/* Letter Glitch Background Effect */
.letter-glitch-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: calc(100% - 70px); /* Reduced by 70px from bottom */
  overflow: hidden;
  background: var(--color-surface-alt);
  z-index: 0;
}

.letter-glitch-grid {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fill, 20px);
  grid-template-rows: repeat(auto-fill, 20px);
  gap: 0;
  padding: 20px;
  pointer-events: none;
}

.glitch-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 11px;
  font-weight: 400;
  color: var(--color-outline-subtle);
  user-select: none;
  /* Remove transition for better performance */
  line-height: 123%;
  letter-spacing: 0.45em; /* 45% as em units */
  text-align: center;
  /* Enable GPU acceleration */
  will-change: contents;
  contain: layout style;
}

.glitch-letter.active {
  color: var(--color-outline);
  font-weight: 500; /* Medium weight for active state */
  /* No animation */
}

/* Pattern debug borders */
/* .letter-pattern-grid { */
/*   border: 1px solid red; */
/*   box-sizing: border-box; */
/* } */

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .glitch-letter,
  .glitch-letter.active {
    animation: none;
    transition: none;
  }
}

/* Mobile optimization */
@media (max-width: 768px) {
  .letter-glitch-grid {
    grid-template-columns: repeat(auto-fill, 18px);
    grid-template-rows: repeat(auto-fill, 18px);
  }

  .glitch-letter {
    font-size: 9px;
    letter-spacing: 0.35em; /* Slightly less spacing on mobile */
  }
}