/* roulang page: index */
/* ============ 设计变量 ============ */
        :root {
            --color-primary: #3D7EA6;
            --color-primary-dark: #2F628A;
            --color-primary-light: #EAF2F8;
            --color-accent: #E8863D;
            --color-bg: #F7FAFC;
            --color-surface: #FFFFFF;
            --color-text-heading: #1F2E3D;
            --color-text-body: #4B5B6A;
            --color-text-muted: #8494A5;
            --color-border: #DFE8F0;
            --color-footer-bg: #1C2A38;
            --color-footer-text: #9FAFBF;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 8px rgba(31, 46, 61, 0.06);
            --shadow-card-hover: 0 10px 28px rgba(31, 46, 61, 0.12);
            --space-section-mobile: 56px;
            --space-section-desktop: 96px;
            --container-max: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--color-bg);
            color: var(--color-text-body);
            line-height: 1.7;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color .2s, box-shadow .2s;
        }

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

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(61, 126, 166, 0.25);
            outline-offset: 2px;
        }

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

        .container {
            max-width: var(--container-max);
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--color-text-heading);
            font-weight: 600;
            line-height: 1.3;
            margin: 0 0 0.5em;
        }

        p {
            margin: 0 0 1rem;
        }

        /* ============ 顶部品牌行 ============ */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 1030;
            box-shadow: 0 1px 8px rgba(31, 46, 61, 0.04);
        }

        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            flex-wrap: wrap;
            gap: 12px;
        }

        .brand-logo a {
            font-weight: 700;
            font-size: 26px;
            color: var(--color-primary-dark);
            letter-spacing: 2px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .brand-logo a:hover {
            color: var(--color-primary);
        }

        .brand-logo .logo-badge {
            background: var(--color-primary);
            color: #fff;
            font-size: 12px;
            border-radius: var(--radius-pill);
            padding: 2px 10px;
            font-weight: 500;
        }

        .header-search {
            display: flex;
            gap: 8px;
            max-width: 340px;
            width: 100%;
        }

        .header-search input {
            flex: 1;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-btn);
            padding: 9px 16px;
            font-size: 14px;
            background: var(--color-bg);
            transition: border-color .2s, box-shadow .2s;
        }

        .header-search input:focus {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(61, 126, 166, 0.12);
            background: #fff;
            outline: none;
        }

        .header-search button {
            background: var(--color-primary);
            border: none;
            color: #fff;
            border-radius: var(--radius-btn);
            padding: 9px 20px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: background .2s, transform .15s;
        }

        .header-search button:hover {
            background: var(--color-primary-dark);
        }

        .header-login a {
            font-size: 14px;
            color: var(--color-primary);
            border: 1px solid var(--color-primary);
            border-radius: var(--radius-btn);
            padding: 8px 20px;
            display: inline-block;
            transition: background .2s, color .3s;
        }

        .header-login a:hover {
            background: var(--color-primary-light);
        }

        /* ============ 图标网格导航 ============ */
        .icon-nav {
            border-top: 1px solid var(--color-border);
            background: var(--color-surface);
        }

        .icon-nav .nav-items {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            padding: 10px 0;
            scrollbar-width: none;
            -webkit-overflow-scrolling: touch;
        }

        .icon-nav .nav-items::-webkit-scrollbar {
            display: none;
        }

        .icon-nav .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-card);
            flex-shrink: 0;
            min-width: 72px;
            transition: background .2s, transform .2s;
            text-decoration: none;
        }

        .icon-nav .nav-item:hover {
            background: var(--color-primary-light);
            transform: translateY(-2px);
        }

        .icon-nav .nav-item.active {
            background: var(--color-primary-light);
        }

        .icon-nav .nav-icon {
            width: 42px;
            height: 42px;
            border-radius: 14px;
            background: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-primary);
            transition: background .25s, color .25s;
        }

        .icon-nav .nav-item:hover .nav-icon,
        .icon-nav .nav-item.active .nav-icon {
            background: var(--color-primary);
            color: #fff;
        }

        .icon-nav .nav-label {
            font-size: 13px;
            color: var(--color-text-body);
            font-weight: 500;
            transition: color .2s;
        }

        .icon-nav .nav-item:hover .nav-label,
        .icon-nav .nav-item.active .nav-label {
            color: var(--color-primary);
        }

        /* ============ 通用区块样式 ============ */
        .section {
            padding: var(--space-section-mobile) 0;
        }

        @media (min-width: 992px) {
            .section {
                padding: var(--space-section-desktop) 0;
            }
        }

        .section-label {
            display: inline-block;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: var(--radius-pill);
            margin-bottom: 16px;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 15px;
            color: var(--color-text-muted);
            max-width: 640px;
            margin-bottom: 32px;
        }

        /* ============ Hero 首屏 ============ */
        .hero-section {
            background: linear-gradient(135deg, #EAF2F8 0%, #F7FAFC 60%, #FFFFFF 100%);
            padding: 60px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: "";
            position: absolute;
            top: -80px;
            right: -80px;
            width: 320px;
            height: 320px;
            border-radius: 50%;
            background: rgba(61, 126, 166, 0.06);
        }

        .hero-section::after {
            content: "";
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(232, 134, 61, 0.05);
        }

        .hero-wrap {
            display: flex;
            align-items: center;
            gap: 40px;
            flex-wrap: wrap;
        }

        .hero-text {
            flex: 1 1 480px;
            position: relative;
            z-index: 2;
        }

        .hero-text h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--color-text-heading);
        }

        .hero-text h1 .highlight {
            color: var(--color-primary);
        }

        .hero-text .hero-sub {
            font-size: 16px;
            color: var(--color-text-body);
            max-width: 500px;
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .hero-badges {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            margin-top: 20px;
        }

        .hero-badges span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--color-text-muted);
        }

        .hero-badges span::before {
            content: "";
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--color-accent);
            display: inline-block;
        }

        .hero-btn-group {
            display: flex;
            gap: 14px;
            align-items: center;
            flex-wrap: wrap;
        }

        .hero-text .btn-primary-custom {
            background: var(--color-accent);
            border: none;
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            padding: 12px 32px;
            border-radius: 10px;
            transition: background .2s, transform .2s, box-shadow .2s;
            box-shadow: 0 4px 14px rgba(232, 134, 61, 0.3);
        }

        .hero-text .btn-primary-custom:hover {
            background: #d8752a;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(232, 134, 61, 0.4);
        }

        .hero-text .btn-secondary-link {
            color: var(--color-primary);
            font-weight: 500;
            font-size: 15px;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .hero-text .btn-secondary-link:hover {
            color: var(--color-primary-dark);
        }

        .hero-text .btn-secondary-link .arrow {
            transition: transform .2s;
        }

        .hero-text .btn-secondary-link:hover .arrow {
            transform: translateX(4px);
        }

        .hero-image {
            flex: 0 1 460px;
            position: relative;
            z-index: 2;
        }

        .hero-image .img-wrap {
            border-radius: 14px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.9);
            box-shadow: var(--shadow-card-hover);
            aspect-ratio: 4/3;
        }

        .hero-image .img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .hero-tag {
            position: absolute;
            top: -12px;
            left: 16px;
            background: var(--color-accent);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: var(--radius-pill);
            box-shadow: 0 2px 8px rgba(232, 134, 61, 0.4);
        }

        @media (max-width: 991px) {
            .hero-wrap {
                flex-direction: column;
            }

            .hero-text,
            .hero-image {
                flex: 1 1 100% !important;
            }

            .hero-image {
                margin-top: 8px;
            }
        }

        /* ============ 痛点区 ============ */
        .pain-section {
            background: var(--color-surface);
        }

        .pain-cards .pain-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            height: 100%;
            box-shadow: var(--shadow-card);
            transition: transform .25s, box-shadow .25s;
        }

        .pain-cards .pain-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }

        .pain-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
            color: var(--color-primary);
        }

        .pain-card h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .pain-card p {
            font-size: 14px;
            color: var(--color-text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* ============ 解决方案区 ============ */
        .solution-section {
            background: var(--color-primary-light);
        }

        .solution-wrap {
            display: flex;
            align-items: center;
            gap: 48px;
            flex-wrap: wrap;
        }

        .solution-list {
            flex: 1 1 480px;
        }

        .solution-item {
            display: flex;
            gap: 16px;
            margin-bottom: 24px;
            align-items: flex-start;
        }

        .solution-item .icon-box {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 13px;
            font-weight: 700;
        }

        .solution-item h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .solution-item p {
            font-size: 14px;
            color: var(--color-text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }

        .solution-image {
            flex: 0 1 440px;
        }

        .solution-image .img-wrap {
            border-radius: 14px;
            overflow: hidden;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            aspect-ratio: 4/3;
        }

        .solution-image .img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        @media (max-width: 991px) {
            .solution-wrap {
                flex-direction: column-reverse;
            }

            .solution-list,
            .solution-image {
                flex: 1 1 100% !important;
            }
        }

        /* ============ 数据成果区 ============ */
        .stats-section {
            background: rgba(61, 126, 166, 0.06);
            border-top: 1px solid rgba(61, 126, 166, 0.08);
            border-bottom: 1px solid rgba(61, 126, 166, 0.08);
        }

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

        .stat-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: transform .2s;
        }

        .stat-card:hover {
            transform: scale(1.02);
        }

        .stat-num {
            font-size: 42px;
            font-weight: 700;
            color: var(--color-accent);
            line-height: 1.1;
        }

        .stat-line {
            width: 24px;
            height: 2px;
            background: var(--color-primary);
            margin: 12px auto;
            border-radius: 2px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--color-text-muted);
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ============ 爆款清单 ============ */
        .hot-section {
            background: var(--color-bg);
        }

        .video-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform .25s, box-shadow .25s;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .video-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }

        .video-card .card-img-wrap {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--color-primary-light);
        }

        .video-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s;
        }

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

        .video-card .duration-badge {
            position: absolute;
            bottom: 10px;
            right: 10px;
            background: rgba(15, 20, 25, 0.6);
            color: #fff;
            font-size: 12px;
            border-radius: 4px;
            padding: 2px 8px;
        }

        .video-card .card-body {
            padding: 16px 16px 14px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .video-card .card-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text-heading);
            line-height: 1.4;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            min-height: 42px;
        }

        .video-card .card-desc {
            font-size: 13px;
            color: var(--color-text-muted);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }

        .video-card .card-footer-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid var(--color-border);
            padding-top: 12px;
            margin-top: auto;
        }

        .video-card .tag-chip {
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 12px;
            font-weight: 500;
            border-radius: var(--radius-pill);
            padding: 3px 12px;
        }

        .video-card .view-count {
            font-size: 12px;
            color: var(--color-text-muted);
        }

        /* ============ 评价墙 ============ */
        .testimonial-section {
            background: var(--color-surface);
        }

        .testimonial-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            height: 100%;
            position: relative;
            transition: transform .25s, box-shadow .25s;
        }

        .testimonial-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }

        .testimonial-card::before {
            content: "\201C";
            position: absolute;
            top: 8px;
            right: 20px;
            font-size: 60px;
            color: rgba(61, 126, 166, 0.12);
            font-family: Georgia, serif;
            line-height: 1;
        }

        .testimonial-stars {
            color: var(--color-accent);
            font-size: 16px;
            letter-spacing: 2px;
            margin-bottom: 14px;
        }

        .testimonial-card blockquote {
            font-size: 14px;
            color: var(--color-text-body);
            line-height: 1.7;
            margin: 0 0 16px;
            border: none;
            padding: 0;
        }

        .testimonial-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .testimonial-user .avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--color-primary-light);
            color: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
        }

        .testimonial-user .nickname {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-heading);
        }

        .testimonial-user .role {
            font-size: 12px;
            color: var(--color-text-muted);
        }

        /* ============ 资讯区 ============ */
        .news-section {
            background: var(--color-primary-light);
        }

        .news-list {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            padding: 24px;
            margin-bottom: 24px;
        }

        .news-list .news-item {
            display: flex;
            gap: 12px;
            padding: 14px 0;
            border-bottom: 1px solid var(--color-border);
            align-items: baseline;
        }

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

        .news-list .news-item .news-title {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text-heading);
            transition: color .2s;
            flex: 1;
        }

        .news-list .news-item .news-title:hover {
            color: var(--color-primary);
        }

        .news-list .news-item .news-date {
            font-size: 12px;
            color: var(--color-text-muted);
            flex-shrink: 0;
        }

        .news-sidebar .side-card {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            padding: 24px;
            margin-bottom: 24px;
        }

        .news-sidebar .side-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--color-primary-light);
        }

        .news-sidebar .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .news-sidebar .tag-cloud a {
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-size: 13px;
            border-radius: var(--radius-pill);
            padding: 4px 14px;
            transition: background .2s, color .2s;
        }

        .news-sidebar .tag-cloud a:hover {
            background: var(--color-primary);
            color: #fff;
        }

        /* ============ FAQ ============ */
        .faq-section {
            background: var(--color-bg);
        }

        .faq-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            margin-bottom: 10px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: border-color .2s, box-shadow .2s;
        }

        .faq-card:hover {
            border-color: rgba(61, 126, 166, 0.3);
        }

        .faq-card.active {
            border-color: var(--color-primary);
            background: var(--color-primary-light);
        }

        .faq-card .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text-heading);
            transition: color .2s;
            border: none;
            background: transparent;
            width: 100%;
            text-align: left;
        }

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

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

        .faq-card .faq-icon {
            font-size: 20px;
            transition: transform .25s;
            color: var(--color-primary);
            flex-shrink: 0;
            margin-left: 12px;
        }

        .faq-card.active .faq-icon {
            transform: rotate(45deg);
        }

        .faq-card .faq-answer {
            padding: 0 20px 16px;
            font-size: 14px;
            color: var(--color-text-body);
            line-height: 1.7;
            display: none;
        }

        .faq-card.active .faq-answer {
            display: block;
        }

        /* ============ CTA 区块 ============ */
        .cta-section {
            background: linear-gradient(135deg, #EAF2F8 0%, #F7FAFC 50%, #FFFFFF 100%);
            text-align: center;
            padding: 72px 20px;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            top: -100px;
            left: 50%;
            transform: translateX(-50%);
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(61, 126, 166, 0.04);
        }

        .cta-section h2 {
            font-size: 30px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 16px;
            color: var(--color-text-muted);
            max-width: 560px;
            margin: 0 auto 28px;
        }

        .cta-section .btn-cta {
            background: var(--color-accent);
            border: none;
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            padding: 14px 40px;
            border-radius: 10px;
            box-shadow: 0 4px 14px rgba(232, 134, 61, 0.3);
            transition: background .2s, transform .2s, box-shadow .2s;
        }

        .cta-section .btn-cta:hover {
            background: #d8752a;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(232, 134, 61, 0.4);
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 64px 0 0;
            font-size: 14px;
        }

        .site-footer .footer-brand {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: inline-block;
        }

        .site-footer .footer-desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-footer-text);
            max-width: 280px;
            margin-bottom: 20px;
        }

        .site-footer h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
        }

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

        .site-footer ul li {
            margin-bottom: 10px;
        }

        .site-footer ul li a {
            color: var(--color-footer-text);
            transition: color .2s, padding-left .2s;
            display: inline-block;
        }

        .site-footer ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 48px;
            padding: 18px 0;
            text-align: center;
            font-size: 12px;
            color: rgba(159, 175, 191, 0.7);
        }

        .footer-bottom span {
            color: var(--color-footer-text);
        }

        /* ============ 其他通用 ============ */
        .btn-primary-custom {
            background: var(--color-primary);
            border: none;
            color: #fff;
            font-size: 14px;
            font-weight: 500;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: background .2s, transform .15s, box-shadow .2s;
        }

        .btn-primary-custom:hover {
            background: var(--color-primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(61, 126, 166, 0.25);
        }

        .btn-primary-custom:active {
            transform: translateY(1px);
        }

        .breadcrumb-custom {
            font-size: 13px;
            color: var(--color-text-muted);
            margin-bottom: 8px;
        }

        .breadcrumb-custom a {
            color: var(--color-primary);
        }

        .text-muted {
            color: var(--color-text-muted);
        }

        /* ============ 响应式断点 ============ */
        @media (max-width: 1024px) {
            .container {
                padding-left: 24px;
                padding-right: 24px;
            }
        }

        @media (max-width: 768px) {
            .brand-row {
                flex-direction: column;
                align-items: flex-start;
            }

            .header-search {
                max-width: 100%;
                margin-top: 8px;
            }

            .header-login {
                position: absolute;
                top: 20px;
                right: 24px;
            }

            .hero-text h1 {
                font-size: 26px;
            }

            .section-title {
                font-size: 24px;
            }

            .hero-text .btn-primary-custom,
            .cta-section .btn-cta {
                padding: 12px 28px;
                font-size: 15px;
            }

            .icon-nav .nav-items {
                padding: 8px 0;
            }

            .news-sidebar {
                margin-top: 12px;
            }
        }

        @media (max-width: 520px) {
            .hero-text h1 {
                font-size: 22px;
            }

            .hero-sub {
                font-size: 14px !important;
            }

            .hero-badges {
                gap: 10px;
                flex-direction: column;
                align-items: flex-start;
            }

            .stat-num {
                font-size: 32px;
            }

            .section-title {
                font-size: 22px;
            }

            .video-card .card-title {
                font-size: 14px;
            }

            .news-list .news-item {
                flex-direction: column;
                gap: 4px;
            }

            .news-list .news-date {
                font-size: 11px;
            }

            .footer-bottom {
                padding: 14px 12px;
            }
        }

/* roulang page: category1 */
/* ============ 设计变量 ============ */
:root {
  --color-primary: #3D7EA6;
  --color-primary-dark: #2F628A;
  --color-primary-light: #EAF2F8;
  --color-accent: #E8863D;
  --color-bg: #F7FAFC;
  --color-surface: #FFFFFF;
  --color-text-heading: #1F2E3D;
  --color-text-body: #4B5B6A;
  --color-text-muted: #8494A5;
  --color-border: #DFE8F0;
  --color-footer-bg: #1C2A38;
  --color-footer-text: #9FAFBF;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 8px rgba(31, 46, 61, 0.06);
  --shadow-card-hover: 0 10px 28px rgba(31, 46, 61, 0.12);
  --space-section-mobile: 56px;
  --space-section-desktop: 96px;
  --container-max: 1200px;
}

/* ============ 基础 ============ */
html {
  scroll-behavior: smooth;
}
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-body);
  line-height: 1.7;
  margin: 0;
  -webkit-font-smoothing: antialiased;
}
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color .2s, box-shadow .2s;
}
a:hover {
  color: var(--color-primary-dark);
}
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(61, 126, 166, 0.25);
  outline-offset: 2px;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
.container {
  max-width: var(--container-max);
}

/* ============ 顶部品牌行 ============ */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1030;
  box-shadow: 0 1px 8px rgba(31, 46, 61, 0.04);
}
.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  flex-wrap: wrap;
  gap: 12px;
}
.brand-logo a {
  font-weight: 700;
  font-size: 26px;
  color: var(--color-primary-dark);
  letter-spacing: 2px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.brand-logo a:hover {
  color: var(--color-primary);
}
.brand-logo .logo-badge {
  background: var(--color-primary);
  color: #fff;
  font-size: 12px;
  border-radius: var(--radius-pill);
  padding: 2px 10px;
  font-weight: 500;
}
.header-search {
  display: flex;
  gap: 8px;
  max-width: 340px;
  width: 100%;
}
.header-search input {
  flex: 1;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-btn);
  padding: 9px 16px;
  font-size: 14px;
  background: var(--color-bg);
  transition: border-color .2s, box-shadow .2s;
}
.header-search input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(61, 126, 166, 0.12);
  background: #fff;
  outline: none;
}
.header-search button {
  background: var(--color-primary);
  border: none;
  color: #fff;
  border-radius: var(--radius-btn);
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s, transform .15s;
  white-space: nowrap;
}
.header-search button:hover {
  background: var(--color-primary-dark);
}
.header-login a {
  font-size: 14px;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-btn);
  padding: 8px 20px;
  display: inline-block;
  transition: background .2s, color .3s;
  white-space: nowrap;
}
.header-login a:hover {
  background: var(--color-primary-light);
}

/* ============ 图标网格导航 ============ */
.icon-nav {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}
.icon-nav .nav-items {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px 0;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.icon-nav .nav-items::-webkit-scrollbar {
  display: none;
}
.icon-nav .nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-card);
  flex-shrink: 0;
  min-width: 72px;
  transition: background .2s, transform .2s;
  text-decoration: none;
}
.icon-nav .nav-item:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
}
.icon-nav .nav-item.active {
  background: var(--color-primary-light);
}
.icon-nav .nav-icon {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  transition: background .25s, color .25s;
}
.icon-nav .nav-item:hover .nav-icon,
.icon-nav .nav-item.active .nav-icon {
  background: var(--color-primary);
  color: #fff;
}
.icon-nav .nav-label {
  font-size: 13px;
  color: var(--color-text-body);
  font-weight: 500;
  transition: color .2s;
  white-space: nowrap;
}
.icon-nav .nav-item:hover .nav-label,
.icon-nav .nav-item.active .nav-label {
  color: var(--color-primary);
}

/* ============ 分类 Hero ============ */
.category-hero {
  background: var(--color-primary-light);
  border-bottom: 1px solid var(--color-border);
  padding: 56px 0;
  position: relative;
  overflow: hidden;
}
.category-hero::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(61, 126, 166, 0.06);
  pointer-events: none;
}
.category-hero::after {
  content: "";
  position: absolute;
  left: -60px;
  bottom: -100px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(61, 126, 166, 0.04);
  pointer-events: none;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 16px;
}
.back-link:hover {
  color: var(--color-primary-dark);
}
.breadcrumb-custom {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  font-size: 13px;
  color: var(--color-text-muted);
}
.breadcrumb-custom li {
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb-custom li + li::before {
  content: "/";
  color: var(--color-text-muted);
}
.breadcrumb-custom a {
  color: var(--color-text-muted);
}
.breadcrumb-custom a:hover {
  color: var(--color-primary);
}
.breadcrumb-custom .active {
  color: var(--color-text-heading);
  font-weight: 500;
}
.hero-title {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-heading);
  margin: 0 0 12px;
  letter-spacing: 1px;
}
.hero-title span {
  color: var(--color-primary);
}
.hero-desc {
  font-size: 16px;
  color: var(--color-text-body);
  max-width: 560px;
  margin-bottom: 24px;
  line-height: 1.8;
}
.hero-mini-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.hero-mini-badges span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-text-heading);
  font-weight: 500;
}
.hero-mini-badges span::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}
.hero-img-wrap {
  position: relative;
}
.hero-img-wrap img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-card-hover);
}

/* ============ 视频内容区 ============ */
.video-gallery {
  padding: var(--space-section-mobile) 0;
}
@media (min-width: 768px) {
  .video-gallery {
    padding: var(--space-section-desktop) 0;
  }
}
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 36px;
}
.section-head h2 {
  font-size: 28px;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 8px;
}
.section-head p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin: 0;
}
.filter-bar {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 4px 16px;
  margin-bottom: 24px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.filter-bar::-webkit-scrollbar {
  display: none;
}
.filter-btn {
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-body);
  border-radius: var(--radius-pill);
  padding: 8px 22px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, box-shadow .2s;
  white-space: nowrap;
}
.filter-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(61, 126, 166, 0.18);
}

/* ============ 视频卡片 ============ */
.video-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform .3s, box-shadow .3s;
  display: flex;
  flex-direction: column;
  height: 100%;
}
.video-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--color-primary-light);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s;
}
.video-card:hover .video-thumb img {
  transform: scale(1.04);
}
.video-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--color-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 4px;
  padding: 3px 10px;
  line-height: 1.4;
}
.video-duration {
  position: absolute;
  right: 12px;
  bottom: 12px;
  background: rgba(15, 20, 25, 0.6);
  color: #fff;
  font-size: 12px;
  border-radius: 4px;
  padding: 2px 8px;
  line-height: 1.4;
  backdrop-filter: blur(4px);
}
.video-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.video-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 44px;
}
.video-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}
.video-tag {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  padding: 2px 12px;
}
.video-views {
  font-size: 12px;
  color: var(--color-text-muted);
}
.video-views strong {
  color: var(--color-accent);
  font-weight: 600;
}

/* ============ 分页 ============ */
.pagination-custom {
  display: flex;
  justify-content: center;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 40px 0 0;
}
.pagination-custom li a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-btn);
  background: var(--color-surface);
  color: var(--color-text-body);
  font-size: 14px;
  font-weight: 500;
  padding: 0 14px;
  transition: background .2s, color .2s, border-color .2s, box-shadow .2s;
}
.pagination-custom li a:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.pagination-custom li.active a {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(61, 126, 166, 0.18);
}

/* ============ FAQ ============ */
.faq-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-section-mobile) 0;
}
@media (min-width: 768px) {
  .faq-section {
    padding: var(--space-section-desktop) 0;
  }
}
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-card) !important;
  background: var(--color-surface);
  margin-bottom: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: border-color .3s, box-shadow .3s;
}
.faq-item:has(.accordion-button:not(.collapsed)) {
  border-color: rgba(61, 126, 166, 0.4) !important;
  background: var(--color-primary-light);
  box-shadow: 0 4px 16px rgba(61, 126, 166, 0.08);
}
.accordion-button {
  background: var(--color-surface);
  color: var(--color-text-heading);
  font-size: 16px;
  font-weight: 600;
  padding: 18px 22px;
  border: none;
  box-shadow: none;
  transition: background .3s, color .3s;
}
.accordion-button:not(.collapsed) {
  background: var(--color-primary-light);
  color: var(--color-primary);
  box-shadow: none;
}
.accordion-button:focus {
  box-shadow: none;
}
.accordion-button::after {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' viewBox='0 0 24 24' stroke='%233D7EA6' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='12' y1='5' x2='12' y2='19'/%3E%3Cline x1='5' y1='12' x2='19' y2='12'/%3E%3C/svg%3E");
  background-size: 16px;
  transition: transform .3s;
}
.accordion-button:not(.collapsed)::after {
  transform: rotate(45deg);
}
.accordion-body {
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--color-text-body);
  line-height: 1.7;
  background: var(--color-primary-light);
  border-top: 1px solid rgba(61, 126, 166, 0.1);
  padding-top: 12px;
}
.accordion-body p {
  margin: 0;
}

/* ============ CTA ============ */
.cta-section {
  background: linear-gradient(135deg, #3D7EA6 0%, #5A9CC0 100%);
  padding: var(--space-section-mobile) 0;
  position: relative;
  overflow: hidden;
}
@media (min-width: 768px) {
  .cta-section {
    padding: var(--space-section-desktop) 0;
  }
}
.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  pointer-events: none;
}
.cta-section .container {
  position: relative;
  z-index: 1;
  text-align: center;
}
.cta-title {
  font-size: 30px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.cta-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 28px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}
.cta-btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border-radius: 10px;
  padding: 14px 40px;
  transition: background .3s, transform .2s, box-shadow .3s;
  box-shadow: 0 4px 16px rgba(232, 134, 61, 0.35);
}
.cta-btn:hover {
  background: #d9792f;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(232, 134, 61, 0.45);
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-footer-bg);
  padding: 64px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.footer-brand {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 3px;
  margin-bottom: 16px;
}
.footer-desc {
  font-size: 14px;
  color: var(--color-footer-text);
  line-height: 1.8;
  max-width: 360px;
  margin-bottom: 0;
}
.site-footer h4 {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.site-footer ul li {
  margin-bottom: 10px;
}
.site-footer ul li a {
  color: var(--color-footer-text);
  font-size: 14px;
  transition: color .2s, padding-left .2s;
}
.site-footer ul li a:hover {
  color: #fff;
  padding-left: 4px;
}
.site-footer ul li span {
  color: var(--color-footer-text);
  font-size: 14px;
}
.footer-bottom {
  margin-top: 48px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  text-align: center;
  font-size: 12px;
  color: rgba(159, 175, 191, 0.7);
}

/* ============ 响应式 ============ */
@media (max-width: 991px) {
  .hero-title {
    font-size: 32px;
  }
  .hero-img-wrap {
    margin-top: 20px;
  }
}
@media (max-width: 767px) {
  .brand-row {
    padding: 12px 0;
  }
  .brand-logo a {
    font-size: 22px;
  }
  .header-search {
    order: 3;
    max-width: 100%;
  }
  .header-login {
    margin-left: auto;
  }
  .category-hero {
    padding: 40px 0;
  }
  .hero-title {
    font-size: 28px;
  }
  .hero-mini-badges {
    gap: 14px;
  }
  .section-head h2 {
    font-size: 24px;
  }
  .cta-title {
    font-size: 24px;
  }
  .cta-btn {
    padding: 12px 32px;
    font-size: 15px;
  }
}
@media (max-width: 575px) {
  .icon-nav .nav-item {
    min-width: 64px;
    padding: 8px 14px;
  }
  .icon-nav .nav-icon {
    width: 38px;
    height: 38px;
  }
  .hero-title {
    font-size: 26px;
  }
  .hero-desc {
    font-size: 15px;
  }
  .filter-btn {
    padding: 7px 18px;
    font-size: 13px;
  }
  .video-meta {
    flex-wrap: wrap;
    gap: 8px;
  }
  .footer-desc {
    max-width: 100%;
  }
}

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}