* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    background: #e0f7fa;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    text-align: center;
    color: #00796b;
  }
  
  .container {
    max-width: 300px;
  }
  
  h1 {
    margin-bottom: 40px;
  }
  
  .circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: #b2dfdb;
    margin: 0 auto 20px;
    transition: transform 4s ease-in-out;
  }
  
  button {
    padding: 10px 20px;
    background: #00796b;
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    cursor: pointer;
  }
  
  button:hover {
    background: #004d40;
  }
  
  .instructions {
    margin-top: 40px;
    margin-bottom: 10px;
    font-size: 18px;
  }

  body.dark {
    background-color: #121212;
    color: #f0f0f0;
  }
  
  body.dark #circle {
    background-color: #37474f;
  }
  
  .theme-toggle, .whatsapp-share {
    margin: 5px;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 25px;
    border: none;
    cursor: pointer;
  }
  
  .theme-toggle {
    background-color: #333;
    color: #fff;
  }
  
  .whatsapp-share {
    background-color: #25d366;
    color: white;
  }

  body.dark {
    background-color: #121212;
    color: #f0f0f0;
  }
  
  body.dark h1,
  body.dark p {
    color: #f0f0f0;
  }
  
  body.dark #circle {
    background-color: #37474f;
  }
  
  body.dark select,
  body.dark button {
    background-color: #333;
    color: #fff;
    border: 1px solid #555;
  }

  .extra-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
  }
  
  .theme-toggle, .whatsapp-share {
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 25px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
  }
  
  .theme-toggle {
    background-color: #333;
    color: #fff;
  }
  
  .whatsapp-share {
    background-color: #25d366;
    color: white;
  }
  
  .controls {
    margin-top: 20px;
  }
  
  .main-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
  }
  
  .ambient-select select {
    padding: 10px;
    border-radius: 25px;
    border: 1px solid #999;
    font-size: 14px;
  }
  
  body.dark .ambient-select select {
    background-color: #333;
    color: #fff;
    border: 1px solid #555;
  }
  
  .feedback-btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 24px;
    background-color: #4CAF50;
    color: white;
    text-decoration: none;
    font-weight: bold;
    border-radius: 8px;
    transition: background-color 0.3s;
  }
  
  .feedback-btn:hover {
    background-color: #388E3C;
  }

  .footer{
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: #999;
  }
  
  .footer-link {
    display: inline-block;
    margin-top: 20px;
    text-decoration: none;
    font-weight: bold;
    color: #4CAF50;
    transition: color 0.3s;
  }
  
  .footer-link:hover {
    color: #388E3C;
  }