/* roulang page: index */
:root {
      --primary: #0f766e;
      --primary-hover: #0d9488;
      --dark-slate: #0f172a;
      --surface-light: #f8fafc;
      --border-subtle: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #475569;
      --accent-gold: #d97706;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
      line-height: 1.65;
    }
    .scroll-mt-header {
      scroll-margin-top: 5.5rem;
    }
    .tech-border {
      border: 1px solid rgba(226, 232, 240, 0.9);
    }
    .tech-shadow {
      box-shadow: 0 1px 3px 0 rgba(15, 23, 42, 0.04), 0 1px 2px -1px rgba(15, 23, 42, 0.04);
    }
    .tech-card-hover {
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .tech-card-hover:hover {
      transform: translateY(-3px);
      border-color: rgba(15, 118, 110, 0.35);
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
    }
    /* 手风琴状态样式 */
    .faq-panel {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.25s ease-in;
      opacity: 0;
    }
    .faq-item.active .faq-panel {
      max-height: 260px;
      opacity: 1;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }