:root {
  --night: #0c0b0a;
  --ink: #e6e0d6;
  --dim: #8d857a;
  --faded: #b8ad9c;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: "Avenir Next", "Helvetica Neue", system-ui, sans-serif;
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, 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(230, 224, 214, .12);
  border-radius: 999px;
  color: rgba(230, 224, 214, .66);
  background: rgba(12, 11, 10, .46);
  backdrop-filter: blur(12px);
  font-size: clamp(.56rem, .92vw, .68rem);
  letter-spacing: .07em;
  white-space: nowrap;
}

.house-nav a {
  color: rgba(230, 224, 214, .46);
  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(--faded); }

#room {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 32% 26%, rgba(184, 173, 156, .05), transparent 44%),
    radial-gradient(circle at 74% 78%, rgba(140, 122, 96, .04), transparent 42%),
    linear-gradient(163deg, #100e0c, #0a0908 58%, #0d0b0a);
}

#field {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
}

.grain {
  position: fixed;
  inset: -45%;
  z-index: 6;
  pointer-events: none;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.86' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E");
  animation: grain .4s steps(2) infinite;
}

@keyframes grain {
  0% { transform: translate(-1%, 2%); }
  50% { transform: translate(2%, -1%); }
  100% { transform: translate(1%, 1%); }
}

.threshold,
.reading,
.empty {
  position: absolute;
  inset: 0;
  min-height: 100svh;
  z-index: 4;
  transition: opacity 1.8s ease, visibility 1.8s;
}

.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, .74rem);
  line-height: 1.75;
  letter-spacing: .11em;
}

h1 {
  margin: 1.4rem 0 1.5rem;
  font: 300 clamp(3rem, 8vw, 6.8rem)/.92 var(--serif);
  letter-spacing: -.02em;
}

#enter,
#sound {
  padding: .7rem 0;
  border: 0;
  border-bottom: 1px solid rgba(230, 224, 214, .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 {
  color: var(--faded);
  border-color: var(--faded);
}

.reading,
.empty {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

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

[data-state="reading"] .reading,
[data-state="empty"] .empty {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.empty {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 2.6rem;
  padding: clamp(1.4rem, 7vw, 7rem);
  text-align: center;
}

.closing {
  margin: 0;
  max-width: 24ch;
  color: var(--faded);
  font: 300 clamp(1.3rem, 3.2vw, 2.2rem)/1.5 var(--serif);
}

.ending-actions a,
.return {
  color: rgba(230, 224, 214, .5);
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-decoration: none;
  transition: color .6s ease;
}

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

.instruction {
  position: absolute;
  left: 50%;
  bottom: max(4.6rem, calc(env(safe-area-inset-bottom) + 4rem));
  display: grid;
  gap: .32rem;
  margin: 0;
  transform: translateX(-50%);
  color: rgba(141, 133, 122, .8);
  font-family: var(--mono);
  font-size: clamp(.58rem, .95vw, .7rem);
  letter-spacing: .11em;
  text-align: center;
  pointer-events: none;
  transition: opacity 2.6s ease;
}

[data-instruction="gone"] .instruction { opacity: 0; }

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

.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 { align-content: end; padding: 1.4rem; padding-bottom: 20vh; }

  h1 { font-size: clamp(2.7rem, 13vw, 4.6rem); }

  .instruction { display: none; }

  .controls {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .grain { animation: none; }

  *,
  *::before,
  *::after { transition-duration: .01ms !important; }
}