body {
      margin: 0;
      font-family: sans-serif;
      background-color: #fff;
      color: #111;
      line-height: 1.6;
    }
    header, section, footer {
      padding: 4rem 2rem;
      max-width: 800px;
      margin: auto;
    }
    header {
      text-align: center;
    }
    header h1 {
      font-size: 2.5rem;
      margin-bottom: 1rem;
    }
    nav {
      text-align: center;
      margin-bottom: 2rem;
    }
    nav a {
      margin: 0 1rem;
      text-decoration: none;
      color: #555;
    }
    nav a:hover {
      color: #000;
    }
    .portfolio-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 1rem;
    }
    .portfolio-item {
      background: #f5f5f5;
      height: 150px;
    }
    footer {
      font-size: 0.9rem;
      text-align: center;
      color: #999;
    }
    form input, form textarea {
      width: 100%;
      padding: 0.5rem;
      margin-bottom: 1rem;
      border: 1px solid #ccc;
      border-radius: 4px;
    }
    form button {
      background: #000;
      color: #fff;
      border: none;
      padding: 0.75rem 1.5rem;
      cursor: pointer;
    }