body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    margin: 0;
    background: #f5f5f5;
    color: #333;
  }
  
  header {
    background: #0f172a;
    color: white;
    padding: 15px;
    text-align: center;
  }
  
  nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
  }
  
  .container {
    width: 90%;
    max-width: 900px;
    margin: 40px auto;
  }
  
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
  }
  
  .card {
    background: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }
  
  form {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  input, textarea {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  button {
    background: #0f172a;
    color: white;
    padding: 10px;
    border: none;
    cursor: pointer;
  }
  
  button:hover {
    background: #1e293b;
  }
  
  footer {
    text-align: center;
    padding: 20px;
    background: #0f172a;
    color: white;
  }
  
  @media (max-width: 600px) {
    nav {
      display: block;
      margin-top: 10px;
    }
  }