:root {
  --night: #0b1117;
  --deep: #111d28;
  --ink: #dfe7ea;
  --dim: #81909a;
  --pearl: #c9d5d7;
  --copper: #b68e72;
  --blue: #708ca1;
  --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: .57rem;
  align-items: center;
  transform: translateX(-50%);
  padding: .55rem .75rem;
  border: 1px solid rgba(223, 231, 234, .13);
  border-radius: 999px;
  color: rgba(223, 231, 234, .72);
  background: rgba(9, 16, 23, .42);
  backdrop-filter: blur(14px);
  font-size: clamp(.56rem, .95vw, .69rem);
  letter-spacing: .065em;
  white-space: nowrap;
  opacity: .62;
  transition: opacity 1.2s ease, border-color 1.2s ease, background 1.2s ease;
}

.house-nav:hover,
.house-nav:focus-within {
  opacity: 1;
  border-color: rgba(201, 213, 215, .34);
}

.house-nav a {
  color: rgba(223, 231, 234, .5);
  text-decoration: none;
}

.house-nav a:hover,
.house-nav a:focus-visible,
.house-nav [aria-current="page"] { color: var(--ink); }

#room {
  position: relative;
  min-height: 100svh;
  isolation: isolate;
  background: var(--night);
}

.threshold,
.ending {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: grid;
  align-content: center;
  justify-items: start;
  padding: clamp(1.6rem, 11vw, 11rem);
  padding-top: max(clamp(5rem, 12vh, 8rem), env(safe-area-inset-top));
  background:
    radial-gradient(ellipse at 76% 38%, rgba(112, 140, 161, .2), transparent 34%),
    radial-gradient(ellipse at 24% 67%, rgba(182, 142, 114, .11), transparent 37%),
    linear-gradient(145deg, #111b24, #091017 61%, #15171a);
  transition: opacity 3.4s ease, visibility 3.4s;
}

.threshold::before,
.ending::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .12;
  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='.62' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.42'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

h1,
.ending p {
  position: relative;
  margin: 0;
  max-width: 11ch;
  font: 300 clamp(3.7rem, 9.2vw, 8.8rem)/.88 var(--sans);
  letter-spacing: -.055em;
  text-wrap: balance;
}

.ending p {
  font-family: var(--serif);
  font-size: clamp(3.2rem, 7.8vw, 7.2rem);
  font-style: italic;
  line-height: .92;
  letter-spacing: -.045em;
}

.listening-rule {
  position: relative;
  margin: 1.55rem 0 0;
  color: rgba(223, 231, 234, .58);
  font: 400 clamp(.78rem, 1.25vw, .98rem)/1.62 var(--sans);
  letter-spacing: .045em;
}

#enter,
#again,
.return {
  position: relative;
  margin-top: 1.55rem;
  padding: .72rem 0;
  border: 0;
  border-bottom: 1px solid rgba(223, 231, 234, .34);
  color: rgba(223, 231, 234, .82);
  background: transparent;
  cursor: pointer;
  text-decoration: none;
  transition: color 1s ease, border-color 1s ease, letter-spacing 1.4s ease, opacity 2s ease;
}

#enter:hover,
#again:hover,
.return:hover,
#enter:focus-visible,
#again:focus-visible,
.return:focus-visible {
  color: var(--pearl);
  border-color: var(--pearl);
  letter-spacing: .025em;
}

#enter:disabled,
#again:disabled {
  cursor: wait;
  opacity: .58;
}

.return { margin-top: .18rem; }

.performance {
  position: absolute;
  inset: 0;
  visibility: hidden;
  opacity: 0;
  background: var(--night);
  transition: opacity 3.4s ease, visibility 3.4s;
}

#listening-field {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  cursor: none;
  touch-action: none;
}

#listening-field:focus-visible {
  box-shadow: inset 0 0 0 1px rgba(201, 213, 215, .4);
}

.ending {
  visibility: hidden;
  opacity: 0;
  color: rgba(223, 231, 234, .94);
  background:
    linear-gradient(90deg, rgba(8, 15, 21, .78), rgba(8, 15, 21, .14) 68%, transparent),
    radial-gradient(ellipse at 77% 44%, rgba(112, 140, 161, .16), transparent 42%);
  pointer-events: none;
}

.ending #again,
.ending .return {
  opacity: 0;
  color: rgba(223, 231, 234, .72);
}

.ending .return { transition-delay: .6s; }

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

[data-state="running"] .performance,
[data-state="ending"] .performance {
  visibility: visible;
  opacity: 1;
}

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

[data-state="ending"] .ending #again,
[data-state="ending"] .ending .return { opacity: 1; }

body[data-room-state="running"] .house-nav,
body[data-room-state="ending"] .house-nav {
  color: rgba(223, 231, 234, .68);
  background: rgba(7, 13, 19, .38);
}

body[data-room-state="running"] .house-nav a,
body[data-room-state="ending"] .house-nav a { color: rgba(223, 231, 234, .43); }

.sound-fallback {
  position: absolute;
  left: 50%;
  bottom: max(2rem, env(safe-area-inset-bottom));
  z-index: 8;
  transform: translateX(-50%);
  padding: .7rem .95rem;
  border: 1px solid rgba(223, 231, 234, .42);
  color: rgba(223, 231, 234, .9);
  background: rgba(8, 15, 21, .72);
  backdrop-filter: blur(12px);
}

.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) {
  .threshold,
  .ending {
    padding: 1.4rem;
    padding-top: max(5.2rem, env(safe-area-inset-top));
  }

  h1 { font-size: clamp(3.6rem, 17vw, 6rem); }
  .ending p { font-size: clamp(3rem, 14vw, 5.2rem); }
  .house-nav { gap: .43rem; padding-inline: .6rem; letter-spacing: .045em; }
}

@media (max-height: 520px) and (orientation: landscape) {
  .threshold,
  .ending {
    align-content: end;
    padding: 1.4rem 2rem;
    padding-bottom: max(2rem, env(safe-area-inset-bottom));
  }

  h1 { font-size: clamp(3rem, 11vw, 5.2rem); }
  .ending p { font-size: clamp(2.7rem, 9vw, 4.6rem); }
}

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