/* roulang page: index */
:root {
            --primary: #7C3AED;
            --primary-hover: #8B5CF6;
            --secondary: #00E5FF;
            --accent: #FF2D78;
            --bg: #0A0A12;
            --bg-secondary: #12121E;
            --bg-card: #16162A;
            --bg-dark: #0D0D18;
            --text-primary: #FFFFFF;
            --text-body: #B8B8CC;
            --text-secondary: #7A7A9A;
            --text-disabled: #4A4A62;
            --border: rgba(0, 229, 255, 0.15);
            --border-hover: rgba(0, 229, 255, 0.4);
            --success: #00CE7A;
            --warning: #FFB020;
            --error: #FF4D5A;
            --radius-card: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.25);
            --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
            --section-gap: 84px;
            --card-gap: 24px;
            --container-padding: 24px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 15px;
            letter-spacing: 0.01em;
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--container-padding);
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 10, 18, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(0, 229, 255, 0.12);
            transition: background 0.3s ease;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            letter-spacing: 0.02em;
            flex-shrink: 0;
        }

        .logo-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 12px var(--secondary);
            flex-shrink: 0;
        }
        .logo-text {
            background: linear-gradient(135deg, #FFFFFF 40%, #00E5FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

        .nav-desktop a {
            display: inline-block;
            padding: 10px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-primary);
            transition: all 0.3s ease;
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        .nav-desktop a:hover {
            color: var(--secondary);
            background: rgba(0, 229, 255, 0.06);
        }
        .nav-desktop a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            cursor: pointer;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }
        .nav-toggle:hover {
            background: rgba(0, 229, 255, 0.08);
            border-color: var(--secondary);
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 10, 18, 0.98);
            z-index: 999;
            flex-direction: column;
            padding: 100px 32px 40px;
            overflow-y: auto;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        .mobile-menu.open {
            display: flex;
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            display: block;
            padding: 18px 0;
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            letter-spacing: 0.02em;
            transition: all 0.3s ease;
            counter-increment: menu-item;
        }
        .mobile-menu a::before {
            content: "0" counter(menu-item);
            font-size: 14px;
            color: var(--secondary);
            margin-right: 12px;
            font-weight: 500;
            font-family: var(--font-mono);
        }
        .mobile-menu a:hover {
            color: var(--secondary);
            border-left: 3px solid var(--secondary);
            padding-left: 16px;
        }
        .mobile-menu a.active {
            color: var(--secondary);
        }
        .mobile-menu-close {
            position: absolute;
            top: 24px;
            right: 24px;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--text-primary);
            cursor: pointer;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.3s ease;
        }
        .mobile-menu-close:hover {
            color: var(--secondary);
            border-color: var(--secondary);
        }

        /* Hero Section */
        .hero {
            padding-top: 150px;
            padding-bottom: 80px;
            background-color: var(--bg);
            position: relative;
            overflow: hidden;
            min-height: 90vh;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 20%, rgba(124, 58, 237, 0.22) 0%, transparent 60%),
                radial-gradient(ellipse at 20% 70%, rgba(0, 229, 255, 0.12) 0%, transparent 50%),
                radial-gradient(ellipse at 90% 80%, rgba(255, 45, 120, 0.08) 0%, transparent 40%);
            pointer-events: none;
        }
        .hero::after {
            content: "";
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
            background-size: 48px 48px;
            pointer-events: none;
            -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
            mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 48px;
            align-items: center;
        }
        .hero-content {
            max-width: 100%;
        }

        .hero-badge {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 999px;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.25);
            color: var(--secondary);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.04em;
            margin-bottom: 20px;
        }

        .hero h1 {
            font-size: 46px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            margin-bottom: 20px;
        }
        .hero h1 .highlight {
            color: var(--secondary);
            text-shadow: 0 0 30px rgba(0, 229, 255, 0.35);
        }

        .hero-subtitle {
            font-size: 17px;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 28px;
            max-width: 560px;
        }

        .hero-cta {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 32px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 13px 30px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.02em;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 1px solid transparent;
            text-align: center;
            min-height: 48px;
        }
        .btn:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 20px rgba(124, 58, 237, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(255, 45, 120, 0.4);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-secondary {
            background: transparent;
            color: var(--secondary);
            border-color: var(--secondary);
        }
        .btn-secondary:hover {
            background: rgba(0, 229, 255, 0.08);
            transform: translateY(-2px);
        }
        .btn-text {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--secondary);
            font-weight: 600;
            font-size: 14px;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.3s ease;
        }
        .btn-text:hover {
            border-bottom-color: var(--secondary);
            color: #fff;
        }

        .hero-trust {
            display: flex;
            gap: 0;
            flex-wrap: wrap;
            align-items: center;
        }
        .hero-trust-item {
            display: flex;
            flex-direction: column;
            padding: 0 24px;
            border-left: 1px solid rgba(255, 255, 255, 0.12);
            font-size: 13px;
            color: var(--text-secondary);
            min-width: 100px;
        }
        .hero-trust-item:first-child {
            border-left: none;
            padding-left: 0;
        }
        .hero-trust-item .num {
            font-size: 28px;
            font-weight: 700;
            color: var(--secondary);
            font-family: var(--font-mono);
            line-height: 1.2;
        }
        .hero-trust-item .label {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .hero-visual {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 380px;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            border: 1px solid rgba(0, 229, 255, 0.15);
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: flex-end;
        }
        .hero-visual::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 30%, rgba(10, 10, 18, 0.85) 100%);
        }
        .hero-visual-label {
            position: relative;
            z-index: 2;
            padding: 20px 24px;
            color: #fff;
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.03em;
        }

        /* Section Shared */
        section {
            padding: var(--section-gap) 0;
            position: relative;
        }
        .section-header {
            margin-bottom: 42px;
        }
        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--secondary);
            letter-spacing: 0.06em;
            text-transform: uppercase;
            margin-bottom: 10px;
        }
        .section-header h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.3;
            letter-spacing: -0.03em;
            margin-bottom: 12px;
        }
        .section-header p {
            font-size: 15px;
            color: var(--text-body);
            max-width: 640px;
            line-height: 1.75;
        }
        .section-header.center {
            text-align: center;
        }
        .section-header.center p {
            margin: 0 auto;
        }

        /* Services / Features */
        .services-grid {
            display: grid;
            grid-template-columns: 1.3fr 1fr 1fr;
            grid-template-rows: auto auto;
            gap: var(--card-gap);
        }
        .service-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: all 0.4s ease;
            position: relative;
            overflow: hidden;
        }
        .service-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity 0.4s ease;
        }
        .service-card:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .service-card:hover::before {
            opacity: 1;
        }
        .service-card.wide {
            grid-row: span 2;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .service-card.wide .service-desc {
            margin-bottom: 20px;
        }
        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: rgba(124, 58, 237, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 16px;
            color: var(--secondary);
            border: 1px solid rgba(0, 229, 255, 0.2);
        }
        .service-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .service-desc {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 12px;
        }

        /* Stats Band */
        .stats-band {
            background: var(--bg-dark);
            border-top: 1px solid rgba(0, 229, 255, 0.1);
            border-bottom: 1px solid rgba(0, 229, 255, 0.1);
            padding: 56px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
        }
        .stat-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            padding: 12px 20px;
            border-right: 1px solid rgba(0, 229, 255, 0.12);
        }
        .stat-item:last-child {
            border-right: none;
        }
        .stat-number {
            font-size: 44px;
            font-weight: 700;
            font-family: var(--font-mono);
            color: var(--secondary);
            line-height: 1.1;
            letter-spacing: -0.02em;
            text-shadow: 0 0 24px rgba(0, 229, 255, 0.25);
        }
        .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 6px;
            letter-spacing: 0.04em;
        }

        /* News / Dynamic module */
        .news-section {
            background: var(--bg);
        }
        .news-layout {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 36px;
        }
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-item {
            display: flex;
            gap: 16px;
            padding: 18px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            transition: all 0.3s ease;
            align-items: flex-start;
        }
        .news-item:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-card);
            transform: translateX(4px);
        }
        .news-item .news-date {
            font-family: var(--font-mono);
            font-size: 12px;
            color: var(--text-secondary);
            white-space: nowrap;
            padding-top: 3px;
            min-width: 64px;
        }
        .news-item h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.5;
        }
        .news-item h3 a:hover {
            color: var(--secondary);
        }
        .news-item .news-summary {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
        }
        .news-recommend {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            align-self: start;
            position: sticky;
            top: 90px;
        }
        .news-recommend h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 18px;
            padding-bottom: 12px;
            border-bottom: 1px solid rgba(0, 229, 255, 0.12);
        }
        .news-recommend ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .news-recommend ul li {
            display: flex;
            align-items: baseline;
            gap: 10px;
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
        }
        .news-recommend ul li::before {
            content: "→";
            color: var(--secondary);
            font-weight: 700;
            flex-shrink: 0;
        }
        .news-recommend a {
            color: var(--text-body);
            transition: color 0.3s ease;
        }
        .news-recommend a:hover {
            color: var(--secondary);
        }

        /* Brand intro */
        .brand-section {
            background: var(--bg-secondary);
            border-top: 1px solid rgba(0, 229, 255, 0.08);
            border-bottom: 1px solid rgba(0, 229, 255, 0.08);
        }
        .brand-intro {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .brand-intro h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .brand-intro p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.85;
            margin-bottom: 12px;
        }
        .brand-intro-visual {
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 280px;
            background-image: url('/assets/images/coverpic/cover-1.webp');
            background-size: cover;
            background-position: center;
            border: 1px solid rgba(0, 229, 255, 0.15);
            box-shadow: var(--shadow-card);
        }

        /* User Reviews / Testimonials */
        .reviews-section {
            background: var(--bg-dark);
        }
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }
        .review-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 24px 22px;
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        .review-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
        }
        .review-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(124, 58, 237, 0.25);
            border: 1px solid rgba(0, 229, 255, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--secondary);
            font-size: 16px;
            flex-shrink: 0;
        }
        .review-author-info {
            flex: 1;
        }
        .review-author-info .author-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .review-author-info .author-title {
            font-size: 12px;
            color: var(--text-secondary);
        }
        .review-text {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.75;
            flex: 1;
        }
        .review-stars {
            display: flex;
            gap: 4px;
            margin-top: 14px;
            color: var(--warning);
            font-size: 14px;
        }

        /* Solutions / Plans */
        .solutions-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--card-gap);
        }
        .solution-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        .solution-card:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-hover);
        }
        .solution-card.featured {
            border-color: rgba(124, 58, 237, 0.45);
            background: linear-gradient(160deg, rgba(124, 58, 237, 0.1) 0%, var(--bg-card) 50%);
        }
        .solution-card h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .solution-card .solution-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--secondary);
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }
        .solution-card ul {
            list-style: none;
            margin: 16px 0 24px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex: 1;
        }
        .solution-card ul li {
            font-size: 14px;
            color: var(--text-body);
            padding-left: 24px;
            position: relative;
            line-height: 1.6;
        }
        .solution-card ul li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--success);
            font-weight: 700;
            font-size: 14px;
        }

        /* Partners / Capability tags */
        .partners-section {
            background: var(--bg);
        }
        .partners-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        .partner-tag {
            display: flex;
            flex-direction: column;
            gap: 6px;
            padding: 20px 18px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            transition: all 0.3s ease;
            text-align: center;
        }
        .partner-tag:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-card);
            transform: translateY(-2px);
        }
        .partner-tag .partner-name {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .partner-tag .partner-desc {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* FAQ */
        .faq-section {
            background: var(--bg-secondary);
        }
        .faq-container {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .faq-item.open {
            border-color: rgba(0, 229, 255, 0.35);
            box-shadow: 0 4px 20px rgba(0, 229, 255, 0.08);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            gap: 12px;
            transition: color 0.3s ease;
            letter-spacing: 0.01em;
        }
        .faq-question:hover {
            color: var(--secondary);
        }
        .faq-question .faq-indicator {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--secondary);
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
            transition: all 0.3s ease;
        }
        .faq-item.open .faq-indicator {
            background: rgba(0, 229, 255, 0.18);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 20px;
        }
        .faq-item.open .faq-answer {
            max-height: 600px;
            padding: 0 20px 18px;
        }
        .faq-answer p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.75;
            background: rgba(124, 58, 237, 0.04);
            padding: 14px 16px;
            border-radius: var(--radius-sm);
            border-left: 3px solid var(--primary);
        }

        /* Contact / CTA */
        .contact-section {
            background: var(--bg);
            position: relative;
        }
        .contact-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(124, 58, 237, 0.12) 0%, transparent 60%);
            pointer-events: none;
        }
        .contact-layout {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 48px;
            position: relative;
            z-index: 2;
        }
        .contact-info h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }
        .contact-info p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .contact-details {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .contact-details .detail-item {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 14px;
            color: var(--text-body);
        }
        .contact-details .detail-item .detail-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(124, 58, 237, 0.15);
            border: 1px solid rgba(0, 229, 255, 0.18);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--secondary);
            flex-shrink: 0;
        }
        .contact-details .detail-item .detail-value {
            color: var(--text-primary);
            font-weight: 500;
        }

        .contact-form {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-card);
        }
        .form-group {
            margin-bottom: 18px;
        }
        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            letter-spacing: 0.02em;
        }
        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            background: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.1);
            color: var(--text-primary);
            font-size: 14px;
            transition: all 0.3s ease;
            letter-spacing: 0.01em;
        }
        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.12);
        }
        .form-group textarea {
            min-height: 120px;
            resize: vertical;
        }
        .form-group select {
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2300E5FF' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 16px center;
            cursor: pointer;
        }
        .form-hint {
            font-size: 12px;
            color: var(--text-secondary);
            margin-top: 6px;
            line-height: 1.5;
        }

        /* Footer */
        .site-footer {
            background: #07070D;
            border-top: 1px solid rgba(124, 58, 237, 0.3);
            padding: 56px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            font-size: 20px;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.03em;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-secondary);
            transition: color 0.3s ease;
            line-height: 1.5;
        }
        .footer-col ul li a:hover {
            color: var(--secondary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            text-align: center;
            font-size: 12px;
            color: var(--text-secondary);
            line-height: 2;
        }
        .footer-bottom a {
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }
        .footer-bottom .footer-sep {
            margin: 0 8px;
            opacity: 0.4;
        }

        /* Responsive */
        @media (max-width: 1023px) {
            :root {
                --section-gap: 64px;
            }
            .hero .container {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero {
                padding-top: 120px;
                min-height: auto;
            }
            .hero h1 {
                font-size: 36px;
            }
            .hero-visual {
                min-height: 260px;
            }
            .services-grid {
                grid-template-columns: 1fr 1fr;
            }
            .service-card.wide {
                grid-row: span 1;
                grid-column: span 2;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .stat-item {
                border-right: none;
            }
            .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .partners-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .brand-intro {
                grid-template-columns: 1fr;
            }
            .news-layout {
                grid-template-columns: 1fr;
            }
            .news-recommend {
                position: static;
            }
            .contact-layout {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr 1fr;
            }
            .footer-brand {
                grid-column: span 4;
            }
        }

        @media (max-width: 767px) {
            :root {
                --section-gap: 48px;
                --container-padding: 18px;
            }
            .header-inner {
                padding: 10px 0;
            }
            .nav-desktop {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .hero {
                padding-top: 100px;
                padding-bottom: 48px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-visual {
                min-height: 200px;
            }
            .hero-trust {
                flex-wrap: wrap;
                gap: 12px;
            }
            .hero-trust-item {
                padding: 0 12px;
                min-width: auto;
            }
            .hero-trust-item .num {
                font-size: 22px;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .services-grid {
                grid-template-columns: 1fr;
            }
            .service-card.wide {
                grid-column: span 1;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .stat-number {
                font-size: 32px;
            }
            .reviews-grid {
                grid-template-columns: 1fr;
            }
            .partners-grid {
                grid-template-columns: 1fr;
            }
            .solutions-grid {
                grid-template-columns: 1fr;
            }
            .news-item {
                flex-direction: column;
                gap: 8px;
            }
            .news-item .news-date {
                min-width: auto;
            }
            .contact-form {
                padding: 24px 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-brand {
                grid-column: span 2;
            }
            .btn {
                padding: 12px 22px;
                font-size: 14px;
                min-height: 44px;
                width: 100%;
            }
            .btn-secondary {
                width: 100%;
            }
            .hero-cta {
                flex-direction: column;
                gap: 10px;
            }
            .hero-cta .btn {
                width: 100%;
            }
            .review-card {
                padding: 20px 18px;
            }
            .solution-card {
                padding: 24px 20px;
            }
            .faq-question {
                font-size: 14px;
                padding: 14px 16px;
            }
        }

        @media (max-width: 479px) {
            :root {
                --section-gap: 40px;
                --container-padding: 14px;
            }
            .hero h1 {
                font-size: 24px;
            }
            .stat-number {
                font-size: 26px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-brand {
                grid-column: span 1;
            }
            .logo {
                font-size: 18px;
            }
            .section-header h2 {
                font-size: 20px;
            }
            .btn {
                width: 100%;
            }
            .hero-trust {
                flex-direction: column;
                align-items: flex-start;
            }
            .hero-trust-item {
                border-left: none;
                padding-left: 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                padding-bottom: 8px;
                width: 100%;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #7C3AED;
            --primary-hover: #8B5CF6;
            --secondary: #00E5FF;
            --accent: #FF2D78;
            --bg: #0A0A12;
            --bg-secondary: #12121E;
            --bg-card: #16162A;
            --bg-dark: #0D0D18;
            --text-primary: #FFFFFF;
            --text-body: #B8B8CC;
            --text-secondary: #7A7A9A;
            --text-disabled: #4A4A62;
            --border: rgba(0, 229, 255, 0.15);
            --border-hover: rgba(0, 229, 255, 0.4);
            --success: #00CE7A;
            --warning: #FFB020;
            --error: #FF4D5A;
            --radius-card: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.25);
            --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
            --section-gap: 72px;
            --card-gap: 24px;
            --container-padding: 24px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 15px;
            letter-spacing: 0.01em;
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--container-padding);
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 10, 18, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(0, 229, 255, 0.12);
            transition: background 0.3s ease;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            letter-spacing: 0.02em;
            flex-shrink: 0;
        }

        .logo-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 12px var(--secondary);
            flex-shrink: 0;
        }

        .logo-text {
            background: linear-gradient(135deg, #FFFFFF 40%, #00E5FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

        .nav-desktop a {
            display: inline-block;
            padding: 10px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-primary);
            transition: all 0.3s ease;
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        .nav-desktop a:hover {
            color: var(--secondary);
            background: rgba(0, 229, 255, 0.06);
        }

        .nav-desktop a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            cursor: pointer;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }

        .nav-toggle:hover {
            background: rgba(0, 229, 255, 0.08);
            border-color: var(--secondary);
        }

        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 10, 18, 0.98);
            z-index: 999;
            flex-direction: column;
            padding: 100px 32px 40px;
            overflow-y: auto;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }

        .mobile-menu.open {
            display: flex;
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-menu a {
            display: block;
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            padding: 16px 0;
            border-bottom: 1px solid rgba(0, 229, 255, 0.1);
            transition: all 0.3s ease;
            letter-spacing: 0.03em;
            position: relative;
            padding-left: 40px;
        }

        .mobile-menu a::before {
            content: attr(data-index);
            position: absolute;
            left: 0;
            font-size: 14px;
            color: var(--secondary);
            font-weight: 400;
            top: 50%;
            transform: translateY(-50%);
        }

        .mobile-menu a:hover {
            color: var(--secondary);
            background: rgba(0, 229, 255, 0.04);
            padding-left: 48px;
        }

        .mobile-menu a.active {
            color: var(--secondary);
            background: rgba(124, 58, 237, 0.12);
        }

        /* Page Hero */
        .page-hero {
            padding: 140px 0 48px;
            position: relative;
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .page-hero::before {
            content: "";
            position: absolute;
            top: -30%;
            right: -15%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(124, 58, 237, 0.18), transparent 65%);
            pointer-events: none;
        }

        .page-hero::after {
            content: "";
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.08), transparent 60%);
            pointer-events: none;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

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

        .breadcrumb .current {
            color: var(--secondary);
        }

        .page-hero h1 {
            font-size: 44px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.25;
            letter-spacing: -0.5px;
            margin-bottom: 20px;
            position: relative;
            z-index: 1;
        }

        .page-hero h1 .highlight {
            color: var(--secondary);
        }

        .page-hero .lead {
            font-size: 17px;
            color: var(--text-body);
            max-width: 720px;
            line-height: 1.8;
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
        }

        .hero-stats {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .hero-stat .num {
            font-family: var(--font-mono);
            font-size: 28px;
            font-weight: 700;
            color: var(--secondary);
            letter-spacing: -0.03em;
        }

        .hero-stat .label {
            font-size: 13px;
            color: var(--text-secondary);
        }

        /* Filter Pills */
        .filter-bar {
            padding: 28px 0;
            border-bottom: 1px solid var(--border);
            background: var(--bg-dark);
            position: sticky;
            top: 68px;
            z-index: 100;
        }

        .filter-pills {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
        }

        .filter-pill {
            padding: 8px 20px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-body);
            background: transparent;
            border: 1px solid var(--border);
            cursor: pointer;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .filter-pill:hover {
            color: var(--secondary);
            border-color: var(--secondary);
            background: rgba(0, 229, 255, 0.06);
        }

        .filter-pill.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        /* News List */
        .news-section {
            padding: var(--section-gap) 0;
            background: var(--bg);
        }

        .news-list {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .news-item {
            display: grid;
            grid-template-columns: 300px 1fr;
            gap: 28px;
            background: var(--bg-card);
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: all 0.35s ease;
            padding: 0;
        }

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

        .news-item.reverse {
            grid-template-columns: 1fr 300px;
        }

        .news-item.reverse .news-image {
            order: 2;
        }

        .news-item.reverse .news-content {
            order: 1;
        }

        .news-image {
            overflow: hidden;
            min-height: 200px;
            position: relative;
        }

        .news-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .news-item:hover .news-image img {
            transform: scale(1.05);
        }

        .news-content {
            padding: 24px 28px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: 12px;
        }

        .news-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .news-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 12px;
            color: var(--secondary);
            border: 1px solid var(--border);
            background: rgba(0, 229, 255, 0.04);
            white-space: nowrap;
        }

        .news-date {
            font-size: 12px;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .news-content h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            transition: color 0.3s ease;
            cursor: pointer;
        }

        .news-content h3:hover {
            color: var(--secondary);
        }

        .news-content .excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-content .read-more {
            font-size: 14px;
            font-weight: 600;
            color: var(--secondary);
            align-self: flex-start;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .news-content .read-more:hover {
            color: var(--accent);
            text-decoration: underline;
        }

        /* Pagination */
        .pagination {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 6px;
            padding-top: 48px;
        }

        .page-btn {
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            background: var(--bg-card);
            border: 1px solid var(--border);
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .page-btn:hover {
            border-color: var(--secondary);
            color: var(--secondary);
            background: rgba(0, 229, 255, 0.06);
        }

        .page-btn.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        .page-btn.disabled {
            opacity: 0.4;
            pointer-events: none;
        }

        /* Service Strip */
        .service-strip {
            background: var(--bg-dark);
            padding: var(--section-gap) 0;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

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

        .service-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            border: 1px solid var(--border);
            transition: all 0.35s ease;
        }

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

        .service-icon {
            font-size: 32px;
            color: var(--secondary);
            margin-bottom: 16px;
            display: block;
        }

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

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

        /* FAQ */
        .faq-section {
            padding: var(--section-gap) 0;
            background: var(--bg);
        }

        .section-head {
            text-align: center;
            margin-bottom: 42px;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.3;
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }

        .section-head p {
            font-size: 15px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .faq-item.expanded {
            border-color: var(--border-hover);
            box-shadow: 0 4px 20px rgba(0, 229, 255, 0.08);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            gap: 12px;
            transition: all 0.3s ease;
        }

        .faq-question::before {
            content: "";
            width: 4px;
            height: 24px;
            background: var(--primary);
            border-radius: 2px;
            flex-shrink: 0;
        }

        .faq-question span {
            flex: 1;
        }

        .faq-icon {
            font-size: 22px;
            color: var(--secondary);
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.3s ease;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 20px;
        }

        .faq-item.expanded .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px 24px;
        }

        .faq-answer p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
        }

        /* CTA */
        .cta-section {
            padding: var(--section-gap) 0;
            background: var(--bg-dark);
            border-top: 1px solid var(--border);
        }

        .cta-card {
            background: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, rgba(0, 229, 255, 0.06) 100%);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }

        .cta-text h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .cta-text p {
            font-size: 15px;
            color: var(--text-body);
            max-width: 520px;
            line-height: 1.7;
        }

        .btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            border: none;
        }

        .btn-primary:hover {
            background: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 45, 120, 0.3);
        }

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

        .btn-secondary {
            background: transparent;
            color: var(--secondary);
            border: 1px solid var(--secondary);
        }

        .btn-secondary:hover {
            background: rgba(0, 229, 255, 0.08);
            transform: translateY(-2px);
        }

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

        /* Footer */
        .site-footer {
            background: #07070D;
            padding-top: 56px;
            border-top: 1px solid rgba(124, 58, 237, 0.3);
        }

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

        .footer-brand .logo {
            font-size: 20px;
            margin-bottom: 16px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 260px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.03em;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

        .footer-bottom {
            padding: 20px 0 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            text-align: center;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-bottom p {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .footer-bottom a {
            font-size: 12px;
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

        .footer-sep {
            margin: 0 8px;
            color: var(--text-disabled);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr 1fr;
            }

            .news-item,
            .news-item.reverse {
                grid-template-columns: 1fr;
            }

            .news-image {
                min-height: 220px;
                max-height: 260px;
            }

            .news-item.reverse .news-image {
                order: 0;
            }

            .news-item.reverse .news-content {
                order: 0;
            }
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .page-hero {
                padding: 120px 0 36px;
            }

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

            .page-hero .lead {
                font-size: 15px;
            }

            .hero-stats {
                gap: 20px;
            }

            .hero-stat .num {
                font-size: 22px;
            }

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

            .cta-card {
                flex-direction: column;
                text-align: center;
                padding: 32px 24px;
            }

            .cta-text p {
                margin: 0 auto;
            }

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

            :root {
                --section-gap: 48px;
            }
        }

        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 26px;
            }

            .filter-pill {
                font-size: 12px;
                padding: 6px 14px;
            }

            .news-content {
                padding: 18px 16px;
            }

            .news-content h3 {
                font-size: 17px;
            }

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

            .pagination {
                gap: 4px;
            }

            .page-btn {
                width: 36px;
                height: 36px;
                font-size: 13px;
            }

            :root {
                --section-gap: 36px;
                --container-padding: 14px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #7C3AED;
            --primary-hover: #8B5CF6;
            --secondary: #00E5FF;
            --accent: #FF2D78;
            --bg: #0A0A12;
            --bg-secondary: #12121E;
            --bg-card: #16162A;
            --bg-dark: #0D0D18;
            --text-primary: #FFFFFF;
            --text-body: #B8B8CC;
            --text-secondary: #7A7A9A;
            --text-disabled: #4A4A62;
            --border: rgba(0, 229, 255, 0.15);
            --border-hover: rgba(0, 229, 255, 0.4);
            --success: #00CE7A;
            --warning: #FFB020;
            --error: #FF4D5A;
            --radius-card: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.25);
            --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
            --section-gap: 84px;
            --card-gap: 24px;
            --container-padding: 24px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 15px;
            letter-spacing: 0.01em;
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--container-padding);
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 10, 18, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(0, 229, 255, 0.12);
            transition: background 0.3s ease;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            letter-spacing: 0.02em;
            flex-shrink: 0;
        }

        .logo-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 12px var(--secondary);
            flex-shrink: 0;
        }

        .logo-text {
            background: linear-gradient(135deg, #FFFFFF 40%, #00E5FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

        .nav-desktop a {
            display: inline-block;
            padding: 10px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-primary);
            transition: all 0.3s ease;
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        .nav-desktop a:hover {
            color: var(--secondary);
            background: rgba(0, 229, 255, 0.06);
        }

        .nav-desktop a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            cursor: pointer;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }

        .nav-toggle:hover {
            background: rgba(0, 229, 255, 0.08);
            border-color: var(--secondary);
        }

        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 10, 18, 0.97);
            z-index: 999;
            flex-direction: column;
            padding: 100px 32px 40px;
            overflow-y: auto;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }

        .mobile-menu.open {
            display: flex;
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-menu a {
            display: block;
            padding: 16px 0;
            font-size: 24px;
            font-weight: 600;
            color: var(--text-primary);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            counter-increment: mobile-nav;
            transition: all 0.3s ease;
        }

        .mobile-menu a::before {
            content: "0" counter(mobile-nav);
            font-size: 14px;
            color: var(--secondary);
            margin-right: 12px;
            font-family: var(--font-mono);
        }

        .mobile-menu a:hover {
            color: var(--secondary);
            padding-left: 12px;
        }

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

        .mobile-menu-close {
            position: absolute;
            top: 24px;
            right: 24px;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            cursor: pointer;
            font-size: 20px;
            color: var(--text-primary);
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .mobile-menu-close:hover {
            border-color: var(--secondary);
            color: var(--secondary);
        }

        /* Breadcrumb */
        .breadcrumb-bar {
            padding: 100px 0 0;
            background: linear-gradient(180deg, rgba(124, 58, 237, 0.08) 0%, transparent 100%);
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-secondary);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--secondary);
            transition: color 0.3s ease;
        }

        .breadcrumb a:hover {
            color: var(--text-primary);
            text-decoration: underline;
        }

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

        .breadcrumb .current {
            color: var(--text-body);
        }

        /* Page Header */
        .page-header {
            padding: 40px 0 48px;
            position: relative;
        }

        .page-header::before {
            content: "";
            position: absolute;
            top: -20px;
            right: 0;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(124, 58, 237, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }

        .page-header h1 {
            font-size: 40px;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -0.5px;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .page-header h1 .highlight {
            color: var(--secondary);
        }

        .page-header .lead {
            font-size: 17px;
            color: var(--text-body);
            max-width: 720px;
            line-height: 1.8;
        }

        .page-header .header-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 20px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .page-header .header-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .page-header .header-meta .dot-sep {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--secondary);
            display: inline-block;
        }

        /* Stats Strip */
        .stats-strip {
            background: var(--bg-dark);
            border-top: 1px solid rgba(0, 229, 255, 0.1);
            border-bottom: 1px solid rgba(0, 229, 255, 0.1);
            padding: 32px 0;
        }

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

        .stat-item {
            text-align: center;
            padding: 16px 12px;
            border-right: 1px solid rgba(0, 229, 255, 0.1);
        }

        .stat-item:last-child {
            border-right: none;
        }

        .stat-item .stat-number {
            font-size: 40px;
            font-weight: 700;
            font-family: var(--font-mono);
            color: var(--secondary);
            line-height: 1.1;
            letter-spacing: -1px;
        }

        .stat-item .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 6px;
        }

        /* Review Grid Section */
        .review-grid-section {
            padding: var(--section-gap) 0;
        }

        .section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 32px;
            gap: 24px;
            flex-wrap: wrap;
        }

        .section-header h2 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            letter-spacing: -0.3px;
        }

        .section-header h2 .highlight {
            color: var(--secondary);
        }

        .section-header .section-desc {
            font-size: 15px;
            color: var(--text-body);
            max-width: 480px;
            line-height: 1.7;
        }

        .section-header .view-all {
            color: var(--secondary);
            font-size: 14px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all 0.3s ease;
        }

        .section-header .view-all:hover {
            color: var(--text-primary);
            text-decoration: underline;
        }

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

        .review-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid rgba(0, 229, 255, 0.12);
            overflow: hidden;
            transition: all 0.35s ease;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
        }

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

        .review-card .card-image {
            position: relative;
            aspect-ratio: 4/3;
            overflow: hidden;
        }

        .review-card .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .review-card:hover .card-image img {
            transform: scale(1.05);
        }

        .review-card .card-image .score-badge {
            position: absolute;
            top: 12px;
            right: 12px;
            background: rgba(10, 10, 18, 0.85);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(0, 229, 255, 0.3);
            border-radius: 999px;
            padding: 6px 14px;
            font-size: 16px;
            font-weight: 700;
            font-family: var(--font-mono);
            color: var(--secondary);
            letter-spacing: -0.5px;
        }

        .review-card .card-image .score-badge.high {
            color: var(--accent);
            border-color: rgba(255, 45, 120, 0.4);
        }

        .review-card .card-body {
            padding: 20px 20px 16px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .review-card .card-title {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            margin-bottom: 8px;
            transition: color 0.3s ease;
        }

        .review-card:hover .card-title {
            color: var(--secondary);
        }

        .review-card .card-excerpt {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .review-card .card-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 12px;
            color: var(--text-secondary);
            margin-top: auto;
            padding-top: 12px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .review-card .card-meta .tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 999px;
            border: 1px solid rgba(0, 229, 255, 0.25);
            color: var(--secondary);
            font-size: 11px;
            font-weight: 500;
        }

        .review-card .card-meta .date {
            margin-left: auto;
        }

        /* Pagination */
        .pagination {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-top: 40px;
            flex-wrap: wrap;
        }

        .pagination a,
        .pagination span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.3s ease;
        }

        .pagination a {
            color: var(--text-body);
            background: var(--bg-card);
        }

        .pagination a:hover {
            border-color: var(--secondary);
            color: var(--secondary);
        }

        .pagination span.current {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        .pagination .page-dots {
            border: none;
            background: transparent;
            color: var(--text-secondary);
        }

        /* Methodology Section */
        .methodology-section {
            padding: var(--section-gap) 0;
            background: var(--bg-dark);
            border-top: 1px solid rgba(0, 229, 255, 0.08);
            border-bottom: 1px solid rgba(0, 229, 255, 0.08);
        }

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

        .methodology-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid rgba(0, 229, 255, 0.1);
            transition: all 0.3s ease;
        }

        .methodology-card:hover {
            border-color: var(--border-hover);
        }

        .methodology-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .methodology-card h3 .icon {
            width: 32px;
            height: 32px;
            border-radius: var(--radius-sm);
            background: rgba(124, 58, 237, 0.2);
            border: 1px solid rgba(124, 58, 237, 0.3);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: var(--primary-hover);
            flex-shrink: 0;
        }

        .methodology-card p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
        }

        .methodology-card ul {
            list-style: none;
            margin-top: 12px;
        }

        .methodology-card ul li {
            font-size: 14px;
            color: var(--text-body);
            padding: 6px 0;
            padding-left: 20px;
            position: relative;
        }

        .methodology-card ul li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 13px;
            width: 8px;
            height: 8px;
            border-radius: 2px;
            background: var(--secondary);
            opacity: 0.7;
        }

        /* Testimonials */
        .testimonials-section {
            padding: var(--section-gap) 0;
        }

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

        .testimonial-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            padding: 24px;
            border: 1px solid rgba(0, 229, 255, 0.1);
            transition: all 0.3s ease;
        }

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

        .testimonial-card .quote-icon {
            font-size: 32px;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 12px;
        }

        .testimonial-card .testimonial-text {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .testimonial-card .testimonial-author {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .testimonial-card .avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(124, 58, 237, 0.3);
            border: 1px solid rgba(124, 58, 237, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-hover);
            flex-shrink: 0;
        }

        .testimonial-card .author-info .name {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .testimonial-card .author-info .role {
            font-size: 12px;
            color: var(--text-secondary);
        }

        /* Brand Intro */
        .brand-intro {
            padding: var(--section-gap) 0;
            background: linear-gradient(180deg, transparent 0%, rgba(124, 58, 237, 0.06) 50%, transparent 100%);
        }

        .brand-intro-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 48px;
            border: 1px solid rgba(0, 229, 255, 0.12);
            position: relative;
            overflow: hidden;
        }

        .brand-intro-card::before {
            content: "";
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .brand-intro-card h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .brand-intro-card p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.9;
            position: relative;
            z-index: 1;
        }

        .brand-intro-card .intro-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
            position: relative;
            z-index: 1;
        }

        .brand-intro-card .intro-tags .tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 999px;
            border: 1px solid rgba(0, 229, 255, 0.25);
            color: var(--secondary);
            font-size: 13px;
            font-weight: 500;
        }

        /* FAQ Section */
        .faq-section {
            padding: var(--section-gap) 0;
        }

        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid rgba(0, 229, 255, 0.12);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .faq-item:hover {
            border-color: rgba(0, 229, 255, 0.3);
        }

        .faq-item.active {
            border-color: var(--secondary);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.08);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            cursor: pointer;
            gap: 16px;
            user-select: none;
            transition: all 0.3s ease;
        }

        .faq-question .question-text {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .faq-question .question-text::before {
            content: "";
            width: 4px;
            height: 20px;
            border-radius: 2px;
            background: var(--primary);
            flex-shrink: 0;
        }

        .faq-item.active .faq-question .question-text::before {
            background: var(--secondary);
        }

        .faq-question .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: var(--secondary);
            flex-shrink: 0;
            transition: all 0.3s ease;
        }

        .faq-item.active .faq-question .faq-icon {
            transform: rotate(45deg);
            background: rgba(0, 229, 255, 0.15);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
        }

        .faq-item.active .faq-answer {
            max-height: 500px;
        }

        .faq-answer .answer-inner {
            padding: 0 20px 20px 36px;
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
        }

        /* CTA Section */
        .cta-section {
            padding: var(--section-gap) 0;
            background: linear-gradient(180deg, transparent 0%, rgba(124, 58, 237, 0.08) 50%, transparent 100%);
        }

        .cta-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 48px;
            text-align: center;
            border: 1px solid rgba(0, 229, 255, 0.15);
            position: relative;
            overflow: hidden;
        }

        .cta-card::before {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(124, 58, 237, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-card h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }

        .cta-card p {
            font-size: 16px;
            color: var(--text-body);
            max-width: 560px;
            margin: 0 auto 24px;
            line-height: 1.8;
            position: relative;
            z-index: 1;
        }

        .cta-card .cta-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            border: none;
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.3);
        }

        .btn-primary:hover {
            background: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 45, 120, 0.35);
        }

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

        .btn-secondary {
            background: transparent;
            color: var(--secondary);
            border: 1px solid var(--secondary);
        }

        .btn-secondary:hover {
            background: rgba(0, 229, 255, 0.08);
            transform: translateY(-2px);
        }

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

        /* Footer */
        .site-footer {
            background: #07070D;
            border-top: 1px solid rgba(124, 58, 237, 0.3);
            padding: 48px 0 24px;
            margin-top: 0;
        }

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

        .footer-brand .logo {
            font-size: 20px;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

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

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

        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            text-align: center;
            font-size: 12px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .footer-bottom a {
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

        .footer-sep {
            margin: 0 8px;
            color: var(--text-disabled);
        }

        /* Responsive */
        @media (max-width: 1023px) {
            .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .testimonials-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .methodology-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stat-item:nth-child(2) {
                border-right: none;
            }
        }

        @media (max-width: 767px) {
            :root {
                --section-gap: 48px;
                --container-padding: 18px;
            }
            .nav-desktop {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .page-header h1 {
                font-size: 28px;
            }
            .review-grid {
                grid-template-columns: 1fr;
            }
            .testimonials-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-item .stat-number {
                font-size: 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .brand-intro-card {
                padding: 28px 20px;
            }
            .cta-card {
                padding: 32px 20px;
            }
            .section-header {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 479px) {
            :root {
                --section-gap: 40px;
                --container-padding: 14px;
            }
            .page-header h1 {
                font-size: 24px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .cta-buttons {
                flex-direction: column;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-item {
                border-right: none;
                border-bottom: 1px solid rgba(0, 229, 255, 0.1);
                padding: 10px 6px;
            }
            .stat-item:nth-last-child(-n+2) {
                border-bottom: none;
            }
            .pagination a,
            .pagination span {
                min-width: 32px;
                height: 32px;
                font-size: 12px;
            }
        }

/* roulang page: category4 */
:root {
  --primary: #7C3AED;
  --primary-hover: #8B5CF6;
  --secondary: #00E5FF;
  --accent: #FF2D78;
  --bg: #0A0A12;
  --bg-secondary: #12121E;
  --bg-card: #16162A;
  --bg-dark: #0D0D18;
  --text-primary: #FFFFFF;
  --text-body: #B8B8CC;
  --text-secondary: #7A7A9A;
  --text-disabled: #4A4A62;
  --border: rgba(0, 229, 255, 0.15);
  --border-hover: rgba(0, 229, 255, 0.4);
  --success: #00CE7A;
  --warning: #FFB020;
  --error: #FF4D5A;
  --radius-card: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.25);
  --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
  --section-gap: 64px;
  --card-gap: 24px;
  --container-padding: 24px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-body);
  line-height: 1.7;
  font-size: 15px;
  min-height: 100vh;
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 229, 255, 0.12);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.logo-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--secondary);
  box-shadow: 0 0 12px var(--secondary);
  flex-shrink: 0;
}

.logo-text {
  background: linear-gradient(135deg, #FFFFFF 40%, #00E5FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-desktop a {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  transition: all 0.3s ease;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.nav-desktop a:hover {
  color: var(--secondary);
  background: rgba(0, 229, 255, 0.06);
}

.nav-desktop a.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.nav-toggle:hover {
  background: rgba(0, 229, 255, 0.08);
  border-color: var(--secondary);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 18, 0.98);
  z-index: 999;
  flex-direction: column;
  padding: 100px 32px 40px;
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu a {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all 0.3s ease;
}

.mobile-menu a:hover {
  color: var(--secondary);
  padding-left: 12px;
}

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

.mobile-menu a .menu-index {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-secondary);
  min-width: 24px;
}

/* Hero / Page Banner */
.page-banner {
  background-image: linear-gradient(135deg, rgba(124, 58, 237, 0.25) 0%, rgba(10, 10, 18, 0.1) 50%, rgba(0, 229, 255, 0.15) 100%), url('/assets/images/backpic/back-2.webp');
  background-size: cover;
  background-position: center;
  padding: 130px 0 70px;
  position: relative;
  border-bottom: 1px solid rgba(0, 229, 255, 0.1);
}

.page-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 40%, rgba(124, 58, 237, 0.2) 0%, transparent 55%),
    radial-gradient(ellipse at 70% 60%, rgba(0, 229, 255, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 22px;
  position: relative;
  z-index: 1;
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

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

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

.breadcrumb .current {
  color: var(--secondary);
}

.banner-inner {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.banner-inner h1 {
  font-size: 42px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.banner-inner h1 .highlight {
  color: var(--secondary);
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
}

.banner-inner p {
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.7;
  max-width: 680px;
}

/* Main Layout */
.main-area {
  padding: 60px 0 80px;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 32px;
  align-items: start;
}

/* Article List */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-item {
  display: flex;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 18px;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.article-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity 0.35s ease;
}

.article-item:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.article-item:hover::before {
  opacity: 1;
}

.article-thumb {
  flex-shrink: 0;
  width: 180px;
  height: 120px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

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

.article-item:hover .article-thumb img {
  transform: scale(1.05);
}

.article-thumb .download-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.article-content {
  flex: 1;
  min-width: 0;
}

.article-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  transition: color 0.3s ease;
}

.article-item:hover .article-content h3 {
  color: var(--secondary);
}

.article-content .desc {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.65;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  font-size: 12px;
  color: var(--secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 12px;
  white-space: nowrap;
  transition: all 0.3s ease;
}

.tag:hover {
  border-color: var(--secondary);
  background: rgba(0, 229, 255, 0.06);
}

.article-meta .date {
  font-size: 12px;
  color: var(--text-secondary);
}

.article-meta .size {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 3px 10px;
  border-radius: 4px;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 22px;
}

.sidebar-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 3px solid var(--primary);
  line-height: 1.3;
}

.search-box {
  display: flex;
  gap: 8px;
}

.search-box input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.search-box input:focus {
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.1);
}

.search-box button {
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.search-box button:hover {
  background: var(--accent);
  box-shadow: 0 4px 16px rgba(255, 45, 120, 0.35);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-cloud .tag {
  font-size: 13px;
  padding: 5px 14px;
}

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

.reco-item {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all 0.3s ease;
}

.reco-item:last-child {
  border-bottom: none;
}

.reco-item:hover {
  padding-left: 6px;
}

.reco-item img {
  width: 60px;
  height: 44px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
}

.reco-item .reco-info {
  min-width: 0;
}

.reco-item .reco-info h5 {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.3s ease;
}

.reco-item:hover .reco-info h5 {
  color: var(--secondary);
}

.reco-item .reco-info span {
  font-size: 11px;
  color: var(--text-secondary);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border);
  color: var(--text-body);
  transition: all 0.3s ease;
}

.pagination a:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  background: rgba(0, 229, 255, 0.06);
}

.pagination .current {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
}

.pagination .disabled {
  color: var(--text-disabled);
  pointer-events: none;
  border-color: rgba(255, 255, 255, 0.05);
}

/* Bottom CTA */
.cta-section {
  padding: 64px 0 72px;
  background: var(--bg-dark);
  border-top: 1px solid rgba(124, 58, 237, 0.2);
}

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

.cta-inner h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.3;
}

.cta-inner p {
  font-size: 15px;
  color: var(--text-body);
  max-width: 560px;
}

.cta-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 12px 28px;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.3s ease;
  text-align: center;
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 45, 120, 0.35);
}

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--secondary);
  border: 1px solid var(--secondary);
  border-radius: var(--radius-sm);
  padding: 12px 28px;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.3s ease;
  text-align: center;
  white-space: nowrap;
}

.btn-outline:hover {
  background: rgba(0, 229, 255, 0.08);
  transform: translateY(-2px);
}

/* Footer */
.site-footer {
  background: #07070D;
  border-top: 1px solid rgba(124, 58, 237, 0.3);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}

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

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

.footer-col ul li a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.footer-bottom a {
  font-size: 12px;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

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

.footer-sep {
  margin: 0 8px;
  color: var(--text-disabled);
}

/* Responsive */
@media (max-width: 1024px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: static;
    order: 2;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .mobile-menu {
    display: flex;
  }
  .page-banner {
    padding: 110px 0 50px;
  }
  .banner-inner h1 {
    font-size: 30px;
  }
  .article-item {
    flex-direction: column;
  }
  .article-thumb {
    width: 100%;
    height: 170px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .cta-inner {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .cta-buttons {
    flex-direction: column;
  }
  .btn-primary,
  .btn-outline {
    width: 100%;
  }
}

@media (max-width: 520px) {
  :root {
    --section-gap: 40px;
    --container-padding: 14px;
  }
  .banner-inner h1 {
    font-size: 25px;
  }
  .banner-inner p {
    font-size: 14px;
  }
  .article-content h3 {
    font-size: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .footer-brand {
    grid-column: auto;
  }
  .pagination a,
  .pagination span {
    min-width: 34px;
    height: 34px;
    font-size: 12px;
    padding: 0 8px;
  }
  .search-box {
    flex-direction: column;
  }
  .search-box button {
    width: 100%;
  }
}

/* roulang page: category3 */
:root {
  --primary: #7C3AED;
  --primary-hover: #8B5CF6;
  --secondary: #00E5FF;
  --accent: #FF2D78;
  --bg: #0A0A12;
  --bg-secondary: #12121E;
  --bg-card: #16162A;
  --bg-dark: #0D0D18;
  --text-primary: #FFFFFF;
  --text-body: #B8B8CC;
  --text-secondary: #7A7A9A;
  --text-disabled: #4A4A62;
  --border: rgba(0, 229, 255, 0.15);
  --border-hover: rgba(0, 229, 255, 0.4);
  --success: #00CE7A;
  --warning: #FFB020;
  --error: #FF4D5A;
  --radius-card: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.25);
  --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
  --section-gap: 72px;
  --card-gap: 24px;
  --container-padding: 24px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-body);
  line-height: 1.7;
  font-size: 15px;
  letter-spacing: 0.01em;
  min-height: 100vh;
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 229, 255, 0.12);
  transition: background 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.logo-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--secondary);
  box-shadow: 0 0 12px var(--secondary);
  flex-shrink: 0;
}

.logo-text {
  background: linear-gradient(135deg, #FFFFFF 40%, #00E5FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-desktop a {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  transition: all 0.3s ease;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.nav-desktop a:hover {
  color: var(--secondary);
  background: rgba(0, 229, 255, 0.06);
}

.nav-desktop a.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: all 0.3s ease;
  flex-shrink: 0;
  z-index: 1002;
}

.nav-toggle:hover {
  background: rgba(0, 229, 255, 0.08);
  border-color: var(--secondary);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 18, 0.98);
  z-index: 1001;
  flex-direction: column;
  padding: 100px 32px 40px;
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu a {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: all 0.3s ease;
  letter-spacing: 0.03em;
}

.mobile-menu a:hover {
  color: var(--secondary);
  padding-left: 12px;
}

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

/* Breadcrumb */
.breadcrumb-wrap {
  background: var(--bg-dark);
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
  padding: 14px 0;
  margin-top: 65px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

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

.breadcrumb .sep {
  color: var(--text-disabled);
  font-size: 11px;
}

.breadcrumb .current {
  color: var(--secondary);
}

/* Page header */
.page-header {
  padding: 48px 0 40px;
  position: relative;
  background: radial-gradient(ellipse at 30% 20%, rgba(124, 58, 237, 0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(0, 229, 255, 0.06) 0%, transparent 50%);
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
}

.page-header-inner {
  max-width: 860px;
}

.page-header h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.page-header h1 .highlight {
  color: var(--secondary);
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
}

.page-header .lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-body);
  max-width: 720px;
}

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

.page-header .header-stat {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.page-header .header-stat .num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--secondary);
}

/* Featured article */
.featured-section {
  padding: 40px 0 0;
}

.featured-card {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  min-height: 360px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: all 0.4s ease;
}

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

.featured-card .featured-img {
  position: relative;
  overflow: hidden;
  min-height: 300px;
}

.featured-card .featured-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

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

.featured-card .featured-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 40%, rgba(10,10,18,0.7) 100%);
}

.featured-card .featured-badge {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 3;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 16px rgba(255, 45, 120, 0.35);
}

.featured-card .featured-content {
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
}

.featured-card .featured-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  width: fit-content;
}

.featured-card .featured-title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  transition: color 0.3s ease;
}

.featured-card:hover .featured-title {
  color: var(--secondary);
}

.featured-card .featured-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
}

.featured-card .featured-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 6px;
  flex-wrap: wrap;
}

.featured-card .featured-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.featured-card .featured-meta .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--secondary);
}

.featured-card .featured-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--secondary);
  font-size: 14px;
  font-weight: 600;
  margin-top: 8px;
  transition: all 0.3s ease;
  width: fit-content;
}

.featured-card .featured-cta:hover {
  text-decoration: underline;
  color: #fff;
}

/* Interleaved grid */
.interleaved-section {
  padding: 48px 0 72px;
}

.interleaved-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px 36px;
  margin-top: 28px;
}

.interleaved-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all 0.4s ease;
}

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

.interleaved-card .card-img-wrap {
  position: relative;
  overflow: hidden;
}

.interleaved-card .card-img-wrap img {
  width: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.interleaved-card:hover .card-img-wrap img {
  transform: scale(1.05);
}

.interleaved-card:nth-child(odd) .card-img-wrap {
  aspect-ratio: 16 / 9;
}

.interleaved-card:nth-child(even) .card-img-wrap {
  aspect-ratio: 4 / 3;
}

.interleaved-card .card-img-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10,10,18,0.75) 100%);
  pointer-events: none;
}

.interleaved-card .card-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 3;
  background: rgba(22, 22, 42, 0.85);
  color: var(--secondary);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.interleaved-card .card-body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.interleaved-card .card-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text-primary);
  letter-spacing: -0.2px;
  transition: color 0.3s ease;
}

.interleaved-card:hover .card-title {
  color: var(--secondary);
}

.interleaved-card .card-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-body);
  flex: 1;
}

.interleaved-card .card-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--text-secondary);
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  flex-wrap: wrap;
}

.interleaved-card .card-meta .meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.interleaved-card .card-meta .meta-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary);
}

.interleaved-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--secondary);
  font-size: 13px;
  font-weight: 600;
  margin-top: 4px;
  transition: all 0.3s ease;
  width: fit-content;
}

.interleaved-card .card-link:hover {
  color: #fff;
  text-decoration: underline;
}

/* Offsetting interleaved cards for magazine style */
.interleaved-grid .interleaved-card:nth-child(even) {
  margin-top: 36px;
}

.interleaved-grid .interleaved-card:nth-child(odd) {
  margin-bottom: 0;
}

/* Topic tag bar */
.topic-bar {
  padding: 18px 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.topic-bar .topic-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.topic-bar .topic-label::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}

.topic-bar .topic-chip {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-body);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.topic-bar .topic-chip:hover {
  color: var(--secondary);
  border-color: var(--border-hover);
  background: rgba(0, 229, 255, 0.06);
}

.topic-bar .topic-chip.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.3);
}

/* Pagination */
.pagination-section {
  padding: 32px 0 56px;
  display: flex;
  justify-content: center;
}

.pagination {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-body);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: var(--bg-card);
  transition: all 0.3s ease;
}

.pagination a:hover {
  color: var(--secondary);
  border-color: var(--border-hover);
  background: rgba(0, 229, 255, 0.06);
}

.pagination .current {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
}

.pagination .page-info {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 0 4px;
}

/* CTA section */
.cta-section {
  padding: 48px 0 72px;
  background: radial-gradient(ellipse at center 30%, rgba(124, 58, 237, 0.15) 0%, transparent 70%);
  border-top: 1px solid rgba(0, 229, 255, 0.08);
}

.cta-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -20%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.cta-box .cta-text {
  flex: 1;
  min-width: 260px;
}

.cta-box .cta-text h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.3px;
}

.cta-box .cta-text p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.75;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 45, 120, 0.35);
}

.btn-secondary {
  background: transparent;
  color: var(--secondary);
  border: 1px solid var(--secondary);
}

.btn-secondary:hover {
  background: rgba(0, 229, 255, 0.08);
  transform: translateY(-2px);
}

/* Section headings */
.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Footer */
.site-footer {
  background: #07070D;
  border-top: 1px solid rgba(124, 58, 237, 0.25);
  padding: 56px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-top: 16px;
  max-width: 280px;
}

.footer-brand .logo {
  margin-bottom: 8px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
  text-align: center;
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-bottom a {
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

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

.footer-sep {
  margin: 0 8px;
  color: var(--text-disabled);
}

/* Responsive */
@media (max-width: 1024px) {
  .featured-card {
    grid-template-columns: 1fr;
  }
  .featured-card .featured-img {
    min-height: 240px;
  }
  .featured-card .featured-img::after {
    background: linear-gradient(180deg, transparent 40%, rgba(10,10,18,0.8) 100%);
  }
  .featured-card .featured-content {
    padding: 28px 24px 32px;
  }
  .interleaved-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .interleaved-grid .interleaved-card:nth-child(even) {
    margin-top: 0;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  .page-header h1 {
    font-size: 32px;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .mobile-menu {
    display: flex;
  }
  .nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  :root {
    --section-gap: 48px;
    --container-padding: 18px;
  }
  .page-header {
    padding: 32px 0 28px;
  }
  .page-header h1 {
    font-size: 26px;
  }
  .page-header .header-stats {
    gap: 16px;
  }
  .featured-card .featured-title {
    font-size: 20px;
  }
  .section-heading h2 {
    font-size: 22px;
  }
  .cta-box {
    padding: 32px 24px;
    flex-direction: column;
    text-align: center;
  }
  .cta-box .cta-actions {
    justify-content: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-brand p {
    max-width: 100%;
  }
  .breadcrumb-wrap {
    margin-top: 60px;
  }
}

@media (max-width: 520px) {
  :root {
    --section-gap: 40px;
    --container-padding: 14px;
  }
  .page-header h1 {
    font-size: 22px;
  }
  .page-header .lead {
    font-size: 14px;
  }
  .featured-card .featured-content {
    padding: 20px 18px 24px;
  }
  .featured-card .featured-title {
    font-size: 18px;
  }
  .interleaved-card .card-body {
    padding: 16px 18px 20px;
  }
  .interleaved-card .card-title {
    font-size: 16px;
  }
  .topic-bar {
    gap: 6px;
  }
  .topic-bar .topic-chip {
    font-size: 12px;
    padding: 5px 12px;
  }
  .pagination a,
  .pagination span {
    min-width: 34px;
    height: 34px;
    padding: 0 10px;
    font-size: 13px;
  }
  .btn {
    padding: 11px 22px;
    font-size: 14px;
    width: 100%;
    justify-content: center;
  }
  .cta-box .cta-text h2 {
    font-size: 20px;
  }
}

/* Focus states for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

.btn:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 3px;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 3px;
}

/* roulang page: category5 */
:root {
            --primary: #7C3AED;
            --primary-hover: #8B5CF6;
            --secondary: #00E5FF;
            --accent: #FF2D78;
            --bg: #0A0A12;
            --bg-secondary: #12121E;
            --bg-card: #16162A;
            --bg-dark: #0D0D18;
            --text-primary: #FFFFFF;
            --text-body: #B8B8CC;
            --text-secondary: #7A7A9A;
            --text-disabled: #4A4A62;
            --border: rgba(0, 229, 255, 0.15);
            --border-hover: rgba(0, 229, 255, 0.4);
            --success: #00CE7A;
            --warning: #FFB020;
            --error: #FF4D5A;
            --radius-card: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.25);
            --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
            --section-gap: 72px;
            --card-gap: 24px;
            --container-padding: 24px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 15px;
            letter-spacing: 0.01em;
            min-height: 100vh;
            overflow-x: hidden;
            margin: 0;
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--container-padding);
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 10, 18, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(0, 229, 255, 0.12);
            transition: background 0.3s ease;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            letter-spacing: 0.02em;
            flex-shrink: 0;
        }

        .logo-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 12px var(--secondary);
            flex-shrink: 0;
        }

        .logo-text {
            background: linear-gradient(135deg, #FFFFFF 40%, #00E5FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

        .nav-desktop a {
            display: inline-block;
            padding: 10px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-primary);
            transition: all 0.3s ease;
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        .nav-desktop a:hover {
            color: var(--secondary);
            background: rgba(0, 229, 255, 0.06);
        }

        .nav-desktop a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            cursor: pointer;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }

        .nav-toggle:hover {
            background: rgba(0, 229, 255, 0.08);
            border-color: var(--secondary);
        }

        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 10, 18, 0.98);
            z-index: 999;
            flex-direction: column;
            padding: 100px 32px 40px;
            overflow-y: auto;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }

        .mobile-menu.open {
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-menu a {
            display: block;
            padding: 18px 0;
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: all 0.3s ease;
            letter-spacing: 0.02em;
        }

        .mobile-menu a:hover {
            color: var(--secondary);
            padding-left: 12px;
        }

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

        /* Breadcrumb */
        .breadcrumb {
            padding: 100px 0 0;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .breadcrumb ol {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
        }

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

        .breadcrumb li::after {
            content: "/";
            color: var(--text-disabled);
        }

        .breadcrumb li:last-child::after {
            display: none;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

        .breadcrumb li:last-child {
            color: var(--secondary);
        }

        /* Page Header */
        .page-header {
            padding: 28px 0 20px;
        }

        .page-header h1 {
            font-size: 40px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
            letter-spacing: -0.5px;
            margin: 0 0 14px;
        }

        .page-header h1 .highlight {
            color: var(--secondary);
            text-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
        }

        .page-header .subtitle {
            font-size: 16px;
            color: var(--text-body);
            max-width: 720px;
            line-height: 1.8;
            margin: 0;
        }

        /* Hero Banner */
        .hero-banner {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin: 20px 0 0;
            min-height: 320px;
            display: flex;
            align-items: flex-end;
            border: 1px solid rgba(0, 229, 255, 0.15);
        }

        .hero-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 10, 18, 0.1) 0%, rgba(10, 10, 18, 0.75) 60%, rgba(10, 10, 18, 0.92) 100%);
            z-index: 1;
        }

        .hero-banner img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 0;
        }

        .hero-banner-content {
            position: relative;
            z-index: 2;
            padding: 32px 36px;
            max-width: 680px;
        }

        .hero-banner-content .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 500;
            color: var(--secondary);
            border: 1px solid var(--secondary);
            background: rgba(0, 229, 255, 0.08);
            margin-bottom: 12px;
            letter-spacing: 0.04em;
        }

        .hero-banner-content h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 10px;
            line-height: 1.35;
        }

        .hero-banner-content p {
            font-size: 14px;
            color: var(--text-body);
            margin: 0;
            line-height: 1.75;
        }

        /* Section titles */
        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 20px;
            margin-bottom: 28px;
            flex-wrap: wrap;
        }

        .section-head h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
            line-height: 1.3;
            letter-spacing: -0.02em;
        }

        .section-head p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
            max-width: 400px;
            line-height: 1.6;
        }

        /* Deep Reading List */
        .deep-reading-list {
            padding: 40px 0 0;
        }

        .article-item {
            display: flex;
            gap: 24px;
            padding: 28px 0;
            border-bottom: 1px solid rgba(0, 229, 255, 0.08);
            transition: all 0.3s ease;
            position: relative;
        }

        .article-item:hover {
            border-bottom-color: var(--border-hover);
        }

        .article-item .article-index {
            font-family: var(--font-mono);
            font-size: 32px;
            font-weight: 700;
            color: rgba(255, 255, 255, 0.08);
            flex-shrink: 0;
            width: 64px;
            line-height: 1.2;
            letter-spacing: -0.03em;
        }

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

        .article-item .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 14px;
            font-size: 12px;
            color: var(--text-secondary);
            margin-bottom: 10px;
        }

        .article-item .article-meta .category-tag {
            padding: 2px 10px;
            border-radius: 999px;
            font-size: 11px;
            font-weight: 500;
            color: var(--secondary);
            border: 1px solid rgba(0, 229, 255, 0.3);
            background: rgba(0, 229, 255, 0.06);
            letter-spacing: 0.03em;
        }

        .article-item .article-meta .read-time {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .article-item .article-meta .read-time::before {
            content: "⏱";
            font-size: 12px;
            color: var(--text-disabled);
        }

        .article-item h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 10px;
            line-height: 1.4;
            transition: color 0.3s ease;
        }

        .article-item:hover h3 {
            color: var(--secondary);
        }

        .article-item h3 a {
            color: inherit;
            text-decoration: none;
        }

        .article-item .article-excerpt {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
            margin: 0 0 12px;
            display: -webkit-box;
            -webkit-line-clamp: 5;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-item .read-more-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--secondary);
            letter-spacing: 0.03em;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .article-item .read-more-link:hover {
            color: var(--text-primary);
            gap: 8px;
        }

        .article-item .read-more-link::after {
            content: "→";
            font-size: 14px;
        }

        /* Pagination */
        .pagination {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 32px 0 8px;
            flex-wrap: wrap;
        }

        .pagination a,
        .pagination span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 40px;
            height: 40px;
            padding: 0 14px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            transition: all 0.3s ease;
            border: 1px solid transparent;
        }

        .pagination a {
            color: var(--text-body);
            background: var(--bg-card);
            border-color: rgba(255, 255, 255, 0.06);
        }

        .pagination a:hover {
            color: var(--secondary);
            border-color: var(--secondary);
            background: rgba(0, 229, 255, 0.06);
        }

        .pagination .current {
            color: #fff;
            background: var(--primary);
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
        }

        .pagination .prev-next {
            padding: 0 18px;
        }

        /* Editor's Pick */
        .editors-pick {
            padding: 40px 0 0;
        }

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

        .pick-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }

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

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

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

        .pick-card:hover .pick-image img {
            transform: scale(1.05);
        }

        .pick-card .pick-image .pick-badge {
            position: absolute;
            top: 12px;
            right: 12px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: 11px;
            font-weight: 600;
            color: #fff;
            background: var(--accent);
            letter-spacing: 0.04em;
        }

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

        .pick-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 8px;
            line-height: 1.4;
            transition: color 0.3s ease;
        }

        .pick-card:hover h3 {
            color: var(--secondary);
        }

        .pick-card p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0 0 12px;
            line-height: 1.7;
            flex: 1;
        }

        .pick-card .pick-meta {
            font-size: 11px;
            color: var(--text-disabled);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* Stats Strip */
        .stats-strip {
            background: var(--bg-dark);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(0, 229, 255, 0.1);
            padding: 32px 36px;
            margin: 40px 0 0;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .stat-item {
            text-align: center;
            padding: 0 16px;
            position: relative;
        }

        .stat-item:not(:last-child)::after {
            content: "";
            position: absolute;
            right: -10px;
            top: 50%;
            transform: translateY(-50%);
            width: 1px;
            height: 40px;
            background: rgba(0, 229, 255, 0.15);
        }

        .stat-item .stat-number {
            font-family: var(--font-mono);
            font-size: 36px;
            font-weight: 700;
            color: var(--secondary);
            line-height: 1.2;
            letter-spacing: -0.02em;
            text-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
        }

        .stat-item .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 4px;
            letter-spacing: 0.03em;
        }

        /* CTA Section */
        .cta-section {
            background: var(--bg-secondary);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(124, 58, 237, 0.2);
            padding: 44px 40px;
            margin: 40px 0 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            top: -60px;
            left: 50%;
            transform: translateX(-50%);
            width: 300px;
            height: 200px;
            background: radial-gradient(ellipse, rgba(124, 58, 237, 0.25), transparent 70%);
            pointer-events: none;
        }

        .cta-section h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 12px;
            position: relative;
            z-index: 1;
        }

        .cta-section p {
            font-size: 15px;
            color: var(--text-body);
            max-width: 520px;
            margin: 0 auto 24px;
            line-height: 1.8;
            position: relative;
            z-index: 1;
        }

        .cta-buttons {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            background: var(--primary);
            cursor: pointer;
            transition: all 0.3s ease;
            letter-spacing: 0.02em;
            border: none;
        }

        .btn-primary:hover {
            background: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 45, 120, 0.35);
        }

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

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            color: var(--secondary);
            background: transparent;
            border: 1px solid var(--secondary);
            cursor: pointer;
            transition: all 0.3s ease;
            letter-spacing: 0.02em;
        }

        .btn-secondary:hover {
            background: rgba(0, 229, 255, 0.08);
            transform: translateY(-2px);
        }

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

        /* Footer */
        .site-footer {
            background: #07070D;
            border-top: 1px solid rgba(124, 58, 237, 0.25);
            padding: 56px 0 28px;
            margin-top: 64px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }

        .footer-brand .logo {
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin: 0;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 14px;
            letter-spacing: 0.03em;
        }

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

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

        .footer-col a {
            font-size: 13px;
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 12px;
            color: var(--text-disabled);
            margin: 4px 0;
        }

        .footer-bottom a {
            font-size: 12px;
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

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

        .footer-sep {
            margin: 0 8px;
            color: var(--text-disabled);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --section-gap: 56px;
            }

            .page-header h1 {
                font-size: 34px;
            }

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

            .stats-strip {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

            .stat-item:nth-child(2)::after {
                display: none;
            }

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

            .footer-brand {
                grid-column: span 3;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
                --container-padding: 18px;
            }

            .nav-desktop {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .mobile-menu {
                display: flex;
            }

            .page-header h1 {
                font-size: 28px;
            }

            .hero-banner {
                min-height: 240px;
            }

            .hero-banner-content {
                padding: 24px 20px;
            }

            .hero-banner-content h2 {
                font-size: 20px;
            }

            .article-item {
                flex-direction: column;
                gap: 10px;
                padding: 20px 0;
            }

            .article-item .article-index {
                font-size: 24px;
                width: auto;
            }

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

            .stats-strip {
                grid-template-columns: repeat(2, 1fr);
                padding: 24px 20px;
            }

            .cta-section {
                padding: 32px 20px;
            }

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

            .footer-brand {
                grid-column: span 2;
            }
        }

        @media (max-width: 520px) {
            :root {
                --section-gap: 40px;
                --container-padding: 14px;
            }

            .page-header h1 {
                font-size: 24px;
            }

            .hero-banner {
                min-height: 200px;
            }

            .hero-banner-content {
                padding: 18px 16px;
            }

            .hero-banner-content h2 {
                font-size: 18px;
            }

            .stats-strip {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }

            .stat-item .stat-number {
                font-size: 28px;
            }

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

            .footer-brand {
                grid-column: span 1;
            }

            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
            }

            .pagination a,
            .pagination span {
                min-width: 34px;
                height: 34px;
                padding: 0 10px;
                font-size: 12px;
            }
        }