/* roulang page: index */
:root {
      --bg-dark: #0A0D14;
      --bg-deep: #05070A;
      --bg-card: #101522;
      --primary: #1A6BFF;
      --secondary: #7928CA;
      --cyan: #00F5D4;
      --orange: #FF5A36;
      --text-main: #FFFFFF;
      --text-sub: #A0AEC0;
      --border-light: rgba(255, 255, 255, 0.08);
      --radius-card: 20px;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    .custom-container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .gradient-brand {
      background: linear-gradient(135deg, #1A6BFF 0%, #7928CA 100%);
    }
    .text-gradient {
      background: linear-gradient(135deg, #00F5D4 0%, #1A6BFF 50%, #7928CA 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .card-glass {
      background: rgba(16, 21, 34, 0.78);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease;
    }
    .card-glass:hover {
      transform: translateY(-5px);
      border-color: rgba(26, 107, 255, 0.4);
      box-shadow: 0 16px 36px rgba(26, 107, 255, 0.18);
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 9999px;
      font-size: 12px;
      background: rgba(0, 245, 212, 0.12);
      color: #00F5D4;
      border: 1px solid rgba(0, 245, 212, 0.25);
    }
    .badge-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: #00F5D4;
    }
    .btn-primary {
      background: linear-gradient(135deg, #1A6BFF 0%, #7928CA 100%);
      color: #ffffff;
      padding: 12px 28px;
      border-radius: 12px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      box-shadow: 0 4px 18px rgba(26, 107, 255, 0.35);
    }
    .btn-primary:hover {
      box-shadow: 0 6px 24px rgba(121, 40, 202, 0.5);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: rgba(255, 255, 255, 0.06);
      color: #ffffff;
      padding: 12px 28px;
      border-radius: 12px;
      font-weight: 600;
      border: 1px solid rgba(255, 255, 255, 0.15);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.12);
      border-color: rgba(255, 255, 255, 0.3);
      transform: translateY(-2px);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
      opacity: 0;
    }
    .faq-answer.open {
      max-height: 200px;
      opacity: 1;
    }