body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: linear-gradient(135deg, #c9d6ff, #e2e2e2);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 2rem;
    height: 100vh;
    margin: 0;
    padding-top: 4rem;
  }

  .card {
    background: white;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border-radius: 16px;
    padding: 2rem;
    width: 300px;
    text-align: center;
    transition: transform 0.3s ease;
  }
  .card:hover { transform: translateY(-5px); }

  h2 {
    font-size: 1.4rem;
    color: #444;
    margin-bottom: 1rem;
  }

  .timer-display {
    font-size: 3rem;
    font-weight: bold;
    color: #222;
    margin: 1rem 0;
  }

  p {
    color: #666;
    min-height: 24px;
  }

  button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 8px;
    background: #0078d7;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: 0.3s;
  }
  button:disabled {
    background: #bbb;
    cursor: not-allowed;
  }
  button:hover:enabled {
    background: #005cbf;
  }

  .circle {
    width: 100px;
    height: 100px;
    margin: 1rem auto 0;
    border-radius: 50%;
    background: gray;
    transition: 0.3s;
  }
  .pulse {
    animation: pulse 0.8s infinite;
  }
  @keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
  }