/* roulang page: index */
:root {
      --bg-base: #FAFBFC;
      --text-main: #0F172A;
      --text-sub: #334155;
      --primary: #6366F1;
      --secondary: #06B6D4;
      --border-color: rgba(15, 23, 42, 0.08);
      --card-radius: 10px;
    }
    html {
      scroll-behavior: smooth;
      font-family: var(--font-sans, sans-serif);
      background-color: var(--bg-base);
      color: var(--text-main);
    }
    .custom-container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .border-subtle {
      border: 1px solid var(--border-color);
    }
    .hover-lift {
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hover-lift:hover {
      transform: translateY(-3px);
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      border-color: rgba(99, 102, 241, 0.35);
    }
    /* 手风琴折叠动画 */
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }