/* roulang page: index */
:root {
      --primary-color: #1E40AF;
      --accent-color: #0284C7;
      --success-color: #10B981;
      --bg-slate: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --shadow-soft: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 20px 30px -10px rgba(15, 23, 42, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.06);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Lantinghei SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.7;
      overflow-x: hidden;
    }
    .card-shadow {
      box-shadow: var(--shadow-soft);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-shadow:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .rank-num {
      font-variant-numeric: tabular-nums;
    }