.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100rpx;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
  box-shadow: 0 -4rpx 20rpx rgba(102, 126, 234, 0.3);
  z-index: 9999;
}

.tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-item.active {
  transform: translateY(-10rpx);
}

/* Emoji图标 */
.tab-emoji {
  font-size: 44rpx;
  line-height: 1;
  margin-bottom: 4rpx;
  transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  filter: grayscale(100%) brightness(1.2) opacity(0.5);
}

.tab-item.active .tab-emoji {
  filter: grayscale(0%) brightness(1.3) opacity(1) drop-shadow(0 0 12rpx rgba(255, 255, 255, 0.8));
  transform: scale(1.25);
}

/* 弹跳动画 */
.emoji-bounce {
  animation: emoji-bounce 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes emoji-bounce {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.35);
  }
}

/* 文字标签 */
.tab-text {
  font-size: 20rpx;
  line-height: 1;
  font-weight: 500;
  transition: all 0.3s ease;
  opacity: 0.7;
  color: rgba(255, 255, 255, 0.7);
}

.tab-item.active .tab-text {
  opacity: 1;
  font-weight: 700;
  color: #FFFFFF;
  text-shadow: 0 0 15rpx rgba(255, 255, 255, 0.8),
               0 2rpx 8rpx rgba(0, 0, 0, 0.3);
  transform: scale(1.05);
}

/* 选中指示器 */
.tab-indicator {
  position: absolute;
  bottom: 0;
  width: 50rpx;
  height: 8rpx;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.6));
  border-radius: 4rpx 4rpx 0 0;
  box-shadow: 0 0 20rpx rgba(255, 255, 255, 0.8),
              0 -2rpx 10rpx rgba(255, 255, 255, 0.5);
  animation: indicator-slide 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes indicator-slide {
  from {
    width: 0;
    opacity: 0;
    transform: scaleX(0);
  }
  to {
    width: 50rpx;
    opacity: 1;
    transform: scaleX(1);
  }
}

/* 点击波纹效果 */
.tab-item::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.tab-item:active::before {
  width: 100rpx;
  height: 100rpx;
}