.download {
  position: relative;
  display: inline-block;
}

/* 按钮 */
.download-btn {
  background-color: #cef0d7;
  color: rgb(37, 152, 79);
  padding: 10px 15px;
  border-radius: 45px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

.download-btn img {
    height: 20px;
    width: 20px;
}

/* 箭头 */
.arrow {
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid #1f7a1f;
  transition: transform 0.25s ease;
}

.arrow.open {
  transform: rotate(180deg);
}

/* 下拉菜单（关键动画） */
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  width: 220px;
  background: #f3f3f3;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.12);
  overflow: hidden;

  /* 动画初始状态 */
  opacity: 0;
  transform: scale(0.95);
  transform-origin: top left;
  pointer-events: none;

  transition: 
    opacity 0.2s ease,
    transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* 菜单项 */
.dropdown .item {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.dropdown .item img {
  width: 24px;
  height: 24px;
}

.item:not(:last-child) {
  border-bottom: 1px solid #ddd;
}

.item:hover {
  background: #eaeaea;
}

/* hover 触发 */
.download:hover .dropdown {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

/* 箭头旋转 */
.download:hover .arrow {
  transform: rotate(180deg);
}