/* One faint text fragment, not a full-screen brightness change. */
.text-echo {
  position: fixed;
  inset: var(--echo-y, 44vh) auto auto var(--echo-x, 8vw);
  z-index: 5;
  max-width: calc(100vw - var(--echo-x, 8vw) - 20px);
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  color: #c4d787;
  font: 500 clamp(13px, 1.8vw, 26px)/1.35 var(--mono);
  letter-spacing: .17em;
  white-space: nowrap;
  opacity: 0;
  contain: layout style paint;
}
.text-echo.is-chirping {
  animation: echo-chirp var(--echo-duration, 150ms) steps(1, end) both;
}
.text-echo::before,
.text-echo::after {
  content: attr(data-echo);
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.text-echo::before {
  color: #c2a5d2;
  transform: translateX(-3px);
  clip-path: inset(24% 0 49% 0);
}
.text-echo::after {
  color: #dbe6b8;
  transform: translateX(4px);
  clip-path: inset(65% 0 18% 0);
}
@keyframes echo-chirp {
  0% { opacity: 0; transform: translateX(0); }
  12% { opacity: var(--echo-opacity, .13); transform: translateX(-2px) skewX(-5deg); }
  43% { opacity: .035; transform: translateX(2px); }
  62% { opacity: var(--echo-opacity, .13); transform: translateX(0); }
  82%, 100% { opacity: 0; transform: translateX(0); }
}
.echo-controls {
  width: 100%; display: flex; justify-content: flex-end; gap: 20px;
  border-top: 1px solid var(--line); margin-top: 5px; padding-top: 8px;
}
.echo-controls button {
  min-height: 44px; padding: 8px 0; font: 9px var(--mono);
  letter-spacing: .6px; text-transform: uppercase;
}
.echo-controls button[aria-pressed="true"] { color: var(--green); }
.echo-controls button:disabled { opacity: .55; cursor: default; }
@media (max-width: 650px) {
  .echo-controls { justify-content: space-between; }
  .text-echo { letter-spacing: .1em; }
}
@media (prefers-reduced-motion: reduce) {
  .text-echo { display: none !important; animation: none !important; }
}
body.animations-skipped .text-echo { display: none !important; }