/* ============================================
   Tab Bar - 底部导航
   ============================================ */

.tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--tabbar-height);
  background: var(--tabbar-bg);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: var(--z-tabbar);
  padding-bottom: var(--safe-bottom);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.tabbar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  height: 100%;
  cursor: pointer;
  position: relative;
  transition: color var(--duration-fast);
  color: var(--text-muted);
  padding-top: 4px;
}

.tabbar-item.active {
  color: var(--tabbar-active);
}

.tab-icon {
  width: 24px;
  height: 24px;
  margin-bottom: 2px;
  object-fit: contain;
  transition: transform var(--duration-normal) var(--ease-out);
}

/* 默认 & 选中图标切换 */
.tab-icon-active { display: none; }

.tabbar-item.active .tab-icon-default { display: none; }
.tabbar-item.active .tab-icon-active { display: inline; }

.tabbar-item.active .tab-icon {
  transform: scale(1.08);
}

/* 推荐Tab 中间指示器 */
.tab-indicator {
  position: absolute;
  bottom: -2px;
  width: 20px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  opacity: 0;
  transition: opacity var(--duration-fast);
}

.tabbar-item[data-tab="foryou"].active .tab-indicator {
  opacity: 1;
}

.tab-label {
  font-size: 10px;
  font-weight: var(--font-weight-medium);
  line-height: 1.2;
}