/* roulang page: index */
:root {
            --primary: #00BCD4;
            --primary-dark: #0D47A1;
            --accent: #FF6F00;
            --bg-light: #F5F5F5;
            --bg-white: #FFFFFF;
            --text-dark: #1a1a2e;
            --text-soft: #4a4a6a;
            --text-light: #8888aa;
            --border-light: #e0e0e0;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.12);
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-pill: 20px;
            --font-stack: 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: var(--font-stack);
            font-size: 16px;
            line-height: 1.8;
            background: var(--bg-white);
            color: var(--text-soft);
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 48px 0;
            }
            .container {
                padding: 0 16px;
            }
            .container-narrow {
                padding: 0 16px;
            }
        }

        /* Header & Navigation */
        .header-top {
            background: var(--bg-white);
            height: 64px;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
        }
        .header-top .inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--primary-dark);
        }
        .logo i {
            font-size: 28px;
            color: var(--primary);
        }
        .logo span {
            letter-spacing: 1px;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-light);
            border-radius: 999px;
            padding: 0 16px;
            height: 40px;
            width: 220px;
            border: 1px solid transparent;
            transition: border 0.2s, background 0.2s;
        }
        .search-box:focus-within {
            border-color: var(--primary);
            background: var(--bg-white);
        }
        .search-box input {
            background: transparent;
            border: none;
            outline: none;
            flex: 1;
            height: 100%;
            font-size: 14px;
            color: var(--text-dark);
        }
        .search-box input::placeholder {
            color: var(--text-light);
        }
        .search-box i {
            color: var(--text-light);
            font-size: 16px;
            margin-left: 8px;
        }
        .btn-login {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            padding: 0 24px;
            height: 40px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 14px;
            letter-spacing: 0.5px;
            cursor: pointer;
            transition: opacity 0.2s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .btn-login:hover {
            opacity: 0.9;
        }
        .btn-login:active {
            transform: scale(0.97);
        }
        .header-bottom {
            background: #f0f2f5;
            height: 48px;
            display: flex;
            align-items: center;
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 64px;
            z-index: 99;
        }
        .header-bottom .inner {
            display: flex;
            align-items: center;
            gap: 12px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
            overflow-x: auto;
            white-space: nowrap;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .header-bottom .inner::-webkit-scrollbar {
            display: none;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            padding: 6px 20px;
            border-radius: var(--radius-pill);
            background: var(--bg-white);
            color: var(--text-dark);
            font-size: 14px;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
            cursor: pointer;
            border: 1px solid transparent;
            flex-shrink: 0;
        }
        .nav-tab:hover {
            background: rgba(0, 188, 212, 0.08);
        }
        .nav-tab.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .nav-tab i {
            margin-right: 6px;
            font-size: 14px;
        }
        @media (max-width: 768px) {
            .header-top .inner {
                padding: 0 16px;
            }
            .header-bottom .inner {
                padding: 0 16px;
                gap: 8px;
            }
            .search-box {
                width: 140px;
            }
            .search-box input {
                font-size: 13px;
            }
            .nav-tab {
                padding: 5px 14px;
                font-size: 13px;
            }
            .logo {
                font-size: 18px;
            }
            .logo i {
                font-size: 22px;
            }
        }
        @media (max-width: 520px) {
            .search-box {
                width: 100px;
            }
            .search-box input {
                width: 60px;
            }
            .btn-login {
                padding: 0 14px;
                font-size: 13px;
            }
            .btn-login span {
                display: none;
            }
        }

        /* Hero */
        .hero {
            position: relative;
            min-height: 500px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #0D47A1 0%, #00BCD4 100%);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(13, 71, 161, 0.7) 0%, rgba(0, 188, 212, 0.5) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 60px 24px;
            max-width: 800px;
        }
        .hero-content h1 {
            font-size: 42px;
            font-weight: 700;
            color: #fff;
            line-height: 1.3;
            margin-bottom: 20px;
            letter-spacing: 1px;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
        }
        .hero-content .subtitle {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.9);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .hero-buttons .btn-primary {
            background: #fff;
            color: var(--primary-dark);
            padding: 14px 36px;
            border-radius: var(--radius-btn);
            font-weight: 700;
            font-size: 16px;
            transition: transform 0.2s, box-shadow 0.2s;
            cursor: pointer;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .hero-buttons .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }
        .hero-buttons .btn-secondary {
            background: transparent;
            color: #fff;
            padding: 14px 36px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 16px;
            border: 2px solid rgba(255, 255, 255, 0.7);
            transition: background 0.2s, border-color 0.2s;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .hero-buttons .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
        }
        @media (max-width: 768px) {
            .hero {
                min-height: 400px;
            }
            .hero-content h1 {
                font-size: 30px;
            }
            .hero-content .subtitle {
                font-size: 16px;
            }
            .hero-content {
                padding: 40px 16px;
            }
            .hero-buttons .btn-primary,
            .hero-buttons .btn-secondary {
                padding: 12px 28px;
                font-size: 15px;
            }
        }
        @media (max-width: 520px) {
            .hero {
                min-height: 320px;
            }
            .hero-content h1 {
                font-size: 24px;
            }
            .hero-content .subtitle {
                font-size: 14px;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }
        }

        /* Section titles */
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .section-title p {
            font-size: 16px;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-title h2 {
                font-size: 22px;
            }
            .section-title p {
                font-size: 14px;
            }
            .section-title {
                margin-bottom: 32px;
            }
        }

        /* Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .step-card {
            background: var(--bg-white);
            border-radius: var(--radius-card);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
            text-align: center;
            position: relative;
            transition: transform 0.25s, box-shadow 0.25s;
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 28px;
            color: #fff;
        }
        .step-number {
            position: absolute;
            top: 12px;
            right: 16px;
            font-size: 48px;
            font-weight: 800;
            color: rgba(0, 188, 212, 0.10);
            line-height: 1;
        }
        .step-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 10px;
        }
        .step-card p {
            font-size: 15px;
            color: var(--text-soft);
            line-height: 1.6;
        }
        .step-arrow {
            display: none;
        }
        @media (min-width: 769px) {
            .step-card {
                position: relative;
            }
            .step-card:not(:last-child)::after {
                content: '→';
                position: absolute;
                right: -22px;
                top: 50%;
                transform: translateY(-50%);
                font-size: 28px;
                color: var(--primary);
                opacity: 0.4;
                font-weight: 300;
            }
        }
        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .step-card {
                padding: 24px 20px;
            }
            .step-icon {
                width: 52px;
                height: 52px;
                font-size: 22px;
            }
            .step-card h3 {
                font-size: 18px;
            }
        }

        /* Cases */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .case-card {
            background: var(--bg-white);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s, box-shadow 0.25s;
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .case-card .img-wrap {
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--bg-light);
        }
        .case-card .img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s;
        }
        .case-card:hover .img-wrap img {
            transform: scale(1.05);
        }
        .case-card .content {
            padding: 16px 20px 20px;
        }
        .case-card .content h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .case-card .content .stat {
            font-size: 20px;
            font-weight: 700;
            color: var(--accent);
        }
        .case-card .content .stat-label {
            font-size: 13px;
            color: var(--text-light);
        }
        @media (max-width: 1024px) {
            .cases-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .cases-grid {
                grid-template-columns: 1fr;
            }
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 0;
            cursor: pointer;
            user-select: none;
            transition: color 0.2s;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-dark);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            font-size: 18px;
            color: var(--text-light);
            transition: transform 0.3s;
        }
        .faq-item.open .faq-question i {
            transform: rotate(45deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0;
            color: var(--text-soft);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 0 20px 0;
        }
        @media (max-width: 768px) {
            .faq-question {
                font-size: 15px;
                padding: 14px 0;
            }
            .faq-answer {
                font-size: 14px;
            }
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, #0D47A1 0%, #00BCD4 100%);
            padding: 80px 0;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section .sub {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 32px;
        }
        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .cta-buttons .btn-cta-primary {
            background: #fff;
            color: var(--primary-dark);
            padding: 14px 40px;
            border-radius: var(--radius-btn);
            font-weight: 700;
            font-size: 16px;
            transition: transform 0.2s, box-shadow 0.2s;
            cursor: pointer;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-buttons .btn-cta-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
        }
        .cta-buttons .btn-cta-secondary {
            background: transparent;
            color: #fff;
            padding: 14px 40px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 16px;
            border: 2px solid rgba(255, 255, 255, 0.7);
            transition: background 0.2s, border-color 0.2s;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-buttons .btn-cta-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section .sub {
                font-size: 16px;
            }
            .cta-buttons .btn-cta-primary,
            .cta-buttons .btn-cta-secondary {
                padding: 12px 28px;
                font-size: 15px;
            }
        }

        /* News List */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg-white);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s, box-shadow 0.25s;
            border: 1px solid rgba(0, 0, 0, 0.04);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .news-card .img-wrap {
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--bg-light);
            position: relative;
        }
        .news-card .img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s;
        }
        .news-card:hover .img-wrap img {
            transform: scale(1.05);
        }
        .news-card .tag {
            position: absolute;
            top: 10px;
            left: 10px;
            background: var(--accent);
            color: #fff;
            padding: 2px 12px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .news-card .content {
            padding: 16px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .content h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card .content .excerpt {
            font-size: 14px;
            color: var(--text-soft);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
            flex: 1;
        }
        .news-card .content .meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-light);
        }
        .news-card .content .meta .date i {
            margin-right: 4px;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--text-light);
            font-size: 16px;
            background: var(--bg-light);
            border-radius: var(--radius-card);
        }
        .news-empty i {
            font-size: 48px;
            margin-bottom: 16px;
            opacity: 0.4;
            display: block;
        }
        @media (max-width: 1024px) {
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .news-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Footer */
        .site-footer {
            background: #1a1a2e;
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand .logo i {
            color: var(--primary);
        }
        .footer-brand .desc {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
        }
        .footer-col h5 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: color 0.2s;
        }
        .footer-col ul li a:hover {
            color: var(--primary);
        }
        .footer-col .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 12px;
        }
        .footer-col .contact-item i {
            width: 20px;
            color: var(--primary);
        }
        .footer-bottom {
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-brand .desc {
                max-width: 100%;
            }
            .site-footer {
                padding: 40px 0 0;
            }
        }

        /* Utility */
        .bg-light-section {
            background: var(--bg-light);
        }
        .text-center {
            text-align: center;
        }
        .mt-12 {
            margin-top: 12px;
        }
        .mb-12 {
            margin-bottom: 12px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .w-full {
            width: 100%;
        }

/* roulang page: category1 */
:root {
            --primary: #00BCD4;
            --primary-dark: #0097A7;
            --navy: #0D47A1;
            --accent: #FF6F00;
            --bg-light: #F5F5F5;
            --text-dark: #1a1a2e;
            --text-muted: #6B7280;
            --border: #E5E7EB;
            --radius: 12px;
            --shadow: 0 2px 8px rgba(0,0,0,0.08);
            --shadow-hover: 0 6px 20px rgba(0,0,0,0.12);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-dark);
            background: #fff;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* Header Top */
        .header-top {
            background: #fff;
            height: 60px;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .header-top .inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--navy);
        }
        .logo i {
            color: var(--primary);
            font-size: 26px;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .search-box {
            position: relative;
            display: flex;
            align-items: center;
        }
        .search-box input {
            width: 220px;
            height: 40px;
            border-radius: 40px;
            border: 1px solid var(--border);
            padding: 0 44px 0 18px;
            font-size: 14px;
            outline: none;
            transition: border 0.3s;
            background: var(--bg-light);
        }
        .search-box input:focus {
            border-color: var(--primary);
            background: #fff;
        }
        .search-box i {
            position: absolute;
            right: 14px;
            color: var(--text-muted);
            font-size: 16px;
            pointer-events: none;
        }
        .btn-login {
            display: flex;
            align-items: center;
            gap: 6px;
            height: 40px;
            padding: 0 20px;
            border-radius: 8px;
            background: linear-gradient(135deg, var(--primary), var(--navy));
            color: #fff;
            border: none;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-login:hover {
            opacity: 0.92;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 188, 212, 0.35);
        }
        .btn-login i {
            font-size: 18px;
        }
        /* Header Bottom */
        .header-bottom {
            background: #f0f2f5;
            height: 48px;
            display: flex;
            align-items: center;
            overflow-x: auto;
            white-space: nowrap;
            scrollbar-width: none;
            border-bottom: 1px solid var(--border);
        }
        .header-bottom::-webkit-scrollbar {
            display: none;
        }
        .header-bottom .inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            gap: 12px;
            height: 100%;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            border-radius: 20px;
            background: #fff;
            color: #333;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.25s ease;
            border: 1px solid transparent;
        }
        .nav-tab i {
            font-size: 14px;
        }
        .nav-tab:hover {
            background: #e0f7fa;
            color: var(--primary-dark);
        }
        .nav-tab.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        /* Section Spacing */
        .section {
            padding: 80px 0;
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 12px;
            color: var(--text-dark);
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-muted);
            margin-bottom: 48px;
            max-width: 640px;
        }
        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 48px;
            padding: 0 32px;
            border-radius: 8px;
            background: linear-gradient(135deg, var(--primary), var(--navy));
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            opacity: 0.92;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 188, 212, 0.35);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 48px;
            padding: 0 32px;
            border-radius: 8px;
            background: transparent;
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            border: 2px solid #fff;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.15);
            transform: translateY(-2px);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 48px;
            padding: 0 32px;
            border-radius: 8px;
            background: #fff;
            color: var(--primary-dark);
            font-size: 16px;
            font-weight: 600;
            border: 2px solid var(--primary);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 188, 212, 0.25);
        }
        /* Cards */
        .card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        /* Badge */
        .badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
            background: var(--accent);
            color: #fff;
        }
        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 52px;
            padding: 0 4px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 500;
            transition: color 0.3s;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            transition: transform 0.3s ease;
            font-size: 18px;
            color: var(--text-muted);
        }
        .faq-item.open .faq-question i {
            transform: rotate(45deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 4px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 4px 20px 4px;
        }
        /* Footer */
        .site-footer {
            background: #1a1a2e;
            color: #e0e0e0;
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .logo i {
            color: var(--primary);
        }
        .footer-brand .desc {
            font-size: 14px;
            line-height: 1.7;
            color: #b0b0c0;
        }
        .footer-col h5 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-col ul li a {
            color: #b0b0c0;
            font-size: 14px;
            transition: color 0.3s;
        }
        .footer-col ul li a:hover {
            color: var(--primary);
        }
        .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: #b0b0c0;
            margin-bottom: 12px;
        }
        .contact-item i {
            color: var(--primary);
            width: 18px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
            color: #888;
        }
        /* Hero */
        .hero {
            position: relative;
            height: 500px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #0D47A1 0%, #00BCD4 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: 0.35;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: rgba(0,0,0,0.45);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            color: #fff;
            max-width: 800px;
            padding: 0 24px;
        }
        .hero-content h1 {
            font-size: 40px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: 1px;
        }
        .hero-content p {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        /* Step Cards */
        .step-card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 32px 24px;
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
        }
        .step-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--navy));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            margin: 0 auto 16px;
        }
        .step-card h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .step-arrow {
            display: none;
        }
        @media (min-width: 768px) {
            .step-arrow {
                display: flex;
                align-items: center;
                justify-content: center;
                font-size: 28px;
                color: var(--primary);
                opacity: 0.5;
            }
        }
        /* Feature Grid */
        .feature-card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 32px 28px;
            transition: all 0.3s ease;
            border: 1px solid transparent;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: var(--primary);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            color: var(--primary-dark);
            margin-bottom: 16px;
        }
        .feature-card h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        /* Scene Cards */
        .scene-card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .scene-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .scene-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }
        .scene-card .body {
            padding: 20px 24px 24px;
        }
        .scene-card .body h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .scene-card .body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #0D47A1 0%, #00BCD4 100%);
            padding: 80px 0;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 32px;
        }
        .cta-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero {
                height: 420px;
            }
            .hero-content h1 {
                font-size: 34px;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .hero {
                height: 360px;
            }
            .hero-content h1 {
                font-size: 28px;
            }
            .hero-content p {
                font-size: 16px;
            }
            .search-box input {
                width: 140px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .header-actions .btn-login span {
                display: none;
            }
            .btn-login {
                padding: 0 14px;
            }
        }
        @media (max-width: 640px) {
            .hero {
                height: 300px;
            }
            .hero-content h1 {
                font-size: 24px;
            }
            .hero-content p {
                font-size: 15px;
            }
            .search-box input {
                width: 100px;
            }
            .container {
                padding: 0 16px;
            }
            .header-top .inner {
                padding: 0 16px;
            }
            .header-bottom .inner {
                padding: 0 16px;
                gap: 8px;
            }
            .nav-tab {
                padding: 5px 14px;
                font-size: 13px;
            }
            .btn-primary, .btn-outline, .btn-secondary {
                height: 44px;
                padding: 0 24px;
                font-size: 14px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section p {
                font-size: 16px;
            }
        }
        /* Utility */
        .text-gradient {
            background: linear-gradient(135deg, var(--primary), var(--navy));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .gap-8 {
            gap: 32px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
        }
        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            padding: 20px 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--primary-dark);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb i {
            font-size: 12px;
            color: #ccc;
        }
        /* Category Content */
        .category-content {
            padding-bottom: 40px;
        }
        /* Animation */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            animation: fadeUp 0.6s ease forwards;
        }
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }
        .delay-4 { animation-delay: 0.4s; }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00BCD4;
            --primary-dark: #0D47A1;
            --accent: #FF6F00;
            --bg-light: #F5F5F5;
            --bg-white: #FFFFFF;
            --text-dark: #1a1a2e;
            --text-muted: #6b7280;
            --text-light: #9ca3af;
            --border-color: #e5e7eb;
            --radius: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
            --shadow-hover: 0 6px 20px rgba(0,0,0,0.12);
            --transition: all 0.3s ease;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-dark);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:hover { opacity: 0.85; }
        img { max-width: 100%; height: auto; display: block; }
        button { cursor: pointer; font-family: inherit; }
        input, textarea { font-family: inherit; outline: none; }
        ul, ol { list-style: none; }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== Header Top ===== */
        .header-top {
            background: var(--bg-white);
            height: 60px;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .header-top .inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 700;
            color: var(--primary-dark);
        }
        .logo i { color: var(--primary); font-size: 24px; }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .search-box {
            position: relative;
            width: 200px;
        }
        .search-box input {
            width: 100%;
            height: 36px;
            border-radius: 18px;
            border: 1px solid var(--border-color);
            padding: 0 36px 0 14px;
            font-size: 13px;
            background: var(--bg-light);
            transition: var(--transition);
        }
        .search-box input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0,188,212,0.15);
        }
        .search-box i {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 14px;
        }
        .btn-login {
            display: flex;
            align-items: center;
            gap: 6px;
            height: 36px;
            padding: 0 18px;
            border-radius: 18px;
            border: none;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(0,188,212,0.3);
        }
        .btn-login:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(0,188,212,0.4);
        }
        .btn-login i { font-size: 16px; }

        /* ===== Header Bottom (Nav Tabs) ===== */
        .header-bottom {
            background: #f0f2f5;
            height: 48px;
            border-bottom: 1px solid var(--border-color);
            overflow-x: auto;
            white-space: nowrap;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .header-bottom::-webkit-scrollbar { display: none; }
        .header-bottom .inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            height: 100%;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            border-radius: 20px;
            background: var(--bg-white);
            color: #333;
            font-size: 13px;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .nav-tab i { font-size: 14px; color: var(--text-muted); }
        .nav-tab:hover {
            background: #e0e7ef;
            border-color: var(--border-color);
        }
        .nav-tab.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .nav-tab.active i { color: #fff; }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 16px 0 0;
            font-size: 13px;
            color: var(--text-muted);
        }
        .breadcrumb a { color: var(--primary); }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb .sep { margin: 0 8px; color: var(--text-light); }
        .breadcrumb .current { color: var(--text-dark); font-weight: 500; }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            background: linear-gradient(135deg, rgba(0,188,212,0.9), rgba(13,71,161,0.9)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            padding: 60px 0 50px;
            color: #fff;
            margin-top: 0;
            border-radius: 0 0 var(--radius) var(--radius);
        }
        .article-hero h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: rgba(255,255,255,0.85);
        }
        .article-meta i { margin-right: 6px; }

        /* ===== Article Body ===== */
        .article-body-wrap {
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            padding: 40px 48px;
            margin-top: -20px;
            position: relative;
            z-index: 2;
        }
        .article-body {
            font-size: 16px;
            line-height: 1.8;
            color: #374151;
        }
        .article-body h2 { font-size: 24px; font-weight: 700; margin: 32px 0 16px; color: var(--text-dark); }
        .article-body h3 { font-size: 20px; font-weight: 600; margin: 24px 0 12px; color: var(--text-dark); }
        .article-body p { margin-bottom: 20px; }
        .article-body ul, .article-body ol { margin-bottom: 20px; padding-left: 24px; }
        .article-body li { margin-bottom: 8px; list-style: disc; }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            padding: 12px 20px;
            margin: 20px 0;
            background: #f0f7f8;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: #374151;
        }
        .article-body img { border-radius: var(--radius-sm); margin: 16px 0; max-width: 100%; }
        .article-body a { color: var(--primary); text-decoration: underline; }

        /* ===== Not Found ===== */
        .not-found {
            text-align: center;
            padding: 60px 20px;
        }
        .not-found i { font-size: 48px; color: var(--primary); margin-bottom: 16px; }
        .not-found h2 { font-size: 24px; font-weight: 700; margin-bottom: 12px; }
        .not-found p { color: var(--text-muted); margin-bottom: 24px; }
        .not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            transition: var(--transition);
        }
        .not-found .btn-back:hover { background: var(--primary-dark); transform: translateY(-2px); }

        /* ===== Related Posts ===== */
        .related-section {
            margin-top: 48px;
            padding-top: 40px;
            border-top: 1px solid var(--border-color);
        }
        .related-section h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--text-dark);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .related-card .thumb {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--bg-light);
        }
        .related-card .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .related-card:hover .thumb img { transform: scale(1.05); }
        .related-card .info {
            padding: 14px 16px 16px;
        }
        .related-card .info h4 {
            font-size: 15px;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .info .date {
            font-size: 12px;
            color: var(--text-light);
        }

        /* ===== Return Button ===== */
        .return-wrap {
            text-align: center;
            margin-top: 32px;
        }
        .btn-return {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            border-radius: var(--radius-sm);
            border: 2px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
            transition: var(--transition);
            background: transparent;
        }
        .btn-return:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1a1a2e;
            color: #e0e0e0;
            padding: 60px 0 0;
            margin-top: 80px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 40px;
        }
        .footer-brand .logo {
            font-size: 22px;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand .logo i { color: var(--primary); }
        .footer-brand .desc {
            font-size: 14px;
            line-height: 1.7;
            color: #b0b0b0;
        }
        .footer-col h5 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: #b0b0b0;
            font-size: 14px;
            transition: var(--transition);
        }
        .footer-col ul li a:hover { color: var(--primary); }
        .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
            font-size: 14px;
            color: #b0b0b0;
        }
        .contact-item i { color: var(--primary); width: 16px; text-align: center; }
        .footer-bottom {
            border-top: 1px solid #2d2d4a;
            padding: 20px 0;
            margin-top: 40px;
            text-align: center;
            font-size: 13px;
            color: #6b7280;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .header-top { height: 56px; }
            .search-box { width: 140px; }
            .article-hero { padding: 40px 0 36px; }
            .article-hero h1 { font-size: 24px; }
            .article-body-wrap { padding: 24px 20px; margin-top: -12px; }
            .related-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        }
        @media (max-width: 640px) {
            .header-top .inner { padding: 0 12px; }
            .search-box { width: 100px; }
            .search-box input { padding: 0 30px 0 10px; font-size: 12px; }
            .btn-login span { display: none; }
            .btn-login { padding: 0 12px; }
            .header-bottom .inner { padding: 0 12px; gap: 6px; }
            .nav-tab { padding: 4px 12px; font-size: 12px; }
            .article-hero h1 { font-size: 20px; }
            .article-meta { gap: 12px; font-size: 12px; flex-direction: column; }
            .article-body-wrap { padding: 16px 14px; }
            .article-body { font-size: 15px; }
            .related-grid { grid-template-columns: 1fr; gap: 12px; }
            .related-card .info { padding: 10px 12px 12px; }
            .related-card .info h4 { font-size: 14px; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { font-size: 12px; }
        }
        @media (max-width: 480px) {
            .header-top { height: 50px; }
            .logo { font-size: 16px; }
            .logo i { font-size: 18px; }
            .search-box { width: 80px; }
            .search-box input { height: 30px; font-size: 11px; padding: 0 24px 0 8px; }
            .search-box i { right: 8px; font-size: 12px; }
            .btn-login { height: 30px; font-size: 12px; padding: 0 10px; }
            .header-bottom { height: 40px; }
            .nav-tab { font-size: 11px; padding: 3px 10px; gap: 4px; }
            .nav-tab i { font-size: 11px; }
            .breadcrumb { font-size: 11px; }
            .article-hero h1 { font-size: 18px; }
            .article-meta { font-size: 11px; }
            .article-body { font-size: 14px; line-height: 1.7; }
            .article-body h2 { font-size: 20px; }
            .article-body h3 { font-size: 17px; }
            .related-card .info h4 { font-size: 13px; }
            .btn-return { font-size: 13px; padding: 8px 20px; }
            .site-footer { padding: 40px 0 0; margin-top: 48px; }
        }