/* roulang page: index */
:root {
      --bg-primary: #FAFAFB;
      --bg-secondary: #F3F4F6;
      --bg-dark: #090D16;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --primary: #0284C7;
      --primary-hover: #0369A1;
      --primary-focus: rgba(2, 132, 199, 0.15);
      --accent-green: #10B981;
      --border-color: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.1);
      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.06);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --font-sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --font-mono: "JetBrains Mono", "Fira Code", monospace;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-primary);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 15px;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section {
      padding: 96px 0;
      position: relative;
    }

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

    .section-dark {
      background-color: var(--bg-dark);
      color: #F8FAFC;
    }

    .section-dark .section-desc {
      color: var(--text-light);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 56px;
    }

    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      background: rgba(2, 132, 199, 0.08);
      color: var(--primary);
      border-radius: 999px;
      font-size: 12px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 16px;
    }

    .section-dark .section-badge {
      background: rgba(2, 132, 199, 0.2);
      color: #38BDF8;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      line-height: 1.3;
    }

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

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 2px 4px rgba(2, 132, 199, 0.2);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 12px rgba(2, 132, 199, 0.25);
    }

    .btn-secondary {
      background-color: #FFFFFF;
      color: var(--text-main);
      border-color: var(--border-color);
    }

    .btn-secondary:hover {
      border-color: var(--text-main);
      background-color: #FAFAFA;
      transform: translateY(-2px);
    }

    .btn-outline-white {
      background-color: transparent;
      color: #FFFFFF;
      border-color: rgba(255, 255, 255, 0.3);
    }

    .btn-outline-white:hover {
      background-color: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
      transform: translateY(-2px);
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

    .top-bar {
      background-color: var(--bg-dark);
      color: var(--text-light);
      font-size: 12px;
      padding: 6px 0;
      border-bottom: 1px solid var(--border-dark);
    }

    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
    }

    .brand-logo i {
      color: var(--primary);
      font-size: 24px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
    }

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

    .nav-cta-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 20px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏 Banner */
    .hero-section {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(2, 132, 199, 0.06) 0%, transparent 60%),
                  linear-gradient(180deg, #FFFFFF 0%, var(--bg-primary) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 64px;
      align-items: center;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-tag .status-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-green);
      border-radius: 50%;
      box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
    }

    .hero-title {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.18;
      letter-spacing: -0.03em;
      margin-bottom: 20px;
      color: var(--text-main);
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-muted);
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    .hero-trust-bar {
      display: flex;
      align-items: center;
      gap: 24px;
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
    }

    .trust-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .trust-item i {
      color: var(--accent-green);
    }

    .hero-visual {
      position: relative;
    }

    .hero-img-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 8px;
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .hero-img-box img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    .hero-floating-card {
      position: absolute;
      bottom: -20px;
      left: -20px;
      background: #FFFFFF;
      padding: 16px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .hero-floating-card .metric {
      font-family: var(--font-mono);
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1;
    }

    .hero-floating-card .metric-label {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 4px;
    }

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

    .arch-stack {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .stack-layer {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .stack-layer:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .stack-info h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 2px;
    }

    .stack-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    .stack-badge {
      font-family: var(--font-mono);
      font-size: 11px;
      background: var(--bg-secondary);
      padding: 4px 8px;
      border-radius: 4px;
      color: var(--text-muted);
    }

    .spec-table {
      width: 100%;
      border-collapse: collapse;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }

    .spec-table th, .spec-table td {
      padding: 14px 20px;
      text-align: left;
      font-size: 13px;
      border-bottom: 1px solid var(--border-color);
    }

    .spec-table th {
      background: var(--bg-secondary);
      font-weight: 600;
      color: var(--text-muted);
    }

    .spec-table td.val {
      font-family: var(--font-mono);
      font-weight: 600;
      color: var(--primary);
    }

    /* 六维网格 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: all 0.2s ease;
    }

    .feature-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .feature-icon {
      width: 44px;
      height: 44px;
      background: rgba(2, 132, 199, 0.08);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 20px;
    }

    .feature-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

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

    /* 发行版套件 */
    .edition-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: all 0.2s ease;
    }

    .edition-card.featured {
      border-color: var(--primary);
      box-shadow: 0 8px 30px rgba(2, 132, 199, 0.12);
    }

    .featured-tag {
      position: absolute;
      top: -12px;
      right: 28px;
      background: var(--primary);
      color: #FFFFFF;
      font-size: 11px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 999px;
      text-transform: uppercase;
    }

    .edition-name {
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .edition-desc {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
      min-height: 42px;
    }

    .edition-specs {
      list-style: none;
      margin-bottom: 32px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      flex-grow: 1;
    }

    .edition-specs li {
      font-size: 13px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-main);
    }

    .edition-specs li i {
      color: var(--accent-green);
      font-size: 14px;
    }

    /* 深色技术理念区 */
    .tech-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .code-window {
      background: #0F172A;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      overflow: hidden;
      font-family: var(--font-mono);
    }

    .code-header {
      background: #1E293B;
      padding: 10px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .code-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }

    .dot-red { background: #EF4444; }
    .dot-yellow { background: #F59E0B; }
    .dot-green { background: #10B981; }

    .code-body {
      padding: 20px;
      font-size: 13px;
      line-height: 1.7;
      color: #E2E8F0;
      overflow-x: auto;
    }

    .code-body .token-kw { color: #F43F5E; }
    .code-body .token-fn { color: #38BDF8; }
    .code-body .token-str { color: #34D399; }
    .code-body .token-comment { color: #64748B; }

    /* 场景卡片 */
    .scene-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .scene-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .scene-img-box {
      height: 180px;
      overflow: hidden;
    }

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

    .scene-card:hover .scene-img-box img {
      transform: scale(1.04);
    }

    .scene-content {
      padding: 20px;
    }

    .scene-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .scene-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 效能故事 */
    .story-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .story-metrics {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 24px;
    }

    .story-metric-item {
      background: var(--bg-secondary);
      padding: 16px;
      border-radius: var(--radius-sm);
    }

    .story-metric-num {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
    }

    .story-metric-label {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 数据指标条 */
    .stat-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item {
      padding: 24px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .stat-num {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .stat-num span {
      color: var(--primary);
      font-size: 20px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 对比表格 */
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      text-align: center;
      font-size: 14px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th:first-child, .compare-table td:first-child {
      text-align: left;
      font-weight: 600;
    }

    .compare-table th {
      background: var(--bg-secondary);
      font-weight: 700;
    }

    .compare-table th.highlight, .compare-table td.highlight {
      background: rgba(2, 132, 199, 0.04);
      color: var(--primary);
      font-weight: 700;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .faq-item summary {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 15px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

    .faq-item summary::after {
      content: "\f078";
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      font-size: 12px;
      color: var(--text-light);
      transition: transform 0.2s ease;
    }

    .faq-item[open] summary::after {
      transform: rotate(180deg);
      color: var(--primary);
    }

    .faq-content {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }

    /* 转化区与表单 */
    .conversion-box {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      border-radius: var(--radius-lg);
      padding: 64px 48px;
      color: #FFFFFF;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 56px;
      align-items: center;
    }

    .conversion-form {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-md);
      color: var(--text-main);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--primary-focus);
    }

    /* 资质背书条 */
    .trust-badge-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 48px;
    }

    .trust-badge-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 20px;
      border-radius: var(--radius-sm);
      text-align: center;
    }

    .trust-badge-card i {
      font-size: 24px;
      color: #38BDF8;
      margin-bottom: 8px;
    }

    .trust-badge-card h5 {
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 4px;
    }

    .trust-badge-card p {
      font-size: 12px;
      color: var(--text-light);
    }

    /* 页脚 */
    .site-footer {
      background: #070A10;
      color: var(--text-light);
      padding: 80px 0 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      font-size: 13px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 56px;
    }

    .footer-brand h3 {
      font-size: 18px;
      color: #FFFFFF;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 14px;
      margin-bottom: 18px;
      font-weight: 600;
    }

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

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-grid, .tech-grid, .story-box, .conversion-box {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .card-grid-3, .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-bar, .trust-badge-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-links, .nav-cta-group .btn { display: none; }
      .mobile-toggle { display: block; }
      .hero-title { font-size: 32px; }
      .card-grid-3, .card-grid-4, .stat-bar, .trust-badge-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }