/* LED strip sequential lighting */
    @keyframes led-power-up {
      0% {
        opacity: 0.1;
      }

      20% {
        opacity: 1;
      }

      100% {
        opacity: 1;
      }
    }

    /* Bright flash before disappearing */
    @keyframes led-flash {
      0% {
        opacity: 1;
      }

      50% {
        opacity: 0.8;
      }

      100% {
        opacity: 0;
      }
    }

    /* Loader fade-out */
    .fade-out {
      animation: fadeOut 0.3s ease-out forwards;
    }

    @keyframes fadeOut {
      to {
        opacity: 0;
        visibility: hidden;
      }
    }