.header .header-center ul li a{
    font-size: 0.16rem;
    font-weight: 500;
    color: #1f2329;}

/* ===== 历年大赛下拉菜单 ===== */

/* 1. li 设置相对定位，作为下拉定位基准 */
.header .header-center ul li {
  position: relative;}



.header .header-center ul li:has(.sub):hover > a::after {
  transform: rotate(225deg) translateY(-0.01rem);}

/* 3. 下拉面板：默认隐藏，居中于 li 下方 */
.header .header-center ul li .sub {
  position: absolute;
  top: calc(100% + 0.08rem);
  left: 50%;
  min-width: 1.6rem;
  padding: 0.08rem;
  background: #ffffff;
  border-radius: 0.08rem;
  box-shadow: 0 0.08rem 0.24rem rgba(31, 35, 41, 0.15);
  transform: translate(-50%, 0.12rem);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 10;}

/* 4. 下拉里的链接 */
.header .header-center ul li .sub a {
  display: block;
  padding: 0.1rem 0.18rem;
  font-size: 0.14rem;
  font-weight: 400;
  color: #1f2329;
  border-radius: 0.04rem;
  white-space: nowrap;
  transition: all 0.2s;}

.header .header-center ul li .sub a:hover {
  color: #6b5af8;
  background: rgba(107, 90, 248, 0.08);}

/* 5. 鼠标悬停 li 时展开（带动画） */
.header .header-center ul li:hover .sub {
  transform: translate(-50%, 0);
  opacity: 1;
  visibility: visible;}
/* ===== 历年大赛下拉菜单（手机抽屉） ===== */

/* 1. 加减号指示：收起是 +，点击展开后变 - */
.drawer-box .drawer-content ul li > a[href="javascript:void(0)"]::after {
  content: "+";
  display: inline-block;
  margin-left: 0.1rem;
  font-size: 0.18rem;
  font-weight: 400;
  color: #909aaa;
  transition: all 0.2s;}

.drawer-box .drawer-content ul li:focus-within > a[href="javascript:void(0)"]::after {
  content: "-";}

/* 2. 点击展开时：li 从固定高度改为自动撑开 */
.drawer-box .drawer-content ul li:focus-within {
  height: auto;
  line-height: normal;}

.drawer-box .drawer-content ul li:focus-within > a {
  display: inline-block;
  line-height: 0.56rem;}

/* 3. 子菜单默认收起，展开后内联排布，宽度与一级项一致 */
.drawer-box .drawer-content ul li > .subsj {
  display: none;
  padding: 0.04rem 0 0.1rem 0;}

.drawer-box .drawer-content ul li:focus-within > .subsj {
  display: block;}

.drawer-box .drawer-content ul li > .subsj a {
  display: block;
  padding: 0.08rem 0;
  font-size: 0.14rem;
  font-weight: 400;
  color: #909aaa;
  border-radius: 0.04rem;}

.drawer-box .drawer-content ul li > .subsj a:hover,
.drawer-box .drawer-content ul li > .subsj a:active {
  color: #6b5af8;}
.square-bd-qs{
background: url(images/qsy.png);}