body {
      font-family: Arial, sans-serif;
      background-color: #f8fafc;
      color: #1e293b;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }

    form {
      background: white;
      padding: 2rem;
      border-radius: 12px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
      width: 320px;
    }

    label {
      font-weight: bold;
      display: block;
      margin-top: 1rem;
    }

    input {
      width: 100%;
      padding: 8px;
      margin-top: 0.25rem;
      border: 2px solid #cbd5e1;
      border-radius: 6px;
    }

    input[aria-invalid="true"] {
      border-color: #dc2626;
      background-color: #fee2e2;
    }

    .error {
      color: #dc2626;
      font-size: 0.9em;
      margin-top: 0.25rem;
    }

    button {
      background: #2563eb;
      color: white;
      border: none;
      padding: 10px 16px;
      border-radius: 6px;
      cursor: pointer;
      margin-top: 1rem;
      width: 100%;
      font-size: 1rem;
    }

    button:hover {
      background: #1e40af;
    }