*{margin:0;padding:0;box-sizing:border-box}body{background-color:#1a1a2e;color:#eee;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;overflow:hidden;width:100vw;height:100vh}#game-container{display:flex;justify-content:center;align-items:center;width:100vw;height:100vh}#game-container canvas{display:block}#hud{position:fixed;top:0;left:0;right:0;z-index:10;pointer-events:none}.hud-top{display:flex;justify-content:center;align-items:center;gap:24px;padding:12px 20px;background:#0009;font-size:16px}#level-name{font-weight:700;color:gold}#move-counter{color:#ccc}#timer{color:#aaa;font-variant-numeric:tabular-nums}.hud-buttons{display:flex;justify-content:center;gap:8px;padding:8px;pointer-events:all}.hud-buttons button{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#eee;font-size:20px;width:40px;height:40px;border-radius:6px;cursor:pointer;transition:background .15s}.hud-buttons button:hover{background:#ffffff40}.tooltip{position:fixed;bottom:80px;left:50%;transform:translate(-50%);background:#000000d9;color:gold;padding:12px 24px;border-radius:8px;font-size:16px;text-align:center;max-width:400px;pointer-events:none;transition:opacity .3s}.tooltip.hidden{opacity:0;pointer-events:none}#level-select-overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:100;display:flex;justify-content:center;align-items:center}#level-select-overlay.hidden{display:none}.level-select-backdrop{position:absolute;top:0;left:0;right:0;bottom:0;background:#000000b3}.level-select-panel{position:relative;background:#2a2a4a;border-radius:12px;padding:24px;max-width:480px;width:90%}.level-select-panel h2{text-align:center;margin-bottom:16px;color:gold}.level-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.level-cell{display:flex;flex-direction:column;align-items:center;justify-content:center;background:#ffffff14;border-radius:8px;padding:10px 4px;min-height:70px;cursor:pointer;transition:background .15s}.level-cell:hover{background:#ffffff26}.level-cell.locked{opacity:.4;cursor:not-allowed}.level-cell.locked:hover{background:#ffffff14}.level-number{font-size:18px;font-weight:700}.lock-icon{font-size:14px;margin-top:4px}.stars{font-size:12px;margin-top:2px}.best-moves{font-size:10px;color:#aaa;margin-top:2px}#completion-stats{position:fixed;top:0;left:0;right:0;bottom:0;z-index:50;display:flex;justify-content:center;align-items:center;background:#00000080;pointer-events:none}.stats-content{background:#2a2a4a;border:2px solid #ffd700;border-radius:12px;padding:24px 40px;text-align:center}.stats-content h2{color:gold;margin-bottom:12px}.stats-content .stars{font-size:28px;margin-top:8px}#congratulations{position:fixed;top:0;left:0;right:0;bottom:0;z-index:50;display:flex;justify-content:center;align-items:center;background:#000000b3}.congrats-content{background:#2a2a4a;border:3px solid #ffd700;border-radius:16px;padding:40px;text-align:center}.congrats-content h1{color:gold;margin-bottom:16px}.congrats-content button{margin-top:20px;padding:10px 24px;background:gold;color:#1a1a2e;border:none;border-radius:8px;font-size:16px;font-weight:700;cursor:pointer}.congrats-content button:hover{background:#ffed4a}#help-overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:100;display:flex;justify-content:center;align-items:center}.help-backdrop{position:absolute;top:0;left:0;right:0;bottom:0;background:#000000b3}.help-panel{position:relative;background:#2a2a4a;border:2px solid #ffd700;border-radius:12px;padding:28px 36px;max-width:420px;width:90%;text-align:center}.help-panel h2{color:gold;margin-bottom:12px}.help-panel p{margin-bottom:12px;line-height:1.5}.help-controls{margin:16px auto;border-collapse:collapse;text-align:left}.help-controls td{padding:6px 12px}.help-controls td:first-child{text-align:right;color:#aaa}.help-controls kbd{background:#ffffff1f;border:1px solid rgba(255,255,255,.25);border-radius:4px;padding:2px 8px;font-family:inherit;font-size:13px}.help-tip{color:gold;font-size:14px;font-style:italic}#btn-close-help{margin-top:16px;padding:10px 28px;background:gold;color:#1a1a2e;border:none;border-radius:8px;font-size:16px;font-weight:700;cursor:pointer}#btn-close-help:hover{background:#ffed4a}