:root {
  --ink: #1A1714;
  --paper: #F7EEDC;
  --hud-bg: rgba(20, 16, 12, 0.74);
  --hud-fg: #F3EEE4;
  --hud-dim: #B3AA9A;
  --accent: #F0563A;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; overflow: hidden; background: #1E1B16; color: var(--hud-fg); font-family: 'IBM Plex Sans', sans-serif; }
#scene { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: grab; }
#scene.dragging { cursor: grabbing; }

.pill { background: var(--hud-bg); color: var(--hud-fg); border-radius: 999px; padding: 8px 16px; font-size: 13px; backdrop-filter: blur(4px); }
.btn { border: 1px solid rgba(243, 238, 228, 0.6); cursor: pointer; font: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; min-height: 44px; }
.btn:hover, .btn:focus-visible { border-color: #fff; background: rgba(20, 16, 12, 0.9); }
.round { width: 44px; height: 44px; padding: 0; justify-content: center; }
#audio[aria-pressed="false"] .wave { display: none; }

#hud { position: fixed; inset: 0; pointer-events: none; }
#hud > * { pointer-events: auto; }
#title { position: absolute; left: calc(16px + env(safe-area-inset-left, 0px)); top: calc(16px + env(safe-area-inset-top, 0px)); font-family: 'IBM Plex Mono', monospace; letter-spacing: 0.08em; text-transform: uppercase; font-size: 12px; }
#compass { position: absolute; left: 50%; top: calc(16px + env(safe-area-inset-top, 0px)); transform: translateX(-50%); display: flex; align-items: center; gap: 10px; padding: 4px 6px; font-family: 'IBM Plex Mono', monospace; font-size: 12px; letter-spacing: 0.06em; }
#compass button { width: 36px; height: 36px; border-radius: 50%; border: none; background: transparent; color: var(--hud-fg); font-size: 22px; cursor: pointer; line-height: 1; }
#compass button:hover { background: rgba(255, 255, 255, 0.1); }
#wall-name { min-width: 160px; text-align: center; padding: 4px 10px; border-radius: 999px; background: var(--accent); color: #fff; font-weight: 700; }
#hint { position: absolute; left: calc(16px + env(safe-area-inset-left, 0px)); bottom: calc(16px + env(safe-area-inset-bottom, 0px)); transition: opacity 0.6s; }
#corner { position: absolute; right: calc(16px + env(safe-area-inset-right, 0px)); bottom: calc(16px + env(safe-area-inset-bottom, 0px)); display: flex; gap: 10px; }
#back { position: absolute; left: calc(16px + env(safe-area-inset-left, 0px)); top: calc(64px + env(safe-area-inset-top, 0px)); }
#help { position: absolute; left: 50%; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); font-family: 'IBM Plex Mono', monospace; font-size: 12px; text-align: center; max-width: calc(100% - 32px); }

#hotspots { position: absolute; inset: 0; pointer-events: none; }
.hot { position: absolute; transform: translate(-50%, -50%); pointer-events: auto; width: 34px; height: 34px; border-radius: 50%; border: 2px solid #fff; background: rgba(240, 86, 58, 0.78); color: #fff; font: 700 13px 'IBM Plex Mono', monospace; cursor: pointer; box-shadow: 0 0 0 0 rgba(240, 86, 58, 0.6); animation: ping 2.6s infinite; padding: 0; }
.hot::before { content: ''; position: absolute; inset: -6px; border-radius: 50%; }
.hot .tip { position: absolute; left: 42px; top: 50%; transform: translateY(-50%); white-space: nowrap; background: rgba(20, 16, 12, 0.9); color: var(--hud-fg); padding: 7px 11px; border-radius: 8px; font: 400 13px/1.35 'IBM Plex Sans', sans-serif; text-align: left; opacity: 0; pointer-events: none; transition: opacity 0.2s; }
.hot .tip strong { display: block; font-weight: 600; }
.hot .tip span { color: var(--hud-dim); }
.hot:hover .tip, .hot:focus-visible .tip { opacity: 1; }
.hot.flip .tip { left: auto; right: 42px; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(240, 86, 58, 0.55); } 70% { box-shadow: 0 0 0 12px rgba(240, 86, 58, 0); } 100% { box-shadow: 0 0 0 0 rgba(240, 86, 58, 0); } }
body.focused .hot, body.focused #hint { display: none; }

#remote { position: fixed; right: 16px; bottom: 76px; width: 220px; padding: 14px; border-radius: 26px; background: #2B2B2E; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5); display: flex; flex-direction: column; gap: 10px; }
#remote[hidden] { display: none; }
#remote-display { height: 36px; border-radius: 6px; background: #0A0A0A; color: #5CF27A; font: 700 18px 'IBM Plex Mono', monospace; letter-spacing: 3px; display: flex; align-items: center; justify-content: center; }
#remote .digits { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
#remote .digits button, #remote .av-keys button { height: 40px; border: none; border-radius: 10px; background: #4A4A50; color: #F3EEE4; font: 700 15px 'IBM Plex Mono', monospace; cursor: pointer; }
#remote button:active { transform: translateY(1px); background: #5A5A60; }
#remote .fastext { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
#remote .fastext button { height: 36px; border: none; border-radius: 8px; font: 700 9px 'IBM Plex Mono', monospace; cursor: pointer; overflow: hidden; }
#remote .av-keys { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
#remote .av-keys[hidden] { display: none; }

#overlay { position: fixed; inset: 0; background: rgba(20, 16, 12, 0.55); display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 10; }
#overlay[hidden] { display: none; }
#overlay-close { position: absolute; right: 16px; top: 16px; }
#overlay-card { max-width: min(920px, 100%); max-height: calc(100% - 72px); overflow: auto; color: var(--ink); }

/* paper things */
.sheet { background: #FBF8F0; color: var(--ink); border-radius: 4px; box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45); padding: 28px; position: relative; }
.sheet::after { content: ''; position: absolute; inset: 0; pointer-events: none; border-radius: 4px; background-image: repeating-linear-gradient(-45deg, rgba(26, 23, 20, 0.025) 0 1px, transparent 1px 5px); }
.hand { font-family: 'Caveat', cursive; }
.mono { font-family: 'IBM Plex Mono', monospace; }

.album { display: grid; grid-template-columns: 1fr 1fr; gap: 0; background: #8A2E2A; padding: 12px; border-radius: 8px; box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45); perspective: 1600px; }
.album .page { background: #F1E6CC; min-height: 440px; padding: 22px 18px; display: grid; grid-template-rows: 1fr 1fr; gap: 14px; position: relative; transform-origin: left center; transition: transform 0.55s ease-in-out; }
.album .page.left { border-right: 3px solid #C9B9A0; transform-origin: right center; }
.album .page.turn-fwd { transform: rotateY(-100deg); }
.album .page.turn-back { transform: rotateY(100deg); }
.photo { justify-self: center; align-self: center; background: #fff; padding: 8px 8px 0; box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2); position: relative; width: min(220px, 90%); }
.photo .img { aspect-ratio: 4 / 3; background-size: cover; background-position: center; }
.photo .cap { font: 700 20px 'Caveat', cursive; text-align: center; padding: 4px 0 6px; color: #2A1A10; }
.photo .corner { position: absolute; width: 16px; height: 16px; background: var(--ink); }
.photo .c1 { left: -4px; top: -4px; clip-path: polygon(0 0, 100% 0, 0 100%); }
.photo .c2 { right: -4px; bottom: 26px; clip-path: polygon(100% 0, 100% 100%, 0 100%); }
.album-nav { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; color: var(--hud-fg); }
.album-nav button, .tabs button { min-height: 44px; }

.notebook { display: grid; grid-template-columns: 200px 1fr; gap: 18px; }
.tabs { display: flex; flex-direction: column; gap: 8px; }
.tabs button { text-align: left; border: none; border-radius: 4px; padding: 10px 12px; cursor: pointer; font: 700 20px 'Caveat', cursive; color: #2A1A10; box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25); }
.tabs button[aria-pressed="true"] { outline: 3px solid #fff; }
.lined { background-color: #FBF8F0; background-image: repeating-linear-gradient(transparent 0 31px, #C9D8E6 31px 32px); line-height: 32px; padding: 8px 28px 28px 56px; min-height: 460px; position: relative; font: 500 22px 'Caveat', cursive; color: #2A3A6A; white-space: pre-wrap; border-radius: 3px; box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45); }
.lined::before { content: ''; position: absolute; left: 44px; top: 0; bottom: 0; width: 1px; background: #E58C8A; }
.lined h2 { margin: 0 0 0; font: 700 30px/64px 'Caveat', cursive; color: #B6402A; }

.card { width: min(380px, 100%); font-family: 'Courier Prime', monospace; font-size: 15px; line-height: 1.6; transform: rotate(-2deg); }
.card .num { color: #9A8A72; font-size: 12px; }
.card .thanks { font: 700 34px 'Caveat', cursive; color: #B6402A; margin-top: 8px; }
.card hr { border: none; border-top: 1px dashed #C9B9A0; }

.credits { width: min(560px, 100%); height: min(520px, 80vh); overflow: hidden; background: #0d0c0a; color: #F3EEE4; border-radius: 6px; position: relative; text-align: center; font-family: 'IBM Plex Sans', sans-serif; }
.credits .roll { position: absolute; left: 0; right: 0; top: 100%; animation: roll 22s linear forwards; padding: 0 24px; }
.credits h2 { font: 800 34px 'Bricolage Grotesque', sans-serif; margin: 0 0 40px; }
.credits .row { margin: 0 0 26px; }
.credits .row span { display: block; color: #B3AA9A; font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; }
.credits .row b { font-weight: 500; font-size: 18px; }
@keyframes roll { to { transform: translateY(calc(-100% - 560px)); } }

.calendar { width: min(420px, 100%); text-align: center; }
.calendar .big { font: 800 64px 'Bricolage Grotesque', sans-serif; margin: 6px 0; color: #B6402A; }

#typer { position: fixed; left: -1000px; top: 0; opacity: 0; width: 10px; height: 10px; font-size: 16px; }

#loading { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; background: #F7EEDC; color: var(--ink); font: 700 30px 'Caveat', cursive; transition: opacity 0.8s; z-index: 20; }
#loading.gone { opacity: 0; pointer-events: none; }

@media (max-width: 640px) {
  #title { display: none; }
  #compass { top: calc(12px + env(safe-area-inset-top, 0px)); }
  #wall-name { min-width: 0; white-space: nowrap; font-size: 11px; }
  #compass { gap: 4px; }
  #hint { bottom: 70px; }
  #remote { right: 50%; transform: translateX(50%); bottom: 70px; }
  .album { grid-template-columns: 1fr; }
  .album .page.left { display: none; }
  .notebook { grid-template-columns: 1fr; }
  .tabs { flex-direction: row; overflow-x: auto; }
  .tabs button { font-size: 16px; white-space: nowrap; }
  .hot .tip { display: none; }
  body.focused #corner { display: none; } /* in a close-up the help line needs the bottom of a phone screen */
}
@media (prefers-reduced-motion: reduce) { .hot { animation: none; } .credits .roll { animation-duration: 60s; } }

/* wall C close-ups: the shelf view and the book you take out (shelfview.js) */
body.shelf #corner, body.shelf #hint { display: none; }
#shelfui { position: absolute; inset: 0; pointer-events: none; }
#shelfui > * { pointer-events: auto; position: absolute; }
#shelfui[hidden] { display: none; }
.shelf-rows { right: calc(16px + env(safe-area-inset-right, 0px)); top: calc(64px + env(safe-area-inset-top, 0px)); display: flex; align-items: center; gap: 8px; padding: 4px; font: 12px 'IBM Plex Mono', monospace; letter-spacing: 0.04em; }
.shelf-rows .btn { width: 36px; height: 36px; min-height: 36px; font-size: 13px; color: var(--hud-fg); background: transparent; border: none; border-radius: 50%; }
.shelf-rows .btn:disabled { opacity: 0.35; cursor: default; }
.shelf-scroll { top: 50%; transform: translateY(-50%); font-size: 22px; padding: 0; }
.shelf-scroll[data-scroll="1"] { left: calc(12px + env(safe-area-inset-left, 0px)); }
.shelf-scroll[data-scroll="-1"] { right: calc(12px + env(safe-area-inset-right, 0px)); }
.shelf-hint { left: 50%; bottom: calc(76px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); white-space: nowrap; transition: opacity 0.6s; max-width: calc(100% - 32px); overflow: hidden; text-overflow: ellipsis; }
#shelfui .authors { left: 50%; transform: translateX(-50%); bottom: calc(16px + env(safe-area-inset-bottom, 0px)); max-width: calc(100% - 32px); display: flex; gap: 2px; padding: 4px; overflow-x: auto; scrollbar-width: none; white-space: nowrap; }
#shelfui .authors::-webkit-scrollbar { display: none; }
#shelfui .authors button { flex: none; border: none; background: transparent; color: var(--hud-dim); font: 500 12px 'IBM Plex Mono', monospace; padding: 0 12px; height: 36px; border-radius: 999px; cursor: pointer; }
#shelfui .authors button.on { background: var(--accent); color: #fff; }
#shelfui .authors button:focus-visible, .shelf-rows .btn:focus-visible { outline: 2px solid #fff; }
#shelfui.out .shelf-scroll, #shelfui.out .shelf-hint { display: none; }
@media (max-width: 700px) { .shelf-scroll { display: none; } .shelf-rows span { display: none; } }

#bookcard { position: absolute; left: 50%; transform: translateX(-50%); width: min(600px, calc(100% - 24px)); overflow: auto; color: var(--ink);
  background: #F4EAD3 repeating-linear-gradient(transparent 0 27px, rgba(80, 110, 160, 0.26) 27px 28px); border-radius: 4px; box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5);
  padding: 20px 26px 14px; font-family: 'Courier Prime', monospace; animation: card-in 0.5s 0.35s both; }
#bookcard[hidden] { display: none; }
@keyframes card-in { from { opacity: 0; transform: translate(-50%, 12px); } to { opacity: 1; transform: translate(-50%, 0); } }
@media (prefers-reduced-motion: reduce) { #bookcard { animation: none; } }
#bookcard h2 { font: 700 24px/1.15 'Courier Prime', monospace; margin: 0 0 4px; text-wrap: balance; }
#bookcard .by { font-size: 17px; margin: 0 0 12px; }
#bookcard dl { display: grid; grid-template-columns: auto 1fr; gap: 0 14px; font-size: 15px; line-height: 28px; margin: 0; }
#bookcard dt { color: #7A1F1A; text-transform: uppercase; font-size: 12px; letter-spacing: 0.08em; }
#bookcard dd { margin: 0; }
#bookcard .dim { color: #6E6253; }
#bookcard .note { font: 500 24px/28px 'Caveat', cursive; color: #2A3C8A; margin: 6px 0 0; }
#bookcard .bc-nav { display: flex; justify-content: space-between; gap: 8px; margin-top: 14px; }
#bookcard .bc-nav .btn { background: var(--hud-bg); color: var(--hud-fg); border-radius: 999px; padding: 0 16px; font: 13px 'IBM Plex Sans', sans-serif; }
#bookcard .bc-nav [data-step] { width: 44px; justify-content: center; font-size: 20px; padding: 0; }
@media (max-width: 700px) { #bookcard { padding: 16px 16px 12px; } #bookcard h2 { font-size: 21px; } #bookcard dl { font-size: 14px; } }

/* the loading screen when the room can't be drawn (see the inline script in index.html) */
#loading { flex-direction: column; gap: 18px; padding: 16px; text-align: center; }
.boot-msg { max-width: 30em; font: 16px/1.5 'IBM Plex Sans', sans-serif; }
.boot-msg p { margin: 0 0 12px; }
.boot-msg .lead { font: 700 30px/1.2 'Caveat', cursive; }
.boot-msg .acts { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.boot-msg .why { font: 12px/1.4 'IBM Plex Mono', monospace; color: #6A5A4A; overflow-wrap: anywhere; }
.boot-msg.slow { font-size: 14px; }