:root {
    --primary-color: #00bfff;
    --secondary-color: #121212;
    --text-color: #eaeaea;
    --card-bg: #1e1e1e;
    --card-shadow: rgba(0, 0, 0, 0.4);
  }
  
  body {
    font-family: 'Helvetica Neue', sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s ease;
  }
  
  body.light-mode {
    --primary-color: #005b96;
    --secondary-color: #f4f4f4;
    --text-color: #333;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.1);
  }
  
  header {
    text-align: center;
    margin-bottom: 40px;
  }
  
  header h1 {
    font-size: 2.8rem;
    color: var(--primary-color);
  }
  
  header p {
    margin-top: 10px;
    font-size: 1rem;
  }
  
  header p a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 8px;
    transition: color 0.3s ease;
  }
  
  header p a:hover {
    opacity: 0.8;
  }
  
  section {
    background-color: var(--card-bg);
    padding: 30px;
    margin: 20px 0;
    width: 100%;
    max-width: 900px;
    border-radius: 12px;
    box-shadow: 0 4px 10px var(--card-shadow);
    transition: transform 0.2s ease, background-color 0.3s ease;
  }
  
  section:hover {
    transform: translateY(-5px);
  }
  
  section h2 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
  }
  
  h3 {
    color: var(--text-color);
    margin-top: 20px;
  }
  
  ul {
    list-style: disc;
    padding-left: 20px;
    text-align: left;
  }
  
  ul li {
    margin-bottom: 10px;
  }
  
  #theme-toggle {
    margin-top: 30px;
    padding: 10px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 8px;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  #theme-toggle:hover {
    background-color: #0080c0;
  }