/* roulang page: index */
:root {
      --bg-canvas: #F8F9FA;
      --bg-dark: #0F141A;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-sub: #94A3B8;
      --c-primary: #1E293B;
      --c-glacier: #0EA5E9;
      --c-bronze: #C5A880;
      --border-light: rgba(226, 232, 240, 0.85);
    }
    body {
      background-color: var(--bg-canvas);
      color: var(--text-main);
      font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      -webkit-font-smoothing: antialiased;
    }
    .custom-border {
      border: 1px solid var(--border-light);
    }
    .subtle-shadow {
      box-shadow: 0 4px 20px -4px rgba(15, 23, 42, 0.05);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 20, 26, 0.92) 0%, rgba(30, 41, 59, 0.86) 60%, rgba(14, 165, 233, 0.35) 100%);
    }
    .card-transition {
      transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, box-shadow 0.3s ease;
    }
    .card-transition:hover {
      transform: translateY(-3px);
      border-color: rgba(14, 165, 233, 0.4);
      box-shadow: 0 12px 30px -8px rgba(14, 165, 233, 0.12);
    }
    .number-display {
      font-feature-settings: "tnum";
      font-variant-numeric: tabular-nums;
    }