.demo-container {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 30px;
    border-radius: 15px;
    margin: 25px 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  }
  
  .demo-box {
    width: 100px;
    height: 100px;
    background: #ff6b6b;
    margin: 20px auto;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 14px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  }
  
  .demo-1 {
    transition-property: background-color;
    transition-duration: 0.5s;
  }
  
  .demo-1:hover {
    background-color: #4ecdc4;
  }
  
  .demo-2 {
    transition-property: transform;
    transition-duration: 0.4s;
  }
  
  .demo-2:hover {
    transform: scale(1.2) rotate(15deg);
  }
  
  .demo-3 {
    transition-property: background-color, transform;
    transition-duration: 0.3s;
  }
  
  .demo-3:hover {
    background-color: #45b7d1;
    transform: translateY(-10px);
  }
  
  .demo-4 {
    transition-property: all;
    transition-duration: 0.6s;
  }
  
  .demo-4:hover {
    background-color: #f39c12;
    transform: scale(1.1);
    border-radius: 50%;
    box-shadow: 0 8px 25px rgba(243, 156, 18, 0.4);
  }
  
  .demo-5 {
    transition-property: none;
    transition-duration: 0.5s;
  }
  
  .demo-5:hover {
    background-color: #e74c3c;
    transform: scale(1.3);
  }
  
  .code-block {
    background: #2d3748;
    color: #e2e8f0;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    overflow-x: auto;
    border-left: 4px solid #4299e1;
  }
  
  .syntax-highlight {
    color: #63b3ed;
  }
  
  .value-highlight {
    color: #68d391;
  }
  
  .comment {
    color: #a0aec0;
    font-style: italic;
  }
  
  .property-table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  }
  
  .property-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: 600;
  }
  
  .property-table td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
  }
  
  .property-table tr:hover {
    background-color: #f8f9fa;
  }
  
  .warning-box {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
    border-left: 4px solid #fdcb6e;
  }
  
  .info-box {
    background: #d1ecf1;
    border: 1px solid #bee5eb;
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
    border-left: 4px solid #17a2b8;
  }
  
  .performance-demo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 25px 0;
  }
  
  .performance-box {
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    color: white;
    font-weight: bold;
    cursor: pointer;
  }
  
  .good-performance {
    background: #27ae60;
    transition-property: transform, opacity;
    transition-duration: 0.3s;
  }
  
  .good-performance:hover {
    transform: translateY(-5px);
    opacity: 0.9;
  }
  
  .bad-performance {
    background: #e74c3c;
    transition-property: width, height, top, left;
    transition-duration: 0.3s;
  }
  
  .bad-performance:hover {
    width: 110%;
    height: 110%;
  }
  
  .interactive-playground {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin: 30px 0;
    border: 2px solid #e9ecef;
  }
  
  .controls {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
  }
  
  .control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
  }
  
  .control-group label {
    font-weight: 600;
    color: #495057;
    font-size: 14px;
  }
  
  .control-group select, .control-group input {
    padding: 8px 12px;
    border: 2px solid #dee2e6;
    border-radius: 6px;
    font-size: 14px;
  }
  
  .control-group select:focus, .control-group input:focus {
    outline: none;
    border-color: #4299e1;
  }
  
  .playground-box {
    width: 120px;
    height: 120px;
    background: #6c5ce7;
    margin: 20px auto;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition-duration: 0.5s;
  }