/* roulang page: index */
:root {
            --primary: #1D6FDC;
            --primary-hover: #2563EB;
            --cyan: #22D3EE;
            --cyan-glow: rgba(34, 211, 238, 0.45);
            --gold: #F5B942;
            --gold-light: #FBBF24;
            --violet: #7C3AED;
            --bg: #F5F7FB;
            --bg-alt: #EEF3F9;
            --card: #FFFFFF;
            --border: #E2E8F0;
            --text-dark: #0F172A;
            --text-mid: #475569;
            --text-light: #64748B;
            --nav-bg: #0B1220;
            --radius-card: 18px;
            --radius-btn: 12px;
            --shadow-card: 0 8px 24px rgba(29, 111, 220, 0.08);
            --shadow-hover: 0 14px 36px rgba(29, 111, 220, 0.14);
            --transition: all 0.25s ease;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
        }

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

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

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-dark);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            cursor: pointer;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--cyan-glow);
            outline-offset: 2px;
            border-radius: 6px;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            background: var(--nav-bg);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
            border-bottom: 2px solid var(--cyan);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            box-shadow: 0 0 18px rgba(34, 211, 238, 0.4);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

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

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }

        .nav-menu a {
            color: #cbd5e1;
            font-size: 15px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-menu a:hover {
            color: #fff;
            background: rgba(34, 211, 238, 0.08);
        }

        .nav-menu a.active {
            color: var(--cyan);
            text-shadow: 0 0 12px var(--cyan-glow);
        }

        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px var(--cyan-glow);
        }

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

        .btn-nav-cta {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
            display: inline-block;
            white-space: nowrap;
        }

        .btn-nav-cta:hover {
            box-shadow: 0 0 32px rgba(34, 211, 238, 0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .hamburger {
            display: none;
            background: transparent;
            color: #fff;
            font-size: 24px;
            padding: 6px 10px;
            border-radius: 8px;
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .mobile-menu {
            display: none;
            background: var(--nav-bg);
            padding: 0 24px 24px;
            border-top: 1px solid rgba(34, 211, 238, 0.2);
        }

        .mobile-menu a {
            display: block;
            color: #cbd5e1;
            padding: 12px 8px;
            font-size: 16px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 6px;
        }

        .mobile-menu a:hover {
            color: var(--cyan);
            background: rgba(34, 211, 238, 0.08);
        }

        .mobile-menu a.active {
            color: var(--cyan);
            font-weight: 600;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--cyan));
            color: #fff;
            box-shadow: 0 4px 16px rgba(29, 111, 220, 0.28);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(34, 211, 238, 0.4);
        }

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

        .btn-outline:hover {
            background: #EFF6FF;
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(29, 111, 220, 0.12);
        }

        .btn-gold {
            background: var(--gold);
            color: #0F172A;
            box-shadow: 0 4px 16px rgba(245, 185, 66, 0.35);
            font-weight: 700;
        }

        .btn-gold:hover {
            background: var(--gold-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245, 185, 66, 0.5);
        }

        /* ===== Sections ===== */
        section {
            padding: 72px 0;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 12px;
        }

        .section-label .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--cyan);
            box-shadow: 0 0 8px var(--cyan-glow);
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 14px;
            line-height: 1.35;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-mid);
            max-width: 680px;
            line-height: 1.75;
            margin-bottom: 32px;
        }

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

        /* ===== Hero ===== */
        .hero {
            background: linear-gradient(rgba(11, 18, 32, 0.82), rgba(11, 18, 32, 0.88)), url('/assets/images/da777b7119befab7.webp') center/cover no-repeat;
            color: #fff;
            padding: 96px 0 80px;
            position: relative;
            overflow: hidden;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--cyan), var(--primary), var(--gold), var(--violet));
            opacity: 0.7;
        }

        .hero h1 {
            font-size: 42px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }

        .hero h1 .highlight {
            color: var(--cyan);
            text-shadow: 0 0 24px var(--cyan-glow);
        }

        .hero-subtitle {
            font-size: 16px;
            color: #cbd5e1;
            max-width: 720px;
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 40px;
        }

        .hero-metrics {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 16px;
            padding: 20px 24px;
            backdrop-filter: blur(12px);
        }

        .hero-metric-item {
            text-align: center;
        }

        .hero-metric-number {
            font-size: 28px;
            font-weight: 700;
            color: var(--gold-light);
            line-height: 1.3;
        }

        .hero-metric-label {
            font-size: 13px;
            color: #94a3b8;
            margin-top: 2px;
        }

        /* ===== Brand Intro ===== */
        .brand-intro-card {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 36px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
        }

        .brand-intro-text h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-dark);
        }

        .brand-intro-text p {
            color: var(--text-mid);
            line-height: 1.8;
            margin-bottom: 12px;
        }

        .brand-intro-image {
            border-radius: 14px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .brand-intro-image img {
            width: 100%;
            height: 220px;
            object-fit: cover;
        }

        /* ===== Content Calendar ===== */
        .calendar-grid {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 8px;
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 20px;
        }

        .calendar-day {
            text-align: center;
            padding: 12px 6px;
            border-radius: 10px;
            background: var(--bg);
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .calendar-day:hover {
            border-color: var(--cyan);
            box-shadow: 0 0 12px var(--cyan-glow);
            transform: translateY(-2px);
        }

        .calendar-day-name {
            font-size: 12px;
            color: var(--text-light);
            margin-bottom: 4px;
        }

        .calendar-day-topic {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-dark);
        }

        .calendar-day.highlight {
            background: linear-gradient(135deg, #EFF6FF, #E0F7FF);
            border-color: var(--cyan);
        }

        /* ===== Cards / Grid ===== */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .cards-grid.four-col {
            grid-template-columns: repeat(4, 1fr);
        }

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

        .info-card {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 26px;
            transition: var(--transition);
        }

        .info-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: #cbd5e1;
        }

        .info-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 14px;
            background: linear-gradient(135deg, #EFF6FF, #E0F7FF);
            color: var(--primary);
        }

        .info-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

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

        .info-card .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
            background: #EFF6FF;
            color: var(--primary);
        }

        .info-card .tag.gold {
            background: #FFFBEB;
            color: #B45309;
        }

        /* ===== Article List ===== */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .article-item {
            display: flex;
            gap: 18px;
            background: var(--card);
            border-radius: 14px;
            border: 1px solid var(--border);
            padding: 18px;
            transition: var(--transition);
            align-items: center;
        }

        .article-item:hover {
            box-shadow: var(--shadow-card);
            transform: translateX(4px);
            border-color: #cbd5e1;
        }

        .article-thumb {
            flex-shrink: 0;
            width: 120px;
            height: 80px;
            border-radius: 10px;
            overflow: hidden;
        }

        .article-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .article-info {
            flex: 1;
        }

        .article-info h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 4px;
            line-height: 1.5;
        }

        .article-meta {
            font-size: 12px;
            color: var(--text-light);
            display: flex;
            gap: 14px;
        }

        /* ===== Data Analysis ===== */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .data-card {
            background: var(--card);
            border-radius: 14px;
            border: 1px solid var(--border);
            padding: 22px;
            text-align: center;
            transition: var(--transition);
        }

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

        .data-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.25;
        }

        .data-number.gold-num {
            color: var(--gold);
        }

        .data-number.cyan-num {
            color: var(--cyan);
        }

        .data-label {
            font-size: 14px;
            color: var(--text-light);
            margin-top: 4px;
        }

        /* ===== Guarantee ===== */
        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
        }

        .guarantee-item {
            background: var(--card);
            border-radius: 14px;
            border: 1px solid var(--border);
            padding: 20px;
            text-align: center;
            transition: var(--transition);
        }

        .guarantee-item:hover {
            box-shadow: var(--shadow-card);
            border-color: var(--cyan);
        }

        .guarantee-icon {
            font-size: 28px;
            color: var(--gold);
            margin-bottom: 8px;
        }

        .guarantee-item h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-dark);
        }

        /* ===== Partner Wall ===== */
        .partner-wall {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }

        .partner-badge {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 12px 22px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-mid);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .partner-badge:hover {
            border-color: var(--cyan);
            color: var(--primary);
            box-shadow: 0 0 16px rgba(34, 211, 238, 0.2);
        }

        .partner-badge i {
            color: var(--gold);
        }

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

        .faq-item {
            background: var(--card);
            border-radius: 14px;
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: #cbd5e1;
        }

        .faq-question {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 15px;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            user-select: none;
        }

        .faq-question i {
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--cyan);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--text-mid);
            font-size: 14px;
            line-height: 1.75;
            padding: 0 22px;
        }

        .faq-item.open .faq-answer {
            max-height: 500px;
            padding: 0 22px 20px;
        }

        /* ===== Subscribe ===== */
        .subscribe-box {
            background: linear-gradient(135deg, #0B1220, #1E293B);
            border-radius: 20px;
            padding: 44px 36px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            align-items: center;
            border: 1px solid rgba(34, 211, 238, 0.2);
            box-shadow: 0 12px 40px rgba(11, 18, 32, 0.3);
        }

        .subscribe-box h2 {
            font-size: 24px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }

        .subscribe-box p {
            color: #94a3b8;
            font-size: 14px;
            line-height: 1.7;
        }

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

        .subscribe-form input {
            flex: 1;
            min-width: 200px;
            padding: 13px 18px;
            border-radius: 10px;
            border: 1px solid #CBD5E1;
            background: #fff;
            color: var(--text-dark);
            font-size: 14px;
            transition: var(--transition);
        }

        .subscribe-form input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px var(--cyan-glow);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--nav-bg);
            color: #cbd5e1;
            padding: 48px 0 0;
            border-top: 2px solid var(--cyan);
        }

        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

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

        .footer-brand p {
            font-size: 13px;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 280px;
        }

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

        .footer-col a {
            display: block;
            color: #94a3b8;
            font-size: 13px;
            padding: 4px 0;
            transition: var(--transition);
        }

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

        .footer-bottom {
            padding: 20px 0 28px;
            text-align: center;
            font-size: 12px;
            color: #64748b;
            line-height: 1.8;
        }

        .footer-bottom a {
            color: #94a3b8;
        }

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

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 34px;
            }
            .hero-metrics {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .cards-grid.four-col {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .guarantee-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .brand-intro-card {
                grid-template-columns: 1fr;
                padding: 28px;
            }
            .footer-main {
                grid-template-columns: 1fr 1fr;
            }
            .calendar-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        @media (max-width: 768px) {
            section {
                padding: 52px 0;
            }
            .section-title {
                font-size: 23px;
            }
            .nav-menu {
                display: none;
            }
            .header-cta {
                display: none;
            }
            .hamburger {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .mobile-menu.open {
                display: block;
            }
            .hero {
                padding: 64px 0 56px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .hero-actions {
                flex-direction: column;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-metrics {
                grid-template-columns: 1fr 1fr;
                padding: 14px;
            }
            .hero-metric-number {
                font-size: 22px;
            }
            .cards-grid,
            .cards-grid.four-col,
            .cards-grid.two-col {
                grid-template-columns: 1fr;
            }
            .data-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .guarantee-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .calendar-grid {
                grid-template-columns: repeat(2, 1fr);
                padding: 12px;
            }
            .article-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .article-thumb {
                width: 100%;
                height: 140px;
            }
            .subscribe-box {
                grid-template-columns: 1fr;
                padding: 30px 22px;
            }
            .subscribe-form {
                flex-direction: column;
            }
            .subscribe-form input {
                min-width: unset;
                width: 100%;
            }
            .footer-main {
                grid-template-columns: 1fr;
                gap: 22px;
            }
            .brand-intro-card {
                padding: 22px;
            }
            .brand-intro-image img {
                height: 160px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero h1 {
                font-size: 23px;
            }
            .hero-metrics {
                grid-template-columns: 1fr;
            }
            .guarantee-grid {
                grid-template-columns: 1fr;
            }
            .calendar-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 20px;
            }
            .btn {
                padding: 11px 20px;
                font-size: 14px;
            }
            .logo-text {
                font-size: 17px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 16px;
            }
            .header-inner {
                height: 58px;
            }
        }

        .scroll-tab {
            display: inline-block;
            background: var(--card);
            border-radius: 10px;
            padding: 8px 16px;
            font-size: 13px;
            font-weight: 500;
            border: 1px solid var(--border);
            color: var(--text-mid);
            transition: var(--transition);
            cursor: pointer;
            white-space: nowrap;
        }

        .scroll-tab:hover {
            border-color: var(--cyan);
            color: var(--primary);
        }

/* roulang page: category2 */
:root {
            --primary: #1D6FDC;
            --primary-hover: #2563EB;
            --cyan: #22D3EE;
            --cyan-glow: rgba(34, 211, 238, 0.45);
            --gold: #F5B942;
            --gold-light: #FBBF24;
            --violet: #7C3AED;
            --bg: #F5F7FB;
            --bg-alt: #EEF3F9;
            --card: #FFFFFF;
            --border: #E2E8F0;
            --text-dark: #0F172A;
            --text-mid: #475569;
            --text-light: #64748B;
            --nav-bg: #0B1220;
            --radius-card: 18px;
            --radius-btn: 12px;
            --shadow-card: 0 8px 24px rgba(29, 111, 220, 0.08);
            --shadow-hover: 0 14px 36px rgba(29, 111, 220, 0.14);
            --transition: all 0.25s ease;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
        }

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

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-dark);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            cursor: pointer;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--cyan-glow);
            outline-offset: 2px;
            border-radius: 6px;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            background: var(--nav-bg);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
            border-bottom: 2px solid var(--cyan);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            box-shadow: 0 0 18px rgba(34, 211, 238, 0.4);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

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

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }

        .nav-menu a {
            color: #cbd5e1;
            font-size: 15px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-menu a:hover {
            color: #fff;
            background: rgba(34, 211, 238, 0.08);
        }

        .nav-menu a.active {
            color: var(--cyan);
            text-shadow: 0 0 12px var(--cyan-glow);
        }

        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px var(--cyan-glow);
        }

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

        .btn-nav-cta {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
            display: inline-block;
            white-space: nowrap;
        }

        .btn-nav-cta:hover {
            box-shadow: 0 0 32px rgba(34, 211, 238, 0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .hamburger {
            display: none;
            background: transparent;
            color: #fff;
            font-size: 24px;
            padding: 6px 10px;
            border-radius: 8px;
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .mobile-menu {
            display: none;
            background: var(--nav-bg);
            padding: 0 24px 24px;
            border-top: 1px solid rgba(34, 211, 238, 0.2);
        }

        .mobile-menu a {
            display: block;
            color: #cbd5e1;
            padding: 12px 8px;
            font-size: 16px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 6px;
        }

        .mobile-menu a:hover {
            color: var(--cyan);
            background: rgba(34, 211, 238, 0.08);
        }

        .mobile-menu a.active {
            color: var(--cyan);
            font-weight: 600;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            box-shadow: 0 4px 18px rgba(34, 211, 238, 0.3);
        }

        .btn-primary:hover {
            box-shadow: 0 8px 32px rgba(34, 211, 238, 0.5);
            transform: translateY(-2px);
            color: #fff;
        }

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

        .btn-secondary:hover {
            background: #EFF6FF;
            transform: translateY(-2px);
        }

        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.4);
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--cyan);
            color: var(--cyan);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 18px 0 0;
            font-size: 14px;
            color: var(--text-light);
        }

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

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

        .breadcrumb .separator {
            margin: 0 8px;
            color: #cbd5e1;
        }

        .breadcrumb .current {
            color: var(--primary);
            font-weight: 500;
        }

        /* ===== Category Header ===== */
        .category-header {
            padding: 36px 0 28px;
            display: flex;
            align-items: flex-start;
            gap: 28px;
            flex-wrap: wrap;
        }

        .category-header-img {
            width: 180px;
            height: 180px;
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            flex-shrink: 0;
            border: 1px solid var(--border);
        }

        .category-header-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .category-header-content {
            flex: 1;
            min-width: 280px;
        }

        .category-header-content h1 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .category-header-content h1 .highlight {
            color: var(--primary);
            position: relative;
        }

        .category-header-content h1 .highlight::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--cyan);
            border-radius: 4px;
            opacity: 0.4;
        }

        .category-desc {
            font-size: 16px;
            color: var(--text-mid);
            line-height: 1.8;
            max-width: 720px;
        }

        .category-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 16px;
        }

        .tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            background: #EFF6FF;
            color: var(--primary);
            border: 1px solid rgba(29, 111, 220, 0.2);
            transition: var(--transition);
        }

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

        .tag-cyan {
            background: rgba(34, 211, 238, 0.1);
            color: #0891b2;
            border-color: rgba(34, 211, 238, 0.3);
        }

        .tag-cyan:hover {
            background: var(--cyan);
            color: #fff;
            border-color: var(--cyan);
        }

        .tag-gold {
            background: rgba(245, 185, 66, 0.12);
            color: #b8860b;
            border-color: rgba(245, 185, 66, 0.3);
        }

        .tag-gold:hover {
            background: var(--gold);
            color: #fff;
            border-color: var(--gold);
        }

        /* ===== Section Styles ===== */
        .section {
            padding: 56px 0;
        }

        .section-sm {
            padding: 40px 0;
        }

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

        .section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .section-title .icon {
            color: var(--primary);
            margin-right: 8px;
        }

        .section-subtitle {
            font-size: 15px;
            color: var(--text-light);
            margin-bottom: 28px;
            line-height: 1.7;
            max-width: 680px;
        }

        /* ===== Stats Bar ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .stat-card {
            background: var(--card);
            border-radius: var(--radius-card);
            padding: 24px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .stat-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .stat-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }

        .stat-number .unit {
            font-size: 16px;
            font-weight: 500;
            color: var(--text-mid);
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-mid);
            margin-top: 6px;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

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

        .card-img {
            width: 100%;
            height: 200px;
            overflow: hidden;
            position: relative;
        }

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

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

        .card-img .badge-overlay {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(11, 18, 32, 0.75);
            color: var(--cyan);
            font-size: 12px;
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 6px;
            letter-spacing: 0.5px;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(34, 211, 238, 0.4);
        }

        .card-body {
            padding: 20px 22px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .card-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
            line-height: 1.5;
            transition: var(--transition);
        }

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

        .card-excerpt {
            font-size: 14px;
            color: var(--text-mid);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 14px;
        }

        .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-light);
            padding-top: 12px;
            border-top: 1px solid var(--border);
        }

        .card-meta .date {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .card-link {
            color: var(--primary);
            font-weight: 600;
            font-size: 13px;
            display: flex;
            align-items: center;
            gap: 4px;
        }

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

        /* ===== Data Table ===== */
        .data-panel {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }

        .data-panel-header {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }

        .data-panel-header h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
        }

        .data-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 24px;
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
            gap: 16px;
            flex-wrap: wrap;
        }

        .data-row:last-child {
            border-bottom: none;
        }

        .data-row:hover {
            background: #F8FAFC;
        }

        .data-row-left {
            display: flex;
            align-items: center;
            gap: 14px;
            flex: 1;
            min-width: 200px;
        }

        .data-rank {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
            flex-shrink: 0;
        }

        .rank-1 {
            background: rgba(245, 185, 66, 0.2);
            color: #b8860b;
        }

        .rank-2 {
            background: rgba(148, 163, 184, 0.2);
            color: #475569;
        }

        .rank-3 {
            background: rgba(205, 127, 50, 0.2);
            color: #8B4513;
        }

        .rank-other {
            background: #F1F5F9;
            color: var(--text-light);
        }

        .data-name {
            font-weight: 600;
            font-size: 15px;
            color: var(--text-dark);
        }

        .data-sub {
            font-size: 13px;
            color: var(--text-light);
        }

        .data-row-right {
            display: flex;
            align-items: center;
            gap: 20px;
            font-size: 14px;
        }

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

        .data-trend {
            display: flex;
            align-items: center;
            gap: 3px;
            font-size: 13px;
            font-weight: 600;
        }

        .trend-up {
            color: #16a34a;
        }

        .trend-down {
            color: #dc2626;
        }

        /* ===== Related Topics ===== */
        .topic-card {
            background: var(--card);
            border-radius: var(--radius-card);
            padding: 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            text-align: center;
        }

        .topic-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .topic-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            margin: 0 auto 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: #fff;
        }

        .topic-icon-blue {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
        }

        .topic-icon-gold {
            background: linear-gradient(135deg, var(--gold-light), var(--gold));
        }

        .topic-icon-violet {
            background: linear-gradient(135deg, #a78bfa, var(--violet));
        }

        .topic-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 6px;
        }

        .topic-desc {
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-hover);
        }

        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 15px;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            user-select: none;
        }

        .faq-question .fa-chevron-down {
            font-size: 14px;
            color: var(--text-light);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 24px;
            font-size: 14px;
            color: var(--text-mid);
            line-height: 1.8;
        }

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

        /* ===== CTA Section ===== */
        .cta-section {
            background: linear-gradient(135deg, #0B1220 0%, #1e293b 100%);
            border-radius: 20px;
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(34, 211, 238, 0.1);
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -5%;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(124, 58, 237, 0.15);
        }

        .cta-content {
            flex: 1;
            min-width: 280px;
            position: relative;
            z-index: 1;
        }

        .cta-content h3 {
            font-size: 24px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .cta-content h3 .highlight {
            color: var(--cyan);
        }

        .cta-content p {
            color: #cbd5e1;
            font-size: 15px;
            line-height: 1.7;
        }

        .cta-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--nav-bg);
            padding: 48px 0 24px;
            margin-top: 40px;
            color: #cbd5e1;
        }

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

        .footer-brand .logo-text {
            font-size: 24px;
            margin-bottom: 10px;
        }

        .footer-brand p {
            font-size: 14px;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: #94a3b8;
            padding: 6px 0;
            transition: var(--transition);
        }

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

        .footer-bottom {
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 13px;
            color: #64748b;
            text-align: center;
        }

        .footer-bottom p {
            margin-bottom: 4px;
        }

        .footer-bottom a {
            color: #94a3b8;
        }

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

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-main {
                grid-template-columns: 1fr 1fr;
            }
            .category-header-img {
                width: 140px;
                height: 140px;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .header-cta {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .mobile-menu.show {
                display: block;
            }
            .header-inner {
                height: 60px;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                font-size: 22px;
            }
            .category-header {
                padding: 24px 0 16px;
                gap: 18px;
            }
            .category-header-img {
                width: 110px;
                height: 110px;
            }
            .category-header-content h1 {
                font-size: 26px;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .stat-number {
                font-size: 24px;
            }
            .cta-section {
                padding: 32px 24px;
            }
            .footer-main {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .category-header {
                flex-direction: column;
            }
            .category-header-img {
                width: 100%;
                height: 180px;
            }
            .data-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .data-row-right {
                width: 100%;
                justify-content: space-between;
            }
            .cta-actions {
                width: 100%;
            }
            .cta-actions .btn {
                width: 100%;
                justify-content: center;
            }

/* roulang page: category1 */
:root {
            --primary: #1D6FDC;
            --primary-hover: #2563EB;
            --cyan: #22D3EE;
            --cyan-glow: rgba(34, 211, 238, 0.45);
            --gold: #F5B942;
            --gold-light: #FBBF24;
            --violet: #7C3AED;
            --bg: #F5F7FB;
            --bg-alt: #EEF3F9;
            --card: #FFFFFF;
            --border: #E2E8F0;
            --text-dark: #0F172A;
            --text-mid: #475569;
            --text-light: #64748B;
            --nav-bg: #0B1220;
            --radius-card: 18px;
            --radius-btn: 12px;
            --shadow-card: 0 8px 24px rgba(29, 111, 220, 0.08);
            --shadow-hover: 0 14px 36px rgba(29, 111, 220, 0.14);
            --transition: all 0.25s ease;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-dark);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            cursor: pointer;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--cyan-glow);
            outline-offset: 2px;
            border-radius: 6px;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            background: var(--nav-bg);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
            border-bottom: 2px solid var(--cyan);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 16px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            box-shadow: 0 0 18px rgba(34, 211, 238, 0.4);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-text span {
            color: var(--cyan);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }
        .nav-menu a {
            color: #cbd5e1;
            font-size: 15px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-menu a:hover {
            color: #fff;
            background: rgba(34, 211, 238, 0.08);
        }
        .nav-menu a.active {
            color: var(--cyan);
            text-shadow: 0 0 12px var(--cyan-glow);
        }
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px var(--cyan-glow);
        }
        .header-cta {
            flex-shrink: 0;
        }
        .btn-nav-cta {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
            display: inline-block;
            white-space: nowrap;
        }
        .btn-nav-cta:hover {
            box-shadow: 0 0 32px rgba(34, 211, 238, 0.55);
            transform: translateY(-1px);
            color: #fff;
        }
        .hamburger {
            display: none;
            background: transparent;
            color: #fff;
            font-size: 24px;
            padding: 6px 10px;
            border-radius: 8px;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .mobile-menu {
            display: none;
            background: var(--nav-bg);
            padding: 0 24px 24px;
            border-top: 1px solid rgba(34, 211, 238, 0.2);
        }
        .mobile-menu a {
            display: block;
            color: #cbd5e1;
            padding: 12px 8px;
            font-size: 16px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 6px;
        }
        .mobile-menu a:hover {
            color: var(--cyan);
            background: rgba(34, 211, 238, 0.08);
        }
        .mobile-menu a.active {
            color: var(--cyan);
            font-weight: 600;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            box-shadow: 0 4px 14px rgba(34, 211, 238, 0.25);
        }
        .btn-primary:hover {
            box-shadow: 0 8px 24px rgba(34, 211, 238, 0.4);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-secondary {
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
        }
        .btn-secondary:hover {
            background: #EFF6FF;
            transform: translateY(-2px);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 20px 0 0;
            font-size: 14px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--text-mid);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .separator {
            margin: 0 8px;
            color: #94a3b8;
        }
        .breadcrumb .current {
            color: var(--text-dark);
            font-weight: 500;
        }

        /* ===== Category Header ===== */
        .category-header {
            padding: 48px 0 36px;
        }
        .category-header-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .category-header-info .category-tag {
            display: inline-block;
            background: rgba(34, 211, 238, 0.1);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }
        .category-header-info h1 {
            font-size: 40px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--text-dark);
        }
        .category-header-info h1 .highlight {
            color: var(--primary);
        }
        .category-header-info .category-desc {
            font-size: 18px;
            color: var(--text-mid);
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .category-header-image {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            aspect-ratio: 16/9;
        }
        .category-header-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* ===== Section ===== */
        .section {
            padding: 68px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-dark);
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-light);
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .section-header {
            margin-bottom: 36px;
        }
        .section-header .section-title {
            margin-bottom: 8px;
        }

        /* ===== Article Cards ===== */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .article-card {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .article-card-image {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-alt);
        }
        .article-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .article-card:hover .article-card-image img {
            transform: scale(1.03);
        }
        .article-card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .article-card-tag {
            display: inline-block;
            background: rgba(29, 111, 220, 0.08);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 12px;
            margin-bottom: 12px;
            width: fit-content;
        }
        .article-card-title {
            font-size: 18px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 10px;
            color: var(--text-dark);
        }
        .article-card-title a:hover {
            color: var(--primary);
        }
        .article-card-excerpt {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }
        .article-card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-light);
            padding-top: 14px;
            border-top: 1px solid var(--border);
        }
        .article-card-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-card-meta i {
            color: var(--cyan);
        }

        /* ===== Stats Bar ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 28px 24px;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-number .unit {
            font-size: 18px;
            font-weight: 600;
            margin-left: 2px;
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-mid);
            font-weight: 500;
        }

        /* ===== Topic Section ===== */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .topic-card {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 28px;
            display: flex;
            gap: 16px;
            align-items: flex-start;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .topic-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .topic-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.12), rgba(29, 111, 220, 0.12));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 22px;
            flex-shrink: 0;
        }
        .topic-content h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-dark);
        }
        .topic-content p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .topic-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .topic-link:hover {
            color: var(--primary-hover);
            gap: 10px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            margin-bottom: 14px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-hover);
        }
        .faq-question {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            background: none;
            width: 100%;
            text-align: left;
        }
        .faq-question .faq-toggle {
            flex-shrink: 0;
            color: var(--cyan);
            font-size: 18px;
            transition: var(--transition);
        }
        .faq-item.open .faq-question .faq-toggle {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-mid);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-box {
            background: var(--nav-bg);
            border-radius: var(--radius-card);
            padding: 48px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--cyan), var(--primary), var(--violet));
        }
        .cta-box h2 {
            font-size: 26px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .cta-box p {
            font-size: 16px;
            color: #cbd5e1;
            line-height: 1.7;
            margin-bottom: 28px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-form {
            display: flex;
            gap: 12px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .cta-form input {
            flex: 1;
            min-width: 200px;
            padding: 14px 18px;
            border-radius: var(--radius-btn);
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            font-size: 15px;
            transition: var(--transition);
        }
        .cta-form input::placeholder {
            color: #94a3b8;
        }
        .cta-form input:focus {
            border-color: var(--cyan);
            box-shadow: 0 0 16px var(--cyan-glow);
            outline: none;
        }
        .cta-form .btn-primary {
            white-space: nowrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--nav-bg);
            color: #cbd5e1;
            padding: 56px 0 28px;
            border-top: 2px solid var(--cyan);
        }
        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .logo-text {
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #94a3b8;
            max-width: 300px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: #94a3b8;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--cyan);
        }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: space-between;
            align-items: center;
        }
        .footer-bottom p {
            font-size: 13px;
            color: #64748b;
            margin: 0;
        }
        .footer-bottom a {
            font-size: 13px;
            color: #64748b;
        }
        .footer-bottom a:hover {
            color: var(--cyan);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .nav-menu {
                gap: 0;
            }
            .nav-menu a {
                padding: 8px 10px;
                font-size: 14px;
            }
            .category-header-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-main {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                height: 60px;
            }
            .nav-menu {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .mobile-menu.open {
                display: block;
            }
            .section {
                padding: 48px 0;
            }
            .category-header {
                padding: 32px 0 24px;
            }
            .category-header-info h1 {
                font-size: 30px;
            }
            .category-header-info .category-desc {
                font-size: 16px;
            }
            .section-title {
                font-size: 24px;
            }
            .article-grid {
                grid-template-columns: 1fr;
            }
            .topic-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .cta-box {
                padding: 36px 24px;
            }
            .cta-box h2 {
                font-size: 22px;
            }
            .footer-main {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-header-info h1 {
                font-size: 26px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .stat-number {
                font-size: 28px;
            }
            .article-card-body {
                padding: 18px;
            }
            .cta-form {
                flex-direction: column;
            }
            .cta-form input {
                width: 100%;
                min-width: auto;
            }
            .cta-form .btn-primary {
                width: 100%;
                justify-content: center;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #1D6FDC;
            --primary-hover: #2563EB;
            --cyan: #22D3EE;
            --cyan-glow: rgba(34, 211, 238, 0.45);
            --gold: #F5B942;
            --gold-light: #FBBF24;
            --violet: #7C3AED;
            --bg: #F5F7FB;
            --bg-alt: #EEF3F9;
            --card: #FFFFFF;
            --border: #E2E8F0;
            --text-dark: #0F172A;
            --text-mid: #475569;
            --text-light: #64748B;
            --nav-bg: #0B1220;
            --radius-card: 18px;
            --radius-btn: 12px;
            --shadow-card: 0 8px 24px rgba(29, 111, 220, 0.08);
            --shadow-hover: 0 14px 36px rgba(29, 111, 220, 0.14);
            --transition: all 0.25s ease;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
        }

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

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-dark);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            cursor: pointer;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--cyan-glow);
            outline-offset: 2px;
            border-radius: 6px;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header / Navigation */
        .site-header {
            background: var(--nav-bg);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
            border-bottom: 2px solid var(--cyan);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            box-shadow: 0 0 18px rgba(34, 211, 238, 0.4);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

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

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }

        .nav-menu a {
            color: #cbd5e1;
            font-size: 15px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-menu a:hover {
            color: #fff;
            background: rgba(34, 211, 238, 0.08);
        }

        .nav-menu a.active {
            color: var(--cyan);
            text-shadow: 0 0 12px var(--cyan-glow);
        }

        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px var(--cyan-glow);
        }

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

        .btn-nav-cta {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
            display: inline-block;
            white-space: nowrap;
        }

        .btn-nav-cta:hover {
            box-shadow: 0 0 32px rgba(34, 211, 238, 0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .hamburger {
            display: none;
            background: transparent;
            color: #fff;
            font-size: 24px;
            padding: 6px 10px;
            border-radius: 8px;
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .mobile-menu {
            display: none;
            background: var(--nav-bg);
            padding: 0 24px 24px;
            border-top: 1px solid rgba(34, 211, 238, 0.2);
        }

        .mobile-menu a {
            display: block;
            color: #cbd5e1;
            padding: 12px 8px;
            font-size: 16px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 6px;
        }

        .mobile-menu a:hover {
            color: var(--cyan);
            background: rgba(34, 211, 238, 0.08);
        }

        .mobile-menu a.active {
            color: var(--cyan);
            font-weight: 600;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            box-shadow: 0 4px 16px rgba(34, 211, 238, 0.3);
        }

        .btn-primary:hover {
            box-shadow: 0 8px 28px rgba(34, 211, 238, 0.5);
            transform: translateY(-2px);
            color: #fff;
        }

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

        .btn-secondary:hover {
            background: #EFF6FF;
            transform: translateY(-2px);
            color: var(--primary-hover);
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
            padding: 20px 0 0;
            flex-wrap: wrap;
        }

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

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

        .breadcrumb .sep {
            color: #cbd5e1;
        }

        .breadcrumb .current {
            color: var(--text-dark);
            font-weight: 600;
        }

        /* Category Header */
        .category-header {
            display: flex;
            align-items: center;
            gap: 32px;
            padding: 48px 0 40px;
            flex-wrap: wrap;
        }

        .category-header-text {
            flex: 1;
            min-width: 280px;
        }

        .category-header-text h1 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .category-header-text p {
            font-size: 17px;
            color: var(--text-mid);
            margin-bottom: 16px;
            max-width: 680px;
        }

        .category-header-image {
            width: 420px;
            max-width: 100%;
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
        }

        .category-header-image img {
            width: 100%;
            height: 260px;
            object-fit: cover;
        }

        /* Stats bar */
        .stats-bar {
            display: flex;
            gap: 32px;
            padding: 24px 0;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .stat-item {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .stat-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: #EFF6FF;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }

        .stat-number {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.2;
        }

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

        /* Section title */
        .section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
            line-height: 1.35;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-light);
            margin-bottom: 32px;
            max-width: 640px;
        }

        /* Cards grid */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 48px;
        }

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

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

        .story-card-image {
            position: relative;
            height: 200px;
            overflow: hidden;
        }

        .story-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

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

        .story-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            background: rgba(11, 18, 32, 0.8);
            color: var(--gold-light);
            font-size: 12px;
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 20px;
            backdrop-filter: blur(4px);
            letter-spacing: 0.3px;
        }

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

        .story-card-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
            line-height: 1.45;
        }

        .story-card-body p {
            font-size: 14px;
            color: var(--text-mid);
            margin-bottom: 16px;
            flex: 1;
            line-height: 1.7;
        }

        .story-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 14px;
        }

        .story-meta i {
            color: var(--primary);
            margin-right: 4px;
        }

        .btn-read {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
        }

        .btn-read:hover {
            color: var(--primary-hover);
            gap: 10px;
        }

        /* Featured story */
        .featured-story {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 32px;
            margin-bottom: 48px;
            display: flex;
            gap: 32px;
            align-items: center;
            flex-wrap: wrap;
        }

        .featured-story-image {
            width: 360px;
            max-width: 100%;
            border-radius: 12px;
            overflow: hidden;
        }

        .featured-story-image img {
            width: 100%;
            height: 240px;
            object-fit: cover;
        }

        .featured-story-content {
            flex: 1;
            min-width: 260px;
        }

        .featured-story-content .tag {
            display: inline-block;
            background: #EFF6FF;
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
        }

        .featured-story-content h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .featured-story-content p {
            font-size: 15px;
            color: var(--text-mid);
            margin-bottom: 16px;
        }

        /* Topic section */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-bottom: 48px;
        }

        .topic-card {
            background: var(--card);
            border-radius: 14px;
            border: 1px solid var(--border);
            padding: 20px;
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow-card);
        }

        .topic-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
            border-color: var(--cyan);
        }

        .topic-card i {
            font-size: 26px;
            color: var(--primary);
            margin-bottom: 10px;
            display: block;
        }

        .topic-card h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-dark);
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto 48px;
        }

        .faq-item {
            background: var(--card);
            border-radius: 14px;
            border: 1px solid var(--border);
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-card);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-dark);
            font-size: 16px;
            gap: 16px;
            background: transparent;
            width: 100%;
            text-align: left;
        }

        .faq-question i {
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            padding: 0 24px;
        }

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

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

        /* CTA section */
        .cta-section {
            background: var(--nav-bg);
            border-radius: var(--radius-card);
            padding: 48px 40px;
            text-align: center;
            margin-bottom: 48px;
            border: 1px solid rgba(34, 211, 238, 0.2);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.2), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

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

        .cta-section p {
            color: #cbd5e1;
            font-size: 16px;
            margin-bottom: 24px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Footer */
        .site-footer {
            background: var(--nav-bg);
            color: #cbd5e1;
            padding: 56px 0 0;
            border-top: 2px solid var(--cyan);
        }

        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

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

        .footer-brand p {
            font-size: 14px;
            color: #94a3b8;
            max-width: 300px;
            line-height: 1.7;
        }

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

        .footer-col a {
            display: block;
            color: #94a3b8;
            font-size: 14px;
            margin-bottom: 10px;
            transition: var(--transition);
        }

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

        .footer-bottom {
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: #64748b;
        }

        .footer-bottom p {
            margin-bottom: 6px;
        }

        .footer-bottom a {
            color: #94a3b8;
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            .cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-main {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .mobile-menu.show {
                display: block;
            }
            .category-header {
                flex-direction: column-reverse;
                gap: 24px;
                padding: 32px 0 24px;
            }
            .category-header-image {
                width: 100%;
            }
            .category-header-text h1 {
                font-size: 28px;
            }
            .cards-grid {
                grid-template-columns: 1fr;
            }
            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .featured-story {
                flex-direction: column;
                padding: 24px;
            }
            .featured-story-image {
                width: 100%;
            }
            .stats-bar {
                gap: 16px;
            }
            .stat-item {
                flex: 1;
                min-width: 120px;
            }
            .cta-section {
                padding: 32px 20px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .section-title {
                font-size: 22px;
            }
        }

        @media (max-width: 520px) {
            .topic-grid {
                grid-template-columns: 1fr;
            }
            .footer-main {
                grid-template-columns: 1fr;
            }
            .stats-bar {
                flex-direction: column;
                gap: 16px;
            }
            .stat-item {
                min-width: auto;
            }
            .header-inner {
                height: 60px;
            }
            .logo-text {
                font-size: 17px;
            }
            .btn-nav-cta {
                padding: 8px 14px;
                font-size: 13px;
            }
        }

/* roulang page: category4 */
:root {
            --primary: #1D6FDC;
            --primary-hover: #2563EB;
            --cyan: #22D3EE;
            --cyan-glow: rgba(34, 211, 238, 0.45);
            --gold: #F5B942;
            --gold-light: #FBBF24;
            --violet: #7C3AED;
            --bg: #F5F7FB;
            --bg-alt: #EEF3F9;
            --card: #FFFFFF;
            --border: #E2E8F0;
            --text-dark: #0F172A;
            --text-mid: #475569;
            --text-light: #64748B;
            --nav-bg: #0B1220;
            --radius-card: 18px;
            --radius-btn: 12px;
            --shadow-card: 0 8px 24px rgba(29, 111, 220, 0.08);
            --shadow-hover: 0 14px 36px rgba(29, 111, 220, 0.14);
            --transition: all 0.25s ease;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
        }

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

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

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-dark);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            margin: 0;
        }

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

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

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            cursor: pointer;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid var(--cyan-glow);
            outline-offset: 2px;
            border-radius: 6px;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            background: var(--nav-bg);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
            border-bottom: 2px solid var(--cyan);
        }

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

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

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            box-shadow: 0 0 18px rgba(34, 211, 238, 0.4);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

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

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
            justify-content: center;
        }

        .nav-menu a {
            color: #cbd5e1;
            font-size: 15px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-menu a:hover {
            color: #fff;
            background: rgba(34, 211, 238, 0.08);
        }

        .nav-menu a.active {
            color: var(--cyan);
            text-shadow: 0 0 12px var(--cyan-glow);
        }

        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px var(--cyan-glow);
        }

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

        .btn-nav-cta {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
            display: inline-block;
            white-space: nowrap;
        }

        .btn-nav-cta:hover {
            box-shadow: 0 0 32px rgba(34, 211, 238, 0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .hamburger {
            display: none;
            background: transparent;
            color: #fff;
            font-size: 24px;
            padding: 6px 10px;
            border-radius: 8px;
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .mobile-menu {
            display: none;
            background: var(--nav-bg);
            padding: 0 24px 24px;
            border-top: 1px solid rgba(34, 211, 238, 0.2);
        }

        .mobile-menu a {
            display: block;
            color: #cbd5e1;
            padding: 12px 8px;
            font-size: 16px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 6px;
        }

        .mobile-menu a:hover {
            color: var(--cyan);
            background: rgba(34, 211, 238, 0.08);
        }

        .mobile-menu a.active {
            color: var(--cyan);
            font-weight: 600;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--cyan), var(--primary));
            color: #fff;
            box-shadow: 0 4px 16px rgba(34, 211, 238, 0.25);
        }

        .btn-primary:hover {
            box-shadow: 0 8px 28px rgba(34, 211, 238, 0.45);
            transform: translateY(-2px);
            color: #fff;
        }

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

        .btn-secondary:hover {
            background: #EFF6FF;
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 9px 18px;
            font-size: 14px;
            border-radius: 10px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }

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

        .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.4);
        }

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

        /* ===== Category Header ===== */
        .cat-header {
            background: linear-gradient(135deg, #0B1220 0%, #1a2a4a 50%, #0e1d38 100%);
            padding: 72px 0 64px;
            border-bottom: 1px solid rgba(34, 211, 238, 0.2);
            position: relative;
            overflow: hidden;
        }

        .cat-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('/assets/images/0330b212fc34eded.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            z-index: 0;
        }

        .cat-header::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(180deg, rgba(11, 18, 32, 0.75) 0%, rgba(11, 18, 32, 0.9) 100%);
            z-index: 0;
        }

        .cat-header .container {
            position: relative;
            z-index: 1;
        }

        .cat-header h1 {
            font-size: 38px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 16px;
            letter-spacing: 0.5px;
            line-height: 1.3;
        }

        .cat-header h1 .highlight {
            color: var(--cyan);
            text-shadow: 0 0 20px var(--cyan-glow);
        }

        .cat-header .cat-desc {
            font-size: 17px;
            color: #b6c3d6;
            max-width: 720px;
            line-height: 1.8;
            margin: 0 0 24px;
        }

        .cat-stats-bar {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            margin-top: 8px;
        }

        .cat-stat-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #cbd5e1;
            font-size: 14px;
        }

        .cat-stat-item i {
            color: var(--cyan);
            font-size: 16px;
        }

        .cat-stat-item strong {
            color: #fff;
            font-weight: 700;
            font-size: 16px;
        }

        /* ===== Section ===== */
        .section {
            padding: 68px 0;
        }

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

        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-dark);
            margin: 0 0 12px;
            letter-spacing: 0.3px;
            line-height: 1.4;
        }

        .section-sub {
            font-size: 16px;
            color: var(--text-light);
            max-width: 680px;
            line-height: 1.75;
            margin: 0 0 40px;
        }

        /* ===== Rating Stars ===== */
        .stars {
            display: inline-flex;
            gap: 2px;
            color: var(--gold);
            font-size: 14px;
        }

        .stars .far {
            color: #cbd5e1;
        }

        /* ===== Badge ===== */
        .badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }

        .badge-cyan {
            background: rgba(34, 211, 238, 0.12);
            color: #0e7490;
        }

        .badge-gold {
            background: rgba(245, 185, 66, 0.18);
            color: #b45309;
        }

        .badge-blue {
            background: rgba(29, 111, 220, 0.1);
            color: var(--primary);
        }

        .badge-violet {
            background: rgba(124, 58, 237, 0.1);
            color: var(--violet);
        }

        /* ===== Review Cards ===== */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

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

        .review-card-img {
            position: relative;
            aspect-ratio: 16/10;
            overflow: hidden;
        }

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

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

        .review-card-img .badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(4px);
        }

        .review-card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .review-card-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-dark);
            margin: 0 0 8px;
            line-height: 1.5;
        }

        .review-card-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
            font-size: 13px;
            color: var(--text-light);
        }

        .review-card-desc {
            font-size: 14px;
            color: var(--text-mid);
            line-height: 1.7;
            margin: 0 0 16px;
            flex: 1;
        }

        .review-card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding-top: 14px;
            border-top: 1px solid var(--border);
        }

        .review-score {
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            color: var(--text-dark);
            font-size: 15px;
        }

        .review-score .score-num {
            color: var(--primary);
            font-size: 20px;
        }

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

        .review-link:hover {
            color: var(--primary-hover);
            gap: 8px;
        }

        /* ===== Spec Table ===== */
        .spec-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .spec-card {
            background: var(--card);
            border-radius: var(--radius-card);
            padding: 24px 20px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

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

        .spec-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: rgba(29, 111, 220, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 22px;
            color: var(--primary);
        }

        .spec-card:nth-child(2) .spec-icon {
            background: rgba(34, 211, 238, 0.1);
            color: #0e7490;
        }

        .spec-card:nth-child(3) .spec-icon {
            background: rgba(245, 185, 66, 0.14);
            color: #b45309;
        }

        .spec-card:nth-child(4) .spec-icon {
            background: rgba(124, 58, 237, 0.1);
            color: var(--violet);
        }

        .spec-label {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 4px;
        }

        .spec-value {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
        }

        /* ===== Ranking List ===== */
        .ranking-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .rank-item {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--card);
            border-radius: 14px;
            padding: 14px 18px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .rank-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateX(4px);
        }

        .rank-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 15px;
            flex-shrink: 0;
            background: rgba(29, 111, 220, 0.08);
            color: var(--primary);
        }

        .rank-num.top1 {
            background: linear-gradient(135deg, var(--gold), var(--gold-light));
            color: #fff;
        }

        .rank-num.top2 {
            background: rgba(34, 211, 238, 0.16);
            color: #0e7490;
        }

        .rank-num.top3 {
            background: rgba(245, 185, 66, 0.2);
            color: #b45309;
        }

        .rank-info {
            flex: 1;
            min-width: 0;
        }

        .rank-title {
            font-weight: 600;
            font-size: 15px;
            color: var(--text-dark);
            margin-bottom: 2px;
        }

        .rank-cat {
            font-size: 13px;
            color: var(--text-light);
        }

        .rank-score {
            font-weight: 700;
            font-size: 16px;
            color: var(--primary);
            flex-shrink: 0;
        }

        /* ===== Topic Cards ===== */
        .topic-row {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .topic-card {
            display: flex;
            gap: 16px;
            background: var(--card);
            border-radius: var(--radius-card);
            padding: 18px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            align-items: center;
        }

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

        .topic-card img {
            width: 100px;
            height: 80px;
            object-fit: cover;
            border-radius: 10px;
            flex-shrink: 0;
        }

        .topic-card-info {
            flex: 1;
            min-width: 0;
        }

        .topic-card-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 4px;
            line-height: 1.4;
        }

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

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

        .faq-item {
            background: var(--card);
            border-radius: 14px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(34, 211, 238, 0.4);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            background: transparent;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            text-align: left;
            cursor: pointer;
            transition: var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question .fa-chevron-down {
            font-size: 14px;
            color: var(--text-light);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }

        .faq-item.open .faq-question .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
            font-size: 14.5px;
            color: var(--text-mid);
            line-height: 1.75;
        }

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

        /* ===== CTA Section ===== */
        .cta-section {
            background: linear-gradient(135deg, #0B1220 0%, #142b4a 60%, #0e1d38 100%);
            padding: 68px 0;
            border-top: 2px solid rgba(34, 211, 238, 0.3);
        }

        .cta-box {
            max-width: 680px;
            margin: 0 auto;
            text-align: center;
        }

        .cta-box h2 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
        }

        .cta-box p {
            font-size: 16px;
            color: #b6c3d6;
            line-height: 1.7;
            margin: 0 0 28px;
        }

        .cta-form {
            display: flex;
            gap: 10px;
            max-width: 480px;
            margin: 0 auto;
        }

        .cta-form input {
            flex: 1;
            padding: 13px 20px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            font-size: 15px;
            transition: var(--transition);
        }

        .cta-form input::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }

        .cta-form input:focus {
            border-color: var(--cyan);
            box-shadow: 0 0 20px var(--cyan-glow);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--nav-bg);
            color: #cbd5e1;
            padding: 48px 0 24px;
            border-top: 2px solid rgba(34, 211, 238, 0.3);
        }

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

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

        .footer-brand p {
            font-size: 14px;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 320px;
            margin: 0;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 14px;
            letter-spacing: 0.3px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: #94a3b8;
            padding: 5px 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--cyan);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            flex-direction: column;
            gap: 6px;
            font-size: 13px;
            color: #64748b;
        }

        .footer-bottom p {
            margin: 0;
        }

        .footer-bottom a {
            color: #94a3b8;
        }

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

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

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

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

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

            .hamburger {
                display: block;
            }

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

            .header-cta {
                display: none;
            }

            .cat-header {
                padding: 48px 0 40px;
            }

            .cat-header h1 {
                font-size: 30px;
            }

            .section {
                padding: 48px 0;
            }

            .section-title {
                font-size: 24px;
            }

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

            .spec-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }

            .topic-row {
                grid-template-columns: 1fr;
            }

            .cta-form {
                flex-direction: column;
            }

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

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

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

            .cat-stats-bar {
                gap: 16px;
            }

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

            .section-title {
                font-size: 21px;
            }

            .rank-item {
                flex-wrap: wrap;
                gap: 10px;
            }
        }