* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.container {
  background: #fff;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  width: 100%;
  max-width: 480px;
}

h1 {
  margin-bottom: 24px;
  color: #333;
  font-size: 1.5rem;
  text-align: center;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 6px;
  color: #555;
  font-size: 0.9rem;
  font-weight: 500;
}

input, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

input:focus, textarea:focus {
  outline: none;
  border-color: #007bff;
  box-shadow: 0 0 0 3px rgba(0,123,255,0.15);
}

input.error, textarea.error {
  border-color: #dc3545;
}

.error {
  display: block;
  color: #dc3545;
  font-size: 0.8rem;
  margin-top: 4px;
  min-height: 1.2em;
}

textarea {
  resize: vertical;
  min-height: 100px;
}

button {
  width: 100%;
  padding: 12px;
  background: #007bff;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.15s;
}

button:hover {
  background: #0056b3;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,123,255,0.3);
}

button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.message {
  margin-top: 16px;
  padding: 12px;
  border-radius: 4px;
  text-align: center;
  display: none;
}

.message.success {
  display: block;
  background: #d4edda;
  color: #155724;
}

.message.error {
  display: block;
  background: #f8d7da;
  color: #721c24;
}

@media (max-width: 480px) {
  .container {
    padding: 20px;
  }

  h1 {
    font-size: 1.3rem;
  }
}