* { margin: 0; padding: 0; box-sizing: border-box; }
    body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: #1a1a2e; color: #e0e0e0; }
    .loading-screen { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; }
    .spinner { width: 40px; height: 40px; border: 3px solid #333; border-top: 3px solid #4a90d9; border-radius: 50%; animation: spin 1s linear infinite; }
    @keyframes spin { to { transform: rotate(360deg); } }