/* 侧边栏样式 */

.sidebar {
  width: 280px;
  background: var(--sidebar);
  color: white;
  padding: 20px 0;
  /* 允许子菜单在水平方向浮出而不被裁剪 */
  overflow: visible;
  transition: width 0.3s, left 0.3s;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 64px;
  left: 0;
  height: calc(100vh - 64px);
  z-index: 10;
}

.menu-item {
  margin-bottom: 4px;
}

.sidebar-item {
  display: block;
  padding: 12px 20px;
  color: white;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all 0.2s;
  cursor: pointer;
}

.sidebar-item:hover,
.sidebar-item.active {
  background: rgba(255, 255, 255, 0.1);
  border-left-color: #60a5fa;
}

.sidebar-item .icon {
  display: inline-block;
  width: 20px;
  margin-right: 12px;
  text-align: center;
}

.sidebar-item .arrow {
  float: right;
  transition: transform 0.2s;
}

.sidebar-item.expanded .arrow {
  transform: rotate(90deg);
}

/* 二级菜单样式 - 向右展开 */
.menu-item {
  position: relative;
}

.submenu {
  position: absolute;
  left: 100%;
  top: 0;
  width: 250px;
  background: var(--sidebar);
  border-radius: 6px;
  box-shadow: 4px 0 16px rgba(0, 0, 0, 0.25);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-8px);
  transition: opacity .2s, transform .2s, visibility .2s;
  z-index: 1000;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 悬浮时向右展开 */
.menu-item:hover > .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.menu-item:hover .sidebar-item .arrow {
  transform: rotate(90deg);
}

.submenu-item {
  display: block;
  padding: 10px 16px;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: 14px;
  transition: background-color .2s, color .2s;
}

.submenu-item:hover,
.submenu-item.active {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}


/* 侧边栏折叠状态 */
.sidebar.collapsed {
  width: 60px;
}

.sidebar.collapsed .sidebar-item {
  padding: 12px 8px;
  text-align: center;
  border-left: none;
}

.sidebar.collapsed .sidebar-item .icon {
  margin-right: 0;
}

.sidebar.collapsed .sidebar-item span:not(.icon) {
  display: none;
}

.sidebar.collapsed .sidebar-item .arrow {
  display: none;
}

.sidebar.collapsed .submenu {
  left: 60px;
  width: 220px;
}

.sidebar.collapsed .menu-item:hover .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}