/* Reset default styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
  }
  
  nav {
    background-color: #007bff;
    padding: 15px 20px;
  }
  
  nav a {
    color: white;
    text-decoration: none;
    font-size: 1.2em;
  }
  
  .container {
    max-width: 500px;
    margin: 50px auto;
    padding: 30px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  }
  
  h1 {
    font-size: 2.5em;
    margin-bottom: 30px;
    text-align: center;
    color: #333;
  }
  
  form {
    margin-bottom: 30px;
  }
  
  label {
    font-weight: bold;
    font-size: 1.2em;
    color: #555;
  }
  
  input[type="text"] {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 5px 0 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1.1em;
  }
  
  button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 12px 25px;
    font-size: 1.2em;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  button:hover {
    background-color: #0056b3;
  }
  
  #result {
    margin-top: 30px;
    font-size: 1.3em;
    text-align: center;
    padding: 10px;
    border-radius: 5px;
    color: #007bff;
  }
  
  
  #weight-guide {
    margin-top: 50px;
  }
  
  #weight-guide h3 {
    font-size: 1.8em;
    margin-bottom: 20px;
    color: #333;
    text-align: center;
  }
  
  #weight-guide p {
    font-size: 1.3em;
    margin-bottom: 10px;
    color: #555;
    text-align: center;
  }