.mobile-mainnav-bar {
  display: none;
}
@media (max-width: 768px) {
  .mobile-mainnav-bar {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 9998;
    background: #fff;
    border-top: 1px solid #eee;
    box-shadow: 0 -2px 12px rgba(0,0,0,0.07);
    height: 56px;
  }
  .mobile-mainnav-bar .mainnav-btn {
    flex: 1 1 0;
    text-align: center;
    color: #1976d2;
    text-decoration: none;
    font-size: 0.9em;
    font-weight: bold;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: background 0.15s, color 0.15s;
  }
  .mobile-mainnav-bar .mainnav-btn .icon {
    font-size: 1.2em;
    margin-bottom: 2px;
    display: block;
    line-height: 1;
    position: relative;
  }
  
  /* 購物車圖示容器 */
  .mobile-mainnav-bar .cart-icon-container {
    position: relative;
    display: inline-block;
  }
  
  /* 手機版購物車數量徽章 */
  .mobile-mainnav-bar .mobile-cart-count {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #ff4444;
    color: white;
    border-radius: 50%;
    min-width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: bold;
    line-height: 1;
    animation: cartBounce 0.3s ease;
  }
  
  @keyframes cartBounce {
    0% {
      transform: scale(0.8);
    }
    50% {
      transform: scale(1.2);
    }
    100% {
      transform: scale(1);
    }
  }
  .mobile-mainnav-bar .mainnav-btn.active,
  .mobile-mainnav-bar .mainnav-btn:active {
    background: #f0f4fa;
    color: #e60012;
  }
}