/* [project]ion page: the "Light Table" palette of the art bible (§1, §3.1).
   Paper ground with a faint contact-sheet grid, Graphite ink (never black), Ion for the one thing to
   use, Brass for marks. */
:root {
  --paper: #EFEBE3;
  --plaster: #E4DDD0;
  --limestone: #D7CDBB;
  --frost: #F5F8F8;
  --graphite: #383D47;
  --graphite-soft: rgba(56, 61, 71, 0.64);
  --line: rgba(56, 61, 71, 0.14);
  --ion: #9FE3FF;
  --brass: #C59A45;
  --cyanotype: #2F5B88;
  --font: "Nunito", ui-rounded, "SF Pro Rounded", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

#unity-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  background: var(--paper);
  outline: none;
  /* Never let the page scroll or select under the game. */
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

/* ---------------------------------------------------------------- loader / title */

#ion-loader {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  align-items: safe center;
  justify-content: center;
  padding: 24px 16px;
  overflow-y: auto;
  /* The light table: Paper with a quiet 48 px contact-sheet grid. */
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 48px 48px,
    radial-gradient(120% 80% at 50% 0%, rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0) 60%),
    var(--paper);
  transition: opacity 400ms cubic-bezier(0.33, 1, 0.68, 1);
  cursor: default;
}
#ion-loader.ready { cursor: pointer; }
#ion-loader.done { opacity: 0; pointer-events: none; }
#ion-loader[hidden] { display: none; }

.ion-stack {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.ion-polaroid {
  margin: 0;
  width: 100%;
  background: var(--frost);
  padding: 14px 14px 0;
  border-radius: 4px;
  box-shadow: 0 1px 0 rgba(56, 61, 71, 0.08), 0 18px 40px -18px rgba(47, 91, 136, 0.45);
  transform: rotate(-1.5deg);
}

.ion-photo {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: 2px;
  background: linear-gradient(180deg, #8FB8E6 0%, #F3E1D6 58%, var(--limestone) 58%, #CBBFA9 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  /* An instant photo developing: starts dim and colourless, gains colour with the download (--p). */
  filter: saturate(calc(0.15 + 0.85 * var(--p, 0))) brightness(calc(0.82 + 0.18 * var(--p, 0))) sepia(calc(0.35 * (1 - var(--p, 0))));
  transition: filter 400ms ease-out;
}
/* Milky "undeveloped" veil that clears as loading progresses. */
.ion-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 50% 40%, rgba(245, 248, 248, 0.0), rgba(245, 248, 248, 0.6));
  opacity: calc(1 - var(--p, 0));
  transition: opacity 400ms ease-out;
  pointer-events: none;
}

/* Crop marks. */
.ion-corner { position: absolute; width: 18px; height: 18px; border: 2px solid var(--graphite); opacity: 0.55; }
.ion-corner.tl { top: 12px; left: 12px; border-right: 0; border-bottom: 0; }
.ion-corner.tr { top: 12px; right: 12px; border-left: 0; border-bottom: 0; }
.ion-corner.bl { bottom: 12px; left: 12px; border-right: 0; border-top: 0; }
.ion-corner.br { bottom: 12px; right: 12px; border-left: 0; border-top: 0; }

.ion-brand {
  margin: 0;
  font-size: clamp(30px, 9vw, 46px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--graphite);
}
.ion-brand .pipe { font-weight: 300; color: var(--cyanotype); opacity: 0.75; padding: 0 0.04em; }

.ion-strip {
  padding: 16px 4px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 92px;
}

.ion-bar {
  position: relative;
  height: 6px;
  border-radius: 999px;
  background: rgba(56, 61, 71, 0.1);
  overflow: hidden;
}
.ion-bar-fill {
  height: 100%;
  width: 100%;
  background: var(--graphite);
  border-radius: inherit;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 250ms ease-out;
}
/* A soft light sweep along the bar while loading. */
.ion-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  width: 35%;
  animation: ion-sweep 1.6s ease-in-out infinite;
  pointer-events: none;
}
@keyframes ion-sweep {
  from { transform: translateX(-100%); }
  to { transform: translateX(300%); }
}

.ion-status-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}
.ion-status {
  font-size: 14px;
  color: var(--graphite-soft);
}
.ion-pct {
  font-size: 14px;
  font-weight: 700;
  color: var(--graphite);
  font-variant-numeric: tabular-nums;
}

/* "Click to play": appears in place of the bar once the game has drawn its first frame. One click goes
   straight from here into the game (the pointer locks inside this click). */
.ion-play {
  display: none;
  align-self: center;
  margin: 2px 0 0;
  border: 0;
  border-radius: 10px;
  padding: 14px 30px 15px;
  background: var(--graphite);
  color: var(--paper);
  font: 800 20px/1 var(--font);
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: 0 10px 22px -12px rgba(47, 91, 136, 0.7);
  transition: transform 120ms cubic-bezier(0.5, 1, 0.89, 1), background-color 120ms ease-out;
}
.ion-play .br { color: var(--ion); font-weight: 400; }
.ion-play:hover { background: #2E323B; }
.ion-play:active { transform: scale(0.97); transition-duration: 80ms; }
.ion-play:focus-visible { outline: 2px solid var(--cyanotype); outline-offset: 3px; }
#ion-loader.ready .ion-play { display: inline-block; animation: ion-in 220ms cubic-bezier(0.33, 1, 0.68, 1) both; }
#ion-loader.ready .ion-bar,
#ion-loader.ready .ion-status-row { display: none; }
@keyframes ion-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------------- controls */

.ion-controls {
  width: 100%;
  background: rgba(245, 248, 248, 0.75);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px 12px;
}
.ion-controls h2 {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--graphite-soft);
}
.ion-controls dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 14px;
  row-gap: 6px;
  font-size: 14px;
  align-items: center;
}
.ion-controls dt { margin: 0; white-space: nowrap; color: var(--graphite-soft); font-size: 13px; }
.ion-controls dd { margin: 0; }
.ion-controls .note { margin: 8px 0 0; font-size: 12px; color: var(--graphite-soft); }

/* Key caps in the bracket style: [SHIFT]. */
kbd {
  display: inline-block;
  min-width: 1.7em;
  padding: 1px 6px;
  margin-right: 2px;
  border-radius: 4px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  background: var(--frost);
  color: var(--graphite);
  font: 700 12px/1.5 var(--font);
  text-align: center;
}

/* ---------------------------------------------------------------- links */

.ion-links a,
#ion-corner-link {
  color: var(--graphite);
  font-weight: 600;
  font-size: 15px;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.ion-links a:hover, #ion-corner-link:hover { text-decoration-thickness: 2px; }
.ion-links a:focus-visible, #ion-corner-link:focus-visible, .ion-notice button:focus-visible {
  outline: 2px solid var(--cyanotype);
  outline-offset: 3px;
  border-radius: 2px;
}

.ion-made {
  margin: 0;
  font-size: 12px;
  color: var(--graphite-soft);
}

#ion-corner-link {
  position: fixed;
  top: 14px;
  right: 16px;
  z-index: 5;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(239, 235, 227, 0.88);
  font-size: 13px;
  text-decoration: none;
}
#ion-corner-link[hidden] { display: none; }

/* ---------------------------------------------------------------- notices */

.ion-notice {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 16px;
  z-index: 20;
  margin: 0 auto;
  max-width: 520px;
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--graphite);
  color: var(--paper);
  font-size: 14px;
  line-height: 1.4;
}
.ion-notice[hidden] { display: none; }
.ion-notice button {
  flex: none;
  border: 0;
  border-radius: 6px;
  padding: 6px 12px;
  background: var(--paper);
  color: var(--graphite);
  font: 600 13px var(--font);
  cursor: pointer;
}

#ion-banner {
  position: fixed;
  top: 16px;
  left: 16px;
  right: 16px;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}
.ion-msg {
  max-width: 560px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  pointer-events: auto;
  background: var(--paper);
  color: var(--graphite);
  border: 1px solid var(--line);
}
.ion-msg.error { background: var(--graphite); color: var(--paper); }

@media (max-height: 640px) {
  .ion-photo { aspect-ratio: 16 / 7; }
}

@media (prefers-reduced-motion: reduce) {
  #ion-loader, .ion-bar-fill, .ion-photo, .ion-photo::after, .ion-play { transition: none; }
  .ion-bar::after { animation: none; display: none; }
  #ion-loader.ready .ion-play { animation: none; }
  .ion-polaroid { transform: none; }
}