/* roulang page: index */
:root {
            --bg: #121014;
            --card-bg: #1B191E;
            --primary: #C8403A;
            --primary-hover: #D84A42;
            --accent: #D8B26E;
            --text: #F5F2EA;
            --muted: #A9A4A0;
            --border: #2A272D;
            --success: #5B7F6A;
            --danger: #9B4E4A;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-sm: 8px;
            --radius-pill: 999px;
            --shadow: 0 2px 8px rgba(0,0,0,0.22);
            --shadow-hover: 0 8px 24px rgba(0,0,0,0.38);
            --font-base: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --transition: 0.25s ease;
        }
        * {
            box-sizing: border-box;
        }
        body {
            background-color: var(--bg);
            color: var(--text);
            font-family: var(--font-base);
            font-size: 16px;
            line-height: 1.85;
            letter-spacing: 0.01em;
            margin: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--text);
            text-decoration: none;
            transition: color var(--transition), border-color var(--transition), background var(--transition);
        }
        a:hover {
            color: var(--primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
        }
        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
            margin-left: auto;
            margin-right: auto;
        }
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background-color: #0F0E12;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .section-sub {
            color: var(--muted);
            font-size: 16px;
            max-width: 720px;
            margin-bottom: 40px;
        }
        .eyebrow {
            display: inline-block;
            font-size: 13px;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 12px;
            border: 1px solid var(--border);
            border-radius: var(--radius-pill);
            padding: 4px 12px;
            background: rgba(216,178,110,0.08);
        }
        .btn-primary-custom {
            background-color: var(--primary);
            color: #F5F2EA;
            border: none;
            border-radius: var(--radius-sm);
            padding: 10px 20px;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-hover);
            color: #F5F2EA;
            transform: translateY(-1px);
        }
        .btn-primary-custom:active {
            transform: translateY(0);
        }
        .btn-ghost {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--muted);
            border-radius: var(--radius-sm);
            padding: 10px 20px;
            font-weight: 600;
            transition: border-color var(--transition), color var(--transition), background var(--transition);
        }
        .btn-ghost:hover {
            border-color: var(--accent);
            color: var(--text);
        }
        .card-custom {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            overflow: hidden;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
        }
        .card-img-wrap {
            overflow: hidden;
            position: relative;
        }
        .card-img-wrap img {
            transition: transform var(--transition);
            width: 100%;
        }
        .card-custom:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .badge-custom {
            display: inline-block;
            font-size: 12px;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border);
            color: var(--muted);
            background: transparent;
            white-space: nowrap;
        }
        .badge-custom.active {
            background: var(--primary);
            color: #F5F2EA;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.15);
        }
        /* Header */
        .site-header {
            background-color: var(--bg);
            border-bottom: 1px solid var(--border);
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo .logo-mark {
            display: inline-block;
            width: 4px;
            height: 20px;
            background-color: var(--accent);
            border-radius: 2px;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-link {
            font-size: 14px;
            color: var(--muted);
            transition: color var(--transition);
            position: relative;
            padding: 4px 0;
        }
        .nav-link.active {
            color: var(--primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -4px;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .navbar-toggler-custom {
            background: none;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 6px 10px;
            color: var(--text);
        }
        .navbar-toggler-custom:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.12);
        }
        /* Pill Nav */
        .pill-nav {
            background-color: rgba(18,16,20,0.95);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
            overflow-x: auto;
            white-space: nowrap;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .pill-nav::-webkit-scrollbar {
            display: none;
        }
        .pill-nav .container {
            display: flex;
            gap: 10px;
            align-items: center;
        }
        .pill {
            display: inline-block;
            font-size: 13px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border);
            color: var(--muted);
            transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
        }
        .pill:hover {
            border-color: var(--accent);
            color: var(--text);
        }
        .pill.active {
            background: var(--primary);
            color: #F5F2EA;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.15);
        }
        /* Hero */
        .hero {
            position: relative;
            padding: 80px 0;
            background: radial-gradient(circle at 20% 20%, rgba(200,64,58,0.08), transparent 40%), radial-gradient(circle at 80% 70%, rgba(216,178,110,0.05), transparent 35%);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 55% 45%;
            gap: 40px;
            align-items: center;
        }
        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            letter-spacing: -0.5px;
            line-height: 1.2;
            margin-bottom: 24px;
        }
        .hero .lead {
            font-size: 18px;
            color: var(--muted);
            max-width: 620px;
            margin-bottom: 32px;
        }
        .hero .cta-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-highlight-card {
            background: linear-gradient(145deg, #1B191E 0%, #201E24 100%);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-hover);
        }
        .hero-highlight-card .recommend {
            display: inline-block;
            background: var(--primary);
            color: #F5F2EA;
            padding: 4px 12px;
            font-size: 12px;
            border-radius: var(--radius-pill);
            margin-bottom: 16px;
        }
        .hero-highlight-card .feature-list {
            list-style: none;
            padding: 0;
            margin: 0 0 24px;
        }
        .hero-highlight-card .feature-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
            font-size: 15px;
            color: var(--muted);
        }
        .hero-highlight-card .feature-list i {
            color: var(--accent);
            font-size: 18px;
        }
        /* Metrics */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .metric {
            text-align: center;
            padding: 28px 16px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
        }
        .metric .number {
            font-size: 32px;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: -0.5px;
            margin-bottom: 8px;
        }
        .metric .label {
            font-size: 14px;
            color: var(--muted);
        }
        /* Services Grid asymmetric */
        .services-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 24px;
        }
        .service-card-large, .service-card-small {
            padding: 28px;
        }
        .service-card-large .card-img-wrap, .service-card-small .card-img-wrap {
            margin-bottom: 16px;
            border-radius: var(--radius-sm);
            height: 180px;
        }
        .service-card-small .card-img-wrap {
            height: 140px;
        }
        .service-card-large h3, .service-card-small h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .service-card-large p, .service-card-small p {
            color: var(--muted);
            font-size: 14px;
            margin-bottom: 16px;
        }
        .service-card-large .btn-ghost, .service-card-small .btn-ghost {
            font-size: 13px;
            padding: 6px 14px;
        }
        /* Showcase horizontal scroll */
        .showcase-track {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            padding-bottom: 12px;
            scrollbar-width: thin;
            scrollbar-color: var(--border) transparent;
        }
        .showcase-track::-webkit-scrollbar {
            height: 6px;
        }
        .showcase-track::-webkit-scrollbar-thumb {
            background-color: var(--border);
            border-radius: 3px;
        }
        .showcase-card {
            min-width: 300px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            flex-shrink: 0;
            transition: transform var(--transition), border-color var(--transition);
        }
        .showcase-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent);
        }
        .showcase-card .card-img-wrap {
            height: 180px;
        }
        .showcase-card .card-body {
            padding: 16px;
        }
        .showcase-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .showcase-card p {
            color: var(--muted);
            font-size: 14px;
            margin-bottom: 12px;
        }
        /* Comparison */
        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .compare-col {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px;
        }
        .compare-col.highlight {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.08);
        }
        .compare-col h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .compare-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
            font-size: 15px;
        }
        .compare-item:last-child {
            border-bottom: none;
        }
        .compare-item i {
            font-size: 18px;
        }
        .icon-ok {
            color: var(--success);
        }
        .icon-bad {
            color: var(--danger);
        }
        /* Milestones */
        .timeline {
            position: relative;
            padding-left: 24px;
            border-left: 2px solid var(--border);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 32px;
            padding-left: 32px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -9px;
            top: 6px;
            width: 16px;
            height: 16px;
            background: var(--accent);
            border-radius: 50%;
            border: 3px solid var(--bg);
        }
        .timeline-item h4 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .timeline-item p {
            color: var(--muted);
            font-size: 15px;
            margin: 0;
        }
        /* News list */
        .news-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 24px;
        }
        .news-main-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-list-item {
            display: flex;
            gap: 16px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 16px;
            transition: border-color var(--transition), transform var(--transition);
        }
        .news-list-item:hover {
            border-color: var(--accent);
            transform: translateX(4px);
        }
        .news-list-item img {
            width: 120px;
            height: 80px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            flex-shrink: 0;
        }
        .news-list-item .content h5 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .news-list-item .content p {
            color: var(--muted);
            font-size: 13px;
            margin-bottom: 8px;
        }
        .news-meta {
            font-size: 12px;
            color: var(--muted);
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .news-meta i {
            margin-right: 4px;
        }
        /* Guarantee rows */
        .guarantee-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px 32px;
        }
        .guarantee-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 16px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
        }
        .guarantee-item i {
            font-size: 24px;
            color: var(--accent);
        }
        .guarantee-content h5 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .guarantee-content p {
            color: var(--muted);
            font-size: 14px;
            margin: 0;
        }
        /* Quick answers */
        .qa-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .qa-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px;
        }
        .qa-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--accent);
        }
        .qa-card p {
            color: var(--muted);
            font-size: 15px;
            margin: 0;
        }
        /* FAQ accordion */
        .faq-accordion .accordion-item {
            background: transparent;
            border: none;
            border-bottom: 1px solid var(--border);
        }
        .faq-accordion .accordion-button {
            background: transparent;
            color: var(--text);
            font-weight: 600;
            font-size: 16px;
            padding: 20px 0;
            border: none;
            box-shadow: none;
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--text);
            background: transparent;
            box-shadow: none;
        }
        .faq-accordion .accordion-button::after {
            background-image: none;
            content: '+';
            font-size: 24px;
            color: var(--accent);
            width: auto;
            height: auto;
            transform: rotate(0deg);
            transition: transform var(--transition);
        }
        .faq-accordion .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
        }
        .faq-accordion .accordion-body {
            color: var(--muted);
            padding: 0 0 20px;
        }
        /* Devices */
        .devices-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .device-card {
            background: #151318;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px;
            text-align: center;
            transition: border-color var(--transition), transform var(--transition);
        }
        .device-card:hover {
            border-color: var(--accent);
            transform: translateY(-4px);
        }
        .device-card i {
            font-size: 36px;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .device-card h4 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .device-card p {
            color: var(--muted);
            font-size: 14px;
            margin: 0;
        }
        /* CTA Form */
        .cta-form-wrap {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 40px;
        }
        .cta-form-wrap .form-label {
            font-size: 13px;
            color: var(--muted);
        }
        .cta-form-wrap .form-control {
            background: #1B191E;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            color: var(--text);
            padding: 10px 14px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .cta-form-wrap .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.12);
            background: #1B191E;
            color: var(--text);
        }
        .cta-form-wrap textarea.form-control {
            min-height: 100px;
        }
        /* Footer */
        .site-footer {
            background: #0E0D10;
            border-top: 1px solid var(--border);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            margin-bottom: 12px;
        }
        .footer-brand p {
            color: var(--muted);
            font-size: 14px;
            margin: 0;
        }
        .footer-col h5 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: var(--muted);
            font-size: 13px;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--primary);
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 20px;
            font-size: 12px;
            color: var(--muted);
            text-align: center;
        }
        .footer-bottom a {
            color: var(--muted);
        }
        /* Responsive */
        @media (max-width: 991px) {
            .hero-grid {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 40px;
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .services-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .guarantee-row {
                grid-template-columns: 1fr;
            }
            .devices-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .hero {
                padding: 48px 0;
            }
            .hero h1 {
                font-size: 32px;
            }
            .hero .lead {
                font-size: 16px;
            }
            .metrics-grid {
                grid-template-columns: 1fr;
            }
            .devices-grid {
                grid-template-columns: 1fr;
            }
            .qa-grid {
                grid-template-columns: 1fr;
            }
            .comparison-grid {
                grid-template-columns: 1fr;
            }
            .news-list-item {
                flex-direction: column;
            }
            .news-list-item img {
                width: 100%;
                height: 180px;
            }
        }

/* roulang page: article */
:root {
            --bg: #121014;
            --card-bg: #1B191E;
            --primary: #C8403A;
            --primary-hover: #D84A42;
            --accent: #D8B26E;
            --text: #F5F2EA;
            --muted: #A9A4A0;
            --border: #2A272D;
            --success: #5B7F6A;
            --danger: #9B4E4A;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-sm: 8px;
            --radius-pill: 999px;
            --shadow: 0 2px 8px rgba(0,0,0,0.22);
            --shadow-hover: 0 8px 24px rgba(0,0,0,0.38);
            --font-base: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --transition: 0.25s ease;
        }
        * {
            box-sizing: border-box;
        }
        body {
            background-color: var(--bg);
            color: var(--text);
            font-family: var(--font-base);
            font-size: 16px;
            line-height: 1.85;
            letter-spacing: 0.01em;
            margin: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--text);
            text-decoration: none;
            transition: color var(--transition), border-color var(--transition), background var(--transition);
        }
        a:hover {
            color: var(--primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
        }
        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
            margin-left: auto;
            margin-right: auto;
        }
        .section {
            padding: 64px 0;
        }
        .section-alt {
            background-color: #0F0E12;
        }
        .section-title {
            font-size: 30px;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
            line-height: 1.3;
        }
        .section-sub {
            color: var(--muted);
            font-size: 16px;
            max-width: 720px;
            margin-bottom: 36px;
        }
        .eyebrow {
            display: inline-block;
            font-size: 13px;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 10px;
            border: 1px solid var(--border);
            border-radius: var(--radius-pill);
            padding: 4px 12px;
            background: rgba(216,178,110,0.08);
        }
        .btn-primary-custom {
            background-color: var(--primary);
            color: #F5F2EA;
            border: none;
            border-radius: var(--radius-sm);
            padding: 10px 20px;
            font-weight: 600;
            display: inline-block;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            cursor: pointer;
            text-align: center;
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-hover);
            color: #F5F2EA;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(200,64,58,0.28);
        }
        .btn-primary-custom:active {
            transform: translateY(0);
        }
        .btn-ghost {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--muted);
            border-radius: var(--radius-sm);
            padding: 10px 20px;
            font-weight: 600;
            display: inline-block;
            transition: border-color var(--transition), color var(--transition), background var(--transition);
            cursor: pointer;
            text-align: center;
        }
        .btn-ghost:hover {
            border-color: var(--accent);
            color: var(--text);
            background: rgba(216,178,110,0.06);
        }
        .card-custom {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            overflow: hidden;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
        }
        .card-img-wrap {
            overflow: hidden;
            position: relative;
        }
        .card-img-wrap img {
            transition: transform var(--transition);
            width: 100%;
        }
        .card-custom:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .badge-custom {
            display: inline-block;
            font-size: 12px;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border);
            color: var(--muted);
            background: transparent;
            white-space: nowrap;
        }
        .badge-custom.active {
            background: var(--primary);
            color: #F5F2EA;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.15);
        }

        /* Header */
        .site-header {
            background-color: var(--bg);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .logo:hover {
            color: var(--text);
        }
        .logo .logo-mark {
            display: inline-block;
            width: 4px;
            height: 20px;
            background-color: var(--accent);
            border-radius: 2px;
            flex-shrink: 0;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-link {
            font-size: 14px;
            color: var(--muted);
            transition: color var(--transition);
            position: relative;
            padding: 4px 0;
            display: inline-block;
        }
        .nav-link.active {
            color: var(--primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -4px;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link:hover {
            color: var(--text);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            color: var(--text);
            font-size: 20px;
            padding: 6px 12px;
            cursor: pointer;
            transition: border-color var(--transition), background var(--transition);
        }
        .nav-toggle:hover {
            border-color: var(--accent);
            background: rgba(216,178,110,0.06);
        }

        /* Pill Nav */
        .pill-nav {
            background-color: rgba(18,16,20,0.96);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
            position: relative;
            z-index: 50;
        }
        .pill-nav .container {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            padding-top: 2px;
            padding-bottom: 2px;
        }
        .pill-nav .container::-webkit-scrollbar {
            display: none;
        }
        .pill {
            font-size: 13px;
            border-radius: var(--radius-pill);
            padding: 6px 14px;
            border: 1px solid var(--border);
            color: var(--muted);
            white-space: nowrap;
            flex-shrink: 0;
            transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
        }
        .pill:hover {
            color: var(--text);
            border-color: var(--accent);
        }
        .pill.active {
            background: var(--primary);
            color: #F5F2EA;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.15);
        }

        /* Breadcrumb */
        .breadcrumb-custom {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
            font-size: 13px;
            color: var(--muted);
            margin-bottom: 24px;
            padding: 0;
            list-style: none;
        }
        .breadcrumb-custom li {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .breadcrumb-custom li + li::before {
            content: '/';
            color: var(--border);
            margin-right: 2px;
        }
        .breadcrumb-custom a {
            color: var(--muted);
        }
        .breadcrumb-custom a:hover {
            color: var(--text);
        }
        .breadcrumb-custom .current {
            color: var(--primary);
            font-weight: 500;
        }

        /* Article Header */
        .article-header {
            padding: 36px 0 24px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 40px;
        }
        .article-header h1 {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -0.5px;
            line-height: 1.35;
            color: var(--text);
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 13px;
            color: var(--muted);
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-item i {
            color: var(--accent);
        }
        .article-meta .badge-custom {
            font-size: 12px;
            border-color: rgba(216,178,110,0.4);
            color: var(--accent);
        }

        /* Article Body */
        .article-body {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text);
            padding-bottom: 28px;
        }
        .article-body p {
            margin-bottom: 1.25em;
        }
        .article-body h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            margin: 1.6em 0 0.6em;
            letter-spacing: -0.3px;
        }
        .article-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin: 1.4em 0 0.5em;
        }
        .article-body img {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin: 1.2em 0;
        }
        .article-body blockquote {
            border-left: 3px solid var(--primary);
            background: var(--card-bg);
            color: var(--muted);
            padding: 16px 20px;
            margin: 1.5em 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .article-body blockquote p {
            margin-bottom: 0;
        }
        .article-body ul,
        .article-body ol {
            padding-left: 1.5em;
            margin-bottom: 1.25em;
        }
        .article-body ul li {
            list-style: none;
            position: relative;
            padding-left: 1.2em;
            margin-bottom: 0.4em;
        }
        .article-body ul li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0.65em;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent);
        }
        .article-body ol li {
            margin-bottom: 0.4em;
        }
        .article-body a {
            color: var(--accent);
            border-bottom: 1px solid rgba(216,178,110,0.3);
            transition: color var(--transition), border-color var(--transition);
        }
        .article-body a:hover {
            color: var(--primary-hover);
            border-color: var(--primary-hover);
        }

        /* Related Cards */
        .related-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .related-card .card-body {
            padding: 16px;
        }
        .related-card .card-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
            line-height: 1.4;
        }
        .related-card .card-text {
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 10px;
            line-height: 1.7;
        }
        .related-card .card-time {
            font-size: 12px;
            color: var(--muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .related-card .card-time i {
            color: var(--accent);
        }

        /* Prev Next Nav */
        .prev-next-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .prev-next-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 18px 20px;
            transition: border-color var(--transition), background var(--transition), transform var(--transition);
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .prev-next-card:hover {
            border-color: var(--accent);
            background: #1E1C22;
            transform: translateY(-2px);
        }
        .prev-next-card .direction {
            font-size: 20px;
            color: var(--muted);
            flex-shrink: 0;
            transition: color var(--transition);
        }
        .prev-next-card:hover .direction {
            color: var(--accent);
        }
        .prev-next-card .pn-content {
            flex: 1;
            min-width: 0;
        }
        .prev-next-card .pn-label {
            font-size: 12px;
            color: var(--muted);
            margin-bottom: 2px;
        }
        .prev-next-card .pn-title {
            font-size: 14px;
            color: var(--text);
            font-weight: 600;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            line-height: 1.4;
        }
        .prev-next-card .pn-placeholder {
            font-size: 14px;
            color: var(--muted);
            font-style: italic;
        }
        .pn-next {
            text-align: right;
        }

        /* Extended Reading */
        .extended-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .extended-card {
            display: flex;
            gap: 14px;
            align-items: center;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 12px;
            transition: border-color var(--transition), background var(--transition), transform var(--transition);
        }
        .extended-card:hover {
            border-color: var(--accent);
            background: #1E1C22;
            transform: translateY(-2px);
        }
        .extended-card img {
            width: 100px;
            height: 70px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            flex-shrink: 0;
        }
        .extended-card .ext-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 4px;
            line-height: 1.4;
        }
        .extended-card .ext-sub {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.5;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #1B191E 0%, #121014 100%);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            text-align: center;
            margin-top: 12px;
        }
        .cta-section h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }
        .cta-section p {
            color: var(--muted);
            font-size: 15px;
            margin-bottom: 22px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Return Entry */
        .return-entry {
            text-align: center;
            padding: 20px 0 8px;
        }

        /* Not Found */
        .not-found-box {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 48px 24px;
            text-align: center;
            margin-bottom: 40px;
        }
        .not-found-box h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--muted);
            margin-bottom: 20px;
        }

        /* Footer */
        .site-footer {
            background-color: #0E0D10;
            border-top: 1px solid var(--border);
            padding: 48px 0 24px;
            margin-top: 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            margin-bottom: 12px;
            font-size: 17px;
        }
        .footer-brand p {
            color: var(--muted);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 0;
        }
        .footer-col h5 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 14px;
            letter-spacing: -0.2px;
        }
        .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: var(--muted);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--primary-hover);
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 18px;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 12px;
            color: var(--muted);
            margin-bottom: 0;
        }

        /* Responsive */
        @media (max-width: 991px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .section {
                padding: 52px 0;
            }
            .article-header h1 {
                font-size: 28px;
            }
        }

        @media (max-width: 767px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--bg);
                border-bottom: 1px solid var(--border);
                flex-direction: column;
                gap: 0;
                padding: 12px 24px;
                box-shadow: 0 8px 24px rgba(0,0,0,0.4);
            }
            .nav-menu.mobile-open {
                display: flex;
            }
            .nav-menu li {
                width: 100%;
                padding: 10px 0;
                border-bottom: 1px solid rgba(42,39,45,0.5);
            }
            .nav-menu li:last-child {
                border-bottom: none;
            }
            .nav-link {
                font-size: 15px;
                display: block;
            }
            .nav-link::after {
                display: none;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .prev-next-grid {
                grid-template-columns: 1fr;
            }
            .extended-grid {
                grid-template-columns: 1fr;
            }
            .article-header h1 {
                font-size: 24px;
            }
            .article-body {
                font-size: 15px;
            }
            .article-body h2 {
                font-size: 19px;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section {
                padding: 40px 0;
            }
            .cta-section {
                padding: 28px 18px;
            }
            .cta-section h3 {
                font-size: 20px;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .logo {
                font-size: 16px;
            }
            .article-meta {
                gap: 10px;
            }
            .extended-card img {
                width: 80px;
                height: 56px;
            }
            .pill-nav .container {
                gap: 6px;
            }
            .pill {
                padding: 5px 11px;
                font-size: 12px;
            }
        }

/* roulang page: category1 */
:root {
            --bg: #121014;
            --card-bg: #1B191E;
            --primary: #C8403A;
            --primary-hover: #D84A42;
            --accent: #D8B26E;
            --text: #F5F2EA;
            --muted: #A9A4A0;
            --border: #2A272D;
            --success: #5B7F6A;
            --danger: #9B4E4A;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-sm: 8px;
            --radius-pill: 999px;
            --shadow: 0 2px 8px rgba(0,0,0,0.22);
            --shadow-hover: 0 8px 24px rgba(0,0,0,0.38);
            --font-base: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --transition: 0.25s ease;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            background-color: var(--bg);
            color: var(--text);
            font-family: var(--font-base);
            font-size: 16px;
            line-height: 1.85;
            letter-spacing: 0.01em;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--text);
            text-decoration: none;
            transition: color var(--transition), border-color var(--transition), background var(--transition);
        }
        a:hover {
            color: var(--primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
        }
        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
            margin-left: auto;
            margin-right: auto;
        }
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background-color: #0F0E12;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .section-sub {
            color: var(--muted);
            font-size: 16px;
            max-width: 720px;
            margin-bottom: 40px;
        }
        .eyebrow {
            display: inline-block;
            font-size: 13px;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 12px;
            border: 1px solid var(--border);
            border-radius: var(--radius-pill);
            padding: 4px 12px;
            background: rgba(216,178,110,0.08);
        }
        .btn-primary-custom {
            background-color: var(--primary);
            color: #F5F2EA;
            border: none;
            border-radius: var(--radius-sm);
            padding: 10px 20px;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
            display: inline-block;
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-hover);
            color: #F5F2EA;
            transform: translateY(-1px);
        }
        .btn-primary-custom:active {
            transform: translateY(0);
        }
        .btn-ghost {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--muted);
            border-radius: var(--radius-sm);
            padding: 10px 20px;
            font-weight: 600;
            transition: border-color var(--transition), color var(--transition), background var(--transition);
            display: inline-block;
        }
        .btn-ghost:hover {
            border-color: var(--accent);
            color: var(--text);
        }
        .card-custom {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            overflow: hidden;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
        }
        .card-img-wrap {
            overflow: hidden;
            position: relative;
        }
        .card-img-wrap img {
            transition: transform var(--transition);
            width: 100%;
            object-fit: cover;
        }
        .card-custom:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .badge-custom {
            display: inline-block;
            font-size: 12px;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border);
            color: var(--muted);
            background: transparent;
            white-space: nowrap;
        }
        .badge-custom.active {
            background: var(--primary);
            color: #F5F2EA;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.15);
        }
        /* Header */
        .site-header {
            background-color: var(--bg);
            border-bottom: 1px solid var(--border);
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo .logo-mark {
            display: inline-block;
            width: 4px;
            height: 20px;
            background-color: var(--accent);
            border-radius: 2px;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-link {
            font-size: 14px;
            color: var(--muted);
            transition: color var(--transition);
            position: relative;
            padding: 4px 0;
        }
        .nav-link.active {
            color: var(--primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -4px;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active::after {
            width: 100%;
        }
        /* Pill Nav */
        .pill-nav {
            background-color: var(--bg);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
        }
        .pill-nav .container {
            display: flex;
            align-items: center;
            gap: 10px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .pill-nav .container::-webkit-scrollbar {
            display: none;
        }
        .pill-nav .pill {
            font-size: 13px;
            border-radius: var(--radius-pill);
            padding: 6px 14px;
            border: 1px solid var(--border);
            color: var(--muted);
            white-space: nowrap;
            transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
        }
        .pill-nav .pill:hover {
            border-color: var(--accent);
            color: var(--text);
        }
        .pill-nav .pill.active {
            background: var(--primary);
            color: #F5F2EA;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.15);
        }
        /* Category Hero */
        .category-hero {
            background: linear-gradient(135deg, #1B191E 0%, #121014 55%, #1B191E 100%);
            border-radius: var(--radius-lg);
            padding: 44px 36px;
            margin-top: 32px;
            margin-bottom: 8px;
            border: 1px solid var(--border);
        }
        .category-hero h1 {
            font-size: 36px;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
            line-height: 1.3;
            color: var(--text);
        }
        .category-hero p {
            color: var(--muted);
            font-size: 16px;
            max-width: 680px;
            line-height: 1.8;
            margin-bottom: 0;
        }
        /* Filter Toolbar */
        .filter-toolbar {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 16px 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            margin: 16px 0 28px;
        }
        .filter-toolbar .form-select {
            background-color: var(--bg);
            border: 1px solid var(--border);
            color: var(--text);
            border-radius: var(--radius-sm);
            padding: 8px 16px;
            font-size: 14px;
            max-width: 200px;
            cursor: pointer;
        }
        .filter-toolbar .form-select:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.12);
            outline: none;
        }
        .filter-chip {
            font-size: 13px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border);
            color: var(--muted);
            background: transparent;
            white-space: nowrap;
            transition: border-color var(--transition), color var(--transition);
        }
        .filter-chip:hover {
            border-color: var(--accent);
            color: var(--text);
        }
        .filter-chip.active {
            background: rgba(200,64,58,0.12);
            border-color: var(--primary);
            color: var(--primary);
        }
        /* Video Grid */
        .video-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }
        .video-card {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            display: block;
        }
        .video-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
            color: var(--text);
        }
        .video-card .card-img-wrap {
            aspect-ratio: 16 / 9;
        }
        .video-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .video-card .card-body {
            padding: 16px 18px;
        }
        .video-card .card-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
            line-height: 1.45;
        }
        .video-card .card-excerpt {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.7;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .video-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
            font-size: 12px;
            color: var(--muted);
        }
        .video-card .card-meta .badge-custom {
            font-size: 11px;
            padding: 3px 10px;
        }
        /* Data Strip */
        .data-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin: 8px 0 8px;
        }
        .data-item {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 18px 20px;
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .data-item .data-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(216,178,110,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 18px;
            flex-shrink: 0;
        }
        .data-item .data-num {
            font-size: 24px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .data-item .data-label {
            font-size: 12px;
            color: var(--muted);
            margin-top: 2px;
        }
        /* Topic Cards */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }
        .topic-card {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            display: block;
        }
        .topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
            color: var(--text);
        }
        .topic-card .card-img-wrap {
            aspect-ratio: 21 / 9;
        }
        .topic-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .topic-card .card-body {
            padding: 18px 20px;
        }
        .topic-card .card-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
        .topic-card .card-excerpt {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        /* Tips List */
        .tips-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .tips-list li {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 16px 20px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 14px;
            color: var(--text);
            line-height: 1.7;
        }
        .tips-list li .tip-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--accent);
            margin-top: 9px;
            flex-shrink: 0;
        }
        /* FAQ */
        .faq-section .accordion-item {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm) !important;
            margin-bottom: 12px;
            overflow: hidden;
        }
        .faq-section .accordion-button {
            background-color: transparent;
            color: var(--text);
            font-weight: 600;
            font-size: 15px;
            padding: 16px 20px;
            box-shadow: none !important;
            border: none !important;
            outline: none !important;
        }
        .faq-section .accordion-button:not(.collapsed) {
            background-color: rgba(200,64,58,0.06);
            color: var(--text);
        }
        .faq-section .accordion-button:focus {
            box-shadow: none !important;
            outline: none !important;
        }
        .faq-section .accordion-button::after {
            filter: brightness(0) invert(0.8);
        }
        .faq-section .accordion-body {
            color: var(--muted);
            font-size: 14px;
            line-height: 1.8;
            padding: 16px 20px;
        }
        /* CTA Section */
        .cta-card {
            background: linear-gradient(135deg, rgba(200,64,58,0.14) 0%, #1B191E 55%, #1B191E 100%);
            border: 1px solid rgba(200,64,58,0.3);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            text-align: center;
        }
        .cta-card h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }
        .cta-card p {
            color: var(--muted);
            font-size: 14px;
            margin-bottom: 20px;
        }
        .cta-card .btn-primary-custom {
            min-width: 180px;
        }
        /* Form */
        .form-control-custom {
            background-color: var(--bg);
            border: 1px solid var(--border);
            color: var(--text);
            border-radius: var(--radius-sm);
            padding: 10px 16px;
            font-size: 14px;
            width: 100%;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .form-control-custom:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(200,64,58,0.12);
            outline: none;
        }
        .form-label {
            font-size: 13px;
            color: var(--muted);
            margin-bottom: 6px;
            display: block;
        }
        .form-group {
            margin-bottom: 16px;
        }
        /* Footer */
        .site-footer {
            background-color: #0E0D10;
            border-top: 1px solid var(--border);
            padding: 48px 0 24px;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            margin-bottom: 12px;
        }
        .footer-brand p {
            color: var(--muted);
            font-size: 13px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 14px;
        }
        .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: var(--muted);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--primary-hover);
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 20px;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 12px;
            color: var(--muted);
            margin: 0;
        }
        /* Responsive */
        @media (max-width: 991px) {
            .video-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-strip {
                grid-template-columns: repeat(2, 1fr);
            }
            .tips-list {
                grid-template-columns: 1fr;
            }
            .category-hero {
                padding: 32px 24px;
            }
            .category-hero h1 {
                font-size: 28px;
            }
        }
        @media (max-width: 767px) {
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .site-header .container {
                flex-direction: column;
                gap: 10px;
            }
            .nav-menu {
                gap: 16px;
                flex-wrap: wrap;
                justify-content: center;
            }
            .pill-nav .container {
                padding-left: 12px;
                padding-right: 12px;
            }
            .category-hero {
                padding: 24px 18px;
                margin-top: 20px;
            }
            .category-hero h1 {
                font-size: 22px;
            }
            .category-hero p {
                font-size: 14px;
            }
            .filter-toolbar {
                flex-direction: column;
                align-items: stretch;
            }
            .filter-toolbar .form-select {
                max-width: 100%;
            }
            .video-grid {
                grid-template-columns: 1fr;
            }
            .topic-grid {
                grid-template-columns: 1fr;
            }
            .data-strip {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .data-item {
                padding: 14px 16px;
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .data-item .data-num {
                font-size: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .cta-card {
                padding: 24px 18px;
            }
        }
        @media (max-width: 520px) {
            .data-strip {
                grid-template-columns: 1fr;
            }
            .nav-menu {
                gap: 12px;
                font-size: 13px;
            }
            .logo {
                font-size: 16px;
            }
        }
        /* fade-up */
        .fade-up {
            opacity: 0;
            transform: translateY(16px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}