:root {
    --bg-color-light: #f4f4f4;
    --text-color-light: #1a1a1a;
    --bg-color-dark: #1a1a1a;
    --text-color-dark: #f4f4f4;
  }
  
  body {
    margin: 0;
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    transition: background 0.5s, color 0.5s;
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
  }
  
  #toggleSwitch {
    -webkit-appearance: none;
    appearance: none;
    width: 60px;
    height: 30px;
    background: #000;
    border-radius: 30px;
    position: relative;
    cursor: pointer;
    outline: none;
    transition: background 0.3s;
  }
  
  #toggleSwitch::before {
    content: "";
    position: absolute;
    width: 24px;
    height: 24px;
    background: #fff;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform 0.3s;
  }
  
  #toggleSwitch:checked {
    background: #555;
  }
  
  #toggleSwitch:checked::before {
    transform: translateX(30px);
  }
  
  body.dark-mode {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
  }