.zextra-shiny-text {
  font-size: 60px;
  font-weight: bold;

  /* ✅ dynamic base color */
  color: var(--text-color, rgba(255,255,255,0.5));
  -webkit-text-fill-color: var(--text-color, rgba(255,255,255,0.5));

  background-image: linear-gradient(
    90deg,
    transparent,
    var(--shine-color, rgba(255,255,255,0.9)),
    transparent
  );

  background-repeat: no-repeat;
  background-size: var(--shiny-width) 100%;
  background-position: 0 0;

  background-clip: text;
  -webkit-background-clip: text;

  animation: shiny 2s linear infinite;
}

@keyframes shiny {
    0% {
      background-position: calc(-1 * var(--shiny-width)) 0;
    }
    100% {
      background-position: calc(100% + var(--shiny-width)) 0;
    }
}