/* 基础样式 */
body {
  font-family: 'Arial', sans-serif;
  background-color: #f4f6f9;
  color: #333;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

/* 容器 */
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 400px;
  padding: 15px;
}

/* 卡片样式 */
.form-card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  padding: 30px 20px;
  width: 100%;
  max-width: 400px;
  text-align: center;
}

/* 标题样式 */
.form-card h2 {
  margin: 0 0 20px;
  font-size: 1.8rem;
  color: #444;
}

/* 表单组 */
.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-group label {
  display: block;
  font-weight: bold;
  margin-bottom: 8px;
}

.form-group input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  box-sizing: border-box;
}

.form-group input:focus {
  outline: none;
  border-color: #007bff;
  box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

/* 下拉选择框样式 */
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    background-color: #fff;
    cursor: pointer;
    box-sizing: border-box;
}

.form-group select:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

/* 按钮 */
.btn {
  display: inline-block;
  width: 100%;
  padding: 12px;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s;
}

.btn:hover {
  background-color: #0056b3;
}

/* 消息提示窗样式 */
.message-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /* 水平和垂直居中 */
  z-index: 1000;
  visibility: hidden;
  /* 初始不可见 */
  opacity: 0;
  padding: 10px 20px;
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 5px;
  font-size: 16px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  transition: opacity 0.5s ease, visibility 0.5s ease;
  /* 添加过渡效果 */
}

.message-box.show {
  visibility: visible;
  /* 显示 */
  opacity: 1;
}

.message-box.hide {
  opacity: 0;
  transform: translateX(100%);
}

/* 类型样式 */
.message-box.success {
  background-color: #28a745;
}

.message-box.error {
  background-color: #dc3545;
}

.message-box.warning {
  background-color: #ffc107;
}

.message-box.info {
  background-color: #007bff;
}

/* 页面切换文字 */
.switch-page {
  margin-top: 20px;
  font-size: 0.9rem;
}

.switch-page a {
  color: #007bff;
  text-decoration: none;
}

.switch-page a:hover {
  text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 600px) {
  .form-card {
      padding: 20px;
  }
}