/* roulang page: index */
:root {
      --color-brand: #0D9488;
      --color-brand-hover: #0F766E;
      --color-bg-base: #F8FAFC;
      --color-bg-muted: #F1F5F9;
      --color-text-main: #1E293B;
      --color-text-muted: #475569;
      --color-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: var(--color-text-main);
      background-color: var(--color-bg-base);
      line-height: 1.75;
    }
    .custom-container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .card-transition {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .faq-panel {
      transition: max-height 0.3s ease-out, opacity 0.25s ease-out;
    }