.glass-radio-group {
    --bg: rgba(255, 255, 255, 0.06);
    --text: #999;
  
    display: flex;
    position: relative;
    background: var(--bg);
    border-radius: 1rem;
    backdrop-filter: blur(12px);
    box-shadow:
      inset 1px 1px 4px rgba(255, 255, 255, 0.15),
      inset -1px -1px 6px rgba(0, 0, 0, 0.3),
      0 4px 12px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    width: 100%;
  }
  
  .glass-radio-group input {
    display: none;
  }
  
  .glass-radio-group label {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 0;
    cursor: pointer;
    color: var(--text);
    position: relative;
    z-index: 2;
    transition: color 0.3s ease-in-out;
  }

  .glass-radio-group label svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
  }
  
  .glass-radio-group label:hover {
    color: #ccc;
  }
  
  .glass-radio-group input:checked + label {
    color: #fff;
  }
  
  .glass-glider {
    position: absolute;
    top: 0;
    bottom: 0;
    width: calc(100% / 4);
    border-radius: 1rem;
    z-index: 1;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.35));
    box-shadow:
      0 0 16px rgba(255, 255, 255, 0.15),
      0 0 8px rgba(255, 255, 255, 0.1) inset;
    transition:
      transform 0.5s cubic-bezier(0.37, 1.95, 0.66, 0.56),
      background 0.4s ease-in-out,
      box-shadow 0.4s ease-in-out;
  }
  
  #glass-mail:checked ~ .glass-glider {
    transform: translateX(0%);
  }
  
  #glass-chat:checked ~ .glass-glider {
    transform: translateX(100%);
  }
  
  #glass-link:checked ~ .glass-glider {
    transform: translateX(200%);
  }
  
  #glass-phone:checked ~ .glass-glider {
    transform: translateX(300%);
  }