*{box-sizing:border-box}:root{--bg-app: #0a0a0a;--bg-panel: #1a1a2e;--bg-surface: #111111;--bg-editor: #1e1e1e;--bg-editor-header: #252526;--bg-input: #111111;--bg-pass: #052e16;--bg-fail: #1a0000;--bg-hint: #1a1500;--bg-explain: #0f172a;--bg-solution: #0a1628;--text-primary: #d4d4d4;--text-strong: #e0e0e0;--text-muted: #888888;--text-subtle: #666666;--text-on-accent: #ffffff;--text-inverse: #11111b;--border-default: #333333;--border-muted: #444444;--border-strong: #555555;--accent: #3b82f6;--accent-2: #7c3aed;--success: #22c55e;--danger: #ef4444;--warning: #f59e0b;--info: #60a5fa;--info-muted: #94a3b8;--info-border: #475569;--node-locked: #374151;--node-unlocked: #3b82f6;--node-learning: #eab308;--node-mature: #22c55e;--node-lapsed: #ef4444}body{margin:0;padding:0;background-color:var(--bg-app);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{min-height:100vh}@keyframes spin{to{transform:rotate(360deg)}}