/* roulang page: index */
:root {
            --primary: #E8482A;
            --primary-dark: #C93A1F;
            --primary-light: #FFF0EC;
            --secondary: #102A43;
            --secondary-light: #1E3B5C;
            --bg: #F7F4EF;
            --surface: #FFFFFF;
            --text: #1F2933;
            --text-secondary: #52606D;
            --text-muted: #9AA5B1;
            --border: #E5E7EB;
            --success: #3E9B6B;
            --radius-card: 16px;
            --radius-btn: 12px;
            --radius-input: 10px;
            --radius-tag: 8px;
            --shadow-sm: 0 2px 8px rgba(16, 42, 67, 0.06);
            --shadow-md: 0 8px 24px rgba(16, 42, 67, 0.08);
            --shadow-lg: 0 12px 32px rgba(16, 42, 67, 0.14);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --section-padding-desktop: 80px;
            --section-padding-mobile: 48px;
            --container-max: 1180px;
        }

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

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

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.85;
            color: var(--text);
            background-color: var(--bg);
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease, background-color 0.2s ease, opacity 0.2s ease;
        }
        a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
            text-underline-offset: 4px;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        .container-custom {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        section {
            padding: var(--section-padding-desktop) 0;
            position: relative;
            background-color: transparent;
        }
        section.bg-alt {
            background-color: var(--surface);
        }
        section.bg-dark {
            background-color: var(--secondary);
            color: #fff;
        }
        section.bg-gradient-primary {
            background: linear-gradient(135deg, var(--primary) 0%, #C93A1F 100%);
            color: #fff;
        }
        section.bg-warm {
            background-color: var(--bg);
        }

        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            color: var(--primary);
            background: var(--primary-light);
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 1.9rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .section-desc {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-secondary);
            max-width: 760px;
            margin-bottom: 32px;
        }

        .bg-dark .section-title,
        .bg-dark .section-desc,
        .bg-gradient-primary .section-title,
        .bg-gradient-primary .section-desc {
            color: #fff;
        }
        .bg-dark .section-desc,
        .bg-gradient-primary .section-desc {
            color: rgba(255, 255, 255, 0.85);
        }

        /* Header & Nav */
        .site-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 1050;
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(16, 42, 67, 0.08);
        }

        .navbar-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            min-height: 68px;
        }

        .navbar-custom .logo-link {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--secondary);
            letter-spacing: 0.01em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .navbar-custom .logo-link:hover {
            color: var(--primary);
            text-decoration: none;
        }
        .navbar-custom .logo-link .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-links-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links-desktop .nav-item {
            position: relative;
        }
        .nav-links-desktop .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text);
            padding: 12px 16px;
            border-radius: 8px;
            transition: all 0.2s ease;
            display: block;
        }
        .nav-links-desktop .nav-link:hover,
        .nav-links-desktop .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            text-decoration: none;
        }
        .nav-links-desktop .nav-link.active {
            font-weight: 600;
            position: relative;
        }
        .nav-links-desktop .nav-link.active:after {
            content: '';
            display: block;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            margin-top: 4px;
        }

        /* Mega Menu */
        .mega-panel-trigger {
            position: relative;
        }
        .mega-panel {
            display: none;
            position: absolute;
            top: calc(100% + 10px);
            right: 0;
            width: 520px;
            background: var(--surface);
            border-radius: 16px;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border);
            padding: 24px;
            z-index: 1100;
        }
        .mega-panel.show {
            display: block;
            animation: megaFadeIn 0.2s ease;
        }
        @keyframes megaFadeIn {
            from {
                opacity: 0;
                transform: translateY(6px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .mega-panel .mega-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 16px;
        }
        .mega-panel .mega-mini-cards {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-bottom: 16px;
        }
        .mega-panel .mega-mini-card {
            background: var(--bg);
            border-radius: 10px;
            padding: 12px 14px;
        }
        .mega-panel .mega-mini-card .label {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 2px;
        }
        .mega-panel .mega-mini-card .value {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
        }
        .mega-panel .mega-links {
            list-style: none;
            padding: 0;
            margin: 0 0 16px;
        }
        .mega-panel .mega-links li {
            border-bottom: 1px solid var(--border);
        }
        .mega-panel .mega-links li:last-child {
            border-bottom: none;
        }
        .mega-panel .mega-links a {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 8px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-radius: 8px;
        }
        .mega-panel .mega-links a:hover {
            background: var(--primary-light);
            color: var(--primary);
            text-decoration: none;
        }
        .mega-panel .mega-btn {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 8px 18px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 500;
            border: none;
            cursor: pointer;
            transition: background 0.2s ease;
        }
        .mega-panel .mega-btn:hover {
            background: var(--primary-dark);
            text-decoration: none;
            color: #fff;
        }

        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--secondary);
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background 0.2s ease;
        }
        .hamburger-btn:hover {
            background: var(--bg);
        }

        /* Mobile Nav Drawer */
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 1070;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .mobile-nav-overlay.show {
            opacity: 1;
        }
        .mobile-nav-drawer {
            position: fixed;
            top: 0;
            right: -100%;
            width: 300px;
            height: 100vh;
            background: var(--surface);
            z-index: 1080;
            transition: right 0.3s ease;
            overflow-y: auto;
            padding: 20px;
            box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
        }
        .mobile-nav-drawer.open {
            right: 0;
        }
        .mobile-nav-drawer .close-btn {
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text);
            cursor: pointer;
            margin-bottom: 16px;
        }
        .mobile-nav-drawer .nav-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .mobile-nav-drawer .nav-list a {
            display: block;
            padding: 14px 12px;
            font-size: 1.05rem;
            font-weight: 500;
            color: var(--text);
            border-radius: 8px;
            border-bottom: 1px solid var(--border);
        }
        .mobile-nav-drawer .nav-list a:hover,
        .mobile-nav-drawer .nav-list a.active {
            background: var(--primary-light);
            color: var(--primary);
            text-decoration: none;
        }
        .mobile-nav-drawer .nav-list a.active {
            font-weight: 600;
        }

        /* Hero */
        .hero-section {
            padding: 72px 0 60px;
            background: linear-gradient(135deg, rgba(232, 72, 42, 0.06) 0%, rgba(16, 42, 67, 0.04) 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/be371f01cd44da32.jpg') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .hero-section .container-custom {
            position: relative;
            z-index: 1;
        }
        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.22;
            color: var(--secondary);
            letter-spacing: -0.01em;
            margin-bottom: 20px;
        }
        .hero-title .highlight {
            color: var(--primary);
        }
        .hero-desc {
            font-size: 1.1rem;
            line-height: 1.9;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 28px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 32px;
        }
        .btn-primary-custom {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .btn-primary-custom:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(232, 72, 42, 0.3);
            text-decoration: none;
            color: #fff;
        }
        .btn-secondary-custom {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            padding: 10px 26px;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s ease;
            white-space: nowrap;
        }
        .btn-secondary-custom:hover {
            background: var(--primary-light);
            transform: translateY(-1px);
            text-decoration: none;
            color: var(--primary);
        }

        /* Version timeline in Hero */
        .version-timeline {
            display: flex;
            align-items: center;
            gap: 0;
            flex-wrap: wrap;
            background: rgba(255, 255, 255, 0.85);
            border-radius: 14px;
            padding: 16px 20px;
            border: 1px solid var(--border);
            margin-top: 10px;
        }
        .version-timeline .v-node {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }
        .version-timeline .v-node .dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--primary);
            flex-shrink: 0;
        }
        .version-timeline .v-node .dot.gray {
            background: var(--text-muted);
        }
        .version-timeline .v-separator {
            width: 40px;
            height: 2px;
            background: var(--border);
            margin: 0 10px;
            flex-shrink: 0;
        }
        .version-timeline .v-date {
            font-weight: 600;
            color: var(--text);
            margin-right: 4px;
        }

        .hero-subscribe {
            display: flex;
            gap: 10px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .hero-subscribe input {
            flex: 1;
            min-width: 200px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-input);
            padding: 12px 16px;
            font-size: 0.95rem;
            font-family: var(--font-family);
            transition: border 0.2s ease, box-shadow 0.2s ease;
        }
        .hero-subscribe input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(232, 72, 42, 0.15);
        }

        /* Quick entry icons */
        .quick-entry-bar {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 16px;
        }
        .quick-entry-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 18px 16px;
            display: flex;
            align-items: center;
            gap: 12px;
            transition: all 0.3s ease;
            color: var(--text);
        }
        .quick-entry-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
            text-decoration: none;
            color: var(--text);
        }
        .quick-entry-item .icon-wrap {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .quick-entry-item .text-wrap .title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
        }
        .quick-entry-item .text-wrap .sub {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Cards */
        .video-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .video-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(232, 72, 42, 0.2);
        }
        .video-card .card-thumb {
            position: relative;
            padding-top: 56.25%;
            overflow: hidden;
            background: #eee;
        }
        .video-card .card-thumb img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .video-card:hover .card-thumb img {
            transform: scale(1.04);
        }
        .video-card .card-thumb .play-overlay {
            position: absolute;
            inset: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 0, 0, 0.2);
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .video-card:hover .card-thumb .play-overlay {
            opacity: 1;
        }
        .play-overlay .play-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            border: none;
            font-size: 1.2rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.25s ease;
        }
        .play-overlay .play-btn:hover {
            transform: scale(1.1);
        }
        .video-card .card-body-custom {
            padding: 18px 18px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .video-card .card-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            line-height: 1.5;
            margin-bottom: 8px;
        }
        .video-card .card-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 12px;
        }
        .video-card .card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .video-card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: auto;
        }
        .video-card .card-tags .tag {
            background: var(--bg);
            color: var(--text-secondary);
            font-size: 0.75rem;
            padding: 3px 10px;
            border-radius: var(--radius-tag);
            border: 1px solid var(--border);
        }
        .video-card .card-tags .tag.hot {
            background: var(--primary-light);
            color: var(--primary);
            border-color: rgba(232, 72, 42, 0.25);
        }
        .video-card .btn-view {
            display: inline-block;
            margin-top: 12px;
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 500;
            cursor: pointer;
            text-align: center;
            transition: background 0.2s ease;
        }
        .video-card .btn-view:hover {
            background: var(--primary-dark);
            color: #fff;
            text-decoration: none;
        }

        /* Pain point cards */
        .pain-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 24px 22px;
            height: 100%;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }
        .pain-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .pain-card .pain-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: #FEF2EE;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 14px;
        }
        .pain-card .pain-title {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
        }
        .pain-card .pain-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Solution items */
        .solution-item {
            display: flex;
            gap: 16px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 20px;
            height: 100%;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }
        .solution-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .solution-item .s-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.15rem;
            flex-shrink: 0;
        }
        .solution-item .s-text .s-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 4px;
        }
        .solution-item .s-text .s-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Steps */
        .step-item {
            text-align: center;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 28px 20px;
            height: 100%;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
            position: relative;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .step-item .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.4rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
        }
        .step-item .step-title {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
        }
        .step-item .step-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Data stats */
        .stat-block {
            text-align: center;
        }
        .stat-block .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-block .stat-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }
        .bg-dark .stat-block .stat-number,
        .bg-gradient-primary .stat-block .stat-number {
            color: #fff;
        }
        .bg-dark .stat-block .stat-label,
        .bg-gradient-primary .stat-block .stat-label {
            color: rgba(255, 255, 255, 0.8);
        }

        /* Testimonial */
        .testimonial-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 24px;
            height: 100%;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
        }
        .testimonial-card .t-stars {
            color: #F5A623;
            font-size: 0.95rem;
            margin-bottom: 12px;
        }
        .testimonial-card .t-text {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .testimonial-card .t-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card .t-user .t-avatar {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--secondary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 0.95rem;
            flex-shrink: 0;
        }
        .testimonial-card .t-user .t-name {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text);
        }
        .testimonial-card .t-user .t-role {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Tag pills for audience */
        .audience-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 10px 20px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text);
            transition: all 0.25s ease;
        }
        .audience-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }
        .audience-tag i {
            color: var(--primary);
            font-size: 0.9rem;
        }

        /* News cards */
        .news-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .news-card .news-thumb {
            padding-top: 46%;
            position: relative;
            overflow: hidden;
            background: #eee;
        }
        .news-card .news-thumb img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-card .news-body {
            padding: 18px 18px 20px;
            flex: 1;
        }
        .news-card .news-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 6px;
        }
        .news-card .news-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            line-height: 1.5;
            margin-bottom: 8px;
        }
        .news-card .news-excerpt {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Data strip */
        .data-strip {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 24px;
            text-align: center;
        }
        .data-strip .data-item .data-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .data-strip .data-item .data-label {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.75);
        }

        /* Topic cards */
        .topic-card {
            position: relative;
            border-radius: var(--radius-card);
            overflow: hidden;
            height: 200px;
            display: block;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }
        .topic-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .topic-card img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            inset: 0;
        }
        .topic-card .topic-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(0, 0, 0, 0.15) 0%, rgba(0, 0, 0, 0.7) 100%);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 18px;
            color: #fff;
        }
        .topic-card .topic-overlay .topic-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }
        .topic-card .topic-overlay .topic-sub {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.85);
        }

        /* Ranking list */
        .rank-item {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 14px 18px;
            margin-bottom: 12px;
            transition: all 0.25s ease;
            box-shadow: var(--shadow-sm);
        }
        .rank-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .rank-item .rank-num {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: var(--bg);
            color: var(--text-secondary);
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .rank-item.top1 .rank-num {
            background: var(--primary);
            color: #fff;
        }
        .rank-item.top2 .rank-num {
            background: var(--secondary);
            color: #fff;
        }
        .rank-item.top3 .rank-num {
            background: #D97706;
            color: #fff;
        }
        .rank-item .rank-thumb {
            width: 70px;
            height: 46px;
            border-radius: 8px;
            overflow: hidden;
            flex-shrink: 0;
            background: #eee;
        }
        .rank-item .rank-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .rank-item .rank-info {
            flex: 1;
            min-width: 0;
        }
        .rank-item .rank-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 2px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .rank-item .rank-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .rank-item .rank-heat {
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            white-space: nowrap;
        }

        /* Device support */
        .device-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 16px;
        }
        .device-card {
            text-align: center;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 20px 16px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }
        .device-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: rgba(232, 72, 42, 0.2);
        }
        .device-card i {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 10px;
            display: block;
        }
        .device-card .d-name {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
        }
        .device-card .d-desc {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* FAQ */
        .accordion-custom .accordion-item {
            border: 1px solid var(--border);
            border-radius: 12px;
            margin-bottom: 12px;
            background: var(--surface);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .accordion-custom .accordion-header {
            background: transparent;
        }
        .accordion-custom .accordion-button {
            background: transparent;
            border: none;
            padding: 18px 20px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            border-radius: 12px;
            transition: all 0.2s ease;
            font-family: var(--font-family);
            text-align: left;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
        }
        .accordion-custom .accordion-button:hover {
            background: var(--bg);
            text-decoration: none;
        }
        .accordion-custom .accordion-button:focus {
            outline: 2px solid var(--primary);
            outline-offset: -2px;
        }
        .accordion-custom .accordion-button .fa-chevron-down {
            transition: transform 0.3s ease;
            color: var(--text-muted);
        }
        .accordion-custom .accordion-button[aria-expanded="true"] .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .accordion-custom .accordion-collapse {
            border-top: none;
        }
        .accordion-custom .accordion-body {
            padding: 18px 20px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
            border-left: 3px solid var(--primary);
            margin-left: 18px;
            padding-top: 0;
        }

        /* Final CTA */
        .final-cta-section {
            padding: 64px 0 80px;
        }
        .final-cta-card {
            background: linear-gradient(135deg, var(--secondary) 0%, #1E3B5C 100%);
            border-radius: 20px;
            padding: 44px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .final-cta-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/4836d2f577dc371e.webp') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .final-cta-card .cta-content {
            position: relative;
            z-index: 1;
        }
        .final-cta-card .cta-title {
            font-size: 1.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .final-cta-card .cta-sub {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.82);
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .final-cta-card .cta-actions {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-white-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.6);
            padding: 10px 26px;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s ease;
        }
        .btn-white-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            text-decoration: none;
            color: #fff;
        }

        /* Footer */
        .site-footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 32px;
            font-size: 0.9rem;
        }
        .site-footer .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .site-footer .footer-desc {
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.8;
            margin-bottom: 20px;
            max-width: 320px;
        }
        .site-footer .footer-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 10px;
        }
        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
            transition: color 0.2s ease;
        }
        .site-footer ul li a:hover {
            color: #fff;
            text-decoration: none;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 20px;
            margin-top: 32px;
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.55);
        }
        .site-footer .footer-subscribe {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .site-footer .footer-subscribe input {
            flex: 1;
            min-width: 180px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: 8px;
            padding: 10px 14px;
            font-size: 0.9rem;
            color: #fff;
            font-family: var(--font-family);
            transition: border 0.2s ease;
        }
        .site-footer .footer-subscribe input::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }
        .site-footer .footer-subscribe input:focus {
            outline: none;
            border-color: var(--primary);
        }
        .site-footer .btn-footer-sub {
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 8px;
            padding: 10px 18px;
            font-size: 0.9rem;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.2s ease;
        }
        .site-footer .btn-footer-sub:hover {
            background: var(--primary-dark);
        }

        /* Responsive */
        @media (max-width: 1199.98px) {
            .hero-title {
                font-size: 2.4rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
        }

        @media (max-width: 991.98px) {
            section {
                padding: var(--section-padding-mobile) 0;
            }
            .nav-links-desktop {
                display: none;
            }
            .hamburger-btn {
                display: block;
            }
            .mobile-nav-overlay.show {
                display: block;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-section {
                padding: 48px 0 40px;
            }
            .mega-panel {
                width: 100%;
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                border-radius: 0 0 16px 16px;
                border: none;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
                max-height: 70vh;
                overflow-y: auto;
            }
            .version-timeline {
                padding: 12px 14px;
            }
            .version-timeline .v-separator {
                width: 20px;
                margin: 0 6px;
            }
        }

        @media (max-width: 767.98px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
            .hero-title {
                font-size: 1.7rem;
                line-height: 1.3;
            }
            .hero-desc {
                font-size: 0.95rem;
                line-height: 1.8;
            }
            .section-title {
                font-size: 1.4rem;
                line-height: 1.35;
            }
            .section-desc {
                font-size: 0.95rem;
            }
            .quick-entry-bar {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .quick-entry-item {
                padding: 14px 12px;
                gap: 8px;
            }
            .quick-entry-item .icon-wrap {
                width: 36px;
                height: 36px;
                font-size: 1rem;
            }
            .data-strip {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-block .stat-number {
                font-size: 1.8rem;
            }
            .topic-card {
                height: 160px;
            }
            .device-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .final-cta-card {
                padding: 32px 22px;
                border-radius: 16px;
            }
            .final-cta-card .cta-title {
                font-size: 1.5rem;
            }
            .btn-primary-custom,
            .btn-secondary-custom {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
            .hero-actions {
                gap: 8px;
            }
            .version-timeline {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .version-timeline .v-separator {
                display: none;
            }
            .hero-subscribe {
                flex-direction: column;
            }
            .hero-subscribe input {
                min-width: 100%;
            }
            .rank-item {
                padding: 12px 14px;
                gap: 10px;
            }
            .rank-item .rank-thumb {
                width: 56px;
                height: 38px;
            }
            .rank-item .rank-num {
                width: 32px;
                height: 32px;
                font-size: 0.95rem;
            }
            .site-footer {
                padding: 40px 0 20px;
            }
            .site-footer .footer-desc {
                max-width: 100%;
            }
        }

        @media (max-width: 519.98px) {
            .quick-entry-bar {
                grid-template-columns: 1fr;
            }
            .data-strip {
                grid-template-columns: 1fr;
            }
            .device-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-title {
                font-size: 1.5rem;
            }
            .step-item {
                padding: 20px 14px;
            }
            .step-item .step-number {
                width: 44px;
                height: 44px;
                font-size: 1.1rem;
            }
            .audience-tag {
                font-size: 0.85rem;
                padding: 8px 14px;
            }
        }

/* roulang page: category1 */
:root {
  --primary: #E8482A;
  --primary-dark: #C93A1F;
  --primary-light: #FFF0EC;
  --secondary: #102A43;
  --secondary-light: #1E3B5C;
  --bg: #F7F4EF;
  --surface: #FFFFFF;
  --text: #1F2933;
  --text-secondary: #52606D;
  --text-muted: #9AA5B1;
  --border: #E5E7EB;
  --success: #3E9B6B;
  --radius-card: 16px;
  --radius-btn: 12px;
  --radius-input: 10px;
  --radius-tag: 8px;
  --shadow-sm: 0 2px 8px rgba(16, 42, 67, 0.06);
  --shadow-md: 0 8px 24px rgba(16, 42, 67, 0.08);
  --shadow-lg: 0 12px 32px rgba(16, 42, 67, 0.14);
  --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --section-padding-desktop: 80px;
  --section-padding-mobile: 48px;
  --container-max: 1180px;
}

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  background-color: var(--bg);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
  text-underline-offset: 4px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

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

.container-custom {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

section {
  padding: var(--section-padding-desktop) 0;
  position: relative;
  background-color: transparent;
}

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

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

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

.section-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-secondary);
  max-width: 760px;
  margin-bottom: 32px;
}

.bg-dark .section-title,
.bg-dark .section-desc {
  color: #fff;
}

.bg-dark .section-desc {
  color: rgba(255, 255, 255, 0.85);
}

/* Header & Nav */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1050;
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(16, 42, 67, 0.08);
}

.navbar-custom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 20px;
  min-height: 68px;
  flex-wrap: nowrap;
}

.navbar-custom .logo-link {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
  letter-spacing: 0.01em;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.navbar-custom .logo-link:hover {
  color: var(--primary);
  text-decoration: none;
}

.navbar-custom .logo-link .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.nav-links-desktop {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links-desktop .nav-item {
  position: relative;
}

.nav-links-desktop .nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.nav-links-desktop .nav-link:hover,
.nav-links-desktop .nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
  text-decoration: none;
}

/* Mega Panel */
.mega-panel-trigger {
  position: relative;
}

.mega-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 420px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  z-index: 1100;
}

.mega-panel-trigger:hover .mega-panel,
.mega-panel-trigger:focus-within .mega-panel,
.mega-panel-trigger.active .mega-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 16px;
}

.mega-mini-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.mega-mini-card {
  background: var(--bg);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}

.mega-mini-card .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.mega-mini-card .value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.mega-links {
  list-style: none;
  padding: 0;
  margin: 0 0 16px 0;
}

.mega-links li {
  margin-bottom: 8px;
}

.mega-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.mega-links a:hover {
  background: var(--primary-light);
  color: var(--primary);
  text-decoration: none;
}

.mega-btn {
  display: block;
  width: 100%;
  text-align: center;
  background: var(--primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-btn);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s;
}

.mega-btn:hover {
  background: var(--primary-dark);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

.hamburger-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: all 0.2s;
}

.hamburger-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
}

/* Mobile nav */
.mobile-menu {
  display: none;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 12px 20px;
  position: absolute;
  top: 68px;
  left: 0;
  right: 0;
  z-index: 1090;
  box-shadow: var(--shadow-md);
}

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

.mobile-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-menu a {
  display: block;
  padding: 12px 4px;
  font-size: 1rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.mobile-menu a:last-child {
  border-bottom: none;
}

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

.mobile-mega {
  margin-top: 8px;
  background: var(--bg);
  border-radius: 10px;
  padding: 14px;
}

.mobile-mega a {
  border-bottom: none;
  padding: 6px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Breadcrumb */
.breadcrumb-wrap {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.breadcrumb-custom {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb-custom a {
  color: var(--text-secondary);
}

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

.breadcrumb-custom .sep {
  color: var(--text-muted);
}

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

/* Category Hero */
.category-hero {
  padding: 48px 0 40px;
  background-image: url('/assets/images/be371f01cd44da32.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  color: #fff;
}

.category-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(16, 42, 67, 0.92) 0%, rgba(16, 42, 67, 0.75) 60%, rgba(232, 72, 42, 0.55) 100%);
  z-index: 1;
}

.category-hero .container-custom {
  position: relative;
  z-index: 2;
}

.category-hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 12px;
  color: #fff;
}

.category-hero .hero-desc {
  font-size: 1.05rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
  max-width: 680px;
}

.category-hero .hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.category-hero .hero-stat {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.9);
}

.category-hero .hero-stat i {
  color: var(--primary);
  font-size: 1rem;
}

/* Filter bar */
.filter-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.filter-bar .filter-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.filter-bar .filter-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  flex: 1;
}

.filter-tag {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.filter-tag:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.filter-tag.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.filter-bar .filter-count {
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Video cards grid */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.video-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.video-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.video-card .card-cover {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.video-card .card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card:hover .card-cover img {
  transform: scale(1.04);
}

.video-card .card-cover .duration-badge {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 6px;
  font-weight: 500;
}

.video-card .card-cover .quality-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.video-card .card-body {
  padding: 14px 16px 16px;
}

.video-card .card-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card .card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.video-card .card-tags .tag {
  font-size: 0.72rem;
  color: var(--text-secondary);
  background: var(--bg);
  padding: 2px 10px;
  border-radius: 6px;
}

.video-card .card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.video-card .btn-play {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-btn);
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.video-card .btn-play:hover {
  background: var(--primary-dark);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

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

.btn-load-more {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px 32px;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-load-more:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

/* Related categories */
.related-cats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.related-cat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 20px;
  text-align: center;
  transition: all 0.3s;
  display: block;
}

.related-cat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
  border-color: var(--primary);
}

.related-cat-card .cat-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin: 0 auto 12px;
}

.related-cat-card .cat-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.related-cat-card .cat-count {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Subscribe section */
.subscribe-card {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.subscribe-card .subscribe-info {
  flex: 1;
  min-width: 260px;
}

.subscribe-card .subscribe-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.subscribe-card .subscribe-desc {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
}

.subscribe-card .subscribe-form {
  display: flex;
  gap: 10px;
  flex: 1;
  min-width: 260px;
}

.subscribe-card .subscribe-form input {
  flex: 1;
  min-width: 0;
  padding: 12px 16px;
  border-radius: var(--radius-input);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 0.9rem;
  outline: none;
  transition: all 0.2s;
}

.subscribe-card .subscribe-form input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.subscribe-card .subscribe-form input:focus {
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.15);
}

.btn-subscribe {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: var(--radius-btn);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-subscribe:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* Play help */
.help-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.help-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.help-item .help-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.help-item .help-content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.help-item .help-content p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.7;
}

/* Bottom CTA */
.bottom-cta {
  background: linear-gradient(135deg, var(--primary) 0%, #C93A1F 100%);
  border-radius: var(--radius-card);
  padding: 48px 40px;
  text-align: center;
  color: #fff;
}

.bottom-cta .cta-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.bottom-cta .cta-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 24px;
}

.btn-cta-primary {
  background: #fff;
  color: var(--primary);
  border: none;
  padding: 14px 32px;
  border-radius: var(--radius-btn);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s;
  display: inline-block;
}

.btn-cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
  text-decoration: none;
  color: var(--primary-dark);
}

.btn-cta-secondary {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
  padding: 14px 28px;
  border-radius: var(--radius-btn);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s;
  display: inline-block;
}

.btn-cta-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  text-decoration: none;
}

/* Footer */
.site-footer {
  background: var(--secondary);
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 24px;
}

.footer-brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}

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

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

.site-footer ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.site-footer ul li a:hover {
  color: var(--primary);
  text-decoration: none;
}

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

.footer-subscribe input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  border-radius: var(--radius-input);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 0.85rem;
  outline: none;
}

.footer-subscribe input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.footer-subscribe input:focus {
  border-color: var(--primary);
}

.btn-footer-sub {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-input);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-footer-sub:hover {
  background: var(--primary-dark);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  margin-top: 40px;
  padding-top: 20px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
  text-align: center;
}

/* Responsive */
@media (max-width: 1199px) {
  .video-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .related-cats {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 991px) {
  .nav-links-desktop {
    display: none;
  }
  .hamburger-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .related-cats {
    grid-template-columns: repeat(2, 1fr);
  }
  .help-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .category-hero h1 {
    font-size: 1.8rem;
  }
  section {
    padding: 60px 0;
  }
}

@media (max-width: 767px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .related-cats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .help-grid {
    grid-template-columns: 1fr;
  }
  .filter-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  .category-hero {
    padding: 32px 0;
  }
  .category-hero h1 {
    font-size: 1.5rem;
  }
  .subscribe-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 28px 20px;
  }
  .subscribe-card .subscribe-form {
    width: 100%;
    flex-direction: column;
  }
  .bottom-cta {
    padding: 32px 20px;
  }
  .bottom-cta .cta-title {
    font-size: 1.3rem;
  }
  .navbar-custom .logo-link {
    font-size: 1.05rem;
  }
  .navbar-custom .logo-link .logo-icon {
    width: 30px;
    height: 30px;
    font-size: 0.9rem;
  }
  .section-title {
    font-size: 1.5rem;
  }
  section {
    padding: 48px 0;
  }
}

@media (max-width: 575px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
  .related-cats {
    grid-template-columns: 1fr;
  }
  .category-hero .hero-stats {
    gap: 16px;
    flex-direction: column;
  }
  .video-card .card-body {
    padding: 12px;
  }
  .video-card .card-title {
    font-size: 0.88rem;
  }
  .filter-tag {
    padding: 5px 10px;
    font-size: 0.78rem;
  }
  .filter-bar .filter-label {
    font-size: 0.82rem;
  }
  .mega-panel {
    width: 100%;
    right: auto;
    left: 0;
    top: calc(100% + 6px);
  }
}

/* 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}