body {
    font-family: 'Segoe UI', sans-serif;
    background: #f0f4f8;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
  }
  
  .game-container {
    text-align: center;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 500px;
  }
  
  #dark-mode-toggle {
    margin-bottom: 10px;
  }
  
  #session-timer {
    font-size: 0.9rem;
    margin-bottom: 5px;
  }
  
  #high-score {
    font-size: 1rem;
    font-weight: bold;
  }
  
  .gif-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 10px;
  }
  
  #word-display {
    font-size: 2rem;
    margin-bottom: 1rem;
  }
  
  #word-input {
    font-size: 1.2rem;
    padding: 0.5rem;
    border: 2px solid #ccc;
    border-radius: 8px;
    width: 100%;
  }
  
  .stats {
    margin-top: 1rem;
    display: flex;
    justify-content: space-between;
    font-size: 1rem;
  }
  
  .tip-box {
    margin-top: 1rem;
    padding: 0.5rem;
    background: #e6f7ff;
    border-left: 5px solid #1890ff;
    border-radius: 6px;
    font-size: 0.9rem;
  }
  
  .stretch-popup {
    margin-top: 1rem;
    color: #d48806;
    font-weight: bold;
  }
  
  body.dark-mode {
    background: #1a1a1a;
    color: #ffffff;
  }
  
  body.dark-mode .game-container {
    background: #2c2c2c;
    color: #ffffff;
  }
  
  body.dark-mode input {
    background: #333;
    color: #fff;
    border: 2px solid #888;
  }