/* roulang page: index */
:root {
            --color-primary: #16302E;
            --color-primary-light: #21443F;
            --color-primary-dark: #0E211F;
            --color-accent: #C8913A;
            --color-accent-dark: #A97C2E;
            --color-accent-light: #E0C9A5;
            --color-bg: #F7F3EC;
            --color-surface: #FFFFFF;
            --color-text: #1F1F1F;
            --color-text-light: #6B6B6B;
            --color-text-muted: #A3A3A3;
            --color-border: #E8E2D8;
            --color-border-accent: #E0C9A5;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 10px;
            --radius-xl: 16px;
            --shadow-sm: 0 2px 8px rgba(22, 48, 46, 0.06);
            --shadow-md: 0 4px 12px rgba(22, 48, 46, 0.08);
            --shadow-lg: 0 6px 18px rgba(22, 48, 46, 0.12);
            --shadow-xl: 0 12px 32px rgba(22, 48, 46, 0.16);
            --container-max: 1200px;
            --content-max: 760px;
            --gutter: 20px;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --transition: all 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-lg);
        }

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

        a:hover {
            text-decoration: none;
        }

        button {
            font-family: var(--font-family);
            cursor: pointer;
            border: none;
            background: none;
            transition: var(--transition);
        }

        input, textarea, select {
            font-family: var(--font-family);
            font-size: 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            padding: 10px 14px;
            color: var(--color-text);
            transition: var(--transition);
            width: 100%;
        }

        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(22, 48, 46, 0.08);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
            width: 100%;
        }

        .container-content {
            max-width: var(--content-max);
            margin: 0 auto;
            width: 100%;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(22, 48, 46, 0.04);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-weight: 700;
            font-size: 18px;
            letter-spacing: 1px;
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-text span {
            color: var(--color-accent);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
            justify-content: center;
            flex-wrap: wrap;
        }

        .main-nav a {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-light);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--color-accent);
            border-radius: 1px;
            transition: var(--transition);
        }

        .main-nav a:hover, .main-nav a.active {
            color: var(--color-primary);
        }

        .main-nav a:hover::after, .main-nav a.active::after {
            width: 100%;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.4px;
            line-height: 1.4;
            transition: var(--transition);
            text-align: center;
            cursor: pointer;
            white-space: nowrap;
            -webkit-tap-highlight-color: transparent;
        }

        .btn:focus-visible {
            outline: 3px solid rgba(200, 145, 58, 0.5);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--color-accent);
            color: #fff;
            border: 1.5px solid var(--color-accent);
        }

        .btn-primary:hover {
            background: var(--color-accent-dark);
            border-color: var(--color-accent-dark);
            transform: scale(0.98);
            box-shadow: var(--shadow-md);
        }

        .btn-primary:active {
            background: var(--color-accent-dark);
            transform: scale(0.96);
            box-shadow: var(--shadow-sm);
        }

        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 1.5px solid var(--color-primary);
        }

        .btn-outline:hover {
            background: rgba(22, 48, 46, 0.05);
            border-color: var(--color-primary-dark);
            transform: scale(0.98);
        }

        .btn-outline:active {
            background: rgba(22, 48, 46, 0.08);
            transform: scale(0.96);
        }

        .btn-link {
            background: none;
            color: var(--color-accent);
            padding: 4px 2px;
            border: none;
            font-weight: 500;
            text-decoration: none;
            position: relative;
        }

        .btn-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 1.5px;
            background: var(--color-accent);
            transition: var(--transition);
        }

        .btn-link:hover::after {
            width: 100%;
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 13px;
        }

        .btn-lg {
            padding: 14px 30px;
            font-size: 16px;
            border-radius: var(--radius-lg);
        }

        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
            cursor: pointer;
            transition: var(--transition);
        }

        .nav-toggle span {
            width: 20px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 1px;
            transition: var(--transition);
        }

        .nav-toggle:hover {
            background: rgba(22, 48, 46, 0.04);
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(6px) rotate(45deg);
        }

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

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-6px) rotate(-45deg);
        }

        /* ========== MOBILE NAV ========== */
        .mobile-nav {
            display: none;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 12px 0;
            box-shadow: var(--shadow-sm);
            position: absolute;
            top: 68px;
            left: 0;
            right: 0;
            z-index: 999;
        }

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

        .mobile-nav .container {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .mobile-nav a {
            display: block;
            padding: 12px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .mobile-nav a:hover, .mobile-nav a.active {
            background: rgba(22, 48, 46, 0.06);
            color: var(--color-primary);
        }

        .mobile-nav .btn {
            margin-top: 8px;
            width: 100%;
        }

        /* ========== HERO ========== */
        .hero-section {
            background: var(--color-surface);
            padding: 80px 0 64px;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            background: linear-gradient(135deg, rgba(22, 48, 46, 0.03) 0%, rgba(200, 145, 58, 0.05) 100%);
            pointer-events: none;
            z-index: 0;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr;
            gap: 48px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .hero-content {
            max-width: 620px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            background: rgba(22, 48, 46, 0.06);
            color: var(--color-primary);
            border-radius: 999px;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.3px;
            margin-bottom: 18px;
        }

        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-accent);
        }

        .hero-title {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--color-primary);
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }

        .hero-title em {
            font-style: normal;
            color: var(--color-accent);
            border-bottom: 2px solid var(--color-accent-light);
        }

        .hero-subtitle {
            font-size: 17px;
            line-height: 1.7;
            color: var(--color-text-light);
            margin-bottom: 28px;
            max-width: 540px;
        }

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

        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 28px;
            margin-top: 28px;
            align-items: center;
        }

        .trust-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--color-text-light);
            font-weight: 500;
            letter-spacing: 0.3px;
        }

        .trust-tag .icon-circle {
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: rgba(22, 48, 46, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-primary);
            font-size: 12px;
        }

        .hero-image-wrap {
            position: relative;
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-xl);
            aspect-ratio: 4/3;
            background: var(--color-primary);
        }

        .hero-image-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-xl);
            position: relative;
            z-index: 1;
        }

        .hero-image-wrap::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 40%;
            background: linear-gradient(to top, rgba(22, 48, 46, 0.7), transparent);
            z-index: 2;
            pointer-events: none;
            border-radius: 0 0 var(--radius-xl) var(--radius-xl);
        }

        .hero-image-badge {
            position: absolute;
            bottom: 16px;
            left: 16px;
            z-index: 3;
            background: rgba(255, 255, 255, 0.92);
            border-radius: var(--radius-md);
            padding: 10px 16px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-primary);
            box-shadow: var(--shadow-md);
        }

        /* ========== SECTION ========== */
        section {
            padding: var(--section-padding);
            position: relative;
        }

        section.bg-light {
            background: var(--color-bg);
        }

        section.bg-white {
            background: var(--color-surface);
        }

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

        section.bg-primary .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

        section.bg-primary .section-title {
            color: #fff;
        }

        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .section-header.left {
            text-align: left;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            background: rgba(200, 145, 58, 0.12);
            color: var(--color-accent);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-primary);
            letter-spacing: 0.5px;
        }

        .section-subtitle {
            font-size: 15px;
            color: var(--color-text-light);
            line-height: 1.7;
            margin-top: 10px;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
        }

        .section-header.left .section-subtitle {
            margin-left: 0;
            margin-right: 0;
        }

        /* ========== TRUST STRIP ========== */
        .trust-strip {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 16px 0;
        }

        .trust-strip-inner {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 32px;
            align-items: center;
            justify-content: center;
        }

        .trust-strip-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 500;
            color: var(--color-text-light);
            letter-spacing: 0.3px;
        }

        .trust-strip-item .icon {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: rgba(200, 145, 58, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-size: 11px;
            flex-shrink: 0;
        }

        /* ========== FEATURES OVERVIEW ========== */
        .features-overview {
            background: var(--color-bg);
        }

        .features-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 40px;
        }

        .feature-row {
            display: flex;
            gap: 18px;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 24px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            align-items: flex-start;
        }

        .feature-row:hover {
            box-shadow: var(--shadow-lg);
            border-color: var(--color-border-accent);
            transform: translateY(-2px);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background: rgba(200, 145, 58, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-size: 20px;
            flex-shrink: 0;
            font-weight: 700;
        }

        .feature-info h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 6px;
            line-height: 1.4;
        }

        .feature-info p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
        }

        /* ========== GUIDE STEPS ========== */
        .guide-steps {
            background: var(--color-surface);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .step-card {
            background: var(--color-bg);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            border: 1px solid var(--color-border);
            text-align: center;
            transition: var(--transition);
            position: relative;
        }

        .step-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--color-border-accent);
            transform: translateY(-2px);
        }

        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            margin-bottom: 14px;
        }

        .step-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .step-card p {
            font-size: 13px;
            color: var(--color-text-light);
            line-height: 1.6;
        }

        .guide-more {
            text-align: center;
            margin-top: 28px;
        }

        /* ========== VERSION TIMELINE ========== */
        .version-timeline {
            background: var(--color-bg);
        }

        .timeline {
            position: relative;
            max-width: 720px;
            margin: 40px auto 0;
            padding-left: 28px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--color-border-accent);
            border-radius: 1px;
        }

        .timeline-item {
            position: relative;
            margin-bottom: 28px;
            padding-left: 20px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -26px;
            top: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--color-accent);
            border: 3px solid var(--color-surface);
            box-shadow: var(--shadow-sm);
        }

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

        .timeline-version {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
        }

        .timeline-date {
            font-size: 12px;
            color: var(--color-text-muted);
            margin-bottom: 6px;
        }

        .timeline-item ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .timeline-item ul li {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
            padding-left: 14px;
            position: relative;
            margin-bottom: 4px;
        }

        .timeline-item ul li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 10px;
            width: 5px;
            height: 5px;
            border-radius: 50%;
            background: var(--color-accent);
        }

        .timeline-more {
            text-align: center;
            margin-top: 32px;
        }

        /* ========== TUTORIAL CARDS ========== */
        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .tutorial-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

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

        .tutorial-thumb {
            aspect-ratio: 16/9;
            background: var(--color-primary-light);
            overflow: hidden;
            position: relative;
        }

        .tutorial-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: var(--transition);
        }

        .tutorial-card:hover .tutorial-thumb img {
            transform: scale(1.05);
        }

        .tutorial-thumb .tag {
            position: absolute;
            top: 10px;
            left: 10px;
            background: rgba(22, 48, 46, 0.85);
            color: #fff;
            font-size: 11px;
            font-weight: 500;
            padding: 4px 10px;
            border-radius: 999px;
            letter-spacing: 0.3px;
        }

        .tutorial-body {
            padding: 16px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .tutorial-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-primary);
            line-height: 1.5;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .tutorial-body .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--color-text-muted);
            margin-top: auto;
        }

        /* ========== SECURITY ========== */
        .security-section {
            background: var(--color-surface);
        }

        .security-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
            margin-top: 40px;
        }

        .security-points {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .security-point {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }

        .security-point .icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(200, 145, 58, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-size: 13px;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .security-point h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
        }

        .security-point p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
        }

        .security-visual {
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-xl);
            background: var(--color-primary);
            position: relative;
        }

        .security-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            min-height: 320px;
        }

        .security-cta {
            text-align: center;
            margin-top: 36px;
        }

        /* ========== CASE STUDIES ========== */
        .case-studies {
            background: var(--color-bg);
        }

        .case-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 40px;
        }

        .case-item {
            display: grid;
            grid-template-columns: 160px 1fr;
            gap: 24px;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 24px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            align-items: center;
        }

        .case-item:hover {
            box-shadow: var(--shadow-lg);
            border-color: var(--color-border-accent);
            transform: translateX(4px);
        }

        .case-thumb {
            width: 160px;
            aspect-ratio: 16/10;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--color-primary-light);
            flex-shrink: 0;
        }

        .case-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }

        .case-info h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 6px;
        }

        .case-info p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
            margin-bottom: 8px;
        }

        .case-result {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-accent-dark);
        }

        .case-result .arrow {
            font-size: 14px;
        }

        /* ========== METRICS ========== */
        .metrics-section {
            background: var(--color-primary);
            color: #fff;
        }

        .metrics-section .section-title {
            color: #fff;
        }

        .metrics-section .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

        .metrics-section .section-tag {
            background: rgba(200, 145, 58, 0.2);
            color: var(--color-accent-light);
        }

        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 40px;
        }

        .metric-item {
            text-align: center;
            padding: 24px 16px;
            border-radius: var(--radius-lg);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: var(--transition);
        }

        .metric-item:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(200, 145, 58, 0.4);
        }

        .metric-value {
            font-size: 34px;
            font-weight: 700;
            color: var(--color-accent);
            line-height: 1.2;
            margin-bottom: 6px;
            letter-spacing: 0.5px;
        }

        .metric-label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.75);
            font-weight: 500;
            letter-spacing: 0.3px;
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: var(--color-surface);
        }

        .faq-list {
            max-width: 750px;
            margin: 36px auto 0;
        }

        .faq-item {
            border-bottom: 1px solid var(--color-border);
            padding: 0;
            transition: var(--transition);
        }

        .faq-item:first-child {
            border-top: 1px solid var(--color-border);
        }

        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 8px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-primary);
            line-height: 1.5;
            list-style: none;
            user-select: none;
            transition: var(--transition);
            gap: 12px;
        }

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

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

        .faq-item .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            border: 1.5px solid var(--color-border-accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: var(--color-accent);
            transition: var(--transition);
            font-weight: 400;
        }

        .faq-item[open] .faq-icon {
            transform: rotate(45deg);
            background: var(--color-accent);
            color: #fff;
            border-color: var(--color-accent);
        }

        .faq-item .faq-content {
            padding: 0 8px 18px;
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.75;
            max-width: 700px;
        }

        /* ========== TIPS ========== */
        .tips-section {
            background: var(--color-bg);
        }

        .tips-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 20px;
            margin-top: 40px;
        }

        .tip-feature {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .tip-feature:hover {
            box-shadow: var(--shadow-lg);
        }

        .tip-feature-thumb {
            aspect-ratio: 16/8;
            background: var(--color-primary-light);
            overflow: hidden;
        }

        .tip-feature-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }

        .tip-feature-body {
            padding: 20px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .tip-feature-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 8px;
        }

        .tip-feature-body p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
            margin-bottom: 10px;
        }

        .tip-feature-body .read-count {
            font-size: 12px;
            color: var(--color-text-muted);
            margin-top: auto;
        }

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

        .tip-mini {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            padding: 16px 18px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            cursor: pointer;
        }

        .tip-mini:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--color-border-accent);
            transform: translateX(3px);
        }

        .tip-mini h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
            line-height: 1.4;
        }

        .tip-mini p {
            font-size: 13px;
            color: var(--color-text-muted);
            line-height: 1.5;
        }

        /* ========== SUPPORT ========== */
        .support-section {
            background: var(--color-surface);
        }

        .support-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 36px;
            margin-top: 40px;
            align-items: start;
        }

        .support-info {
            padding: 24px;
            background: var(--color-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
        }

        .support-info h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 12px;
        }

        .support-info p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
            margin-bottom: 12px;
        }

        .support-channels {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 16px;
        }

        .support-channel {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--color-text);
            font-weight: 500;
        }

        .support-channel .icon {
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: rgba(200, 145, 58, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-size: 13px;
            flex-shrink: 0;
        }

        .support-form {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-md);
        }

        .form-group {
            margin-bottom: 16px;
        }

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-light);
            margin-bottom: 6px;
            letter-spacing: 0.3px;
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        .form-submit {
            width: 100%;
            margin-top: 8px;
        }

        /* ========== CMS NEWS ========== */
        .news-section {
            background: var(--color-bg);
        }

        .news-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 36px;
            max-width: 820px;
            margin-left: auto;
            margin-right: auto;
        }

        .news-item {
            display: flex;
            gap: 16px;
            background: var(--color-surface);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            align-items: center;
        }

        .news-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--color-border-accent);
            transform: translateX(3px);
        }

        .news-thumb {
            width: 100px;
            aspect-ratio: 16/9;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: var(--color-primary-light);
            flex-shrink: 0;
        }

        .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }

        .news-body {
            flex: 1;
            min-width: 0;
        }

        .news-body h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-body .news-summary {
            font-size: 13px;
            color: var(--color-text-light);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 6px;
        }

        .news-body .news-meta {
            font-size: 12px;
            color: var(--color-text-muted);
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .news-empty {
            text-align: center;
            padding: 28px;
            background: var(--color-surface);
            border-radius: var(--radius-md);
            border: 1px dashed var(--color-border);
            color: var(--color-text-muted);
            font-size: 14px;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: var(--color-primary);
            padding: 64px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 60%;
            height: 200%;
            background: radial-gradient(circle, rgba(200, 145, 58, 0.25) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-content {
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .cta-content h2 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        .cta-content p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 520px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }

        .cta-content .btn-primary {
            background: var(--color-accent);
            border-color: var(--color-accent);
            font-size: 16px;
            padding: 14px 36px;
        }

        .cta-content .btn-primary:hover {
            background: var(--color-accent-dark);
            border-color: var(--color-accent-dark);
            transform: scale(0.98);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-primary-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 48px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 36px;
        }

        .footer-brand-name {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            letter-spacing: 0.5px;
        }

        .footer-brand-name span {
            color: var(--color-accent);
        }

        .footer-brand-desc {
            font-size: 13px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 240px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

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

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

        .footer-col ul li a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
            transition: var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--color-accent);
            text-decoration: underline;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            text-align: center;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.5);
            letter-spacing: 0.3px;
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
        }

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

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1199px) {
            .main-nav {
                gap: 16px;
            }
            .main-nav a {
                font-size: 13px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .tutorial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 1024px) {
            .hero-grid {
                gap: 32px;
            }
            .hero-title {
                font-size: 32px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .features-list {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .security-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .tips-grid {
                grid-template-columns: 1fr;
            }
            .support-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            .site-header .container {
                height: 58px;
            }
            .main-nav {
                display: none;
            }
            .nav-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .mobile-nav {
                top: 58px;
            }
            .hero-section {
                padding: 48px 0 40px;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .hero-title {
                font-size: 26px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .hero-image-wrap {
                aspect-ratio: 16/9;
            }
            section {
                padding: var(--section-padding-mobile);
            }
            .section-title {
                font-size: 22px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .tutorial-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .metrics-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .metric-value {
                font-size: 26px;
            }
            .case-item {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .case-thumb {
                width: 100%;
                aspect-ratio: 16/8;
            }
            .news-item {
                flex-direction: column;
                padding: 14px;
            }
            .news-thumb {
                width: 100%;
                aspect-ratio: 16/8;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .cta-content h2 {
                font-size: 22px;
            }
            .timeline {
                padding-left: 20px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }
            .hero-title {
                font-size: 22px;
            }
            .hero-badge {
                font-size: 12px;
                padding: 4px 10px;
            }
            .hero-trust {
                gap: 10px 16px;
            }
            .trust-strip-inner {
                gap: 10px 20px;
            }
            .section-title {
                font-size: 20px;
            }
            .section-subtitle {
                font-size: 14px;
            }
            .metrics-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 15px;
            }
            .faq-item summary {
                font-size: 14px;
                padding: 14px 4px;
            }
            .security-visual img {
                min-height: 220px;
            }
        }

/* roulang page: article */
:root {
            --color-primary: #16302E;
            --color-primary-light: #21443F;
            --color-primary-dark: #0E211F;
            --color-accent: #C8913A;
            --color-accent-dark: #A97C2E;
            --color-accent-light: #E0C9A5;
            --color-bg: #F7F3EC;
            --color-surface: #FFFFFF;
            --color-text: #1F1F1F;
            --color-text-light: #6B6B6B;
            --color-text-muted: #A3A3A3;
            --color-border: #E8E2D8;
            --color-border-accent: #E0C9A5;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 10px;
            --radius-xl: 16px;
            --shadow-sm: 0 2px 8px rgba(22, 48, 46, 0.06);
            --shadow-md: 0 4px 12px rgba(22, 48, 46, 0.08);
            --shadow-lg: 0 6px 18px rgba(22, 48, 46, 0.12);
            --shadow-xl: 0 12px 32px rgba(22, 48, 46, 0.16);
            --container-max: 1200px;
            --content-max: 760px;
            --gutter: 20px;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --transition: all 0.25s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-lg);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            text-decoration: none;
        }
        button {
            font-family: var(--font-family);
            cursor: pointer;
            border: none;
            background: none;
            transition: var(--transition);
        }
        input,
        textarea,
        select {
            font-family: var(--font-family);
            font-size: 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            padding: 10px 14px;
            color: var(--color-text);
            transition: var(--transition);
            width: 100%;
        }
        input:focus,
        textarea:focus,
        select:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(22, 48, 46, 0.08);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
            width: 100%;
        }
        .container-content {
            max-width: var(--content-max);
            margin: 0 auto;
            width: 100%;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(22, 48, 46, 0.04);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 16px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-weight: 700;
            font-size: 18px;
            letter-spacing: 1px;
            flex-shrink: 0;
        }
        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-text span {
            color: var(--color-accent);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
            justify-content: center;
            flex-wrap: wrap;
        }
        .main-nav a {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-light);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--color-accent);
            border-radius: 1px;
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: var(--color-primary);
        }
        .main-nav a:hover::after,
        .main-nav a.active::after {
            width: 100%;
        }
        .nav-cta {
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.3px;
            line-height: 1.4;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--color-accent);
            color: #FFFFFF;
            border: 1px solid var(--color-accent);
        }
        .btn-primary:hover {
            background: var(--color-accent-dark);
            border-color: var(--color-accent-dark);
            transform: scale(0.98);
        }
        .btn-primary:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(200, 145, 58, 0.3);
        }
        .btn-primary:active {
            filter: brightness(0.92);
            transform: scale(0.97);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 1.5px solid var(--color-primary);
        }
        .btn-outline:hover {
            background: rgba(22, 48, 46, 0.05);
            transform: scale(0.98);
        }
        .btn-outline:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(22, 48, 46, 0.12);
        }
        .btn-outline:active {
            filter: brightness(0.95);
            transform: scale(0.97);
        }
        .btn-link {
            background: none;
            color: var(--color-accent);
            border: none;
            padding: 4px 6px;
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
        }
        .btn-link:hover {
            text-decoration: underline;
            text-underline-offset: 4px;
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 13px;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
            z-index: 1001;
        }
        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 1px;
            transition: var(--transition);
            display: block;
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-section {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 16px 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--color-text-muted);
        }
        .breadcrumb a {
            color: var(--color-text-light);
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--color-accent);
        }
        .breadcrumb .sep {
            color: var(--color-text-muted);
            user-select: none;
        }
        .breadcrumb .current {
            color: var(--color-primary);
            font-weight: 500;
            max-width: 360px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* ========== ARTICLE HERO ========== */
        .article-hero-section {
            background: var(--color-surface);
            padding: 40px 0 32px;
            border-bottom: 1px solid var(--color-border);
        }
        .article-hero-wrap {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
        }
        .article-hero-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--color-primary);
            letter-spacing: 0.3px;
            margin-bottom: 18px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 14px 24px;
            font-size: 13px;
            color: var(--color-text-muted);
            padding-bottom: 20px;
            border-bottom: 1px solid var(--color-border);
            margin-bottom: 24px;
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-label {
            color: var(--color-text-light);
        }
        .article-category-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(200, 145, 58, 0.12);
            color: var(--color-accent-dark);
            letter-spacing: 0.5px;
        }
        .article-cover {
            width: 100%;
            max-height: 400px;
            object-fit: cover;
            border-radius: var(--radius-lg);
            margin-bottom: 24px;
            box-shadow: var(--shadow-md);
        }

        /* ========== ARTICLE CONTENT ========== */
        .article-body-section {
            background: var(--color-surface);
            padding: 32px 0 56px;
            border-bottom: 1px solid var(--color-border);
        }
        .article-content {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
            font-size: 16px;
            line-height: 1.8;
            color: var(--color-text);
            letter-spacing: 0.3px;
        }
        .article-content h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-primary);
            margin-top: 32px;
            margin-bottom: 16px;
            line-height: 1.4;
        }
        .article-content h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--color-primary);
            margin-top: 24px;
            margin-bottom: 12px;
            line-height: 1.45;
        }
        .article-content p {
            margin-bottom: 18px;
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 18px;
            padding-left: 24px;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content blockquote {
            border-left: 3px solid var(--color-accent);
            background: rgba(200, 145, 58, 0.06);
            padding: 16px 20px;
            margin: 20px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-text-light);
            font-size: 15px;
        }
        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-lg);
            margin: 20px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-content a {
            color: var(--color-accent-dark);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--color-primary);
        }
        .article-content code {
            background: #f4f1ea;
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 14px;
            color: var(--color-primary);
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
        }
        .article-content pre {
            background: var(--color-primary-dark);
            color: #e8e2d8;
            padding: 16px 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 20px 0;
            font-size: 14px;
            line-height: 1.6;
        }
        .article-content pre code {
            background: none;
            color: inherit;
            padding: 0;
            font-size: 13px;
        }
        .article-not-found {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 80px var(--gutter);
            text-align: center;
        }
        .article-not-found p {
            font-size: 18px;
            color: var(--color-text-light);
            margin-bottom: 20px;
        }

        /* ========== TAGS SECTION ========== */
        .article-tags-section {
            background: var(--color-bg);
            padding: 36px 0;
        }
        .article-tags-wrap {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
        }
        .article-tags-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-light);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        .article-tags-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .article-tag {
            display: inline-block;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            color: var(--color-primary);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            transition: var(--transition);
            cursor: pointer;
        }
        .article-tag:hover {
            border-color: var(--color-accent);
            color: var(--color-accent-dark);
            box-shadow: var(--shadow-sm);
        }

        /* ========== RELATED ARTICLES ========== */
        .related-section {
            background: var(--color-surface);
            padding: 56px 0 64px;
            border-bottom: 1px solid var(--color-border);
        }
        .related-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 28px;
            flex-wrap: wrap;
            gap: 12px;
        }
        .related-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.3px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .related-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            min-height: 100%;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-border-accent);
        }
        .related-card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            border-radius: 0;
            margin: 0;
        }
        .related-card-body {
            padding: 16px 18px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .related-card-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.5;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card-excerpt {
            font-size: 13px;
            color: var(--color-text-light);
            line-height: 1.6;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .related-card-date {
            font-size: 12px;
            color: var(--color-text-muted);
            letter-spacing: 0.3px;
        }
        .related-empty {
            text-align: center;
            padding: 32px 0;
        }

        /* ========== CTA SECTION ========== */
        .article-cta-section {
            background: var(--color-primary);
            padding: 56px 0;
            text-align: center;
        }
        .article-cta-wrap {
            max-width: 640px;
            margin: 0 auto;
            padding: 0 var(--gutter);
        }
        .article-cta-title {
            font-size: 26px;
            font-weight: 700;
            color: #FFFFFF;
            letter-spacing: 0.5px;
            margin-bottom: 14px;
            line-height: 1.4;
        }
        .article-cta-desc {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 26px;
            line-height: 1.7;
        }
        .article-cta-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 700;
            background: var(--color-accent);
            color: #FFFFFF;
            border: 1px solid var(--color-accent);
            letter-spacing: 0.5px;
            transition: var(--transition);
        }
        .article-cta-btn:hover {
            background: var(--color-accent-dark);
            border-color: var(--color-accent-dark);
            transform: scale(0.97);
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
        }
        .article-cta-btn:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(200, 145, 58, 0.4);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand-name {
            font-size: 18px;
            font-weight: 700;
            color: #FFFFFF;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }
        .footer-brand-name span {
            color: var(--color-accent);
        }
        .footer-brand-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.6;
            max-width: 260px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: #FFFFFF;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--color-accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 20px;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 4px;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 768px) {
            .site-header .container {
                height: 60px;
            }
            .main-nav {
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: center;
                gap: 0;
                padding: 16px 0;
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-md);
                display: none;
                z-index: 999;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                text-align: center;
                padding: 12px 0;
                font-size: 15px;
                border-bottom: 1px solid var(--color-border);
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .main-nav a::after {
                display: none;
            }
            .nav-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .article-hero-title {
                font-size: 26px;
            }
            .article-content {
                font-size: 15px;
                line-height: 1.8;
            }
            .article-cta-title {
                font-size: 20px;
            }
            .related-title {
                font-size: 20px;
            }
            .footer-brand-desc {
                max-width: 100%;
            }
        }
        @media (max-width: 520px) {
            :root {
                --section-padding: var(--section-padding-mobile);
                --gutter: 14px;
            }
            .article-hero-title {
                font-size: 22px;
                line-height: 1.4;
            }
            .article-meta {
                gap: 8px 14px;
                font-size: 12px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-card-img {
                aspect-ratio: 16/9;
            }
            .article-content {
                font-size: 14.5px;
                line-height: 1.75;
            }
            .article-content h2 {
                font-size: 19px;
            }
            .article-content h3 {
                font-size: 16px;
            }
            .article-cta-title {
                font-size: 18px;
            }
            .article-cta-btn {
                padding: 12px 24px;
                font-size: 14px;
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom p {
                font-size: 10px;
            }
            .btn {
                padding: 10px 18px;
                font-size: 13px;
            }
            .site-footer {
                padding: 36px 0 20px;
            }
            .footer-brand-name {
                font-size: 16px;
            }
            .footer-col h4 {
                font-size: 13px;
                margin-bottom: 10px;
            }
            .footer-col ul li a {
                font-size: 12px;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #16302E;
            --color-primary-light: #21443F;
            --color-primary-dark: #0E211F;
            --color-accent: #C8913A;
            --color-accent-dark: #A97C2E;
            --color-accent-light: #E0C9A5;
            --color-bg: #F7F3EC;
            --color-surface: #FFFFFF;
            --color-text: #1F1F1F;
            --color-text-light: #6B6B6B;
            --color-text-muted: #A3A3A3;
            --color-border: #E8E2D8;
            --color-border-accent: #E0C9A5;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 10px;
            --radius-xl: 16px;
            --shadow-sm: 0 2px 8px rgba(22, 48, 46, 0.06);
            --shadow-md: 0 4px 12px rgba(22, 48, 46, 0.08);
            --shadow-lg: 0 6px 18px rgba(22, 48, 46, 0.12);
            --shadow-xl: 0 12px 32px rgba(22, 48, 46, 0.16);
            --container-max: 1200px;
            --content-max: 760px;
            --gutter: 20px;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --transition: all 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-lg);
        }

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

        a:hover {
            text-decoration: none;
            color: var(--color-accent);
        }

        button {
            font-family: var(--font-family);
            cursor: pointer;
            border: none;
            background: none;
            transition: var(--transition);
        }

        input,
        textarea,
        select {
            font-family: var(--font-family);
            font-size: 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            padding: 10px 14px;
            color: var(--color-text);
            transition: var(--transition);
            width: 100%;
        }

        input:focus,
        textarea:focus,
        select:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(22, 48, 46, 0.08);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
            width: 100%;
        }

        .container-content {
            max-width: var(--content-max);
            margin: 0 auto;
            width: 100%;
        }

        /* ========== BUTTONS ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            text-align: center;
            white-space: nowrap;
            letter-spacing: 0.3px;
            border: none;
            line-height: 1.4;
        }

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

        .btn-primary {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 2px 8px rgba(200, 145, 58, 0.25);
        }
        .btn-primary:hover {
            background: var(--color-accent-dark);
            transform: scale(0.98);
            color: #fff;
            box-shadow: 0 4px 14px rgba(200, 145, 58, 0.35);
        }

        .btn-primary:active {
            background: #8F6622;
            transform: scale(0.97);
        }

        .btn-outline {
            background: transparent;
            border: 1.5px solid var(--color-primary);
            color: var(--color-primary);
        }
        .btn-outline:hover {
            background: rgba(22, 48, 46, 0.05);
            color: var(--color-primary);
        }
        .btn-outline:active {
            background: rgba(22, 48, 46, 0.08);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }

        .btn-link-accent {
            color: var(--color-accent);
            font-weight: 600;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 2px;
            position: relative;
            background: none;
            border: none;
        }
        .btn-link-accent::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 1.5px;
            background: var(--color-accent);
            transition: var(--transition);
        }
        .btn-link-accent:hover::after {
            width: 100%;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(22, 48, 46, 0.04);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-weight: 700;
            font-size: 18px;
            letter-spacing: 1px;
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-text span {
            color: var(--color-accent);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
            justify-content: center;
            flex-wrap: wrap;
        }
        .main-nav a {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-light);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--color-accent);
            border-radius: 1px;
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: var(--color-primary);
        }
        .main-nav a:hover::after,
        .main-nav a.active::after {
            width: 100%;
        }

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

        .nav-toggle {
            display: none;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            flex-shrink: 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 1px;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(22, 48, 46, 0.05);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== PAGE HERO (Category H1 Zone) ========== */
        .page-hero {
            background: var(--color-bg);
            border-bottom: 1px solid var(--color-border);
            padding: 64px 0 48px;
        }
        .page-hero-grid {
            display: grid;
            grid-template-columns: 1fr 420px;
            gap: 40px;
            align-items: center;
        }
        .page-hero-text h1 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-primary);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .page-hero-text .hero-subtitle {
            font-size: 16px;
            color: var(--color-text-light);
            line-height: 1.7;
            max-width: 560px;
            margin-bottom: 20px;
        }
        .hero-tags {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .hero-tag {
            font-size: 12px;
            color: var(--color-primary);
            background: rgba(22, 48, 46, 0.06);
            border: 1px solid var(--color-border);
            padding: 5px 12px;
            border-radius: 100px;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .page-hero-image {
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            background: var(--color-surface);
            aspect-ratio: 4/3;
        }
        .page-hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-xl);
        }

        /* ========== INTRO SECTION ========== */
        .intro-section {
            background: var(--color-surface);
            padding: var(--section-padding);
        }
        .intro-card {
            background: var(--color-bg);
            border-radius: var(--radius-lg);
            padding: 28px 32px;
            border: 1px solid var(--color-border);
            max-width: 860px;
            margin: 0 auto;
        }
        .intro-card p {
            font-size: 15px;
            line-height: 1.85;
            color: var(--color-text);
            margin-bottom: 0;
        }

        /* ========== STEPS SECTION ========== */
        .steps-section {
            background: var(--color-bg);
            padding: var(--section-padding);
        }
        .section-head {
            margin-bottom: 32px;
            text-align: center;
        }
        .section-head h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.3;
            margin-bottom: 10px;
        }
        .section-head p {
            color: var(--color-text-light);
            font-size: 15px;
            max-width: 640px;
            margin: 0 auto;
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
            max-width: 1080px;
            margin: 0 auto;
        }
        .step-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 24px 22px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            height: 100%;
            position: relative;
        }
        .step-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--color-border-accent);
        }
        .step-number {
            font-size: 14px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 2px;
            text-transform: uppercase;
            margin-bottom: 12px;
        }
        .step-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 8px;
            line-height: 1.35;
        }
        .step-desc {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.65;
        }

        /* ========== LIST SECTION (CMS) ========== */
        .list-section {
            background: var(--color-surface);
            padding: var(--section-padding);
        }
        .list-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }
        .list-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .list-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--color-border-accent);
        }
        .list-card-img {
            aspect-ratio: 16/9;
            overflow: hidden;
            flex-shrink: 0;
            background: #EDE7DB;
        }
        .list-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }
        .list-card-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .list-card-title {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-primary);
            line-height: 1.45;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .list-card-desc {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.65;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
        }
        .list-card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--color-text-muted);
            border-top: 1px solid var(--color-border);
            padding-top: 12px;
            flex-wrap: wrap;
        }
        .list-card-tag {
            background: rgba(22, 48, 46, 0.06);
            color: var(--color-primary);
            padding: 3px 10px;
            border-radius: 100px;
            font-size: 11px;
            font-weight: 500;
            white-space: nowrap;
        }
        .list-more-wrapper {
            text-align: center;
            margin-top: 32px;
        }

        /* ========== SUB TOPICS ========== */
        .subtopics-section {
            background: var(--color-bg);
            padding: var(--section-padding);
        }
        .subtopics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
            max-width: 960px;
            margin: 0 auto;
        }
        .subtopic-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 18px 16px;
            text-align: center;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 64px;
            letter-spacing: 0.3px;
        }
        .subtopic-card:hover {
            border-color: var(--color-accent);
            color: var(--color-accent-dark);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        /* ========== TIPS SECTION ========== */
        .tips-section {
            background: var(--color-surface);
            padding: var(--section-padding);
        }
        .tips-list {
            max-width: 720px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .tip-item {
            background: var(--color-bg);
            border-left: 4px solid var(--color-accent);
            padding: 16px 20px;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            border: 1px solid var(--color-border);
            border-left-width: 4px;
            border-left-color: var(--color-accent);
        }
        .tip-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--color-accent);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 13px;
            font-weight: 700;
            margin-top: 3px;
        }
        .tip-text {
            font-size: 14px;
            color: var(--color-text);
            line-height: 1.65;
        }

        /* ========== RELATED SECTION (CMS) ========== */
        .related-section {
            background: var(--color-bg);
            padding: var(--section-padding);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            max-width: 960px;
            margin: 0 auto;
        }
        .related-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .related-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .related-card-img {
            aspect-ratio: 16/9;
            overflow: hidden;
            flex-shrink: 0;
            background: #EDE7DB;
        }
        .related-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card-body {
            padding: 16px 18px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            line-height: 1.45;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card-desc {
            font-size: 13px;
            color: var(--color-text-light);
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 10px;
        }
        .related-card-meta {
            font-size: 12px;
            color: var(--color-text-muted);
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: var(--color-primary);
            padding: 56px 0;
            color: #fff;
        }
        .cta-content {
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: 24px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            line-height: 1.35;
        }
        .cta-content p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 24px;
            line-height: 1.7;
        }
        .cta-content .btn-primary {
            background: var(--color-accent);
            color: #fff;
            padding: 13px 32px;
            font-size: 15px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
        }
        .cta-content .btn-primary:hover {
            background: var(--color-accent-dark);
            transform: scale(0.98);
        }

        /* ========== EMPTY STATE ========== */
        .empty-state {
            text-align: center;
            padding: 32px 20px;
            color: var(--color-text-muted);
            font-size: 14px;
            background: var(--color-bg);
            border-radius: var(--radius-md);
            border: 1px dashed var(--color-border);
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: var(--section-padding);
        }
        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-primary);
            color: rgba(255, 255, 255, 0.85);
            padding: 56px 0 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }
        .footer-brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .footer-brand-name span {
            color: var(--color-accent);
        }
        .footer-brand-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.65;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--color-accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 20px;
            text-align: center;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-bottom p {
            margin-bottom: 0;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .page-hero-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .page-hero-image {
                max-width: 480px;
                margin: 0 auto;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .list-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .subtopics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .site-header .container {
                height: 60px;
                flex-wrap: wrap;
            }
            .logo-text {
                font-size: 16px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 60px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-md);
                padding: 12px 20px;
                z-index: 999;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 4px;
                border-bottom: 1px solid var(--color-border);
                width: 100%;
                text-align: left;
                font-size: 15px;
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .main-nav a::after {
                display: none;
            }
            .nav-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .page-hero {
                padding: 40px 0 36px;
            }
            .page-hero-text h1 {
                font-size: 26px;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .section-head h2 {
                font-size: 22px;
            }
            .cta-content h2 {
                font-size: 20px;
            }
            .list-grid,
            .related-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 520px) {
            :root {
                --section-padding: 40px 0;
                --gutter: 16px;
            }
            .steps-grid,
            .subtopics-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .page-hero-text h1 {
                font-size: 22px;
            }
            .hero-tag {
                font-size: 11px;
                padding: 4px 10px;
            }
            .btn {
                width: 100%;
                padding: 12px 20px;
                font-size: 13px;
            }
            .btn-sm {
                width: auto;
                padding: 8px 16px;
            }
            .intro-card {
                padding: 20px 18px;
            }
            .step-card {
                padding: 18px 16px;
            }
            .list-card-body {
                padding: 14px 16px 16px;
            }
            .cta-section {
                padding: 40px 0;
            }
            .cta-content .btn-primary {
                padding: 12px 24px;
                font-size: 14px;
            }
        }

/* roulang page: category2 */
:root {
            --color-primary: #16302E;
            --color-primary-light: #21443F;
            --color-primary-dark: #0E211F;
            --color-accent: #C8913A;
            --color-accent-dark: #A97C2E;
            --color-accent-light: #E0C9A5;
            --color-bg: #F7F3EC;
            --color-surface: #FFFFFF;
            --color-text: #1F1F1F;
            --color-text-light: #6B6B6B;
            --color-text-muted: #A3A3A3;
            --color-border: #E8E2D8;
            --color-border-accent: #E0C9A5;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 10px;
            --radius-xl: 16px;
            --shadow-sm: 0 2px 8px rgba(22, 48, 46, 0.06);
            --shadow-md: 0 4px 12px rgba(22, 48, 46, 0.08);
            --shadow-lg: 0 6px 18px rgba(22, 48, 46, 0.12);
            --shadow-xl: 0 12px 32px rgba(22, 48, 46, 0.16);
            --container-max: 1200px;
            --content-max: 760px;
            --gutter: 20px;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --transition: all 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-lg);
        }

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

        a:hover {
            text-decoration: none;
        }

        button {
            font-family: var(--font-family);
            cursor: pointer;
            border: none;
            background: none;
            transition: var(--transition);
        }

        input, textarea, select {
            font-family: var(--font-family);
            font-size: 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            padding: 10px 14px;
            color: var(--color-text);
            transition: var(--transition);
            width: 100%;
        }

        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(22, 48, 46, 0.08);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
            width: 100%;
        }

        .container-content {
            max-width: var(--content-max);
            margin: 0 auto;
            width: 100%;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(22, 48, 46, 0.04);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-weight: 700;
            font-size: 18px;
            letter-spacing: 1px;
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-text span {
            color: var(--color-accent);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
            justify-content: center;
            flex-wrap: wrap;
        }

        .main-nav a {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-light);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--color-accent);
            border-radius: 1px;
            transition: var(--transition);
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--color-primary);
        }

        .main-nav a:hover::after,
        .main-nav a.active::after {
            width: 100%;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            line-height: 1.4;
            transition: var(--transition);
            cursor: pointer;
            white-space: nowrap;
        }

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

        .btn-primary:hover {
            background: var(--color-accent-dark);
            border-color: var(--color-accent-dark);
            transform: scale(0.98);
            color: #fff;
        }

        .btn-primary:focus {
            outline: 3px solid rgba(200, 145, 58, 0.4);
            outline-offset: 2px;
        }

        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 1.5px solid var(--color-primary);
        }

        .btn-outline:hover {
            background: rgba(22, 48, 46, 0.05);
            color: var(--color-primary);
        }

        .btn-sm {
            padding: 9px 18px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }

        .btn-lg {
            padding: 14px 30px;
            font-size: 15px;
            border-radius: var(--radius-md);
        }

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

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* ========== MAIN / SECTIONS ========== */
        main {
            min-height: 60vh;
        }

        .section {
            padding: var(--section-padding);
        }

        .section-white {
            background: var(--color-surface);
        }

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

        .section-subtle {
            background: #F2EDE5;
        }

        .section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.3;
            margin-bottom: 12px;
        }

        .section-lead {
            font-size: 15px;
            color: var(--color-text-light);
            max-width: 700px;
            margin: 0 auto 32px;
        }

        .text-center {
            text-align: center;
        }

        .mt-2 { margin-top: 8px; }
        .mt-3 { margin-top: 16px; }
        .mb-2 { margin-bottom: 8px; }
        .mb-3 { margin-bottom: 16px; }
        .mb-4 { margin-bottom: 24px; }

        /* ========== CATEGORY HERO ========== */
        .category-hero {
            background: var(--color-bg);
            padding: 56px 0 40px;
        }

        .category-hero .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .category-hero-content {
            max-width: 560px;
        }

        .category-hero-content h1 {
            font-size: 36px;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.25;
            margin-bottom: 16px;
        }

        .category-hero-content p {
            font-size: 16px;
            color: var(--color-text-light);
            line-height: 1.7;
            margin-bottom: 24px;
        }

        .category-hero-image {
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            background: #e8e2d8;
        }

        .category-hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-xl);
        }

        /* ========== CATEGORY INTRO ========== */
        .category-intro {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
            padding: 32px 0;
        }

        .category-intro .container {
            max-width: 860px;
            text-align: center;
        }

        .category-intro p {
            font-size: 15px;
            color: var(--color-text-light);
            line-height: 1.75;
        }

        /* ========== ARTICLE CARD GRID ========== */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .article-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .article-card-image {
            display: block;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #e8e2d8;
        }

        .article-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform 0.3s ease;
        }

        .article-card:hover .article-card-image img {
            transform: scale(1.03);
        }

        .article-card-body {
            padding: 20px 20px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 10px;
            font-size: 12px;
            color: var(--color-text-muted);
        }

        .article-tag {
            background: var(--color-accent-light);
            color: var(--color-accent-dark);
            padding: 2px 10px;
            border-radius: 20px;
            font-size: 11px;
            font-weight: 600;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .article-time {
            white-space: nowrap;
        }

        .article-card-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-primary);
            line-height: 1.4;
            margin-bottom: 10px;
        }

        .article-card-body h3 a {
            color: inherit;
        }

        .article-card-body h3 a:hover {
            color: var(--color-accent);
        }

        .article-card-body p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .empty-state {
            text-align: center;
            color: var(--color-text-muted);
            padding: 40px 0;
            font-size: 15px;
        }

        .list-footer {
            text-align: center;
            margin-top: 32px;
        }

        .list-footer a {
            color: var(--color-accent);
            font-weight: 600;
            font-size: 14px;
            text-decoration: none;
            border-bottom: 1px solid transparent;
            transition: var(--transition);
        }

        .list-footer a:hover {
            border-bottom-color: var(--color-accent);
        }

        /* ========== SUBTOPICS ========== */
        .subtopic-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        .subtopic-btn {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 14px 24px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            cursor: default;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            letter-spacing: 0.3px;
        }

        .subtopic-btn:hover {
            border-color: var(--color-accent);
            color: var(--color-accent-dark);
            background: #FFF9F0;
            transform: translateY(-2px);
        }

        /* ========== TIPS ========== */
        .tips-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-left: 4px solid var(--color-accent);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            box-shadow: var(--shadow-sm);
            max-width: 800px;
            margin: 0 auto;
        }

        .tips-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .tips-card li {
            position: relative;
            padding-left: 24px;
            margin-bottom: 12px;
            font-size: 15px;
            color: var(--color-text);
            line-height: 1.6;
        }

        .tips-card li:last-child {
            margin-bottom: 0;
        }

        .tips-card li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 10px;
            width: 8px;
            height: 8px;
            background: var(--color-accent);
            border-radius: 50%;
        }

        /* ========== CTA SECTION ========== */
        .category-cta {
            background: var(--color-primary);
            color: #fff;
            text-align: center;
            padding: 56px 0;
        }

        .category-cta h2 {
            font-size: 26px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .category-cta p {
            font-size: 15px;
            color: rgba(255,255,255,0.8);
            margin-bottom: 24px;
        }

        .category-cta .btn-primary {
            background: var(--color-accent);
            border-color: var(--color-accent);
            color: #fff;
        }

        .category-cta .btn-primary:hover {
            background: var(--color-accent-dark);
            border-color: var(--color-accent-dark);
        }

        /* ========== RELATED ARTICLES ========== */
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .related-card a {
            display: block;
            color: inherit;
        }

        .related-card img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            border-radius: 0;
        }

        .related-card .related-card-body {
            padding: 16px 18px 18px;
        }

        .related-card .article-tag {
            margin-bottom: 8px;
            display: inline-block;
        }

        .related-card h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            line-height: 1.4;
            margin-bottom: 8px;
        }

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

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-primary);
            color: rgba(255,255,255,0.85);
            padding: 56px 0 24px;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }

        .footer-brand-name span {
            color: var(--color-accent);
        }

        .footer-brand-desc {
            font-size: 13px;
            color: rgba(255,255,255,0.7);
            line-height: 1.7;
            max-width: 260px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

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

        .footer-col li {
            margin-bottom: 10px;
        }

        .footer-col a {
            color: rgba(255,255,255,0.7);
            font-size: 13px;
            transition: var(--transition);
            display: inline-block;
        }

        .footer-col a:hover {
            color: var(--color-accent);
            transform: translateX(2px);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            text-align: center;
            color: rgba(255,255,255,0.6);
            font-size: 12px;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 991.98px) {
            .main-nav {
                gap: 18px;
            }

            .category-hero .container {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .category-hero-content h1 {
                font-size: 30px;
            }

            .article-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
        }

        @media (max-width: 767.98px) {
            .site-header .container {
                height: 60px;
            }

            .main-nav {
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: flex-start;
                gap: 0;
                padding: 16px 20px;
                box-shadow: var(--shadow-lg);
                border-bottom: 1px solid var(--color-border);
                display: none;
                z-index: 999;
            }

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

            .main-nav a {
                padding: 12px 0;
                width: 100%;
                border-bottom: 1px solid var(--color-border);
                font-size: 15px;
            }

            .main-nav a:last-child {
                border-bottom: none;
            }

            .main-nav a::after {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-cta {
                margin-left: auto;
            }

            .category-hero {
                padding: 36px 0 28px;
            }

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

            .category-hero-content p {
                font-size: 14px;
            }

            .article-grid {
                grid-template-columns: 1fr;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .section {
                padding: var(--section-padding-mobile);
            }

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

            .footer-brand-desc {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .btn-lg {
                width: 100%;
                justify-content: center;
            }

            .subtopic-group {
                flex-direction: column;
            }

            .subtopic-btn {
                width: 100%;
                text-align: center;
            }

            .tips-card {
                padding: 18px;
            }
        }

/* roulang page: category3 */
:root {
            --color-primary: #16302E;
            --color-primary-light: #21443F;
            --color-primary-dark: #0E211F;
            --color-accent: #C8913A;
            --color-accent-dark: #A97C2E;
            --color-accent-light: #E0C9A5;
            --color-bg: #F7F3EC;
            --color-surface: #FFFFFF;
            --color-text: #1F1F1F;
            --color-text-light: #6B6B6B;
            --color-text-muted: #A3A3A3;
            --color-border: #E8E2D8;
            --color-border-accent: #E0C9A5;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 10px;
            --radius-xl: 16px;
            --shadow-sm: 0 2px 8px rgba(22, 48, 46, 0.06);
            --shadow-md: 0 4px 12px rgba(22, 48, 46, 0.08);
            --shadow-lg: 0 6px 18px rgba(22, 48, 46, 0.12);
            --shadow-xl: 0 12px 32px rgba(22, 48, 46, 0.16);
            --container-max: 1200px;
            --content-max: 760px;
            --gutter: 20px;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --transition: all 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-lg);
        }

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

        a:hover {
            text-decoration: none;
            color: var(--color-primary);
        }

        button {
            font-family: var(--font-family);
            cursor: pointer;
            border: none;
            background: none;
            transition: var(--transition);
        }

        input,
        textarea,
        select {
            font-family: var(--font-family);
            font-size: 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            padding: 10px 14px;
            color: var(--color-text);
            transition: var(--transition);
            width: 100%;
        }

        input:focus,
        textarea:focus,
        select:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(22, 48, 46, 0.08);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
            width: 100%;
        }

        .container-content {
            max-width: var(--content-max);
            margin: 0 auto;
            width: 100%;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(22, 48, 46, 0.04);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-weight: 700;
            font-size: 18px;
            letter-spacing: 1px;
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-text span {
            color: var(--color-accent);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
            justify-content: center;
            flex-wrap: wrap;
        }

        .main-nav a {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-light);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--color-accent);
            border-radius: 1px;
            transition: var(--transition);
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--color-primary);
        }

        .main-nav a:hover::after,
        .main-nav a.active::after {
            width: 100%;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: var(--transition);
            white-space: nowrap;
            cursor: pointer;
            line-height: 1.5;
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 13px;
        }

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

        .btn-primary:hover {
            background: var(--color-accent-dark);
            border-color: var(--color-accent-dark);
            color: #fff;
            transform: scale(0.98);
        }

        .btn-primary:focus {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

        .btn-primary:active {
            background: var(--color-accent-dark);
            transform: scale(0.96);
        }

        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 1.5px solid var(--color-primary);
        }

        .btn-outline:hover {
            background: rgba(22, 48, 46, 0.05);
            color: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
        }

        .btn-outline:focus {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 1px;
            transition: var(--transition);
        }

        .nav-toggle:hover {
            background: rgba(22, 48, 46, 0.06);
        }

        /* ========== SECTION COMMON ========== */
        main {
            display: block;
        }

        .section {
            padding: var(--section-padding);
            position: relative;
        }

        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }

        .section-title {
            font-size: 26px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-primary);
            margin: 0 0 10px 0;
            letter-spacing: 0.5px;
        }

        .section-subtitle {
            font-size: 15px;
            color: var(--color-text-light);
            margin: 0 0 32px 0;
            line-height: 1.7;
        }

        .section-center {
            text-align: center;
            max-width: 760px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ========== CATEGORY H1 AREA ========== */
        .category-hero {
            background: var(--color-bg);
            padding: 64px 0 56px 0;
            border-bottom: 1px solid var(--color-border);
        }

        .category-hero .container {
            display: flex;
            align-items: center;
            gap: 48px;
            flex-wrap: wrap;
        }

        .category-hero-content {
            flex: 1 1 480px;
            min-width: 0;
        }

        .category-hero-content .category-tag {
            display: inline-block;
            background: var(--color-accent-light);
            color: var(--color-accent-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            letter-spacing: 0.5px;
            margin-bottom: 14px;
        }

        .category-hero-content h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--color-primary);
            margin: 0 0 16px 0;
            letter-spacing: 0.5px;
        }

        .category-hero-content .hero-desc {
            font-size: 16px;
            color: var(--color-text-light);
            line-height: 1.75;
            margin: 0 0 20px 0;
            max-width: 560px;
        }

        .category-hero-content .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }

        .category-hero-content .hero-meta span {
            font-size: 13px;
            color: var(--color-text-muted);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .category-hero-content .hero-meta .dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--color-accent);
        }

        .category-hero-image {
            flex: 1 1 380px;
            min-width: 0;
            text-align: right;
        }

        .category-hero-image img {
            max-width: 100%;
            width: 100%;
            max-height: 340px;
            object-fit: cover;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-lg);
        }

        /* ========== CATEGORY INTRO ========== */
        .category-intro {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 32px 0;
        }

        .category-intro .intro-card {
            background: var(--color-bg);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            border: 1px solid var(--color-border);
        }

        .category-intro .intro-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-accent-dark);
            letter-spacing: 0.5px;
            margin-bottom: 8px;
            display: block;
        }

        .category-intro .intro-text {
            font-size: 15px;
            color: var(--color-text);
            line-height: 1.8;
            margin: 0;
        }

        /* ========== FEATURE CARDS ========== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 24px;
        }

        .feature-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

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

        .feature-card .feature-icon {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-accent-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent-dark);
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 4px;
            flex-shrink: 0;
        }

        .feature-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--color-primary);
            margin: 0;
            line-height: 1.4;
        }

        .feature-card p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.7;
            margin: 0;
        }

        .more-link {
            display: inline-block;
            color: var(--color-accent-dark);
            font-size: 14px;
            font-weight: 600;
            margin-top: 28px;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: var(--transition);
        }

        .more-link:hover {
            color: var(--color-accent);
            border-bottom-color: var(--color-accent);
        }

        /* ========== SUB TOPIC CHIPS ========== */
        .topic-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 20px;
        }

        .topic-chip {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 30px;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            cursor: pointer;
            transition: var(--transition);
        }

        .topic-chip:hover {
            border-color: var(--color-accent);
            color: var(--color-accent-dark);
            background: rgba(200, 145, 58, 0.05);
        }

        .topic-chip .chip-icon {
            font-size: 16px;
            color: var(--color-accent);
        }

        /* ========== TIPS ========== */
        .tips-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 28px 32px;
            box-shadow: var(--shadow-sm);
        }

        .tips-list {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .tips-list li {
            font-size: 15px;
            color: var(--color-text);
            line-height: 1.7;
            padding-left: 28px;
            position: relative;
        }

        .tips-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 2px;
            font-size: 15px;
            color: var(--color-accent);
            font-weight: 700;
            background: var(--color-accent-light);
            border-radius: 50%;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ========== CMS LIST ========== */
        .cms-list-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 24px;
        }

        .cms-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .cms-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }

        .cms-card-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: 0;
            border-bottom: 1px solid var(--color-border);
        }

        .cms-card-body {
            padding: 18px 20px 20px 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .cms-card-body h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            margin: 0;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .cms-card-body p {
            font-size: 13px;
            color: var(--color-text-light);
            line-height: 1.65;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .cms-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: auto;
            padding-top: 12px;
            border-top: 1px solid var(--color-border);
            font-size: 12px;
            color: var(--color-text-muted);
        }

        .cms-card-meta .tag {
            background: var(--color-accent-light);
            color: var(--color-accent-dark);
            padding: 2px 10px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 11px;
        }

        .cms-card-link {
            display: block;
            color: var(--color-accent-dark);
            font-weight: 600;
            font-size: 13px;
            margin-top: 8px;
        }

        .cms-card-link:hover {
            color: var(--color-accent);
        }

        .cms-empty {
            background: var(--color-surface);
            border: 1px dashed var(--color-border);
            border-radius: var(--radius-lg);
            padding: 40px 20px;
            text-align: center;
            color: var(--color-text-muted);
            font-size: 14px;
            margin-top: 20px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 20px;
        }

        .related-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 18px;
            transition: var(--transition);
            display: block;
        }

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

        .related-card h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            margin: 0 0 6px 0;
            line-height: 1.5;
        }

        .related-card p {
            font-size: 13px;
            color: var(--color-text-light);
            margin: 0 0 10px 0;
            line-height: 1.6;
        }

        .related-card .related-meta {
            font-size: 12px;
            color: var(--color-text-muted);
            display: flex;
            gap: 12px;
            align-items: center;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: var(--color-primary);
            padding: 64px 0;
            text-align: center;
            border-radius: 0;
        }

        .cta-section .cta-content {
            max-width: 640px;
            margin: 0 auto;
            padding: 0 var(--gutter);
        }

        .cta-section h2 {
            font-size: 26px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px 0;
            line-height: 1.35;
        }

        .cta-section p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.8);
            margin: 0 0 28px 0;
            line-height: 1.7;
        }

        .cta-section .btn-primary {
            font-size: 16px;
            padding: 14px 32px;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-primary);
            color: rgba(255, 255, 255, 0.85);
            padding: 56px 0 24px 0;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 32px;
            margin-bottom: 40px;
        }

        .footer-brand-name {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            margin-bottom: 10px;
        }

        .footer-brand-name span {
            color: var(--color-accent);
        }

        .footer-brand-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
            margin: 0;
            max-width: 260px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 14px 0;
            letter-spacing: 0.5px;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 20px;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.55);
            margin: 0;
            line-height: 1.7;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

            .cms-list-grid,
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .site-footer .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            .site-header .container {
                height: 60px;
            }

            .main-nav {
                display: none;
                position: absolute;
                top: 60px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                gap: 0;
                padding: 12px 0;
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-lg);
                z-index: 999;
            }

            .main-nav.active {
                display: flex;
            }

            .main-nav a {
                padding: 12px 24px;
                width: 100%;
                text-align: center;
                border-bottom: 1px solid var(--color-border);
            }

            .main-nav a:last-child {
                border-bottom: none;
            }

            .main-nav a::after {
                display: none;
            }

            .nav-cta {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .category-hero .container {
                flex-direction: column;
                gap: 24px;
            }

            .category-hero-image {
                text-align: center;
            }

            .category-hero-image img {
                max-height: 260px;
            }

            .section {
                padding: var(--section-padding-mobile);
            }

            .feature-grid {
                grid-template-columns: 1fr;
            }

            .cms-list-grid,
            .related-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }

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

            .category-hero-content h1 {
                font-size: 24px;
            }

            .section-title {
                font-size: 22px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 16px;
            }

            .category-hero {
                padding: 40px 0 32px 0;
            }

            .category-hero-content h1 {
                font-size: 20px;
            }

            .category-hero-content .hero-desc {
                font-size: 14px;
            }

            .section-title {
                font-size: 20px;
            }

            .feature-card {
                padding: 18px;
            }

            .topic-chip {
                padding: 8px 14px;
                font-size: 12px;
            }

            .tips-card {
                padding: 20px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .cta-section h2 {
                font-size: 20px;
            }
        }