/* roulang page: index */
:root {
      --primary: #6366F1;
      --primary-hover: #4F46E5;
      --secondary: #10B981;
      --warning: #F59E0B;
      --bg-dark: #0F1117;
      --card-bg: #181B26;
      --card-hover: #222634;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --text-sub: #64748B;
      --border-line: rgba(255, 255, 255, 0.08);
      --border-highlight: rgba(99, 102, 241, 0.5);
      --container-max: 1240px;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

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

    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: inherit;
      outline: none;
      border: none;
    }

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

    /* 顶部双行导航 */
    .top-utility-bar {
      background: #090B0F;
      border-bottom: 1px solid var(--border-line);
      font-size: 13px;
      color: var(--text-sub);
      height: 38px;
      display: flex;
      align-items: center;
    }

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

    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--secondary);
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--secondary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--secondary);
    }

    .main-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(15, 17, 23, 0.88);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-line);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 20px;
      letter-spacing: -0.5px;
      color: #FFFFFF;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--primary), #8B5CF6);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-weight: 800;
      font-size: 16px;
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-size: 15px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .nav-link:hover, .nav-link.active {
      color: #FFFFFF;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #7C3AED);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.55);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      color: var(--text-main);
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      background: var(--card-hover);
    }

    /* 板块通用规范 */
    .section-block {
      padding: 96px 0;
      border-bottom: 1px solid var(--border-line);
    }

    .section-title-wrap {
      margin-bottom: 56px;
      max-width: 760px;
    }

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 10px;
      letter-spacing: 1px;
    }

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

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Hero：矮横幅版式 */
    .hero-strip {
      background: linear-gradient(180deg, #161A24 0%, var(--bg-dark) 100%);
      padding: 60px 0 70px;
      border-bottom: 1px solid var(--border-line);
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-headline {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #FFFFFF 30%, #CBD5E1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-summary {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.75;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
      margin-bottom: 28px;
    }

    .badge-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      font-size: 13px;
      color: var(--text-sub);
    }

    .badge-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero-visual {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-line);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
      background: #181B26;
    }

    /* 指标看板 */
    .metrics-ribbon-block {
      background: #12151D;
      padding: 48px 0;
      border-bottom: 1px solid var(--border-line);
    }

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

    .metric-card {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      padding: 24px;
      border-radius: var(--radius-md);
      transition: var(--transition);
    }

    .metric-card:hover {
      border-color: var(--primary);
    }

    .metric-num {
      font-size: 36px;
      font-weight: 800;
      color: #FFFFFF;
      line-height: 1.1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }

    .metric-num span {
      color: var(--primary);
      font-size: 24px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 架构概览 */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .arch-specs {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 32px;
    }

    .spec-item {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      padding: 16px;
      border-radius: var(--radius-sm);
    }

    .spec-name {
      font-size: 13px;
      color: var(--text-sub);
      margin-bottom: 4px;
    }

    .spec-val {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 核心矩阵 6卡 */
    .card-grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-box {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-box:hover {
      border-color: var(--border-highlight);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    }

    .feature-icon-badge {
      width: 44px;
      height: 44px;
      background: rgba(99, 102, 241, 0.12);
      border: 1px solid rgba(99, 102, 241, 0.25);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      margin-bottom: 20px;
    }

    .feature-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .feature-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .feature-foot {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      padding-top: 14px;
      border-top: 1px solid var(--border-line);
      color: var(--text-sub);
    }

    .tag-pill {
      background: rgba(255, 255, 255, 0.05);
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
      color: #CBD5E1;
    }

    /* 套件卡片 3列 */
    .product-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .product-card {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      position: relative;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .product-card.spotlight {
      border-color: var(--primary);
      background: linear-gradient(180deg, #1D2130 0%, var(--card-bg) 100%);
    }

    .product-target {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 8px;
    }

    .product-name {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .product-summary {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 24px;
    }

    .product-params {
      list-style: none;
      margin-bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 13px;
      color: #CBD5E1;
    }

    .product-params li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .product-params li::before {
      content: "✓";
      color: var(--secondary);
      font-weight: bold;
    }

    /* 工程对比区 */
    .comparison-section {
      background: #0B0D13;
    }

    .comparison-table-wrapper {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      overflow-x: auto;
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .comparison-table th, .comparison-table td {
      padding: 20px 24px;
      border-bottom: 1px solid var(--border-line);
    }

    .comparison-table th {
      background: #141722;
      color: var(--text-sub);
      font-weight: 600;
    }

    .comparison-table td:nth-child(2) {
      color: var(--text-sub);
    }

    .comparison-table td:nth-child(3) {
      color: #FFFFFF;
      font-weight: 600;
      background: rgba(99, 102, 241, 0.04);
    }

    /* 客户故事 */
    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

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

    .story-img {
      height: 240px;
      object-fit: cover;
      width: 100%;
    }

    .story-content {
      padding: 30px;
    }

    .story-tag {
      font-size: 12px;
      color: var(--secondary);
      font-weight: 600;
      margin-bottom: 8px;
      display: inline-block;
    }

    .story-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .story-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 用户口碑 */
    .reviews-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 28px;
    }

    .review-quote {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #252A3A;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .reviewer-name {
      font-size: 15px;
      font-weight: 600;
      color: #FFFFFF;
    }

    .reviewer-role {
      font-size: 12px;
      color: var(--text-sub);
    }

    /* 资讯列表 */
    .articles-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .article-card:hover {
      border-color: var(--primary);
    }

    .article-meta {
      font-size: 12px;
      color: var(--text-sub);
      margin-bottom: 12px;
      display: flex;
      justify-content: space-between;
    }

    .article-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 12px;
      line-height: 1.45;
    }

    .article-snippet {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .article-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
    }

    /* 安全与管线保障 */
    .security-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .security-box {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .security-box h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 10px;
      color: #FFFFFF;
    }

    .security-box p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 手风琴 FAQ */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .faq-summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      user-select: none;
    }

    .faq-summary::-webkit-details-marker {
      display: none;
    }

    .faq-summary::after {
      content: "+";
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.2s ease;
    }

    details[open] .faq-summary::after {
      content: "−";
    }

    .faq-body {
      padding: 0 24px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 转化表单区 */
    .conversion-section {
      background: linear-gradient(180deg, #131722 0%, #0F1117 100%);
    }

    .conversion-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .form-wrapper {
      background: var(--card-bg);
      border: 1px solid var(--border-highlight);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
    }

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

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: #CBD5E1;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      background: #11131B;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-sm);
      padding: 12px 14px;
      color: #FFFFFF;
      font-size: 14px;
      transition: var(--transition);
    }

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

    .form-checkbox-wrap {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      margin-bottom: 24px;
      font-size: 12px;
      color: var(--text-sub);
    }

    .form-checkbox-wrap input {
      margin-top: 3px;
    }

    /* 页脚规范 */
    .main-footer {
      background: #08090D;
      border-top: 1px solid var(--border-line);
      padding: 64px 0 32px;
      font-size: 14px;
      color: var(--text-sub);
    }

    .footer-grid-4 {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-brand h3 {
      font-size: 18px;
      color: #FFFFFF;
      margin-bottom: 14px;
    }

    .footer-desc {
      font-size: 13px;
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .footer-col h4 {
      font-size: 14px;
      color: #FFFFFF;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 13px;
    }

    .footer-links a:hover {
      color: #FFFFFF;
    }

    .footer-bottom-bar {
      border-top: 1px solid var(--border-line);
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 16px;
      font-size: 12px;
    }

    /* 移动端菜单抽屉 */
    .menu-toggle {
      display: none;
      background: transparent;
      color: #FFFFFF;
      font-size: 24px;
      cursor: pointer;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .card-grid-3x2, .product-grid-3, .articles-grid-3, .reviews-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .security-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-grid, .arch-grid, .stories-grid, .conversion-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .footer-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 767px) {
      .top-utility-bar {
        display: none;
      }
      .desktop-nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: #0F1117;
        flex-direction: column;
        align-items: flex-start;
        padding: 32px 24px;
        gap: 20px;
        display: none;
        overflow-y: auto;
      }
      .desktop-nav.is-open {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .card-grid-3x2, .product-grid-3, .articles-grid-3, .reviews-grid-3, .security-grid-4 {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: 1fr 1fr;
      }
      .section-block {
        padding: 60px 0;
      }
      .hero-strip {
        padding: 40px 0 50px;
      }
      .hero-headline {
        font-size: 28px;
      }
      .footer-grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-bottom-bar {
        flex-direction: column;
      }
    }