html, body {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

.image-wrapper {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}
.zong11 {
        flex-direction: column;  /* 👈 关键：上下排列 */
  display: flex;
  justify-content: center;
  align-items: center;
}

.image.first {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.image {
  width: 80vw;
  margin: 10px 0;
}

.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: rgba(0,0,0,0.1);
  z-index: 1000;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: rgba(0, 166, 255, 0.315);
  transition: width 0.1s;
}
.fanghui{

  width: 100%;
    display: flex;
  justify-content: space-between;
}

.zuo img {
    margin-top: 20px;
    margin-left: 20px;
    width: 50px;
    opacity: 0.2;
}
.mulu img {
    margin-top: 20px;
    margin-right: 20px;
    width: 50px;
    opacity: 0.2;
     margin-left: auto; /* 👈 关键代码 */
}
.dropdown {
  position: absolute;
  margin-top: 0;   /* 出现在图标下方 */
  right: 0;
  width: 110px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all 0.3s;
padding: 25px 50px 25px 25px;
}
.mulu3{
    text-decoration: none;
    font-size: 30%;
    color: #333;
    line-height: 2;
      display: flex;
  justify-content: center;
}
/* hover 触发 */
.mulu2:hover .dropdown {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.mulu3:hover .mulu4{
    color: #75a2c0; /* 悬停变蓝 */
}