:root {
    --primary: #007BFF;
    --success: #28a745;
    --light: #f9f9f9;
    --dark: #333;
    --accent: #ff5722;
    --font: 'Poppins', sans-serif;
  }
  
  body {
    font-family: var(--font);
    margin: 0;
    background: #f0f4f8;
    color: var(--dark);
  }
  
  header {
    display: flex;
    align-items: center;
    background: white;
    padding: 10px 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  }
  
  .site-logo {
    height: 40px;
    margin-right: 15px;
  }
  
  .site-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
  }
  
  .game-container {
    max-width: 800px;
    margin: 30px auto;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  }
  
  .header {
    text-align: center;
    margin-bottom: 20px;
  }
  
  .game-info {
    display: flex;
    justify-content: space-around;
    margin-top: 10px;
    font-weight: 600;
  }
  
  .game-area {
    text-align: center;
    margin-top: 20px;
  }
  
  .target-instruction {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 10px;
  }
  
  .game-board {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
    min-height: 60px;
  }
  
  .shape {
    padding: 15px 20px;
    background: var(--accent);
    color: white;
    font-weight: bold;
    border-radius: 8px;
  }
  
  .input-area input {
    width: 60%;
    padding: 10px;
    margin: 10px 0;
    font-size: 1rem;
  }
  
  .btn {
    padding: 10px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin-top: 10px;
  }
  
  .btn:hover {
    background: #0056b3;
  }
  
  .hidden {
    display: none;
  }
  
  .round-result {
    margin-top: 15px;
    font-weight: 600;
    color: var(--success);
  }
  
  #final-summary {
    margin-top: 30px;
    padding: 10px;
    background-color: var(--light);
    border-radius: 10px;
  }
  
  #final-summary h2 {
    color: var(--success);
    text-align: center;
    margin-bottom: 15px;
  }
  
  #final-summary table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
  }
  
  #final-summary th,
  #final-summary td {
    padding: 10px;
    border: 1px solid #ccc;
    text-align: center;
  }