/* roulang page: index */
:root {
            --color-primary: #0d2137;
            --color-primary-light: #1a3d5c;
            --color-primary-dark: #091829;
            --color-accent: #c8963e;
            --color-accent-light: #d4a855;
            --color-accent-dark: #a67c2e;
            --color-bg: #f5f6f8;
            --color-surface: #ffffff;
            --color-text: #1a1a2e;
            --color-text-weak: #5a6275;
            --color-text-muted: #8b919e;
            --color-border: #e4e7ed;
            --color-border-light: #eef0f5;
            --color-success: #2ecc71;
            --color-warning: #f39c12;
            --color-danger: #e74c3c;
            --color-info: #3498db;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
            --max-width: 1200px;
            --header-height: 68px;
            --topbar-height: 36px;
        }

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

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

        body {
            font-family: var(--font-sans);
            color: var(--color-text);
            background: var(--color-bg);
            line-height: 1.65;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul, ol {
            list-style: none;
        }

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

        /* Top Bar */
        .topbar {
            background: var(--color-primary-dark);
            color: rgba(255,255,255,0.85);
            font-size: 0.8rem;
            height: var(--topbar-height);
            line-height: var(--topbar-height);
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .topbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 100%;
        }
        .topbar-left {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .topbar-left .topbar-dot {
            width: 7px;
            height: 7px;
            background: var(--color-success);
            border-radius: 50%;
            display: inline-block;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.4; }
        }
        .topbar-right {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        .topbar-right a {
            color: rgba(255,255,255,0.8);
            font-size: 0.78rem;
            transition: color var(--transition-fast);
        }
        .topbar-right a:hover {
            color: var(--color-accent-light);
        }

        /* Header / Nav */
        .header {
            background: var(--color-surface);
            height: var(--header-height);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-xs);
            border-bottom: 1px solid var(--color-border-light);
            transition: box-shadow var(--transition-base);
        }
        .header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--color-primary);
            white-space: nowrap;
            letter-spacing: -0.01em;
        }
        .nav-logo .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-links a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--color-text-weak);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--color-primary);
            background: rgba(13,33,55,0.05);
        }
        .nav-links a.active {
            font-weight: 600;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            background: var(--color-accent);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .nav-cta:hover {
            background: var(--color-accent-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            color: var(--color-text);
            font-size: 1.35rem;
            transition: background var(--transition-fast);
        }
        .nav-toggle:hover {
            background: var(--color-border-light);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: calc(var(--topbar-height) + var(--header-height));
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--color-surface);
            z-index: 999;
            flex-direction: column;
            padding: 20px 24px;
            gap: 4px;
            overflow-y: auto;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            display: block;
            padding: 14px 16px;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 500;
            color: var(--color-text);
            transition: background var(--transition-fast);
        }
        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: rgba(13,33,55,0.06);
            color: var(--color-primary);
        }
        .mobile-menu .mobile-cta {
            margin-top: 12px;
            text-align: center;
            background: var(--color-accent);
            color: #fff;
            font-weight: 600;
            border-radius: var(--radius-md);
            padding: 14px 20px;
        }

        /* Hero */
        .hero {
            position: relative;
            min-height: 560px;
            display: flex;
            align-items: center;
            background: var(--color-primary) url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            background-blend-mode: overlay;
            color: #fff;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(160deg, rgba(13,33,55,0.88) 0%, rgba(13,33,55,0.72) 50%, rgba(9,24,41,0.9) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 22px;
            padding-top: 40px;
            padding-bottom: 40px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.12);
            border: 1px solid rgba(255,255,255,0.22);
            border-radius: 30px;
            padding: 6px 16px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.9);
            backdrop-filter: blur(6px);
        }
        .hero-badge .hot-icon {
            color: var(--color-accent-light);
            font-size: 0.9rem;
        }
        .hero h1 {
            font-size: clamp(1.8rem, 3.5vw, 2.8rem);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
            max-width: 700px;
        }
        .hero h1 .highlight {
            color: var(--color-accent-light);
            position: relative;
        }
        .hero-subtitle {
            font-size: 1.05rem;
            color: rgba(255,255,255,0.78);
            max-width: 560px;
            line-height: 1.6;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-top: 4px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 13px 26px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--color-accent);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--color-accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.45);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: rgba(255,255,255,0.7);
            color: #fff;
            transform: translateY(-2px);
        }
        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 10px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.65);
        }
        .hero-trust span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .hero-trust i {
            color: var(--color-success);
            font-size: 0.75rem;
        }

        /* Sections */
        .section {
            padding: 64px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 44px;
        }
        .section-header .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--color-accent);
            margin-bottom: 8px;
        }
        .section-header h2 {
            font-size: clamp(1.5rem, 2.8vw, 2rem);
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .section-header p {
            color: var(--color-text-weak);
            font-size: 0.98rem;
            max-width: 560px;
            margin: 0 auto;
        }

        /* Feature Cards */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .feature-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 28px 22px;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
            opacity: 0;
            transition: opacity var(--transition-base);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-card .fc-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 16px;
            background: rgba(13,33,55,0.06);
            color: var(--color-primary);
            transition: all var(--transition-base);
        }
        .feature-card:hover .fc-icon {
            background: var(--color-primary);
            color: #fff;
        }
        .feature-card h3 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--color-primary);
        }
        .feature-card p {
            font-size: 0.88rem;
            color: var(--color-text-weak);
            line-height: 1.55;
        }

        /* CMS List Section */
        .cms-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border-light);
            border-bottom: 1px solid var(--color-border-light);
        }
        .cms-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .cms-card {
            background: var(--color-bg);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            border: 1px solid var(--color-border-light);
        }
        .cms-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .cms-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }
        .cms-card-body {
            padding: 18px 16px;
        }
        .cms-card-tag {
            display: inline-block;
            font-size: 0.72rem;
            font-weight: 600;
            background: var(--color-accent);
            color: #fff;
            padding: 3px 10px;
            border-radius: 20px;
            margin-bottom: 8px;
        }
        .cms-card h4 {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 6px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .cms-card p {
            font-size: 0.82rem;
            color: var(--color-text-weak);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 10px;
        }
        .cms-card-meta {
            font-size: 0.75rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .cms-empty {
            text-align: center;
            padding: 48px 20px;
            color: var(--color-text-muted);
            font-size: 0.95rem;
            grid-column: 1 / -1;
        }
        .cms-empty i {
            font-size: 2.5rem;
            display: block;
            margin-bottom: 12px;
            opacity: 0.5;
        }

        /* Stats */
        .stats-section {
            background: var(--color-primary);
            color: #fff;
            padding: 52px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }
        .stat-item .stat-number {
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--color-accent-light);
            letter-spacing: -0.02em;
        }
        .stat-item .stat-label {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.7);
            margin-top: 4px;
        }

        /* Security */
        .security-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .security-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 24px 22px;
            border: 1px solid var(--color-border-light);
            display: flex;
            gap: 16px;
            align-items: flex-start;
            transition: all var(--transition-base);
        }
        .security-card:hover {
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .security-card .sc-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-md);
            background: rgba(13,33,55,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--color-primary);
            flex-shrink: 0;
            transition: all var(--transition-base);
        }
        .security-card:hover .sc-icon {
            background: var(--color-primary);
            color: #fff;
        }
        .security-card h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
        }
        .security-card p {
            font-size: 0.85rem;
            color: var(--color-text-weak);
            line-height: 1.5;
        }

        /* Steps */
        .steps-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            position: relative;
        }
        .step-item .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 14px;
            position: relative;
            z-index: 2;
        }
        .step-item h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 4px;
        }
        .step-item p {
            font-size: 0.84rem;
            color: var(--color-text-weak);
            line-height: 1.5;
        }
        .step-connector {
            display: none;
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border-light);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .faq-item:hover {
            border-color: var(--color-border);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 20px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--color-primary);
            gap: 12px;
            user-select: none;
        }
        .faq-question i {
            transition: transform var(--transition-base);
            color: var(--color-text-muted);
            font-size: 0.85rem;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            padding: 0 20px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }
        .faq-answer p {
            font-size: 0.88rem;
            color: var(--color-text-weak);
            line-height: 1.6;
        }

        /* CTA Banner */
        .cta-banner {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
            border-radius: var(--radius-xl);
            padding: 48px 36px;
            text-align: center;
            color: #fff;
            margin: 0 24px;
        }
        .cta-banner h2 {
            font-size: 1.7rem;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .cta-banner p {
            color: rgba(255,255,255,0.78);
            margin-bottom: 20px;
            font-size: 0.95rem;
        }
        .cta-banner .btn-primary {
            font-size: 1rem;
            padding: 14px 32px;
        }

        /* Footer */
        .footer {
            background: var(--color-primary-dark);
            color: rgba(255,255,255,0.7);
            padding: 40px 0 28px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 30px;
            margin-bottom: 28px;
        }
        .footer-brand .footer-logo {
            font-weight: 700;
            font-size: 1.15rem;
            color: #fff;
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .footer-brand p {
            font-size: 0.84rem;
            line-height: 1.55;
            color: rgba(255,255,255,0.55);
        }
        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-col a {
            display: block;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.55);
            padding: 4px 0;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--color-accent-light);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 18px;
            text-align: center;
            font-size: 0.78rem;
            color: rgba(255,255,255,0.4);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .cms-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .security-grid {
                grid-template-columns: 1fr 1fr;
            }
            .steps-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .topbar-right {
                display: none;
            }
            .topbar .container {
                justify-content: center;
            }
            .nav-links {
                display: none;
            }
            .nav-cta.desktop {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .hero {
                min-height: 440px;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .hero-subtitle {
                font-size: 0.9rem;
            }
            .hero-trust {
                gap: 12px;
                font-size: 0.78rem;
            }
            .section {
                padding: 40px 0;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .cms-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item .stat-number {
                font-size: 1.8rem;
            }
            .security-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .steps-list {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .cta-banner {
                margin: 0 12px;
                padding: 32px 20px;
            }
            .cta-banner h2 {
                font-size: 1.3rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .btn {
                padding: 11px 20px;
                font-size: 0.88rem;
            }
            .container {
                padding: 0 16px;
            }
        }
        @media (max-width: 520px) {
            .hero {
                min-height: 380px;
            }
            .hero h1 {
                font-size: 1.3rem;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .section-header h2 {
                font-size: 1.3rem;
            }
        }

/* roulang page: article */
:root {
            --primary: #1a56db;
            --primary-dark: #1040b0;
            --primary-light: #e8effd;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 40px rgba(0,0,0,0.1);
            --radius-sm: 6px;
            --radius: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --transition: 0.2s ease;
            --transition-slow: 0.35s ease;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --article-width: 820px;
        }

        *, *::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(--bg);
            min-height: 100vh;
        }

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

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

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

        /* ========== HEADER ========== */
        .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);
            box-shadow: var(--shadow-sm);
        }

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 66px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: -0.3px;
            white-space: nowrap;
            transition: opacity var(--transition);
        }
        .nav-logo:hover { opacity: 0.85; }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius);
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
        }

        .nav-links a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 10px 20px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-cta:hover {
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
            color: #fff;
        }
        .nav-cta:active { transform: translateY(0); }

        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--text);
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--border-light); }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-wrap {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            padding: 14px 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb .sep { color: var(--text-light); font-size: 0.75rem; }
        .breadcrumb .current { color: var(--text); font-weight: 500; }
        .breadcrumb .cat-tag {
            display: inline-block;
            padding: 3px 10px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        /* ========== ARTICLE HEADER ========== */
        .article-header-section {
            background: var(--bg-white);
            padding: 48px 0 40px;
            border-bottom: 1px solid var(--border-light);
        }
        .article-header-section .container-narrow { text-align: center; }

        .article-meta-top {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 20px;
            font-size: 0.88rem;
            color: var(--text-muted);
        }
        .article-meta-top .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta-top .meta-item i { color: var(--primary); font-size: 0.85rem; }

        .article-category-badge {
            display: inline-block;
            padding: 5px 14px;
            background: var(--accent-light);
            color: var(--accent-dark);
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 18px;
        }

        .article-header-section h1 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text);
            line-height: 1.35;
            letter-spacing: -0.4px;
            margin-bottom: 8px;
        }

        /* ========== ARTICLE FEATURED IMAGE ========== */
        .article-featured-image {
            margin: 32px auto 0;
            max-width: var(--article-width);
            padding: 0 24px;
        }
        .article-featured-image img {
            width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            aspect-ratio: 16 / 9;
            object-fit: cover;
        }

        /* ========== ARTICLE CONTENT ========== */
        .article-content-section {
            padding: 48px 0 60px;
            background: var(--bg-white);
        }

        .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-content h2 {
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--text);
            margin: 2em 0 0.7em;
            padding-top: 0.3em;
            letter-spacing: -0.2px;
        }
        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text);
            margin: 1.6em 0 0.6em;
            letter-spacing: -0.1px;
        }
        .article-content h4 {
            font-size: 1.1rem;
            font-weight: 650;
            color: var(--text-secondary);
            margin: 1.4em 0 0.5em;
        }
        .article-content p {
            margin-bottom: 1.2em;
            color: var(--text);
        }
        .article-content ul,
        .article-content ol {
            margin: 0.8em 0 1.4em;
            padding-left: 1.6em;
        }
        .article-content li {
            margin-bottom: 0.45em;
            color: var(--text);
        }
        .article-content li::marker { color: var(--primary); }
        .article-content blockquote {
            margin: 1.8em 0;
            padding: 20px 28px;
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            border-radius: 0 var(--radius) var(--radius) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-content blockquote p { margin-bottom: 0; color: inherit; }
        .article-content img {
            border-radius: var(--radius);
            margin: 1.6em auto;
            box-shadow: var(--shadow-md);
        }
        .article-content a {
            color: var(--primary);
            font-weight: 500;
            text-decoration: underline;
            text-underline-offset: 3px;
            transition: color var(--transition);
        }
        .article-content a:hover { color: var(--primary-dark); }
        .article-content code {
            background: var(--border-light);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--primary-dark);
            font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
        }
        .article-content pre {
            background: var(--bg-dark);
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius);
            overflow-x: auto;
            margin: 1.6em 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-content pre code {
            background: none;
            padding: 0;
            color: inherit;
            font-size: inherit;
        }
        .article-content hr {
            border: none;
            border-top: 1px solid var(--border);
            margin: 2.5em 0;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.6em 0;
            font-size: 0.95rem;
        }
        .article-content th,
        .article-content td {
            padding: 12px 16px;
            border: 1px solid var(--border);
            text-align: left;
        }
        .article-content th {
            background: var(--bg);
            font-weight: 600;
            color: var(--text);
        }

        /* ========== ARTICLE FOOTER META ========== */
        .article-footer-meta {
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .article-tags {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .article-tags span.tag {
            display: inline-block;
            padding: 5px 14px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 20px;
            font-size: 0.82rem;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .article-tags span.tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .article-share .share-btn {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.95rem;
            color: var(--text-muted);
            background: var(--bg);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .article-share .share-btn:hover {
            color: var(--primary);
            border-color: var(--primary);
            background: var(--primary-light);
        }

        /* ========== NOT FOUND ========== */
        .not-found-section {
            padding: 100px 0;
            text-align: center;
            background: var(--bg-white);
        }
        .not-found-section .icon-circle {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--primary-light);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 24px;
        }
        .not-found-section h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }
        .not-found-section p {
            color: var(--text-muted);
            margin-bottom: 28px;
            font-size: 1rem;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: var(--shadow);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ========== RELATED POSTS ========== */
        .related-section {
            padding: 56px 0 64px;
            background: var(--bg);
        }
        .related-section .section-label {
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .related-section .section-title {
            font-size: 1.55rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.3px;
            margin-bottom: 36px;
        }
        .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);
            transition: all var(--transition-slow);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .related-card img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
        }
        .related-card .card-body {
            padding: 20px 20px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-date {
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .related-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text);
            line-height: 1.45;
            margin-bottom: 12px;
            flex: 1;
        }
        .related-card .card-link {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 5px;
            transition: gap var(--transition);
        }
        .related-card .card-link:hover { gap: 9px; }

        /* ========== CTA SECTION ========== */
        .cta-section {
            padding: 70px 0;
            background: linear-gradient(160deg, var(--bg-dark) 0%, #1a2744 50%, #152040 100%);
            position: relative;
            overflow: hidden;
            text-align: center;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 320px;
            height: 320px;
            border-radius: 50%;
            background: rgba(26,86,219,0.18);
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -60px;
            width: 240px;
            height: 240px;
            border-radius: 50%;
            background: rgba(245,158,11,0.12);
            pointer-events: none;
        }
        .cta-section .container-narrow {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 1.9rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.3px;
            margin-bottom: 14px;
        }
        .cta-section p {
            font-size: 1.08rem;
            color: rgba(255,255,255,0.75);
            margin-bottom: 32px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }
        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius);
            box-shadow: 0 8px 28px rgba(245,158,11,0.35);
            transition: all var(--transition);
        }
        .cta-section .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 36px rgba(245,158,11,0.45);
            color: #fff;
        }
        .cta-section .btn-cta:active { transform: translateY(0); }

        /* ========== FOOTER ========== */
        .footer {
            background: #0c1322;
            color: #cbd5e1;
            padding: 56px 0 28px;
            font-size: 0.92rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.2px;
        }
        .footer-brand p {
            color: #94a3b8;
            line-height: 1.7;
            font-size: 0.88rem;
        }
        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            color: #94a3b8;
            padding: 5px 0;
            transition: color var(--transition);
            font-size: 0.88rem;
        }
        .footer-col a:hover { color: #fff; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 22px;
            text-align: center;
            color: #64748b;
            font-size: 0.82rem;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
            .article-header-section h1 { font-size: 1.8rem; }
        }

        @media (max-width: 768px) {
            .header .container { height: 58px; }
            .nav-links {
                display: none;
                position: absolute;
                top: 58px;
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px;
                gap: 4px;
                border-bottom: 2px solid var(--border);
                box-shadow: var(--shadow-lg);
                z-index: 999;
            }
            .nav-links.show { display: flex; }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                font-size: 0.95rem;
                border-radius: var(--radius-sm);
            }
            .nav-cta.desktop { display: none; }
            .nav-toggle { display: flex; }

            .article-header-section { padding: 32px 0 28px; }
            .article-header-section h1 { font-size: 1.5rem; }
            .article-content-section { padding: 32px 0 44px; }
            .article-content { font-size: 1rem; }
            .article-content h2 { font-size: 1.3rem; }
            .article-content h3 { font-size: 1.12rem; }

            .related-grid { grid-template-columns: 1fr; gap: 16px; }
            .related-section { padding: 40px 0 48px; }
            .related-section .section-title { font-size: 1.3rem; }

            .cta-section { padding: 48px 0; }
            .cta-section h2 { font-size: 1.45rem; }

            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer { padding: 40px 0 20px; }

            .article-footer-meta { flex-direction: column; align-items: flex-start; }
            .article-featured-image { margin-top: 20px; padding: 0 16px; }
            .breadcrumb-wrap { padding: 10px 0; }
            .breadcrumb { font-size: 0.82rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .container-narrow { padding: 0 16px; }
            .article-header-section h1 { font-size: 1.3rem; }
            .article-content { font-size: 0.95rem; line-height: 1.75; }
            .article-content blockquote { padding: 16px 20px; }
            .article-content pre { padding: 14px 16px; font-size: 0.82rem; }
            .cta-section h2 { font-size: 1.25rem; }
            .cta-section p { font-size: 0.95rem; }
            .related-card .card-body { padding: 14px 16px 18px; }
            .related-card h4 { font-size: 0.95rem; }
        }

/* roulang page: category1 */
:root {
            --primary: #1e40af;
            --primary-light: #3b82f6;
            --primary-dark: #1a3a8a;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --accent-dark: #d97706;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-deep: #0f172a;
            --bg-card: #ffffff;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
            --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
            --shadow-md: 0 8px 30px rgba(15, 23, 42, 0.10);
            --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.12);
            --shadow-xl: 0 24px 64px rgba(15, 23, 42, 0.16);
            --transition-fast: 0.18s ease;
            --transition: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
            --topbar-height: 36px;
        }

        *,
        *::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(--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,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
            background: none;
        }

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

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

        .container-narrow {
            max-width: 880px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .container-wide {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* Top Bar */
        .topbar {
            background: var(--bg-deep);
            color: #cbd5e1;
            font-size: 13px;
            height: var(--topbar-height);
            display: flex;
            align-items: center;
            z-index: 1001;
            position: relative;
        }
        .topbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .topbar-left {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .topbar-left i {
            color: var(--accent-light);
            font-size: 12px;
        }
        .topbar-right {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        .topbar-right a {
            color: #cbd5e1;
            font-size: 13px;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }
        .topbar-right a:hover {
            color: #ffffff;
        }
        .topbar-badge {
            background: var(--accent);
            color: #1e293b;
            font-size: 11px;
            padding: 2px 8px;
            border-radius: 20px;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        /* Header / Nav */
        .header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition);
        }
        .header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 20px;
            color: var(--primary);
            flex-shrink: 0;
            transition: opacity var(--transition-fast);
        }
        .nav-logo:hover {
            opacity: 0.85;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }
        .nav-links a {
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 15px;
            color: var(--text-weak);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: #f1f5f9;
        }
        .nav-links a.active {
            color: var(--primary);
            font-weight: 600;
            background: #eff6ff;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 10px 22px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 14px;
            white-space: nowrap;
            transition: all var(--transition-fast);
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(30, 64, 175, 0.25);
        }
        .nav-cta:hover {
            background: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(30, 64, 175, 0.35);
            transform: translateY(-1px);
            color: #fff;
        }
        .nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 1px 4px rgba(30, 64, 175, 0.2);
        }
        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--text);
            background: var(--border-light);
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }
        .nav-toggle:hover {
            background: var(--border);
            color: var(--primary);
        }
        .nav-toggle:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

        /* Mobile Nav Overlay */
        .nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .nav-overlay.open {
            display: block;
            opacity: 1;
        }
        .nav-mobile-panel {
            display: none;
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            max-width: 85vw;
            height: 100vh;
            background: var(--bg-white);
            z-index: 1000;
            padding: 24px 20px;
            flex-direction: column;
            gap: 8px;
            transition: right var(--transition-slow);
            box-shadow: var(--shadow-xl);
            overflow-y: auto;
        }
        .nav-mobile-panel.open {
            right: 0;
        }
        .nav-mobile-panel .nav-logo {
            margin-bottom: 12px;
        }
        .nav-mobile-panel a {
            display: block;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 16px;
            color: var(--text);
            transition: all var(--transition-fast);
        }
        .nav-mobile-panel a:hover,
        .nav-mobile-panel a.active {
            background: #eff6ff;
            color: var(--primary);
        }
        .nav-mobile-panel .nav-cta {
            margin-top: 8px;
            text-align: center;
            justify-content: center;
            display: flex;
        }
        .nav-mobile-close {
            position: absolute;
            top: 16px;
            right: 16px;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--border-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text);
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .nav-mobile-close:hover {
            background: var(--border);
            color: var(--primary);
        }

        /* Hero Section */
        .hero-section {
            position: relative;
            padding: 80px 0 90px;
            background: var(--bg-deep);
            color: #fff;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 64, 175, 0.78) 50%, rgba(15, 23, 42, 0.85) 100%);
            z-index: 1;
        }
        .hero-section .container {
            position: relative;
            z-index: 2;
        }
        .hero-content {
            max-width: 720px;
            margin: 0 auto;
            text-align: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.22);
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 500;
            color: #f1f5f9;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            color: var(--accent-light);
            font-size: 12px;
        }
        .hero-section h1 {
            font-size: clamp(32px, 4.5vw, 52px);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.01em;
            color: #ffffff;
        }
        .hero-section h1 span {
            color: var(--accent-light);
        }
        .hero-subtitle {
            font-size: 18px;
            color: #cbd5e1;
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition-fast);
            cursor: pointer;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent-light);
            outline-offset: 3px;
        }
        .btn-primary {
            background: var(--accent);
            color: #1e293b;
            box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            box-shadow: 0 6px 24px rgba(245, 158, 11, 0.45);
            transform: translateY(-2px);
            color: #1e293b;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.55);
            color: #fff;
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
            background: rgba(255, 255, 255, 0.18);
        }
        .btn-lg {
            padding: 16px 34px;
            font-size: 16px;
            border-radius: var(--radius-lg);
        }

        /* Section Common */
        .section {
            padding: 72px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-tag {
            display: inline-block;
            background: #eff6ff;
            color: var(--primary);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 12px;
        }
        .section-header h2 {
            font-size: clamp(26px, 3.2vw, 36px);
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-weak);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .section-alt {
            background: var(--bg-white);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }
        .section-deep {
            background: var(--bg-deep);
            color: #fff;
        }
        .section-deep .section-header h2 {
            color: #fff;
        }
        .section-deep .section-header p {
            color: #cbd5e1;
        }
        .section-deep .section-tag {
            background: rgba(255, 255, 255, 0.1);
            color: #f1f5f9;
        }

        /* Features Grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            opacity: 0;
            transition: opacity var(--transition);
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--border);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 18px;
            background: #eff6ff;
            color: var(--primary);
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.05);
        }
        .feature-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.7;
        }

        /* Steps / Process */
        .steps-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            max-width: 760px;
            margin: 0 auto;
            position: relative;
        }
        .steps-list::before {
            content: '';
            position: absolute;
            left: 35px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border);
            z-index: 0;
        }
        .step-item {
            display: flex;
            gap: 22px;
            align-items: flex-start;
            position: relative;
            z-index: 1;
            padding: 20px 0;
        }
        .step-number {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: var(--bg-white);
            border: 3px solid var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 800;
            color: var(--primary);
            flex-shrink: 0;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .step-item:hover .step-number {
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-md);
            transform: scale(1.06);
        }
        .step-body {
            padding-top: 6px;
        }
        .step-body h4 {
            font-size: 19px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
        }
        .step-body p {
            font-size: 15px;
            color: var(--text-weak);
            line-height: 1.7;
        }

        /* Stats Row */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-item {
            padding: 20px;
        }
        .stat-number {
            font-size: clamp(30px, 4vw, 44px);
            font-weight: 800;
            color: var(--accent-light);
            line-height: 1.1;
        }
        .stat-label {
            font-size: 14px;
            color: #cbd5e1;
            margin-top: 6px;
        }

        /* Scenario Cards */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        .scenario-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .scenario-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .scenario-body {
            padding: 24px 22px;
        }
        .scenario-body h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
        .scenario-body p {
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.7;
        }
        .scenario-tag {
            display: inline-block;
            background: #fef3c7;
            color: #92400e;
            font-size: 11px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 14px;
            margin-bottom: 10px;
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            border-color: var(--border);
            box-shadow: var(--shadow);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 20px 24px;
            font-weight: 600;
            font-size: 16px;
            color: var(--text);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 14px;
            cursor: pointer;
            transition: all var(--transition-fast);
            background: transparent;
        }
        .faq-question:hover {
            color: var(--primary);
            background: #f8fafc;
        }
        .faq-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #eff6ff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: var(--primary);
            flex-shrink: 0;
            transition: all var(--transition-fast);
        }
        .faq-item.open .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-weak);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* CTA Section */
        .cta-section {
            padding: 64px 0;
            text-align: center;
        }
        .cta-card {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: var(--radius-xl);
            padding: 52px 40px;
            color: #fff;
            box-shadow: var(--shadow-lg);
            max-width: 800px;
            margin: 0 auto;
        }
        .cta-card h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            margin-bottom: 12px;
            color: #fff;
        }
        .cta-card p {
            font-size: 16px;
            color: #cbd5e1;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .cta-card .btn {
            font-size: 16px;
            padding: 15px 32px;
        }

        /* Footer */
        .footer {
            background: var(--bg-deep);
            color: #cbd5e1;
            padding: 56px 0 28px;
            font-size: 14px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand p {
            color: #94a3b8;
            line-height: 1.7;
            margin-top: 10px;
            font-size: 13px;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }
        .footer-col h5 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-col a {
            display: block;
            padding: 5px 0;
            color: #94a3b8;
            font-size: 13px;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 13px;
            color: #64748b;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            :root {
                --nav-height: 62px;
            }
            .topbar {
                display: none;
            }
            .nav-links {
                display: none;
            }
            .nav-cta.desktop {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-mobile-panel {
                display: flex;
            }
            .nav-overlay {
                display: none;
            }
            .nav-overlay.open {
                display: block;
            }
            .hero-section {
                padding: 56px 0 60px;
            }
            .section {
                padding: 48px 0;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .cta-card {
                padding: 36px 24px;
            }
            .step-number {
                width: 56px;
                height: 56px;
                font-size: 20px;
            }
            .steps-list::before {
                left: 27px;
            }
            .step-item {
                gap: 16px;
            }
            .hero-section h1 {
                font-size: 28px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .btn {
                padding: 12px 22px;
                font-size: 14px;
            }
            .btn-lg {
                padding: 14px 26px;
                font-size: 15px;
            }
        }
        @media (max-width: 480px) {
            .container,
            .container-narrow,
            .container-wide {
                padding: 0 16px;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-buttons .btn {
                justify-content: center;
                text-align: center;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-number {
                font-size: 26px;
            }
            .feature-card {
                padding: 24px 18px;
            }
            .faq-question {
                font-size: 15px;
                padding: 16px 18px;
            }
            .faq-answer {
                padding: 0 18px 16px;
                font-size: 14px;
            }
            .section-header h2 {
                font-size: 22px;
            }
        }