.slider {
      position: relative;
      width: 300px;
      height: 16px;
      background: #ddd;
      border-radius: 4px;
      margin: 1rem 0;
      user-select: none;
  touch-action: pan-y;    /* allow vertical scrolling but prevent horizontal pan (so your drag stays on the slider) */

    }
]

    .slider-fill {
      position: absolute;
      height: 100%;
      background: linear-gradient(90deg, #FFCC00, #FFCC99);
      border-radius: 4px;
      width: 0;
    }

    .slider-thumb {
      position: absolute;
	width: 32px;
  	height: 32px;
  	/* add invisible padding so a finger can “grab” it even if not perfectly on the circle */
  	padding: 8px;
  	margin-top: -8px;       /* re‑center after padding increase */
      top: 50%;
      background: white;
      border: 2px solid #000000;
      border-radius: 50%;
      transform: translate(-50%, -50%);
      box-shadow: 0 2px 6px rgba(0,0,0,0.2);
      cursor: pointer;
      transition: box-shadow .2s;
    }
    .slider-thumb:active {
      box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    #controls {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    #time-display {
      font-size: 1.25rem;
      min-width: 80px;
      text-align: center;
    }
    #start-btn {
      padding: .5rem 1rem;
      font-size: 1rem;
      border: none;
      background: #4CAF50;
      color: white;
      border-radius: 4px;
      cursor: pointer;
      transition: background .2s;
    }
    #start-btn:hover {
      background: #45A049;
    }
@media (max-width: 600px) {
  .slider {
    width: 90%;           /* more responsive width */
  }
  .slider-thumb {
    width: 40px;          
    height: 40px;
    padding: 12px;
    margin-top: -12px;
  }
}