:root {
  --c0: #0d0c0a;
  --c1: #171612;
  --c2: #24221d;
  --c3: #3a3730;
  --c4: #5c574c;
  --sodium: #f2a93b;
  --sodium-hi: #ffd583;
  --sodium-lo: #a8641a;
  --rust: #8a3a1c;
  --rust-hi: #c4592b;
  --paper: #ebe3cd;
  --paper-2: #d9cdae;
  --paper-3: #bfb08c;
  --ink: #1e1b16;
  --ink-2: #4d463a;
  --ink-3: #7a705e;
  --red: #b1291f;
  --crt: #86f2a0;
  --crt-dim: #2f6b42;
  --stencil: "Big Shoulders Stencil", "Arial Narrow", Impact, sans-serif;
  --cond: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "Barlow", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --ease: cubic-bezier(.2, .8, .2, 1);
  --drop: cubic-bezier(.6, 0, .9, .4);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
html { background: var(--c0); }
body {
  background:
    radial-gradient(ellipse 90% 55% at 50% -10%, rgba(242, 169, 59, .22), transparent 70%),
    radial-gradient(ellipse at 50% 120%, rgba(138, 58, 28, .25), transparent 60%),
    linear-gradient(var(--c1), var(--c0));
  background-color: var(--c0);
  color: var(--paper);
  font: 400 17px/1.5 var(--body);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 50;
  opacity: .16;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- The great stair (title and hub art) ---------- */

.stairs {
  position: absolute;
  inset: 0 0 auto;
  overflow: hidden;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(#000 45%, transparent);
  mask-image: linear-gradient(#000 45%, transparent);
}
/* The rotating layer is a square centred on the stair well, so its corners never show. */
.stair-spin {
  position: absolute;
  left: 50%;
  top: 46%;
  width: max(125vw, 125vh, 760px);
  aspect-ratio: 1;
  translate: -50% -50%;
  will-change: transform;
  animation: spin 160s linear infinite;
}
.stair-spin svg { display: block; width: 100%; height: 100%; }
.stairs::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 46%, #000 0, rgba(0, 0, 0, .6) 6%, transparent 14%),
    radial-gradient(circle at 50% 46%, rgba(242, 169, 59, .16), transparent 45%);
}
@keyframes spin { to { transform: rotate(-360deg); } }
.hidden-page .stair-spin { animation-play-state: paused; }
@media (prefers-reduced-motion: reduce) { .stair-spin { animation: none; } }

[hidden] { display: none !important; }
body:not(.fonts) :is(h1, .notice h2, .second b) { visibility: hidden; }

.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  overflow-x: hidden;
}

.kicker {
  margin: 0;
  font: 600 13px var(--cond);
  letter-spacing: .36em;
  text-transform: uppercase;
  color: var(--sodium);
  text-shadow: 0 0 12px rgba(242, 169, 59, .5);
}

/* ---------- Controls ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font: 700 17px/1 var(--cond);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper);
  background: linear-gradient(var(--c3), var(--c2));
  border: 1px solid var(--c4);
  border-radius: 4px;
  padding: 15px 18px;
  min-height: 50px;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08), 0 4px 0 #0a0908, 0 8px 18px rgba(0, 0, 0, .45);
  transition: transform .12s var(--ease), box-shadow .12s, filter .15s;
}
.btn { text-decoration: none; }
.btn.small { font-size: 13px; padding: 10px 12px; min-height: 40px; }
.btn svg { width: 18px; height: 18px; flex: none; }
.btn:hover { filter: brightness(1.15); }
.btn:active { transform: translateY(3px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08), 0 1px 0 #0a0908, 0 3px 8px rgba(0, 0, 0, .45); }
.btn:focus-visible, .opt:focus-visible, .icon-btn:focus-visible, .link-btn:focus-visible, .previous:focus-visible { outline: 2px solid var(--sodium-hi); outline-offset: 3px; }
.btn.primary {
  color: #1a1206;
  border-color: var(--sodium-hi);
  background:
    repeating-linear-gradient(-45deg, transparent 0 14px, rgba(0, 0, 0, .06) 14px 28px),
    linear-gradient(var(--sodium-hi), var(--sodium) 60%, #d98c26);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .5), 0 4px 0 var(--sodium-lo), 0 10px 26px rgba(242, 169, 59, .25);
}
.btn.primary:active { box-shadow: inset 0 1px 0 rgba(255, 255, 255, .5), 0 1px 0 var(--sodium-lo), 0 4px 10px rgba(242, 169, 59, .2); }
.row { display: flex; gap: 10px; }
.row > * { flex: 1; }

.icon-btn {
  appearance: none;
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--c4);
  background: rgba(0, 0, 0, .35);
  color: var(--paper-2);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.icon-btn:hover { color: var(--sodium-hi); border-color: var(--sodium); }
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn.corner {
  position: absolute;
  top: calc(env(safe-area-inset-top) + 12px);
  right: calc(env(safe-area-inset-right) + 12px);
  z-index: 5;
}
.link-btn {
  appearance: none;
  background: none;
  border: 0;
  padding: 10px 6px;
  font: 600 14px var(--cond);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper-3);
  cursor: pointer;
}
.link-btn:disabled { opacity: 0; pointer-events: none; }
.link-btn:hover { color: var(--sodium-hi); }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom) + 24px);
  z-index: 60;
  transform: translate(-50%, 20px);
  opacity: 0;
  padding: 12px 18px;
  font: 500 13px var(--mono);
  color: var(--crt);
  background: #050605;
  border: 1px solid var(--crt-dim);
  border-radius: 3px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .6);
  transition: opacity .25s, transform .25s var(--ease);
  pointer-events: none;
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

.back {
  position: absolute;
  top: calc(env(safe-area-inset-top) + 12px);
  left: calc(env(safe-area-inset-left) + 16px);
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 12px 0 10px;
  border: 1px solid var(--c4);
  border-radius: 3px;
  background: rgba(0, 0, 0, .35);
  font: 600 13px/1 var(--cond);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--paper-2);
  text-decoration: none;
  transition: color .15s, border-color .15s;
}
.back::before { content: "\2190"; font-family: var(--body); letter-spacing: 0; }
.back:hover { color: var(--sodium-hi); border-color: var(--sodium); }
.back:focus-visible { outline: 2px solid var(--sodium-hi); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-delay: 0s !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}