/* roulang page: index */
:root {
      --bg-dark: #070d18;
      --bg-surface: #0e1726;
      --bg-card: #141f33;
      --bg-card-hover: #1b2944;
      --primary: #00ff87;
      --primary-dim: rgba(0, 255, 135, 0.12);
      --primary-border: rgba(0, 255, 135, 0.4);
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --border-line: #1e293b;
      --radius: 8px;
      --container-max: 1200px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Helvetica Neue", sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

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

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(7, 13, 24, 0.88);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-line);
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .site-brand {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.02em;
    }

    .brand-dot {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 10px var(--primary);
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-link {
      font-size: 0.95rem;
      color: var(--text-muted);
      transition: color 0.2s ease;
      font-weight: 500;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: #070d18;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 8px 18px;
      border-radius: 4px;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: inline-block;
    }

    .nav-cta:hover {
      transform: scale(1.02);
      box-shadow: 0 0 16px rgba(0, 255, 135, 0.4);
    }

    /* 通用板块规范 */
    section {
      padding: 84px 0;
      border-bottom: 1px solid var(--border-line);
      position: relative;
    }

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

    .section-header {
      margin-bottom: 48px;
      max-width: 820px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary);
      background: var(--primary-dim);
      border: 1px solid var(--primary-border);
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      line-height: 1.25;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.02em;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 按钮通用 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 26px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: var(--radius);
      cursor: pointer;
      border: none;
      transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
    }

    .btn-primary {
      background: var(--primary);
      color: #070d18;
    }

    .btn-primary:hover {
      transform: scale(1.02);
      background: #05f07f;
    }

    .btn-outline {
      background: transparent;
      color: var(--text-main);
      border: 1px solid var(--border-line);
    }

    .btn-outline:hover {
      border-color: var(--text-muted);
      background: rgba(255, 255, 255, 0.03);
    }

    /* 1. Hero 板块（试用申请/权益/资格） */
    .hero-section {
      padding: 96px 0 84px;
      background: radial-gradient(circle at 80% 20%, rgba(0, 255, 135, 0.08) 0%, transparent 60%), #070d18;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-badge-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 20px;
    }

    .hero-h1 {
      font-size: 2.75rem;
      line-height: 1.18;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -0.03em;
    }

    .hero-p {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.75;
    }

    .hero-action-group {
      display: flex;
      gap: 16px;
      align-items: center;
      flex-wrap: wrap;
    }

    .hero-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 32px;
      position: relative;
    }

    .hero-card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .hero-card-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 24px;
    }

    .hero-card-item {
      display: flex;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .hero-card-item span.icon {
      color: var(--primary);
      font-weight: 700;
    }

    /* 2. 痛点清单 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .pain-card {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: border-color 0.2s ease;
    }

    .pain-card:hover {
      border-color: rgba(255, 255, 255, 0.2);
    }

    .pain-num {
      font-size: 0.85rem;
      color: #ef4444;
      font-weight: 700;
      margin-bottom: 8px;
      letter-spacing: 0.05em;
    }

    .pain-problem {
      font-size: 1.1rem;
      font-weight: 600;
      color: #fca5a5;
      margin-bottom: 8px;
    }

    .pain-solution {
      font-size: 0.95rem;
      color: var(--text-muted);
      border-top: 1px dashed var(--border-line);
      padding-top: 12px;
      margin-top: 8px;
    }

    .pain-solution strong {
      color: var(--primary);
    }

    /* 3. 解决方案 (服务矩阵) */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 28px;
      transition: transform 0.2s ease, border-color 0.2s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary-border);
    }

    .service-title {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .service-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .service-tech {
      font-size: 0.8rem;
      color: var(--primary);
      background: rgba(0, 255, 135, 0.06);
      padding: 6px 10px;
      border-radius: 4px;
      display: inline-block;
    }

    /* 4. 场景演示 (带本地图片) */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scenario-card {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .scenario-img-wrap {
      height: 200px;
      overflow: hidden;
      background: #0f172a;
    }

    .scenario-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .scenario-card:hover .scenario-img-wrap img {
      transform: scale(1.05);
    }

    .scenario-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .scenario-title {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .scenario-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex: 1;
    }

    /* 5. 核心优势与性能阈值 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .adv-card {
      border: 1px solid var(--border-line);
      background: var(--bg-surface);
      border-radius: var(--radius);
      padding: 28px;
      position: relative;
    }

    .adv-metric {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 10px;
      font-family: monospace;
    }

    .adv-title {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .adv-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
    }

    /* 6. 深色技术理念区 */
    .concept-section {
      background: #02060d;
      border-top: 1px solid #111827;
      border-bottom: 1px solid #111827;
    }

    .concept-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .concept-item {
      border-left: 2px solid var(--primary);
      padding-left: 20px;
    }

    .concept-heading {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #ffffff;
    }

    .concept-p {
      font-size: 0.95rem;
      color: #94a3b8;
      line-height: 1.6;
    }

    /* 7. 案例实战 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .case-card {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 32px;
    }

    .case-tag {
      font-size: 0.8rem;
      color: var(--primary);
      margin-bottom: 12px;
      display: inline-block;
      font-weight: 600;
    }

    .case-title {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .case-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 20px;
    }

    .case-stats {
      display: flex;
      gap: 24px;
      border-top: 1px solid var(--border-line);
      padding-top: 18px;
    }

    .case-stat-item strong {
      display: block;
      font-size: 1.25rem;
      color: var(--text-main);
    }

    .case-stat-item span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 8. 用户故事与客户口碑 */
    .story-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .story-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .story-quote {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }

    .story-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .story-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--border-line);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .story-info h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .story-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 9. 关键性能数据统计 (KPI Stats) */
    .kpi-section {
      background: #091222;
    }

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

    .kpi-card {
      padding: 24px 12px;
    }

    .kpi-val {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
      letter-spacing: -0.02em;
    }

    .kpi-label {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 10. 资讯列表与技术文献 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .news-card {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .news-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }

    .news-title {
      font-size: 1.15rem;
      font-weight: 600;
      line-height: 1.4;
      margin-bottom: 12px;
      color: var(--text-main);
    }

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

    .news-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex: 1;
    }

    .news-link {
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 11. 部署架构套餐对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }

    .pricing-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 36px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .pricing-card.featured {
      border-color: var(--primary);
      box-shadow: 0 0 24px rgba(0, 255, 135, 0.1);
    }

    .pricing-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary);
      color: #070d18;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 4px;
    }

    .pricing-tier {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .pricing-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      min-height: 48px;
    }

    .pricing-features {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 32px;
      flex: 1;
    }

    .pricing-features li {
      font-size: 0.9rem;
      color: var(--text-muted);
      display: flex;
      gap: 8px;
    }

    .pricing-features li span {
      color: var(--primary);
    }

    /* 12. 运行保障条 */
    .guarantee-bar {
      background: var(--bg-card);
      border-top: 1px solid var(--border-line);
      border-bottom: 1px solid var(--border-line);
      padding: 40px 0;
    }

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

    .guarantee-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .guarantee-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-dim);
      border: 1px solid var(--primary-border);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      flex-shrink: 0;
    }

    .guarantee-text h4 {
      font-size: 1rem;
      margin-bottom: 4px;
    }

    .guarantee-text p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 13. 常见问题 (手风琴) */
    .faq-wrap {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      margin-bottom: 14px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 14. 转化表单与技术需求评估 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
      align-items: center;
    }

    .contact-form {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius);
      padding: 36px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      height: 46px;
      background: var(--bg-dark);
      border: 1px solid var(--border-line);
      border-radius: 4px;
      padding: 0 16px;
      color: var(--text-main);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
    }

    textarea.form-control {
      height: 110px;
      padding: 12px 16px;
      resize: vertical;
    }

    /* 页脚 */
    footer.site-footer {
      background: #040810;
      padding: 64px 0 32px;
      border-top: 1px solid var(--border-line);
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 48px;
    }

    .footer-brand {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-nav-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #111a2e;
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .contact-grid {
        grid-template-columns: 1fr;
      }
      .service-grid, .scenario-grid, .advantage-grid, .concept-grid, .news-grid, .pricing-grid, .story-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-inner .main-nav {
        display: none; /* 简化移动端导航逻辑 */
      }
      .section-title {
        font-size: 1.75rem;
      }
      .service-grid, .scenario-grid, .advantage-grid, .concept-grid, .news-grid, .pricing-grid, .story-grid, .pain-grid, .guarantee-grid, .kpi-grid, .case-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }