/* roulang page: index */
:root {
      --primary: #0F5156;
      --primary-dark: #0A373A;
      --accent: #E76F51;
      --text-main: #0F172A;
      --text-muted: #475569;
      --bg-light: #F8FAFC;
      --border-color: #E2E8F0;
    }
    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.8;
      overflow-x: hidden;
    }
    .panel-card {
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }
    .panel-card:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 24px -6px rgba(15, 81, 86, 0.12);
      border-color: #CBD5E1;
    }