/* roulang page: index */
:root {
            --color-primary: #0b1d3a;
            --color-primary-light: #132d5e;
            --color-accent: #0066ff;
            --color-accent-hover: #0052cc;
            --color-accent-light: #e8f0fe;
            --color-highlight: #00b4d8;
            --color-surface: #ffffff;
            --color-bg: #f6f8fb;
            --color-bg-alt: #eef1f7;
            --color-bg-dark: #0b1d3a;
            --color-text: #1a1d28;
            --color-text-secondary: #5a6072;
            --color-text-muted: #8b909f;
            --color-text-light: #bcc0cc;
            --color-border: #e2e5ed;
            --color-border-light: #edf0f5;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --color-white: #ffffff;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-2xl: 24px;
            --shadow-xs: 0 1px 2px rgba(11, 29, 58, 0.04);
            --shadow-sm: 0 2px 8px rgba(11, 29, 58, 0.06);
            --shadow-md: 0 4px 16px rgba(11, 29, 58, 0.08);
            --shadow-lg: 0 8px 32px rgba(11, 29, 58, 0.10);
            --shadow-xl: 0 16px 48px rgba(11, 29, 58, 0.12);
            --shadow-card-hover: 0 12px 40px rgba(11, 29, 58, 0.14);
            --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --max-width: 1280px;
            --nav-height: 72px;
            --section-gap: 88px;
            --section-gap-sm: 56px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.65;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

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

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

        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 32px;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--color-border-light);
            transition: box-shadow var(--transition-base);
            height: var(--nav-height);
        }

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

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
            gap: 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-highlight) 100%);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-white);
            font-weight: 900;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-list a {
            display: inline-flex;
            align-items: center;
            padding: 10px 18px;
            border-radius: var(--radius-md);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--color-text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-list a:hover {
            color: var(--color-accent);
            background: var(--color-accent-light);
        }

        .nav-list a.active {
            color: var(--color-accent);
            font-weight: 600;
            background: var(--color-accent-light);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 11px 24px;
            background: var(--color-accent);
            color: var(--color-white) !important;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-base);
            white-space: nowrap;
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(0, 102, 255, 0.25);
        }

        .nav-cta:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 4px 16px rgba(0, 102, 255, 0.35);
            transform: translateY(-1px);
            color: var(--color-white) !important;
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            z-index: 1001;
        }

        .mobile-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--color-text);
            border-radius: 3px;
            transition: all var(--transition-base);
        }

        .mobile-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ========== HERO ========== */
        .hero {
            position: relative;
            background: var(--color-primary);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            min-height: 620px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 29, 58, 0.88) 0%, rgba(11, 29, 58, 0.72) 40%, rgba(0, 102, 255, 0.35) 100%);
            z-index: 1;
        }

        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            padding-top: 40px;
            padding-bottom: 40px;
        }

        .hero-content {
            color: var(--color-white);
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 50px;
            padding: 8px 18px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 24px;
            letter-spacing: 0.02em;
            backdrop-filter: blur(8px);
        }

        .hero-badge .dot {
            width: 8px;
            height: 8px;
            background: var(--color-highlight);
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                box-shadow: 0 0 0 0 rgba(0, 180, 216, 0.6);
            }
            50% {
                opacity: 0.7;
                box-shadow: 0 0 0 10px rgba(0, 180, 216, 0);
            }
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 900;
            line-height: 1.18;
            letter-spacing: -0.03em;
            margin-bottom: 20px;
        }

        .hero-title .highlight {
            background: linear-gradient(135deg, var(--color-highlight) 0%, #60d5f0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.1rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.78);
            margin-bottom: 32px;
            max-width: 520px;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-base);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .btn-primary {
            background: var(--color-accent);
            color: var(--color-white);
            box-shadow: 0 4px 16px rgba(0, 102, 255, 0.3);
        }

        .btn-primary:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 6px 24px rgba(0, 102, 255, 0.4);
            transform: translateY(-2px);
            color: var(--color-white);
        }

        .btn-outline-light {
            background: transparent;
            color: var(--color-white);
            border: 1.5px solid rgba(255, 255, 255, 0.4);
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.7);
            transform: translateY(-2px);
            color: var(--color-white);
        }

        .btn-outline {
            background: transparent;
            color: var(--color-accent);
            border: 1.5px solid var(--color-accent);
        }

        .btn-outline:hover {
            background: var(--color-accent-light);
            transform: translateY(-2px);
            color: var(--color-accent);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 0.85rem;
            border-radius: var(--radius-sm);
        }

        .hero-visual {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hero-card-stack {
            position: relative;
            width: 100%;
            max-width: 440px;
        }

        .hero-floating-card {
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.14);
            border-radius: var(--radius-lg);
            padding: 28px;
            position: relative;
            z-index: 2;
        }

        .hero-floating-card .stat-row {
            display: flex;
            gap: 24px;
            margin-bottom: 20px;
        }

        .hero-floating-card .stat-item {
            text-align: center;
        }

        .hero-floating-card .stat-num {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--color-highlight);
            line-height: 1;
        }

        .hero-floating-card .stat-label {
            font-size: 0.78rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 4px;
        }

        .hero-floating-card .chip-strip {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .hero-floating-card .chip {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50px;
            padding: 6px 14px;
            font-size: 0.78rem;
            color: rgba(255, 255, 255, 0.85);
            font-weight: 500;
        }

        .hero-float-behind {
            position: absolute;
            top: -24px;
            right: -30px;
            width: 180px;
            height: 180px;
            background: radial-gradient(circle, rgba(0, 180, 216, 0.25) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 1;
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: var(--section-gap) 0;
        }

        .section-sm {
            padding: var(--section-gap-sm) 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }

        .section-label {
            display: inline-block;
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--color-accent);
            background: var(--color-accent-light);
            padding: 6px 16px;
            border-radius: 50px;
            margin-bottom: 14px;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: -0.02em;
            line-height: 1.25;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-secondary);
            margin-top: 12px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ========== ADVANTAGES GRID ========== */
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .advantage-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-slow);
            position: relative;
            overflow: hidden;
        }

        .advantage-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-highlight) 100%);
            opacity: 0;
            transition: opacity var(--transition-base);
        }

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

        .advantage-card:hover::before {
            opacity: 1;
        }

        .advantage-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: var(--color-accent-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--color-accent);
            margin-bottom: 20px;
        }

        .advantage-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--color-text);
        }

        .advantage-card p {
            font-size: 0.92rem;
            color: var(--color-text-secondary);
            line-height: 1.65;
        }

        /* ========== CATEGORY SECTION ========== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .category-card {
            background: var(--color-surface);
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-slow);
            display: flex;
            flex-direction: column;
        }

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

        .category-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--color-bg-alt);
        }

        .category-card-body {
            padding: 24px 28px 28px;
        }

        .category-card-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .category-card-body p {
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            margin-bottom: 16px;
            line-height: 1.6;
        }

        .category-card-body .btn {
            font-size: 0.88rem;
        }

        /* ========== STATS STRIP ========== */
        .stats-strip {
            background: var(--color-primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .stats-strip::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(11, 29, 58, 0.9);
            z-index: 1;
        }

        .stats-strip .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
            padding-top: 60px;
            padding-bottom: 60px;
        }

        .stat-block .stat-number {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--color-highlight);
            line-height: 1;
            margin-bottom: 8px;
        }

        .stat-block .stat-unit {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--color-highlight);
        }

        .stat-block .stat-desc {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
            margin-top: 6px;
        }

        /* ========== NEWS LIST ========== */
        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .news-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-slow);
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

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

        .news-card-thumb {
            width: 100px;
            height: 80px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--color-bg-alt);
        }

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

        .news-card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--color-accent);
            background: var(--color-accent-light);
            padding: 3px 10px;
            border-radius: 50px;
            margin-bottom: 8px;
        }

        .news-card-info h3 {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 6px;
            color: var(--color-text);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-card-info h3 a:hover {
            color: var(--color-accent);
        }

        .news-card-meta {
            font-size: 0.82rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .news-card-excerpt {
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            line-height: 1.5;
            margin-top: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px;
            color: var(--color-text-muted);
            font-size: 1rem;
        }

        /* ========== PROCESS ========== */
        .process-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .process-item {
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .process-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--color-accent);
            color: var(--color-white);
            font-weight: 900;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 16px rgba(0, 102, 255, 0.3);
        }

        .process-item h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--color-text);
        }

        .process-item p {
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            line-height: 1.5;
        }

        .process-connector {
            position: absolute;
            top: 28px;
            left: calc(25% + 12px);
            width: calc(50% - 24px);
            height: 2px;
            background: linear-gradient(90deg, var(--color-accent), var(--color-border));
            z-index: 1;
            opacity: 0.4;
        }

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

        .faq-item {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-light);
            overflow: hidden;
            transition: all var(--transition-base);
        }

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

        .faq-question {
            width: 100%;
            padding: 20px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            font-size: 1rem;
            color: var(--color-text);
            text-align: left;
            gap: 16px;
            cursor: pointer;
            transition: color var(--transition-fast);
        }

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

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--color-bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            color: var(--color-text-muted);
            transition: all var(--transition-base);
        }

        .faq-item.open .faq-icon {
            background: var(--color-accent);
            color: var(--color-white);
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 0 28px 20px;
            font-size: 0.92rem;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: var(--color-primary);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            position: relative;
            text-align: center;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 29, 58, 0.92) 0%, rgba(0, 102, 255, 0.55) 100%);
            z-index: 1;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
            padding-top: 72px;
            padding-bottom: 72px;
        }

        .cta-section .section-title {
            color: var(--color-white);
            font-size: 2rem;
        }

        .cta-section .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

        .cta-buttons {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
            margin-top: 28px;
        }

        .btn-light {
            background: var(--color-white);
            color: var(--color-primary);
            font-weight: 700;
        }

        .btn-light:hover {
            background: #e8edf6;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            color: var(--color-primary);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 32px;
        }

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

        .footer-brand .logo-link {
            color: var(--color-white);
            font-size: 1.3rem;
            margin-bottom: 14px;
            display: inline-flex;
        }

        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 280px;
        }

        .footer-col h4 {
            color: var(--color-white);
            font-size: 0.9rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.55);
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }

        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }

        .footer-bottom-links a {
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.82rem;
            transition: color var(--transition-fast);
        }

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

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            :root {
                --section-gap: 64px;
                --section-gap-sm: 44px;
            }
            .hero .container {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-desc {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-visual {
                display: none;
            }
            .hero {
                min-height: 500px;
            }
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-strip .container {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
            .news-list {
                grid-template-columns: 1fr;
            }
            .process-list {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .process-connector {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .hero-title {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-height: 64px;
                --section-gap: 52px;
                --section-gap-sm: 36px;
            }
            .container {
                padding: 0 20px;
            }
            .nav-list {
                position: fixed;
                top: 0;
                right: -100%;
                width: 280px;
                height: 100vh;
                background: var(--color-surface);
                flex-direction: column;
                padding: 88px 24px 32px;
                gap: 4px;
                box-shadow: var(--shadow-xl);
                transition: right var(--transition-slow);
                z-index: 999;
            }
            .nav-list.open {
                right: 0;
            }
            .nav-list a {
                width: 100%;
                padding: 14px 18px;
                font-size: 1rem;
            }
            .mobile-toggle {
                display: flex;
            }
            .nav-cta {
                font-size: 0.88rem;
                padding: 10px 18px;
            }
            .advantages-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .stats-strip .container {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .stat-block .stat-number {
                font-size: 2.2rem;
            }
            .process-list {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .hero {
                min-height: 440px;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .category-card-img {
                height: 160px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero {
                min-height: 380px;
            }
            .hero-title {
                font-size: 1.5rem;
            }
            .hero-desc {
                font-size: 0.9rem;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 10px;
            }
            .btn {
                width: 100%;
                justify-content: center;
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            .stats-strip .container {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
                padding-top: 40px;
                padding-bottom: 40px;
            }
            .stat-block .stat-number {
                font-size: 1.8rem;
            }
            .process-list {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .news-card {
                flex-direction: column;
                gap: 14px;
            }
            .news-card-thumb {
                width: 100%;
                height: 140px;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .cta-section .container {
                padding-top: 48px;
                padding-bottom: 48px;
            }
            .cta-section .section-title {
                font-size: 1.4rem;
            }
        }

        /* ========== MOBILE OVERLAY ========== */
        .nav-overlay {
            position: fixed;
            inset: 0;
            background: rgba(11, 29, 58, 0.5);
            z-index: 998;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-base);
        }
        .nav-overlay.show {
            opacity: 1;
            pointer-events: auto;
        }

        /* ========== UTILITY ========== */
        .text-center {
            text-align: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: category1 */
:root {
            --primary: #0f3cd9;
            --primary-dark: #0a2ea8;
            --primary-light: #e8edff;
            --primary-glow: rgba(15, 60, 217, 0.18);
            --accent: #00c9a7;
            --accent-dark: #00a388;
            --accent-light: #e6faf6;
            --surface: #ffffff;
            --surface-alt: #f7f8fb;
            --surface-dark: #0b1120;
            --surface-panel: #f0f2f8;
            --text: #1a1d28;
            --text-secondary: #5a5f72;
            --text-muted: #8b8fa3;
            --text-on-dark: #e8eaef;
            --border: #e2e5ef;
            --border-light: #eef0f6;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-2xl: 24px;
            --shadow-xs: 0 1px 2px rgba(10, 14, 26, 0.04);
            --shadow-sm: 0 2px 8px rgba(10, 14, 26, 0.06);
            --shadow: 0 4px 20px rgba(10, 14, 26, 0.08);
            --shadow-lg: 0 8px 36px rgba(10, 14, 26, 0.12);
            --shadow-xl: 0 16px 48px rgba(10, 14, 26, 0.16);
            --shadow-glow: 0 0 0 4px var(--primary-glow);
            --transition-fast: 0.15s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --max-width: 1200px;
            --nav-height: 68px;
            --section-gap: 72px;
            --section-gap-sm: 48px;
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--surface);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            outline: none;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition);
        }

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

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text);
            letter-spacing: -0.02em;
            white-space: nowrap;
        }

        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            font-weight: 900;
            font-size: 1.1rem;
            border-radius: var(--radius-sm);
            letter-spacing: 0;
            flex-shrink: 0;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-list a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .nav-list a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 700;
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            background: var(--primary);
            color: #fff !important;
            border-radius: var(--radius);
            font-weight: 700;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .nav-cta:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-glow);
            color: #fff !important;
            transform: translateY(-1px);
        }

        .nav-cta i {
            font-size: 0.85rem;
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text);
            padding: 8px;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-menu-toggle:hover {
            background: var(--surface-alt);
        }

        /* Page Banner */
        .page-banner {
            position: relative;
            padding: 56px 0 48px;
            background: var(--surface-dark);
            overflow: hidden;
            min-height: 220px;
            display: flex;
            align-items: center;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.35;
            z-index: 0;
        }

        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 17, 32, 0.85) 0%, rgba(11, 17, 32, 0.6) 100%);
            z-index: 1;
        }

        .page-banner .container {
            position: relative;
            z-index: 2;
        }

        .banner-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: var(--text-on-dark);
            opacity: 0.75;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .banner-breadcrumb a {
            color: var(--accent);
            opacity: 1;
            transition: opacity var(--transition-fast);
        }

        .banner-breadcrumb a:hover {
            opacity: 0.8;
        }

        .banner-breadcrumb .separator {
            font-size: 0.7rem;
            opacity: 0.5;
        }

        .page-banner h1 {
            font-size: 2.4rem;
            font-weight: 900;
            color: #ffffff;
            letter-spacing: -0.03em;
            line-height: 1.25;
        }

        .page-banner .banner-subtitle {
            font-size: 1.05rem;
            color: var(--text-on-dark);
            opacity: 0.8;
            margin-top: 8px;
            max-width: 600px;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            padding: var(--section-gap) 0;
        }

        /* Category Intro */
        .category-intro {
            margin-bottom: var(--section-gap);
        }

        .category-intro .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--primary);
            background: var(--primary-light);
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }

        .category-intro h2 {
            font-size: 1.75rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            color: var(--text);
        }

        .category-intro .intro-text {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }

        /* Product Grid */
        .product-grid-section {
            margin-bottom: var(--section-gap);
        }

        .product-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .product-card {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            position: relative;
        }

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

        .product-card-image {
            position: relative;
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--surface-alt);
            flex-shrink: 0;
        }

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

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

        .product-card-badge {
            position: absolute;
            top: 14px;
            left: 14px;
            background: var(--primary);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 5px 12px;
            border-radius: 20px;
            letter-spacing: 0.03em;
            z-index: 2;
        }

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

        .product-card-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.01em;
            color: var(--text);
        }

        .product-card-body .product-desc {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.65;
            flex: 1;
            margin-bottom: 14px;
        }

        .product-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 16px;
        }

        .product-tag {
            font-size: 0.78rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 6px;
            background: var(--surface-panel);
            color: var(--text-secondary);
            letter-spacing: 0.02em;
        }

        .product-tag.highlight {
            background: var(--accent-light);
            color: var(--accent-dark);
        }

        .btn-card {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--primary);
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
            transition: all var(--transition-fast);
            align-self: flex-start;
        }

        .btn-card:hover {
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-sm);
        }

        /* Specs Panel */
        .specs-section {
            margin-bottom: var(--section-gap);
            background: var(--surface-dark);
            border-radius: var(--radius-2xl);
            padding: 48px 40px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .specs-section::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }

        .specs-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 280px;
            height: 280px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.02);
            pointer-events: none;
        }

        .specs-section .container {
            position: relative;
            z-index: 1;
        }

        .specs-section .section-label-alt {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--accent);
            background: rgba(0, 201, 167, 0.12);
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }

        .specs-section h2 {
            font-size: 1.65rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 28px;
            color: #fff;
        }

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

        .spec-card {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            text-align: center;
            transition: all var(--transition);
        }

        .spec-card:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }

        .spec-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 1.3rem;
            background: rgba(255, 255, 255, 0.1);
            color: var(--accent);
        }

        .spec-value {
            font-size: 1.8rem;
            font-weight: 900;
            letter-spacing: -0.02em;
            color: #fff;
            margin-bottom: 4px;
        }

        .spec-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            font-weight: 500;
        }

        /* Flow Section */
        .flow-section {
            margin-bottom: var(--section-gap);
        }

        .flow-section .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--primary);
            background: var(--primary-light);
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }

        .flow-section h2 {
            font-size: 1.65rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 28px;
            color: var(--text);
        }

        .flow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .flow-step {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 28px 20px;
            text-align: center;
            position: relative;
            transition: all var(--transition);
        }

        .flow-step:hover {
            box-shadow: var(--shadow);
            border-color: var(--border);
            transform: translateY(-2px);
        }

        .flow-step-num {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 800;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
        }

        .flow-step h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text);
        }

        .flow-step p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .flow-connector {
            display: none;
        }

        /* FAQ */
        .faq-section {
            margin-bottom: var(--section-gap);
            background: var(--surface-alt);
            border-radius: var(--radius-2xl);
            padding: 48px 40px;
        }

        .faq-section .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--primary);
            background: var(--primary-light);
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }

        .faq-section h2 {
            font-size: 1.65rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 28px;
            color: var(--text);
        }

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

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
        }

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

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            background: none;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text);
            text-align: left;
            cursor: pointer;
            transition: color var(--transition-fast);
        }

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

        .faq-question i {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: transform var(--transition);
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 0 22px 18px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* CTA Section */
        .cta-section {
            margin-bottom: var(--section-gap);
            background: var(--surface-dark);
            border-radius: var(--radius-2xl);
            padding: 56px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.2;
            z-index: 0;
        }

        .cta-section .container {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 900;
            color: #fff;
            letter-spacing: -0.03em;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto 24px;
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: var(--accent);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius);
            transition: all var(--transition-fast);
            letter-spacing: 0.01em;
        }

        .btn-cta:hover {
            background: var(--accent-dark);
            box-shadow: 0 0 0 6px rgba(0, 201, 167, 0.2);
            transform: translateY(-2px);
        }

        .btn-cta-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: transparent;
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius);
            border: 2px solid rgba(255, 255, 255, 0.3);
            transition: all var(--transition-fast);
            letter-spacing: 0.01em;
            margin-left: 12px;
        }

        .btn-cta-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }

        /* Footer */
        .site-footer {
            background: var(--surface-dark);
            color: var(--text-on-dark);
            padding: 48px 0 24px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 32px;
        }

        .footer-brand .logo-link {
            color: #fff;
            font-size: 1.2rem;
            margin-bottom: 12px;
            display: inline-flex;
        }

        .footer-brand .logo-link .logo-icon {
            background: var(--accent);
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 14px;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-bottom-links a {
            color: rgba(255, 255, 255, 0.45);
            transition: color var(--transition-fast);
        }

        .footer-bottom-links a:hover {
            color: #fff;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .product-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }

            .specs-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }

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

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }

            .page-banner h1 {
                font-size: 2rem;
            }

            .specs-section {
                padding: 36px 28px;
            }

            .faq-section {
                padding: 36px 28px;
            }

            .cta-section {
                padding: 40px 28px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
                --section-gap-sm: 36px;
            }

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

            .nav-list {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-lg);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all var(--transition);
                z-index: 999;
            }

            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }

            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }

            .nav-cta {
                display: none;
            }

            .nav-cta-mobile {
                display: inline-flex;
                width: 100%;
                justify-content: center;
                margin-top: 8px;
            }

            .product-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .specs-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }

            .spec-value {
                font-size: 1.4rem;
            }

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

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

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }

            .page-banner {
                padding: 40px 0 36px;
                min-height: 180px;
            }

            .page-banner h1 {
                font-size: 1.7rem;
            }

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

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

            .cta-section {
                padding: 36px 20px;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }

            .btn-cta-outline {
                margin-left: 0;
                margin-top: 10px;
            }

            .cta-buttons {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
        }

        @media (max-width: 520px) {
            .specs-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .flow-steps {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .page-banner h1 {
                font-size: 1.45rem;
            }

            .product-card-body {
                padding: 16px;
            }

            .product-card-body h3 {
                font-size: 1.05rem;
            }

            .specs-section h2,
            .faq-section h2,
            .flow-section h2,
            .category-intro h2 {
                font-size: 1.35rem;
            }
        }

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

        .nav-list a:focus-visible {
            outline-offset: -1px;
        }

/* roulang page: article */
:root {
            --primary: #1a56db;
            --primary-hover: #1e40af;
            --primary-light: #dbeafe;
            --secondary: #3b82f6;
            --accent: #f59e0b;
            --accent-hover: #d97706;
            --success: #10b981;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-slate: #1e293b;
            --text-heading: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --text-on-dark: #e2e8f0;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 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: 0 4px 16px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.04);
            --shadow-md: 0 8px 30px rgba(0,0,0,0.08), 0 3px 10px rgba(0,0,0,0.05);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.10), 0 6px 16px rgba(0,0,0,0.06);
            --transition: 0.2s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
            --max-width: 1200px;
            --content-width: 780px;
        }
        *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
        body{font-family:var(--font-sans);font-size:16px;line-height:1.7;color:var(--text-body);background:var(--bg);min-height:100vh;display:flex;flex-direction:column}
        a{text-decoration:none;color:inherit;transition:color var(--transition)}
        img{max-width:100%;height:auto;display:block}
        button,input,select,textarea{font-family:inherit;font-size:inherit}
        ul,ol{list-style:none}
        :focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

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

        /* Header & Navigation */
        .site-header{background:var(--bg-white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow-sm);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
        .header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
        .logo-link{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--text-heading);white-space:nowrap;letter-spacing:-0.01em;transition:opacity var(--transition)}
        .logo-link:hover{opacity:0.85}
        .logo-icon{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;background:var(--primary);color:#fff;border-radius:var(--radius-sm);font-size:1.1rem;font-weight:800;flex-shrink:0;letter-spacing:0}
        .nav-wrapper{display:flex;align-items:center;gap:8px}
        .nav-list{display:flex;align-items:center;gap:6px}
        .nav-list a{display:inline-flex;align-items:center;padding:10px 18px;border-radius:var(--radius-sm);font-size:0.95rem;font-weight:500;color:var(--text-body);transition:all var(--transition);white-space:nowrap;position:relative}
        .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-cta-btn{display:inline-flex;align-items:center;gap:6px;padding:11px 22px;background:var(--primary);color:#fff;border-radius:var(--radius-sm);font-weight:600;font-size:0.93rem;white-space:nowrap;transition:all var(--transition);box-shadow:0 2px 8px rgba(26,86,219,0.25);margin-left:6px;cursor:pointer;border:none}
        .nav-cta-btn:hover{background:var(--primary-hover);box-shadow:0 4px 16px rgba(26,86,219,0.35);transform:translateY(-1px);color:#fff}
        .nav-cta-btn:active{transform:translateY(0);box-shadow:0 2px 6px rgba(26,86,219,0.25)}
        .mobile-menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;background:none;border:none;z-index:101}
        .mobile-menu-toggle span{display:block;width:26px;height:2.5px;background:var(--text-heading);border-radius:3px;transition:all var(--transition)}
        .mobile-menu-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
        .mobile-menu-toggle.active span:nth-child(2){opacity:0}
        .mobile-menu-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

        /* Article Banner */
        .article-banner{position:relative;background:var(--bg-slate);background-image:url('/assets/images/backpic/back-1.png');background-size:cover;background-position:center;background-repeat:no-repeat;padding:72px 0 56px;overflow:hidden}
        .article-banner::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,23,42,0.88) 0%,rgba(15,23,42,0.72) 50%,rgba(30,64,175,0.65) 100%);z-index:1}
        .article-banner .container{position:relative;z-index:2}
        .breadcrumb{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:0.875rem;color:rgba(255,255,255,0.75);margin-bottom:20px}
        .breadcrumb a{color:rgba(255,255,255,0.85);transition:color var(--transition)}
        .breadcrumb a:hover{color:#fff}
        .breadcrumb .sep{color:rgba(255,255,255,0.45);font-size:0.7rem;user-select:none}
        .breadcrumb .current{color:rgba(255,255,255,0.6)}
        .article-banner h1{font-size:2.25rem;font-weight:800;color:#fff;line-height:1.35;letter-spacing:-0.015em;margin-bottom:16px;max-width:800px}
        .article-meta-row{display:flex;align-items:center;gap:18px;flex-wrap:wrap;color:rgba(255,255,255,0.8);font-size:0.9rem}
        .article-meta-row .meta-item{display:inline-flex;align-items:center;gap:6px}
        .meta-category{display:inline-flex;align-items:center;padding:5px 14px;background:rgba(255,255,255,0.18);border:1px solid rgba(255,255,255,0.25);border-radius:20px;font-size:0.82rem;font-weight:500;color:#fff;backdrop-filter:blur(4px);transition:all var(--transition)}
        .meta-category:hover{background:rgba(255,255,255,0.28);color:#fff}

        /* Main Layout */
        .article-main{padding:48px 0 60px;flex:1}
        .article-layout{display:grid;grid-template-columns:1fr 340px;gap:48px;align-items:start}
        .article-content-wrapper{background:var(--bg-white);border-radius:var(--radius-lg);padding:40px 44px;box-shadow:var(--shadow);border:1px solid var(--border-light)}
        .article-content{font-size:1.05rem;line-height:1.85;color:var(--text-body)}
        .article-content h2{font-size:1.5rem;font-weight:700;color:var(--text-heading);margin:36px 0 16px;padding-top:8px;line-height:1.4}
        .article-content h3{font-size:1.2rem;font-weight:600;color:var(--text-heading);margin:28px 0 12px;line-height:1.4}
        .article-content p{margin-bottom:18px}
        .article-content ul,.article-content ol{margin:12px 0 20px 24px}
        .article-content ul{list-style:disc}
        .article-content ol{list-style:decimal}
        .article-content li{margin-bottom:8px;line-height:1.75}
        .article-content img{border-radius:var(--radius);margin:24px 0;box-shadow:var(--shadow-sm);max-width:100%}
        .article-content blockquote{border-left:4px solid var(--primary);background:var(--primary-light);padding:18px 24px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:24px 0;color:var(--text-body);font-style:italic;font-size:1rem}
        .article-content code{background:#f1f5f9;padding:2px 7px;border-radius:4px;font-size:0.9em;color:#1e40af}
        .article-content pre{background:var(--bg-slate);color:#e2e8f0;padding:20px 24px;border-radius:var(--radius);overflow-x:auto;margin:20px 0;font-size:0.9rem;line-height:1.6}
        .article-content pre code{background:none;padding:0;color:inherit}
        .article-content a{color:var(--primary);text-decoration:underline;text-underline-offset:2px}
        .article-content a:hover{color:var(--primary-hover)}
        .article-content table{width:100%;border-collapse:collapse;margin:20px 0}
        .article-content th,.article-content td{border:1px solid var(--border);padding:10px 14px;text-align:left}
        .article-content th{background:var(--bg);font-weight:600;color:var(--text-heading)}
        .article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border-light)}
        .article-tags .tag{display:inline-flex;padding:6px 14px;background:var(--bg);border:1px solid var(--border);border-radius:20px;font-size:0.82rem;color:var(--text-muted);transition:all var(--transition)}
        .article-tags .tag:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary);cursor:pointer}
        .article-actions{display:flex;align-items:center;gap:12px;margin-top:32px;padding-top:20px;border-top:1px solid var(--border-light);flex-wrap:wrap}
        .btn-back{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);font-weight:500;color:var(--text-body);transition:all var(--transition);font-size:0.93rem}
        .btn-back:hover{background:var(--border-light);color:var(--text-heading);border-color:var(--text-muted)}

        /* Sidebar */
        .article-sidebar{display:flex;flex-direction:column;gap:28px;position:sticky;top:88px}
        .sidebar-card{background:var(--bg-white);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-sm);border:1px solid var(--border-light)}
        .sidebar-card h3{font-size:1.05rem;font-weight:700;color:var(--text-heading);margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--primary-light);display:flex;align-items:center;gap:8px}
        .sidebar-card h3::before{content:'';display:inline-block;width:4px;height:18px;background:var(--primary);border-radius:2px;flex-shrink:0}
        .sidebar-post-list{display:flex;flex-direction:column;gap:14px}
        .sidebar-post-item{display:flex;gap:12px;padding-bottom:14px;border-bottom:1px solid var(--border-light);transition:all var(--transition)}
        .sidebar-post-item:last-child{border-bottom:none;padding-bottom:0}
        .sidebar-post-item:hover .sidebar-post-title{color:var(--primary)}
        .sidebar-post-thumb{width:60px;height:60px;border-radius:var(--radius-sm);object-fit:cover;flex-shrink:0;background:var(--bg)}
        .sidebar-post-info{flex:1;min-width:0}
        .sidebar-post-title{font-size:0.88rem;font-weight:600;color:var(--text-heading);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color var(--transition)}
        .sidebar-post-date{font-size:0.75rem;color:var(--text-light);margin-top:4px}
        .sidebar-cta-box{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-hover) 100%);border-radius:var(--radius-lg);padding:28px 24px;color:#fff;text-align:center;box-shadow:var(--shadow-md)}
        .sidebar-cta-box h3{font-size:1.1rem;font-weight:700;margin-bottom:10px;color:#fff;border-bottom:none;padding-bottom:0}
        .sidebar-cta-box h3::before{display:none}
        .sidebar-cta-box p{font-size:0.88rem;opacity:0.9;margin-bottom:18px;line-height:1.5}
        .sidebar-cta-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 24px;background:#fff;color:var(--primary);border-radius:var(--radius-sm);font-weight:700;font-size:0.9rem;transition:all var(--transition);border:none;cursor:pointer;width:100%}
        .sidebar-cta-btn:hover{background:var(--accent);color:#fff;box-shadow:0 6px 20px rgba(245,158,11,0.35);transform:translateY(-2px)}

        /* Related Posts Section */
        .related-section{padding:0 0 56px}
        .related-section .section-label{font-size:0.82rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--primary);margin-bottom:8px}
        .related-section h2{font-size:1.6rem;font-weight:800;color:var(--text-heading);margin-bottom:28px}
        .related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
        .related-card{background:var(--bg-white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--border-light);transition:all var(--transition);display:flex;flex-direction:column}
        .related-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);border-color:var(--primary-light)}
        .related-card-img{width:100%;height:180px;object-fit:cover;background:var(--bg)}
        .related-card-body{padding:20px;flex:1;display:flex;flex-direction:column}
        .related-card-category{font-size:0.75rem;font-weight:600;color:var(--primary);text-transform:uppercase;letter-spacing:0.04em;margin-bottom:8px}
        .related-card-title{font-size:1rem;font-weight:700;color:var(--text-heading);line-height:1.45;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color var(--transition)}
        .related-card:hover .related-card-title{color:var(--primary)}
        .related-card-desc{font-size:0.85rem;color:var(--text-muted);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:12px;flex:1}
        .related-card-date{font-size:0.78rem;color:var(--text-light)}

        /* Not Found */
        .not-found-state{text-align:center;padding:80px 24px}
        .not-found-state .icon-circle{display:inline-flex;align-items:center;justify-content:center;width:80px;height:80px;background:var(--primary-light);border-radius:50%;margin-bottom:24px;font-size:2rem;color:var(--primary)}
        .not-found-state h2{font-size:1.5rem;font-weight:700;color:var(--text-heading);margin-bottom:12px}
        .not-found-state p{color:var(--text-muted);margin-bottom:24px;font-size:1rem}
        .btn-primary{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;background:var(--primary);color:#fff;border-radius:var(--radius-sm);font-weight:600;font-size:0.95rem;transition:all var(--transition);border:none;cursor:pointer;box-shadow:0 3px 12px rgba(26,86,219,0.25)}
        .btn-primary:hover{background:var(--primary-hover);box-shadow:0 6px 20px rgba(26,86,219,0.35);transform:translateY(-2px);color:#fff}
        .btn-primary:active{transform:translateY(0)}

        /* Footer */
        .site-footer{background:var(--bg-slate);color:var(--text-on-dark);padding:56px 0 28px;margin-top:auto}
        .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;margin-bottom:36px}
        .footer-brand .logo-link{font-size:1.3rem;color:#fff;margin-bottom:14px;display:inline-flex}
        .footer-brand .logo-icon{background:var(--primary)}
        .footer-brand p{font-size:0.9rem;color:#94a3b8;line-height:1.7;margin-top:8px;max-width:300px}
        .footer-col h4{font-size:0.95rem;font-weight:700;color:#fff;margin-bottom:16px;letter-spacing:0.02em}
        .footer-col ul{display:flex;flex-direction:column;gap:10px}
        .footer-col ul li a{color:#94a3b8;font-size:0.88rem;transition:color var(--transition)}
        .footer-col ul li a:hover{color:#fff}
        .footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:22px;border-top:1px solid rgba(255,255,255,0.1);font-size:0.82rem;color:#64748b;flex-wrap:wrap;gap:10px}
        .footer-bottom-links{display:flex;gap:18px}
        .footer-bottom-links a{color:#64748b;font-size:0.82rem;transition:color var(--transition)}
        .footer-bottom-links a:hover{color:#fff}

        /* Responsive */
        @media (max-width:1024px){
            .article-layout{grid-template-columns:1fr;gap:32px}
            .article-sidebar{position:static;display:grid;grid-template-columns:1fr 1fr;gap:20px}
            .sidebar-cta-box{grid-column:1/-1}
            .related-grid{grid-template-columns:repeat(2,1fr)}
            .article-content-wrapper{padding:32px 28px}
            .article-banner h1{font-size:1.75rem}
        }
        @media (max-width:768px){
            .header-inner{height:60px}
            .nav-wrapper{position:fixed;top:0;right:-100%;width:280px;height:100vh;background:var(--bg-white);flex-direction:column;padding:80px 24px 30px;box-shadow:var(--shadow-lg);transition:right var(--transition-slow);z-index:99;gap:12px;align-items:stretch}
            .nav-wrapper.open{right:0}
            .nav-list{flex-direction:column;gap:4px;width:100%}
            .nav-list a{padding:12px 16px;width:100%;border-radius:var(--radius-sm);font-size:0.95rem}
            .nav-cta-btn{margin-left:0;width:100%;justify-content:center;padding:13px 20px;margin-top:8px}
            .mobile-menu-toggle{display:flex}
            .mobile-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.4);z-index:98}
            .mobile-overlay.show{display:block}
            .article-banner{padding:48px 0 36px}
            .article-banner h1{font-size:1.45rem}
            .article-content-wrapper{padding:24px 18px;border-radius:var(--radius)}
            .article-content{font-size:0.98rem}
            .article-content h2{font-size:1.25rem}
            .article-content h3{font-size:1.05rem}
            .article-sidebar{grid-template-columns:1fr}
            .related-grid{grid-template-columns:1fr}
            .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
            .footer-brand{grid-column:1/-1}
            .footer-bottom{flex-direction:column;text-align:center}
        }
        @media (max-width:520px){
            .container{padding:0 16px}
            .article-banner h1{font-size:1.25rem}
            .article-banner{padding:36px 0 28px}
            .article-content-wrapper{padding:18px 14px}
            .article-content{font-size:0.93rem}
            .article-meta-row{font-size:0.8rem;gap:10px}
            .footer-grid{grid-template-columns:1fr;gap:24px}
            .related-grid{grid-template-columns:1fr}
            .breadcrumb{font-size:0.78rem}
            .article-actions{flex-direction:column;align-items:stretch}
            .btn-back{justify-content:center}
        }