --cherry: #C93636;
            --cherry-hover: #A92B2B;
            --cherry-light: #FBEAEA;
            --ink: #22262E;
            --ink-soft: #5D6673;
            --ink-mute: #8A94A3;
            --bg: #F5F6F8;
            --card: #FFFFFF;
            --line: #E5E8EE;
            --line-soft: #EDEFF4;
            --red-win: #E23D3D;
            --green-win: #3DAA5B;
            --blue-win: #2F6FED;
            --yellow-win: #F0B429;
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-pill: 999px;
            --shadow-card: 0 10px 28px rgba(26,28,34,0.06);
            --shadow-hover: 0 16px 40px rgba(201,54,54,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
            --font-mono: SFMono-Regular, Consolas, monospace;
            --container: 1200px;
            --nav-height: 64px;
            --section-pad-desktop: 72px;
            --section-pad-mobile: 44px;
            --transition: 0.22s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--ink);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--cherry);
            text-decoration: underline;
            transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
        }
        a:hover {
            color: var(--cherry-hover);
        }
        a:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button, input, select {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible, input:focus-visible, select:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        /* ===== NAV ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: #fff;
            border-bottom: 1px solid var(--line);
            border-top: 3px solid var(--cherry);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }
        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--ink);
            text-decoration: none;
            white-space: nowrap;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--cherry);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
        }
        .logo:hover {
            color: var(--cherry);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }
        .main-nav a {
            color: var(--ink);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: color var(--transition), background var(--transition);
        }
        .main-nav a:hover {
            color: var(--cherry);
            background: var(--cherry-light);
        }
        .main-nav a.active {
            color: var(--cherry);
            font-weight: 700;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            background: var(--cherry);
            border-radius: 2px;
        }
        .nav-cta {
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: background var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-cta:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .nav-cta:active {
            transform: translateY(1px);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            border-radius: 8px;
        }
        .nav-toggle span {
            width: 26px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: all var(--transition);
            display: block;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        /* ===== BREADCRUMB / PAGE HERO ===== */
        .page-hero {
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 28px 0 26px;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--ink-mute);
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--ink-soft);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--cherry);
        }
        .breadcrumb .sep {
            color: var(--ink-mute);
        }
        .page-hero h1 {
            font-size: 30px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 8px;
            letter-spacing: 0.5px;
        }
        .page-hero .lead {
            font-size: 15px;
            color: var(--ink-soft);
            max-width: 780px;
            line-height: 1.7;
        }
        /* ===== SECTION BASE ===== */
        section {
            padding: var(--section-pad-desktop) 0;
        }
        .section-alt {
            background: #fff;
        }
        .section-label {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 1px;
            color: var(--cherry);
            background: var(--cherry-light);
            padding: 5px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 12px;
        }
        h2.section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 10px;
            letter-spacing: 0.3px;
        }
        .section-desc {
            font-size: 15px;
            color: var(--ink-soft);
            max-width: 680px;
            line-height: 1.8;
            margin-bottom: 30px;
        }
        /* ===== FILTER BAR ===== */
        .filter-bar {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-card);
        }
        .filter-group {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .filter-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--ink-soft);
            white-space: nowrap;
        }
        .filter-btn {
            padding: 7px 16px;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 500;
            border: 1px solid var(--line);
            background: #fff;
            color: var(--ink-soft);
            transition: all var(--transition);
        }
        .filter-btn:hover {
            border-color: var(--cherry);
            color: var(--cherry);
            background: var(--cherry-light);
        }
        .filter-btn.active {
            background: var(--cherry);
            border-color: var(--cherry);
            color: #fff;
            font-weight: 600;
        }
        .filter-select {
            height: 38px;
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            padding: 0 12px;
            font-size: 13px;
            color: var(--ink);
            background: #fff;
            min-width: 160px;
        }
        .filter-search {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: auto;
        }
        .filter-search input {
            height: 38px;
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            padding: 0 14px;
            font-size: 13px;
            width: 220px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .filter-search input:focus {
            border-color: var(--cherry);
            box-shadow: 0 0 0 3px rgba(201,54,54,0.1);
            outline: none;
        }
        .filter-search button {
            background: var(--cherry);
            color: #fff;
            height: 38px;
            padding: 0 18px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .filter-search button:hover {
            background: var(--cherry-hover);
            transform: translateY(-1px);
        }
        /* ===== DOWNLOAD CARD LIST ===== */
        .download-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 14px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }
        .download-card:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .download-card .dc-badge {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: var(--cherry-light);
            color: var(--cherry);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 14px;
            flex-shrink: 0;
        }
        .download-card .dc-main {
            flex: 1;
            min-width: 200px;
        }
        .download-card .dc-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 4px;
        }
        .download-card .dc-title a {
            color: var(--ink);
            text-decoration: none;
        }
        .download-card .dc-title a:hover {
            color: var(--cherry);
        }
        .download-card .dc-meta {
            font-size: 13px;
            color: var(--ink-mute);
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .download-card .dc-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .download-card .dc-meta .mono {
            font-family: var(--font-mono);
            font-size: 12px;
        }
        .download-card .dc-action .btn-cherry {
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 9px 18px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-weight: 600;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: background var(--transition), transform var(--transition);
        }
        .download-card .dc-action .btn-cherry:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-outline-dark {
            background: transparent;
            color: var(--ink);
            text-decoration: none;
            padding: 9px 18px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-weight: 600;
            border: 1px solid var(--ink);
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }
        .btn-outline-dark:hover {
            background: var(--cherry-light);
            border-color: var(--cherry);
            color: var(--cherry);
        }
        .view-more-wrap {
            text-align: center;
            margin-top: 22px;
        }
        /* ===== VERSION DIFF ===== */
        .diff-row-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 18px 24px;
            display: flex;
            align-items: flex-start;
            gap: 16px;
            margin-bottom: 12px;
            box-shadow: var(--shadow-card);
            transition: border-color var(--transition);
        }
        .diff-row-card:hover {
            border-color: var(--cherry);
        }
        .diff-row-card .diff-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--cherry-light);
            color: var(--cherry);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 16px;
            flex-shrink: 0;
        }
        .diff-row-card .diff-body {
            flex: 1;
        }
        .diff-row-card .diff-body h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 4px;
        }
        .diff-row-card .diff-body p {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0;
            line-height: 1.7;
        }
        .diff-row-card .diff-tag {
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            background: var(--line-soft);
            color: var(--ink-soft);
            white-space: nowrap;
        }
        /* ===== REQUIREMENTS ===== */
        .req-panel {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 28px 30px;
            box-shadow: var(--shadow-card);
        }
        .req-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px 30px;
        }
        .req-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            border-bottom: 1px solid var(--line-soft);
            padding-bottom: 14px;
        }
        .req-item .req-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            background: var(--cherry-light);
            color: var(--cherry);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 13px;
            flex-shrink: 0;
        }
        .req-item .req-info h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 2px;
        }
        .req-item .req-info p {
            font-size: 13px;
            color: var(--ink-soft);
            margin: 0;
        }
        /* ===== TUTORIAL CARDS ===== */
        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .tutorial-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .tutorial-card:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }
        .tutorial-card .tc-img {
            height: 150px;
            background: var(--line-soft);
            overflow: hidden;
        }
        .tutorial-card .tc-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .tutorial-card .tc-body {
            padding: 18px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .tutorial-card .tc-body h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 6px;
            line-height: 1.5;
        }
        .tutorial-card .tc-body h3 a {
            color: var(--ink);
            text-decoration: none;
        }
        .tutorial-card .tc-body h3 a:hover {
            color: var(--cherry);
        }
        .tutorial-card .tc-body p {
            font-size: 13px;
            color: var(--ink-soft);
            margin-bottom: 12px;
            flex: 1;
        }
        .tutorial-card .tc-meta {
            font-size: 12px;
            color: var(--ink-mute);
            display: flex;
            gap: 12px;
        }
        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            margin-bottom: 10px;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item.open {
            border-color: var(--cherry);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--cherry);
        }
        .faq-question .faq-icon {
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: var(--line-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            color: var(--ink-soft);
            flex-shrink: 0;
            transition: all var(--transition);
        }
        .faq-item.open .faq-question .faq-icon {
            background: var(--cherry);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            display: none;
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--ink-soft);
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        /* ===== NEWSLETTER ===== */
        .newsletter-section {
            background: #fff;
        }
        .newsletter-inner {
            background: var(--cherry-light);
            border: 1px solid #F5D3D3;
            border-radius: var(--radius-md);
            padding: 36px 40px;
            text-align: center;
            max-width: 780px;
            margin: 0 auto;
        }
        .newsletter-inner h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 6px;
        }
        .newsletter-inner p {
            font-size: 14px;
            color: var(--ink-soft);
            margin-bottom: 20px;
        }
        .newsletter-form {
            display: flex;
            gap: 10px;
            max-width: 460px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .newsletter-form input {
            flex: 1;
            min-width: 220px;
            height: 44px;
            border: 1px solid #D8DDE5;
            border-radius: var(--radius-sm);
            padding: 0 16px;
            font-size: 14px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .newsletter-form input:focus {
            border-color: var(--cherry);
            box-shadow: 0 0 0 3px rgba(201,54,54,0.1);
            outline: none;
        }
        .newsletter-form button {
            background: var(--cherry);
            color: #fff;
            height: 44px;
            padding: 0 26px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .newsletter-form button:hover {
            background: var(--cherry-hover);
            transform: translateY(-1px);
        }
        /* ===== FOOTER ===== */
        .site-footer {
            background: #22262E;
            color: #C5CAD4;
            padding: 52px 0 28px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 300px 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 32px;
        }
        .footer-brand .footer-logo {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            text-decoration: none;
            display: inline-block;
            margin-bottom: 10px;
        }
        .footer-brand .footer-logo:hover {
            color: var(--cherry);
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.7;
            color: #9AA1B0;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: #9AA1B0;
            text-decoration: none;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid #3A3F4A;
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 12px;
            color: #8A94A3;
        }
        /* ===== RESPONSIVE ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .req-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 991px) {
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: var(--nav-height);
                right: 0;
                bottom: 0;
                width: 280px;
                background: #fff;
                border-left: 1px solid var(--line);
                flex-direction: column;
                align-items: stretch;
                justify-content: flex-start;
                padding: 16px;
                gap: 2px;
                transform: translateX(100%);
                transition: transform 0.25s ease;
                box-shadow: -10px 0 30px rgba(0,0,0,0.08);
                z-index: 59;
            }
            .main-nav.open {
                transform: translateX(0);
            }
            .main-nav a {
                padding: 12px 16px;
                font-size: 15px;
                width: 100%;
            }
            .main-nav a.active::after {
                left: 16px;
                right: auto;
                top: 50%;
                bottom: auto;
                width: 3px;
                height: 22px;
                transform: translateY(-50%);
                border-radius: 2px;
            }
            .nav-cta {
                display: none;
            }
            .filter-search {
                margin-left: 0;
                width: 100%;
            }
            .filter-search input {
                flex: 1;
                width: auto;
            }
        }
        @media (max-width: 767px) {
            section {
                padding: var(--section-pad-mobile) 0;
            }
            .page-hero {
                padding: 20px 0;
            }
            .page-hero h1 {
                font-size: 24px;
            }
            h2.section-title {
                font-size: 22px;
            }
            .filter-bar {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
            }
            .download-card {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .tutorial-grid {
                grid-template-columns: 1fr;
            }
            .diff-row-card {
                flex-wrap: wrap;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .newsletter-inner {
                padding: 24px 20px;
            }
            .newsletter-form input {
                width: 100%;
                min-width: 0;
            }
            .newsletter-form button {
                width: 100%;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-hero h1 {
                font-size: 21px;
            }
            .filter-group {
                width: 100%;
            }
            .filter-select {
                width: 100%;
                min-width: 0;
            }
            .req-panel {
                padding: 20px 18px;
            }
            .req-grid {
                gap: 12px;
            }
        }

/* roulang page: category3 */
:root {
            --cherry: #C93636;
            --cherry-hover: #A92B2B;
            --cherry-light: #FBEAEA;
            --ink: #22262E;
            --ink-soft: #5D6673;
            --ink-mute: #8A94A3;
            --bg: #F5F6F8;
            --card: #FFFFFF;
            --line: #E5E8EE;
            --line-soft: #EDEFF4;
            --red-win: #E23D3D;
            --green-win: #3DAA5B;
            --blue-win: #2F6FED;
            --yellow-win: #F0B429;
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-pill: 999px;
            --shadow-card: 0 10px 28px rgba(26,28,34,0.06);
            --shadow-hover: 0 16px 40px rgba(201,54,54,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
            --font-mono: SFMono-Regular, Consolas, monospace;
            --container: 1200px;
            --nav-height: 64px;
            --section-pad-desktop: 72px;
            --section-pad-mobile: 44px;
            --transition: 0.22s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--ink);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--cherry);
            text-decoration: underline;
            transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
        }
        a:hover {
            color: var(--cherry-hover);
        }
        a:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button, input, select {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible, input:focus-visible, select:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== NAV ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: #fff;
            border-bottom: 1px solid var(--line);
            border-top: 3px solid var(--cherry);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }
        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--ink);
            text-decoration: none;
            white-space: nowrap;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }
        .logo .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--cherry);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 800;
        }
        .logo:hover {
            color: var(--cherry);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }
        .main-nav a {
            color: var(--ink);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: color var(--transition), background var(--transition);
        }
        .main-nav a:hover {
            color: var(--cherry);
            background: var(--cherry-light);
        }
        .main-nav a.active {
            color: var(--cherry);
            font-weight: 700;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            background: var(--cherry);
            border-radius: 2px;
        }
        .nav-cta {
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: background var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-cta:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .nav-cta:active {
            transform: translateY(1px);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            border-radius: 8px;
        }
        .nav-toggle span {
            width: 26px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: all var(--transition);
            display: block;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== BREADCRUMB & H1 ===== */
        .page-heading {
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 28px 0 22px;
        }
        .breadcrumb-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--ink-mute);
            margin-bottom: 14px;
            flex-wrap: wrap;
        }
        .breadcrumb-bar a {
            color: var(--ink-mute);
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb-bar a:hover {
            color: var(--cherry);
        }
        .breadcrumb-sep {
            color: var(--line);
            font-size: 12px;
        }
        .breadcrumb-current {
            color: var(--cherry);
            font-weight: 600;
        }
        .page-heading h1 {
            font-size: 32px;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.35;
            letter-spacing: 0.3px;
        }
        .page-heading .heading-sub {
            font-size: 16px;
            color: var(--ink-soft);
            margin: 0;
            max-width: 780px;
            line-height: 1.8;
        }

        /* ===== SECTION COMMON ===== */
        main section {
            padding: var(--section-pad-desktop) 0;
        }
        main section.bg-white {
            background: #fff;
        }
        main section.bg-gray {
            background: var(--bg);
        }
        .section-head {
            margin-bottom: 36px;
        }
        .section-head h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 10px;
            line-height: 1.4;
        }
        .section-head p {
            font-size: 15px;
            color: var(--ink-soft);
            margin: 0;
            max-width: 720px;
            line-height: 1.8;
        }

        /* ===== FILTER TOOLBAR ===== */
        .filter-toolbar {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            box-shadow: var(--shadow-card);
        }
        .filter-toolbar .filter-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink-soft);
            white-space: nowrap;
        }
        .filter-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .filter-btn {
            padding: 8px 16px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--line);
            background: #fff;
            color: var(--ink-soft);
            font-size: 13px;
            font-weight: 500;
            transition: all var(--transition);
            text-decoration: none;
            cursor: pointer;
        }
        .filter-btn:hover {
            border-color: var(--cherry);
            color: var(--cherry);
            background: var(--cherry-light);
        }
        .filter-btn.active {
            background: var(--cherry);
            border-color: var(--cherry);
            color: #fff;
        }
        .filter-btn:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
        }

        /* ===== TUTORIAL ROW CARDS ===== */
        .tutorial-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .tutorial-row {
            display: flex;
            align-items: center;
            gap: 18px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            text-decoration: none;
            color: var(--ink);
        }
        .tutorial-row:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: var(--cherry);
            color: var(--ink);
            text-decoration: none;
        }
        .tutorial-row:hover .tutorial-title {
            color: var(--cherry);
        }
        .tutorial-step-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--cherry-light);
            color: var(--cherry);
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .tutorial-body {
            flex: 1;
            min-width: 0;
        }
        .tutorial-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 4px;
            transition: color var(--transition);
        }
        .tutorial-summary {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0;
            line-height: 1.6;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }
        .tutorial-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-shrink: 0;
            font-size: 13px;
            color: var(--ink-mute);
        }
        .tutorial-meta .meta-item {
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .tutorial-meta .badge-difficulty {
            padding: 4px 10px;
            border-radius: var(--radius-pill);
            font-size: 12px;
            font-weight: 600;
            background: var(--cherry-light);
            color: var(--cherry);
        }
        .tutorial-meta .badge-difficulty.easy {
            background: #E8F5EC;
            color: var(--green-win);
        }
        .tutorial-meta .badge-difficulty.mid {
            background: #FFF6E0;
            color: #B67A00;
        }

        /* ===== DRIVER QUERY ===== */
        .driver-query-wrap {
            display: flex;
            gap: 28px;
            align-items: flex-start;
        }
        .driver-query-form {
            flex: 1;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow-card);
        }
        .driver-query-form label {
            font-size: 14px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 8px;
            display: block;
        }
        .driver-query-form label .required {
            color: var(--cherry);
        }
        .driver-query-form .input-row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .driver-query-form input[type="text"] {
            flex: 1;
            min-width: 220px;
            height: 44px;
            border-radius: var(--radius-sm);
            border: 1px solid #D8DDE5;
            padding: 0 14px;
            font-size: 14px;
            background: #fff;
            color: var(--ink);
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .driver-query-form input[type="text"]:focus {
            border-color: var(--cherry);
            box-shadow: 0 0 0 4px rgba(201,54,54,0.14);
            outline: none;
        }
        .driver-query-form input[type="text"]::placeholder {
            color: var(--ink-mute);
        }
        .driver-query-form .query-btn {
            height: 44px;
            padding: 0 24px;
            background: var(--cherry);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
            white-space: nowrap;
        }
        .driver-query-form .query-btn:hover {
            background: var(--cherry-hover);
            transform: translateY(-1px);
        }
        .driver-query-form .query-btn:active {
            transform: translateY(1px);
        }
        .brand-tag-cloud {
            margin-top: 14px;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .brand-tag {
            padding: 5px 12px;
            border-radius: var(--radius-pill);
            background: var(--cherry-light);
            color: var(--cherry);
            font-size: 13px;
            font-weight: 500;
            text-decoration: none;
            border: 1px solid transparent;
            transition: all var(--transition);
        }
        .brand-tag:hover {
            background: #fff;
            border-color: var(--cherry);
            color: var(--cherry);
        }
        .query-result-placeholder {
            width: 300px;
            flex-shrink: 0;
            background: var(--line-soft);
            border: 1px dashed var(--line);
            border-radius: var(--radius-md);
            min-height: 180px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--ink-mute);
            font-size: 14px;
            text-align: center;
            padding: 20px;
        }

        /* ===== ERROR CARDS ===== */
        .error-card-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px;
        }
        .error-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 22px;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            text-decoration: none;
            color: var(--ink);
            display: block;
        }
        .error-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: var(--cherry);
            color: var(--ink);
            text-decoration: none;
        }
        .error-card:hover .error-card-title {
            color: var(--cherry);
        }
        .error-code {
            display: inline-block;
            padding: 4px 10px;
            border-radius: var(--radius-pill);
            background: var(--cherry-light);
            color: var(--cherry);
            font-size: 12px;
            font-weight: 700;
            font-family: var(--font-mono);
            margin-bottom: 10px;
        }
        .error-card-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 6px;
            transition: color var(--transition);
        }
        .error-card-desc {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0;
            line-height: 1.6;
        }

        /* ===== MIRROR RECOMMEND ===== */
        .mirror-reco-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }
        .mirror-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 22px;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            text-decoration: none;
            color: var(--ink);
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .mirror-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: var(--cherry);
            color: var(--ink);
            text-decoration: none;
        }
        .mirror-card:hover .mirror-card-title {
            color: var(--cherry);
        }
        .mirror-card .mirror-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 8px;
            font-size: 20px;
            font-weight: 700;
        }
        .mirror-card .mirror-icon.win12 {
            background: var(--cherry-light);
            color: var(--cherry);
        }
        .mirror-card .mirror-icon.win10-pro {
            background: #E8F0FF;
            color: var(--blue-win);
        }
        .mirror-card .mirror-icon.win10-lite {
            background: #E8F5EC;
            color: var(--green-win);
        }
        .mirror-card-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin: 0;
            transition: color var(--transition);
        }
        .mirror-card-info {
            font-size: 13px;
            color: var(--ink-soft);
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mirror-card-info span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .mirror-card-link {
            margin-top: auto;
            font-size: 14px;
            font-weight: 600;
            color: var(--cherry);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .mirror-card-link:hover {
            color: var(--cherry-hover);
            text-decoration: underline;
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            margin-bottom: 10px;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item.open {
            border-color: var(--cherry);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--cherry);
        }
        .faq-question .faq-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: var(--cherry-light);
            color: var(--cherry);
            font-size: 18px;
            font-weight: 600;
            flex-shrink: 0;
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            display: none;
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--ink-soft);
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-answer a {
            color: var(--cherry);
            text-decoration: underline;
        }
        .faq-answer a:hover {
            color: var(--cherry-hover);
        }

        /* ===== SUBSCRIBE CTA ===== */
        .subscribe-cta {
            background: var(--cherry);
            border-radius: var(--radius-md);
            padding: 44px 36px;
            text-align: center;
            max-width: 860px;
            margin: 0 auto;
        }
        .subscribe-cta h2 {
            font-size: 24px;
            font-weight: 800;
            color: #fff;
            margin: 0 0 10px;
        }
        .subscribe-cta p {
            font-size: 15px;
            color: rgba(255,255,255,0.85);
            margin: 0 0 24px;
            line-height: 1.7;
        }
        .subscribe-form {
            display: flex;
            gap: 12px;
            max-width: 460px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .subscribe-form input[type="email"] {
            flex: 1;
            min-width: 220px;
            height: 44px;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255,255,255,0.3);
            padding: 0 14px;
            font-size: 14px;
            background: rgba(255,255,255,0.12);
            color: #fff;
            transition: border-color var(--transition), background var(--transition);
        }
        .subscribe-form input[type="email"]::placeholder {
            color: rgba(255,255,255,0.65);
        }
        .subscribe-form input[type="email"]:focus {
            border-color: #fff;
            background: rgba(255,255,255,0.2);
            outline: none;
        }
        .subscribe-form button {
            height: 44px;
            padding: 0 28px;
            background: #fff;
            color: var(--cherry);
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 700;
            transition: background var(--transition), transform var(--transition);
            white-space: nowrap;
        }
        .subscribe-form button:hover {
            background: var(--cherry-light);
            transform: translateY(-1px);
        }
        .subscribe-form button:active {
            transform: translateY(1px);
        }

        /* ===== FOOTER ===== */
        .site-footer {
            background: var(--ink);
            color: rgba(255,255,255,0.75);
            padding: 48px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .footer-brand .footer-logo {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            text-decoration: none;
            display: inline-block;
            margin-bottom: 10px;
        }
        .footer-brand .footer-logo:hover {
            color: var(--cherry);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            margin: 0;
            color: rgba(255,255,255,0.65);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul li a {
            color: rgba(255,255,255,0.65);
            text-decoration: none;
            font-size: 14px;
            transition: color var(--transition);
            display: inline-block;
        }
        .footer-col ul li a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .footer-bottom {
            padding: 18px 0 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255,255,255,0.5);
        }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 1024px) {
            .main-nav {
                gap: 0;
            }
            .main-nav a {
                padding: 8px 10px;
                font-size: 13px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .error-card-grid {
                grid-template-columns: 1fr;
            }
            .mirror-reco-grid {
                grid-template-columns: 1fr 1fr;
            }
            .driver-query-wrap {
                flex-direction: column;
            }
            .query-result-placeholder {
                width: 100%;
                min-height: 100px;
            }
        }

        @media (max-width: 768px) {
            .site-header {
                height: auto;
                min-height: 60px;
            }
            .nav-inner {
                padding: 8px 16px;
                flex-wrap: wrap;
                gap: 12px;
            }
            .nav-toggle {
                display: flex;
                order: 3;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                align-items: stretch;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--line);
                padding: 12px 16px;
                box-shadow: 0 20px 40px rgba(26,28,34,0.1);
                gap: 2px;
                order: 4;
                width: 100%;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 12px;
                font-size: 14px;
                text-align: left;
            }
            .main-nav a.active::after {
                left: 12px;
                right: 12px;
                bottom: 0;
            }
            .nav-cta {
                margin-left: auto;
                order: 2;
            }
            main section {
                padding: var(--section-pad-mobile) 0;
            }
            .page-heading h1 {
                font-size: 26px;
            }
            .section-head h2 {
                font-size: 22px;
            }
            .tutorial-row {
                flex-wrap: wrap;
                padding: 14px 16px;
            }
            .tutorial-meta {
                width: 100%;
                justify-content: flex-start;
                padding-left: 62px;
                flex-wrap: wrap;
            }
            .mirror-reco-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
            .subscribe-cta {
                padding: 28px 20px;
            }
            .subscribe-cta h2 {
                font-size: 20px;
            }
            .filter-toolbar {
                padding: 14px;
            }
            .driver-query-form {
                padding: 20px;
            }
            .error-card-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .logo {
                font-size: 16px;
            }
            .nav-cta {
                padding: 8px 14px;
                font-size: 13px;
            }
            .page-heading h1 {
                font-size: 22px;
            }
            .section-head h2 {
                font-size: 20px;
            }
            .tutorial-step-icon {
                width: 36px;
                height: 36px;
                font-size: 15px;
            }
            .tutorial-meta {
                padding-left: 0;
                gap: 8px;
            }
            .tutorial-meta .meta-item {
                font-size: 12px;
            }
            .subscribe-form {
                flex-direction: column;
            }
            .subscribe-form input[type="email"] {
                width: 100%;
                min-width: auto;
            }
            .subscribe-form button {
                width: 100%;
            }
            .driver-query-form .input-row {
                flex-direction: column;
            }
            .driver-query-form input[type="text"] {
                width: 100%;
                min-width: auto;
            }
            .driver-query-form .query-btn {
                width: 100%;
            }
            .filter-btn {
                font-size: 12px;
                padding: 6px 12px;
            }
        }

/* roulang page: category2 */
:root {
            --cherry: #C93636;
            --cherry-hover: #A92B2B;
            --cherry-light: #FBEAEA;
            --ink: #22262E;
            --ink-soft: #5D6673;
            --ink-mute: #8A94A3;
            --bg: #F5F6F8;
            --card: #FFFFFF;
            --line: #E5E8EE;
            --line-soft: #EDEFF4;
            --red-win: #E23D3D;
            --green-win: #3DAA5B;
            --blue-win: #2F6FED;
            --yellow-win: #F0B429;
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-pill: 999px;
            --shadow-card: 0 10px 28px rgba(26,28,34,0.06);
            --shadow-hover: 0 16px 40px rgba(201,54,54,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
            --font-mono: SFMono-Regular, Consolas, monospace;
            --container: 1200px;
            --nav-height: 64px;
            --section-pad-desktop: 72px;
            --section-pad-mobile: 44px;
            --transition: 0.22s ease;
        }

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

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

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

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

        a {
            color: var(--cherry);
            text-decoration: underline;
            transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
        }

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

        a:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

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

        button:focus-visible,
        input:focus-visible,
        select:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
        }

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

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: #fff;
            border-bottom: 1px solid var(--line);
            border-top: 3px solid var(--cherry);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }

        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--ink);
            text-decoration: none;
            white-space: nowrap;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

        .logo:hover {
            color: var(--cherry);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }

        .main-nav a {
            color: var(--ink);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: color var(--transition), background var(--transition);
        }

        .main-nav a:hover {
            color: var(--cherry);
            background: var(--cherry-light);
        }

        .main-nav a.active {
            color: var(--cherry);
            font-weight: 700;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            background: var(--cherry);
            border-radius: 2px;
        }

        .nav-cta {
            background: var(--cherry);
            color: #fff;
            text-decoration: none;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: background var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .nav-cta:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }

        .nav-cta:active {
            transform: translateY(1px);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            border-radius: 8px;
        }

        .nav-toggle span {
            width: 26px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: all var(--transition);
            display: block;
        }

        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== BREADCRUMB & PAGE H1 ========== */
        .page-hero-slim {
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 24px 0 20px;
        }

        .breadcrumb {
            font-size: 14px;
            color: var(--ink-mute);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--ink-soft);
            text-decoration: none;
        }

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

        .breadcrumb .sep {
            color: var(--ink-mute);
            user-select: none;
        }

        .page-hero-slim h1 {
            font-size: 30px;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 6px;
            line-height: 1.35;
        }

        .page-hero-slim .subtitle {
            font-size: 15px;
            color: var(--ink-soft);
            max-width: 720px;
            line-height: 1.7;
            margin: 0;
        }

        /* ========== VERSION TABS ========== */
        .version-tabs-section {
            padding: 32px 0 0;
            background: #fff;
        }

        .version-tabs {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .version-tab {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 18px;
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-pill);
            font-size: 14px;
            font-weight: 600;
            color: var(--ink-soft);
            text-decoration: none;
            transition: all var(--transition);
        }

        .version-tab:hover {
            border-color: var(--cherry);
            color: var(--cherry);
            background: var(--cherry-light);
        }

        .version-tab:focus-visible {
            outline: 2px solid rgba(201,54,54,0.22);
            outline-offset: 2px;
        }

        /* ========== ROW CARD LIST ========== */
        .list-section {
            background: #fff;
            padding: 28px 0 64px;
        }

        .section-heading {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 16px;
            margin-bottom: 24px;
            flex-wrap: wrap;
        }

        .section-heading h2 {
            font-size: 24px;
            font-weight: 800;
            color: var(--ink);
            margin: 0;
            line-height: 1.4;
        }

        .section-heading .hint {
            font-size: 13px;
            color: var(--ink-mute);
        }

        .row-card-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .row-card {
            display: flex;
            gap: 18px;
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            transition: all var(--transition);
            align-items: center;
            text-decoration: none;
            color: var(--ink);
            position: relative;
        }

        .row-card:hover {
            border-color: var(--cherry);
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
            color: var(--ink);
        }

        .row-card .card-icon {
            flex: 0 0 52px;
            width: 52px;
            height: 52px;
            background: var(--cherry-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 800;
            color: var(--cherry);
        }

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

        .row-card .card-info h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 4px;
            line-height: 1.45;
            transition: color var(--transition);
        }

        .row-card:hover .card-info h3 {
            color: var(--cherry);
        }

        .row-card .card-info p {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0;
            line-height: 1.6;
        }

        .row-card .card-meta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--ink-mute);
            margin-top: 6px;
        }

        .row-card .card-meta span {
            white-space: nowrap;
        }

        .row-card .card-action {
            flex: 0 0 auto;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 8px 16px;
            background: var(--cherry);
            color: #fff;
            border-radius: 8px;
            font-size: 13px;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition);
            white-space: nowrap;
        }

        .row-card .card-action:hover {
            background: var(--cherry-hover);
            color: #fff;
            transform: translateY(-1px);
        }

        .more-link-wrap {
            margin-top: 24px;
            text-align: center;
        }

        .more-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 15px;
            font-weight: 600;
            color: var(--cherry);
            text-decoration: none;
            padding: 6px 4px;
        }

        .more-link:hover {
            color: var(--cherry-hover);
            text-decoration: underline;
        }

        /* ========== COMPARE PANEL ========== */
        .compare-section {
            background: var(--bg);
            padding: 64px 0;
        }

        .compare-panel {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-top: 28px;
        }

        .compare-col {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-card);
        }

        .compare-col.compare-pro {
            border-top: 4px solid var(--blue-win);
        }

        .compare-col.compare-lite {
            border-top: 4px solid var(--green-win);
        }

        .compare-col h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 4px;
        }

        .compare-col .compare-desc {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0 0 16px;
        }

        .compare-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .compare-col ul li {
            font-size: 14px;
            color: var(--ink-soft);
            padding: 8px 0;
            border-bottom: 1px solid var(--line-soft);
            display: flex;
            align-items: flex-start;
            gap: 8px;
            line-height: 1.6;
        }

        .compare-col ul li:last-child {
            border-bottom: none;
        }

        .compare-col ul li::before {
            content: '✓';
            font-weight: 700;
            color: var(--green-win);
            flex: 0 0 18px;
        }

        .compare-col.compare-lite ul li::before {
            color: var(--cherry);
        }

        /* ========== CONFIG SUGGESTIONS ========== */
        .upgrade-section {
            background: #fff;
            padding: 64px 0;
        }

        .config-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 24px;
        }

        .config-row {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 18px;
            background: var(--bg);
            border-radius: 10px;
            border: 1px solid var(--line-soft);
            transition: all var(--transition);
            flex-wrap: wrap;
        }

        .config-row:hover {
            border-color: var(--cherry);
            background: var(--cherry-light);
        }

        .config-row .config-level {
            flex: 0 0 64px;
            background: var(--cherry);
            color: #fff;
            font-size: 13px;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 6px;
            text-align: center;
        }

        .config-row .config-detail {
            flex: 1;
            min-width: 200px;
        }

        .config-row .config-detail strong {
            font-size: 15px;
            color: var(--ink);
            display: block;
        }

        .config-row .config-detail span {
            font-size: 13px;
            color: var(--ink-mute);
        }

        .config-row .config-link {
            font-size: 13px;
            font-weight: 600;
            text-decoration: none;
            color: var(--cherry);
            padding: 6px 8px;
            white-space: nowrap;
        }

        .config-row .config-link:hover {
            color: var(--cherry-hover);
            text-decoration: underline;
        }

        /* ========== TUTORIAL CARDS ========== */
        .tutorial-section {
            background: var(--bg);
            padding: 64px 0;
        }

        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 24px;
        }

        .tutorial-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            text-decoration: none;
            color: var(--ink);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .tutorial-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--cherry);
            color: var(--ink);
        }

        .tutorial-card .tutorial-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            background: #EFF1F5;
            border-bottom: 1px solid var(--line-soft);
        }

        .tutorial-card .tutorial-body {
            padding: 18px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .tutorial-card .tutorial-body h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 6px;
            line-height: 1.5;
            transition: color var(--transition);
        }

        .tutorial-card:hover .tutorial-body h3 {
            color: var(--cherry);
        }

        .tutorial-card .tutorial-body p {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0 0 12px;
            line-height: 1.6;
            flex: 1;
        }

        .tutorial-card .tutorial-meta {
            font-size: 13px;
            color: var(--ink-mute);
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .tutorial-card .tutorial-meta .read-time {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: #fff;
            padding: 64px 0;
        }

        .faq-list {
            max-width: 800px;
            margin: 24px auto 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

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

        .faq-item.open {
            border-color: var(--cherry);
            box-shadow: 0 8px 20px rgba(201,54,54,0.08);
        }

        .faq-item .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 14px 18px;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            cursor: pointer;
            transition: color var(--transition), background var(--transition);
        }

        .faq-item .faq-question:hover {
            color: var(--cherry);
            background: var(--cherry-light);
        }

        .faq-item .faq-question .faq-icon {
            flex: 0 0 24px;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--cherry-light);
            color: var(--cherry);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            transition: transform var(--transition);
            line-height: 1;
        }

        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
        }

        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 18px;
        }

        .faq-item.open .faq-answer {
            max-height: 220px;
            padding: 0 18px 16px;
        }

        .faq-item .faq-answer p {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0;
            line-height: 1.7;
        }

        .faq-item .faq-answer a {
            font-weight: 600;
        }

        /* ========== CTA / SUBSCRIBE ========== */
        .cta-section {
            background: var(--bg);
            padding: 64px 0;
        }

        .cta-panel {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            padding: 40px 32px;
            text-align: center;
            box-shadow: var(--shadow-card);
            max-width: 720px;
            margin: 0 auto;
        }

        .cta-panel h2 {
            font-size: 22px;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.4;
        }

        .cta-panel p {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 0 0 20px;
            line-height: 1.7;
        }

        .cta-form {
            display: flex;
            gap: 10px;
            max-width: 460px;
            margin: 0 auto;
        }

        .cta-form input {
            flex: 1;
            height: 44px;
            border-radius: var(--radius-sm);
            border: 1px solid #D8DDE5;
            background: #fff;
            padding: 0 14px;
            font-size: 15px;
            color: var(--ink);
            transition: border-color var(--transition), box-shadow var(--transition);
            min-width: 0;
        }

        .cta-form input:focus {
            border-color: var(--cherry);
            box-shadow: 0 0 0 3px rgba(201,54,54,0.14);
            outline: none;
        }

        .cta-form button {
            height: 44px;
            padding: 0 22px;
            background: var(--cherry);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            transition: all var(--transition);
            white-space: nowrap;
        }

        .cta-form button:hover {
            background: var(--cherry-hover);
            transform: translateY(-1px);
        }

        .cta-form button:active {
            transform: translateY(1px);
        }

        .back-home {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--ink-soft);
            text-decoration: none;
        }

        .back-home:hover {
            color: var(--cherry);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--ink);
            color: #B8BEC8;
            padding: 52px 0 20px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .footer-brand .footer-logo {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            text-decoration: none;
            display: inline-block;
            margin-bottom: 12px;
        }

        .footer-brand .footer-logo:hover {
            color: #FF8C8C;
        }

        .footer-brand p {
            font-size: 14px;
            color: #9AA4B2;
            line-height: 1.7;
            margin: 0;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
            letter-spacing: 0.5px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: #B8BEC8;
            text-decoration: none;
            transition: color var(--transition);
        }

        .footer-col ul li a:hover {
            color: #FF8C8C;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            padding-top: 18px;
            font-size: 13px;
            color: #7A8494;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .main-nav a {
                padding: 6px 10px;
                font-size: 13px;
            }
            .nav-cta {
                padding: 8px 16px;
                font-size: 13px;
            }
            .tutorial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                gap: 0;
                padding: 12px 20px;
                border-bottom: 1px solid var(--line);
                box-shadow: 0 16px 30px rgba(26,28,34,0.08);
                align-items: stretch;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 10px;
                font-size: 15px;
                border-bottom: 1px solid var(--line-soft);
                border-radius: 0;
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .main-nav a.active::after {
                display: none;
            }
            .main-nav a.active {
                background: var(--cherry-light);
                border-left: 3px solid var(--cherry);
                padding-left: 12px;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-cta {
                display: none;
            }
            .compare-panel {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .tutorial-grid {
                grid-template-columns: 1fr;
            }
            .row-card {
                flex-wrap: wrap;
                gap: 12px;
            }
            .row-card .card-action {
                width: 100%;
                justify-content: center;
            }
            .cta-form {
                flex-direction: column;
            }
            .cta-form button {
                width: 100%;
            }
            .page-hero-slim h1 {
                font-size: 24px;
            }
            .section-heading h2 {
                font-size: 20px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-hero-slim {
                padding: 18px 0 14px;
            }
            .page-hero-slim h1 {
                font-size: 21px;
            }
            .version-tabs-section,
            .list-section,
            .compare-section,
            .upgrade-section,
            .tutorial-section,
            .faq-section,
            .cta-section {
                padding: 32px 0;
            }
            .config-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .config-row .config-level {
                flex: 0 0 auto;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 6px;
                text-align: center;
            }
            .footer-brand {
                text-align: center;
            }
            .footer-col {
                text-align: center;
            }
        }