:root {
  --obsidian: #1C1C1A;
  --bone: #E8E0D2;
  --gold: #C89550;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--obsidian);
  overflow: hidden;
  overscroll-behavior: none;
}

main { height: 100%; }

canvas#field {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* sound — an object in the environment, not a control bar */
#sound {
  position: fixed;
  right: 18px;
  bottom: 16px;
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  padding: 0;
  background: none;
  border: 0;
  color: var(--bone);
  opacity: 0.22;
  cursor: pointer;
  transition: opacity 1.2s ease;
  -webkit-tap-highlight-color: transparent;
}
#sound:hover, #sound:focus-visible { opacity: 0.55; outline: none; }
#sound .core { opacity: 0; transition: opacity 1.5s ease; }
#sound[aria-pressed="true"] .core { opacity: 1; }
#sound[aria-pressed="true"] { animation: breathe 7s ease-in-out infinite; }
#sound .ring { stroke-dasharray: 40 7; transition: stroke-dasharray 1.5s ease; }
#sound[aria-pressed="true"] .ring { stroke-dasharray: 47 0; }

@keyframes breathe {
  0%, 100% { opacity: 0.22; }
  50% { opacity: 0.42; }
}

@media (prefers-reduced-motion: reduce) {
  #sound[aria-pressed="true"] { animation: none; opacity: 0.35; }
}

/* no-JS: a still doorway */
noscript .still {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: #1C1C1A;
}
noscript .still span {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: clamp(17px, 3.2vw, 30px);
  letter-spacing: 0.42em;
  margin-left: 0.42em;
  color: var(--bone);
  opacity: 0.85;
}