/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 600px;
  margin: 50px auto;
  padding: 30px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  color: #2c3e50;
  margin-bottom: 30px;
  font-size: 24px;
}

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

label {
  display: block;
  margin-bottom: 8px;
  font-weight: bold;
  color: #555;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

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

input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: #3498db;
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

button[type="submit"] {
  width: 100%;
  padding: 15px;
  background-color: #3498db;
  color: #fff;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button[type="submit"]:hover {
  background-color: #2980b9;
}

button[type="submit"]:active {
  transform: translateY(1px);
}

#message {
  margin-top: 20px;
  font-size: 16px;
  font-weight: bold;
  padding: 10px;
  border-radius: 5px;
}

.success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.error {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    margin: 20px;
    padding: 20px;
  }
  
  h1 {
    font-size: 20px;
  }
  
  input[type="text"],
  textarea {
    padding: 10px;
  }
  
  button[type="submit"] {
    padding: 12px;
  }
}

@media (max-width: 480px) {
  .container {
    margin: 10px;
    padding: 15px;
  }
  
  h1 {
    font-size: 18px;
  }
}