/* roulang page: index */
:root {
            --primary: #0E2A24;
            --primary-dark: #091D18;
            --accent: #C8F04A;
            --emphasis: #FF7A30;
            --bg: #F5F7F2;
            --card-bg: #FFFFFF;
            --section-alt: #EDF2EC;
            --text-main: #17211E;
            --text-secondary: #5B6B64;
            --text-muted: #8B9991;
            --border: #E3EAE4;
            --radius-card: 12px;
            --radius-btn: 10px;
            --radius-tag: 6px;
            --radius-img: 8px;
            --shadow-sm: 0 8px 24px rgba(14,42,36,0.06);
            --shadow-md: 0 12px 32px rgba(14,42,36,0.12);
            --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-num: 'Inter', 'Roboto', sans-serif;
            --container: 1200px;
            --section-space: 80px;
            --gap: 24px;
        }

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

        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-cn);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

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

        button, input {
            font-family: var(--font-cn);
            font-size: 15px;
        }

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

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--primary-dark);
            border-bottom: 1px solid rgba(200,240,74,0.15);
            box-shadow: 0 2px 16px rgba(14,42,36,0.2);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .logo-icon svg {
            width: 20px;
            height: 20px;
            fill: var(--primary);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }

        .nav-desktop a {
            color: rgba(255,255,255,0.82);
            font-size: 14.5px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .nav-desktop a:hover {
            color: #fff;
            background: rgba(200,240,74,0.12);
        }

        .nav-desktop a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.1);
            position: relative;
        }

        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }

        .header-cta {
            flex-shrink: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 14.5px;
            padding: 11px 22px;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

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

        .btn-primary:hover {
            background: var(--emphasis);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255,122,48,0.3);
        }

        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
        }

        .btn-outline-light:hover {
            background: #fff;
            color: var(--primary);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 13.5px;
        }

        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }

        .btn:focus-visible, a:focus-visible, button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

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

        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        .mobile-menu {
            display: none;
            background: var(--primary-dark);
            padding: 12px 24px 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }

        .mobile-menu a {
            display: block;
            color: rgba(255,255,255,0.85);
            padding: 12px 8px;
            font-size: 15px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            transition: all 0.2s ease;
        }

        .mobile-menu a:hover {
            color: var(--accent);
            padding-left: 16px;
        }

        .mobile-menu a.active {
            color: var(--accent);
        }

        /* Sections */
        section {
            padding: var(--section-space) 0;
        }

        .section-title {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 40px;
            max-width: 720px;
            line-height: 1.75;
        }

        .section-title-row {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 40px;
        }

        .section-title-row .section-title {
            margin-bottom: 0;
        }

        .link-more {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            white-space: nowrap;
        }

        .link-more:hover {
            color: var(--emphasis);
        }

        /* Version ribbon */
        .version-ribbon {
            background: var(--primary);
            color: #fff;
            padding: 10px 0;
            font-size: 13.5px;
        }

        .version-ribbon-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
        }

        .version-ribbon .badge {
            background: var(--emphasis);
            color: #fff;
            font-size: 12px;
            font-weight: 700;
            padding: 3px 10px;
            border-radius: var(--radius-tag);
            letter-spacing: 0.3px;
        }

        .version-ribbon a {
            color: var(--accent);
            font-weight: 600;
            font-size: 13px;
        }

        .version-ribbon a:hover {
            color: #fff;
        }

        /* Hero */
        .hero {
            background: linear-gradient(135deg, #081B17 0%, #0E2A24 55%, #153A31 100%);
            color: #fff;
            padding: 72px 0 80px;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(200,240,74,0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -160px;
            left: -60px;
            width: 380px;
            height: 380px;
            background: radial-gradient(circle, rgba(255,122,48,0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

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

        .hero-content h1 {
            font-size: clamp(32px, 5vw, 48px);
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }

        .hero-content .hero-subtitle {
            font-size: 16.5px;
            color: rgba(255,255,255,0.8);
            line-height: 1.75;
            margin-bottom: 32px;
            max-width: 540px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 36px;
        }

        .hero-data {
            display: flex;
            gap: 28px;
            flex-wrap: wrap;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.15);
        }

        .hero-data-item {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .hero-data-item .data-label {
            font-size: 12.5px;
            color: rgba(255,255,255,0.6);
        }

        .hero-data-item .data-value {
            font-size: 16px;
            font-weight: 700;
            color: var(--accent);
            font-family: var(--font-num);
        }

        .hero-visual {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: 0 24px 48px rgba(0,0,0,0.3);
            border: 1px solid rgba(255,255,255,0.12);
            background: var(--primary-dark);
        }

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

        /* Quick download */
        .quick-download {
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
        }

        .quick-download-inner {
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 32px;
            align-items: center;
        }

        .quick-download-text h2 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .quick-download-text p {
            color: var(--text-secondary);
            font-size: 14.5px;
            margin-bottom: 16px;
        }

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

        .version-tag {
            display: inline-block;
            padding: 6px 14px;
            background: var(--section-alt);
            color: var(--primary);
            border-radius: var(--radius-tag);
            font-size: 13px;
            font-weight: 600;
            border: 1px solid var(--border);
            transition: all 0.2s ease;
            cursor: default;
        }

        .version-tag:hover {
            border-color: var(--accent);
            background: #F0F5E8;
        }

        .quick-download-actions {
            display: flex;
            gap: 14px;
            align-items: center;
            flex-wrap: wrap;
        }

        .security-note {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 12px;
        }

        .security-note svg {
            width: 16px;
            height: 16px;
            fill: var(--primary);
            flex-shrink: 0;
        }

        /* Trust indicators */
        .trust-indicators {
            background: var(--section-alt);
            padding: 40px 0;
        }

        .trust-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .trust-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 20px;
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            transition: all 0.25s ease;
        }

        .trust-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }

        .trust-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: var(--section-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .trust-icon svg {
            width: 22px;
            height: 22px;
            fill: var(--primary);
        }

        .trust-text {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-main);
        }

        .trust-text small {
            display: block;
            font-weight: 400;
            color: var(--text-muted);
            font-size: 12.5px;
            margin-top: 2px;
        }

        /* Category matrix */
        .category-matrix {
            background: var(--bg);
        }

        .matrix-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }

        .matrix-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 28px 24px;
            transition: all 0.25s ease;
            display: block;
            text-decoration: none;
            color: var(--text-main);
        }

        .matrix-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .matrix-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .matrix-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .matrix-card .matrix-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: var(--section-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }

        .matrix-card .matrix-icon svg {
            width: 24px;
            height: 24px;
            fill: var(--primary);
        }

        /* Feature highlights */
        .feature-highlights {
            background: var(--section-alt);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap);
        }

        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 26px 24px;
            display: flex;
            gap: 16px;
            align-items: flex-start;
            transition: all 0.25s ease;
        }

        .feature-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
        }

        .feature-card .feature-icon {
            width: 46px;
            height: 46px;
            border-radius: 10px;
            background: var(--section-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .feature-card .feature-icon svg {
            width: 22px;
            height: 22px;
            fill: var(--primary);
        }

        .feature-card h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* Steps */
        .install-steps {
            background: var(--bg);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }

        .step-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 28px 24px;
            text-align: center;
            transition: all 0.25s ease;
        }

        .step-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
            transform: translateY(-4px);
        }

        .step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--accent);
            font-size: 22px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-family: var(--font-num);
        }

        .step-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .step-card p {
            font-size: 13.5px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Scene cards */
        .scene-cards {
            background: var(--section-alt);
        }

        .scene-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }

        .scene-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 22px 20px;
            text-align: center;
            transition: all 0.25s ease;
            display: block;
            text-decoration: none;
            color: var(--text-main);
        }

        .scene-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
            transform: translateY(-4px);
        }

        .scene-card .scene-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            background: var(--section-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
        }

        .scene-card .scene-icon svg {
            width: 24px;
            height: 24px;
            fill: var(--primary);
        }

        .scene-card h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
        }

        /* Version comparison */
        .version-compare {
            background: var(--bg);
        }

        .compare-table-wrap {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }

        .compare-table th, .compare-table td {
            padding: 16px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border);
        }

        .compare-table thead th {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            white-space: nowrap;
        }

        .compare-table thead th:nth-child(2) {
            background: #1A4035;
        }

        .compare-table tbody tr:hover {
            background: #FAFCF8;
        }

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

        .compare-table .check {
            color: var(--primary);
            font-weight: 700;
        }

        .compare-table .partial {
            color: var(--emphasis);
            font-weight: 600;
        }

        /* CMS News */
        .cms-news {
            background: var(--section-alt);
        }

        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }

        .news-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all 0.25s ease;
            display: flex;
            flex-direction: column;
        }

        .news-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .news-card .news-img {
            aspect-ratio: 16/9;
            background: var(--section-alt);
            overflow: hidden;
            position: relative;
        }

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

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

        .news-card .news-tag {
            display: inline-block;
            padding: 4px 10px;
            background: var(--section-alt);
            color: var(--primary);
            border-radius: var(--radius-tag);
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
            cursor: default;
            align-self: flex-start;
        }

        .news-card h3 {
            font-size: 15.5px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 8px;
        }

        .news-card h3 a {
            color: var(--text-main);
            transition: color 0.2s ease;
        }

        .news-card h3 a:hover {
            color: var(--emphasis);
        }

        .news-card .news-excerpt {
            font-size: 13.5px;
            color: var(--text-secondary);
            line-height: 1.65;
            flex: 1;
            margin-bottom: 12px;
        }

        .news-card .news-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 12.5px;
            color: var(--text-muted);
        }

        .news-card .news-meta a {
            font-weight: 600;
            color: var(--primary);
            font-size: 13px;
        }

        .news-card .news-meta a:hover {
            color: var(--emphasis);
        }

        .news-empty {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px dashed var(--border);
            padding: 48px 24px;
            text-align: center;
            color: var(--text-muted);
            font-size: 15px;
        }

        /* Testimonials */
        .testimonials {
            background: var(--bg);
        }

        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }

        .testimonial-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 24px;
            transition: all 0.25s ease;
        }

        .testimonial-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
        }

        .testimonial-head {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
        }

        .testimonial-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
            flex-shrink: 0;
        }

        .testimonial-nick {
            font-weight: 600;
            font-size: 14.5px;
            color: var(--text-main);
        }

        .testimonial-stars {
            color: var(--emphasis);
            font-size: 14px;
            letter-spacing: 2px;
        }

        .testimonial-text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Security */
        .security-section {
            background: var(--primary);
            color: #fff;
        }

        .security-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .security-text h2 {
            color: #fff;
            font-size: clamp(24px, 3vw, 30px);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .security-text p {
            color: rgba(255,255,255,0.78);
            font-size: 15px;
            line-height: 1.75;
            margin-bottom: 20px;
        }

        .security-text a {
            color: var(--accent);
            font-weight: 600;
        }

        .security-text a:hover {
            color: #fff;
        }

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

        .security-item {
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.14);
            border-radius: var(--radius-card);
            padding: 18px 20px;
            display: flex;
            align-items: center;
            gap: 14px;
            transition: all 0.25s ease;
        }

        .security-item:hover {
            background: rgba(255,255,255,0.12);
            border-color: rgba(200,240,74,0.3);
        }

        .security-item .sec-icon {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background: rgba(200,240,74,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .security-item .sec-icon svg {
            width: 20px;
            height: 20px;
            fill: var(--accent);
        }

        .security-item h3 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
        }

        .security-item p {
            font-size: 13px;
            color: rgba(255,255,255,0.65);
        }

        /* FAQ */
        .faq-section {
            background: var(--section-alt);
        }

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

        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all 0.25s ease;
        }

        .faq-item:hover {
            border-color: var(--accent);
        }

        .faq-question {
            width: 100%;
            background: transparent;
            border: none;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
            text-align: left;
            min-height: 56px;
            transition: background 0.2s ease;
            font-family: var(--font-cn);
        }

        .faq-question:hover {
            background: #F8FBF6;
        }

        .faq-question .faq-arrow {
            width: 22px;
            height: 22px;
            flex-shrink: 0;
            transition: transform 0.3s ease;
            color: var(--text-muted);
        }

        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 22px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 18px;
        }

        .faq-answer p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Subscribe CTA */
        .subscribe-section {
            background: var(--accent);
            padding: 56px 0;
        }

        .subscribe-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
        }

        .subscribe-text h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .subscribe-text p {
            font-size: 15px;
            color: var(--primary);
            opacity: 0.75;
        }

        .subscribe-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .subscribe-form input {
            flex: 1;
            min-width: 200px;
            height: 48px;
            padding: 0 18px;
            border: 2px solid var(--primary);
            border-radius: var(--radius-btn);
            font-size: 15px;
            background: #fff;
            color: var(--text-main);
            transition: all 0.25s ease;
            outline: none;
        }

        .subscribe-form input:focus {
            border-color: var(--emphasis);
            box-shadow: 0 0 0 4px rgba(255,122,48,0.15);
        }

        .subscribe-form .btn-primary {
            height: 48px;
            padding: 0 28px;
            border: 2px solid var(--primary);
        }

        .subscribe-form .btn-primary:hover {
            border-color: var(--emphasis);
        }

        .subscribe-success {
            display: none;
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(255,255,255,0.5);
            padding: 14px 22px;
            border-radius: var(--radius-btn);
        }

        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.75);
            padding: 56px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }

        .footer-brand .logo-text {
            font-size: 18px;
            margin-bottom: 10px;
        }

        .footer-brand p {
            font-size: 13.5px;
            color: rgba(255,255,255,0.55);
            line-height: 1.65;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            font-size: 13.5px;
            padding: 5px 0;
            transition: all 0.2s ease;
        }

        .footer-col a:hover {
            color: var(--accent);
            padding-left: 6px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            font-size: 13px;
            color: rgba(255,255,255,0.45);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --section-space: 60px;
            }
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .hero-content {
                text-align: center;
            }
            .hero-content .hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-actions {
                justify-content: center;
            }
            .hero-data {
                justify-content: center;
            }
            .quick-download-inner {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .quick-download-actions {
                justify-content: center;
            }
            .version-tags {
                justify-content: center;
            }
            .security-note {
                justify-content: center;
            }
            .trust-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .matrix-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scene-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: 1fr;
            }
            .security-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .subscribe-inner {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .subscribe-form {
                justify-content: center;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-space: 48px;
                --gap: 16px;
            }
            .nav-desktop {
                display: none;
            }
            .header-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .mobile-menu {
                display: block;
            }
            .mobile-menu.show {
                display: block;
            }
            .hero {
                padding: 48px 0 56px;
            }
            .matrix-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .scene-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .trust-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .section-title-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
            .compare-table-wrap {
                overflow-x: auto;
            }
            .compare-table {
                min-width: 560px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 16px;
            }
            .hero-content h1 {
                font-size: 28px;
            }
            .hero-actions .btn {
                padding: 10px 18px;
                font-size: 13.5px;
            }
            .quick-download-actions {
                flex-direction: column;
                width: 100%;
            }
            .quick-download-actions .btn {
                width: 100%;
            }
            .subscribe-form {
                flex-direction: column;
                width: 100%;
            }
            .subscribe-form input {
                width: 100%;
            }
            .subscribe-form .btn-primary {
                width: 100%;
                justify-content: center;
            }
        }

/* roulang page: article */
:root {
            --primary: #0E2A24;
            --primary-dark: #091D18;
            --accent: #C8F04A;
            --emphasis: #FF7A30;
            --bg: #F5F7F2;
            --card-bg: #FFFFFF;
            --section-alt: #EDF2EC;
            --text-main: #17211E;
            --text-secondary: #5B6B64;
            --text-muted: #8B9991;
            --border: #E3EAE4;
            --radius-card: 12px;
            --radius-btn: 10px;
            --radius-tag: 6px;
            --radius-img: 8px;
            --shadow-sm: 0 8px 24px rgba(14,42,36,0.06);
            --shadow-md: 0 12px 32px rgba(14,42,36,0.12);
            --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-num: 'Inter', 'Roboto', sans-serif;
            --container: 1200px;
            --section-space: 60px;
            --gap: 24px;
            --article-max: 860px;
        }
        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-cn);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--emphasis);
        }
        button, input {
            font-family: var(--font-cn);
            font-size: 15px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        .article-container {
            max-width: var(--article-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--primary-dark);
            border-bottom: 1px solid rgba(200,240,74,0.15);
            box-shadow: 0 2px 16px rgba(14,42,36,0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .logo-icon svg {
            width: 20px;
            height: 20px;
            fill: var(--primary);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }
        .nav-desktop a {
            color: rgba(255,255,255,0.82);
            font-size: 14.5px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }
        .nav-desktop a:hover {
            color: #fff;
            background: rgba(200,240,74,0.12);
        }
        .nav-desktop a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.1);
            position: relative;
        }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }
        .header-cta {
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 14.5px;
            padding: 11px 22px;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--emphasis);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255,122,48,0.3);
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
        }
        .btn-outline-light:hover {
            background: #fff;
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 13.5px;
        }
        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }
        .btn:focus-visible, a:focus-visible, button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .nav-toggle {
            display: none;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            flex-direction: column;
            gap: 5px;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }
        .mobile-menu {
            display: none;
            background: var(--primary-dark);
            border-top: 1px solid rgba(200,240,74,0.15);
            padding: 12px 24px 20px;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            color: rgba(255,255,255,0.82);
            font-size: 15px;
            font-weight: 500;
            padding: 12px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
        }
        .mobile-menu a:hover {
            color: #fff;
            background: rgba(200,240,74,0.12);
        }
        .mobile-menu a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.1);
        }
        .main {
            min-height: 70vh;
            padding: 48px 0 72px;
        }
        .article-section {
            padding: 0;
            margin-bottom: 0;
        }
        .article-header-section {
            padding: 40px 0 20px;
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13.5px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .breadcrumb-nav a {
            color: var(--text-secondary);
            transition: color 0.2s ease;
        }
        .breadcrumb-nav a:hover {
            color: var(--emphasis);
        }
        .breadcrumb-nav .separator {
            color: var(--text-muted);
            user-select: none;
        }
        .breadcrumb-nav .current {
            color: var(--text-main);
            font-weight: 600;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 300px;
        }
        .article-title {
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            margin: 0 0 16px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 13.5px;
            color: var(--text-muted);
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 20px;
        }
        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-category {
            background: var(--section-alt);
            color: var(--primary);
            padding: 4px 12px;
            border-radius: var(--radius-tag);
            font-weight: 600;
            font-size: 12.5px;
        }
        .article-excerpt {
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--text-secondary);
            background: var(--card-bg);
            border-left: 4px solid var(--accent);
            border-radius: 0 var(--radius-card) var(--radius-card) 0;
            padding: 20px 24px;
            margin: 0 0 32px;
            box-shadow: var(--shadow-sm);
        }
        .article-cover {
            border-radius: var(--radius-img);
            overflow: hidden;
            margin: 0 0 32px;
            box-shadow: var(--shadow-sm);
        }
        .article-cover img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .article-content-section {
            padding: 0;
            margin-bottom: 40px;
        }
        .article-content {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 40px 44px;
            box-shadow: var(--shadow-sm);
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-main);
        }
        .article-content h2 {
            font-size: 24px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--primary);
            margin: 32px 0 16px;
            padding-left: 14px;
            border-left: 4px solid var(--accent);
        }
        .article-content h3 {
            font-size: 19px;
            font-weight: 600;
            line-height: 1.5;
            color: var(--text-main);
            margin: 24px 0 12px;
        }
        .article-content p {
            margin: 0 0 16px;
        }
        .article-content ul,
        .article-content ol {
            padding-left: 24px;
            margin: 0 0 16px;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content blockquote {
            background: var(--section-alt);
            border-left: 3px solid var(--accent);
            border-radius: 0 var(--radius-card) var(--radius-card) 0;
            padding: 16px 20px;
            margin: 20px 0;
            color: var(--text-secondary);
            font-size: 15px;
        }
        .article-content img {
            border-radius: var(--radius-img);
            margin: 20px auto;
            box-shadow: var(--shadow-sm);
        }
        .article-content pre {
            background: var(--primary-dark);
            color: #e0e8e4;
            border-radius: var(--radius-card);
            padding: 20px 24px;
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.6;
            margin: 20px 0;
        }
        .article-content code {
            background: var(--section-alt);
            color: var(--text-main);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 14px;
            font-family: 'Courier New', monospace;
        }
        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }
        .empty-state {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 60px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        .empty-state p {
            font-size: 18px;
            color: var(--text-secondary);
            margin: 0 0 24px;
        }
        .download-cta-card {
            background: var(--primary);
            border-radius: var(--radius-card);
            padding: 36px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
            margin: 24px 0 40px;
            box-shadow: var(--shadow-md);
        }
        .download-cta-card .cta-text h3 {
            color: #fff;
            font-size: 22px;
            font-weight: 700;
            margin: 0 0 8px;
            line-height: 1.4;
        }
        .download-cta-card .cta-text p {
            color: rgba(255,255,255,0.75);
            font-size: 14.5px;
            margin: 0;
        }
        .download-cta-card .btn {
            flex-shrink: 0;
        }
        .related-section {
            padding: 0;
            margin-bottom: 40px;
        }
        .related-section .section-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            margin: 0 0 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section .section-title::before {
            content: '';
            width: 4px;
            height: 22px;
            background: var(--accent);
            border-radius: 2px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 20px;
        }
        .related-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .related-card .card-img {
            width: 100%;
            aspect-ratio: 16/10;
            overflow: hidden;
            background: var(--section-alt);
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .related-card .card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-title {
            font-size: 15.5px;
            font-weight: 600;
            color: var(--text-main);
            margin: 0 0 8px;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-title a {
            color: var(--text-main);
            transition: color 0.2s ease;
        }
        .related-card .card-title a:hover {
            color: var(--emphasis);
        }
        .related-card .card-meta {
            font-size: 12.5px;
            color: var(--text-muted);
            margin-top: auto;
        }
        .tags-section {
            padding: 0;
            margin-bottom: 32px;
        }
        .tags-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag-badge {
            display: inline-flex;
            align-items: center;
            background: var(--section-alt);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            padding: 6px 14px;
            border-radius: var(--radius-tag);
            transition: all 0.2s ease;
        }
        .tag-badge:hover {
            background: var(--accent);
            color: var(--primary);
        }
        .prev-next-section {
            padding: 0;
            margin-bottom: 32px;
        }
        .prev-next-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .prev-next-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 18px 22px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all 0.25s ease;
        }
        .prev-next-card:hover {
            border-color: var(--accent);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .prev-next-card .label {
            font-size: 12.5px;
            color: var(--text-muted);
            margin-bottom: 6px;
        }
        .prev-next-card a {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
            display: block;
            line-height: 1.5;
        }
        .prev-next-card a:hover {
            color: var(--emphasis);
        }
        .return-section {
            padding: 0;
            margin-bottom: 0;
        }
        .return-wrap {
            text-align: center;
            padding: 8px 0 0;
        }
        .site-footer {
            background: var(--primary-dark);
            border-top: 1px solid rgba(200,240,74,0.15);
            padding: 48px 0 32px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo-text {
            font-size: 22px;
            margin-bottom: 12px;
            display: block;
        }
        .footer-brand p {
            color: rgba(255,255,255,0.6);
            font-size: 14px;
            line-height: 1.7;
            margin: 0 0 0;
            max-width: 280px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin: 0 0 16px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            font-size: 13.5px;
            padding: 4px 0;
            transition: color 0.2s ease;
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 12.5px;
            color: rgba(255,255,255,0.45);
        }
        @media (max-width: 1024px) {
            :root {
                --section-space: 48px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-space: 40px;
                --gap: 16px;
            }
            .nav-desktop {
                display: none;
            }
            .header-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .main {
                padding: 32px 0 56px;
            }
            .article-content {
                padding: 24px 20px;
            }
            .article-content h2 {
                font-size: 20px;
            }
            .article-content h3 {
                font-size: 17px;
            }
            .download-cta-card {
                padding: 24px 20px;
                flex-direction: column;
                align-items: flex-start;
            }
            .download-cta-card .cta-text h3 {
                font-size: 19px;
            }
            .prev-next-grid {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .article-title {
                font-size: 26px;
            }
            .article-excerpt {
                padding: 16px 18px;
                font-size: 14.5px;
            }
            .breadcrumb-nav .current {
                max-width: 160px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 480px) {
            :root {
                --section-space: 32px;
            }
            .container {
                padding: 0 16px;
            }
            .article-container {
                padding: 0 16px;
            }
            .article-title {
                font-size: 22px;
            }
            .article-meta {
                gap: 10px;
                font-size: 12.5px;
            }
            .download-cta-card {
                padding: 20px 16px;
            }
            .download-cta-card .cta-text h3 {
                font-size: 17px;
            }
            .related-card .card-title {
                font-size: 14.5px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #0E2A24;
            --primary-dark: #091D18;
            --accent: #C8F04A;
            --emphasis: #FF7A30;
            --bg: #F5F7F2;
            --card-bg: #FFFFFF;
            --section-alt: #EDF2EC;
            --text-main: #17211E;
            --text-secondary: #5B6B64;
            --text-muted: #8B9991;
            --border: #E3EAE4;
            --radius-card: 12px;
            --radius-btn: 10px;
            --radius-tag: 6px;
            --radius-img: 8px;
            --shadow-sm: 0 8px 24px rgba(14,42,36,0.06);
            --shadow-md: 0 12px 32px rgba(14,42,36,0.12);
            --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-num: 'Inter', 'Roboto', sans-serif;
            --container: 1200px;
            --section-space: 70px;
            --gap: 24px;
        }
        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-cn);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--emphasis);
        }
        button, input {
            font-family: var(--font-cn);
            font-size: 15px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--primary-dark);
            border-bottom: 1px solid rgba(200,240,74,0.15);
            box-shadow: 0 2px 16px rgba(14,42,36,0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .logo-icon svg {
            width: 20px;
            height: 20px;
            fill: var(--primary);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }
        .nav-desktop a {
            color: rgba(255,255,255,0.82);
            font-size: 14.5px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }
        .nav-desktop a:hover {
            color: #fff;
            background: rgba(200,240,74,0.12);
        }
        .nav-desktop a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.1);
            position: relative;
        }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }
        .header-cta {
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 14.5px;
            padding: 11px 22px;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--emphasis);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255,122,48,0.3);
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
        }
        .btn-outline-light:hover {
            background: #fff;
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 13.5px;
        }
        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }
        .btn:focus-visible, a:focus-visible, button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .nav-toggle {
            display: none;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            flex-direction: column;
            gap: 5px;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 12px 24px 20px;
            background: var(--primary-dark);
            border-top: 1px solid rgba(200,240,74,0.12);
        }
        .mobile-menu a {
            color: rgba(255,255,255,0.82);
            padding: 10px 12px;
            border-radius: 8px;
            font-size: 15px;
            transition: all 0.2s ease;
        }
        .mobile-menu a:hover {
            background: rgba(200,240,74,0.1);
            color: #fff;
        }
        .mobile-menu a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.08);
        }
        .mobile-menu.show {
            display: flex;
        }

        /* Breadcrumb */
        .breadcrumb-wrapper {
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13.5px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb-nav a {
            color: var(--text-secondary);
        }
        .breadcrumb-nav a:hover {
            color: var(--emphasis);
        }
        .breadcrumb-nav .sep {
            color: #CBD5CF;
            user-select: none;
        }
        .breadcrumb-nav .current {
            color: var(--primary);
            font-weight: 600;
        }

        /* Page Header (not hero) */
        .page-header {
            background: linear-gradient(135deg, #F5F7F2 0%, #EDF2EC 60%, #E3EAE4 100%);
            padding: 44px 0 40px;
            border-bottom: 1px solid var(--border);
        }
        .page-header h1 {
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 700;
            line-height: 1.25;
            color: var(--primary);
            margin: 0 0 12px;
        }
        .page-header .lead {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            margin: 0;
            line-height: 1.75;
        }

        /* Section base */
        .section {
            padding: var(--section-space) 0;
        }
        .section-alt {
            background: var(--section-alt);
        }
        .section-white {
            background: #fff;
        }
        .section-title {
            font-size: clamp(22px, 2.6vw, 30px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .section-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            max-width: 640px;
            margin-bottom: 28px;
        }

        /* Parameter summary */
        .param-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 24px;
        }
        .param-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 16px 20px;
            min-width: 120px;
            flex: 1 1 140px;
            box-shadow: var(--shadow-sm);
            transition: all 0.25s ease;
        }
        .param-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
            transform: translateY(-2px);
        }
        .param-item .label {
            font-size: 12.5px;
            color: var(--text-muted);
            display: block;
            margin-bottom: 4px;
            font-weight: 500;
        }
        .param-item .value {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary);
            font-family: var(--font-num);
        }
        .param-item .value.small {
            font-size: 15px;
        }

        /* Image block */
        .img-cover {
            border-radius: var(--radius-img);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .img-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Scenario cards */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }
        .scenario-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 24px 20px;
            box-shadow: var(--shadow-sm);
            transition: all 0.25s ease;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
            transform: translateY(-4px);
        }
        .scenario-card .icon-box {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: rgba(200,240,74,0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            flex-shrink: 0;
        }
        .scenario-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--primary);
            margin: 0;
            line-height: 1.4;
        }
        .scenario-card p {
            font-size: 13.5px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.6;
        }
        .scenario-card a {
            font-size: 13.5px;
            font-weight: 600;
            color: var(--primary);
            margin-top: auto;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .scenario-card a:hover {
            color: var(--emphasis);
        }

        /* System check bar */
        .sys-check-bar {
            background: linear-gradient(135deg, var(--primary) 0%, #1A3D35 100%);
            border-radius: var(--radius-card);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
            color: #fff;
            box-shadow: var(--shadow-md);
        }
        .sys-check-bar .info h3 {
            font-size: 19px;
            font-weight: 700;
            margin: 0 0 6px;
            color: #fff;
        }
        .sys-check-bar .info p {
            font-size: 14px;
            color: rgba(255,255,255,0.75);
            margin: 0;
            line-height: 1.65;
        }
        .sys-check-bar .sys-tags {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .sys-check-bar .sys-tag {
            background: rgba(200,240,74,0.15);
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 20px;
            border: 1px solid rgba(200,240,74,0.3);
        }

        /* Steps */
        .steps {
            display: flex;
            flex-direction: column;
            gap: 0;
            position: relative;
            padding-left: 20px;
        }
        .steps::before {
            content: '';
            position: absolute;
            left: 6px;
            top: 10px;
            bottom: 10px;
            width: 2px;
            background: #D4DED8;
            border-radius: 1px;
        }
        .step-item {
            display: flex;
            gap: 20px;
            padding: 18px 0;
            position: relative;
        }
        .step-item .step-num {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--primary);
            font-weight: 700;
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            z-index: 1;
            margin-top: 2px;
        }
        .step-item .step-body h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 5px;
        }
        .step-item .step-body p {
            font-size: 14.5px;
            color: var(--text-secondary);
            margin: 0 0 6px;
            line-height: 1.7;
        }
        .step-item .step-body a {
            font-size: 13.5px;
            font-weight: 600;
            color: var(--primary);
        }
        .step-item .step-body a:hover {
            color: var(--emphasis);
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 0;
            overflow: hidden;
            transition: all 0.2s ease;
        }
        .faq-item:hover {
            border-color: var(--accent);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            background: transparent;
            border: none;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: background 0.2s ease;
        }
        .faq-question:hover {
            background: rgba(200,240,74,0.1);
        }
        .faq-question .arrow {
            font-size: 13px;
            color: var(--text-muted);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .arrow {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
        }
        .faq-answer-inner a {
            color: var(--primary);
            font-weight: 600;
        }
        .faq-answer-inner a:hover {
            color: var(--emphasis);
        }

        /* Download resource list */
        .dl-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .dl-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-sm);
            transition: all 0.25s ease;
        }
        .dl-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .dl-item .dl-info h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            margin: 0 0 3px;
        }
        .dl-item .dl-info .meta {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .dl-item .dl-info .meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .dl-item .dl-actions {
            display: flex;
            gap: 8px;
            flex-shrink: 0;
        }

        /* CTA */
        .cta-box {
            background: linear-gradient(135deg, var(--section-alt) 0%, #E3EAE4 100%);
            border-radius: var(--radius-card);
            padding: 36px 32px;
            text-align: center;
            border: 1px solid var(--border);
        }
        .cta-box h2 {
            font-size: clamp(20px, 2.4vw, 28px);
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 8px;
        }
        .cta-box p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0 0 24px;
        }
        .cta-box .btn-group {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.75);
            padding: 48px 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(200,240,74,0.12);
        }
        .footer-brand .logo-text {
            font-size: 21px;
            font-weight: 700;
            color: #fff;
            display: block;
            margin-bottom: 10px;
        }
        .footer-brand p {
            font-size: 13.5px;
            line-height: 1.7;
            color: rgba(255,255,255,0.6);
            margin: 0;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 14.5px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 12px;
        }
        .footer-col a {
            display: block;
            font-size: 13.5px;
            color: rgba(255,255,255,0.65);
            padding: 4px 0;
            transition: color 0.2s ease;
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            padding-top: 18px;
            font-size: 13px;
            color: rgba(255,255,255,0.5);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 2fr 1fr;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-space: 52px;
                --gap: 16px;
            }
            .nav-desktop {
                display: none;
            }
            .header-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .page-header {
                padding: 32px 0 28px;
            }
            .sys-check-bar {
                flex-direction: column;
                align-items: flex-start;
                padding: 22px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .dl-item {
                flex-direction: column;
                align-items: flex-start;
            }
            .dl-item .dl-actions {
                width: 100%;
            }
            .dl-item .dl-actions .btn {
                flex: 1;
            }
        }
        @media (max-width: 480px) {
            :root {
                --section-space: 40px;
                --gap: 12px;
            }
            .container {
                padding: 0 16px;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .page-header h1 {
                font-size: 24px;
            }
            .steps {
                padding-left: 12px;
            }
            .steps::before {
                left: 2px;
            }
            .step-item {
                gap: 14px;
            }
            .step-item .step-num {
                width: 26px;
                height: 26px;
                font-size: 12px;
            }
            .param-grid {
                gap: 10px;
            }
            .param-item {
                padding: 12px 14px;
                min-width: 100px;
                flex: 1 1 110px;
            }
            .param-item .value {
                font-size: 15px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #0E2A24;
            --primary-dark: #091D18;
            --accent: #C8F04A;
            --emphasis: #FF7A30;
            --bg: #F5F7F2;
            --card-bg: #FFFFFF;
            --section-alt: #EDF2EC;
            --text-main: #17211E;
            --text-secondary: #5B6B64;
            --text-muted: #8B9991;
            --border: #E3EAE4;
            --radius-card: 12px;
            --radius-btn: 10px;
            --radius-tag: 6px;
            --radius-img: 8px;
            --shadow-sm: 0 8px 24px rgba(14,42,36,0.06);
            --shadow-md: 0 12px 32px rgba(14,42,36,0.12);
            --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-num: 'Inter', 'Roboto', sans-serif;
            --container: 1200px;
            --section-space: 72px;
            --gap: 24px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-cn);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--emphasis);
        }
        button,
        input {
            font-family: var(--font-cn);
            font-size: 15px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--primary-dark);
            border-bottom: 1px solid rgba(200,240,74,0.15);
            box-shadow: 0 2px 16px rgba(14,42,36,0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .logo-icon svg {
            width: 20px;
            height: 20px;
            fill: var(--primary);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }
        .nav-desktop a {
            color: rgba(255,255,255,0.82);
            font-size: 14.5px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }
        .nav-desktop a:hover {
            color: #fff;
            background: rgba(200,240,74,0.12);
        }
        .nav-desktop a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.1);
            position: relative;
        }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }
        .header-cta {
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 14.5px;
            padding: 11px 22px;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--emphasis);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255,122,48,0.3);
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
        }
        .btn-outline-light:hover {
            background: #fff;
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 13.5px;
        }
        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }
        .btn:focus-visible,
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .nav-toggle {
            display: none;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            flex-direction: column;
            gap: 5px;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            background: var(--primary-dark);
            padding: 12px 24px 20px;
            border-top: 1px solid rgba(200,240,74,0.1);
        }
        .mobile-menu a {
            color: rgba(255,255,255,0.85);
            padding: 12px 0;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            font-size: 15px;
        }
        .mobile-menu a.active {
            color: var(--accent);
        }
        /* Section Common */
        .section {
            padding: var(--section-space) 0;
        }
        .section-alt {
            background: var(--section-alt);
        }
        .section-white {
            background: var(--card-bg);
        }
        .section-deep {
            background: var(--primary-dark);
            color: #fff;
        }
        /* Breadcrumb */
        .breadcrumb-row {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13.5px;
            color: var(--text-muted);
            margin-bottom: 16px;
            padding-top: 24px;
        }
        .breadcrumb-row a {
            color: var(--text-secondary);
        }
        .breadcrumb-row a:hover {
            color: var(--emphasis);
        }
        .breadcrumb-row .sep {
            color: var(--text-muted);
        }
        .breadcrumb-row .current {
            color: var(--primary);
            font-weight: 600;
        }
        /* Category Page Header */
        .cat-header {
            padding-bottom: 32px;
        }
        .cat-header h1 {
            font-size: clamp(26px, 3.5vw, 36px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .cat-header .lead {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }
        /* Tutorial Cards */
        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .tutorial-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .tutorial-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .tutorial-card .icon-wrap {
            width: 42px;
            height: 42px;
            background: var(--section-alt);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 6px;
        }
        .tutorial-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--primary);
            line-height: 1.4;
        }
        .tutorial-card p {
            font-size: 13.5px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
        }
        .tutorial-card .card-link {
            font-size: 13.5px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .tutorial-card .card-link:hover {
            color: var(--emphasis);
        }
        /* Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }
        .step-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            position: relative;
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
            transform: translateY(-3px);
        }
        .step-num {
            width: 36px;
            height: 36px;
            background: var(--accent);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
            margin-bottom: 12px;
            font-family: var(--font-num);
        }
        .step-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .step-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.65;
        }
        /* Media Tutorial */
        .media-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: var(--gap);
        }
        .media-main {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .media-main .thumb {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
            border-radius: var(--radius-card) var(--radius-card) 0 0;
        }
        .media-main .media-body {
            padding: 18px 22px;
        }
        .media-main .media-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .media-main .media-body p {
            font-size: 13.5px;
            color: var(--text-secondary);
        }
        .media-side {
            display: flex;
            flex-direction: column;
            gap: var(--gap);
        }
        .video-placeholder {
            background: var(--primary-dark);
            border-radius: var(--radius-card);
            aspect-ratio: 16/9;
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.75);
            box-shadow: var(--shadow-sm);
            position: relative;
            cursor: pointer;
            transition: all 0.3s ease;
            overflow: hidden;
        }
        .video-placeholder:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .video-placeholder .play-btn {
            width: 52px;
            height: 52px;
            background: var(--accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 24px;
            box-shadow: 0 8px 24px rgba(0,0,0,0.3);
        }
        .video-placeholder .video-label {
            position: absolute;
            bottom: 10px;
            left: 14px;
            right: 14px;
            font-size: 12px;
            color: rgba(255,255,255,0.75);
            text-align: center;
            background: rgba(0,0,0,0.4);
            padding: 4px 8px;
            border-radius: 4px;
        }
        /* FAQ Short */
        .faq-short-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-short-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 18px 22px;
            box-shadow: var(--shadow-sm);
            transition: all 0.25s ease;
        }
        .faq-short-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
        }
        .faq-short-item h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .faq-short-item p {
            font-size: 13.5px;
            color: var(--text-secondary);
            margin: 0;
        }
        /* Article List */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .article-list-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 20px 22px;
            box-shadow: var(--shadow-sm);
            transition: all 0.25s ease;
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }
        .article-list-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
        }
        .article-list-item .num {
            width: 32px;
            height: 32px;
            background: var(--section-alt);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            flex-shrink: 0;
            font-family: var(--font-num);
        }
        .article-list-item .info {
            flex: 1;
        }
        .article-list-item h3 {
            font-size: 15.5px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 4px;
            line-height: 1.4;
        }
        .article-list-item p {
            font-size: 13.5px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.6;
        }
        .article-list-item .meta {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 6px;
        }
        /* Bottom Guide */
        .guide-cta {
            background: var(--accent);
            border-radius: var(--radius-card);
            padding: 36px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .guide-cta .cta-text h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 4px;
        }
        .guide-cta .cta-text p {
            font-size: 14px;
            color: var(--primary);
            opacity: 0.75;
            margin: 0;
        }
        .guide-cta .cta-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.75);
            padding: 60px 0 30px;
            margin-top: var(--section-space);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2.2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand .logo-text {
            font-size: 22px;
            color: #fff;
            display: inline-block;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 13.5px;
            color: rgba(255,255,255,0.6);
            line-height: 1.7;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            font-size: 13.5px;
            padding: 5px 0;
            transition: color 0.2s ease;
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 12.5px;
            color: rgba(255,255,255,0.4);
        }
        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --section-space: 56px;
            }
            .tutorial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
                gap: 24px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-space: 40px;
                --gap: 16px;
            }
            .nav-desktop {
                display: none;
            }
            .header-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .mobile-menu.open {
                display: flex;
            }
            .tutorial-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .media-grid {
                grid-template-columns: 1fr;
            }
            .guide-cta {
                flex-direction: column;
                align-items: flex-start;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .article-list-item {
                flex-direction: column;
                gap: 8px;
            }
        }
        @media (max-width: 480px) {
            :root {
                --section-space: 32px;
                --gap: 12px;
            }
            .container {
                padding: 0 16px;
            }
            .logo-text {
                font-size: 17px;
            }
            .cat-header h1 {
                font-size: 22px;
            }
            .btn-lg {
                padding: 12px 20px;
                font-size: 14px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #0E2A24;
            --primary-dark: #091D18;
            --accent: #C8F04A;
            --emphasis: #FF7A30;
            --bg: #F5F7F2;
            --card-bg: #FFFFFF;
            --section-alt: #EDF2EC;
            --text-main: #17211E;
            --text-secondary: #5B6B64;
            --text-muted: #8B9991;
            --border: #E3EAE4;
            --radius-card: 12px;
            --radius-btn: 10px;
            --radius-tag: 6px;
            --radius-img: 8px;
            --shadow-sm: 0 8px 24px rgba(14,42,36,0.06);
            --shadow-md: 0 12px 32px rgba(14,42,36,0.12);
            --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-num: 'Inter', 'Roboto', sans-serif;
            --container: 1200px;
            --section-space: 80px;
            --gap: 24px;
        }

        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-cn);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

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

        button, input {
            font-family: var(--font-cn);
            font-size: 15px;
        }

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

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--primary-dark);
            border-bottom: 1px solid rgba(200,240,74,0.15);
            box-shadow: 0 2px 16px rgba(14,42,36,0.2);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .logo-icon svg {
            width: 20px;
            height: 20px;
            fill: var(--primary);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }

        .nav-desktop a {
            color: rgba(255,255,255,0.82);
            font-size: 14.5px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .nav-desktop a:hover {
            color: #fff;
            background: rgba(200,240,74,0.12);
        }

        .nav-desktop a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.1);
            position: relative;
        }

        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }

        .header-cta {
            flex-shrink: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 14.5px;
            padding: 11px 22px;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

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

        .btn-primary:hover {
            background: var(--emphasis);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255,122,48,0.3);
        }

        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
        }

        .btn-outline-light:hover {
            background: #fff;
            color: var(--primary);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 13.5px;
        }

        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }

        .btn:focus-visible, a:focus-visible, button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .nav-toggle {
            display: none;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            flex-direction: column;
            gap: 5px;
            z-index: 110;
        }

        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .nav-toggle.nav-open span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }

        .nav-toggle.nav-open span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.nav-open span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            background: var(--primary-dark);
            padding: 12px 24px 24px;
            border-top: 1px solid rgba(200,240,74,0.15);
            flex-direction: column;
            gap: 4px;
        }

        .mobile-menu.show {
            display: flex;
        }

        .mobile-menu a {
            color: rgba(255,255,255,0.82);
            font-size: 15px;
            font-weight: 500;
            padding: 12px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
        }

        .mobile-menu a:hover {
            color: #fff;
            background: rgba(200,240,74,0.12);
        }

        .mobile-menu a.active {
            color: var(--accent);
            background: rgba(200,240,74,0.1);
        }

        /* Breadcrumb */
        .breadcrumb-wrap {
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
            padding: 14px 0;
        }

        .breadcrumb {
            margin: 0;
            padding: 0;
            list-style: none;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb li a {
            color: var(--text-secondary);
            transition: color 0.2s;
        }

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

        .breadcrumb li.current {
            color: var(--primary);
            font-weight: 600;
        }

        .breadcrumb li:not(:last-child)::after {
            content: '/';
            color: var(--text-muted);
            font-size: 13px;
        }

        /* Category Header */
        .category-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #1a3d35 100%);
            color: #fff;
            padding: 56px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .category-header::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -40px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(200,240,74,0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .category-header h1 {
            font-size: clamp(30px, 4vw, 42px);
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 14px;
            color: #fff;
            position: relative;
            z-index: 1;
        }

        .category-header .header-desc {
            font-size: 16px;
            color: rgba(255,255,255,0.78);
            max-width: 720px;
            line-height: 1.7;
            position: relative;
            z-index: 1;
        }

        .category-header .header-meta {
            display: flex;
            gap: 20px;
            margin-top: 20px;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        .category-header .header-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 13.5px;
            color: rgba(255,255,255,0.7);
        }

        .category-header .header-meta .dot {
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
            display: inline-block;
        }

        /* Section Base */
        .section {
            padding: var(--section-space) 0;
        }

        .section-alt {
            background: var(--section-alt);
        }

        .section-title {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .section-subtitle {
            font-size: 15.5px;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
            margin-bottom: 36px;
        }

        .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--section-alt);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: var(--radius-tag);
            letter-spacing: 0.3px;
        }

        .tag-accent {
            background: var(--accent);
            color: var(--primary);
        }

        .tag-emphasis {
            background: var(--emphasis);
            color: #fff;
        }

        /* Version Overview Card */
        .version-overview-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            display: flex;
            flex-wrap: wrap;
        }

        .version-overview-img {
            flex: 0 0 320px;
            min-height: 240px;
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .version-overview-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .version-overview-body {
            flex: 1;
            padding: 32px;
        }

        .version-overview-body .version-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--accent);
            color: var(--primary);
            font-weight: 700;
            font-size: 13px;
            padding: 5px 12px;
            border-radius: 20px;
            margin-bottom: 16px;
        }

        .version-overview-body h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 10px;
        }

        .version-overview-body p {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 18px;
        }

        .version-stats {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .version-stat {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .version-stat .stat-label {
            font-size: 12.5px;
            color: var(--text-muted);
        }

        .version-stat .stat-value {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary);
        }

        /* Timeline */
        .timeline {
            position: relative;
            padding-left: 28px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 6px;
            bottom: 6px;
            width: 2px;
            background: var(--border);
            border-radius: 1px;
        }

        .timeline-item {
            position: relative;
            padding-bottom: 28px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -24px;
            top: 6px;
            width: 12px;
            height: 12px;
            background: var(--accent);
            border-radius: 50%;
            border: 3px solid var(--primary);
            z-index: 1;
        }

        .timeline-item .timeline-version {
            font-weight: 700;
            color: var(--primary);
            font-size: 15.5px;
            margin-bottom: 2px;
        }

        .timeline-item .timeline-date {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 6px;
            font-family: var(--font-num);
        }

        .timeline-item .timeline-desc {
            font-size: 14.5px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 6px;
        }

        .timeline-item .timeline-link {
            font-size: 13.5px;
            font-weight: 600;
            color: var(--primary);
            transition: color 0.2s;
        }

        .timeline-item .timeline-link:hover {
            color: var(--emphasis);
        }

        /* Compare Table */
        .compare-table-wrap {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
        }

        .compare-table th,
        .compare-table td {
            padding: 16px 20px;
            text-align: center;
            border-bottom: 1px solid var(--border);
            font-size: 14.5px;
        }

        .compare-table th {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 15px;
        }

        .compare-table th:first-child {
            text-align: left;
            border-radius: 0;
        }

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

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

        .compare-table tr:hover td {
            background: #FAFCF8;
        }

        .compare-check {
            color: #2E9E4F;
            font-weight: 700;
            font-size: 17px;
        }

        .compare-dash {
            color: var(--text-muted);
            font-weight: 500;
        }

        .compare-free-col {
            background: rgba(200,240,74,0.08);
        }

        .table-responsive-scroll {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        /* Update Log List */
        .update-log-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .update-log-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 18px 20px;
            transition: all 0.25s ease;
        }

        .update-log-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }

        .update-log-icon {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            background: var(--section-alt);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
            font-size: 14px;
            font-family: var(--font-num);
        }

        .update-log-content {
            flex: 1;
        }

        .update-log-content h3 {
            font-size: 15.5px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .update-log-content .log-meta {
            display: flex;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 6px;
            flex-wrap: wrap;
        }

        .update-log-content p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 0;
            line-height: 1.6;
        }

        .update-log-link {
            flex-shrink: 0;
            align-self: center;
        }

        .update-log-link a {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 13.5px;
            font-weight: 600;
            color: var(--primary);
            transition: color 0.2s;
            white-space: nowrap;
        }

        .update-log-link a:hover {
            color: var(--emphasis);
        }

        /* Upgrade Suggestion */
        .upgrade-suggestion {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .upgrade-card {
            flex: 1;
            min-width: 260px;
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 24px 26px;
            transition: all 0.25s ease;
        }

        .upgrade-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
            transform: translateY(-3px);
        }

        .upgrade-card .upgrade-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .upgrade-card p {
            font-size: 14.5px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 14px;
        }

        .upgrade-card .upgrade-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            transition: color 0.2s;
        }

        .upgrade-card .upgrade-link:hover {
            color: var(--emphasis);
        }

        /* Download Entry Section */
        .download-entry {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 70%);
            color: #fff;
            border-radius: var(--radius-card);
            padding: 40px 36px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }

        .download-entry .entry-text h2 {
            font-size: 24px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }

        .download-entry .entry-text p {
            color: rgba(255,255,255,0.78);
            font-size: 15px;
            margin-bottom: 0;
        }

        .download-entry .entry-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
        }

        .download-entry .entry-actions .btn-light {
            background: #fff;
            color: var(--primary);
            font-weight: 700;
        }

        .download-entry .entry-actions .btn-light:hover {
            background: var(--accent);
            color: var(--primary);
            transform: translateY(-2px);
        }

        .download-entry .entry-actions .entry-link {
            color: rgba(255,255,255,0.8);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.2s;
            white-space: nowrap;
        }

        .download-entry .entry-actions .entry-link:hover {
            color: var(--accent);
        }

        /* Bottom CTA */
        .bottom-cta {
            background: var(--section-alt);
            border-radius: var(--radius-card);
            padding: 40px 36px;
            text-align: center;
        }

        .bottom-cta h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 10px;
        }

        .bottom-cta p {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 22px;
        }

        .bottom-cta .cta-actions {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.75);
            padding: 60px 0 28px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }

        .footer-brand .logo-text {
            display: block;
            margin-bottom: 12px;
            font-size: 22px;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 280px;
            color: rgba(255,255,255,0.6);
            margin-bottom: 0;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            font-size: 14px;
            padding: 6px 0;
            transition: color 0.2s;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.12);
            padding-top: 22px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 13px;
            color: rgba(255,255,255,0.45);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-desktop {
                gap: 2px;
            }

            .nav-desktop a {
                padding: 8px 10px;
                font-size: 13.5px;
            }

            .version-overview-img {
                flex: 0 0 260px;
            }

            .footer-grid {
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-space: 60px;
            }

            .nav-desktop {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .header-cta {
                display: none;
            }

            .mobile-menu {
                display: none;
            }

            .mobile-menu.show {
                display: flex;
            }

            .version-overview-img {
                flex: 0 0 100%;
                min-height: 200px;
            }

            .version-overview-body {
                padding: 24px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }

            .download-entry {
                padding: 28px 24px;
                flex-direction: column;
                text-align: center;
            }

            .download-entry .entry-actions {
                justify-content: center;
            }

            .bottom-cta {
                padding: 28px 24px;
            }
        }

        @media (max-width: 520px) {
            :root {
                --section-space: 48px;
                --gap: 16px;
            }

            .container {
                padding: 0 16px;
            }

            .category-header {
                padding: 36px 0 32px;
            }

            .category-header h1 {
                font-size: 26px;
            }

            .version-stats {
                gap: 16px;
            }

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

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .update-log-item {
                flex-direction: column;
                gap: 10px;
            }

            .update-log-link {
                align-self: flex-start;
            }

            .upgrade-card {
                min-width: 100%;
            }

            .compare-table-wrap {
                border-radius: 8px;
            }

            .compare-table th,
            .compare-table td {
                padding: 12px 14px;
                font-size: 13px;
            }
        }