* {
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    background: #f1faff;
    color: #333;
    line-height: 1.6;
  }
  
  .container {
    max-width: 1100px;
    margin: auto;
    padding: 2rem;
  }
  
  header {
    background: linear-gradient(to right, #007cf0, #00dfd8);
    color: white;
    text-align: center;
    padding: 4rem 2rem;
    border-bottom-left-radius: 50px;
    border-bottom-right-radius: 50px;
  }
  
  nav {
    background: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  }
  
  nav ul {
    display: flex;
    justify-content: center;
    padding: 0.5rem;
    margin: 0;
    list-style: none;
    flex-wrap: wrap;
  }
  
  nav a {
    text-decoration: none;
    color: #007cf0;
    padding: 1rem;
    font-weight: bold;
    transition: color 0.3s ease;
  }
  
  nav a:hover {
    color: #00dfd8;
  }
  
  section {
    padding: 3rem 2rem;
    max-width: 900px;
    margin: auto;
    background: white;
    border-radius: 20px;
    margin-top: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  }
  
  section h2 {
    color: #007cf0;
    margin-bottom: 1rem;
  }
  
  footer {
    background: #007cf0;
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
    border-top-left-radius: 30px;
    border-top-right-radius: 30px;
  }
  
  /* Responsive */
  @media (max-width: 768px) {
    header h1 {
      font-size: 1.8rem;
    }
  
    nav ul {
      flex-direction: column;
      align-items: center;
    }
  
    nav a {
      padding: 0.75rem;
    }
  
    section {
      padding: 2rem 1rem;
    }
  }