/* Player chrome, generated controls and the full-screen study page shell.
   Requires tokens.css + base.css. State lives in attributes set by core/player.js:
   .player[data-state="idle|loading|ready|playing|paused|static|error"][data-drawn][data-want] */

/* --- Player ------------------------------------------------------------- */

.player { position: relative; }
.player__frame {
  position: relative;
  width: 100%;
  aspect-ratio: var(--ar, 2.39);
  overflow: hidden;
  background: var(--ink-0);
  contain: layout paint;
  /* Never transition (base.css gives every element a 0.01 ms transition under reduced motion, and
     Chromium interpolates aspect-ratio): the Player must measure the final size on its first frame. */
  transition-property: none;
}
.player--fill .player__frame { position: absolute; inset: 0; aspect-ratio: auto; height: 100%; }

.player__canvas,
.player__poster {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}
.player__poster {
  object-fit: cover;
  transition: opacity var(--dur-2) var(--ease-out);
}
/* Poster stays until the first frame is drawn, and returns on error / context loss. */
.player[data-drawn] .player__poster { opacity: 0; pointer-events: none; }
.player[data-state="error"] .player__poster { opacity: 1; }
.player[data-state="error"] .player__canvas { visibility: hidden; }

.player__fallback {
  position: absolute; left: var(--s4); bottom: var(--s4);
  margin: 0; display: none;
  font-family: var(--font-mono); font-size: var(--step--1);
  letter-spacing: var(--tracking-mono); color: var(--paper-2);
  padding: var(--s1) var(--s3); border-radius: var(--radius-1); background: rgb(7 8 10 / 0.72);   /* legible over a bright poster */
}
.player[data-state="error"] .player__fallback { display: block; }

/* Loading shimmer: a thin tungsten line, static under reduced motion. */
.player[data-state="loading"] .player__frame::after {
  content: "";
  position: absolute; left: 0; bottom: 0; height: 2px; width: 30%;
  background: var(--tungsten); opacity: 0.6;
  animation: player-load 1.2s var(--ease-io) infinite alternate;
}
@keyframes player-load { from { transform: translateX(0); } to { transform: translateX(233%); } }

/* Chrome: Resume demo + play/pause, bottom-right (pieces keep camera-report text bottom-left), 44 px targets. */
.player__chrome {
  position: absolute; right: var(--s3); bottom: var(--s3);
  flex-direction: row-reverse;
  z-index: var(--z-player-chrome);
  display: flex; gap: var(--s2); align-items: center;
}
.player__btn {
  min-width: var(--target); min-height: var(--target);
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s2);
  padding: 0 var(--s3);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: rgb(7 8 10 / 0.72);
  color: var(--paper);
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: var(--tracking-mono); text-transform: uppercase;
  backdrop-filter: blur(6px);
  transition: border-color var(--dur-1), background-color var(--dur-1);
}
.player__btn:hover { border-color: var(--tungsten); }
.player__btn[hidden] { display: none; }
.player__toggle { padding: 0; width: var(--target); }

/* Icon: two bars (pause) while playing is wanted, a triangle (play) otherwise. */
.player__icon { position: relative; width: 12px; height: 12px; }
.player[data-want="play"] .player__icon::before,
.player[data-want="play"] .player__icon::after {
  content: ""; position: absolute; top: 0; width: 4px; height: 12px; background: currentColor;
}
.player[data-want="play"] .player__icon::before { left: 1px; }
.player[data-want="play"] .player__icon::after { right: 1px; }
.player[data-want="pause"] .player__icon::before {
  content: ""; position: absolute; left: 2px; top: 0;
  border-left: 10px solid currentColor;
  border-top: 6px solid transparent; border-bottom: 6px solid transparent;
}

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

.controls { display: grid; gap: var(--s5); }
.controls__group {
  margin: 0; padding: 0; border: 0;
  display: grid; gap: var(--s4);
}
.controls__legend, .controls__label {
  padding: 0;
  font-family: var(--font-mono); font-size: var(--step--1);
  letter-spacing: var(--tracking-mono); text-transform: uppercase;
  color: var(--paper-3);
}
.controls__legend { margin-bottom: var(--s2); color: var(--paper-2); }
.controls__item { display: grid; gap: var(--s2); margin: 0; padding: 0; border: 0; min-width: 0; }
.controls__row { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s3); }
.controls__value {
  font-family: var(--font-mono); font-size: var(--step--1);
  color: var(--paper); font-variant-numeric: tabular-nums;
}
.controls__hint { font-size: var(--step--1); color: var(--paper-3); }

/* Range: 44 px hit area, hairline track filled in tungsten up to --fill. */
.controls__range {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: var(--target); margin: 0;
  background: transparent; cursor: pointer;
}
.controls__range::-webkit-slider-runnable-track {
  height: 2px;
  background: linear-gradient(90deg, var(--tungsten) var(--fill, 0%), var(--line-strong) var(--fill, 0%));
}
.controls__range::-moz-range-track { height: 2px; background: var(--line-strong); }
.controls__range::-moz-range-progress { height: 2px; background: var(--tungsten); }
.controls__range::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; margin-top: -7px;
  border-radius: 50%; background: var(--paper); border: 2px solid var(--ink-1);
}
.controls__range::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%; background: var(--paper); border: 2px solid var(--ink-1);
}
.controls__range:focus-visible { outline-offset: 0; }

.controls__radios { display: flex; flex-wrap: wrap; gap: var(--s2); }
.controls__radios > legend { width: 100%; margin-bottom: var(--s2); }
.controls__radio { position: relative; display: inline-flex; }
.controls__radio input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.controls__radio span {
  min-width: var(--target); min-height: var(--target);
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0 var(--s3);
  border: 1px solid var(--line-strong); border-radius: var(--radius-2);
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--paper-2);
}
.controls__radio input:checked + span { border-color: var(--tungsten); color: var(--paper); background: var(--ink-3); }
.controls__radio input:focus-visible + span { outline: var(--focus-ring); outline-offset: 2px; }

.controls__select {
  min-height: var(--target); padding: 0 var(--s3);
  background: var(--ink-2); border: 1px solid var(--line-strong); border-radius: var(--radius-2);
}
.controls__item--toggle { grid-template-columns: auto 1fr; align-items: center; min-height: var(--target); }
/* A toggle's hint takes its own full-width row, so the checkbox column stays narrow. */
.controls__item--toggle .controls__hint { grid-column: 1 / -1; }
.controls__check { width: 24px; height: 24px; margin: 0 var(--s2) 0 0; accent-color: var(--tungsten); }

@media (forced-colors: active) {
  .controls__range::-webkit-slider-runnable-track { background: CanvasText; }
  .controls__radio input:checked + span { border: 2px solid Highlight; }
}

/* --- Study page (studies/*.html, normal mode) ------------------------------ */

.study__bar {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s4);
  min-height: 56px; padding: var(--s2) var(--gutter);
  border-bottom: var(--hairline);
}
.study__home { display: inline-flex; align-items: center; min-height: var(--target); font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: var(--tracking-mono); text-transform: uppercase; text-decoration: none; }
.study__motion {
  min-height: var(--target); padding: 0 var(--s4);
  border: 1px solid var(--line-strong); border-radius: var(--radius-pill);
  background: transparent; white-space: nowrap;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: var(--tracking-mono); text-transform: uppercase;
}
.study__motion[aria-pressed="true"] { border-color: var(--tungsten); color: var(--tungsten); }
/* Contact, one click away from a study too: a pill like the Motion toggle beside it (as the site header's). */
.study__contact {
  margin-left: auto; display: inline-flex; align-items: center; min-height: var(--target); padding: 0 var(--s4);
  border: 1px solid var(--line-strong); border-radius: var(--radius-pill);
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: var(--tracking-mono); text-transform: uppercase;
  color: var(--paper); text-decoration: none; white-space: nowrap;
  transition: border-color var(--dur-2) var(--ease-ui);
}
.study__contact:hover { border-color: var(--tungsten); }
/* Phones: the name breaks onto two lines before a pill does; under 360 px it takes a line of its own. */
@media (max-width: 479px) {
  .study__bar { gap: var(--s2); }
  .study__contact, .study__motion { padding-inline: var(--s3); }
}
@media (max-width: 359px) {
  .study__bar { flex-wrap: wrap; }
  .study__home { flex-basis: 100%; }
}

.study__main { padding: var(--s6) var(--gutter) var(--s8); }
.study__head { display: grid; gap: var(--s2); margin-bottom: var(--s5); }
.study__title { font-size: var(--step-4); }
.study__layout { display: grid; gap: var(--s6); align-items: start; }
.study__panel { min-width: 0; }
.study__credits { margin-top: var(--s5); max-width: var(--measure); }
.study__disclosure { margin-top: var(--s3); }
.study__disclosure a { color: inherit; }

@media (min-width: 1024px) {
  .study__layout { grid-template-columns: minmax(0, 8fr) minmax(280px, 4fr); }
  .study__panel { position: sticky; top: var(--s5); }
}

/* --- Record mode: only the bare canvas. ------------------------------------ */

.is-record, .is-record body { margin: 0; padding: 0; background: #000; overflow: hidden; }
.is-record body::after { display: none; }
.stage-record { display: block; }