/* roulang page: index */
:root {
            --brand-500: #2b8fff;
            --brand-600: #1470f5;
            --brand-700: #0d5be1;
            --accent-500: #14b896;
            --accent-600: #0d957b;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8e8ea0;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --border-light: #e8ecf0;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-sm: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s, box-shadow 0.2s;
        }
        a:focus-visible {
            outline: 2px solid var(--brand-500);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button:focus-visible {
            outline: 2px solid var(--brand-500);
            outline-offset: 2px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }
        /* header / nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 3px rgba(0,0,0,0.03);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 16px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--brand-700);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-logo i {
            font-size: 1.6rem;
            color: var(--brand-500);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            flex-wrap: nowrap;
        }
        .nav-links li a {
            display: inline-block;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        .nav-links li a:hover {
            background: rgba(43, 143, 255, 0.08);
            color: var(--brand-600);
        }
        .nav-links li a.active {
            background: rgba(43, 143, 255, 0.12);
            color: var(--brand-700);
            font-weight: 600;
        }
        .nav-search {
            display: flex;
            align-items: center;
            background: var(--bg-body);
            border: 1px solid var(--border-light);
            border-radius: 40px;
            padding: 0 16px;
            height: 38px;
            min-width: 180px;
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        .nav-search:focus-within {
            border-color: var(--brand-400);
            box-shadow: 0 0 0 3px rgba(43, 143, 255, 0.12);
        }
        .nav-search input {
            border: none;
            background: transparent;
            outline: none;
            flex: 1;
            font-size: 0.9rem;
            padding: 6px 0;
            color: var(--text-primary);
        }
        .nav-search input::placeholder {
            color: var(--text-muted);
        }
        .nav-search button {
            background: none;
            border: none;
            color: var(--text-muted);
            cursor: pointer;
            padding: 4px 0 4px 8px;
            font-size: 1rem;
            transition: color 0.2s;
        }
        .nav-search button:hover {
            color: var(--brand-500);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }
        .nav-toggle:hover {
            background: rgba(0,0,0,0.04);
        }
        /* mobile drawer */
        .mobile-drawer {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            padding: 16px 20px;
            box-shadow: 0 8px 24px rgba(0,0,0,0.06);
            z-index: 49;
            max-height: calc(100vh - 64px);
            overflow-y: auto;
        }
        .mobile-drawer.open {
            display: block;
        }
        .mobile-drawer ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-drawer ul li a {
            display: block;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-secondary);
        }
        .mobile-drawer ul li a:hover {
            background: rgba(43, 143, 255, 0.06);
            color: var(--brand-600);
        }
        .mobile-drawer ul li a.active {
            background: rgba(43, 143, 255, 0.10);
            color: var(--brand-700);
        }
        .mobile-drawer .mobile-search {
            margin-top: 12px;
            display: flex;
            border: 1px solid var(--border-light);
            border-radius: 40px;
            overflow: hidden;
            background: var(--bg-body);
        }
        .mobile-drawer .mobile-search input {
            flex: 1;
            border: none;
            padding: 10px 16px;
            font-size: 0.95rem;
            background: transparent;
            outline: none;
        }
        .mobile-drawer .mobile-search button {
            background: none;
            border: none;
            padding: 10px 16px;
            color: var(--text-muted);
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .nav-search {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .nav-logo {
                font-size: 1.1rem;
            }
        }
        /* hero */
        .hero-section {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0f2859 0%, #134093 40%, #0d5be1 100%);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            mix-blend-mode: overlay;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(20, 112, 245, 0.25) 0%, transparent 70%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            padding: 80px 0 70px;
            text-align: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255,255,255,0.15);
            padding: 6px 18px;
            border-radius: 40px;
            color: rgba(255,255,255,0.85);
            font-size: 0.85rem;
            margin-bottom: 24px;
            letter-spacing: 0.3px;
        }
        .hero-content h1 {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
            font-weight: 800;
            color: #ffffff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-content h1 span {
            background: linear-gradient(135deg, #8eccff, #53b0ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-content p {
            font-size: clamp(1rem, 2vw, 1.2rem);
            color: rgba(255,255,255,0.75);
            max-width: 720px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .hero-actions .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #ffffff;
            color: var(--brand-700);
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.05rem;
            box-shadow: 0 4px 16px rgba(0,0,0,0.15);
            transition: transform 0.2s, box-shadow 0.2s;
            border: none;
            cursor: pointer;
        }
        .hero-actions .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0,0,0,0.20);
        }
        .hero-actions .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.10);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255,255,255,0.20);
            color: #ffffff;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 500;
            font-size: 1.05rem;
            transition: background 0.2s, transform 0.2s;
            cursor: pointer;
        }
        .hero-actions .btn-secondary:hover {
            background: rgba(255,255,255,0.18);
            transform: translateY(-2px);
        }
        @media (max-width: 640px) {
            .hero-section {
                min-height: 420px;
            }
            .hero-content {
                padding: 60px 0 50px;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
        }
        /* section titles */
        .section-title {
            font-size: clamp(1.5rem, 3vw, 2.1rem);
            font-weight: 700;
            color: var(--text-primary);
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-sub {
            text-align: center;
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 640px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }
        /* cards */
        .card-base {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            box-shadow: 0 2px 12px rgba(0,0,0,0.04);
            transition: transform 0.25s, box-shadow 0.25s;
        }
        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 36px rgba(0,0,0,0.08);
        }
        .feature-card {
            padding: 32px 24px 28px;
            text-align: center;
        }
        .feature-card .icon-wrap {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            color: #fff;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        /* about / intro */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .about-grid .image-wrap {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 4px 24px rgba(0,0,0,0.06);
        }
        .about-grid .image-wrap img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .about-grid .image-wrap:hover img {
            transform: scale(1.03);
        }
        .about-text h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .about-text p {
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
            font-size: 1rem;
        }
        .about-text ul {
            list-style: none;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .about-text ul li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-secondary);
        }
        .about-text ul li i {
            color: var(--accent-500);
            font-size: 1.1rem;
        }
        @media (max-width: 768px) {
            .about-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .about-grid .image-wrap img {
                height: 240px;
            }
        }
        /* posts / news */
        .post-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        .post-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform 0.25s, box-shadow 0.25s;
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 36px rgba(0,0,0,0.08);
        }
        .post-card .thumb {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: #eef2f6;
        }
        .post-card .body {
            padding: 20px 20px 22px;
        }
        .post-card .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .post-card .meta .tag {
            background: rgba(43, 143, 255, 0.08);
            color: var(--brand-600);
            padding: 2px 12px;
            border-radius: 20px;
            font-weight: 500;
        }
        .post-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.5;
            color: var(--text-primary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .read-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--brand-600);
            transition: gap 0.2s;
        }
        .post-card .read-more:hover {
            gap: 12px;
        }
        .empty-news {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 20px;
            color: var(--text-muted);
            font-size: 1rem;
            background: var(--bg-card);
            border: 1px dashed var(--border-light);
            border-radius: var(--radius-md);
        }
        /* steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            position: relative;
            padding: 28px 20px 24px;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            transition: transform 0.25s, box-shadow 0.25s;
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.06);
        }
        .step-item .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
        }
        .step-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        /* faq */
        .faq-list {
            max-width: 800px;
            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-sm);
            overflow: hidden;
            transition: box-shadow 0.2s;
        }
        .faq-item:hover {
            box-shadow: 0 2px 12px rgba(0,0,0,0.04);
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            text-align: left;
            transition: background 0.2s;
        }
        .faq-question:hover {
            background: rgba(43, 143, 255, 0.03);
        }
        .faq-question i {
            color: var(--text-muted);
            transition: transform 0.25s;
            font-size: 1.1rem;
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-secondary);
            line-height: 1.7;
            font-size: 0.95rem;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }
        /* cta */
        .cta-section {
            background: linear-gradient(135deg, #0f2859 0%, #134093 60%, #0d5be1 100%);
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-content h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 14px;
        }
        .cta-content p {
            color: rgba(255,255,255,0.75);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-content .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #ffffff;
            color: var(--brand-700);
            padding: 16px 44px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
            transition: transform 0.2s, box-shadow 0.2s;
            border: none;
            cursor: pointer;
        }
        .cta-content .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0,0,0,0.20);
        }
        /* footer */
        .site-footer {
            background: #0f1a2e;
            color: rgba(255,255,255,0.7);
            padding: 48px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .logo-text {
            font-size: 1.3rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand .logo-text i {
            color: var(--brand-400);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h5 {
            color: #ffffff;
            font-weight: 600;
            font-size: 1rem;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul li a {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
            transition: color 0.2s;
        }
        .footer-col ul li a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.45);
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a:hover {
            color: rgba(255,255,255,0.8);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        /* gaps / spacing */
        .section-padding {
            padding: 72px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 52px 0;
            }
        }
        /* bg variants */
        .bg-soft {
            background: #f1f5f9;
        }
        /* stats */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
        }
        .stat-item .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--brand-600);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-item .label {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        /* smooth extra */
        .transition-base {
            transition: all 0.25s ease;
        }
        .img-cover {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .badge-pill {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 500;
            background: rgba(43, 143, 255, 0.08);
            color: var(--brand-600);
        }
        /* image placeholder fallback */
        .img-placeholder {
            background: linear-gradient(135deg, #e8ecf0, #d5dce4);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

/* roulang page: category1 */
:root {
            --primary: #2563eb;
            --primary-light: #4f8cf7;
            --primary-dark: #1d4ed8;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition: all 0.25s ease;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--bg-body);
            color: var(--text-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        /* header / nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 0.6rem;
            padding-bottom: 0.6rem;
            gap: 1rem;
            flex-wrap: nowrap;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary-dark);
            white-space: nowrap;
        }
        .nav-logo i {
            font-size: 1.4rem;
            color: var(--primary);
        }
        .nav-logo span {
            letter-spacing: -0.01em;
        }
        .nav-links {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 0.25rem;
            flex: 1 1 auto;
            justify-content: center;
        }
        .nav-links li a {
            display: block;
            padding: 0.45rem 0.9rem;
            border-radius: 9999px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-links li a:hover {
            color: var(--primary);
            background: rgba(37, 99, 235, 0.06);
        }
        .nav-links li a.active {
            color: #fff;
            background: var(--primary);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }
        .nav-search {
            display: flex;
            align-items: center;
            background: var(--neutral-100);
            border-radius: 9999px;
            padding: 0.25rem 0.25rem 0.25rem 1rem;
            border: 1px solid transparent;
            transition: var(--transition);
            min-width: 180px;
        }
        .nav-search:focus-within {
            border-color: var(--primary);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        .nav-search input {
            border: none;
            background: transparent;
            padding: 0.35rem 0;
            font-size: 0.85rem;
            outline: none;
            flex: 1;
            min-width: 0;
            color: var(--text-body);
        }
        .nav-search input::placeholder {
            color: var(--text-muted);
        }
        .nav-search button {
            background: var(--primary);
            border: none;
            color: #fff;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
        }
        .nav-search button:hover {
            background: var(--primary-dark);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-body);
            cursor: pointer;
            padding: 0.25rem;
        }
        .mobile-drawer {
            display: none;
            padding: 0 1.25rem 1rem;
            border-top: 1px solid var(--border-light);
        }
        .mobile-drawer ul {
            list-style: none;
            padding: 0;
            margin: 0.5rem 0 0 0;
        }
        .mobile-drawer ul li a {
            display: block;
            padding: 0.6rem 0.75rem;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
        }
        .mobile-drawer ul li a.active {
            color: var(--primary);
            background: rgba(37, 99, 235, 0.06);
        }
        .mobile-drawer .mobile-search {
            display: flex;
            margin-top: 0.75rem;
            background: var(--neutral-100);
            border-radius: 9999px;
            padding: 0.25rem 0.25rem 0.25rem 1rem;
            border: 1px solid transparent;
        }
        .mobile-drawer .mobile-search input {
            border: none;
            background: transparent;
            padding: 0.5rem 0;
            font-size: 0.9rem;
            outline: none;
            flex: 1;
            min-width: 0;
        }
        .mobile-drawer .mobile-search button {
            background: var(--primary);
            border: none;
            color: #fff;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .nav-links,
            .nav-search {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .mobile-drawer.open {
                display: block;
            }
            .nav-logo {
                font-size: 1.05rem;
            }
        }
        @media (min-width: 769px) {
            .mobile-drawer {
                display: none !important;
            }
        }
        /* hero banner */
        .hero-banner {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 60%, #1e3a5f 100%);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.2;
            mix-blend-mode: overlay;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.15), transparent 70%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            padding: 4rem 0 3.5rem;
            max-width: 800px;
        }
        .hero-content h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            color: #fff;
            margin: 0 0 0.75rem;
            letter-spacing: -0.02em;
        }
        .hero-content .hero-sub {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 2rem;
            max-width: 640px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--primary);
            color: #fff;
            padding: 0.7rem 1.8rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
            color: #fff;
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: transparent;
            color: #fff;
            padding: 0.7rem 1.8rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.95rem;
            border: 2px solid rgba(255, 255, 255, 0.3);
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-outline-light:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }
        @media (max-width: 640px) {
            .hero-content h1 {
                font-size: 2rem;
            }
            .hero-content .hero-sub {
                font-size: 1rem;
            }
            .hero-banner {
                min-height: 320px;
            }
        }
        /* section common */
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 0.5rem;
            color: var(--text-body);
        }
        .section-sub {
            text-align: center;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto 2.5rem;
            font-size: 1.05rem;
        }
        .section-pad {
            padding: 4.5rem 0;
        }
        @media (max-width: 640px) {
            .section-title {
                font-size: 1.6rem;
            }
            .section-pad {
                padding: 3rem 0;
            }
        }
        /* cards grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            padding: 1.75rem 1.5rem;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(37, 99, 235, 0.15);
        }
        .card .icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 1rem;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }
        .card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 0 0 0.5rem;
        }
        .card p {
            color: var(--text-muted);
            font-size: 0.92rem;
            margin: 0;
            line-height: 1.6;
        }
        /* steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.5rem;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            padding: 2rem 1.5rem;
            text-align: center;
            position: relative;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            counter-increment: step;
        }
        .step-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .step-card .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            margin: 0 auto 1rem;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
        }
        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin: 0 0 0.4rem;
        }
        .step-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin: 0;
        }
        /* feature list */
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 1.25rem;
        }
        .feature-item {
            display: flex;
            gap: 1rem;
            align-items: flex-start;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 1.25rem 1.25rem;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .feature-item:hover {
            border-color: rgba(37, 99, 235, 0.2);
            box-shadow: var(--shadow-sm);
        }
        .feature-item .fi-icon {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 0.95rem;
        }
        .feature-item .fi-text h4 {
            font-size: 1rem;
            font-weight: 600;
            margin: 0 0 0.2rem;
        }
        .feature-item .fi-text p {
            color: var(--text-muted);
            font-size: 0.88rem;
            margin: 0;
            line-height: 1.5;
        }
        /* faq */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 1.1rem 1.5rem;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: rgba(37, 99, 235, 0.15);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 0.98rem;
            gap: 1rem;
        }
        .faq-question i {
            transition: transform 0.3s;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.25s ease;
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.6;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 0.75rem;
        }
        /* cta banner */
        .cta-banner {
            background: linear-gradient(135deg, #1e293b, #0f172a);
            border-radius: var(--radius-xl);
            padding: 3.5rem 2.5rem;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-banner .cta-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.1;
            mix-blend-mode: overlay;
        }
        .cta-banner * {
            position: relative;
            z-index: 2;
        }
        .cta-banner h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 0 0 0.75rem;
        }
        .cta-banner p {
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 1.75rem;
            font-size: 1.05rem;
        }
        .cta-banner .btn-primary {
            background: var(--accent);
            color: #1e293b;
            box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
        }
        .cta-banner .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(245, 158, 11, 0.4);
        }
        @media (max-width: 640px) {
            .cta-banner {
                padding: 2.5rem 1.25rem;
            }
            .cta-banner h2 {
                font-size: 1.5rem;
            }
        }
        /* footer */
        .site-footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.8);
            padding: 3.5rem 0 1.5rem;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo-text {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 0.75rem;
        }
        .footer-brand .logo-text i {
            color: var(--primary-light);
        }
        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.6;
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
        }
        .footer-col h5 {
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            margin: 0 0 0.75rem;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 0.4rem;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.88rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-col ul li span {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.5rem;
            padding-top: 1.5rem;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
        }
        /* responsive images */
        .img-cover-round {
            border-radius: var(--radius-lg);
            object-fit: cover;
            width: 100%;
            height: 100%;
        }
        /* extra */
        .badge {
            display: inline-block;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            padding: 0.2rem 0.8rem;
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 500;
        }
        .text-muted {
            color: var(--text-muted);
        }
        .gap-section {
            height: 1px;
            background: var(--border-light);
            margin: 0;
        }
        /* scenario cards */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.5rem;
        }
        .scenario-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .scenario-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .scenario-card .sc-img {
            height: 180px;
            background-size: cover;
            background-position: center;
        }
        .scenario-card .sc-body {
            padding: 1.25rem 1.5rem 1.5rem;
        }
        .scenario-card .sc-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin: 0 0 0.35rem;
        }
        .scenario-card .sc-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin: 0;
            line-height: 1.6;
        }
        /* highlight bar */
        .highlight-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem 1.5rem;
            justify-content: center;
            padding: 1rem 0;
        }
        .highlight-bar .hl-item {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .highlight-bar .hl-item i {
            color: var(--primary);
        }
        .focus\:ring-2:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
        }
        .focus\:outline-none:focus {
            outline: none;
        }

/* roulang page: article */
:root {
            --primary: #1e40af;
            --primary-light: #3b82f6;
            --primary-dark: #1e3a8a;
            --primary-bg: #eff6ff;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --gray-bg: #f8fafc;
            --gray-border: #e2e8f0;
            --gray-text: #64748b;
            --dark-text: #0f172a;
            --white: #ffffff;
            --radius: 12px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --transition: all 0.25s ease;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            color: var(--dark-text);
            background: var(--white);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-light); }
        img { max-width: 100%; height: auto; display: block; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* header & nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--gray-border);
            box-shadow: 0 1px 4px rgba(0,0,0,0.03);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 16px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary-dark);
            white-space: nowrap;
        }
        .nav-logo i { color: var(--primary); font-size: 1.5rem; }
        .nav-logo span { letter-spacing: 0.5px; }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 8px;
            align-items: center;
            flex-shrink: 0;
        }
        .nav-links li a {
            padding: 8px 18px;
            border-radius: 8px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--dark-text);
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-links li a:hover { background: var(--primary-bg); color: var(--primary); }
        .nav-links li a.active { background: var(--primary); color: var(--white); }
        .nav-search {
            display: flex;
            align-items: center;
            background: var(--gray-bg);
            border-radius: 8px;
            border: 1px solid var(--gray-border);
            overflow: hidden;
            transition: var(--transition);
            flex: 1;
            max-width: 280px;
        }
        .nav-search:focus-within { border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(59,130,246,0.15); }
        .nav-search input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 8px 14px;
            font-size: 0.9rem;
            outline: none;
            color: var(--dark-text);
            min-width: 0;
        }
        .nav-search input::placeholder { color: var(--gray-text); }
        .nav-search button {
            background: transparent;
            border: none;
            padding: 8px 14px;
            color: var(--gray-text);
            cursor: pointer;
            transition: var(--transition);
        }
        .nav-search button:hover { color: var(--primary); }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.6rem; color: var(--dark-text); cursor: pointer; padding: 4px 8px; }
        .mobile-drawer {
            display: none;
            background: var(--white);
            border-top: 1px solid var(--gray-border);
            padding: 16px 20px 24px;
        }
        .mobile-drawer.open { display: block; }
        .mobile-drawer ul { list-style: none; display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
        .mobile-drawer ul li a {
            display: block;
            padding: 12px 16px;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 500;
            color: var(--dark-text);
            transition: var(--transition);
        }
        .mobile-drawer ul li a:hover { background: var(--primary-bg); color: var(--primary); }
        .mobile-drawer ul li a.active { background: var(--primary); color: var(--white); }
        .mobile-search { display: flex; align-items: center; background: var(--gray-bg); border-radius: 8px; border: 1px solid var(--gray-border); overflow: hidden; }
        .mobile-search input { flex: 1; border: none; background: transparent; padding: 10px 14px; font-size: 0.95rem; outline: none; }
        .mobile-search button { background: transparent; border: none; padding: 10px 14px; color: var(--gray-text); cursor: pointer; }

        /* hero */
        .article-hero {
            position: relative;
            min-height: 360px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 80px 20px 60px;
            background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
            overflow: hidden;
        }
        .article-hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.20;
            z-index: 0;
        }
        .article-hero .container { position: relative; z-index: 1; }
        .article-hero .hero-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            font-size: 0.95rem;
            color: rgba(255,255,255,0.8);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .article-hero .hero-meta span { display: flex; align-items: center; gap: 6px; }
        .article-hero .hero-category {
            display: inline-block;
            background: rgba(255,255,255,0.2);
            color: var(--white);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 12px;
            backdrop-filter: blur(4px);
        }
        .article-hero h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--white);
            line-height: 1.3;
            max-width: 860px;
            margin: 0 auto 16px;
            text-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        .article-hero .hero-desc {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.85);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .not-found-hero h1 { font-size: 2rem; }

        /* main content */
        .article-main {
            padding: 50px 0 60px;
            background: var(--white);
        }
        .article-body {
            max-width: 820px;
            margin: 0 auto;
            font-size: 1.05rem;
            line-height: 1.85;
            color: #1e293b;
        }
        .article-body h2 { font-size: 1.65rem; font-weight: 700; margin: 36px 0 16px; color: var(--dark-text); }
        .article-body h3 { font-size: 1.3rem; font-weight: 600; margin: 28px 0 12px; color: var(--dark-text); }
        .article-body p { margin-bottom: 18px; }
        .article-body ul, .article-body ol { margin: 0 0 18px 24px; }
        .article-body li { margin-bottom: 8px; }
        .article-body a { color: var(--primary); font-weight: 500; }
        .article-body a:hover { text-decoration: underline; }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 8px 8px 0;
            color: #334155;
            font-style: normal;
        }
        .article-body img { border-radius: var(--radius); margin: 24px 0; box-shadow: var(--shadow-sm); }
        .article-body pre { background: #1e293b; color: #e2e8f0; padding: 20px 24px; border-radius: var(--radius); overflow-x: auto; font-size: 0.9rem; margin: 24px 0; }

        .not-found-box {
            text-align: center;
            padding: 60px 20px;
            background: var(--gray-bg);
            border-radius: var(--radius);
            border: 1px solid var(--gray-border);
        }
        .not-found-box i { font-size: 3rem; color: var(--gray-text); margin-bottom: 16px; }
        .not-found-box h2 { font-size: 1.5rem; font-weight: 600; margin-bottom: 12px; }
        .not-found-box p { color: var(--gray-text); margin-bottom: 24px; font-size: 1rem; }
        .not-found-box .btn-back { display: inline-block; background: var(--primary); color: var(--white); padding: 12px 32px; border-radius: 8px; font-weight: 600; transition: var(--transition); }
        .not-found-box .btn-back:hover { background: var(--primary-dark); color: var(--white); transform: translateY(-2px); box-shadow: var(--shadow-md); }

        /* related */
        .related-section {
            background: var(--gray-bg);
            padding: 60px 0;
            border-top: 1px solid var(--gray-border);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 40px;
            color: var(--dark-text);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .related-card {
            background: var(--white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--gray-border);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .related-card img { width: 100%; height: 180px; object-fit: cover; }
        .related-card .card-body { padding: 20px; }
        .related-card .card-body h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--dark-text); }
        .related-card .card-body h3 a { color: var(--dark-text); }
        .related-card .card-body h3 a:hover { color: var(--primary); }
        .related-card .card-body p { font-size: 0.9rem; color: var(--gray-text); line-height: 1.6; }
        .related-card .card-meta { font-size: 0.8rem; color: var(--gray-text); margin-top: 12px; display: flex; align-items: center; gap: 8px; }

        /* faq */
        .faq-section {
            padding: 60px 0;
            background: var(--white);
        }
        .faq-section .section-title {
            text-align: center;
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 40px;
            color: var(--dark-text);
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--gray-border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 22px;
            background: var(--white);
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--dark-text);
            transition: var(--transition);
            user-select: none;
        }
        .faq-question i { color: var(--primary); transition: transform 0.3s ease; font-size: 0.9rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            background: var(--gray-bg);
        }
        .faq-answer-inner {
            padding: 0 22px 18px;
            color: #334155;
            line-height: 1.7;
            font-size: 0.95rem;
        }
        .faq-item.active .faq-answer { max-height: 300px; }
        .faq-item.active .faq-answer-inner { padding: 0 22px 18px; }

        /* cta */
        .cta-section {
            padding: 60px 0;
            background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
            text-align: center;
            color: var(--white);
        }
        .cta-section h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 16px; }
        .cta-section p { font-size: 1.1rem; opacity: 0.9; max-width: 600px; margin: 0 auto 28px; line-height: 1.7; }
        .cta-btn {
            display: inline-block;
            background: var(--accent);
            color: var(--white);
            padding: 14px 40px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1.05rem;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(245,158,11,0.35);
        }
        .cta-btn:hover { background: var(--accent-light); color: var(--white); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(245,158,11,0.45); }

        /* footer */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 50px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand .logo-text { font-size: 1.3rem; font-weight: 700; color: var(--white); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
        .footer-brand .logo-text i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: #94a3b8; max-width: 320px; }
        .footer-col h5 { font-size: 0.95rem; font-weight: 600; color: var(--white); margin-bottom: 16px; }
        .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
        .footer-col ul li a { color: #94a3b8; font-size: 0.9rem; transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--white); }
        .footer-col ul li span { font-size: 0.9rem; color: #94a3b8; }
        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: #64748b;
        }
        .footer-bottom a { color: #94a3b8; }
        .footer-bottom a:hover { color: var(--white); }

        /* responsive */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .article-hero h1 { font-size: 2rem; }
        }
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .nav-search { display: none; }
            .nav-toggle { display: flex; align-items: center; justify-content: center; }
            .article-hero { min-height: 280px; padding: 60px 20px 40px; }
            .article-hero h1 { font-size: 1.6rem; }
            .article-hero .hero-meta { font-size: 0.85rem; gap: 12px; }
            .article-body { font-size: 0.98rem; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section h2 { font-size: 1.4rem; }
            .cta-section p { font-size: 0.95rem; }
        }
        @media (max-width: 520px) {
            .article-hero h1 { font-size: 1.35rem; }
            .nav-logo { font-size: 1.1rem; }
            .nav-logo i { font-size: 1.2rem; }
        }