/* roulang page: index */
:root {
      --primary-gradient: linear-gradient(135deg, #0D9488 0%, #0284C7 100%);
      --accent-color: #10B981;
      --warning-color: #F59E0B;
      --bg-slate: #F8FAFC;
      --bg-mint: #F0FDFA;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-subtle: rgba(13, 148, 136, 0.12);
      --card-radius: 1.25rem;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-slate);
      color: var(--text-main);
      line-height: 1.68;
      overflow-x: hidden;
    }
    .gradient-brand {
      background: var(--primary-gradient);
    }
    .text-gradient {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .card-shadow {
      box-shadow: 0 10px 30px -5px rgba(13, 148, 136, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
    }
    .card-border {
      border: 1px solid var(--border-subtle);
    }
    .transition-card {
      transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.28s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .transition-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 35px -8px rgba(13, 148, 136, 0.16);
    }
    /* 手风琴动效 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.3s ease;
    }
    .faq-item.active .faq-content {
      max-height: 280px;
      padding-top: 0.75rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    /* 脉冲光斑动效 */
    @keyframes pulse-glow {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.45; transform: scale(1.18); }
    }
    .animate-pulse-glow {
      animation: pulse-glow 2.4s infinite ease-in-out;
    }