.nav_before::before {
  content: "";
  display: block;
  height: 4px;
  background-color: #0c6ff9;
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  border-radius: 4px;
}

.h5_nav_before::before {
  content: "";
  display: block;
  height: 3px;
  background-color: #0c6ff9;
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  border-radius: 4px;
  width: 60%;
  margin: 0 auto;
}

/* 遮罩层 */
.modal-mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  z-index: 9;
}

/* 弹窗主体 */
.promotion_modal {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 20px 30px 30px;
  border-radius: 5px;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.5);
  transition: all 0.3s ease;
  z-index: 99;
}

.promotion_modal h2 {
  font-size: 18px;
  text-align: center;
  padding-top: 15px;
  font-weight: bold;
  color: #0c6ff9;
  margin-bottom: 20px;
}

.promotion_modal img {
  width: 300px;
}

/* 弹窗显示时的状态 */
.promotion_modal.active {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  display: block;
}

/* 关闭按钮 */
.close-btn {
  position: absolute;
  right: 10px;
  top: 0px;
  cursor: pointer;
  font-size: 30px;
}