/* NULL//ROOM — interface skin. Cold greys, one accent colour, monospace everywhere. */

:root {
  --ink: #c9ccd4;
  --ink-dim: #6d717c;
  --ink-faint: #3a3d45;
  --paper: #0a0b0e;
  --accent: #8fa8c8;
  --warn: #c8725a;
  --font: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "DejaVu Sans Mono", "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
  color: var(--ink);
  font-family: var(--font);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  cursor: default;
}

#app { position: fixed; inset: 0; }
#app canvas { display: block; width: 100%; height: 100%; }

#ui { position: fixed; inset: 0; pointer-events: none; user-select: none; }

.hidden { display: none !important; }

/* ---------------------------------------------------------- atmosphere ---- */

#grain {
  position: absolute; inset: -50%;
  opacity: .045;
  background-image: repeating-linear-gradient(0deg, rgba(255,255,255,.55) 0 1px, transparent 1px 3px);
  animation: drift 8s steps(24) infinite;
  mix-blend-mode: overlay;
}
@keyframes drift {
  0%   { transform: translate3d(0, 0, 0); }
  50%  { transform: translate3d(-1%, 1%, 0); }
  100% { transform: translate3d(0, 0, 0); }
}

#vignette {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at center, transparent 42%, rgba(0,0,0,.55) 88%, rgba(0,0,0,.85) 100%);
}

#fade {
  position: absolute; inset: 0;
  background: #000;
  opacity: 0;
}

/* ------------------------------------------------------------ crosshair ---- */

#crosshair {
  position: absolute; left: 50%; top: 50%;
  width: 22px; height: 22px;
  margin: -11px 0 0 -11px;
  transition: transform .18s ease, opacity .2s ease;
}
#crosshair span {
  display: block; position: absolute; left: 50%; top: 50%;
  width: 3px; height: 3px; margin: -1.5px 0 0 -1.5px;
  background: rgba(201, 204, 212, .55);
  border-radius: 50%;
  transition: all .16s ease;
}
#crosshair.active {
  transform: scale(1.55) rotate(45deg);
}
#crosshair.active span {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(143, 168, 200, .8);
  width: 5px; height: 5px; margin: -2.5px 0 0 -2.5px;
  border-radius: 0;
}

/* ------------------------------------------------------------------ hud ---- */

#hud { position: absolute; inset: 0; }

#hud-visit {
  position: absolute; left: 26px; bottom: 22px;
  font-size: 11px; letter-spacing: .34em; color: var(--ink-dim);
  text-transform: uppercase;
}

#hud-prompt {
  position: absolute; left: 50%; top: 56%;
  transform: translateX(-50%);
  font-size: 12px; letter-spacing: .22em; color: var(--ink);
  text-transform: uppercase;
  text-shadow: 0 1px 6px #000;
  opacity: 0;
  transition: opacity .15s ease;
  white-space: nowrap;
}
#hud-prompt.show { opacity: .92; }
#hud-prompt b { color: var(--accent); font-weight: 400; }

#hud-hint {
  position: absolute; right: 26px; bottom: 22px;
  font-size: 10px; letter-spacing: .18em; color: var(--ink-faint);
  text-transform: uppercase;
}

#subtitle {
  position: absolute; left: 50%; bottom: 12%;
  transform: translateX(-50%);
  max-width: 62ch;
  text-align: center;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .12em;
  color: var(--ink);
  opacity: 0;
  transition: opacity .5s ease;
  text-shadow: 0 2px 10px #000;
}
#subtitle.show { opacity: .95; }

/* ------------------------------------------------------------- terminal ---- */

#terminal {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: min(680px, 82vw);
  padding: 26px 28px 22px;
  background: rgba(6, 7, 10, .93);
  border: 1px solid #1d2027;
  box-shadow: 0 30px 90px rgba(0,0,0,.75), inset 0 0 60px rgba(80,120,160,.045);
  pointer-events: auto;
}
#terminal::before {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, rgba(143,168,200,.05) 0 1px, transparent 1px 3px);
  pointer-events: none;
}
#terminal-log {
  font-size: 13px; line-height: 1.85; letter-spacing: .1em;
  color: #9fb4cc;
  max-height: 44vh; overflow: hidden;
  margin-bottom: 14px;
  white-space: pre-wrap;
}
#terminal-log .echo { color: var(--ink-dim); }
#terminal-log .warn { color: var(--warn); }
#terminal-log .good { color: #86b28c; }
#terminal-line { display: flex; align-items: center; gap: 10px; }
#terminal-caret { color: var(--accent); font-size: 13px; }
#terminal-input {
  flex: 1;
  background: transparent; border: 0; outline: 0;
  color: var(--ink); font-family: var(--font); font-size: 13px;
  letter-spacing: .18em; text-transform: uppercase;
  caret-color: var(--accent);
}

/* ----------------------------------------------------------------- read ---- */

#read {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: min(560px, 80vw);
  padding: 40px 44px;
  background: #d9d6cc;
  color: #17181b;
  box-shadow: 0 40px 120px rgba(0,0,0,.8);
  pointer-events: auto;
}
#read-body {
  font-size: 15px; line-height: 1.9; letter-spacing: .06em;
  white-space: pre-wrap;
}

/* -------------------------------------------------------------- overlay ---- */

#overlay {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(3, 4, 6, .82);
  opacity: 0;
  pointer-events: none;
}
#overlay.show { opacity: 1; pointer-events: auto; }
#overlay-inner {
  text-align: center;
  max-width: min(720px, 86vw);
  padding: 0 20px;
}

.title {
  font-size: clamp(34px, 8vw, 82px);
  letter-spacing: .3em;
  margin: 0 0 6px;
  font-weight: 400;
  color: var(--ink);
  text-shadow: 0 0 40px rgba(143, 168, 200, .18);
}
.title .slash { color: var(--ink-faint); }
.subtitle-line {
  font-size: 12px; letter-spacing: .42em; color: var(--ink-dim);
  text-transform: uppercase; margin-bottom: 42px;
}
.body-text {
  font-size: 13.5px; line-height: 2; letter-spacing: .13em;
  color: var(--ink-dim); margin: 0 auto 36px;
  max-width: 56ch;
}
.keycap {
  display: inline-block;
  border: 1px solid #262a32;
  padding: 2px 8px; margin: 0 3px;
  font-size: 11px; letter-spacing: .1em; color: var(--ink);
  border-radius: 2px;
}
.cta {
  font-size: 12px; letter-spacing: .34em; color: var(--accent);
  text-transform: uppercase;
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: .35 } 50% { opacity: 1 } }

.enter-btn {
  pointer-events: auto;
  background: transparent;
  border: 1px solid #2b3038;
  color: var(--ink);
  font-family: var(--font);
  font-size: 12px; letter-spacing: .34em;
  padding: 14px 34px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all .25s ease;
}
.enter-btn:hover { border-color: var(--accent); color: #fff; background: rgba(143,168,200,.06); }

.residue {
  font-size: 13px; letter-spacing: .3em; color: var(--ink-faint);
  text-transform: uppercase; margin-top: 34px; min-height: 1.2em;
}

/* --------------------------------------------------------- model readout ---- */

.model-table {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px 16px;
  margin: 0 auto 30px;
  width: min(460px, 76vw);
  font-size: 11.5px; letter-spacing: .2em;
  text-align: left;
  text-transform: uppercase;
}
.model-table .k { color: var(--ink-dim); }
.model-table .bar { position: relative; height: 1px; background: #23262d; margin-top: .62em; }
.model-table .bar i { position: absolute; left: 0; top: -1px; height: 3px; background: var(--accent); display: block; }
.model-table .v { color: var(--ink); text-align: right; font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- error ---- */

#boot-error {
  position: absolute; inset: 0;
  background: #05060a; color: var(--warn);
  padding: 8vh 6vw; overflow: auto; pointer-events: auto;
}
#boot-error h1 { font-size: 14px; letter-spacing: .3em; text-transform: uppercase; font-weight: 400; }
#boot-error pre { font-size: 11px; line-height: 1.6; white-space: pre-wrap; color: var(--ink-dim); }

@media (max-width: 620px) {
  #hud-hint { display: none; }
  #terminal { padding: 18px; }
}