:root {
  --bg: #f7f8fb;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-soft: #eef2f7;
  --surface-2: #e5ebf4;
  --border: rgba(37, 99, 235, 0.16);
  --text-1: #101827;
  --text-2: #46556b;
  --text-3: #7b8798;
  --accent: #2563eb;
  --accent-2: #06b6d4;
  --bg-accent: rgba(37, 99, 235, 0.08);
  --radius: 8px;
  --shadow: 0 24px 60px rgba(28, 45, 78, 0.14);
  --grad: linear-gradient(135deg, #2563eb, #06b6d4 58%, #94a3b8);
}

.theme-stage {
  background:
    radial-gradient(circle at 18% 18%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 30%),
    linear-gradient(140deg, #ffffff, #f7f8fb 52%, #e9eef7);
}

.theme-rail {
  border-left: 4px solid var(--accent);
  padding-left: 18px;
}

.theme-metal {
  background: linear-gradient(135deg, #ffffff, #e5ebf4 48%, #f8fafc);
}