* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: #333;
      background: #f9f9f9;
      padding: 20px;
      max-width: 1400px;
      margin: 0 auto;
    }
    
    header {
      margin-bottom: 25px;
    }
    
    .sidebar {
      float: right;
      width: 250px;
      background: #f5f5f5;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
      margin-left: 25px;
      margin-bottom: 20px;
    }
    
    .sidebar h3 {
      margin-top: 0;
      color: #2c3e50;
      border-bottom: 2px solid #3498db;
      padding-bottom: 10px;
      margin-bottom: 15px;
    }
    
    .sidebar ul {
      list-style-type: none;
      margin-left: 0;
      padding-left: 0;
    }
    
    .sidebar li {
      margin-bottom: 10px;
    }
    
    .sidebar a {
      color: #2980b9;
      text-decoration: none;
      transition: color 0.3s;
      display: block;
      padding: 5px 0;
      border-bottom: 1px dashed #ddd;
    }
    
    .sidebar a:hover {
      color: #e74c3c;
      border-bottom-color: #e74c3c;
    }
    
    .content {
      margin-right: 280px;
    }
    
    h1 {
      color: #2c3e50;
      font-size: 2.5rem;
      margin-bottom: 5px;
    }
    
    h2 {
      color: #7f8c8d;
      font-weight: normal;
      font-size: 1.4rem;
      margin-bottom: 30px;
    }
    
    .section {
      background: linear-gradient(to right, #3498db, #2c3e50);
      color: white;
      padding: 12px 20px;
      margin-top: 25px;
      margin-bottom: 15px;
      border-radius: 5px;
      font-weight: bold;
      font-size: 1.2rem;
      box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    }
    
    .multi-column {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      margin-bottom: 30px;
    }
    
    .links {
      background: white;
      padding: 18px;
      border-radius: 8px;
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
      break-inside: avoid;
    }
    
    .links p {
      font-weight: bold;
      color: #2c3e50;
      margin-bottom: 12px;
      font-size: 1.1rem;
      border-bottom: 2px solid #3498db;
      padding-bottom: 8px;
    }
    
    .links li {
      list-style-type: none;
      margin-bottom: 8px;
      padding-left: 5px;
      border-left: 3px solid transparent;
      transition: all 0.2s;
    }
    
    .links li:hover {
      border-left-color: #e74c3c;
      padding-left: 10px;
    }
    
    .links a {
      color: #2980b9;
      text-decoration: none;
      display: block;
      padding: 5px 0;
      transition: color 0.3s;
    }
    
    .links a:hover {
      color: #e74c3c;
    }
    
    footer {
      clear: both;
      margin-top: 40px;
      text-align: center;
      padding: 20px;
      background: #2c3e50;
      color: white;
      border-radius: 8px;
      box-shadow: 0 -2px 15px rgba(0, 0, 0, 0.1);
    }
    
    .foot p {
      margin: 0;
      font-size: 0.9rem;
      color: #ecf0f1;
    }
    
    @media (max-width: 1000px) {
      .multi-column {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      }
    }
    
    @media (max-width: 700px) {
      .sidebar {
        float: none;
        width: 100%;
        margin-left: 0;
        margin-bottom: 30px;
      }
      
      .content {
        margin-right: 0;
      }
      
      .multi-column {
        grid-template-columns: 1fr;
      }
    }