.bottom-nav {
    position: fixed;
    bottom: 0px;
    left: 0;
    right: 0;
    background: rgba(60, 60, 70, 0.4);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 5px;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-item {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    color: #ffffff;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    text-decoration: none;
    border-radius: 5px;
    background: transparent;
    border: none;
    position: relative;
    overflow: hidden;
  }

  .nav-item span {
    position: relative;
    z-index: 2;
  }

  .nav-item svg {
    width: 24px;
    height: 24px;
    display: none;
    margin-right: 3px;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
  }
  
  .nav-item[data-nav-type="vip"] svg {
    width: 28px;
    height: 28px;
    margin-right: 4px;
  }

  .nav-item.active {
    flex: 1.4;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #fff;
    /*
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.1);
    */
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-item.active svg {
    display: block;
    fill: url(#purple-gradient); 
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
  }
  
  .nav-item.active svg path {
    fill: url(#purple-gradient);
  }

  @keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
  }