/* Helm's Deep - interface chrome.
   The 3D scene is deliberately a gloomy twilight in every case (that is the
   subject), but the surrounding interface follows the reader's colour scheme. */

:root {
  --ink: #e6dcc2;
  --ink-dim: #a89f89;
  --gold: #d3b271;
  --panel: rgba(14, 17, 23, 0.82);
  --panel-edge: rgba(211, 178, 113, 0.28);
  --backdrop: radial-gradient(120% 90% at 50% 20%, #1b222e 0%, #0b0e14 60%, #05070a 100%);
  --kbd-bg: rgba(255, 255, 255, 0.07);
  --kbd-edge: rgba(211, 178, 113, 0.35);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.65);
}

@media (prefers-color-scheme: light) {
  :root {
    --ink: #241d10;
    --ink-dim: #5c5240;
    --gold: #6d4f13;
    --panel: rgba(246, 241, 230, 0.9);
    --panel-edge: rgba(109, 79, 19, 0.3);
    --backdrop: radial-gradient(120% 90% at 50% 20%, #e9e3d4 0%, #cfc7b4 60%, #b6ad98 100%);
    --kbd-bg: rgba(0, 0, 0, 0.06);
    --kbd-edge: rgba(109, 79, 19, 0.35);
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: #05070a;
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
}

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

/* ---------- crosshair ---------- */
#crosshair {
  position: fixed;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .35s ease;
  z-index: 6;
}
#crosshair.on { opacity: .55; }
#crosshair::before,
#crosshair::after {
  content: "";
  position: absolute;
  background: #f4ead2;
  box-shadow: 0 0 4px rgba(0, 0, 0, .9);
}
#crosshair::before { left: 8px; top: 0; width: 2px; height: 18px; }
#crosshair::after { top: 8px; left: 0; height: 2px; width: 18px; }

/* ---------- in-game hud ---------- */
#hud {
  position: fixed;
  left: 18px;
  bottom: 16px;
  z-index: 5;
  pointer-events: none;
  text-shadow: 0 2px 8px rgba(0, 0, 0, .95);
  max-width: min(70vw, 640px);
}
#hud[hidden] { display: none; }
#hud p { margin: 0; }
#location {
  font-size: clamp(16px, 2.4vw, 22px);
  letter-spacing: .1em;
  color: #e8d7a6;
  text-transform: uppercase;
}
#hudKeys {
  margin-top: 4px !important;
  font-size: 12px;
  letter-spacing: .06em;
  color: #b9b09a;
}
#fpsOut {
  margin-top: 2px !important;
  font-size: 11px;
  color: #8b8574;
  font-variant-numeric: tabular-nums;
}

/* ---------- toast ---------- */
#toast {
  position: fixed;
  left: 50%;
  top: 12%;
  transform: translateX(-50%);
  z-index: 7;
  padding: 10px 20px;
  border: 1px solid var(--panel-edge);
  background: rgba(10, 13, 18, .78);
  color: #ead9ab;
  font-size: 14px;
  letter-spacing: .05em;
  border-radius: 3px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .5s ease;
  text-align: center;
  max-width: 80vw;
}
#toast.on { opacity: 1; }

/* ---------- intro / pause plate ---------- */
#intro {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--backdrop);
  overflow: auto;
}
#intro.hidden { display: none; }
#intro.overlay { background: rgba(5, 7, 10, .72); }
@media (prefers-color-scheme: light) {
  #intro.overlay { background: rgba(232, 227, 214, .8); }
}

.plate {
  width: min(880px, 100%);
  padding: clamp(20px, 4vw, 42px);
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 4px;
  box-shadow: var(--shadow);
  text-align: center;
}

.plate h1 {
  margin: 0;
  font-size: clamp(30px, 7vw, 58px);
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
}
.plate .sub {
  margin: 6px 0 26px;
  font-size: clamp(12px, 2.2vw, 15px);
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  text-align: left;
  margin-bottom: 26px;
}
.card {
  border: 1px solid var(--panel-edge);
  border-radius: 3px;
  padding: 16px 18px;
  background: var(--kbd-bg);
}
.card h2 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
}
.card ul { margin: 0; padding: 0; list-style: none; }
.card li {
  margin: 0 0 7px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
}
.card li:last-child { margin-bottom: 0; }
.card li span { color: var(--ink-dim); font-size: 13px; }
.card ul.plain li {
  padding-left: 14px;
  position: relative;
  color: var(--ink-dim);
}
.card ul.plain li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 5px;
  background: var(--gold);
  transform: rotate(45deg);
}

kbd {
  display: inline-block;
  min-width: 22px;
  padding: 2px 6px;
  margin-right: 3px;
  font: 600 11px/1.4 ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  text-align: center;
  color: var(--gold);
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-edge);
  border-radius: 3px;
}

#startBtn {
  appearance: none;
  cursor: pointer;
  font: inherit;
  font-size: clamp(14px, 2.4vw, 17px);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  background: transparent;
  border: 1px solid var(--gold);
  border-radius: 3px;
  padding: 14px 34px;
  transition: background .2s ease, color .2s ease, transform .12s ease;
}
#startBtn:hover { background: var(--gold); color: #12151c; }
#startBtn:focus-visible { outline: 3px solid #7fb4ff; outline-offset: 3px; }
#startBtn:active { transform: translateY(1px); }
@media (prefers-color-scheme: light) {
  #startBtn:hover { color: #f6f1e6; }
}

.note {
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--ink-dim);
}

/* ---------- loading ---------- */
#loadScreen {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  background: var(--backdrop);
  transition: opacity .6s ease;
}
#loadScreen.gone { opacity: 0; pointer-events: none; }
.loadTitle {
  margin: 0;
  font-size: clamp(20px, 5vw, 34px);
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--gold);
}
.bar {
  width: min(340px, 70vw);
  height: 3px;
  background: var(--kbd-bg);
  border: 1px solid var(--panel-edge);
}
.bar i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--gold);
  transition: width .3s ease;
}
#loadPct {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

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