/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-hover: #1e40af;
      --accent: #0ea5e9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-light: #f8fafc;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-card: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 20px 30px -10px rgba(37, 99, 235, 0.12);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
      line-height: 1.6;
    }

    .card-transition {
      transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #93c5fd;
    }

    .dot-pattern {
      background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
      background-size: 24px 24px;
    }

    .mono-num {
      font-feature-settings: "tnum";
      font-variant-numeric: tabular-nums;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }

    .pulse-dot {
      animation: pulseAnimation 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    }
    @keyframes pulseAnimation {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: .4; transform: scale(0.9); }
    }