*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;overflow:hidden;background:linear-gradient(135deg,#667eea,#764ba2)}#app{width:100vw;height:100vh;position:relative}#canvas{display:block;width:100%;height:100%}#timer-display{position:absolute;top:30px;right:30px;background:#fffffff2;padding:20px 30px;border-radius:15px;box-shadow:0 8px 32px #0003;font-size:48px;font-weight:700;color:#333;z-index:100;display:flex;align-items:baseline;gap:5px}#time-value{color:#e74c3c}.time-unit{font-size:24px;color:#666}#presets-panel{position:absolute;top:50%;right:30px;transform:translateY(-50%);background:#fffffff2;padding:20px;border-radius:15px;box-shadow:0 8px 32px #0003;z-index:100;min-width:150px}#presets-panel h3{margin-bottom:15px;color:#333;font-size:18px;text-align:center}.preset-btn{display:block;width:100%;padding:12px;margin-bottom:10px;border:2px solid #667eea;background:#fff;color:#667eea;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s ease}.preset-btn:hover{background:#667eea;color:#fff;transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}.preset-btn:active{transform:translateY(0)}.preset-btn:last-child{margin-bottom:0}#presets-panel h3:not(:first-child){margin-top:20px}#sound-select{width:100%;padding:10px;border:2px solid #667eea;border-radius:8px;font-size:14px;background:#fff;color:#333;cursor:pointer;margin-bottom:10px}#sound-select:focus{outline:none;border-color:#764ba2}#test-sound-btn{width:100%;padding:8px;border:2px solid #27ae60;background:#fff;color:#27ae60;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all .3s ease}#test-sound-btn:hover{background:#27ae60;color:#fff}.volume-control{margin:15px 0}.volume-control label{display:block;font-size:12px;color:#666;margin-bottom:5px}#volume-slider{width:70%;height:6px;border-radius:3px;background:#ddd;outline:none;-webkit-appearance:none;vertical-align:middle}#volume-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:16px;height:16px;border-radius:50%;background:#667eea;cursor:pointer}#volume-slider::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#667eea;cursor:pointer;border:none}#volume-value{display:inline-block;width:40px;text-align:right;font-size:12px;color:#667eea;font-weight:600;margin-left:10px}#controls{position:absolute;bottom:50px;left:50%;transform:translate(-50%);display:flex;gap:20px;z-index:100}#controls button{padding:15px 40px;border:none;border-radius:50px;font-size:18px;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #0003}#start-btn{background:#27ae60;color:#fff}#start-btn:hover:not(:disabled){background:#229954;transform:translateY(-2px);box-shadow:0 6px 20px #27ae6066}#stop-btn{background:#e74c3c;color:#fff}#stop-btn:hover:not(:disabled){background:#c0392b;transform:translateY(-2px);box-shadow:0 6px 20px #e74c3c66}#reset-btn{background:#7f8c8d;color:#fff}#reset-btn:hover{background:#636e72;transform:translateY(-2px);box-shadow:0 6px 20px #7f8c8d66}#controls button:disabled{opacity:.5;cursor:not-allowed}#controls button:active:not(:disabled){transform:translateY(0)}#canvas.timer-running{pointer-events:none}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}