/* 左侧侧边栏样式 - 优化动画效果 */
.js-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  transform: translateX(-100%);
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), visibility 0.4s;
  visibility: hidden;
  will-change: transform;
  -webkit-transform: translateX(-100%);
  -webkit-transition: -webkit-transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), visibility 0.4s;
}

.js-sidebar.is-visible {
  transform: translateX(0);
  visibility: visible;
  -webkit-transform: translateX(0);
}

.js-sidebar--container {
  position: relative;
  z-index: 1;
  width: 320px;
  max-width: 90vw;
  height: 100%;
  background: var(--main-bg-color, #eff2f6);
  display: flex;
  flex-direction: column;
  box-shadow: 2px 0 25px rgba(0,0,0,0.15);
  overflow-y: auto;
  margin-right: auto;
  transform: translateX(-100%);
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform;
  -webkit-transform: translateX(-100%);
  -webkit-transition: -webkit-transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  /* 添加更好的滚动体验 */
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.js-sidebar.is-visible .js-sidebar--container {
  transform: translateX(0);
  -webkit-transform: translateX(0);
}

.js-sidebar--background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0);
  transition: background 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  pointer-events: none;
  will-change: background;
}

.js-sidebar.is-visible .js-sidebar--background {
  background: rgba(0,0,0,0.5);
  pointer-events: auto;
}

/* 侧边栏板块介绍 */
.sidebar-forum-info {
  margin-bottom: 1rem;
}

.sidebar-forum-info .card-header {
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
}

.sidebar-forum-info .card-body {
  padding: 1rem;
}

.sidebar-forum-info .media {
  align-items: center;
}

.sidebar-forum-info .text-small {
  font-size: 0.8rem;
}

/* 移动端适配 */
@media (max-width: 991px) {
  .js-sidebar--container {
    width: 280px;
  }
}

@media (max-width: 576px) {
  .js-sidebar--container {
    width: 100%;
    max-width: 300px;
  }
}

/* 侧边栏用户信息 */
.sidebar--title {
  position: relative;
  text-align: center;
  color: white;
  padding: 1rem;
}

.sidebar-bg {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* 版块列表样式 - 添加微动画 */
.sidebar_forumList .forumlist-bg {
  background-color: var(--aid-color, #f2f3f5);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  transform: scale(1);
}

.sidebar_forumList .forumlist-bg:hover {
  background-color: var(--primary, #409EFF);
  color: white;
  transform: scale(1.02);
}

.sidebar_forumList .nav-item {
  border-radius: 8px;
  overflow: hidden;
}

/* 侧边栏菜单样式 - 添加微动画 */
.sidebar_menu .nav-item {
  margin-bottom: 0.5rem;
}

.sidebar_menu .nav-link {
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: #6c757d;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  transform: scale(1);
}

.sidebar_menu .nav-link:hover,
.sidebar_menu .nav-link.active {
  background-color: var(--primary, #409EFF);
  color: white;
  transform: scale(1.02);
}

.sidebar_menu .nav-link i {
  margin-right: 0.5rem;
  width: 16px;
  text-align: center;
}

/* 性能优化 - 减少重绘 */
.js-sidebar,
.js-sidebar--container,
.js-sidebar--background {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}