body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f3f4f6;
    margin: 0;
    padding: 0;
    color: #111827;
  }
  
  header {
    background: #ef4444;
    color: white;
    padding: 1rem 2rem;
  }
  
  header h1 {
    margin: 0;
  }
  
  main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 1.5rem;
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
  }
  
  a {
    color: #ef4444;
    text-decoration: none;
  }
  
  a.button,
  button {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 999px;
    border: none;
    background: #ef4444;
    color: white;
    font-weight: 600;
    cursor: pointer;
    margin-top: 0.5rem;
  }
  
  a.button:hover,
  button:hover {
    background: #b91c1c;
  }
  
  form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
  }
  
  input[type="text"],
  textarea {
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    border: 1px solid #d1d5db;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
  }
  
  textarea {
    min-height: 150px;
    resize: vertical;
  }
  
  label {
    font-weight: 600;
  }
  
  .error {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    background: #fee2e2;
    color: #b91c1c;
    margin-top: 0.5rem;
  }
  
  .info {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    background: #eff6ff;
    color: #1d4ed8;
    margin-top: 0.5rem;
  }
  
  .code-box {
    font-family: monospace;
    font-size: 1.2rem;
    background: #111827;
    color: #f9fafb;
    display: inline-block;
    padding: 0.4rem 0.8rem;
    border-radius: 0.5rem;
    letter-spacing: 0.2em;
  }
  
  ul {
    padding-left: 1.2rem;
  }
  
  footer {
    text-align: center;
    margin-bottom: 1rem;
    color: #6b7280;
    font-size: 0.875rem;
  }