/* roulang page: index */
:root {
      --primary: #0284c7;
      --primary-dark: #0369a1;
      --navy: #0f172a;
      --navy-deep: #0b0f19;
      --accent: #10b981;
      --accent-purple: #6366f1;
      --accent-red: #ef4444;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --radius: 10px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.68;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 70px;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Topbar & Header */
    .top-bar {
      background: var(--navy);
      color: #94a3b8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-meta {
      display: flex;
      gap: 20px;
    }
    .live-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #38bdf8;
    }
    .live-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
      animation: pulse 1.5s infinite;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 18px;
      color: var(--navy);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent-purple));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 18px;
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .nav-link {
      font-weight: 500;
      color: #334155;
      padding: 8px 4px;
      transition: var(--transition);
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 14px;
      padding: 10px 22px;
      border-radius: 6px;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.4;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
    }
    .btn-accent:hover {
      background: #059669;
    }
    .btn-outline {
      border-color: #cbd5e1;
      color: var(--text-main);
      background: #fff;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline-white {
      border-color: rgba(255, 255, 255, 0.4);
      color: #fff;
      background: transparent;
    }
    .btn-outline-white:hover {
      border-color: #fff;
      background: rgba(255, 255, 255, 0.1);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--navy);
      cursor: pointer;
    }

    /* Sections Shared */
    section {
      padding: 84px 0;
      position: relative;
    }
    .section-dark {
      background: var(--navy-deep);
      color: #f1f5f9;
    }
    .section-light {
      background: var(--bg-light);
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 50px;
    }
    .section-badge {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: 20px;
      background: #e0f2fe;
      color: var(--primary);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-dark .section-badge {
      background: rgba(2, 132, 199, 0.2);
      color: #38bdf8;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.35;
      color: var(--navy);
      margin-bottom: 14px;
    }
    .section-dark .section-title {
      color: #fff;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94a3b8;
    }

    /* Section 1: Hero (Blueprint: 促销/强转化 + 爆炸贴) */
    .hero-section {
      padding: 70px 0 80px;
      background: linear-gradient(170deg, #0f172a 0%, #1e293b 100%);
      color: #fff;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-sticker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(90deg, #f43f5e, #e11d48);
      color: #fff;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 700;
      border-radius: 4px;
      margin-bottom: 20px;
      box-shadow: 0 4px 12px rgba(244, 63, 94, 0.35);
      animation: bounce 2s infinite ease-in-out;
    }
    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(90deg, #38bdf8, #818cf8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-intro {
      font-size: 16px;
      line-height: 1.75;
      color: #cbd5e1;
      margin-bottom: 28px;
      max-width: 620px;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 30px;
    }
    .hero-meta-points {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      padding-top: 24px;
    }
    .hero-meta-item strong {
      display: block;
      font-size: 22px;
      color: #38bdf8;
      font-weight: 800;
    }
    .hero-meta-item span {
      font-size: 13px;
      color: #94a3b8;
    }
    .hero-visual-card {
      position: relative;
      background: rgba(15, 23, 42, 0.7);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: var(--shadow-lg);
    }
    .hero-visual-card img {
      border-radius: 6px;
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    /* Section 2: 架构与拓扑 (硬核参数) */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-list {
      list-style: none;
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .arch-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }
    .arch-icon {
      flex-shrink: 0;
      width: 32px;
      height: 32px;
      border-radius: 6px;
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .arch-item h4 {
      font-size: 16px;
      color: var(--navy);
      margin-bottom: 4px;
    }
    .arch-item p {
      font-size: 14px;
      color: var(--text-muted);
    }
    .arch-visual-wrap {
      background: #f1f5f9;
      padding: 12px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }
    .arch-visual-wrap img {
      border-radius: 6px;
      width: 100%;
      height: 340px;
      object-fit: cover;
    }

    /* Section 3: 核心优势六卡片区 (2x3) */
    .grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-pro {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 24px;
      transition: var(--transition);
      position: relative;
    }
    .card-pro:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }
    .card-pro-tag {
      font-size: 11px;
      font-weight: 700;
      color: var(--primary);
      background: #f0f9ff;
      border: 1px solid #bae6fd;
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .card-pro h3 {
      font-size: 18px;
      margin-bottom: 10px;
      color: var(--navy);
    }
    .card-pro p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 4: 热门分析产品与功能模块 (3横排卡片) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-box {
      background: var(--bg-white);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .product-box:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .product-img-wrap {
      height: 180px;
      overflow: hidden;
      background: #e2e8f0;
    }
    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .product-box:hover .product-img-wrap img {
      transform: scale(1.04);
    }
    .product-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-body h3 {
      font-size: 18px;
      margin-bottom: 8px;
      color: var(--navy);
    }
    .product-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .product-features {
      list-style: none;
      margin-bottom: 20px;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
      flex: 1;
    }
    .product-features li {
      font-size: 13px;
      color: #475569;
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .product-features li::before {
      content: '✓';
      color: var(--accent);
      font-weight: 800;
    }

    /* Section 5: 深色架构与全景案例 */
    .case-banner {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius);
      padding: 40px;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: center;
    }
    .case-banner h3 {
      font-size: 24px;
      color: #fff;
      margin-bottom: 16px;
    }
    .case-banner p {
      color: #94a3b8;
      font-size: 15px;
      margin-bottom: 20px;
    }
    .badge-group {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }
    .tech-badge {
      background: rgba(255, 255, 255, 0.08);
      color: #e2e8f0;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .case-metric-box {
      background: rgba(15, 23, 42, 0.8);
      border: 1px solid rgba(56, 189, 248, 0.3);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
    }
    .case-metric-box strong {
      display: block;
      font-size: 42px;
      color: #38bdf8;
      line-height: 1;
      margin-bottom: 6px;
    }
    .case-metric-box span {
      font-size: 14px;
      color: #cbd5e1;
    }

    /* Section 6: 用户深度场景故事 (图文交叉) */
    .scene-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .scene-media img {
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: 320px;
      object-fit: cover;
    }
    .scene-content h3 {
      font-size: 22px;
      color: var(--navy);
      margin-bottom: 14px;
    }
    .scene-content p {
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    /* Section 7: 关键性能数据统计指标条 (4项通栏) */
    .stat-section {
      background: #0284c7;
      color: #fff;
      padding: 50px 0;
    }
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .stat-card strong {
      display: block;
      font-size: 44px;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 6px;
      color: #fff;
    }
    .stat-card p {
      font-size: 14px;
      color: #e0f2fe;
      font-weight: 500;
    }

    /* Section 8: 客户评价与专家认可度 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .review-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 14px;
    }
    .review-text {
      font-size: 14px;
      color: #475569;
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 44px;
      height: 44px;
      background: #e2e8f0;
      border-radius: 50%;
      overflow: hidden;
      flex-shrink: 0;
    }
    .reviewer-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .reviewer-info h4 {
      font-size: 14px;
      color: var(--navy);
    }
    .reviewer-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 9: 行业动态与技术资讯卡片 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--bg-white);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .news-img {
      height: 160px;
      background: #f1f5f9;
    }
    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-content {
      padding: 20px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-content h3 {
      font-size: 16px;
      margin-bottom: 8px;
      color: var(--navy);
      line-height: 1.4;
    }
    .news-content p {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 14px;
      flex: 1;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
    }

    /* Section 10: 差异化对比表 */
    .table-responsive {
      overflow-x: auto;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      background: var(--bg-white);
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      font-size: 14px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f8fafc;
      color: var(--navy);
      font-weight: 700;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .compare-highlight {
      background: #f0fdf4;
      color: #166534;
      font-weight: 600;
    }

    /* Section 11: 常见问题 FAQ 手风琴 */
    .faq-container {
      max-width: 820px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 16px;
      color: var(--navy);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafafa;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }
    .faq-answer-inner {
      padding: 18px 24px;
      border-top: 1px solid var(--border-color);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-item.active .faq-answer {
      max-height: 250px;
    }

    /* Section 12: 底部行动转化表单 */
    .cta-card {
      background: linear-gradient(135deg, #0f172a, #1e293b);
      border-radius: 12px;
      padding: 48px;
      color: #fff;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .cta-content h2 {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #fff;
    }
    .cta-content p {
      color: #cbd5e1;
      font-size: 15px;
      margin-bottom: 24px;
    }
    .cta-trust-items {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .cta-trust-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      color: #94a3b8;
    }
    .cta-trust-item::before {
      content: '✓';
      color: var(--accent);
      font-weight: bold;
    }
    .cta-form {
      background: rgba(255, 255, 255, 0.05);
      padding: 24px;
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 13px;
      color: #cbd5e1;
    }
    .form-input {
      padding: 10px 14px;
      border-radius: 6px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(15, 23, 42, 0.6);
      color: #fff;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.2);
    }

    /* Footer */
    .site-footer {
      background: #0b0f19;
      color: #94a3b8;
      font-size: 13px;
      padding: 60px 0 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 15px;
      color: #fff;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 12px;
    }

    /* Floating Bar */
    .float-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      z-index: 999;
      display: flex;
      align-items: center;
    }
    .float-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .float-info {
      display: flex;
      align-items: center;
      gap: 16px;
      color: #fff;
    }
    .float-badge {
      background: var(--accent);
      color: #fff;
      font-size: 11px;
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 700;
    }
    .float-desc {
      font-size: 14px;
      color: #cbd5e1;
    }

    /* Animations */
    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(1.15); }
    }
    @keyframes bounce {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-3px); }
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .grid-6 { grid-template-columns: repeat(2, 1fr); }
      .products-grid, .review-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-grid, .arch-grid, .case-banner, .scene-grid, .cta-card { grid-template-columns: 1fr; gap: 32px; }
      .hero-visual-card img, .arch-visual-wrap img { height: 300px; }
    }
    @media (max-width: 768px) {
      .top-bar-meta { display: none; }
      .main-nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        display: none;
      }
      .main-nav.active { display: flex; }
      .menu-toggle { display: block; }
      .grid-6, .products-grid, .review-grid, .news-grid, .stat-grid { grid-template-columns: 1fr; }
      .hero-title { font-size: 28px; }
      .section-title { font-size: 24px; }
      .float-desc { display: none; }
      .cta-card { padding: 24px; }
      .footer-grid { grid-template-columns: 1fr; }
    }