html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: linear-gradient(135deg, #0f172a 0%, #172554 50%, #0f172a 100%);
  color: #e2e8f0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
#root { min-height: 100%; }
#boot-splash {
  position: fixed; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 18px;
  background: linear-gradient(135deg, #0f172a 0%, #172554 50%, #0f172a 100%);
}
#boot-splash .spinner {
  width: 38px; height: 38px; border-radius: 50%;
  border: 3px solid rgba(226,232,240,0.25); border-top-color: #60a5fa;
  animation: boot-spin 0.9s linear infinite;
}
#boot-splash .txt { font-size: 14px; letter-spacing: 0.3em; color: #cbd5e1; opacity: 0.85; }
@keyframes boot-spin { to { transform: rotate(360deg); } }