:root {
    --bg-light: #f5f5f5;
    --text-light: #111;
    --bg-dark: #0a192f;
    --text-dark: #e6f1ff;
  }

  body {
    background-color: var(--bg-dark);
    color: var(--text-dark);
    transition: background-color 0.3s ease, color 0.3s ease;
  }

  body.light-mode {
    background-color: var(--bg-light);
    color: var(--text-light);
  }

  .theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
  }

  .switch input {
    opacity: 0;
    width: 0;
    height: 0;
  }

  .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #9a86fd;
    border-radius: 34px;
    transition: 0.4s;
  }

  .slider::before {
    position: absolute;
    content: '';
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    border-radius: 50%;
    background-color: #fff;
    transition: 0.4s;
  }

  input:checked + .slider {
    background-color: #ffdb70;
  }

  input:checked + .slider::before {
    transform: translateX(26px);
  }