.firefly {
    position: fixed;
    left: 50%;
    top: 50%;
    width: 0.4vw;
    height: 0.4vw;
    margin: -0.2vw 0 0 9.8vw;
    animation: ease 200s alternate infinite;
    pointer-events: none;
  }

  .firefly::before,
  .firefly::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    transform-origin: -10vw;
  }

  .firefly::before {
    background: black;
    opacity: 0.4;
    animation: drift ease alternate infinite;
  }

  /* Yellow glow default */
  .firefly::after {
    background: white;
    opacity: 0;
    box-shadow: 0 0 0vw 0vw #ffbc78;
    animation: drift ease alternate infinite, flash ease infinite;
  }

  /* Blue glow variant */
  .firefly.blue::after {
    box-shadow: 0 0 0vw 0vw #00bfff; /* bright blue */
    animation: drift ease alternate infinite, flashBlue ease infinite;
  }

  @keyframes drift {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  @keyframes flash {
    0%, 30%, 100% {
      opacity: 0;
      box-shadow: 0 0 0vw 0vw #ffbc78;
    }
    5% {
      opacity: 1;
      box-shadow: 0 0 2vw 0.4vw #ffbc78;
    }
  }

  @keyframes flashBlue {
    0%, 30%, 100% {
      opacity: 0;
      box-shadow: 0 0 0vw 0vw #00bfff;
    }
    5% {
      opacity: 1;
      box-shadow: 0 0 2vw 0.4vw #00bfff;
    }
  }