* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.butto a {
  white-space: nowrap; /* 防止换行 */
}
nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.6s;
  padding: 40px 100px;
  z-index: 100;
}
nav.sticky {
  padding: 5px 100px;
  background: #fff;
  height: 63px;
  box-shadow: 0 4px 8px rgba(200, 120, 94, 0.5); /* 粉色阴影 */
}

nav.sticky ul li a {
  color: #000;
}
nav .logoo {
  position: relative;
  height: 53px;
  transition: 0.6s;
}
.shell {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
nav ul li a {
  position: relative;
  margin: 0 15px;
  text-decoration: none;
  color: #ffffff;
  letter-spacing: 2px;
  font-weight: 500;
  transition: 0.6s;
  display: inline-block; /* 确保它们按块级元素布局 */
}

.butto {
  position: relative; /* 确保下拉菜单相对于父元素定位 */
  list-style: none;
  cursor: pointer;
  text-align: center;
  line-height: 40px;
  margin: 10px;
  border-radius: 8px;
}
.butto ul li {
  height: 0;
  transition: 0.3s;
  opacity: 0;
}
.butto:hover li {
  height: 40px;
  opacity: 1;
  border-radius: 8px;
}

.butto ul {
  list-style: none;
}

.butto:hover {
  background-color: rgb(231, 174, 155);
}
.butto li:hover {
  background-color: rgb(212, 145, 123);
}

.jj {
  background: rgb(231, 174, 155);
  position: absolute;
  transition: max-height 0.3s ease-out;
  border-radius: 8px;
}