/* roulang page: index */
:root {
            --bg-base: #F8FAFC;
            --bg-surface: #FFFFFF;
            --bg-dark: #0F172A;
            --bg-dark-card: #1E293B;
            --primary: #0284C7;
            --primary-hover: #0369A1;
            --primary-light: #E0F2FE;
            --accent: #10B981;
            --accent-glow: rgba(16, 185, 129, 0.2);
            --text-main: #1E293B;
            --text-muted: #64748B;
            --text-white: #F8FAFC;
            --border-light: #E2E8F0;
            --border-dark: #334155;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-float: 0 12px 32px -4px rgba(15, 23, 42, 0.12);
            --max-w: 1280px;
            --transition: all 0.25s ease-in-out;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-main);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            width: 100%;
        }

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

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

        button, input, select, textarea {
            font-family: inherit;
            font-size: 1rem;
        }

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

        /* 顶部通栏信息条 */
        .top-bar {
            background-color: var(--bg-dark);
            color: #94A3B8;
            font-size: 13px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            padding: 8px 0;
        }
        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-bar-tags {
            display: flex;
            gap: 20px;
            align-items: center;
        }
        .badge-live {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--accent);
            font-weight: 500;
        }
        .live-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--accent);
            box-shadow: 0 0 8px var(--accent);
        }

        /* 导航栏 */
        .site-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 800;
            font-size: 19px;
            color: var(--bg-dark);
            letter-spacing: -0.5px;
        }
        .brand-logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 900;
            font-size: 18px;
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 32px;
            align-items: center;
        }
        .nav-menu a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            position: relative;
            padding: 6px 0;
        }
        .nav-menu a:hover {
            color: var(--primary);
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: var(--transition);
        }
        .nav-menu a:hover::after {
            width: 100%;
        }
        .header-actions {
            display: flex;
            gap: 16px;
            align-items: center;
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-main);
            cursor: pointer;
        }

        /* 按钮体系 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
        }
        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-1px);
        }
        .btn-secondary {
            background-color: #fff;
            color: var(--text-main);
            border-color: var(--border-light);
        }
        .btn-secondary:hover {
            background-color: #F1F5F9;
            border-color: #CBD5E1;
        }
        .btn-accent {
            background-color: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px var(--accent-glow);
        }
        .btn-accent:hover {
            background-color: #059669;
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 14px;
        }

        /* 板块通用 */
        .section {
            padding: 90px 0;
            position: relative;
        }
        .section-alt {
            background-color: #FFFFFF;
        }
        .section-dark {
            background-color: var(--bg-dark);
            color: var(--text-white);
        }
        .section-header {
            text-align: center;
            max-width: 820px;
            margin: 0 auto 56px auto;
        }
        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--primary);
            background: var(--primary-light);
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 14px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .section-tag-dark {
            background: rgba(2, 132, 199, 0.2);
            color: #38BDF8;
        }
        .section-title {
            font-size: 34px;
            font-weight: 800;
            letter-spacing: -0.5px;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.8;
        }
        .section-dark .section-desc {
            color: #94A3B8;
        }

        /* 1. Hero 蓝图短视频竖屏感视觉版式 */
        .hero-section {
            background: radial-gradient(circle at 80% 20%, #E0F2FE 0%, #F8FAFC 60%);
            padding: 70px 0 90px;
            border-bottom: 1px solid var(--border-light);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 50px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 44px;
            line-height: 1.25;
            font-weight: 900;
            color: var(--bg-dark);
            margin-bottom: 22px;
            letter-spacing: -1px;
        }
        .hero-lead {
            font-size: 16px;
            color: #475569;
            margin-bottom: 32px;
            line-height: 1.8;
            max-width: 640px;
        }
        .hero-btn-group {
            display: flex;
            gap: 16px;
            align-items: center;
            margin-bottom: 36px;
        }
        .hero-signals {
            display: flex;
            gap: 24px;
            border-top: 1px solid var(--border-light);
            padding-top: 24px;
        }
        .signal-item {
            font-size: 13px;
            color: var(--text-muted);
        }
        .signal-item strong {
            display: block;
            font-size: 18px;
            color: var(--bg-dark);
            font-weight: 700;
        }

        /* 竖屏视频感画幅展示舞台 */
        .hero-showcase {
            display: flex;
            justify-content: center;
            position: relative;
        }
        .portrait-stage {
            width: 330px;
            height: 580px;
            border-radius: 36px;
            background: #000;
            padding: 12px;
            box-shadow: 0 25px 60px -12px rgba(15, 23, 42, 0.35);
            position: relative;
            border: 4px solid #334155;
        }
        .portrait-inner {
            width: 100%;
            height: 100%;
            border-radius: 26px;
            overflow: hidden;
            position: relative;
            background: #1E293B;
        }
        .portrait-inner img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .portrait-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15,23,42,0.1) 0%, rgba(15,23,42,0.85) 85%);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 24px;
            color: #fff;
        }
        .portrait-badge {
            align-self: flex-start;
            background: rgba(16, 185, 129, 0.9);
            padding: 4px 10px;
            border-radius: 12px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .portrait-title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .portrait-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 8px;
            font-size: 12px;
            background: rgba(255,255,255,0.1);
            padding: 8px 12px;
            border-radius: 8px;
            backdrop-filter: blur(8px);
        }

        /* 2. 分类入口墙 */
        .grid-categories {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .cat-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
        }
        .cat-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
            box-shadow: var(--shadow-float);
        }
        .cat-card-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 20px;
            margin-bottom: 18px;
        }
        .cat-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .cat-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 3. 核心卖点三连 */
        .three-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .feature-box {
            background: var(--bg-surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            box-shadow: var(--shadow-subtle);
        }
        .feature-index {
            font-size: 28px;
            font-weight: 900;
            color: var(--primary);
            opacity: 0.3;
            margin-bottom: 12px;
        }
        .feature-box h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .feature-box p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 4. 精选推荐模块 */
        .curated-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .curated-card {
            background: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .curated-card:hover {
            box-shadow: var(--shadow-float);
        }
        .curated-thumb {
            height: 190px;
            position: relative;
            overflow: hidden;
        }
        .curated-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .curated-card:hover .curated-thumb img {
            transform: scale(1.04);
        }
        .curated-body {
            padding: 24px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .curated-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .curated-body p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 18px;
            flex-grow: 1;
        }
        .curated-meta {
            border-top: 1px solid var(--border-light);
            padding-top: 14px;
            font-size: 13px;
            color: var(--primary);
            font-weight: 600;
            display: flex;
            justify-content: space-between;
        }

        /* 5. 架构与理念全宽深色区 */
        .tech-diagram-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .tech-spec-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .tech-spec-item {
            background: var(--bg-dark-card);
            border: 1px solid var(--border-dark);
            padding: 20px 24px;
            border-radius: var(--radius-sm);
        }
        .tech-spec-item h4 {
            font-size: 16px;
            color: #38BDF8;
            margin-bottom: 6px;
        }
        .tech-spec-item p {
            font-size: 14px;
            color: #94A3B8;
            line-height: 1.6;
        }
        .tech-banner-visual {
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-dark);
        }

        /* 6. 指标统计条 */
        .metrics-strip {
            background: #fff;
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
            padding: 50px 0;
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .metric-cell {
            padding: 0 16px;
            border-right: 1px solid var(--border-light);
        }
        .metric-cell:last-child {
            border-right: none;
        }
        .metric-num {
            font-size: 38px;
            font-weight: 900;
            color: var(--primary);
            font-family: monospace, sans-serif;
            margin-bottom: 6px;
        }
        .metric-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 4px;
        }
        .metric-sub {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 7. 研报资讯区 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .news-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 26px;
        }
        .news-date {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .news-card h3 {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 12px;
        }
        .news-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 8. 场景演示与排行榜 */
        .ranking-wrapper {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
        }
        .ranking-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }
        .ranking-table th {
            background: #F1F5F9;
            padding: 16px 20px;
            font-size: 14px;
            font-weight: 700;
            color: var(--text-main);
            border-bottom: 1px solid var(--border-light);
        }
        .ranking-table td {
            padding: 18px 20px;
            font-size: 14px;
            border-bottom: 1px solid var(--border-light);
            color: var(--text-main);
        }
        .ranking-table tr:last-child td {
            border-bottom: none;
        }
        .badge-score {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 700;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 13px;
        }

        /* 9. 客户故事与落地证据 */
        .cases-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .case-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 32px;
        }
        .case-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 16px;
        }
        .case-title {
            font-size: 19px;
            font-weight: 700;
        }
        .case-tag {
            font-size: 12px;
            background: #ECFDF5;
            color: #059669;
            padding: 3px 10px;
            border-radius: 12px;
            font-weight: 600;
        }
        .case-card p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.7;
        }
        .case-result {
            background: #F8FAFC;
            border-left: 3px solid var(--accent);
            padding: 12px 16px;
            font-size: 13px;
            color: var(--text-main);
        }

        /* 10. 对比差异表 */
        .comparison-table-wrap {
            background: #fff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow-x: auto;
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }
        .compare-table th, .compare-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-light);
            text-align: left;
        }
        .compare-table th {
            background: #F8FAFC;
            font-weight: 700;
            color: var(--text-main);
        }
        .compare-highlight {
            background: #F0F9FF;
            font-weight: 600;
            color: var(--primary);
        }

        /* 11. 异议拆解 Accordion */
        .accordion {
            max-width: 860px;
            margin: 0 auto;
        }
        .accordion-item {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
        }
        .accordion-header {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            background: #fff;
            transition: var(--transition);
        }
        .accordion-header:hover {
            background: #F8FAFC;
        }
        .accordion-content {
            padding: 0 24px 20px 24px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.75;
            display: none;
            border-top: 1px solid #F1F5F9;
        }
        .accordion-item.active .accordion-content {
            display: block;
        }
        .accordion-icon {
            font-size: 18px;
            color: var(--text-muted);
            transition: transform 0.2s ease;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(45deg);
        }

        /* 12. 平台保障条 */
        .trust-strip {
            background: #0F172A;
            color: #fff;
            padding: 40px 0;
            border-top: 1px solid var(--border-dark);
        }
        .trust-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
        }
        .trust-item {
            display: flex;
            gap: 16px;
            align-items: center;
        }
        .trust-icon-box {
            width: 44px;
            height: 44px;
            border-radius: 8px;
            background: rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: #38BDF8;
            flex-shrink: 0;
        }
        .trust-info h4 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .trust-info p {
            font-size: 12px;
            color: #94A3B8;
        }

        /* 13. 试用与预约强转化收口区 */
        .conversion-box {
            background: linear-gradient(135deg, #0284C7 0%, #0369A1 100%);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            color: #fff;
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 50px;
            align-items: center;
            box-shadow: var(--shadow-float);
        }
        .conv-text h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .conv-text p {
            font-size: 15px;
            color: #E0F2FE;
            line-height: 1.7;
            margin-bottom: 24px;
        }
        .conv-form {
            background: #fff;
            padding: 32px;
            border-radius: var(--radius-md);
            color: var(--text-main);
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 6px;
            color: #334155;
        }
        .form-input {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            font-size: 14px;
            outline: none;
            transition: var(--transition);
        }
        .form-input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
        }
        .form-status {
            font-size: 12px;
            color: #059669;
            margin-top: 8px;
            display: none;
        }

        /* 页脚 */
        .site-footer {
            background: #090D16;
            color: #94A3B8;
            padding: 70px 0 30px 0;
            font-size: 14px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 50px;
        }
        .footer-brand h4 {
            color: #fff;
            font-size: 18px;
            margin-bottom: 14px;
        }
        .footer-brand p {
            line-height: 1.7;
            font-size: 13px;
        }
        .footer-links h5 {
            color: #fff;
            font-size: 15px;
            margin-bottom: 16px;
            font-weight: 700;
        }
        .footer-links ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: #94A3B8;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-contact h5 {
            color: #fff;
            font-size: 15px;
            margin-bottom: 16px;
            font-weight: 700;
        }
        .footer-contact p {
            margin-bottom: 8px;
            font-size: 13px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
        }
        .footer-bottom a {
            color: #64748B;
        }
        .footer-bottom a:hover {
            color: #94A3B8;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .grid-categories { grid-template-columns: repeat(2, 1fr); }
            .curated-grid { grid-template-columns: repeat(2, 1fr); }
            .three-grid { grid-template-columns: 1fr; }
            .hero-grid { grid-template-columns: 1fr; }
            .tech-diagram-wrap { grid-template-columns: 1fr; }
            .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
            .metric-cell { border-right: none; }
            .cases-grid { grid-template-columns: 1fr; }
            .trust-grid { grid-template-columns: repeat(2, 1fr); }
            .conversion-box { grid-template-columns: 1fr; padding: 40px 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .top-bar { display: none; }
            .nav-menu { display: none; }
            .mobile-toggle { display: block; }
            .hero-content h1 { font-size: 30px; }
            .section { padding: 56px 0; }
            .section-title { font-size: 26px; }
            .curated-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
            .portrait-stage { width: 280px; height: 500px; }
        }