:root {
  --lt-bg: #f8fafc;
  --lt-surface: #ffffff;
  --lt-border: #e2e8f0;
  --lt-text: #0f172a;
  --lt-muted: #64748b;
  --lt-primary: #1e3a5f;
  --lt-accent: #2563eb;
  --lt-success: #059669;
  --lt-warning: #d97706;
  --lt-danger: #dc2626;
  --lt-radius: 12px;
  --lt-shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
  --lt-shadow-lg: 0 8px 24px rgba(15, 23, 42, 0.12);
  --lt-font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}