:root {
  --night: #07090c;
  --ink: #dbe4e8;
  --dim: #7d8b92;
  --line: #8ca6b0;
  --hot: #70e1d1;
  --altered: #f1b66e;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: "Avenir Next", "Helvetica Neue", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html,
body {
  margin: 0;
  min-height: 100%;
  overflow: hidden;
  background: var(--night);
  color: var(--ink);
}

body { font-family: var(--sans); }

button,
a { font: inherit; }

button { -webkit-tap-highlight-color: transparent; }

.house-nav {
  position: fixed;
  top: max(.8rem, env(safe-area-inset-top));
  left: 50%;
  z-index: 30;
  display: flex;
  gap: .53rem;
  align-items: center;
  transform: translateX(-50%);
  padding: .55rem .72rem;
  border: 1px solid rgba(219, 228, 232, .12);
  border-radius: 999px;
  color: rgba(219, 228, 232, .68);
  background: rgba(7, 9, 12, .46);
  backdrop-filter: blur(12px);
  font-size: clamp(.58rem, .95vw, .7rem);
  letter-spacing: .07em;
  white-space: nowrap;
}

.house-nav a {
  color: rgba(219, 228, 232, .48);
  text-decoration: none;
  transition: color .5s ease;
}

.house-nav a:hover,
.house-nav a:focus-visible { color: var(--ink); }

.house-nav [aria-current="page"] { color: var(--hot); }

#room {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 46%, rgba(112, 225, 209, .05), transparent 46%),
    linear-gradient(172deg, #090c11, #06080b 62%, #080a0d);
}

.threshold,
.mechanism {
  position: absolute;
  inset: 0;
  min-height: 100svh;
  transition: opacity 1.5s ease, visibility 1.5s;
}

.threshold {
  display: grid;
  align-content: center;
  justify-items: start;
  padding: clamp(1.4rem, 7vw, 7rem);
}

.eyebrow,
.rule {
  margin: 0;
  color: var(--dim);
  font-family: var(--mono);
  font-size: clamp(.62rem, 1.05vw, .76rem);
  line-height: 1.7;
  letter-spacing: .12em;
  text-transform: lowercase;
}

h1 {
  margin: 1.4rem 0 1.5rem;
  max-width: 13ch;
  font: 300 clamp(2.9rem, 7.6vw, 6.6rem)/.92 var(--sans);
  letter-spacing: -.04em;
}

#enter,
#forget,
#sound {
  padding: .7rem 0;
  border: 0;
  border-bottom: 1px solid rgba(219, 228, 232, .26);
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  transition: color .6s ease, border-color .6s ease;
}

#enter { margin-top: 1.9rem; }

#enter:hover,
#enter:focus-visible,
#sound:hover,
#sound:focus-visible,
#forget:hover,
#forget:focus-visible {
  color: var(--hot);
  border-color: var(--hot);
}

.mechanism {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

[data-state="running"] .threshold {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

[data-state="running"] .mechanism {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

#machine {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
  cursor: crosshair;
}

#machine:focus-visible { box-shadow: inset 0 0 0 1px rgba(112, 225, 209, .3); }

.readout {
  position: absolute;
  top: max(4.6rem, calc(env(safe-area-inset-top) + 4rem));
  left: max(1.5rem, env(safe-area-inset-left));
  z-index: 4;
  margin: 0;
  display: grid;
  gap: .62rem;
  font-family: var(--mono);
  font-size: clamp(.6rem, .92vw, .7rem);
  letter-spacing: .07em;
  pointer-events: none;
}

.readout div {
  display: grid;
  grid-template-columns: 4.6rem auto;
  align-items: baseline;
}

.readout dt {
  color: rgba(125, 139, 146, .78);
  text-transform: lowercase;
}

.readout dd {
  margin: 0;
  color: rgba(219, 228, 232, .84);
  transition: color 1s ease;
}

[data-seed="altered"] #readout-state,
[data-seed="altered"] #readout-seed { color: var(--altered); }

.instruction {
  position: absolute;
  left: 50%;
  bottom: max(4.7rem, calc(env(safe-area-inset-bottom) + 4.1rem));
  z-index: 4;
  display: grid;
  gap: .3rem;
  margin: 0;
  transform: translateX(-50%);
  color: rgba(125, 139, 146, .8);
  font-family: var(--mono);
  font-size: clamp(.6rem, .95vw, .72rem);
  letter-spacing: .11em;
  text-align: center;
  pointer-events: none;
}

.instruction span { transition: opacity 1.8s ease; }

[data-instruction="altered"] .instruction span:first-child { opacity: 0; }
[data-instruction="gone"] .instruction span { opacity: 0; }

.controls {
  position: absolute;
  right: max(1.5rem, env(safe-area-inset-right));
  bottom: max(1.3rem, env(safe-area-inset-bottom));
  z-index: 5;
  display: flex;
  gap: 1.4rem;
  align-items: baseline;
}

.return {
  color: rgba(219, 228, 232, .5);
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-decoration: none;
  transition: color .6s ease;
}

.return:hover,
.return:focus-visible { color: var(--ink); }

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

@media (max-width: 650px) {
  .house-nav a:not([href$="#rooms"]) { display: none; }

  .threshold { padding: 1.4rem; align-content: end; padding-bottom: 22vh; }

  h1 { font-size: clamp(2.6rem, 12vw, 4.4rem); }

  .readout {
    top: auto;
    bottom: max(7.6rem, calc(env(safe-area-inset-bottom) + 7rem));
    left: 50%;
    gap: .42rem;
    transform: translateX(-50%);
    font-size: .62rem;
  }

  .readout div { grid-template-columns: 4.2rem auto; }

  .instruction { display: none; }

  .controls {
    left: 50%;
    right: auto;
    gap: 1.1rem;
    transform: translateX(-50%);
    font-size: .68rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * ,
  *::before,
  *::after { transition-duration: .01ms !important; }
}