/* roulang page: index */
:root {
            --ds-primary: #1a56db;
            --ds-primary-dark: #1345b5;
            --ds-primary-light: #e8f0fe;
            --ds-accent: #f59e0b;
            --ds-accent-dark: #d97706;
            --ds-accent-light: #fef3c7;
            --ds-bg: #f8fafc;
            --ds-bg-white: #ffffff;
            --ds-bg-dark: #0f172a;
            --ds-bg-section: #f1f5f9;
            --ds-text: #1e293b;
            --ds-text-strong: #0f172a;
            --ds-text-weak: #64748b;
            --ds-text-muted: #94a3b8;
            --ds-border: #e2e8f0;
            --ds-border-light: #f1f5f9;
            --ds-radius-sm: 8px;
            --ds-radius: 12px;
            --ds-radius-lg: 16px;
            --ds-radius-xl: 20px;
            --ds-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
            --ds-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --ds-shadow: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
            --ds-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.10), 0 4px 8px rgba(0, 0, 0, 0.05);
            --ds-shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12), 0 6px 12px rgba(0, 0, 0, 0.06);
            --ds-shadow-xl: 0 24px 56px rgba(0, 0, 0, 0.14), 0 8px 16px rgba(0, 0, 0, 0.07);
            --ds-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --ds-transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
            --ds-font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --ds-section-padding: 80px 0;
            --ds-section-padding-mobile: 48px 0;
            --ds-container-max: 1200px;
        }

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

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

        body {
            font-family: var(--ds-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--ds-text);
            background-color: var(--ds-bg);
            overflow-x: hidden;
            min-height: 100vh;
        }

        a {
            text-decoration: none;
            transition: color var(--ds-transition-fast);
            color: var(--ds-primary);
        }
        a:hover {
            color: var(--ds-primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--ds-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

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

        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--ds-primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container-custom {
            max-width: var(--ds-container-max);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ========== 导航栏 ========== */
        .ds-navbar {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--ds-border);
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: var(--ds-shadow-xs);
            transition: box-shadow var(--ds-transition);
        }
        .ds-navbar.scrolled {
            box-shadow: var(--ds-shadow-sm);
        }
        .ds-navbar .navbar-toggler {
            border: none;
            padding: 8px 10px;
            color: var(--ds-text);
            font-size: 1.3rem;
            box-shadow: none;
            transition: color var(--ds-transition-fast);
        }
        .ds-navbar .navbar-toggler:hover {
            color: var(--ds-primary);
        }
        .ds-navbar .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--ds-primary);
            outline-offset: 2px;
            border-radius: 6px;
        }
        .ds-nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            min-height: 64px;
            padding: 0 8px;
        }
        .ds-nav-group {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .ds-nav-group-left {
            flex: 0 0 auto;
        }
        .ds-nav-group-right {
            flex: 0 0 auto;
        }
        .ds-nav-logo-wrap {
            flex: 0 0 auto;
            text-align: center;
            padding: 0 16px;
        }
        .ds-nav-logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--ds-text-strong) !important;
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: color var(--ds-transition-fast);
            text-decoration: none !important;
        }
        .ds-nav-logo:hover {
            color: var(--ds-primary) !important;
        }
        .ds-nav-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: var(--ds-radius-sm);
            background: var(--ds-primary);
            color: #fff;
            font-size: 1.1rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .ds-nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--ds-text-weak) !important;
            padding: 8px 14px !important;
            border-radius: var(--ds-radius-sm);
            transition: all var(--ds-transition-fast);
            white-space: nowrap;
            position: relative;
            text-decoration: none !important;
        }
        .ds-nav-link:hover {
            color: var(--ds-primary) !important;
            background: var(--ds-primary-light);
        }
        .ds-nav-link.active {
            color: var(--ds-primary) !important;
            background: var(--ds-primary-light);
            font-weight: 600;
        }
        .ds-nav-link.nav-home {
            font-weight: 600;
            color: var(--ds-text) !important;
        }
        .ds-nav-link.nav-home.active {
            color: var(--ds-primary) !important;
            background: var(--ds-primary-light);
        }
        .ds-nav-cta {
            display: inline-block;
            padding: 9px 20px;
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff !important;
            background: var(--ds-primary);
            border-radius: 50px;
            transition: all var(--ds-transition-fast);
            white-space: nowrap;
            text-decoration: none !important;
            box-shadow: var(--ds-shadow-xs);
        }
        .ds-nav-cta:hover {
            background: var(--ds-primary-dark);
            box-shadow: var(--ds-shadow-sm);
            transform: translateY(-1px);
            color: #fff !important;
        }

        /* ========== Hero 首屏 ========== */
        .ds-hero {
            position: relative;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a4b8c 70%, #0f172a 100%);
            background-image: url('assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            min-height: 620px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .ds-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(15, 23, 42, 0.72);
            z-index: 1;
        }
        .ds-hero .container-custom {
            position: relative;
            z-index: 3;
        }
        .ds-hero-content {
            max-width: 720px;
            padding: 60px 0;
        }
        .ds-hero-badge {
            display: inline-block;
            padding: 6px 16px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--ds-accent);
            background: rgba(245, 158, 11, 0.12);
            border: 1px solid rgba(245, 158, 11, 0.3);
            border-radius: 50px;
            margin-bottom: 20px;
            letter-spacing: 0.03em;
        }
        .ds-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            color: #ffffff;
            line-height: 1.25;
            margin-bottom: 18px;
            letter-spacing: -0.01em;
        }
        .ds-hero h1 span {
            color: var(--ds-accent);
        }
        .ds-hero-lead {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
            margin-bottom: 30px;
            max-width: 600px;
        }
        .ds-hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .ds-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all var(--ds-transition);
            cursor: pointer;
            border: none;
            text-decoration: none !important;
        }
        .ds-btn-primary {
            background: var(--ds-primary);
            color: #fff !important;
            box-shadow: var(--ds-shadow-sm);
        }
        .ds-btn-primary:hover {
            background: var(--ds-primary-dark);
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-2px);
            color: #fff !important;
        }
        .ds-btn-outline-light {
            background: transparent;
            color: #fff !important;
            border: 2px solid rgba(255, 255, 255, 0.5);
        }
        .ds-btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-2px);
            color: #fff !important;
        }
        .ds-btn-accent {
            background: var(--ds-accent);
            color: #1e293b !important;
            box-shadow: var(--ds-shadow-sm);
        }
        .ds-btn-accent:hover {
            background: var(--ds-accent-dark);
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-2px);
            color: #1e293b !important;
        }

        /* ========== 板块通用 ========== */
        .ds-section {
            padding: var(--ds-section-padding);
        }
        .ds-section-alt {
            background: var(--ds-bg-white);
        }
        .ds-section-dark {
            background: var(--ds-bg-dark);
            color: #e2e8f0;
        }
        .ds-section-header {
            text-align: center;
            margin-bottom: 50px;
        }
        .ds-section-header h2 {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--ds-text-strong);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .ds-section-header .section-subtitle {
            font-size: 1.05rem;
            color: var(--ds-text-weak);
            max-width: 560px;
            margin: 0 auto;
        }
        .ds-section-dark .ds-section-header h2 {
            color: #f1f5f9;
        }
        .ds-section-dark .ds-section-header .section-subtitle {
            color: #94a3b8;
        }

        /* ========== 品牌介绍卡片 ========== */
        .ds-brand-intro-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 40px 36px;
            box-shadow: var(--ds-shadow);
            border: 1px solid var(--ds-border);
            max-width: 880px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }
        .ds-brand-intro-card .intro-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: var(--ds-radius);
            background: var(--ds-primary-light);
            color: var(--ds-primary);
            font-size: 1.6rem;
            margin-bottom: 16px;
        }
        .ds-brand-intro-card h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--ds-text-strong);
            margin-bottom: 14px;
        }
        .ds-brand-intro-card p {
            font-size: 1.02rem;
            color: var(--ds-text-weak);
            line-height: 1.85;
            margin-bottom: 0;
        }

        /* ========== 数据统计 ========== */
        .ds-stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .ds-stat-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 30px 24px;
            text-align: center;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border);
            transition: all var(--ds-transition);
        }
        .ds-stat-card:hover {
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-3px);
            border-color: var(--ds-primary);
        }
        .ds-stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--ds-primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .ds-stat-label {
            font-size: 0.95rem;
            color: var(--ds-text-weak);
            font-weight: 500;
        }
        .ds-stat-icon {
            font-size: 2rem;
            margin-bottom: 10px;
            color: var(--ds-accent);
        }

        /* ========== 核心优势卡片 ========== */
        .ds-advantage-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .ds-advantage-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 32px 24px;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border);
            transition: all var(--ds-transition);
            text-align: center;
        }
        .ds-advantage-card:hover {
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .ds-advantage-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            font-size: 1.5rem;
            margin-bottom: 18px;
            transition: all var(--ds-transition);
        }
        .ds-advantage-icon.icon-blue {
            background: #e8f0fe;
            color: #1a56db;
        }
        .ds-advantage-icon.icon-amber {
            background: #fef3c7;
            color: #d97706;
        }
        .ds-advantage-icon.icon-green {
            background: #dcfce7;
            color: #16a34a;
        }
        .ds-advantage-icon.icon-purple {
            background: #f3e8ff;
            color: #7c3aed;
        }
        .ds-advantage-card h4 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--ds-text-strong);
            margin-bottom: 10px;
        }
        .ds-advantage-card p {
            font-size: 0.93rem;
            color: var(--ds-text-weak);
            line-height: 1.65;
            margin: 0;
        }

        /* ========== 分类入口 ========== */
        .ds-category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .ds-category-card {
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border);
            background: var(--ds-bg-white);
            transition: all var(--ds-transition);
            text-decoration: none !important;
            color: inherit;
            display: block;
        }
        .ds-category-card:hover {
            box-shadow: var(--ds-shadow-lg);
            transform: translateY(-5px);
            border-color: transparent;
            color: inherit;
        }
        .ds-category-card .card-img-wrap {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        .ds-category-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .ds-category-card:hover .card-img-wrap img {
            transform: scale(1.06);
        }
        .ds-category-card .card-body-wrap {
            padding: 20px;
        }
        .ds-category-card .card-body-wrap h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--ds-text-strong);
            margin-bottom: 6px;
        }
        .ds-category-card .card-body-wrap p {
            font-size: 0.9rem;
            color: var(--ds-text-weak);
            margin: 0;
            line-height: 1.5;
        }
        .ds-category-card .card-tag {
            display: inline-block;
            padding: 4px 12px;
            font-size: 0.78rem;
            font-weight: 600;
            border-radius: 50px;
            margin-bottom: 10px;
            background: var(--ds-primary-light);
            color: var(--ds-primary);
        }

        /* ========== 品牌故事 ========== */
        .ds-story-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-xl);
            overflow: hidden;
            box-shadow: var(--ds-shadow);
            border: 1px solid var(--ds-border);
        }
        .ds-story-image {
            height: 100%;
            min-height: 400px;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .ds-story-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 86, 219, 0.25) 0%, rgba(15, 23, 42, 0.4) 100%);
        }
        .ds-story-text {
            padding: 40px 36px 40px 10px;
        }
        .ds-story-text h3 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--ds-text-strong);
            margin-bottom: 16px;
        }
        .ds-story-text p {
            font-size: 1rem;
            color: var(--ds-text-weak);
            line-height: 1.8;
            margin-bottom: 12px;
        }
        .ds-story-highlights {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 20px;
        }
        .ds-story-highlight-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--ds-text);
            background: var(--ds-bg-section);
            padding: 8px 16px;
            border-radius: 50px;
        }
        .ds-story-highlight-item i {
            color: var(--ds-primary);
            font-size: 1rem;
        }

        /* ========== 新闻资讯 ========== */
        .ds-news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .ds-news-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border);
            transition: all var(--ds-transition);
        }
        .ds-news-card:hover {
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-3px);
        }
        .ds-news-card .news-img-wrap {
            height: 170px;
            overflow: hidden;
        }
        .ds-news-card .news-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .ds-news-card:hover .news-img-wrap img {
            transform: scale(1.05);
        }
        .ds-news-card .news-body {
            padding: 18px;
        }
        .ds-news-card .news-date {
            font-size: 0.82rem;
            color: var(--ds-text-muted);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .ds-news-card .news-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--ds-text-strong);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .ds-news-card .news-summary {
            font-size: 0.9rem;
            color: var(--ds-text-weak);
            line-height: 1.55;
            margin-bottom: 12px;
        }
        .ds-news-card .news-link {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--ds-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--ds-transition-fast);
            text-decoration: none;
        }
        .ds-news-card .news-link:hover {
            gap: 10px;
            color: var(--ds-primary-dark);
        }

        /* ========== 用户评价 ========== */
        .ds-testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .ds-testimonial-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 28px;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border);
            transition: all var(--ds-transition);
            position: relative;
        }
        .ds-testimonial-card::before {
            content: '\201C';
            font-size: 4rem;
            color: var(--ds-primary);
            opacity: 0.15;
            position: absolute;
            top: 10px;
            left: 20px;
            line-height: 1;
            font-family: serif;
        }
        .ds-testimonial-card:hover {
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-3px);
        }
        .ds-testimonial-card .testimonial-text {
            font-size: 0.98rem;
            color: var(--ds-text-weak);
            line-height: 1.7;
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }
        .ds-testimonial-card .testimonial-author {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .ds-testimonial-card .author-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--ds-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--ds-primary);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .ds-testimonial-card .author-name {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--ds-text-strong);
        }
        .ds-testimonial-card .author-role {
            font-size: 0.82rem;
            color: var(--ds-text-muted);
        }

        /* ========== 合作伙伴 ========== */
        .ds-partners-row {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            gap: 32px 40px;
        }
        .ds-partner-item {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius);
            padding: 20px 28px;
            box-shadow: var(--ds-shadow-xs);
            border: 1px solid var(--ds-border-light);
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--ds-text-weak);
            transition: all var(--ds-transition);
        }
        .ds-partner-item:hover {
            box-shadow: var(--ds-shadow-sm);
            color: var(--ds-primary);
            border-color: var(--ds-primary);
            transform: translateY(-2px);
        }

        /* ========== FAQ ========== */
        .ds-faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }
        .ds-faq-wrap .accordion-item {
            border: 1px solid var(--ds-border);
            border-radius: var(--ds-radius) !important;
            margin-bottom: 12px;
            overflow: hidden;
            box-shadow: var(--ds-shadow-xs);
            background: var(--ds-bg-white);
            transition: all var(--ds-transition-fast);
        }
        .ds-faq-wrap .accordion-item:hover {
            box-shadow: var(--ds-shadow-sm);
        }
        .ds-faq-wrap .accordion-button {
            font-weight: 600;
            font-size: 1rem;
            color: var(--ds-text-strong);
            background: var(--ds-bg-white);
            padding: 18px 20px;
            border-radius: var(--ds-radius) !important;
            box-shadow: none;
            transition: all var(--ds-transition-fast);
        }
        .ds-faq-wrap .accordion-button:not(.collapsed) {
            color: var(--ds-primary);
            background: var(--ds-primary-light);
            box-shadow: none;
            border-bottom: 1px solid var(--ds-border);
        }
        .ds-faq-wrap .accordion-button:focus {
            box-shadow: none;
            outline: 2px solid var(--ds-primary);
            outline-offset: -2px;
            border-radius: var(--ds-radius);
        }
        .ds-faq-wrap .accordion-body {
            font-size: 0.95rem;
            color: var(--ds-text-weak);
            line-height: 1.8;
            padding: 18px 20px;
            background: var(--ds-bg-white);
        }

        /* ========== CTA ========== */
        .ds-cta-section {
            background: linear-gradient(135deg, var(--ds-primary) 0%, #1345b5 50%, #0f3d8e 100%);
            border-radius: var(--ds-radius-xl);
            padding: 50px 40px;
            text-align: center;
            color: #fff;
            box-shadow: var(--ds-shadow-lg);
        }
        .ds-cta-section h3 {
            font-size: 1.9rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .ds-cta-section p {
            font-size: 1.05rem;
            opacity: 0.9;
            margin-bottom: 24px;
            max-width: 550px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ========== 页脚 ========== */
        .ds-footer {
            background: var(--ds-bg-dark);
            color: #cbd5e1;
            padding: 50px 0 30px;
        }
        .ds-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .ds-footer-brand .footer-logo {
            font-size: 1.4rem;
            font-weight: 700;
            color: #f1f5f9;
            margin-bottom: 12px;
            display: inline-block;
            text-decoration: none;
        }
        .ds-footer-brand .footer-logo:hover {
            color: var(--ds-accent);
        }
        .ds-footer-brand p {
            font-size: 0.9rem;
            color: #94a3b8;
            line-height: 1.6;
        }
        .ds-footer-col h5 {
            font-size: 1rem;
            font-weight: 700;
            color: #e2e8f0;
            margin-bottom: 14px;
        }
        .ds-footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .ds-footer-col ul li {
            margin-bottom: 8px;
        }
        .ds-footer-col ul li a {
            font-size: 0.9rem;
            color: #94a3b8;
            text-decoration: none;
            transition: color var(--ds-transition-fast);
        }
        .ds-footer-col ul li a:hover {
            color: var(--ds-accent);
        }
        .ds-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: 0.88rem;
            color: #64748b;
        }
        .ds-footer-social {
            display: flex;
            gap: 14px;
        }
        .ds-footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: #94a3b8;
            font-size: 1rem;
            transition: all var(--ds-transition-fast);
            text-decoration: none;
        }
        .ds-footer-social a:hover {
            background: var(--ds-primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            .ds-nav-group-left .ds-nav-link,
            .ds-nav-group-right .ds-nav-link {
                font-size: 0.85rem;
                padding: 8px 10px !important;
            }
            .ds-nav-logo {
                font-size: 1.3rem;
            }
            .ds-nav-logo .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.95rem;
            }
            .ds-hero h1 {
                font-size: 2.5rem;
            }
            .ds-hero {
                min-height: 500px;
            }
            .ds-stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .ds-advantage-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
            .ds-category-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
            .ds-news-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
            .ds-testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
            .ds-story-block {
                grid-template-columns: 1fr;
                gap: 0;
            }
            .ds-story-image {
                min-height: 280px;
            }
            .ds-story-text {
                padding: 30px 24px;
            }
            .ds-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }

        @media (max-width: 768px) {
            .ds-nav-inner {
                flex-wrap: wrap;
                justify-content: space-between;
                min-height: 56px;
            }
            .ds-nav-group-left,
            .ds-nav-group-right {
                display: none;
            }
            .ds-nav-logo-wrap {
                order: 1;
                flex: 1;
                text-align: left;
                padding-left: 0;
            }
            .navbar-toggler {
                order: 2;
                display: block !important;
            }
            .navbar-collapse {
                order: 3;
                width: 100%;
                flex-basis: 100%;
            }
            .navbar-collapse .ds-nav-group {
                flex-direction: column;
                align-items: stretch;
                gap: 2px;
                padding: 8px 0;
            }
            .navbar-collapse .ds-nav-link {
                padding: 10px 16px !important;
                border-radius: var(--ds-radius-sm);
            }
            .navbar-collapse .ds-nav-cta {
                margin: 8px 4px;
                text-align: center;
            }
            .ds-hero h1 {
                font-size: 2rem;
            }
            .ds-hero-lead {
                font-size: 1rem;
            }
            .ds-hero {
                min-height: 420px;
            }
            .ds-hero-content {
                padding: 40px 0;
            }
            .ds-section {
                padding: var(--ds-section-padding-mobile);
            }
            .ds-section-header h2 {
                font-size: 1.7rem;
            }
            .ds-stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .ds-stat-number {
                font-size: 1.8rem;
            }
            .ds-advantage-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .ds-category-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .ds-news-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .ds-testimonial-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .ds-story-block {
                grid-template-columns: 1fr;
            }
            .ds-story-image {
                min-height: 220px;
            }
            .ds-story-text {
                padding: 24px 18px;
            }
            .ds-story-text h3 {
                font-size: 1.4rem;
            }
            .ds-cta-section {
                padding: 36px 20px;
            }
            .ds-cta-section h3 {
                font-size: 1.5rem;
            }
            .ds-footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .ds-partners-row {
                gap: 16px;
            }
            .ds-partner-item {
                padding: 14px 18px;
                font-size: 0.9rem;
            }
            .ds-brand-intro-card {
                padding: 28px 20px;
            }
            .ds-btn {
                padding: 11px 22px;
                font-size: 0.9rem;
            }
        }

        @media (max-width: 520px) {
            .ds-hero h1 {
                font-size: 1.7rem;
            }
            .ds-hero {
                min-height: 360px;
            }
            .ds-stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .ds-stat-card {
                padding: 20px 14px;
            }
            .ds-stat-number {
                font-size: 1.5rem;
            }
            .ds-advantage-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .ds-category-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .ds-category-card .card-img-wrap {
                height: 160px;
            }
            .ds-hero-btns {
                flex-direction: column;
                gap: 10px;
            }
            .ds-hero-btns .ds-btn {
                width: 100%;
                justify-content: center;
            }
            .ds-section-header h2 {
                font-size: 1.5rem;
            }
            .ds-footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* 桌面端导航特殊处理 */
        @media (min-width: 769px) {
            .ds-navbar .navbar-collapse {
                display: flex !important;
                flex-basis: auto;
                align-items: center;
                justify-content: space-between;
                width: 100%;
            }
            .ds-navbar .navbar-toggler {
                display: none;
            }
            .ds-nav-inner-desktop {
                display: flex;
                align-items: center;
                justify-content: space-between;
                width: 100%;
            }
            .ds-nav-group-left-desktop {
                display: flex;
                align-items: center;
                gap: 4px;
                list-style: none;
                margin: 0;
                padding: 0;
            }
            .ds-nav-group-right-desktop {
                display: flex;
                align-items: center;
                gap: 4px;
                list-style: none;
                margin: 0;
                padding: 0;
            }
            .ds-nav-logo-wrap-desktop {
                flex-shrink: 0;
                padding: 0 20px;
                text-align: center;
            }
        }

/* roulang page: category1 */
:root {
            --ds-primary: #1A3C5E;
            --ds-primary-light: #1F4D7A;
            --ds-primary-dark: #0F2A45;
            --ds-accent: #E8833A;
            --ds-accent-light: #F0A062;
            --ds-accent-dark: #C96B28;
            --ds-bg: #F7F8FA;
            --ds-bg-white: #FFFFFF;
            --ds-bg-light: #EDF1F5;
            --ds-bg-accent: #FFF7F0;
            --ds-text: #1E2A36;
            --ds-text-secondary: #5A6570;
            --ds-text-muted: #8B95A1;
            --ds-border: #DDE3EA;
            --ds-border-light: #EBEFF3;
            --ds-radius-sm: 8px;
            --ds-radius: 12px;
            --ds-radius-lg: 16px;
            --ds-radius-xl: 20px;
            --ds-shadow-sm: 0 1px 3px rgba(26, 60, 94, 0.06);
            --ds-shadow: 0 4px 16px rgba(26, 60, 94, 0.08);
            --ds-shadow-md: 0 8px 28px rgba(26, 60, 94, 0.10);
            --ds-shadow-lg: 0 14px 40px rgba(26, 60, 94, 0.13);
            --ds-shadow-xl: 0 20px 56px rgba(26, 60, 94, 0.16);
            --ds-transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --ds-font-sans: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
        }

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

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

        body {
            font-family: var(--ds-font-sans);
            line-height: 1.7;
            color: var(--ds-text);
            background-color: var(--ds-bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            letter-spacing: 0.01em;
        }

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

        a:hover {
            color: var(--ds-accent);
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        @media (max-width: 768px) {
            .container-custom {
                padding: 0 16px;
            }
        }

        /* ========== 导航栏 ========== */
        .ds-navbar {
            background: var(--ds-bg-white);
            border-bottom: 1px solid var(--ds-border-light);
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: var(--ds-shadow-sm);
            min-height: 64px;
            display: flex;
            align-items: center;
        }

        .ds-nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 20px;
        }

        .ds-nav-inner-desktop {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .ds-nav-group-left-desktop,
        .ds-nav-group-right-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
        }

        .ds-nav-group-left-desktop {
            justify-content: flex-end;
            padding-right: 16px;
        }

        .ds-nav-group-right-desktop {
            justify-content: flex-start;
            padding-left: 16px;
        }

        .ds-nav-logo-wrap {
            flex-shrink: 0;
            text-align: center;
        }

        .ds-nav-logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--ds-primary);
            letter-spacing: 0.03em;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .ds-nav-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: var(--ds-accent);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            line-height: 1;
        }

        .ds-nav-logo:hover {
            color: var(--ds-primary);
            opacity: 0.9;
        }

        .ds-nav-link {
            display: inline-block;
            padding: 10px 16px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--ds-text-secondary);
            border-radius: var(--ds-radius-sm);
            transition: all var(--ds-transition);
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        .ds-nav-link:hover {
            color: var(--ds-primary);
            background: var(--ds-bg-light);
        }

        .ds-nav-link.active,
        .ds-nav-link.nav-home.active {
            color: var(--ds-accent);
            font-weight: 600;
            background: var(--ds-bg-accent);
        }

        .navbar-toggler {
            border: none;
            padding: 8px 10px;
            color: var(--ds-primary);
            font-size: 1.3rem;
            background: transparent;
            border-radius: var(--ds-radius-sm);
            transition: all var(--ds-transition);
        }

        .navbar-toggler:hover {
            background: var(--ds-bg-light);
        }
        .navbar-toggler:focus {
            outline: 2px solid var(--ds-accent);
            outline-offset: 2px;
            box-shadow: none;
        }

        #navbarCollapse {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius);
            padding: 8px 4px;
            margin-top: 8px;
            box-shadow: var(--ds-shadow-md);
            border: 1px solid var(--ds-border-light);
        }

        #navbarCollapse .ds-nav-group {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        #navbarCollapse .ds-nav-link {
            display: block;
            width: 100%;
            padding: 11px 16px;
            border-radius: var(--ds-radius-sm);
        }

        @media (max-width: 991px) {
            .ds-navbar .container-custom {
                display: flex;
                align-items: center;
                justify-content: space-between;
                flex-wrap: wrap;
                padding-top: 10px;
                padding-bottom: 10px;
            }
            .ds-nav-logo-wrap.d-lg-none {
                flex-shrink: 0;
            }
            .navbar-toggler.d-lg-none {
                flex-shrink: 0;
                margin-left: auto;
            }
            #navbarCollapse {
                flex-basis: 100%;
                width: 100%;
            }
        }

        /* ========== 页面Banner ========== */
        .ds-page-banner {
            background: var(--ds-primary);
            background-image: linear-gradient(170deg, rgba(26, 60, 94, 0.92) 0%, rgba(15, 42, 69, 0.96) 100%), url('assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 60px 0 64px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .ds-page-banner::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            right: 0;
            height: 40px;
            background: var(--ds-bg);
            border-radius: 24px 24px 0 0;
            z-index: 1;
        }

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

        .ds-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }

        .ds-breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
            transition: color var(--ds-transition);
        }
        .ds-breadcrumb a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .ds-breadcrumb .separator {
            font-size: 0.7rem;
            opacity: 0.6;
        }
        .ds-breadcrumb .current {
            color: #fff;
            font-weight: 500;
        }

        .ds-page-banner h1 {
            font-size: 2.6rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            margin-bottom: 14px;
            line-height: 1.3;
        }

        .ds-page-banner .banner-subtitle {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .ds-page-banner {
                padding: 40px 0 48px;
            }
            .ds-page-banner h1 {
                font-size: 1.8rem;
            }
            .ds-page-banner .banner-subtitle {
                font-size: 0.95rem;
            }
        }

        /* ========== 板块通用 ========== */
        .ds-section {
            padding: 60px 0;
        }
        .ds-section-alt {
            background: var(--ds-bg-white);
        }
        .ds-section-title {
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--ds-text);
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }
        .ds-section-subtitle {
            font-size: 1rem;
            color: var(--ds-text-secondary);
            margin-bottom: 36px;
            max-width: 600px;
        }
        .ds-section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .ds-section-header .ds-section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        @media (max-width: 768px) {
            .ds-section {
                padding: 40px 0;
            }
            .ds-section-title {
                font-size: 1.4rem;
            }
            .ds-section-header {
                margin-bottom: 28px;
            }
        }

        /* ========== 统计卡片行 ========== */
        .ds-stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-top: -30px;
            position: relative;
            z-index: 5;
        }
        .ds-stat-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 22px 18px;
            text-align: center;
            box-shadow: var(--ds-shadow-md);
            border: 1px solid var(--ds-border-light);
            transition: all var(--ds-transition);
        }
        .ds-stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--ds-shadow-lg);
        }
        .ds-stat-card .stat-icon {
            font-size: 2rem;
            color: var(--ds-accent);
            margin-bottom: 10px;
        }
        .ds-stat-card .stat-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--ds-primary);
            line-height: 1.2;
        }
        .ds-stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--ds-text-secondary);
            margin-top: 4px;
        }

        @media (max-width: 992px) {
            .ds-stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .ds-stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .ds-stat-card {
                padding: 16px 12px;
            }
            .ds-stat-card .stat-number {
                font-size: 1.5rem;
            }
            .ds-stat-card .stat-icon {
                font-size: 1.5rem;
            }
        }

        /* ========== 功能卡片网格 ========== */
        .ds-card-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .ds-guide-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
            box-shadow: var(--ds-shadow);
            border: 1px solid var(--ds-border-light);
            transition: all var(--ds-transition);
            display: flex;
            flex-direction: column;
        }
        .ds-guide-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--ds-shadow-lg);
            border-color: var(--ds-accent-light);
        }
        .ds-guide-card .card-img-wrap {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .ds-guide-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .ds-guide-card:hover .card-img-wrap img {
            transform: scale(1.04);
        }
        .ds-guide-card .card-img-wrap .card-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            background: var(--ds-accent);
            color: #fff;
            font-size: 0.78rem;
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 20px;
            letter-spacing: 0.03em;
            z-index: 2;
        }
        .ds-guide-card .card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .ds-guide-card .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--ds-text);
            margin: 0;
            letter-spacing: 0.02em;
        }
        .ds-guide-card .card-desc {
            font-size: 0.93rem;
            color: var(--ds-text-secondary);
            line-height: 1.6;
            margin: 0;
            flex: 1;
        }
        .ds-guide-card .card-link {
            font-weight: 600;
            color: var(--ds-accent);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 5px;
            transition: gap var(--ds-transition);
        }
        .ds-guide-card .card-link:hover {
            gap: 9px;
            color: var(--ds-accent-dark);
        }

        @media (max-width: 768px) {
            .ds-card-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .ds-guide-card .card-img-wrap {
                height: 170px;
            }
        }

        /* ========== 步骤流程 ========== */
        .ds-steps-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            position: relative;
        }
        .ds-steps-list::before {
            content: '';
            position: absolute;
            left: 31px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--ds-border);
            border-radius: 2px;
        }
        .ds-step-item {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            position: relative;
        }
        .ds-step-num {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--ds-primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 2;
            box-shadow: 0 0 0 6px var(--ds-bg);
        }
        .ds-section-alt .ds-step-num {
            box-shadow: 0 0 0 6px var(--ds-bg-white);
        }
        .ds-step-content {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 20px 24px;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border-light);
            flex: 1;
            transition: all var(--ds-transition);
        }
        .ds-step-content:hover {
            box-shadow: var(--ds-shadow);
            border-color: var(--ds-accent-light);
        }
        .ds-step-content h4 {
            font-size: 1.08rem;
            font-weight: 700;
            color: var(--ds-text);
            margin: 0 0 6px;
        }
        .ds-step-content p {
            font-size: 0.93rem;
            color: var(--ds-text-secondary);
            margin: 0;
            line-height: 1.65;
        }
        .ds-step-content .step-meta {
            display: inline-block;
            margin-top: 8px;
            font-size: 0.82rem;
            color: var(--ds-accent);
            font-weight: 600;
            background: var(--ds-bg-accent);
            padding: 3px 10px;
            border-radius: 14px;
        }

        @media (max-width: 768px) {
            .ds-steps-list::before {
                left: 23px;
            }
            .ds-step-item {
                gap: 14px;
                padding: 14px 0;
            }
            .ds-step-num {
                width: 36px;
                height: 36px;
                font-size: 0.9rem;
            }
            .ds-step-content {
                padding: 14px 16px;
            }
        }

        /* ========== FAQ ========== */
        .ds-faq-wrap .accordion-item {
            border: 1px solid var(--ds-border-light);
            border-radius: var(--ds-radius) !important;
            margin-bottom: 10px;
            overflow: hidden;
            box-shadow: var(--ds-shadow-sm);
            background: var(--ds-bg-white);
        }
        .ds-faq-wrap .accordion-button {
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--ds-text);
            background: var(--ds-bg-white);
            padding: 16px 20px;
            box-shadow: none;
            border-radius: var(--ds-radius) !important;
            transition: all var(--ds-transition);
            letter-spacing: 0.02em;
        }
        .ds-faq-wrap .accordion-button:not(.collapsed) {
            color: var(--ds-accent);
            background: var(--ds-bg-accent);
            box-shadow: none;
        }
        .ds-faq-wrap .accordion-button:focus {
            outline: 2px solid var(--ds-accent);
            outline-offset: -2px;
            box-shadow: none;
            border-color: transparent;
        }
        .ds-faq-wrap .accordion-button::after {
            filter: brightness(0.4);
            transition: transform var(--ds-transition);
        }
        .ds-faq-wrap .accordion-body {
            padding: 10px 20px 20px;
            font-size: 0.93rem;
            color: var(--ds-text-secondary);
            line-height: 1.75;
            background: var(--ds-bg-white);
        }

        /* ========== CTA板块 ========== */
        .ds-cta-section {
            background: var(--ds-primary);
            background-image: linear-gradient(160deg, var(--ds-primary) 0%, var(--ds-primary-dark) 100%), url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            background-blend-mode: overlay;
            padding: 56px 0;
            text-align: center;
            color: #fff;
            border-radius: var(--ds-radius-xl);
            margin: 0 0 60px;
        }
        .ds-cta-section h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 10px;
            letter-spacing: 0.02em;
        }
        .ds-cta-section p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 24px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .ds-btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: 28px;
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.03em;
            transition: all var(--ds-transition);
            border: none;
            cursor: pointer;
            text-align: center;
        }
        .ds-btn-primary {
            background: var(--ds-accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(232, 131, 58, 0.35);
        }
        .ds-btn-primary:hover {
            background: var(--ds-accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(232, 131, 58, 0.45);
        }
        .ds-btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.7);
        }
        .ds-btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: #fff;
        }

        @media (max-width: 768px) {
            .ds-cta-section {
                padding: 40px 20px;
                margin: 0 0 40px;
                border-radius: var(--ds-radius-lg);
            }
            .ds-cta-section h3 {
                font-size: 1.3rem;
            }
        }

        /* ========== 图文区块 ========== */
        .ds-media-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .ds-media-block.reverse {
            direction: rtl;
        }
        .ds-media-block.reverse>* {
            direction: ltr;
        }
        .ds-media-block .media-img {
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
            box-shadow: var(--ds-shadow-md);
        }
        .ds-media-block .media-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
            border-radius: var(--ds-radius-lg);
            transition: transform 0.4s ease;
        }
        .ds-media-block .media-img:hover img {
            transform: scale(1.03);
        }
        .ds-media-block .media-text h3 {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--ds-text);
            margin-bottom: 10px;
            letter-spacing: 0.02em;
        }
        .ds-media-block .media-text p {
            font-size: 0.95rem;
            color: var(--ds-text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }
        .ds-media-block .media-text .highlight-list {
            list-style: none;
            padding: 0;
            margin: 14px 0 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .ds-media-block .media-text .highlight-list li {
            padding-left: 22px;
            position: relative;
            font-size: 0.92rem;
            color: var(--ds-text-secondary);
            line-height: 1.6;
        }
        .ds-media-block .media-text .highlight-list li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 8px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--ds-accent);
            flex-shrink: 0;
        }

        @media (max-width: 768px) {
            .ds-media-block {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .ds-media-block .media-text h3 {
                font-size: 1.2rem;
            }
        }

        /* ========== 页脚 ========== */
        .ds-footer {
            background: #0F2638;
            color: rgba(255, 255, 255, 0.8);
            padding: 50px 0 28px;
            font-size: 0.9rem;
            letter-spacing: 0.02em;
        }
        .ds-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .ds-footer-brand p {
            font-size: 0.88rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.65);
            margin: 10px 0 0;
            max-width: 300px;
        }
        .footer-logo {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.04em;
        }
        .footer-logo:hover {
            color: var(--ds-accent-light);
        }
        .ds-footer-social {
            display: flex;
            gap: 12px;
        }
        .ds-footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            transition: all var(--ds-transition);
        }
        .ds-footer-social a:hover {
            background: var(--ds-accent);
            color: #fff;
            transform: translateY(-2px);
        }
        .ds-footer-col h5 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.04em;
        }
        .ds-footer-col ul li {
            margin-bottom: 7px;
        }
        .ds-footer-col ul li a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.87rem;
            transition: color var(--ds-transition);
        }
        .ds-footer-col ul li a:hover {
            color: var(--ds-accent-light);
        }
        .ds-footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 20px;
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.5);
        }

        @media (max-width: 768px) {
            .ds-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .ds-footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .ds-footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        /* ========== 辅助工具类 ========== */
        .text-center {
            text-align: center;
        }
        .mt-0 {
            margin-top: 0;
        }
        .mb-0 {
            margin-bottom: 0;
        }

/* roulang page: category3 */
:root {
            --ds-primary: #1a56db;
            --ds-primary-dark: #1340a0;
            --ds-primary-light: #e8f0fe;
            --ds-accent: #f59e0b;
            --ds-accent-dark: #d97706;
            --ds-accent-light: #fef3c7;
            --ds-bg: #f8fafc;
            --ds-bg-white: #ffffff;
            --ds-bg-dark: #0f172a;
            --ds-bg-slate: #1e293b;
            --ds-text: #1e293b;
            --ds-text-secondary: #64748b;
            --ds-text-light: #94a3b8;
            --ds-text-white: #f1f5f9;
            --ds-border: #e2e8f0;
            --ds-border-light: #f1f5f9;
            --ds-radius-sm: 8px;
            --ds-radius: 12px;
            --ds-radius-lg: 16px;
            --ds-radius-xl: 20px;
            --ds-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --ds-shadow: 0 4px 14px rgba(0, 0, 0, 0.07), 0 2px 6px rgba(0, 0, 0, 0.04);
            --ds-shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10), 0 4px 12px rgba(0, 0, 0, 0.05);
            --ds-shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.12), 0 8px 20px rgba(0, 0, 0, 0.06);
            --ds-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --ds-font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
        }

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

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

        body {
            font-family: var(--ds-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--ds-text);
            background-color: var(--ds-bg);
            overflow-x: hidden;
            min-height: 100vh;
        }

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

        a:hover {
            color: var(--ds-primary);
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

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

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .container-custom {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== 导航栏 ========== */
        .ds-navbar {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--ds-border);
            padding: 0 24px;
            min-height: 64px;
            display: flex;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: var(--ds-shadow-sm);
            transition: box-shadow var(--ds-transition);
        }

        .ds-navbar.scrolled {
            box-shadow: var(--ds-shadow-lg);
        }

        .ds-nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
        }

        .ds-nav-inner-desktop {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .ds-nav-group-left-desktop,
        .ds-nav-group-right-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
        }

        .ds-nav-group-left-desktop {
            justify-content: flex-end;
            padding-right: 16px;
        }

        .ds-nav-group-right-desktop {
            justify-content: flex-start;
            padding-left: 16px;
        }

        .ds-nav-logo-wrap {
            flex-shrink: 0;
            text-align: center;
        }

        .ds-nav-logo-wrap-desktop {
            min-width: 120px;
        }

        .ds-nav-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--ds-text);
            letter-spacing: -0.01em;
            white-space: nowrap;
            transition: color var(--ds-transition);
        }

        .ds-nav-logo:hover {
            color: var(--ds-primary);
        }

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--ds-primary), #3b82f6);
            color: #ffffff;
            font-weight: 800;
            font-size: 1.1rem;
            border-radius: 10px;
            flex-shrink: 0;
            letter-spacing: 0;
        }

        .ds-nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--ds-text-secondary);
            transition: all var(--ds-transition);
            white-space: nowrap;
            position: relative;
        }

        .ds-nav-link:hover {
            color: var(--ds-primary);
            background: var(--ds-primary-light);
        }

        .ds-nav-link.active {
            color: var(--ds-primary);
            font-weight: 600;
            background: var(--ds-primary-light);
        }

        .ds-nav-link.nav-home.active {
            color: var(--ds-primary);
            font-weight: 600;
            background: var(--ds-primary-light);
        }

        .navbar-toggler {
            border: 1px solid var(--ds-border);
            border-radius: var(--ds-radius-sm);
            padding: 8px 14px;
            background: var(--ds-bg-white);
            color: var(--ds-text);
            font-size: 1.2rem;
            transition: all var(--ds-transition);
        }

        .navbar-toggler:hover {
            background: var(--ds-primary-light);
            border-color: var(--ds-primary);
            color: var(--ds-primary);
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.2);
            outline: none;
        }

        #navbarCollapse {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius);
            padding: 12px 8px;
            margin-top: 8px;
            box-shadow: var(--ds-shadow-lg);
            border: 1px solid var(--ds-border);
        }

        #navbarCollapse .ds-nav-link {
            display: flex;
            padding: 10px 16px;
            border-radius: 8px;
            width: 100%;
            margin: 2px 0;
        }

        @media (max-width: 991.98px) {
            .ds-navbar {
                padding: 0 16px;
                min-height: 58px;
            }
            .ds-nav-logo {
                font-size: 1.15rem;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.95rem;
                border-radius: 8px;
            }
            .ds-nav-inner {
                flex-wrap: wrap;
            }
        }

        /* ========== 页面Banner ========== */
        .page-banner {
            position: relative;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a56db 100%);
            padding: 64px 0 60px;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            z-index: 0;
        }

        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.65) 0%, rgba(26, 86, 219, 0.5) 100%);
            z-index: 1;
        }

        .page-banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
            color: #ffffff;
        }

        .page-banner-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.18);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 50px;
            padding: 6px 20px;
            font-size: 0.9rem;
            font-weight: 500;
            color: #fef3c7;
            margin-bottom: 18px;
            backdrop-filter: blur(4px);
        }

        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 14px;
            color: #ffffff;
            line-height: 1.2;
        }

        .page-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 620px;
            margin: 0 auto;
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .page-banner {
                padding: 48px 0 44px;
                min-height: 220px;
            }
            .page-banner h1 {
                font-size: 2rem;
            }
            .page-banner p {
                font-size: 1rem;
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.6rem;
            }
            .page-banner-badge {
                font-size: 0.8rem;
                padding: 4px 14px;
            }
        }

        /* ========== 通用板块 ========== */
        .section-padding {
            padding: 64px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 44px;
        }

        .section-header .section-badge {
            display: inline-block;
            background: var(--ds-accent-light);
            color: var(--ds-accent-dark);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 5px 16px;
            border-radius: 50px;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }

        .section-header h2 {
            font-size: 2.1rem;
            font-weight: 700;
            color: var(--ds-text);
            letter-spacing: -0.01em;
            margin-bottom: 10px;
            line-height: 1.3;
        }

        .section-header p {
            font-size: 1.05rem;
            color: var(--ds-text-secondary);
            max-width: 580px;
            margin: 0 auto;
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .section-padding {
                padding: 44px 0;
            }
            .section-header h2 {
                font-size: 1.7rem;
            }
            .section-header p {
                font-size: 0.95rem;
                padding: 0 12px;
            }
        }

        /* ========== 活动卡片 ========== */
        .activity-card {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
            box-shadow: var(--ds-shadow);
            transition: all var(--ds-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
            border: 1px solid var(--ds-border-light);
        }

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

        .activity-card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: #e8f0fe;
        }

        .activity-card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .activity-card:hover .activity-card-img-wrap img {
            transform: scale(1.04);
        }

        .activity-card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--ds-accent);
            color: #fff;
            font-weight: 700;
            font-size: 0.78rem;
            padding: 5px 12px;
            border-radius: 6px;
            letter-spacing: 0.02em;
            z-index: 2;
            box-shadow: 0 2px 8px rgba(245, 158, 11, 0.35);
        }

        .activity-card-badge.ongoing {
            background: #10b981;
            box-shadow: 0 2px 8px rgba(16, 185, 129, 0.35);
        }

        .activity-card-badge.upcoming {
            background: #6366f1;
            box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
        }

        .activity-card-badge.ended {
            background: #94a3b8;
            box-shadow: 0 2px 8px rgba(148, 163, 184, 0.3);
        }

        .activity-card-body {
            padding: 20px 20px 16px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .activity-card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--ds-text);
            margin-bottom: 6px;
            line-height: 1.4;
            letter-spacing: -0.01em;
        }

        .activity-card-body .activity-meta {
            display: flex;
            gap: 14px;
            font-size: 0.85rem;
            color: var(--ds-text-secondary);
            margin-bottom: 10px;
            flex-wrap: wrap;
        }

        .activity-card-body .activity-meta span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .activity-card-body .activity-meta i {
            color: var(--ds-primary);
            font-size: 0.8rem;
        }

        .activity-card-body p {
            font-size: 0.93rem;
            color: var(--ds-text-secondary);
            line-height: 1.6;
            margin-bottom: 14px;
            flex: 1;
        }

        .activity-card-footer {
            padding: 12px 20px 18px;
            border-top: 1px solid var(--ds-border-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 10px;
        }

        .activity-card-footer .participants {
            font-size: 0.85rem;
            color: var(--ds-text-secondary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .activity-card-footer .participants i {
            color: var(--ds-accent);
        }

        .btn-activity {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 600;
            background: var(--ds-primary);
            color: #fff;
            border: none;
            transition: all var(--ds-transition);
            white-space: nowrap;
        }

        .btn-activity:hover {
            background: var(--ds-primary-dark);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
            transform: translateY(-1px);
        }

        .btn-activity-outline {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 600;
            background: transparent;
            color: var(--ds-primary);
            border: 1.5px solid var(--ds-primary);
            transition: all var(--ds-transition);
            white-space: nowrap;
        }

        .btn-activity-outline:hover {
            background: var(--ds-primary-light);
            color: var(--ds-primary-dark);
            border-color: var(--ds-primary-dark);
        }

        @media (max-width: 768px) {
            .activity-card-body {
                padding: 16px 14px 12px;
            }
            .activity-card-body h3 {
                font-size: 1.05rem;
            }
            .activity-card-footer {
                padding: 10px 14px 14px;
                flex-wrap: wrap;
            }
        }

        /* ========== 活动分类标签 ========== */
        .category-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-bottom: 36px;
        }

        .category-tab {
            padding: 10px 22px;
            border-radius: 50px;
            font-size: 0.93rem;
            font-weight: 500;
            background: var(--ds-bg-white);
            border: 1.5px solid var(--ds-border);
            color: var(--ds-text-secondary);
            cursor: pointer;
            transition: all var(--ds-transition);
            white-space: nowrap;
        }

        .category-tab:hover {
            border-color: var(--ds-primary);
            color: var(--ds-primary);
            background: var(--ds-primary-light);
        }

        .category-tab.active {
            background: var(--ds-primary);
            color: #fff;
            border-color: var(--ds-primary);
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
        }

        @media (max-width: 520px) {
            .category-tabs {
                gap: 6px;
            }
            .category-tab {
                padding: 7px 15px;
                font-size: 0.82rem;
            }
        }

        /* ========== 数据统计条 ========== */
        .stats-strip {
            background: var(--ds-bg-white);
            border-top: 1px solid var(--ds-border);
            border-bottom: 1px solid var(--ds-border);
            padding: 28px 0;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }

        .stat-item .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--ds-primary);
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 6px;
        }

        .stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--ds-text-secondary);
            font-weight: 500;
        }

        .stat-divider {
            width: 1px;
            background: var(--ds-border);
            align-self: stretch;
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
            .stat-item .stat-number {
                font-size: 1.7rem;
            }
            .stat-divider {
                display: none;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .stat-item .stat-number {
                font-size: 1.4rem;
            }
            .stat-item .stat-label {
                font-size: 0.8rem;
            }
        }

        /* ========== 往期回顾 ========== */
        .past-event-card {
            display: flex;
            gap: 20px;
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 20px;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border-light);
            transition: all var(--ds-transition);
            align-items: center;
        }

        .past-event-card:hover {
            box-shadow: var(--ds-shadow);
            border-color: var(--ds-border);
        }

        .past-event-thumb {
            width: 100px;
            height: 70px;
            border-radius: var(--ds-radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: #e8f0fe;
        }

        .past-event-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .past-event-info {
            flex: 1;
            min-width: 0;
        }

        .past-event-info h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--ds-text);
            margin-bottom: 4px;
            line-height: 1.3;
        }

        .past-event-info .past-event-meta {
            font-size: 0.82rem;
            color: var(--ds-text-secondary);
        }

        .past-event-info .past-event-meta i {
            margin-right: 4px;
            color: var(--ds-primary);
        }

        @media (max-width: 520px) {
            .past-event-card {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .past-event-thumb {
                width: 100%;
                height: 120px;
            }
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 44px 32px;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border-light);
        }

        .faq-item {
            border-bottom: 1px solid var(--ds-border-light);
            padding: 18px 0;
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--ds-text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: color var(--ds-transition);
            user-select: none;
        }

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

        .faq-question i {
            color: var(--ds-text-light);
            transition: transform var(--ds-transition);
            font-size: 0.9rem;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding-top 0.4s ease;
            color: var(--ds-text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            padding-top: 0;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
            padding-top: 10px;
        }

        @media (max-width: 768px) {
            .faq-section {
                padding: 28px 18px;
            }
            .faq-question {
                font-size: 0.95rem;
            }
            .faq-answer {
                font-size: 0.88rem;
            }
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1a56db 100%);
            border-radius: var(--ds-radius-xl);
            padding: 52px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: 0;
        }

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

        .cta-section h3 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 520px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }

        .btn-cta-lg {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 700;
            background: var(--ds-accent);
            color: #1e293b;
            border: none;
            transition: all var(--ds-transition);
            letter-spacing: 0.01em;
        }

        .btn-cta-lg:hover {
            background: #fbbf24;
            color: #0f172a;
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.45);
            transform: translateY(-2px);
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 36px 20px;
                border-radius: var(--ds-radius-lg);
            }
            .cta-section h3 {
                font-size: 1.4rem;
            }
            .btn-cta-lg {
                padding: 12px 24px;
                font-size: 0.95rem;
            }
        }

        /* ========== 页脚 ========== */
        .ds-footer {
            background: var(--ds-bg-dark);
            color: var(--ds-text-white);
            padding: 52px 0 28px;
            margin-top: 0;
        }

        .ds-footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 32px;
        }

        .ds-footer-brand p {
            font-size: 0.9rem;
            color: #94a3b8;
            line-height: 1.7;
            margin-top: 12px;
        }

        .footer-logo {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            letter-spacing: -0.01em;
        }

        .footer-logo:hover {
            color: #60a5fa;
        }

        .ds-footer-social {
            display: flex;
            gap: 14px;
        }

        .ds-footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: #cbd5e1;
            font-size: 1rem;
            transition: all var(--ds-transition);
        }

        .ds-footer-social a:hover {
            background: var(--ds-primary);
            color: #fff;
        }

        .ds-footer-col h5 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #e2e8f0;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }

        .ds-footer-col ul li {
            margin-bottom: 8px;
        }

        .ds-footer-col ul li a {
            font-size: 0.88rem;
            color: #94a3b8;
            transition: color var(--ds-transition);
        }

        .ds-footer-col ul li a:hover {
            color: #60a5fa;
        }

        .ds-footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.82rem;
            color: #64748b;
        }

        @media (max-width: 992px) {
            .ds-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 576px) {
            .ds-footer-grid {
                grid-template-columns: 1fr;
                gap: 22px;
            }
            .ds-footer {
                padding: 36px 0 20px;
            }
        }

        /* ========== 亮点区块背景 ========== */
        .highlight-bg {
            background: var(--ds-bg-white);
            border-radius: var(--ds-radius-lg);
            padding: 36px 28px;
            box-shadow: var(--ds-shadow-sm);
            border: 1px solid var(--ds-border-light);
        }

        @media (max-width: 768px) {
            .highlight-bg {
                padding: 24px 16px;
            }
        }

        /* ========== 响应式补充 ========== */
        @media (max-width: 991.98px) {
            .container-custom {
                padding: 0 18px;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding: 0 14px;
            }
        }

/* roulang page: category2 */
/* ============ 设计变量 ============ */
        :root {
            --ds-primary: #1a56db;
            --ds-primary-dark: #1347b8;
            --ds-primary-light: #e8f0fe;
            --ds-accent: #f59e0b;
            --ds-accent-dark: #d97706;
            --ds-accent-light: #fef3c7;
            --ds-bg: #f8fafc;
            --ds-bg-white: #ffffff;
            --ds-bg-dark: #0f172a;
            --ds-bg-section-alt: #f1f5f9;
            --ds-text: #1e293b;
            --ds-text-secondary: #475569;
            --ds-text-weak: #64748b;
            --ds-text-light: #94a3b8;
            --ds-border: #e2e8f0;
            --ds-border-light: #f1f5f9;
            --ds-radius-sm: 8px;
            --ds-radius: 12px;
            --ds-radius-lg: 16px;
            --ds-radius-xl: 20px;
            --ds-shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.04);
            --ds-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --ds-shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --ds-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.10);
            --ds-shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
            --ds-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --ds-font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

        /* ============ 基础 Reset ============ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

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

        body {
            font-family: var(--ds-font-sans);
            background-color: var(--ds-bg);
            color: var(--ds-text);
            line-height: 1.7;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

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

        a:hover {
            color: var(--ds-primary);
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            margin-top: 0;
            color: var(--ds-text);
            font-weight: 700;
            line-height: 1.35;
        }

        p {
            margin-top: 0;
            margin-bottom: 1rem;
            color: var(--ds-text-secondary);
        }

        /* ============ 容器 ============ */
        .container-custom {
            width: 100%;
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        @media (max-width: 768px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ============ 导航系统 ============ */
        .ds-navbar {
            background: var(--ds-bg-white);
            border-bottom: 1px solid var(--ds-border);
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: var(--ds-shadow-xs);
            min-height: 64px;
            display: flex;
            align-items: center;
        }

        .ds-navbar .container-custom {
            display: flex;
            align-items: center;
            width: 100%;
            position: relative;
        }

        .ds-nav-inner {
            display: flex;
            align-items: center;
            width: 100%;
            justify-content: space-between;
        }

        .ds-nav-inner-desktop {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .ds-nav-group-left-desktop,
        .ds-nav-group-right-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
        }

        .ds-nav-group-left-desktop {
            justify-content: flex-end;
            padding-right: 20px;
        }

        .ds-nav-group-right-desktop {
            justify-content: flex-start;
            padding-left: 20px;
        }

        .ds-nav-logo-wrap {
            flex-shrink: 0;
            text-align: center;
        }

        .ds-nav-logo-wrap-desktop {
            flex-shrink: 0;
        }

        .ds-nav-logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--ds-text);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            letter-spacing: -0.01em;
            white-space: nowrap;
            transition: color var(--ds-transition);
        }

        .ds-nav-logo:hover {
            color: var(--ds-primary);
        }

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: var(--ds-primary);
            color: #fff;
            border-radius: var(--ds-radius-sm);
            font-size: 1rem;
            font-weight: 700;
            letter-spacing: 0;
        }

        .ds-nav-link {
            display: inline-flex;
            align-items: center;
            padding: 10px 16px;
            border-radius: var(--ds-radius-sm);
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--ds-text-secondary);
            transition: all var(--ds-transition);
            white-space: nowrap;
            position: relative;
        }

        .ds-nav-link:hover {
            color: var(--ds-primary);
            background: var(--ds-primary-light);
        }

        .ds-nav-link.active,
        .ds-nav-link.nav-active {
            color: var(--ds-primary);
            font-weight: 600;
            background: var(--ds-primary-light);
        }

        .ds-nav-link.nav-home {
            font-weight: 500;
        }

        .ds-nav-link.nav-home.active,
        .ds-nav-link.nav-home.nav-active {
            font-weight: 600;
            color: var(--ds-primary);
            background: var(--ds-primary-light);
        }

        .navbar-toggler {
            border: 1px solid var(--ds-border);
            border-radius: var(--ds-radius-sm);
            padding: 8px 12px;
            background: var(--ds-bg-white);
            color: var(--ds-text);
            font-size: 1.2rem;
            transition: all var(--ds-transition);
            margin-left: auto;
        }

        .navbar-toggler:hover {
            background: var(--ds-bg-section-alt);
            border-color: var(--ds-primary);
            color: var(--ds-primary);
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
            outline: none;
        }

        #navbarCollapse {
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: var(--ds-bg-white);
            border-bottom: 2px solid var(--ds-border);
            box-shadow: var(--ds-shadow-md);
            border-radius: 0 0 var(--ds-radius) var(--ds-radius);
            padding: 8px 0;
            z-index: 1040;
        }

        #navbarCollapse .ds-nav-group {
            padding: 8px 16px;
            gap: 2px;
        }

        #navbarCollapse .ds-nav-link {
            display: block;
            width: 100%;
            padding: 12px 16px;
            border-radius: var(--ds-radius-sm);
            font-size: 1rem;
        }

        @media (max-width: 991.98px) {
            .ds-navbar {
                min-height: 56px;
            }
            .ds-nav-logo {
                font-size: 1.2rem;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.85rem;
            }
        }

        /* ============ 内页 Banner ============ */
        .ds-inner-banner {
            position: relative;
            padding: 60px 0 56px;
            background: var(--ds-bg-dark);
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            color: #ffffff;
            overflow: hidden;
        }

        .ds-inner-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.72) 50%, rgba(26, 86, 219, 0.55) 100%);
            z-index: 1;
        }

        .ds-inner-banner .container-custom {
            position: relative;
            z-index: 2;
        }

        .ds-inner-banner .banner-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 0.02em;
            margin-bottom: 16px;
        }

        .ds-inner-banner h1 {
            color: #ffffff;
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            line-height: 1.25;
        }

        .ds-inner-banner .banner-subtitle {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.1rem;
            max-width: 620px;
            line-height: 1.7;
        }

        .ds-inner-banner .banner-meta-row {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 20px;
            color: rgba(255, 255, 255, 0.75);
            font-size: 0.9rem;
        }

        .ds-inner-banner .banner-meta-row span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        @media (max-width: 768px) {
            .ds-inner-banner {
                padding: 40px 0 36px;
            }
            .ds-inner-banner h1 {
                font-size: 1.8rem;
            }
            .ds-inner-banner .banner-subtitle {
                font-size: 0.95rem;
            }
        }

        /* ============ 板块间距 ============ */
        .ds-section {
            padding: 64px 0;
        }

        .ds-section-alt {
            background: var(--ds-bg-section-alt);
        }

        .ds-section-white {
            background: var(--ds-bg-white);
        }

        .ds-section-dark {
            background: var(--ds-bg-dark);
            color: #fff;
        }

        .ds-section-dark h2,
        .ds-section-dark h3 {
            color: #fff;
        }

        .ds-section-dark p {
            color: rgba(255, 255, 255, 0.75);
        }

        @media (max-width: 768px) {
            .ds-section {
                padding: 40px 0;
            }
        }

        /* ============ 板块标题 ============ */
        .ds-section-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .ds-section-header h2 {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            margin-bottom: 10px;
            color: var(--ds-text);
        }

        .ds-section-header .section-line {
            display: inline-block;
            width: 48px;
            height: 4px;
            background: var(--ds-primary);
            border-radius: 2px;
            margin-bottom: 12px;
        }

        .ds-section-header p {
            color: var(--ds-text-weak);
            font-size: 1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        /* ============ 统计卡片 ============ */
        .ds-stat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .ds-stat-card {
            background: var(--ds-bg-white);
            border: 1px solid var(--ds-border);
            border-radius: var(--ds-radius);
            padding: 28px 22px;
            text-align: center;
            transition: all var(--ds-transition);
            box-shadow: var(--ds-shadow-xs);
            position: relative;
            overflow: hidden;
        }

        .ds-stat-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--ds-primary);
            opacity: 0;
            transition: opacity var(--ds-transition);
        }

        .ds-stat-card:hover {
            box-shadow: var(--ds-shadow);
            transform: translateY(-3px);
            border-color: var(--ds-primary);
        }

        .ds-stat-card:hover::after {
            opacity: 1;
        }

        .ds-stat-card .stat-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            border-radius: var(--ds-radius-sm);
            background: var(--ds-primary-light);
            color: var(--ds-primary);
            font-size: 1.4rem;
            margin-bottom: 14px;
        }

        .ds-stat-card .stat-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--ds-text);
            letter-spacing: -0.02em;
            line-height: 1.2;
        }

        .ds-stat-card .stat-value .unit {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--ds-text-weak);
            margin-left: 2px;
        }

        .ds-stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--ds-text-weak);
            margin-top: 6px;
        }

        @media (max-width: 992px) {
            .ds-stat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        @media (max-width: 520px) {
            .ds-stat-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .ds-stat-card {
                padding: 20px 14px;
            }
            .ds-stat-card .stat-value {
                font-size: 1.5rem;
            }
        }

        /* ============ 图文区块 ============ */
        .ds-media-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .ds-media-block.reverse {
            direction: rtl;
        }
        .ds-media-block.reverse>* {
            direction: ltr;
        }

        .ds-media-block .media-image-wrap {
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
            box-shadow: var(--ds-shadow-md);
        }

        .ds-media-block .media-image-wrap img {
            width: 100%;
            height: auto;
            object-fit: cover;
            aspect-ratio: 4/3;
        }

        .ds-media-block .media-content h3 {
            font-size: 1.55rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--ds-text);
        }

        .ds-media-block .media-content p {
            color: var(--ds-text-secondary);
            line-height: 1.75;
            margin-bottom: 16px;
        }

        .ds-media-block .media-content .media-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .ds-tag {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 50px;
            font-size: 0.82rem;
            font-weight: 500;
            background: var(--ds-primary-light);
            color: var(--ds-primary);
            border: 1px solid transparent;
            transition: all var(--ds-transition);
        }

        .ds-tag:hover {
            background: var(--ds-primary);
            color: #fff;
            border-color: var(--ds-primary);
        }

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

        .ds-tag-accent:hover {
            background: var(--ds-accent);
            color: #fff;
        }

        @media (max-width: 768px) {
            .ds-media-block {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .ds-media-block.reverse {
                direction: ltr;
            }
            .ds-media-block .media-image-wrap img {
                aspect-ratio: 16/10;
            }
        }

        /* ============ 报告列表卡片 ============ */
        .ds-report-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .ds-report-card {
            background: var(--ds-bg-white);
            border: 1px solid var(--ds-border);
            border-radius: var(--ds-radius);
            padding: 24px;
            transition: all var(--ds-transition);
            box-shadow: var(--ds-shadow-xs);
            display: flex;
            flex-direction: column;
        }

        .ds-report-card:hover {
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-4px);
            border-color: var(--ds-primary);
        }

        .ds-report-card .report-thumb {
            border-radius: var(--ds-radius-sm);
            overflow: hidden;
            margin-bottom: 14px;
            aspect-ratio: 16/10;
            background: var(--ds-bg-section-alt);
        }

        .ds-report-card .report-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .ds-report-card .report-date {
            font-size: 0.8rem;
            color: var(--ds-text-weak);
            margin-bottom: 6px;
        }

        .ds-report-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--ds-text);
            line-height: 1.4;
        }

        .ds-report-card p {
            font-size: 0.9rem;
            color: var(--ds-text-secondary);
            flex-grow: 1;
            margin-bottom: 14px;
            line-height: 1.6;
        }

        .ds-report-card .report-link {
            font-weight: 600;
            color: var(--ds-primary);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--ds-transition);
        }

        .ds-report-card .report-link:hover {
            gap: 8px;
            color: var(--ds-primary-dark);
        }

        @media (max-width: 992px) {
            .ds-report-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        @media (max-width: 520px) {
            .ds-report-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
        }

        /* ============ FAQ ============ */
        .ds-faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .ds-faq-item {
            background: var(--ds-bg-white);
            border: 1px solid var(--ds-border);
            border-radius: var(--ds-radius);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--ds-transition);
            box-shadow: var(--ds-shadow-xs);
        }

        .ds-faq-item:hover {
            box-shadow: var(--ds-shadow);
            border-color: #cbd5e1;
        }

        .ds-faq-item .faq-question {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--ds-text);
            transition: color var(--ds-transition);
            user-select: none;
            gap: 12px;
        }

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

        .ds-faq-item .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--ds-bg-section-alt);
            color: var(--ds-text-weak);
            font-size: 0.75rem;
            transition: all var(--ds-transition);
        }

        .ds-faq-item .faq-answer {
            padding: 0 22px 18px;
            color: var(--ds-text-secondary);
            font-size: 0.925rem;
            line-height: 1.75;
            display: none;
        }

        .ds-faq-item.open .faq-answer {
            display: block;
        }

        .ds-faq-item.open .faq-question {
            color: var(--ds-primary);
        }

        .ds-faq-item.open .faq-icon {
            background: var(--ds-primary);
            color: #fff;
            transform: rotate(45deg);
        }

        /* ============ CTA 区域 ============ */
        .ds-cta-section {
            background: linear-gradient(135deg, #1a56db 0%, #1347b8 50%, #0f3d99 100%);
            color: #fff;
            text-align: center;
            padding: 56px 0;
            border-radius: 0;
        }

        .ds-cta-section h2 {
            color: #fff;
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 10px;
        }

        .ds-cta-section p {
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 24px;
            font-size: 1rem;
        }

        .ds-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--ds-transition);
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }

        .ds-btn-primary {
            background: #ffffff;
            color: var(--ds-primary);
            box-shadow: var(--ds-shadow);
        }

        .ds-btn-primary:hover {
            background: #f1f5f9;
            color: var(--ds-primary-dark);
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-2px);
        }

        .ds-btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.6);
        }

        .ds-btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        .ds-btn-accent {
            background: var(--ds-accent);
            color: #fff;
            box-shadow: var(--ds-shadow);
        }

        .ds-btn-accent:hover {
            background: var(--ds-accent-dark);
            color: #fff;
            box-shadow: var(--ds-shadow-md);
            transform: translateY(-2px);
        }

        .ds-btn-lg {
            padding: 14px 36px;
            font-size: 1rem;
        }

        .ds-btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }

        .ds-btn:focus-visible {
            outline: 3px solid rgba(26, 86, 219, 0.4);
            outline-offset: 2px;
        }

        /* ============ 页脚 ============ */
        .ds-footer {
            background: var(--ds-bg-dark);
            color: #cbd5e1;
            padding: 48px 0 24px;
            font-size: 0.9rem;
        }

        .ds-footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
        }

        .ds-footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            display: block;
            margin-bottom: 10px;
        }

        .ds-footer-brand p {
            color: #94a3b8;
            font-size: 0.85rem;
            line-height: 1.7;
            margin-bottom: 0;
        }

        .ds-footer-social {
            display: flex;
            gap: 12px;
        }

        .ds-footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: #cbd5e1;
            font-size: 0.95rem;
            transition: all var(--ds-transition);
        }

        .ds-footer-social a:hover {
            background: var(--ds-primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .ds-footer-col h5 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 14px;
            letter-spacing: 0.01em;
        }

        .ds-footer-col ul li {
            margin-bottom: 8px;
        }

        .ds-footer-col ul li a {
            color: #94a3b8;
            font-size: 0.85rem;
            transition: color var(--ds-transition);
        }

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

        .ds-footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 32px;
            padding-top: 18px;
            text-align: center;
            color: #64748b;
            font-size: 0.8rem;
        }

        @media (max-width: 768px) {
            .ds-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .ds-footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .ds-footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .ds-footer-brand {
                grid-column: auto;
            }
        }

        /* ============ 工具类 ============ */
        .text-accent {
            color: var(--ds-accent);
        }
        .text-primary {
            color: var(--ds-primary);
        }
        .fw-800 {
            font-weight: 800;
        }
        .fw-700 {
            font-weight: 700;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-0 {
            margin-top: 0;
        }
        .text-center {
            text-align: center;
        }

        /* ============ 焦点高亮数字行 ============ */
        .ds-highlight-row {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
            padding: 20px 0;
        }
        .ds-highlight-row .highlight-item {
            text-align: center;
            padding: 0 20px;
            border-right: 1px solid var(--ds-border);
        }
        .ds-highlight-row .highlight-item:last-child {
            border-right: none;
        }
        .ds-highlight-row .highlight-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--ds-primary);
            letter-spacing: -0.02em;
        }
        .ds-highlight-row .highlight-label {
            font-size: 0.85rem;
            color: var(--ds-text-weak);
        }
        @media (max-width: 768px) {
            .ds-highlight-row .highlight-item {
                border-right: none;
                padding: 10px 16px;
                flex: 1 1 40%;
            }
            .ds-highlight-row .highlight-num {
                font-size: 1.6rem;
            }
        }

        /* ============ 面包屑 ============ */
        .ds-breadcrumb {
            display: flex;
            gap: 8px;
            align-items: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 8px;
            flex-wrap: wrap;
        }
        .ds-breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
        }
        .ds-breadcrumb a:hover {
            color: #fff;
        }
        .ds-breadcrumb .separator {
            color: rgba(255, 255, 255, 0.4);
        }
        .ds-breadcrumb .current {
            color: #fff;
            font-weight: 500;
        }

/* roulang page: category4 */
:root {
            --ds-primary: #1a56db;
            --ds-primary-dark: #1040b0;
            --ds-primary-light: #e8f0fe;
            --ds-accent: #f97316;
            --ds-accent-light: #fff7ed;
            --ds-bg: #f8fafc;
            --ds-white: #ffffff;
            --ds-text: #1e293b;
            --ds-text-secondary: #64748b;
            --ds-text-muted: #94a3b8;
            --ds-border: #e2e8f0;
            --ds-border-light: #f1f5f9;
            --ds-radius-sm: 8px;
            --ds-radius: 12px;
            --ds-radius-lg: 16px;
            --ds-radius-xl: 20px;
            --ds-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --ds-shadow: 0 4px 16px rgba(0, 0, 0, 0.07), 0 2px 6px rgba(0, 0, 0, 0.04);
            --ds-shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.10), 0 4px 12px rgba(0, 0, 0, 0.05);
            --ds-shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.12), 0 8px 20px rgba(0, 0, 0, 0.06);
            --ds-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --ds-font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --ds-section-gap: 80px;
            --ds-section-gap-sm: 50px;
        }

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

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

        body {
            font-family: var(--ds-font-sans);
            background-color: var(--ds-bg);
            color: var(--ds-text);
            line-height: 1.7;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            font-size: 16px;
        }

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

        a:hover {
            color: var(--ds-primary);
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container-custom {
                padding: 0 16px;
            }
            :root {
                --ds-section-gap: 50px;
                --ds-section-gap-sm: 32px;
            }
        }

        /* ========== NAVBAR ========== */
        .ds-navbar {
            background: var(--ds-white);
            border-bottom: 1px solid var(--ds-border);
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
            min-height: 64px;
        }

        .ds-nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            min-height: 64px;
        }

        .ds-nav-inner-desktop {
            display: flex;
            align-items: center;
            width: 100%;
            justify-content: space-between;
        }

        .ds-nav-group-left-desktop,
        .ds-nav-group-right-desktop {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .ds-nav-group-left-desktop {
            flex: 0 0 auto;
        }
        .ds-nav-group-right-desktop {
            flex: 0 0 auto;
        }

        .ds-nav-logo-wrap {
            flex: 0 0 auto;
            text-align: center;
        }
        .ds-nav-logo-wrap-desktop {
            padding: 0 20px;
        }

        .ds-nav-logo {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--ds-text);
            white-space: nowrap;
            letter-spacing: -0.01em;
            transition: color var(--ds-transition);
        }
        .ds-nav-logo:hover {
            color: var(--ds-primary);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--ds-primary);
            color: #fff;
            border-radius: var(--ds-radius-sm);
            font-size: 1.1rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .ds-nav-link {
            display: inline-block;
            padding: 10px 16px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--ds-text-secondary);
            border-radius: var(--ds-radius-sm);
            transition: all var(--ds-transition);
            position: relative;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .ds-nav-link:hover {
            color: var(--ds-primary);
            background: var(--ds-primary-light);
        }
        .ds-nav-link.active {
            color: var(--ds-primary);
            font-weight: 600;
            background: var(--ds-primary-light);
        }
        .ds-nav-link.nav-home {
            font-weight: 500;
        }

        .navbar-toggler {
            border: 1px solid var(--ds-border);
            border-radius: var(--ds-radius-sm);
            padding: 8px 12px;
            font-size: 1.3rem;
            color: var(--ds-text);
            background: var(--ds-white);
            transition: all var(--ds-transition);
        }
        .navbar-toggler:hover {
            background: var(--ds-primary-light);
            color: var(--ds-primary);
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
            outline: none;
        }

        #navbarCollapse {
            background: var(--ds-white);
            border-top: 1px solid var(--ds-border);
            padding: 12px 0;
            margin-top: 0;
        }
        #navbarCollapse .ds-nav-group {
            display: flex;
            flex-direction: column;
            gap: 2px;
            padding: 0 12px;
        }
        #navbarCollapse .ds-nav-link {
            display: block;
            padding: 12px 16px;
            font-size: 1rem;
            border-radius: var(--ds-radius-sm);
        }

        @media (max-width: 991px) {
            .ds-nav-inner {
                flex-wrap: wrap;
                justify-content: space-between;
                padding: 8px 0;
            }
            .ds-nav-logo-wrap {
                order: 1;
            }
            .navbar-toggler {
                order: 2;
                margin-left: auto;
            }
            #navbarCollapse {
                order: 3;
                width: 100%;
                flex-basis: 100%;
            }
        }

        /* ========== HERO BANNER ========== */
        .ds-hero-banner {
            position: relative;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a3c6e 100%);
            min-height: 420px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .ds-hero-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            z-index: 0;
        }
        .ds-hero-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.55) 0%, rgba(26, 60, 110, 0.7) 100%);
            z-index: 1;
        }
        .ds-hero-content {
            position: relative;
            z-index: 2;
            padding: 60px 0;
            color: #fff;
        }
        .ds-hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            letter-spacing: 0.03em;
            margin-bottom: 18px;
        }
        .ds-hero-banner h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            line-height: 1.2;
        }
        .ds-hero-banner .hero-subtitle {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 650px;
            line-height: 1.7;
            margin-bottom: 28px;
        }
        .ds-hero-stats-row {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
        }
        .ds-hero-stat-item {
            text-align: center;
            min-width: 80px;
        }
        .ds-hero-stat-item .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1;
        }
        .ds-hero-stat-item .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 4px;
        }
        @media (max-width: 768px) {
            .ds-hero-banner {
                min-height: 340px;
            }
            .ds-hero-banner h1 {
                font-size: 2rem;
            }
            .ds-hero-banner .hero-subtitle {
                font-size: 1rem;
            }
            .ds-hero-stats-row {
                gap: 20px;
            }
            .ds-hero-stat-item .stat-num {
                font-size: 1.5rem;
            }
        }

        /* ========== SECTION COMMON ========== */
        .ds-section {
            padding: var(--ds-section-gap) 0;
        }
        .ds-section-sm {
            padding: var(--ds-section-gap-sm) 0;
        }
        .ds-section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--ds-primary);
            background: var(--ds-primary-light);
            padding: 6px 16px;
            border-radius: 50px;
            letter-spacing: 0.04em;
            margin-bottom: 12px;
            text-transform: uppercase;
        }
        .ds-section-title {
            font-size: 2.2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 14px;
            color: var(--ds-text);
            line-height: 1.3;
        }
        .ds-section-desc {
            font-size: 1.05rem;
            color: var(--ds-text-secondary);
            max-width: 680px;
            line-height: 1.7;
            margin-bottom: 36px;
        }
        @media (max-width: 768px) {
            .ds-section-title {
                font-size: 1.6rem;
            }
            .ds-section-desc {
                font-size: 0.95rem;
            }
        }

        /* ========== CARDS ========== */
        .ds-card {
            background: var(--ds-white);
            border-radius: var(--ds-radius-lg);
            padding: 28px;
            border: 1px solid var(--ds-border-light);
            box-shadow: var(--ds-shadow-sm);
            transition: all var(--ds-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .ds-card:hover {
            box-shadow: var(--ds-shadow-lg);
            transform: translateY(-3px);
            border-color: var(--ds-border);
        }
        .ds-card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--ds-radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 16px;
            flex-shrink: 0;
        }
        .ds-card-icon.blue {
            background: #eff6ff;
            color: #3b82f6;
        }
        .ds-card-icon.orange {
            background: #fff7ed;
            color: #f97316;
        }
        .ds-card-icon.green {
            background: #f0fdf4;
            color: #22c55e;
        }
        .ds-card-icon.purple {
            background: #faf5ff;
            color: #a855f7;
        }
        .ds-card-icon.teal {
            background: #f0fdfa;
            color: #14b8a6;
        }
        .ds-card-icon.rose {
            background: #fff1f2;
            color: #f43f5e;
        }
        .ds-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--ds-text);
        }
        .ds-card p {
            font-size: 0.92rem;
            color: var(--ds-text-secondary);
            line-height: 1.65;
            margin: 0;
            flex-grow: 1;
        }

        /* ========== COMMUNITY POST CARD ========== */
        .ds-post-card {
            background: var(--ds-white);
            border-radius: var(--ds-radius-lg);
            padding: 24px;
            border: 1px solid var(--ds-border-light);
            box-shadow: var(--ds-shadow-sm);
            transition: all var(--ds-transition);
            display: flex;
            gap: 18px;
            align-items: flex-start;
        }
        .ds-post-card:hover {
            box-shadow: var(--ds-shadow);
            border-color: var(--ds-border);
        }
        .ds-post-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--ds-primary-light);
            color: var(--ds-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .ds-post-body {
            flex: 1;
            min-width: 0;
        }
        .ds-post-body h5 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--ds-text);
        }
        .ds-post-body .post-meta {
            font-size: 0.82rem;
            color: var(--ds-text-muted);
            margin-bottom: 6px;
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .ds-post-body .post-excerpt {
            font-size: 0.9rem;
            color: var(--ds-text-secondary);
            line-height: 1.6;
            margin: 0;
        }
        .ds-post-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 50px;
            background: var(--ds-primary-light);
            color: var(--ds-primary);
            margin-right: 6px;
            letter-spacing: 0.02em;
        }
        @media (max-width: 576px) {
            .ds-post-card {
                flex-direction: column;
                gap: 12px;
            }
        }

        /* ========== STATS ROW ========== */
        .ds-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .ds-stat-card {
            background: var(--ds-white);
            border-radius: var(--ds-radius-lg);
            padding: 28px 20px;
            text-align: center;
            border: 1px solid var(--ds-border-light);
            box-shadow: var(--ds-shadow-sm);
            transition: all var(--ds-transition);
        }
        .ds-stat-card:hover {
            box-shadow: var(--ds-shadow);
            transform: translateY(-2px);
        }
        .ds-stat-card .stat-big {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--ds-primary);
            line-height: 1;
            margin-bottom: 8px;
            letter-spacing: -0.02em;
        }
        .ds-stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--ds-text-secondary);
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .ds-stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .ds-stat-card .stat-big {
                font-size: 2rem;
            }
        }
        @media (max-width: 400px) {
            .ds-stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
        }

        /* ========== ACTIVITY CARD ========== */
        .ds-activity-card {
            background: var(--ds-white);
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
            border: 1px solid var(--ds-border-light);
            box-shadow: var(--ds-shadow-sm);
            transition: all var(--ds-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .ds-activity-card:hover {
            box-shadow: var(--ds-shadow-lg);
            transform: translateY(-3px);
        }
        .ds-activity-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }
        .ds-activity-body {
            padding: 20px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .ds-activity-body h5 {
            font-weight: 700;
            font-size: 1.05rem;
            margin-bottom: 6px;
            color: var(--ds-text);
        }
        .ds-activity-body .activity-date {
            font-size: 0.82rem;
            color: var(--ds-accent);
            font-weight: 600;
            margin-bottom: 6px;
        }
        .ds-activity-body p {
            font-size: 0.9rem;
            color: var(--ds-text-secondary);
            line-height: 1.55;
            flex-grow: 1;
            margin-bottom: 12px;
        }

        /* ========== BUTTONS ========== */
        .ds-btn {
            display: inline-block;
            padding: 12px 28px;
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: var(--ds-radius);
            border: none;
            cursor: pointer;
            transition: all var(--ds-transition);
            text-align: center;
            letter-spacing: 0.01em;
            white-space: nowrap;
            line-height: 1.4;
        }
        .ds-btn-primary {
            background: var(--ds-primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(26, 86, 219, 0.3);
        }
        .ds-btn-primary:hover {
            background: var(--ds-primary-dark);
            color: #fff;
            box-shadow: 0 6px 20px rgba(26, 86, 219, 0.4);
            transform: translateY(-1px);
        }
        .ds-btn-outline {
            background: transparent;
            color: var(--ds-primary);
            border: 2px solid var(--ds-primary);
        }
        .ds-btn-outline:hover {
            background: var(--ds-primary);
            color: #fff;
        }
        .ds-btn-accent {
            background: var(--ds-accent);
            color: #fff;
            box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
        }
        .ds-btn-accent:hover {
            background: #ea580c;
            color: #fff;
            box-shadow: 0 6px 20px rgba(249, 115, 22, 0.4);
            transform: translateY(-1px);
        }
        .ds-btn-lg {
            padding: 14px 36px;
            font-size: 1.05rem;
            border-radius: var(--ds-radius-lg);
        }
        .ds-btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
            border-radius: var(--ds-radius-sm);
        }

        /* ========== FAQ ========== */
        .ds-faq-item {
            background: var(--ds-white);
            border-radius: var(--ds-radius);
            border: 1px solid var(--ds-border-light);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--ds-transition);
        }
        .ds-faq-item:hover {
            border-color: var(--ds-border);
            box-shadow: var(--ds-shadow-sm);
        }
        .ds-faq-question {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--ds-text);
            user-select: none;
            transition: color var(--ds-transition);
        }
        .ds-faq-question:hover {
            color: var(--ds-primary);
        }
        .ds-faq-question .faq-icon {
            transition: transform var(--ds-transition);
            font-size: 0.85rem;
            color: var(--ds-text-muted);
            flex-shrink: 0;
            margin-left: 12px;
        }
        .ds-faq-item.open .ds-faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--ds-primary);
        }
        .ds-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 22px;
            font-size: 0.92rem;
            color: var(--ds-text-secondary);
            line-height: 1.7;
        }
        .ds-faq-item.open .ds-faq-answer {
            max-height: 400px;
            padding: 0 22px 18px 22px;
        }

        /* ========== CTA SECTION ========== */
        .ds-cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1a3c6e 100%);
            border-radius: var(--ds-radius-xl);
            padding: 50px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .ds-cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: 0;
        }
        .ds-cta-section>* {
            position: relative;
            z-index: 1;
        }
        .ds-cta-section h3 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .ds-cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 550px;
            margin: 0 auto 24px;
            line-height: 1.6;
        }
        @media (max-width: 576px) {
            .ds-cta-section {
                padding: 36px 20px;
            }
            .ds-cta-section h3 {
                font-size: 1.5rem;
            }
        }

        /* ========== FOOTER ========== */
        .ds-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 50px 0 30px;
            font-size: 0.9rem;
            line-height: 1.7;
        }
        .ds-footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
        }
        .ds-footer-brand .footer-logo {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            display: inline-block;
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }
        .ds-footer-brand .footer-logo:hover {
            color: #60a5fa;
        }
        .ds-footer-brand p {
            color: #94a3b8;
            margin: 0;
            font-size: 0.88rem;
            line-height: 1.65;
        }
        .ds-footer-social {
            display: flex;
            gap: 14px;
        }
        .ds-footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: #cbd5e1;
            font-size: 1rem;
            transition: all var(--ds-transition);
        }
        .ds-footer-social a:hover {
            background: var(--ds-primary);
            color: #fff;
        }
        .ds-footer-col h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .ds-footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .ds-footer-col ul li {
            margin-bottom: 8px;
        }
        .ds-footer-col ul li a {
            color: #94a3b8;
            font-size: 0.88rem;
            transition: color var(--ds-transition);
        }
        .ds-footer-col ul li a:hover {
            color: #fff;
        }
        .ds-footer-bottom {
            margin-top: 36px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            color: #64748b;
            font-size: 0.82rem;
        }
        @media (max-width: 768px) {
            .ds-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .ds-footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 480px) {
            .ds-footer-grid {
                grid-template-columns: 1fr;
                gap: 22px;
            }
        }

        /* ========== DIVIDER ========== */
        .ds-divider {
            border: none;
            border-top: 1px solid var(--ds-border);
            margin: 0;
        }

        /* ========== BADGE ROW ========== */
        .ds-badge-row {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .ds-badge-pill {
            display: inline-block;
            padding: 8px 16px;
            font-size: 0.85rem;
            font-weight: 500;
            border-radius: 50px;
            background: var(--ds-white);
            border: 1px solid var(--ds-border);
            color: var(--ds-text-secondary);
            transition: all var(--ds-transition);
            cursor: default;
        }
        .ds-badge-pill:hover {
            border-color: var(--ds-primary);
            color: var(--ds-primary);
            background: var(--ds-primary-light);
        }
        .ds-badge-pill.hot {
            background: #fef2f2;
            border-color: #fecaca;
            color: #dc2626;
            font-weight: 600;
        }

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

        /* ========== GRID HELPERS ========== */
        .ds-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .ds-grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        @media (max-width: 768px) {
            .ds-grid-3 {
                grid-template-columns: 1fr;
            }
            .ds-grid-2 {
                grid-template-columns: 1fr;
            }
        }
        @media (min-width: 769px) and (max-width: 1024px) {
            .ds-grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        /* ========== IMAGE ROUNDED ========== */
        .ds-img-rounded {
            border-radius: var(--ds-radius-lg);
            overflow: hidden;
        }
        .ds-img-rounded img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* ========== TWO COL LAYOUT ========== */
        .ds-two-col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        @media (max-width: 768px) {
            .ds-two-col {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }