.contact-form {
  max-width: 700px;
  margin: 0 auto;
  padding: 30px;
  background-color: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
  font-family: 'Segoe UI', Tahoma, sans-serif;
  box-sizing: border-box;
}

/* 表单组通用样式 */
.contact-form .form-group {
  margin-bottom: 25px;
  display: flex;
  flex-direction: column;
}

.contact-form label {
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 15px;
  color: #333;
  line-height: 1.4;
}

.contact-form .required { color: red; margin-left: 4px; }
.contact-form .optional { color: #999; font-size: 13px; margin-left: 6px; }

/* 表单元素通用样式 */
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 12px 15px;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 8px;
  background-color: #f9f9f9;
  transition: border 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
  box-sizing: border-box;
}

/* 下拉框专用调整 - 仅修改必要属性 */
.contact-form select {
  padding: 8px 15px; /* 减小上下内边距确保文字完整 */
  appearance: none; /* 移除箭头 */
}

/* 焦点样式 */
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: #1e88e5;
  background-color: #fff;
  box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.15);
  outline: none;
}

/* 姓名输入框并排 */
.contact-form .form-row {
  display: flex;
  gap: 15px;
  flex-wrap: nowrap;
}

.contact-form .form-row input {
  flex: 1;
  width: 50%;
  margin: 0;
}

/* 文本域 */
.contact-form textarea { resize: vertical; min-height: 120px; }

/* 下拉选项首项样式 */
.contact-form select option:first-child { color: #999; font-size: 16px; }

/* 提交按钮 */
.contact-form button[type="submit"] {
  background-color: #1e88e5;
  color: #fff;
  font-size: 16px;
  padding: 14px 24px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  width: 100%;
  margin-top: 10px;
}

.contact-form button[type="submit"]:hover { background-color: #1565c0; }

/* 移动响应式 */
@media (max-width: 600px) {
  .contact-form { padding: 20px; }
  
  .contact-form .form-row { flex-wrap: wrap; }
  
  .contact-form .form-row input {
    width: 100%;
    margin-bottom: 10px;
  }
  
  .contact-form .form-row input:last-child { margin-bottom: 0; }
  
  /* 手机端下拉框内边距 */
  .contact-form select { padding: 5px 15px !important; }
}