/* World mode, shared by every page: the 3D layers, the heads-up display, the
   datapad that shows pages in the warehouse, and the CRT / signal-tear effects.
   Colours are fixed here (not page tokens) because the HUD looks the same on the
   amber terminal and the paper reader. */

html.in-world, html.in-world body { overflow: hidden; height: 100%; }
html.in-world .crt,
html.in-world .bar,
html.in-world .foot,
html.in-world .skip-link { display: none; }

.world-gl, .world-css { position: fixed; inset: 0; }
.world-gl { z-index: 0; display: block; width: 100%; height: 100%; opacity: 0; transition: opacity .6s; }
.world-gl.is-on { opacity: 1; }
.world-css { z-index: 1; pointer-events: none; }

/* the terminal, re-parented onto the monitor */
.world-screen {
  pointer-events: auto;
  background: var(--bg);
  overflow-y: auto;
  overflow-x: hidden;
}
.world-screen::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(to bottom, rgba(0, 0, 0, .28) 0 1px, transparent 1px 3px),
    radial-gradient(ellipse at center, transparent 55%, rgba(0, 0, 0, .55));
}
.world-screen .rig { max-width: none; }

.world-tip {
  position: fixed;
  z-index: 5;
  pointer-events: none;
  padding: .25rem .5rem;
  font: .72rem var(--font-crt);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #031210;
  background: #2ad4c9;
  transform: translate(12px, 12px);
  opacity: 0;
  transition: opacity .15s;
}
.world-tip.is-on { opacity: 1; }

/* the reading app's own elements while you're out in the warehouse */
.world-hidden { opacity: 0 !important; visibility: hidden; transition: opacity .5s, visibility 0s .5s; }

/* ---------------------------------------------------------------- HUD */

.world-ui {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 4;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1rem calc(.8rem + env(safe-area-inset-bottom));
  pointer-events: none;
  opacity: 0;
  transition: opacity .4s;
  font-family: var(--font-crt);
  text-transform: uppercase;
}
.world-ui.is-on { opacity: 1; }
.world-ui.is-on > * { pointer-events: auto; }

.world-hud, .world-leave {
  background: rgba(10, 8, 5, .8);
  border: 1px solid #b37a00;
  border-radius: 4px;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  box-shadow: 0 0 18px rgba(255, 176, 0, .12);
}
.world-hud {
  display: flex;
  gap: .25rem;
  padding: .25rem;
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
}
.world-hud button, .world-leave {
  font: .78rem var(--font-crt);
  letter-spacing: .12em;
  text-transform: uppercase;
  white-space: nowrap;
  color: #ffb000;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  padding: .45rem .7rem;
  cursor: pointer;
}
.world-hud button:hover { color: #2ad4c9; border-color: rgba(42, 212, 201, .5); }
.world-hud button[aria-current="true"] { color: #120c00; background: #ffb000; }
.world-leave { display: inline-flex; align-items: center; gap: .5em; border-color: #b37a00; }
.world-leave:hover { color: #031210; background: #2ad4c9; border-color: #2ad4c9; }
.world-leave .jack-icon, .datapad .jack-icon {
  width: 1.2em; height: 1.2em;
  fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.world-hint {
  flex-basis: 100%;
  margin: 0;
  text-align: center;
  font-size: .66rem;
  letter-spacing: .14em;
  color: #7a5a1e;
  text-shadow: 0 1px 4px #000;
}
@media (max-width: 640px) {
  .world-hint { display: none; }
  .world-ui { gap: .4rem; padding-left: 8px; padding-right: 8px; }
}

/* ---------------------------------------------------------------- datapad */
/* A page shown inside the world: same reader styles, in a floating panel.
   Starts full-screen (is-full) when a flat page jacks out, so the handoff is seamless. */

.datapad {
  /* reader night palette, independent of the page it's opened on */
  --bg: #0d0f14;
  --bg-raised: #141821;
  --ink: #e6e1d6;
  --ink-soft: #b3ada2;
  --ink-dim: #7d8590;
  --rule: #262c38;
  --link: #ffb54a;
  --link-hover: #2ad4c9;
  --mark: #ffb000;

  position: fixed;
  z-index: 3;
  top: 4vh;
  bottom: calc(5.4rem + env(safe-area-inset-bottom));
  left: 50%;
  width: min(46rem, calc(100vw - 2rem));
  display: flex;
  flex-direction: column;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font-serif);
  border: 1px solid #b37a00;
  border-radius: 8px;
  box-shadow: 0 0 0 4px rgba(10, 8, 5, .55), 0 30px 80px rgba(0, 0, 0, .65), 0 0 34px rgba(255, 176, 0, .16);
  overflow: hidden;
  opacity: 0;
  transform: translateX(-50%) scale(.96);
  pointer-events: none;
  transition: opacity .3s, transform .3s,
    top .6s cubic-bezier(.2, .7, .2, 1), bottom .6s cubic-bezier(.2, .7, .2, 1),
    width .6s cubic-bezier(.2, .7, .2, 1), border-radius .6s, border-color .6s;
}
:root[data-theme="paper"] .datapad {
  --bg: #f6f1e7; --bg-raised: #efe8da; --ink: #23201b; --ink-soft: #4a443b; --ink-dim: #857c6e;
  --rule: #ddd3c1; --link: #a24a00; --link-hover: #0a7d76; --mark: #e09a00;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="night"]) .datapad {
    --bg: #f6f1e7; --bg-raised: #efe8da; --ink: #23201b; --ink-soft: #4a443b; --ink-dim: #857c6e;
    --rule: #ddd3c1; --link: #a24a00; --link-hover: #0a7d76; --mark: #e09a00;
  }
}
.datapad.is-open { opacity: 1; transform: translateX(-50%); pointer-events: auto; }
.datapad.is-full { top: 0; bottom: 0; width: 100vw; border-radius: 0; border-color: transparent; }

.datapad-bar {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .6rem .5rem .9rem;
  font: .74rem var(--font-mono);
  color: var(--ink-dim);
  background: var(--bg-raised);
  border-bottom: 1px solid var(--rule);
}
.datapad-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.datapad-title::before { content: '▤ '; color: #ffb000; }
.datapad-bar button {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  font: inherit;
  color: var(--ink-soft);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: .25rem .55rem;
  cursor: pointer;
}
.datapad-bar button:hover { color: var(--link-hover); border-color: var(--link-hover); }
.datapad-body { flex: 1; overflow-y: auto; overscroll-behavior: contain; }
.datapad-body .reader { padding: 2.4rem 1.2rem 3rem; }
.datapad-body .prose figure { margin-left: 0; margin-right: 0; }
.datapad-body .prose figcaption { margin-left: 0; margin-right: 0; }

@media (max-width: 640px) {
  .datapad { top: 8px; width: calc(100vw - 16px); bottom: calc(4.4rem + env(safe-area-inset-bottom)); }
}

/* ---------------------------------------------------------------- CRT power-on / signal tear */

/* Old-CRT power-on: a bright dot stretches to a line, the line opens into the
   picture, brightness settles. Used on first boot and when the plug goes back in. */
.crt-on {
  animation: crt-on .8s cubic-bezier(.2, .7, .2, 1) both;
  transform-origin: 50% 45%;
}
@keyframes crt-on {
  0%   { transform: scale(.015, .003); filter: brightness(9) saturate(0); }
  20%  { transform: scale(1, .003);    filter: brightness(9) saturate(0); }
  48%  { transform: scale(1, 1);       filter: brightness(2.4) saturate(.6); }
  62%  { filter: brightness(.65); }
  76%  { filter: brightness(1.35); }
  100% { transform: none;              filter: none; }
}

/* Jacking out: chromatic split + a torn band for a quarter second. */
.is-unplugging { animation: signal-tear .26s steps(4) both; }
@keyframes signal-tear {
  0%   { transform: none; filter: none; clip-path: none; }
  25%  { transform: translateX(-6px) skewX(3deg); filter: drop-shadow(4px 0 0 rgba(255, 30, 60, .85)) drop-shadow(-4px 0 0 rgba(0, 220, 255, .85)) brightness(1.5); }
  50%  { transform: translate(5px, 2px); clip-path: inset(18% 0 48% 0); filter: brightness(2.2) saturate(0); }
  75%  { transform: translateX(-2px); clip-path: inset(0 0 0 0); filter: drop-shadow(-3px 0 0 rgba(255, 30, 60, .8)) drop-shadow(3px 0 0 rgba(0, 220, 255, .8)); }
  100% { transform: none; filter: none; clip-path: none; }
}

/* ---------------------------------------------------------------- the way out: bezel + close ✕ */
/* Every page is a screen in the warehouse. Its edge is a thin bezel; hovering
   it pulls the bezel back to show the room behind (--world-peek, a render of
   this page's place set by uplink.js once the world has loaded). Clicking the
   edge, or the ✕ in the screen's chrome, steps out into the warehouse. */

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

@property --peek-tint { syntax: '<color>'; inherits: false; initial-value: rgba(5, 4, 3, .9); }

.bezel { display: none; }
html.has-uplink:not(.in-world) .bezel { display: block; }

.bezel-edge {
  --peek-tint: rgba(5, 4, 3, .9);
  position: fixed;
  z-index: 70;
  cursor: pointer;
  background:
    linear-gradient(var(--peek-tint), var(--peek-tint)),
    var(--world-peek, radial-gradient(ellipse at 30% 40%, rgba(42, 212, 201, .5), transparent 60%), radial-gradient(ellipse at 70% 60%, rgba(255, 140, 30, .5), transparent 60%), #07080c);
  background-size: 100vw 100vh;
  background-position: center;
  background-attachment: fixed;
  transition: width .32s cubic-bezier(.2, .7, .2, 1), height .32s cubic-bezier(.2, .7, .2, 1), --peek-tint .32s;
}
.bezel-edge[data-edge="top"]    { top: 0; left: 0; right: 0; height: 7px; box-shadow: inset 0 -1px 0 rgba(255, 176, 0, .28); }
.bezel-edge[data-edge="bottom"] { bottom: 0; left: 0; right: 0; height: 7px; box-shadow: inset 0 1px 0 rgba(255, 176, 0, .28); }
.bezel-edge[data-edge="left"]   { top: 0; bottom: 0; left: 0; width: 7px; box-shadow: inset -1px 0 0 rgba(255, 176, 0, .28); }
.bezel-edge[data-edge="right"]  { top: 0; bottom: 0; right: 0; width: 7px; box-shadow: inset 1px 0 0 rgba(255, 176, 0, .28); }

/* peeking: the screen draws back, the room shows through, light spills in */
html.is-peeking .bezel-edge { --peek-tint: rgba(5, 4, 3, .12); }
html.is-peeking .bezel-edge[data-edge="top"],
html.is-peeking .bezel-edge[data-edge="bottom"] { height: 34px; }
html.is-peeking .bezel-edge[data-edge="left"],
html.is-peeking .bezel-edge[data-edge="right"] { width: 34px; }
html.is-peeking .bezel-edge[data-edge="top"]    { box-shadow: inset 0 -1px 0 rgba(255, 176, 0, .6), 0 10px 30px rgba(42, 212, 201, .18); }
html.is-peeking .bezel-edge[data-edge="bottom"] { box-shadow: inset 0 1px 0 rgba(255, 176, 0, .6), 0 -10px 30px rgba(42, 212, 201, .18); }
html.is-peeking .bezel-edge[data-edge="left"]   { box-shadow: inset -1px 0 0 rgba(255, 176, 0, .6), 10px 0 30px rgba(255, 140, 30, .16); }
html.is-peeking .bezel-edge[data-edge="right"]  { box-shadow: inset 1px 0 0 rgba(255, 176, 0, .6), -10px 0 30px rgba(255, 140, 30, .16); }

.bezel-hint {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font: .64rem/1 var(--font-crt);
  letter-spacing: .2em;
  text-transform: uppercase;
  white-space: nowrap;
  color: #ffb000;
  text-shadow: 0 0 8px rgba(255, 176, 0, .6), 0 1px 3px #000;
  opacity: 0;
  transition: opacity .2s .1s;
}
html.is-peeking .bezel-hint { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  .bezel-edge { transition: none; }
}

/* close ✕: window chrome on the screen, with an uplink LED */
.screen-x {
  position: relative;
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  color: inherit;
  background: transparent;
  border: 1px solid currentColor;
  border-radius: 4px;
  cursor: pointer;
  opacity: .7;
  transition: opacity .15s, color .15s, background .15s, border-color .15s;
}
.screen-x[hidden] { display: none; }
.screen-x svg { width: 12px; height: 12px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.screen-x:hover, .screen-x:focus-visible { opacity: 1; color: #031210; background: #2ad4c9; border-color: #2ad4c9; }
.screen-x-led {
  position: absolute;
  top: -3px;
  right: -3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3a3226;
  box-shadow: 0 0 0 2px var(--bg);
}
.screen-x[data-state="syncing"] .screen-x-led { background: #ffb000; animation: blink .6s steps(1) infinite; }
.screen-x[data-state="ready"] .screen-x-led { background: #2ad4c9; box-shadow: 0 0 0 2px var(--bg), 0 0 8px #2ad4c9; }
.screen-x[data-state="failed"] .screen-x-led { background: #ff6a1a; }
@keyframes blink { 50% { opacity: 0; } }

/* reader pages: the ✕ sits at the end of the top bar (the screen's title bar) */
.screen-x--bar { color: var(--ink-dim); }
/* terminal: top-right corner of the main panel */
.screen-x--panel {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 6;
  color: var(--ink);
  background: var(--panel);
  text-shadow: none;
}
@media (max-width: 899px) {
  .screen-x--panel { top: 10px; right: 10px; }
}

/* the reading shelf app: top-right of its header */
.screen-x--app { color: #000; margin-left: .75rem; }