/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1a2e;
            --primary-light: #1a2d4a;
            --primary-dark: #0a1220;
            --accent: #f59e0b;
            --accent-hover: #d48a08;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-alt: #ffffff;
            --bg-dark: #0f1a2e;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(15, 26, 46, 0.08);
            --shadow-lg: 0 12px 48px rgba(15, 26, 46, 0.12);
            --shadow-accent: 0 4px 20px rgba(245, 158, 11, 0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--primary);
        }
        h1 {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2.5vw, 1.6rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--text-light);
        }
        p:last-child {
            margin-bottom: 0;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            margin-bottom: 12px;
        }
        .section-title p {
            max-width: 640px;
            margin: 0 auto;
            font-size: 1.1rem;
        }
        .text-accent {
            color: var(--accent);
        }
        .text-center {
            text-align: center;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            box-shadow: var(--shadow-accent);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(245, 158, 11, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-secondary {
            background: var(--primary);
            color: #fff;
        }
        .btn-secondary:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.1rem;
            border-radius: var(--radius);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.9rem;
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--accent-light);
            color: var(--accent-hover);
            border: 1px solid rgba(245, 158, 11, 0.2);
        }
        .badge-primary {
            background: var(--primary);
            color: #fff;
            border: none;
        }
        .badge-sm {
            padding: 2px 10px;
            font-size: 0.7rem;
        }

        /* ===== Header & Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 26, 46, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            height: var(--header-height);
            transition: var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
        }
        .logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .logo:hover {
            color: var(--accent);
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: var(--text-white);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--accent);
        }
        .nav-list a.active {
            background: rgba(245, 158, 11, 0.12);
            color: var(--accent);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--accent);
        }
        .nav-cta {
            margin-left: 12px;
            padding: 8px 20px !important;
            background: var(--accent) !important;
            color: var(--primary-dark) !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 700 !important;
        }
        .nav-cta:hover {
            background: var(--accent-hover) !important;
            color: var(--primary-dark) !important;
            transform: translateY(-1px);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: var(--header-height);
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 46, 0.85) 0%, rgba(15, 26, 46, 0.6) 50%, rgba(15, 26, 46, 0.85) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 80px 24px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 20px;
            border-radius: 50px;
            background: rgba(245, 158, 11, 0.12);
            border: 1px solid rgba(245, 158, 11, 0.2);
            color: var(--accent);
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 24px;
        }
        .hero h1 {
            color: #fff;
            margin-bottom: 20px;
            max-width: 860px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero h1 span {
            color: var(--accent);
        }
        .hero p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.2rem;
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: center;
            margin-top: 60px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .hero-stat .label {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 4px;
        }

        /* ===== Features / 核心说明 ===== */
        .features {
            background: var(--bg-alt);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .feature-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 36px 28px;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--accent);
        }
        .feature-card .icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: var(--accent-light);
            color: var(--accent-hover);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }
        .feature-card h3 {
            margin-bottom: 12px;
        }
        .feature-card p {
            font-size: 0.95rem;
        }

        /* ===== Categories / 分类入口 ===== */
        .categories {
            background: var(--bg);
        }
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--primary);
            min-height: 260px;
            display: flex;
            align-items: flex-end;
            transition: var(--transition);
            cursor: pointer;
        }
        .category-card .bg-img {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            transition: var(--transition);
        }
        .category-card:hover .bg-img {
            opacity: 0.4;
            transform: scale(1.05);
        }
        .category-card .content {
            position: relative;
            z-index: 1;
            padding: 32px;
            width: 100%;
            background: linear-gradient(0deg, rgba(15, 26, 46, 0.9) 0%, transparent 100%);
        }
        .category-card .badge {
            margin-bottom: 12px;
        }
        .category-card h3 {
            color: #fff;
            margin-bottom: 8px;
        }
        .category-card p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            margin-bottom: 16px;
        }
        .category-card .btn {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .category-card .btn:hover {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
        }

        /* ===== Latest Posts / 最新资讯 ===== */
        .latest-posts {
            background: var(--bg-alt);
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .post-card {
            background: var(--bg);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .post-card .thumb {
            height: 200px;
            background: var(--primary-light);
            position: relative;
            overflow: hidden;
        }
        .post-card .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .post-card:hover .thumb img {
            transform: scale(1.05);
        }
        .post-card .thumb .badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: var(--primary-dark);
            border: none;
        }
        .post-card .body {
            padding: 24px;
        }
        .post-card .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .post-card .meta i {
            margin-right: 4px;
        }
        .post-card h3 {
            font-size: 1.1rem;
            margin-bottom: 12px;
            line-height: 1.5;
        }
        .post-card h3 a {
            color: var(--primary);
        }
        .post-card h3 a:hover {
            color: var(--accent);
        }
        .post-card p {
            font-size: 0.92rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .read-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--accent-hover);
            margin-top: 16px;
        }
        .post-card .read-more:hover {
            gap: 10px;
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-light);
            background: var(--bg);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }
        .posts-empty i {
            font-size: 3rem;
            color: var(--border);
            margin-bottom: 16px;
            display: block;
        }

        /* ===== Data / 平台数据 ===== */
        .data-section {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }
        .data-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .data-section .container {
            position: relative;
            z-index: 1;
        }
        .data-section .section-title h2 {
            color: #fff;
        }
        .data-section .section-title p {
            color: rgba(255, 255, 255, 0.6);
        }
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .data-item {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
        }
        .data-item:hover {
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-4px);
        }
        .data-item .num {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .data-item .num span {
            font-size: 1.6rem;
            font-weight: 600;
        }
        .data-item .label {
            color: rgba(255, 255, 255, 0.6);
            font-size: 1rem;
            margin-top: 8px;
        }
        .data-item .desc {
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.85rem;
            margin-top: 4px;
        }

        /* ===== Process / 使用流程 ===== */
        .process {
            background: var(--bg);
        }
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .process-steps::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), var(--border), var(--border), var(--accent));
            z-index: 0;
        }
        .step {
            text-align: center;
            position: relative;
            z-index: 1;
            padding: 0 8px;
        }
        .step .circle {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--bg-alt);
            border: 3px solid var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent);
            box-shadow: 0 0 0 6px rgba(245, 158, 11, 0.1);
            transition: var(--transition);
        }
        .step:hover .circle {
            background: var(--accent);
            color: var(--primary-dark);
            box-shadow: 0 0 0 12px rgba(245, 158, 11, 0.15);
        }
        .step h4 {
            margin-bottom: 8px;
            color: var(--primary);
        }
        .step p {
            font-size: 0.9rem;
        }

        /* ===== FAQ ===== */
        .faq {
            background: var(--bg-alt);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--primary);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 16px;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            font-size: 1.2rem;
            color: var(--accent);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.1;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 80px 24px;
        }
        .cta-section h2 {
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.1rem;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.6);
            padding: 60px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            margin-bottom: 16px;
            font-size: 1.2rem;
        }
        .footer-brand p {
            font-size: 0.92rem;
            max-width: 320px;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            padding: 4px 0;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.92rem;
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-size: 0.85rem;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: var(--primary-dark);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .posts-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps::before {
                display: none;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(15, 26, 46, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 8px;
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                pointer-events: none;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1.05rem;
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-list a.active {
                background: rgba(245, 158, 11, 0.15);
                border-left: 3px solid var(--accent);
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 8px;
                text-align: center;
            }
            .hero {
                min-height: 80vh;
            }
            .hero h1 {
                font-size: clamp(1.8rem, 6vw, 2.6rem);
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-stat .num {
                font-size: 1.6rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .categories-grid {
                grid-template-columns: 1fr;
            }
            .posts-grid {
                grid-template-columns: 1fr;
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .data-item .num {
                font-size: 2rem;
            }
            .process-steps {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .section-padding {
                padding: 56px 0;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero .container {
                padding: 60px 16px;
            }
            .data-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .data-item {
                padding: 20px 12px;
            }
            .data-item .num {
                font-size: 1.6rem;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .category-card .content {
                padding: 20px;
            }
            .post-card .body {
                padding: 18px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px 16px;
            }
            .cta-section .container {
                padding: 56px 16px;
            }
            .site-footer {
                padding: 40px 0 24px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-light);
        }

        /* ===== Selection ===== */
        ::selection {
            background: var(--accent);
            color: var(--primary-dark);
        }

        /* ===== Focus ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== Smooth image loading ===== */
        .post-card .thumb img {
            transition: var(--transition);
        }

        /* ===== Utility ===== */
        .mt-1 {
            margin-top: 8px;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mt-3 {
            margin-top: 24px;
        }
        .mb-1 {
            margin-bottom: 8px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .gap-1 {
            gap: 8px;
        }
        .gap-2 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
            --secondary: #0f172a;
            --accent: #f59e0b;
            --accent-light: #fef3c7;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .logo i {
            font-size: 26px;
            color: var(--primary);
            background: var(--primary-light);
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: transform var(--transition);
        }
        .logo:hover i {
            transform: rotate(-8deg) scale(1.05);
        }
        .logo:hover {
            color: var(--text);
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a i {
            margin-right: 6px;
            font-size: 14px;
        }
        .nav-list a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }
        .nav-list a.nav-cta {
            background: var(--primary-gradient);
            color: #fff;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }
        .nav-list a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 6px;
            border: none;
            background: none;
        }
        .nav-toggle span {
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 3px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 8px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                z-index: 999;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                padding: 12px 16px;
                font-size: 17px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-list a.nav-cta {
                text-align: center;
                margin-top: 6px;
            }
        }

        /* ===== Article Banner ===== */
        .article-banner {
            background: var(--secondary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 80px 0 60px;
            position: relative;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.70) 100%);
            z-index: 1;
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
        }
        .article-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
            transition: color var(--transition);
        }
        .article-banner .breadcrumb a:hover {
            color: #fff;
        }
        .article-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.5);
        }
        .article-banner .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.35);
        }
        .article-banner .post-category {
            display: inline-block;
            background: var(--accent);
            color: var(--secondary);
            font-size: 13px;
            font-weight: 700;
            padding: 4px 16px;
            border-radius: 20px;
            letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .article-banner h1 {
            font-size: 38px;
            color: #fff;
            max-width: 820px;
            line-height: 1.25;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }
        .article-banner .post-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
            flex-wrap: wrap;
        }
        .article-banner .post-meta i {
            margin-right: 5px;
            opacity: 0.7;
        }
        @media (max-width: 768px) {
            .article-banner {
                padding: 50px 0 40px;
            }
            .article-banner h1 {
                font-size: 26px;
            }
            .article-banner .post-meta {
                gap: 12px;
                font-size: 13px;
            }
        }
        @media (max-width: 520px) {
            .article-banner h1 {
                font-size: 22px;
            }
        }

        /* ===== Article Content ===== */
        .article-section {
            padding: 60px 0 80px;
            background: var(--bg);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-main {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            padding: 40px 44px;
            min-height: 400px;
        }
        .article-main .article-body {
            font-size: 17px;
            line-height: 1.85;
            color: var(--text-secondary);
        }
        .article-main .article-body p {
            margin-bottom: 20px;
        }
        .article-main .article-body h2 {
            font-size: 26px;
            margin: 40px 0 16px;
            color: var(--text);
        }
        .article-main .article-body h3 {
            font-size: 20px;
            margin: 32px 0 12px;
            color: var(--text);
        }
        .article-main .article-body ul,
        .article-main .article-body ol {
            margin: 0 0 20px 24px;
            list-style: disc;
        }
        .article-main .article-body li {
            margin-bottom: 8px;
        }
        .article-main .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 24px 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-main .article-body img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            width: 100%;
            object-fit: cover;
        }
        .article-main .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-main .article-body a:hover {
            color: var(--primary-dark);
        }
        .article-main .article-body code {
            background: var(--bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            border: 1px solid var(--border-light);
        }
        .article-main .article-body pre {
            background: var(--secondary);
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 24px 0;
            font-size: 15px;
            line-height: 1.6;
        }
        .article-not-found {
            text-align: center;
            padding: 60px 20px;
        }
        .article-not-found i {
            font-size: 56px;
            color: var(--text-light);
            margin-bottom: 20px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 28px;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .article-not-found .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        /* ===== Article Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 18px;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h3 i {
            color: var(--primary);
        }
        .sidebar-card .related-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .sidebar-card .related-list a {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.4;
        }
        .sidebar-card .related-list a:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }
        .sidebar-card .related-list a i {
            color: var(--primary);
            font-size: 12px;
            margin-top: 4px;
            flex-shrink: 0;
        }
        .sidebar-card .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-card .tag-cloud a {
            display: inline-block;
            padding: 4px 14px;
            background: var(--bg-alt);
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-secondary);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .sidebar-card .tag-cloud a:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary);
        }
        .sidebar-card .cta-box {
            text-align: center;
            padding: 8px 0;
        }
        .sidebar-card .cta-box p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }
        .sidebar-card .cta-box .btn {
            width: 100%;
            justify-content: center;
        }

        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-main {
                padding: 28px 24px;
            }
        }
        @media (max-width: 768px) {
            .article-section {
                padding: 40px 0 60px;
            }
            .article-main {
                padding: 20px 16px;
            }
            .article-main .article-body {
                font-size: 16px;
            }
            .article-main .article-body h2 {
                font-size: 22px;
            }
            .article-main .article-body h3 {
                font-size: 18px;
            }
        }

        /* ===== Related Posts Section ===== */
        .related-section {
            padding: 0 0 60px;
            background: var(--bg);
        }
        .related-section .section-title {
            font-size: 24px;
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section .section-title i {
            color: var(--primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .related-card .card-img {
            height: 180px;
            background: var(--bg-alt);
            overflow: hidden;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 20px 20px 24px;
        }
        .related-card .card-body h4 {
            font-size: 17px;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card .card-body h4 a {
            color: var(--text);
            transition: color var(--transition);
        }
        .related-card .card-body h4 a:hover {
            color: var(--primary);
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-top: 14px;
            font-size: 13px;
            color: var(--text-light);
        }
        .related-card .card-meta i {
            margin-right: 4px;
        }

        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-section .section-title {
                font-size: 20px;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(37, 99, 235, 0.4);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 17px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 20px;
            margin-bottom: 16px;
            display: inline-flex;
        }
        .footer-brand .logo i {
            background: rgba(255, 255, 255, 0.12);
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            padding: 5px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 28px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.6);
            font-size: 16px;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ===== Focus visible ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== Responsive fine-tune ===== */
        @media (max-width: 520px) {
            .article-banner h1 {
                font-size: 20px;
            }
            .article-main .article-body {
                font-size: 15px;
            }
            .article-main .article-body h2 {
                font-size: 20px;
            }
            .sidebar-card {
                padding: 20px 16px;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 15px;
            }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a4d8f;
            --primary-light: #2a6bc1;
            --primary-dark: #0e2d5a;
            --secondary: #f0b429;
            --secondary-light: #f5c84d;
            --accent: #1a9e8f;
            --bg-white: #ffffff;
            --bg-light: #f6f9fc;
            --bg-dark: #0e1a2b;
            --bg-section-alt: #eef3f9;
            --text-dark: #1a2332;
            --text-body: #2d3a4f;
            --text-light: #6b7a8f;
            --text-white: #f0f3f8;
            --border: #dce3ed;
            --border-light: #e8edf4;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(26, 45, 70, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 45, 70, 0.08);
            --shadow-lg: 0 16px 48px rgba(26, 45, 70, 0.12);
            --shadow-xl: 0 24px 64px rgba(26, 45, 70, 0.16);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --spacing-section: 5rem;
            --spacing-block: 3rem;
            --container-max: 1200px;
            --header-height: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            color: var(--text-body);
            background: var(--bg-white);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--primary-light);
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--secondary);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 0.6rem 1rem;
            background: var(--bg-white);
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        input:focus,
        select:focus,
        textarea:focus {
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(26, 75, 143, 0.15);
            outline: none;
        }
        ul,
        ol {
            list-style: none;
            padding: 0;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-dark);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
        }
        h1 {
            font-size: clamp(2rem, 4.5vw, 3.2rem);
        }
        h2 {
            font-size: clamp(1.5rem, 3vw, 2.2rem);
        }
        h3 {
            font-size: clamp(1.15rem, 1.8vw, 1.45rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--text-body);
        }
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--primary);
            background: rgba(26, 75, 143, 0.08);
            padding: 0.3rem 1rem;
            border-radius: 100px;
            margin-bottom: 1rem;
        }
        .section-label i {
            font-size: 0.7rem;
        }
        .section-title {
            margin-bottom: 0.75rem;
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 680px;
            margin-bottom: 2.5rem;
        }
        .text-center {
            text-align: center;
        }
        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }
        .grid-2,
        .grid-3,
        .grid-4 {
            display: grid;
            gap: 1.8rem;
        }
        .grid-2 {
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        }
        .grid-3 {
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        }
        .grid-4 {
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .gap-1 {
            gap: 1rem;
        }
        .gap-2 {
            gap: 1.5rem;
        }
        .mt-2 {
            margin-top: 1.5rem;
        }
        .mb-2 {
            margin-bottom: 1.5rem;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.7rem 1.6rem;
            border-radius: 100px;
            transition: all var(--transition);
            border: 2px solid transparent;
            text-decoration: none;
            line-height: 1.4;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover,
        .btn-primary:focus-visible {
            background: var(--primary-light);
            border-color: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-secondary {
            background: var(--secondary);
            color: var(--text-dark);
            border-color: var(--secondary);
        }
        .btn-secondary:hover,
        .btn-secondary:focus-visible {
            background: var(--secondary-light);
            border-color: var(--secondary-light);
            color: var(--text-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover,
        .btn-outline:focus-visible {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            border-color: #fff;
        }
        .btn-white:hover,
        .btn-white:focus-visible {
            background: var(--bg-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-lg {
            padding: 0.9rem 2.2rem;
            font-size: 1.05rem;
        }
        .btn-sm {
            padding: 0.45rem 1.1rem;
            font-size: 0.85rem;
        }
        .btn-block {
            width: 100%;
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.25rem 0.8rem;
            border-radius: 100px;
            background: var(--bg-light);
            color: var(--text-light);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .badge-primary {
            background: rgba(26, 75, 143, 0.1);
            color: var(--primary);
            border-color: transparent;
        }
        .badge-accent {
            background: rgba(26, 158, 143, 0.1);
            color: var(--accent);
            border-color: transparent;
        }
        .badge-warning {
            background: rgba(240, 180, 41, 0.15);
            color: #b8860b;
            border-color: transparent;
        }
        .badge i {
            font-size: 0.6rem;
        }

        /* ===== Card ===== */
        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            padding: 1.8rem 1.5rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--border);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(26, 75, 143, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary);
            margin-bottom: 1rem;
            transition: background var(--transition);
        }
        .card:hover .card-icon {
            background: rgba(26, 75, 143, 0.14);
        }
        .card h3,
        .card h4 {
            margin-bottom: 0.5rem;
        }
        .card p {
            font-size: 0.92rem;
            color: var(--text-light);
            margin-bottom: 0;
        }
        .card-cover {
            padding: 0;
            overflow: hidden;
            border-radius: var(--radius-md);
        }
        .card-cover img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            border-radius: var(--radius-md) var(--radius-md) 0 0;
        }
        .card-cover .card-body {
            padding: 1.5rem 1.5rem 1.8rem;
        }
        .card-cover .card-body h3 {
            margin-bottom: 0.4rem;
        }
        .card-cover .card-body p {
            font-size: 0.92rem;
            color: var(--text-light);
        }
        .card-link {
            text-decoration: none;
            color: inherit;
            display: block;
        }
        .card-link:hover {
            color: inherit;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 0.55rem;
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--primary-dark);
            text-decoration: none;
            letter-spacing: -0.02em;
            white-space: nowrap;
        }
        .logo i {
            font-size: 1.3rem;
            color: var(--primary);
        }
        .logo:hover {
            color: var(--primary);
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.45rem 1rem;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-body);
            text-decoration: none;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-list a i {
            font-size: 0.8rem;
            opacity: 0.7;
        }
        .nav-list a:hover {
            background: var(--bg-light);
            color: var(--primary);
        }
        .nav-list a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-list a.active i {
            opacity: 1;
        }
        .nav-list a.nav-cta {
            background: var(--secondary);
            color: var(--text-dark);
            font-weight: 600;
            padding: 0.45rem 1.2rem;
            margin-left: 0.5rem;
        }
        .nav-list a.nav-cta:hover {
            background: var(--secondary-light);
            transform: translateY(-1px);
        }
        .nav-toggle {
            display: none;
            font-size: 1.3rem;
            color: var(--text-dark);
            padding: 0.4rem 0.6rem;
            border-radius: var(--radius-sm);
            background: var(--bg-light);
            border: 1px solid var(--border-light);
            cursor: pointer;
        }
        .nav-toggle:hover {
            background: var(--border-light);
        }

        /* ===== Hero / Banner ===== */
        .hero-slim {
            position: relative;
            padding: 4rem 0 3.5rem;
            background: var(--bg-dark);
            background-image: linear-gradient(135deg, var(--bg-dark) 0%, #0f2640 100%);
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .hero-slim::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.18;
            pointer-events: none;
        }
        .hero-slim .container {
            position: relative;
            z-index: 2;
        }
        .hero-slim h1 {
            color: #fff;
            margin-bottom: 0.75rem;
            font-weight: 800;
        }
        .hero-slim .hero-desc {
            color: rgba(255, 255, 255, 0.78);
            font-size: 1.1rem;
            max-width: 680px;
            margin-bottom: 1.5rem;
        }
        .hero-slim .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem 1.5rem;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
        }
        .hero-slim .hero-meta i {
            margin-right: 0.4rem;
            color: var(--secondary);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem 0.6rem;
            font-size: 0.85rem;
            color: var(--text-light);
            padding: 1rem 0 0;
        }
        .breadcrumb a {
            color: var(--text-light);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text-body);
            font-weight: 500;
        }
        .breadcrumb i {
            font-size: 0.6rem;
            opacity: 0.5;
        }

        /* ===== Section Spacing ===== */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background: var(--bg-light);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark .section-title {
            color: #fff;
        }
        .section-dark .section-sub {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== Compare / Feature Blocks ===== */
        .compare-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.2rem;
        }
        .compare-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 1.5rem 1.2rem;
            text-align: center;
            transition: all var(--transition);
        }
        .compare-item:hover {
            box-shadow: var(--shadow-sm);
            border-color: var(--border);
        }
        .compare-item .icon-lg {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 0.6rem;
        }
        .compare-item h4 {
            font-size: 1rem;
            margin-bottom: 0.3rem;
        }
        .compare-item p {
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 0;
        }
        .compare-item .badge {
            margin-top: 0.6rem;
        }

        /* ===== Steps / Timeline ===== */
        .steps-list {
            display: grid;
            gap: 1.8rem;
            counter-reset: step-counter;
        }
        .step-item {
            display: flex;
            gap: 1.2rem;
            align-items: flex-start;
            counter-increment: step-counter;
        }
        .step-number {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
        }
        .step-item .step-content h4 {
            margin-bottom: 0.25rem;
        }
        .step-item .step-content p {
            font-size: 0.92rem;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: grid;
            gap: 0.8rem;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.2rem 1.5rem;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            background: transparent;
            text-align: left;
            cursor: pointer;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-light);
        }
        .faq-question i {
            font-size: 0.85rem;
            color: var(--text-light);
            transition: transform 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 0.35s ease;
            padding: 0 1.5rem;
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 1.5rem 1.2rem;
        }

        /* ===== CTA ===== */
        .cta-section {
            text-align: center;
            padding: 4.5rem 0;
        }
        .cta-section h2 {
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            max-width: 560px;
            margin: 0 auto 2rem;
            color: var(--text-light);
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 3.5rem 0 1.5rem;
            margin-top: auto;
        }
        .site-footer .logo {
            color: #fff;
            margin-bottom: 0.8rem;
        }
        .site-footer .logo i {
            color: var(--secondary);
        }
        .site-footer .logo:hover {
            color: var(--secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 1.5rem;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            max-width: 360px;
            margin-bottom: 0;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 1rem;
            letter-spacing: 0.02em;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.85rem;
            padding: 0.3rem 0;
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-social {
            display: flex;
            gap: 0.8rem;
        }
        .footer-social a {
            color: rgba(255, 255, 255, 0.4);
            font-size: 1.1rem;
            transition: color var(--transition);
        }
        .footer-social a:hover {
            color: var(--secondary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .hero-slim {
                padding: 3rem 0 2.5rem;
                min-height: 220px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 3rem;
                --header-height: 62px;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                border-bottom: 1px solid var(--border-light);
                padding: 1rem 1.5rem;
                gap: 0.25rem;
                box-shadow: var(--shadow-lg);
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list a {
                padding: 0.7rem 1rem;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .nav-list a.nav-cta {
                margin-left: 0;
                margin-top: 0.25rem;
            }
            .nav-toggle {
                display: block;
            }
            .hero-slim h1 {
                font-size: 1.6rem;
            }
            .hero-slim .hero-desc {
                font-size: 0.95rem;
            }
            .section {
                padding: var(--spacing-section) 0;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .compare-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section {
                padding: 3rem 0;
            }
            .faq-question {
                padding: 1rem 1.2rem;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 1.2rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 1.2rem 1rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            .hero-slim {
                padding: 2rem 0 1.8rem;
                min-height: 180px;
            }
            .hero-slim h1 {
                font-size: 1.35rem;
            }
            .compare-grid {
                grid-template-columns: 1fr;
            }
            .btn-lg {
                padding: 0.7rem 1.6rem;
                font-size: 0.9rem;
            }
            .card {
                padding: 1.3rem 1.1rem;
            }
            .step-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 0.6rem;
            }
            .step-number {
                width: 36px;
                height: 36px;
                font-size: 0.9rem;
            }
            .cta-actions {
                flex-direction: column;
                align-items: center;
            }
            .cta-actions .btn {
                width: 100%;
                max-width: 280px;
            }
        }