* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
  }
  
  body {
    background-color: #f7f7f7;
    color: #333;
  }
  
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #004080;
    padding: 1rem 2rem;
    color: white;
  }
  
  .nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
  }
  
  .nav-links li a {
    color: white;
    text-decoration: none;
  }
  
  .hero {
    text-align: center;
    padding: 5rem 2rem;
    background: linear-gradient(to right, #0066cc, #004080);
    color: white;
  }
  
  .hero .btn {
    background-color: white;
    color: #004080;
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 1rem;
    display: inline-block;
  }
  
  .calculator {
    padding: 3rem 2rem;
    background-color: #fff;
    max-width: 600px;
    margin: auto;
    text-align: center;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
  }
  
  .calc-form input {
    padding: 0.5rem;
    margin: 0.5rem;
    width: 80%;
    max-width: 300px;
  }
  
  .calc-form button {
    margin-top: 1rem;
    padding: 0.7rem 1.5rem;
    background-color: #004080;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  footer {
    text-align: center;
    padding: 1rem;
    background-color: #004080;
    color: white;
    margin-top: 2rem;
  }