/* roulang page: index */
:root {
      --primary-color: #1e40af;
      --highlight-color: #2563eb;
      --accent-orange: #f59e0b;
      --accent-green: #10b981;
      --bg-light: #f8fafc;
      --text-dark: #0f172a;
      --text-muted: #334155;
      --text-light: #64748b;
      --card-shadow: 0 10px 25px -5px rgba(30, 64, 175, 0.06), 0 8px 10px -6px rgba(30, 64, 175, 0.04);
      --card-hover-shadow: 0 20px 30px -10px rgba(30, 64, 175, 0.12), 0 10px 15px -5px rgba(30, 64, 175, 0.08);
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }
    .card-custom {
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-custom:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(37, 99, 235, 0.12) 0%, rgba(248, 250, 252, 0) 70%);
    }
    .cta-btn-glow {
      box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.39);
    }
    .cta-btn-glow:hover {
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.55);
    }
    /* 手风琴平滑过渡 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-answer.open {
      max-height: 320px;
    }