/* roulang page: index */
:root {
            --color-brand: #1a6df5;
            --color-brand-dark: #1358e0;
            --color-accent: #f59e0b;
            --color-accent-dark: #d97706;
            --color-text: #1e293b;
            --color-text-weak: #64748b;
            --color-bg: #ffffff;
            --color-bg-alt: #f8fafc;
            --color-border: #e2e8f0;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 2px 8px rgba(0, 0, 0, 0.08), 0 8px 32px rgba(0, 0, 0, 0.06);
            --transition-fast: 180ms ease;
            --transition-smooth: 280ms cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            line-height: 1.7;
            color: #1e293b;
            background-color: #ffffff;
            margin: 0;
            padding: 0;
            min-height: 100vh;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input {
            font-family: inherit;
        }

        /* 导航样式 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03), 0 4px 20px rgba(0, 0, 0, 0.03);
            transition: box-shadow var(--transition-smooth);
        }
        .site-header.scrolled {
            box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06), 0 6px 28px rgba(0, 0, 0, 0.07);
        }
        .nav-link {
            position: relative;
            font-weight: 500;
            font-size: 0.95rem;
            color: #475569;
            padding: 0.5rem 0.25rem;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2.5px;
            border-radius: 4px;
            background: var(--color-brand);
            transform: scaleX(0);
            transition: transform var(--transition-smooth);
            transform-origin: center;
        }
        .nav-link:hover {
            color: #1e293b;
        }
        .nav-link.active {
            color: var(--color-brand);
            font-weight: 600;
        }
        .nav-link.active::after {
            transform: scaleX(1);
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.6rem 1.4rem;
            border-radius: 999px;
            font-weight: 600;
            font-size: 0.9rem;
            background: var(--color-brand);
            color: #fff;
            transition: all var(--transition-smooth);
            box-shadow: 0 2px 8px rgba(26, 109, 245, 0.25);
            white-space: nowrap;
        }
        .nav-cta-btn:hover {
            background: var(--color-brand-dark);
            box-shadow: 0 4px 18px rgba(26, 109, 245, 0.4);
            transform: translateY(-1px);
        }

        /* 移动端菜单 */
        #mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 99;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 1.5rem;
            transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
        }
        #mobile-menu.open {
            display: flex;
            opacity: 1;
            visibility: visible;
        }
        .mobile-nav-link {
            font-size: 1.25rem;
            font-weight: 600;
            color: #334155;
            padding: 0.6rem 1.5rem;
            border-radius: 2rem;
            transition: all var(--transition-fast);
        }
        .mobile-nav-link.active {
            color: var(--color-brand);
            background: #eef4ff;
        }
        .mobile-nav-link:hover {
            color: var(--color-brand);
            background: #f8fafc;
        }

        /* Hero */
        .hero-section {
            position: relative;
            background: linear-gradient(160deg, #0f172a 0%, #1a2744 35%, #1e3050 65%, #162240 100%);
            overflow: hidden;
            min-height: 620px;
            display: flex;
            align-items: center;
        }
        .hero-bg-img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.28;
            pointer-events: none;
            mix-blend-mode: overlay;
        }
        .hero-glow {
            position: absolute;
            border-radius: 50%;
            filter: blur(120px);
            opacity: 0.18;
            pointer-events: none;
        }
        .hero-glow-1 {
            width: 500px;
            height: 500px;
            background: #3b82f6;
            top: -180px;
            right: -120px;
        }
        .hero-glow-2 {
            width: 380px;
            height: 380px;
            background: #f59e0b;
            bottom: -140px;
            left: -100px;
            opacity: 0.12;
        }

        /* 卡片通用 */
        .card-hover {
            transition: all var(--transition-smooth);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .stat-card {
            background: #fff;
            border-radius: var(--radius-xl);
            padding: 1.75rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-smooth);
            border: 1px solid transparent;
        }
        .stat-card:hover {
            border-color: #e2e8f0;
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }

        /* FAQ */
        .faq-item {
            border: 1px solid #e8ecf1;
            border-radius: var(--radius-lg);
            background: #fff;
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: #d0d7e2;
        }
        .faq-question {
            cursor: pointer;
            padding: 1.2rem 1.5rem;
            font-weight: 600;
            font-size: 1.02rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: background var(--transition-fast);
            color: #1e293b;
        }
        .faq-question:hover {
            background: #fafbfc;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 1.5rem;
            color: #475569;
            line-height: 1.8;
            font-size: 0.95rem;
        }
        .faq-item.open .faq-answer {
            max-height: 500px;
            padding: 0 1.5rem 1.3rem 1.5rem;
        }
        .faq-arrow {
            transition: transform var(--transition-smooth);
            flex-shrink: 0;
            font-size: 0.8rem;
            color: #94a3b8;
            margin-left: 0.75rem;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--color-brand);
        }

        /* 新闻卡片 */
        .news-card {
            background: #fff;
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-smooth);
            border: 1px solid transparent;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: #e8ecf1;
        }
        .news-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        /* 评价卡片 */
        .testimonial-card {
            background: #fff;
            border-radius: var(--radius-xl);
            padding: 1.75rem;
            box-shadow: var(--shadow-md);
            border: 1px solid #f1f5f9;
            transition: all var(--transition-smooth);
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: #e2e8f0;
        }

        /* 页脚 */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
        }
        .footer-link {
            color: #94a3b8;
            transition: color var(--transition-fast);
        }
        .footer-link:hover {
            color: #fff;
        }

        @media (max-width: 1024px) {
            .hero-section {
                min-height: 500px;
            }
            .stat-card {
                padding: 1.3rem 1rem;
            }
        }
        @media (max-width: 768px) {
            .hero-section {
                min-height: 440px;
                text-align: center;
            }
            .desktop-nav-links {
                display: none !important;
            }
            .mobile-hamburger {
                display: flex !important;
            }
            .news-card-img {
                height: 160px;
            }
            .faq-question {
                font-size: 0.95rem;
                padding: 1rem 1.2rem;
            }
        }
        @media (max-width: 520px) {
            .hero-section {
                min-height: 400px;
            }
            .stat-card {
                padding: 1rem 0.75rem;
            }
            .nav-cta-btn {
                padding: 0.5rem 1rem;
                font-size: 0.8rem;
            }
        }

        @media (min-width: 769px) {
            #mobile-menu {
                display: none !important;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #1a6df5;
            --primary-dark: #1557c8;
            --primary-light: #e8f1ff;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --dark: #0f172a;
            --dark-soft: #1e293b;
            --muted: #64748b;
            --muted-light: #94a3b8;
            --surface: #f8fafc;
            --border: #e2e8f0;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-card-hover: 0 10px 25px rgba(15, 23, 42, 0.10), 0 4px 8px rgba(15, 23, 42, 0.06);
            --shadow-nav: 0 1px 3px rgba(15, 23, 42, 0.04);
            --transition-fast: 180ms ease;
            --transition-base: 250ms ease;
        }

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

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

        body {
            margin: 0;
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            line-height: 1.7;
            color: #0f172a;
            background: #ffffff;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input,
        button {
            font-family: inherit;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: var(--shadow-nav);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
        }

        .nav-link {
            font-size: 0.925rem;
            font-weight: 500;
            color: #475569;
            padding: 0.4rem 0.6rem;
            border-radius: 0.5rem;
            transition: color var(--transition-fast), background var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: #1a6df5;
            background: #f1f5f9;
        }

        .nav-link.active {
            color: #1a6df5;
            font-weight: 600;
            background: #e8f1ff;
        }

        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.45rem;
            padding: 0.55rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: #ffffff;
            background: #1a6df5;
            border-radius: 2rem;
            transition: all var(--transition-base);
            box-shadow: 0 2px 8px rgba(26, 109, 245, 0.3);
            white-space: nowrap;
        }

        .nav-cta-btn:hover {
            background: #1557c8;
            box-shadow: 0 4px 16px rgba(26, 109, 245, 0.4);
            transform: translateY(-1px);
        }

        .mobile-hamburger span {
            display: block;
            height: 2px;
            background: #475569;
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .mobile-menu-open #bar1 {
            transform: translateY(7px) rotate(45deg);
        }
        .mobile-menu-open #bar2 {
            opacity: 0;
            transform: scaleX(0);
        }
        .mobile-menu-open #bar3 {
            width: 24px;
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-nav-panel {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            max-width: 85vw;
            height: 100vh;
            background: #fff;
            box-shadow: -4px 0 30px rgba(15, 23, 42, 0.12);
            z-index: 99;
            transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 5.5rem 1.5rem 2rem;
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }

        .mobile-nav-panel.open {
            right: 0;
        }
        .mobile-nav-overlay {
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 98;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease;
        }
        .mobile-nav-overlay.show {
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-nav-panel .nav-link {
            display: block;
            padding: 0.7rem 1rem;
            font-size: 1rem;
            border-radius: 0.6rem;
        }

        .hero-banner {
            background: linear-gradient(170deg, #f0f6ff 0%, #e8f1ff 40%, #f8fafc 100%);
            position: relative;
            overflow: hidden;
        }

        .hero-banner::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(26, 109, 245, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-banner::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -60px;
            width: 240px;
            height: 240px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.07) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .guide-card {
            background: #fff;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            overflow: hidden;
            border: 1px solid #f1f5f9;
        }

        .guide-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: #e2e8f0;
        }

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

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

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

        .badge-tag {
            display: inline-block;
            padding: 0.25rem 0.7rem;
            font-size: 0.78rem;
            font-weight: 600;
            border-radius: 2rem;
            letter-spacing: 0.01em;
        }

        .badge-primary {
            background: #e8f1ff;
            color: #1a6df5;
        }
        .badge-accent {
            background: #fef3c7;
            color: #d97706;
        }
        .badge-green {
            background: #dcfce7;
            color: #16a34a;
        }
        .badge-purple {
            background: #f3e8ff;
            color: #9333ea;
        }

        .tip-box {
            background: #fffbeb;
            border-left: 4px solid #f59e0b;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            padding: 1.1rem 1.3rem;
            font-size: 0.925rem;
            color: #78350f;
            line-height: 1.7;
        }

        .info-box {
            background: #f0f6ff;
            border-left: 4px solid #1a6df5;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            padding: 1.1rem 1.3rem;
            font-size: 0.925rem;
            color: #1e40af;
            line-height: 1.7;
        }

        .faq-item {
            border: 1px solid #e2e8f0;
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-fast);
            background: #fff;
        }

        .faq-item:hover {
            border-color: #cbd5e1;
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
        }

        .faq-question {
            width: 100%;
            padding: 1.1rem 1.4rem;
            background: none;
            border: none;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: #0f172a;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            transition: color var(--transition-fast);
        }

        .faq-question:hover {
            color: #1a6df5;
        }
        .faq-answer {
            padding: 0 1.4rem 1.2rem;
            font-size: 0.925rem;
            color: #475569;
            line-height: 1.75;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }
        .faq-icon {
            transition: transform 0.3s ease;
            flex-shrink: 0;
            color: #94a3b8;
            font-size: 1.2rem;
        }

        .site-footer {
            background: #0f172a;
            margin-top: auto;
        }

        .footer-link {
            color: #94a3b8;
            transition: color var(--transition-fast);
            font-size: 0.9rem;
        }
        .footer-link:hover {
            color: #e2e8f0;
        }

        .section-title-overline {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: #1a6df5;
            margin-bottom: 0.4rem;
        }

        .section-title {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0f172a;
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        @media (max-width: 1024px) {
            .desktop-nav-links {
                display: none !important;
            }
            .mobile-hamburger {
                display: flex !important;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }

        @media (min-width: 1025px) {
            .mobile-nav-panel,
            .mobile-nav-overlay {
                display: none !important;
            }
            .mobile-hamburger {
                display: none !important;
            }
        }

        @media (max-width: 768px) {
            .hero-banner {
                padding: 2.5rem 0;
            }
            .section-title {
                font-size: 1.35rem;
            }
            .guide-card-img-wrap {
                aspect-ratio: 16 / 9;
            }
        }

        @media (max-width: 520px) {
            .hero-banner {
                padding: 2rem 0;
            }
            .section-title {
                font-size: 1.2rem;
            }
            .nav-cta-btn {
                padding: 0.45rem 0.9rem;
                font-size: 0.8rem;
                gap: 0.3rem;
            }
            .nav-cta-btn svg {
                width: 15px;
                height: 15px;
            }
            .guide-card-img-wrap {
                aspect-ratio: 4 / 3;
            }
            .faq-question {
                font-size: 0.9rem;
                padding: 0.9rem 1rem;
            }
            .faq-answer {
                font-size: 0.85rem;
                padding: 0 1rem 1rem;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #1a6df5;
            --color-primary-hover: #1558c9;
            --color-primary-light: #3b82f6;
            --color-secondary: #0f172a;
            --color-surface: #f8fafc;
            --color-white: #ffffff;
            --color-text: #1e293b;
            --color-text-muted: #64748b;
            --color-text-weak: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.12), 0 8px 20px rgba(0, 0, 0, 0.06);
            --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-surface);
            overflow-x: hidden;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

        /* ============ HEADER & NAVIGATION ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base);
        }

        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }

        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-muted);
            padding: 0.35rem 0;
            transition: color var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2.5px;
            background: var(--color-primary);
            border-radius: 4px;
            transition: width var(--transition-base);
        }

        .nav-link:hover {
            color: var(--color-secondary);
        }

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

        .nav-link.active {
            color: var(--color-primary);
            font-weight: 600;
        }

        .nav-link.active::after {
            width: 100%;
        }

        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 10px 20px;
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            background: var(--color-primary);
            border-radius: 50px;
            white-space: nowrap;
            transition: all var(--transition-base);
            box-shadow: 0 4px 14px rgba(26, 109, 245, 0.3);
            letter-spacing: 0.02em;
        }

        .nav-cta-btn:hover {
            background: var(--color-primary-hover);
            box-shadow: 0 6px 22px rgba(26, 109, 245, 0.42);
            transform: translateY(-2px);
        }

        .nav-cta-btn:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 109, 245, 0.3);
        }

        /* Mobile Hamburger */
        .mobile-hamburger {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
        }

        .mobile-hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: #334155;
            border-radius: 3px;
            transition: all var(--transition-base);
        }

        .mobile-hamburger.open #bar1 {
            transform: translateY(7px) rotate(45deg);
        }

        .mobile-hamburger.open #bar2 {
            opacity: 0;
            transform: scaleX(0);
        }

        .mobile-hamburger.open #bar3 {
            transform: translateY(-7px) rotate(-45deg);
            width: 24px;
        }

        /* Mobile Menu Panel */
        .mobile-menu-panel {
            position: fixed;
            top: 0;
            right: 0;
            width: 300px;
            max-width: 85vw;
            height: 100vh;
            height: 100dvh;
            background: #fff;
            z-index: 99;
            box-shadow: var(--shadow-xl);
            transform: translateX(105%);
            transition: transform var(--transition-slow);
            padding: 90px 28px 40px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            overflow-y: auto;
        }

        .mobile-menu-panel.open {
            transform: translateX(0);
        }

        .mobile-menu-panel a {
            display: block;
            padding: 14px 18px;
            font-size: 1.05rem;
            font-weight: 500;
            color: var(--color-text);
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
        }

        .mobile-menu-panel a:hover,
        .mobile-menu-panel a.mobile-active {
            background: #eff6ff;
            color: var(--color-primary);
            font-weight: 600;
        }

        .mobile-menu-panel .mobile-cta-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-top: 16px;
            padding: 14px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            background: var(--color-primary);
            border-radius: 50px;
            text-align: center;
            box-shadow: 0 4px 16px rgba(26, 109, 245, 0.3);
        }

        .mobile-menu-overlay {
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 98;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-base);
        }

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

        /* ============ CATEGORY BANNER ============ */
        .category-banner {
            position: relative;
            background-size: cover;
            background-position: center 30%;
            background-repeat: no-repeat;
            min-height: 380px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.82) 0%, rgba(15, 23, 42, 0.55) 50%, rgba(26, 109, 245, 0.35) 100%);
            z-index: 1;
        }

        .category-banner .banner-content {
            position: relative;
            z-index: 2;
        }

        .category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            font-size: 0.82rem;
            font-weight: 600;
            color: #fff;
            background: rgba(255, 255, 255, 0.18);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 50px;
            backdrop-filter: blur(6px);
            letter-spacing: 0.04em;
        }

        /* ============ TAG PILLS ============ */
        .tag-pill {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 0.88rem;
            font-weight: 500;
            color: var(--color-text-muted);
            background: #fff;
            border: 1.5px solid var(--color-border);
            border-radius: 50px;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
            user-select: none;
        }

        .tag-pill:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: #f8faff;
            box-shadow: var(--shadow-sm);
        }

        .tag-pill.active-tag {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(26, 109, 245, 0.28);
        }

        /* ============ ARTICLE CARD ============ */
        .article-card {
            background: #fff;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            height: 100%;
            border: 1px solid var(--color-border-light);
        }

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

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

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

        .article-card:hover .card-img-wrap img {
            transform: scale(1.06);
        }

        .article-card .card-img-wrap .card-category-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            padding: 5px 13px;
            font-size: 0.75rem;
            font-weight: 600;
            color: #fff;
            background: var(--color-primary);
            border-radius: 50px;
            z-index: 2;
            letter-spacing: 0.03em;
        }

        .article-card .card-body {
            padding: 20px 22px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .article-card .card-date {
            font-size: 0.8rem;
            color: var(--color-text-weak);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-card .card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-secondary);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color var(--transition-fast);
        }

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

        .article-card .card-excerpt {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }

        .article-card .card-read-more {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-top: auto;
            transition: gap var(--transition-fast);
        }

        .article-card .card-read-more:hover {
            gap: 9px;
        }

        /* ============ FEATURED CARD (large) ============ */
        .featured-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            aspect-ratio: 21 / 9;
            min-height: 280px;
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            cursor: pointer;
        }

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

        .featured-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 23, 42, 0.85) 0%, rgba(15, 23, 42, 0.3) 50%, rgba(15, 23, 42, 0.05) 100%);
            z-index: 1;
            transition: opacity var(--transition-base);
        }

        .featured-card:hover::before {
            opacity: 0.9;
        }

        .featured-card .featured-content {
            position: relative;
            z-index: 2;
            padding: 28px 30px;
            width: 100%;
        }

        .featured-card .featured-label {
            display: inline-block;
            padding: 5px 14px;
            font-size: 0.75rem;
            font-weight: 700;
            color: #fff;
            background: var(--color-danger);
            border-radius: 50px;
            margin-bottom: 10px;
            letter-spacing: 0.04em;
        }

        .featured-card .featured-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.4;
            margin-bottom: 6px;
        }

        .featured-card .featured-meta {
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.75);
        }

        /* ============ STATS STRIP ============ */
        .stat-item {
            text-align: center;
            padding: 20px 16px;
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.1;
            letter-spacing: -0.02em;
        }

        .stat-label {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            margin-top: 6px;
            font-weight: 500;
        }

        /* ============ NEWSLETTER CTA ============ */
        .newsletter-box {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a3a6a 100%);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            position: relative;
            overflow: hidden;
        }

        .newsletter-box::after {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 220px;
            height: 220px;
            background: rgba(59, 130, 246, 0.2);
            border-radius: 50%;
            pointer-events: none;
        }

        .newsletter-input {
            flex: 1;
            padding: 14px 20px;
            font-size: 0.95rem;
            border: 2px solid rgba(255, 255, 255, 0.25);
            border-radius: 50px;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            outline: none;
            transition: all var(--transition-fast);
            min-width: 0;
        }

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

        .newsletter-input:focus {
            border-color: #60a5fa;
            background: rgba(255, 255, 255, 0.16);
            box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
        }

        .newsletter-submit {
            padding: 14px 28px;
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            background: var(--color-primary);
            border: none;
            border-radius: 50px;
            cursor: pointer;
            white-space: nowrap;
            transition: all var(--transition-base);
            box-shadow: 0 4px 16px rgba(26, 109, 245, 0.35);
            letter-spacing: 0.02em;
        }

        .newsletter-submit:hover {
            background: #2563eb;
            box-shadow: 0 6px 24px rgba(26, 109, 245, 0.5);
            transform: translateY(-2px);
        }

        /* ============ FOOTER ============ */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
        }

        .footer-link {
            color: #94a3b8;
            transition: color var(--transition-fast);
            font-size: 0.9rem;
        }

        .footer-link:hover {
            color: #fff;
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            .article-card .card-body {
                padding: 16px 18px 20px;
            }
            .article-card .card-title {
                font-size: 1rem;
            }
            .category-banner {
                min-height: 300px;
            }
            .featured-card {
                aspect-ratio: 16 / 8;
                min-height: 220px;
            }
            .featured-card .featured-title {
                font-size: 1.15rem;
            }
            .featured-card .featured-content {
                padding: 20px 22px;
            }
        }

        @media (max-width: 768px) {
            .desktop-nav-links {
                display: none !important;
            }
            .mobile-hamburger {
                display: flex !important;
                flex-direction: column;
                gap: 5px;
                padding: 8px;
                z-index: 101;
                position: relative;
                background: none;
                border: none;
                cursor: pointer;
            }
            .category-banner {
                min-height: 260px;
                background-position: center 35%;
            }
            .category-banner h1 {
                font-size: 1.8rem;
            }
            .article-card .card-img-wrap {
                aspect-ratio: 16 / 9;
            }
            .featured-card {
                aspect-ratio: 16 / 10;
                min-height: 200px;
            }
            .featured-card .featured-title {
                font-size: 1.05rem;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .newsletter-box {
                padding: 32px 22px;
            }
            .newsletter-box .flex-col-mobile {
                flex-direction: column;
            }
            .newsletter-submit {
                width: 100%;
                text-align: center;
                justify-content: center;
            }
            .tag-pill {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
        }

        @media (max-width: 520px) {
            .category-banner {
                min-height: 220px;
            }
            .category-banner h1 {
                font-size: 1.5rem;
            }
            .category-badge {
                font-size: 0.72rem;
                padding: 5px 12px;
            }
            .article-card .card-title {
                font-size: 0.95rem;
            }
            .article-card .card-excerpt {
                font-size: 0.82rem;
                -webkit-line-clamp: 2;
            }
            .article-card .card-body {
                padding: 14px 15px 18px;
            }
            .featured-card {
                aspect-ratio: 4 / 3;
                min-height: 180px;
            }
            .featured-card .featured-content {
                padding: 16px 16px;
            }
            .featured-card .featured-title {
                font-size: 0.95rem;
            }
            .stat-number {
                font-size: 1.5rem;
            }
            .stat-label {
                font-size: 0.78rem;
            }
            .mobile-menu-panel {
                width: 280px;
                max-width: 88vw;
                padding: 80px 20px 32px;
            }
        }

        /* Focus accessibility */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2.5px solid var(--color-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        .nav-cta-btn:focus-visible,
        .newsletter-submit:focus-visible {
            outline-color: #fff;
            outline-offset: 3px;
        }

/* roulang page: category4 */
:root {
            --brand: #1a6df5;
            --brand-hover: #1a5cd4;
            --brand-light: #eef5ff;
            --accent: #3b82f6;
            --surface: #f8fafc;
            --card: #ffffff;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --darkbg: #0f172a;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 16px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.07), 0 8px 28px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.09), 0 16px 48px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.10), 0 24px 64px rgba(0, 0, 0, 0.07);
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            margin: 0;
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            line-height: 1.65;
            color: var(--text);
            background: #fafbfc;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input {
            font-family: inherit;
        }
        main {
            flex: 1;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        @media(min-width:768px) {
            .container {
                padding: 0 2rem;
            }
        }
        @media(min-width:1024px) {
            .container {
                padding: 0 2.5rem;
            }
        }

        /* ===== HEADER & NAV ===== */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .nav-link {
            position: relative;
            font-size: 0.925rem;
            font-weight: 500;
            color: #475569;
            padding: 0.4rem 0.2rem;
            transition: color var(--transition);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .nav-link:hover {
            color: var(--brand);
        }
        .nav-link.active {
            color: var(--brand);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2.5px;
            background: var(--brand);
            border-radius: 4px;
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: var(--brand);
            color: #fff;
            padding: 0.6rem 1.35rem;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            transition: all var(--transition);
            white-space: nowrap;
            box-shadow: 0 2px 8px rgba(26, 109, 245, 0.25);
        }
        .nav-cta-btn:hover {
            background: var(--brand-hover);
            box-shadow: 0 4px 14px rgba(26, 109, 245, 0.35);
            transform: translateY(-1px);
        }
        .mobile-hamburger span {
            display: block;
            transition: all 0.3s ease;
        }
        .mobile-hamburger.open #bar1 {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-hamburger.open #bar2 {
            opacity: 0;
        }
        .mobile-hamburger.open #bar3 {
            width: 24px;
            transform: rotate(-45deg) translate(5px, -5px);
        }
        .mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            max-width: 85vw;
            height: 100vh;
            background: #fff;
            z-index: 100;
            padding: 5rem 1.5rem 2rem;
            box-shadow: var(--shadow-xl);
            transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            overflow-y: auto;
        }
        .mobile-menu.open {
            right: 0;
        }
        .mobile-menu-backdrop {
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 99;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease;
        }
        .mobile-menu-backdrop.open {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu .nav-link {
            display: block;
            padding: 0.75rem 0;
            font-size: 1.05rem;
            border-bottom: 1px solid var(--border-light);
        }
        .mobile-menu .nav-link.active {
            color: var(--brand);
            font-weight: 600;
        }
        .mobile-menu .nav-cta-btn {
            margin-top: 1rem;
            display: flex;
            justify-content: center;
        }

        /* ===== PAGE BANNER ===== */
        .page-banner {
            position: relative;
            background: linear-gradient(150deg, #0f172a 0%, #1e293b 40%, #1a3a5c 70%, #0f2744 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.22;
            mix-blend-mode: overlay;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 50%;
            background: linear-gradient(to top, rgba(15, 23, 42, 0.85), transparent);
            pointer-events: none;
        }
        .page-banner-content {
            position: relative;
            z-index: 2;
            padding: 4rem 0;
        }
        .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(59, 130, 246, 0.2);
            border: 1px solid rgba(59, 130, 246, 0.35);
            color: #93c5fd;
            padding: 0.4rem 1rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 0.03em;
            backdrop-filter: blur(6px);
        }

        /* ===== SECTION COMMON ===== */
        .section {
            padding: 4.5rem 0;
        }
        @media(min-width:768px) {
            .section {
                padding: 5.5rem 0;
            }
        }
        @media(min-width:1024px) {
            .section {
                padding: 6.5rem 0;
            }
        }
        .section-alt {
            background: #f1f5f9;
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: #0f172a;
            letter-spacing: -0.01em;
            margin-bottom: 0.35rem;
        }
        @media(min-width:768px) {
            .section-title {
                font-size: 2rem;
            }
        }
        .section-subtitle {
            font-size: 1rem;
            color: #64748b;
            line-height: 1.6;
            max-width: 640px;
        }

        /* ===== CARDS ===== */
        .card {
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: #dde6f0;
        }
        .card-clickable {
            cursor: pointer;
        }
        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: #e2e8f0;
        }
        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .card:hover .card-img-wrap img {
            transform: scale(1.04);
        }
        .card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--brand);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.25rem 0.7rem;
            border-radius: 50px;
            letter-spacing: 0.02em;
            z-index: 2;
        }
        .card-badge-hot {
            background: #ef4444;
        }
        .card-badge-recruiting {
            background: #10b981;
        }
        .tag {
            display: inline-block;
            background: #eef5ff;
            color: #1a6df5;
            font-size: 0.78rem;
            font-weight: 500;
            padding: 0.25rem 0.7rem;
            border-radius: 50px;
            letter-spacing: 0.01em;
            transition: all var(--transition);
        }
        .tag:hover {
            background: #d9e8ff;
            color: #1a5cd4;
        }

        /* ===== STAT CARDS ===== */
        .stat-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 1.75rem 1.5rem;
            border: 1px solid var(--border-light);
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: #0f172a;
            letter-spacing: -0.02em;
            line-height: 1;
        }
        @media(min-width:768px) {
            .stat-number {
                font-size: 2.8rem;
            }
        }
        .stat-number .plus {
            color: var(--brand);
        }

        /* ===== LIST ITEMS ===== */
        .discussion-item {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            padding: 1.15rem 1.25rem;
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            cursor: pointer;
        }
        .discussion-item:hover {
            border-color: #cbd5e1;
            box-shadow: var(--shadow);
            transform: translateX(3px);
        }
        .discussion-avatar {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: linear-gradient(135deg, #1a6df5, #3b82f6);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .discussion-meta {
            font-size: 0.8rem;
            color: #94a3b8;
        }

        /* ===== FAQ ===== */
        .faq-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
            background: #fff;
        }
        .faq-item:hover {
            border-color: #cbd5e1;
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 1.2rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            color: #1e293b;
            background: #fff;
            border: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            cursor: pointer;
            transition: all var(--transition);
            letter-spacing: 0.01em;
        }
        .faq-question:hover {
            background: #f8fafc;
            color: var(--brand);
        }
        .faq-arrow {
            transition: transform 0.3s ease;
            flex-shrink: 0;
            color: #94a3b8;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--brand);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 1.5rem;
            color: #475569;
            line-height: 1.7;
            font-size: 0.95rem;
        }
        .faq-item.open .faq-answer {
            max-height: 600px;
            padding: 0 1.5rem 1.3rem;
        }

        /* ===== CTA SECTION ===== */
        .cta-section {
            background: linear-gradient(150deg, #0f172a 0%, #1e3a5f 50%, #1a3a5c 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.1;
            mix-blend-mode: soft-light;
        }
        .cta-btn-lg {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #fff;
            color: #0f172a;
            padding: 0.85rem 2rem;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 700;
            letter-spacing: 0.02em;
            transition: all var(--transition);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        }
        .cta-btn-lg:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(0, 0, 0, 0.3);
            background: #f1f5f9;
        }
        .cta-btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            border: 2px solid rgba(255, 255, 255, 0.6);
            color: #fff;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            font-size: 0.95rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            transition: all var(--transition);
            backdrop-filter: blur(4px);
        }
        .cta-btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        /* ===== FOOTER ===== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
        }
        .footer-link {
            color: #94a3b8;
            transition: color var(--transition);
            font-size: 0.9rem;
        }
        .footer-link:hover {
            color: #fff;
        }

        /* ===== RESPONSIVE ===== */
        @media(max-width:1023px) {
            .desktop-nav-links {
                display: none !important;
            }
            .mobile-hamburger {
                display: flex !important;
            }
        }
        @media(min-width:1024px) {
            .mobile-hamburger {
                display: none !important;
            }
            .mobile-menu,
            .mobile-menu-backdrop {
                display: none !important;
            }
        }
        @media(max-width:767px) {
            .page-banner {
                min-height: 260px;
            }
            .page-banner-content {
                padding: 2.5rem 0;
            }
            .section {
                padding: 3rem 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .stat-number {
                font-size: 2rem;
            }
            .card-img-wrap {
                aspect-ratio: 16 / 11;
            }
        }
        @media(max-width:520px) {
            .page-banner {
                min-height: 220px;
            }
            .page-banner-content {
                padding: 2rem 0;
            }
            .section {
                padding: 2.5rem 0;
            }
            .section-title {
                font-size: 1.35rem;
            }
            .discussion-item {
                flex-direction: column;
                gap: 0.5rem;
            }
        }

/* roulang page: category2 */
:root {
            --brand: #1a6df5;
            --brand-dark: #10459f;
            --brand-light: #dbeafe;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --deep: #0f172a;
            --surface: #f8fafc;
            --muted: #64748b;
            --border: #e2e8f0;
            --text: #1e293b;
            --text-weak: #64748b;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
            --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.10);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.14);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: #ffffff;
            overflow-x: hidden;
        }

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

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

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

        input {
            font-family: inherit;
            outline: none;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }

        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text);
            padding: 0.35rem 0;
            transition: color var(--transition);
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2.5px;
            border-radius: 4px;
            background: var(--brand);
            transition: width var(--transition);
        }
        .nav-link:hover {
            color: var(--brand);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: var(--brand);
            font-weight: 600;
        }
        .nav-link.active::after {
            width: 100%;
        }

        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.45rem;
            padding: 0.6rem 1.3rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            background: var(--brand);
            border-radius: 50px;
            transition: all var(--transition);
            white-space: nowrap;
            box-shadow: 0 4px 14px rgba(26, 109, 245, 0.3);
        }
        .nav-cta-btn:hover {
            background: var(--brand-dark);
            box-shadow: 0 6px 20px rgba(26, 109, 245, 0.42);
            transform: translateY(-1px);
        }
        .nav-cta-btn:active {
            transform: scale(0.97);
            box-shadow: 0 2px 8px rgba(26, 109, 245, 0.25);
        }

        /* Mobile Nav */
        .mobile-nav-panel {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            max-width: 85vw;
            height: 100vh;
            background: #fff;
            z-index: 200;
            box-shadow: -8px 0 32px rgba(0, 0, 0, 0.15);
            transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 5rem 1.5rem 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.25rem;
            overflow-y: auto;
        }
        .mobile-nav-panel.open {
            right: 0;
        }
        .mobile-nav-overlay {
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 199;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        .mobile-nav-overlay.show {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-nav-link {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text);
            padding: 0.6rem 0;
            display: block;
            border-bottom: 1px solid var(--border);
            transition: color var(--transition);
        }
        .mobile-nav-link:hover,
        .mobile-nav-link.active {
            color: var(--brand);
        }
        .mobile-nav-cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            background: var(--brand);
            border-radius: 50px;
            margin-top: 0.5rem;
            text-align: center;
            transition: all var(--transition);
        }
        .mobile-nav-cta:hover {
            background: var(--brand-dark);
        }

        /* Hamburger animation */
        .mobile-hamburger.open #bar1 {
            transform: rotate(45deg) translate(5px, 6px);
        }
        .mobile-hamburger.open #bar2 {
            opacity: 0;
        }
        .mobile-hamburger.open #bar3 {
            width: 24px;
            transform: rotate(-45deg) translate(5px, -6px);
        }

        /* ===== Responsive Nav ===== */
        @media (max-width: 768px) {
            .desktop-nav-links {
                display: none !important;
            }
            .mobile-hamburger {
                display: flex !important;
            }
        }
        @media (min-width: 769px) {
            .desktop-nav-links {
                display: flex !important;
            }
            .mobile-hamburger {
                display: none !important;
            }
            .mobile-nav-panel,
            .mobile-nav-overlay {
                display: none;
            }
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            min-height: 380px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.82) 0%, rgba(15, 23, 42, 0.55) 40%, rgba(26, 109, 245, 0.35) 100%);
            z-index: 1;
        }
        .page-banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 2rem 1.5rem;
            max-width: 720px;
        }

        /* ===== Section ===== */
        .section-padding {
            padding: 4rem 1.5rem;
        }
        @media (min-width: 768px) {
            .section-padding {
                padding: 5rem 2rem;
            }
        }
        @media (min-width: 1024px) {
            .section-padding {
                padding: 6rem 2rem;
            }
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--deep);
            text-align: center;
            margin-bottom: 0.5rem;
            letter-spacing: -0.02em;
        }
        @media (min-width: 768px) {
            .section-title {
                font-size: 2rem;
            }
        }
        .section-subtitle {
            font-size: 0.95rem;
            color: var(--muted);
            text-align: center;
            margin-bottom: 2.5rem;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        @media (min-width: 768px) {
            .section-subtitle {
                font-size: 1.05rem;
                margin-bottom: 3rem;
            }
        }

        /* ===== Live Badge ===== */
        .live-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.25rem 0.75rem;
            font-size: 0.78rem;
            font-weight: 700;
            color: #fff;
            background: #ef4444;
            border-radius: 50px;
            animation: livePulse 2s infinite;
        }
        @keyframes livePulse {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.5);
            }
            50% {
                box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
            }
        }
        .live-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #fff;
            animation: dotBlink 0.8s infinite alternate;
        }
        @keyframes dotBlink {
            from {
                opacity: 1;
            }
            to {
                opacity: 0.3;
            }
        }

        /* ===== Card ===== */
        .match-card {
            background: #fff;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .match-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: #cbd5e1;
        }
        .match-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        @media (min-width: 768px) {
            .match-card-img {
                height: 220px;
            }
        }

        /* ===== Schedule Row ===== */
        .schedule-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
            padding: 1rem 1.25rem;
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .schedule-row:hover {
            box-shadow: var(--shadow);
            border-color: #cbd5e1;
        }

        /* ===== Stat Card ===== */
        .stat-card {
            text-align: center;
            padding: 1.5rem;
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--brand);
            letter-spacing: -0.03em;
            line-height: 1;
        }
        @media (min-width: 768px) {
            .stat-number {
                font-size: 2.6rem;
            }
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1a2740 50%, #0f1f3a 100%);
            border-radius: var(--radius-lg);
            padding: 2.5rem 1.5rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        @media (min-width: 768px) {
            .cta-section {
                padding: 3.5rem 2.5rem;
            }
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(26, 109, 245, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        /* ===== FAQ ===== */
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 1.25rem 1.5rem;
            background: #fff;
            transition: all var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: #cbd5e1;
            box-shadow: var(--shadow-sm);
        }
        .faq-item summary {
            font-weight: 600;
            font-size: 1rem;
            color: var(--deep);
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '+';
            font-size: 1.4rem;
            font-weight: 400;
            color: var(--brand);
            flex-shrink: 0;
            transition: transform var(--transition);
        }
        .faq-item[open] summary::after {
            content: '−';
            transform: rotate(180deg);
        }
        .faq-answer {
            margin-top: 0.75rem;
            color: var(--text-weak);
            font-size: 0.93rem;
            line-height: 1.75;
            padding-top: 0.75rem;
            border-top: 1px solid var(--border);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
        }
        .footer-link {
            color: #94a3b8;
            transition: color var(--transition);
        }
        .footer-link:hover {
            color: #fff;
        }

        /* ===== Misc ===== */
        .tag {
            display: inline-block;
            padding: 0.2rem 0.65rem;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 50px;
            background: #eff6ff;
            color: #1a6df5;
            letter-spacing: 0.01em;
        }
        .tag-orange {
            background: #fffbeb;
            color: #d97706;
        }
        .tag-green {
            background: #ecfdf5;
            color: #059669;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.7rem 1.6rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            background: var(--brand);
            border-radius: 50px;
            transition: all var(--transition);
            box-shadow: 0 4px 14px rgba(26, 109, 245, 0.28);
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            box-shadow: 0 6px 20px rgba(26, 109, 245, 0.4);
            transform: translateY(-1px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.65rem 1.5rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--brand);
            background: #fff;
            border: 2px solid var(--brand);
            border-radius: 50px;
            transition: all var(--transition);
        }
        .btn-outline:hover {
            background: var(--brand-light);
            border-color: var(--brand-dark);
            color: var(--brand-dark);
        }
        .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.7rem 1.6rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--deep);
            background: #fff;
            border-radius: 50px;
            transition: all var(--transition);
            box-shadow: 0 4px 14px rgba(255, 255, 255, 0.18);
        }
        .btn-white:hover {
            background: #f1f5f9;
            box-shadow: 0 6px 20px rgba(255, 255, 255, 0.28);
            transform: translateY(-1px);
        }

        @media (max-width: 520px) {
            .section-title {
                font-size: 1.4rem;
            }
            .section-subtitle {
                font-size: 0.88rem;
            }
            .match-card-img {
                height: 160px;
            }
            .stat-number {
                font-size: 1.7rem;
            }
            .page-banner {
                min-height: 280px;
            }
        }