/* =============================================================
   CoMPhy Lab talks: player and site shell.
   Builds on site/vendor/ds/tokens.css; never redefines its tokens.
   ============================================================= */

:root {
  --gutter: clamp(12px, 2.4vw, 32px);
  --header-h: 56px;
  --head-h: 96px;
  --controls-h: 48px;
  --progress-h: 3px;
  --viewer-gap: 10px;
  --app-maxw: 1760px;
}

/* Page content sits above the design system's fixed grid overlay. */
.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

:focus-visible {
  outline: 3px solid var(--c-accent-teal);
  outline-offset: 2px;
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: var(--s-2);
  left: var(--s-2);
  z-index: 100;
  padding: var(--s-2) var(--s-4);
  border-radius: var(--r-pill);
  background: var(--c-accent-teal);
  color: var(--c-accent-teal-fg);
  border-bottom: 0;
  font-weight: var(--t-weight-semi);
  transform: translateY(-200%);
}

.skip-link:focus,
.skip-link:hover {
  transform: none;
  color: var(--c-accent-teal-fg);
}

/* ---------- Header ---------- */

.site-header {
  height: var(--header-h);
  background: var(--glass-header);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header__inner {
  width: min(100% - 2 * var(--gutter), var(--app-maxw));
  height: 100%;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
}

.site-header__tools {
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s-3);
  color: var(--fg-strong);
  border-bottom: 0;
  white-space: nowrap;
}

.brand:hover {
  color: var(--c-accent-teal);
}

.brand__lab {
  font-family: var(--t-display);
  font-style: italic;
  font-weight: var(--t-weight-med);
  font-size: 23px; /* between --t-h3 and --t-h2; no type token matches the wordmark */
  letter-spacing: -0.005em;
}

.brand__section {
  font-size: var(--t-eyebrow);
  font-weight: var(--t-weight-semi);
  letter-spacing: var(--t-track-wide);
  text-transform: uppercase;
  color: var(--fg-2);
}

.site-header__link {
  font-size: var(--t-small);
  font-weight: var(--t-weight-med);
  color: var(--fg-1);
  border-bottom: 0;
  padding: var(--s-2) var(--s-3);
  border-radius: var(--r-xs);
}

.site-header__link:hover {
  color: var(--c-accent-teal);
  background: color-mix(in srgb, var(--c-accent-teal) 10%, transparent);
}

/* ---------- Talk page: title, stage and controls fill one viewport ---------- */

.talk-app {
  width: min(100% - 2 * var(--gutter), var(--app-maxw));
  margin-inline: auto;
  height: calc(100vh - var(--header-h));
  height: calc(100dvh - var(--header-h));
  min-height: 380px;
  padding-block: var(--s-2) var(--s-4);
  display: grid;
  grid-template-rows: minmax(0, 1fr);
}

.viewer {
  min-height: 0;
  container-type: size;
  display: grid;
  place-items: center;
  outline: none;
}

/* Heading, stage, progress and controls share one column, as wide as the
   largest 16:9 stage that fits beside the reserved heading and controls. */
.viewer__col {
  width: min(100cqw, calc((100cqh - var(--head-h) - var(--controls-h) - var(--progress-h) - 2 * var(--viewer-gap)) * 16 / 9));
  min-width: 0;
}

.talk-head {
  height: var(--head-h);
  display: grid;
  align-content: end;
  gap: 2px;
  min-width: 0;
  padding-bottom: var(--s-3);
}

.talk-head > * {
  margin: 0;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.talk-head__title {
  font-size: clamp(22px, 2.3vw, 30px);
  line-height: 1.2;
}

.talk-head__subtitle {
  color: var(--fg-2);
  font-size: var(--t-body);
  line-height: 1.4;
}

/* ---------- Stage ---------- */

.stage-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  container-type: size;
  display: grid;
  place-items: center;
  cursor: pointer;
  touch-action: pan-y pinch-zoom;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.stage-frame.is-loading {
  cursor: progress;
}

.stage-box {
  position: relative;
  width: min(100cqw, calc(100cqh * 16 / 9));
  height: min(100cqh, calc(100cqw * 9 / 16));
  overflow: hidden;
  isolation: isolate;
  /* The slide itself: Keynote's white background, not paper. */
  background: #fff;
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-soft);
  outline: 1px solid var(--c-border);
  container-type: inline-size;
}

.stage,
.layer,
.stage-ui {
  position: absolute;
  inset: 0;
}

.layer--image {
  z-index: 1;
}

.layer--media {
  z-index: 2;
}

.layer--overlay {
  z-index: 3;
  pointer-events: none;
}

.stage-ui {
  z-index: 4;
  pointer-events: none;
}

.stage-ui > * {
  pointer-events: auto;
}

.still {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: fill;
  pointer-events: none;
}

.still.is-broken {
  visibility: hidden;
}

.media {
  position: absolute;
  display: block;
  margin: 0;
  padding: 0;
  border: 0;
}

.media--video {
  object-fit: fill;
  background: transparent;
  pointer-events: none;
}

/* A failed video reveals the poster frame baked into the still beneath. */
.media--video.is-failed {
  visibility: hidden;
}

.media--youtube {
  background: #000;
}

.media--youtube > iframe,
.media__slot {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.media--youtube.is-fallback {
  background: transparent;
}

/* Dissolve: CSS opacity, 0.5 s. */
.fade {
  transition: opacity 0.5s ease-in-out;
}

.is-transparent {
  opacity: 0;
}

/* ---------- YouTube fallback (UI layer, above the overlay) ---------- */

.yt-fallback {
  position: absolute;
  display: grid;
  place-items: end start;
  overflow: hidden;
  background: #111;
  color: #fff;
  border-bottom: 0;
  font-size: clamp(11px, 1.5cqw, 26px);
  line-height: 1.35;
  text-decoration: none;
}

.yt-fallback:hover {
  color: #fff;
}

.yt-fallback__thumb {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}

.yt-fallback__body {
  position: relative;
  display: grid;
  gap: 0.25em;
  padding: 1em 1.2em;
}

.yt-fallback__label {
  justify-self: start;
  padding: 0.35em 0.9em;
  border-radius: var(--r-pill);
  background: var(--c-accent-teal);
  color: var(--c-accent-teal-fg);
  font-weight: var(--t-weight-semi);
}

.yt-fallback:hover .yt-fallback__label {
  background: var(--c-accent-teal-hover);
}

.yt-fallback__title {
  font-weight: var(--t-weight-semi);
}

.yt-fallback__credit {
  font-size: 0.8em;
  opacity: 0.85;
}

.stage-error {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: var(--s-2);
  padding: var(--s-5);
  text-align: center;
  background: var(--c-surface-strong);
  color: var(--fg-1);
  cursor: default;
}

.stage-error p {
  margin: 0;
}

.stage-error__title {
  font-family: var(--t-serif);
  font-size: var(--t-h3);
  font-weight: var(--t-weight-semi);
  color: var(--fg-strong);
}

.stage-error__detail {
  color: var(--fg-2);
  font-size: var(--t-small);
}

/* ---------- Progress and controls ---------- */

.progress {
  height: var(--progress-h);
  margin-top: var(--viewer-gap);
  border-radius: var(--r-pill);
  background: var(--c-border);
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  background: var(--c-accent-teal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.controls {
  min-height: var(--controls-h);
  margin-top: var(--viewer-gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
}

.controls__nav {
  flex: none;
  display: flex;
  align-items: center;
  gap: var(--s-2);
}

.controls__tools {
  flex: none;
  display: flex;
  align-items: center;
  gap: var(--s-2);
}

.ctl {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--c-border-strong);
  border-radius: var(--r-pill);
  background: var(--c-surface-strong);
  color: var(--fg-1);
  font: inherit;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.ctl:hover {
  color: var(--c-accent-teal);
  border-color: var(--c-accent-teal);
  background: color-mix(in srgb, var(--c-accent-teal) 8%, var(--c-surface-strong));
}

.ctl--primary {
  background: var(--c-accent-teal);
  border-color: var(--c-accent-teal);
  color: var(--c-accent-teal-fg);
}

.ctl--primary:hover {
  background: var(--c-accent-teal-hover);
  border-color: var(--c-accent-teal-hover);
  color: var(--c-accent-teal-fg);
}

.ctl[aria-disabled="true"] {
  opacity: 0.4;
  cursor: default;
}

.ctl[aria-disabled="true"]:hover {
  color: var(--fg-1);
  border-color: var(--c-border-strong);
  background: var(--c-surface-strong);
}

.ctl--primary[aria-disabled="true"]:hover {
  background: var(--c-accent-teal);
  border-color: var(--c-accent-teal);
  color: var(--c-accent-teal-fg);
}

.ctl__icon {
  width: 20px;
  height: 20px;
  pointer-events: none;
}

.ctl__icon--play,
.ctl[data-paused="true"] .ctl__icon--pause,
.ctl__icon--exit-fs,
.ctl[data-active="true"] .ctl__icon--enter-fs,
.ctl__icon--sun,
:root[data-theme="dark"] .ctl__icon--moon {
  display: none;
}

.ctl[data-paused="true"] .ctl__icon--play,
.ctl[data-active="true"] .ctl__icon--exit-fs,
:root[data-theme="dark"] .ctl__icon--sun {
  display: block;
}

.counter {
  flex: none;
  margin: 0 var(--s-1);
  min-width: 4.5em;
  text-align: center;
  font-size: var(--t-small);
  font-weight: var(--t-weight-semi);
  font-variant-numeric: tabular-nums;
  color: var(--fg-strong);
  white-space: nowrap;
}

.counter__title {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--t-small);
  color: var(--fg-2);
}

/* ---------- Full screen: only the stage, on black ---------- */

.stage-frame:fullscreen {
  width: 100vw;
  height: 100vh;
  aspect-ratio: auto;
  background: #000;
  cursor: default;
}

.stage-frame:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
  aspect-ratio: auto;
  background: #000;
  cursor: default;
}

.stage-frame::backdrop {
  background: #000;
}

.stage-frame:fullscreen .stage-box {
  border-radius: 0;
  box-shadow: none;
  outline: 0;
}

.stage-frame:-webkit-full-screen .stage-box {
  border-radius: 0;
  box-shadow: none;
  outline: 0;
}

/* Fallback where element full screen is unavailable (iPhone Safari). */
:root.is-pseudo-fullscreen,
:root.is-pseudo-fullscreen body {
  overflow: hidden;
}

:root.is-pseudo-fullscreen .stage-frame {
  position: fixed;
  inset: 0;
  z-index: 1000;
  width: auto;
  height: auto;
  aspect-ratio: auto;
  background: #000;
}

:root.is-pseudo-fullscreen .stage-box {
  border-radius: 0;
  box-shadow: none;
  outline: 0;
}

/*
 * Full-screen controls. The page's control bar is hidden behind a full-screen
 * stage, so without a keyboard (phones and tablets) these are the only way to
 * pause the media (WCAG 2.2.2) or leave full screen. They sit in the top
 * right corner, which is letterbox or pillarbox black unless the screen is
 * exactly 16:9.
 */
.stage-tools {
  display: none;
}

:root.is-pseudo-fullscreen .stage-tools {
  position: absolute;
  top: max(12px, env(safe-area-inset-top));
  right: max(12px, env(safe-area-inset-right));
  z-index: 5;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  cursor: default;
}

@media (hover: none) {
  .stage-frame:fullscreen .stage-tools {
    position: absolute;
    top: max(12px, env(safe-area-inset-top));
    right: max(12px, env(safe-area-inset-right));
    z-index: 5;
    display: flex;
    flex-direction: column;
    gap: var(--s-2);
    cursor: default;
  }
}

@media (hover: none) {
  .stage-frame:-webkit-full-screen .stage-tools {
    position: absolute;
    top: max(12px, env(safe-area-inset-top));
    right: max(12px, env(safe-area-inset-right));
    z-index: 5;
    display: flex;
    flex-direction: column;
    gap: var(--s-2);
    cursor: default;
  }
}

.ctl--onblack {
  border-color: rgb(255 255 255 / 0.35);
  background: rgb(20 20 20 / 0.75);
  color: #fff;
}

.ctl--onblack:hover {
  border-color: var(--c-accent-teal);
  background: rgb(20 20 20 / 0.9);
  color: #fff;
}

/* On the black full-screen backdrop the light-theme teal ring alone reaches
   only 2.2:1. A light ring inside it keeps the focus indicator well above
   3:1 (WCAG 1.4.11) in both themes, and the ring stays teal. */
.ctl--onblack:focus-visible {
  outline-offset: 4px;
  box-shadow: 0 0 0 4px var(--c-surface-strong);
}

/* ---------- About panel ---------- */

.about {
  width: min(100% - 2 * var(--gutter), var(--maxw-page));
  margin: var(--s-7) auto 0;
}

.about__panel {
  display: grid;
  gap: var(--s-3);
}

.about__panel .lede {
  margin: 0;
}

.about__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: var(--s-4);
  margin-top: var(--s-3);
}

.about__grid h3 {
  margin-bottom: var(--s-3);
}

.keys {
  display: grid;
  gap: var(--s-2);
  margin: 0;
}

.keys > div {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: var(--s-3);
  align-items: baseline;
}

.keys dt {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.keys dd {
  margin: 0;
  color: var(--fg-2);
  font-size: var(--t-small);
}

kbd {
  font-family: var(--t-mono);
  font-size: var(--t-eyebrow);
  line-height: 1.6;
  padding: 1px 7px;
  border: 1px solid var(--c-border-strong);
  border-radius: var(--r-xs);
  background: color-mix(in srgb, var(--fg-strong) 5%, transparent);
  color: var(--fg-1);
}

.about__hint,
.about__updated,
.about__credits {
  margin: var(--s-3) 0 0;
  color: var(--fg-2);
  font-size: var(--t-small);
}

.about__updated {
  margin-top: 0;
}

.changelog {
  list-style: none;
  margin: var(--s-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s-2);
}

.changelog li {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--s-3);
  font-size: var(--t-small);
}

.changelog time {
  color: var(--fg-2);
  font-variant-numeric: tabular-nums;
}

/* ---------- Footer ---------- */

.site-footer {
  width: min(100% - 2 * var(--gutter), var(--maxw-page));
  margin: var(--s-7) auto 0;
  padding: var(--s-5) 0 var(--s-6);
  border-top: 1px solid var(--c-border);
  color: var(--fg-2);
  font-size: var(--t-small);
}

.site-footer p {
  margin: 0;
}

/* :root raises specificity over the tokens' dark-theme prose-link colour:
   teal is the only interactive accent. */
:root .site-footer a,
:root .about a {
  color: var(--c-accent-teal);
  border-bottom-color: color-mix(in srgb, var(--c-accent-teal) 35%, transparent);
}

/* ---------- Talks index ---------- */

.index {
  width: min(100% - 2 * var(--gutter), var(--maxw-page));
  margin-inline: auto;
}

.index-hero {
  padding: var(--s-8) 0 var(--s-6);
  display: grid;
  gap: var(--s-3);
}

/* Shrink to the word so the hero gradient spans the type, not the page. */
.index-hero .hero-title {
  justify-self: start;
  padding-right: 0.08em;
}

.index-hero .lede {
  margin: 0;
}

.talk-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr));
  gap: var(--s-5);
}

.talk-card {
  position: relative;
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
  background: var(--c-surface-strong);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.talk-card:hover,
.talk-card:focus-within {
  border-color: var(--c-accent-teal);
  box-shadow: var(--shadow-md);
}

.talk-card:hover {
  transform: translateY(-1px);
}

.talk-card__cover {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #fff;
  border-bottom: 1px solid var(--c-border);
}

.talk-card__body {
  display: grid;
  align-content: start;
  gap: var(--s-2);
  padding: var(--s-5);
}

.talk-card__title {
  font-size: var(--t-h3);
}

.talk-card__link {
  color: var(--fg-strong);
  border-bottom: 0;
}

.talk-card__link:hover {
  color: var(--c-accent-teal);
}

/* The whole card is the link's hit area; focus shows on the card. */
.talk-card__link::after {
  content: "";
  position: absolute;
  inset: 0;
}

.talk-card__link:focus-visible {
  outline: none;
}

.talk-card:focus-within {
  outline: 3px solid var(--c-accent-teal);
  outline-offset: 2px;
}

.talk-card__subtitle {
  margin: 0;
  color: var(--fg-1);
  line-height: 1.5;
}

.talk-card__meta {
  margin: var(--s-2) 0 0;
  color: var(--fg-2);
  font-size: var(--t-small);
}

.talk-list__status {
  color: var(--fg-2);
}

.talk-list__status:empty {
  display: none;
}

/* ---------- Narrow and portrait screens: stage fits the width ---------- */

@media (orientation: portrait), (max-width: 699px) {
  .talk-app {
    height: auto;
    min-height: 0;
  }

  .viewer {
    container-type: inline-size;
  }

  .viewer__col {
    width: 100%;
  }

  .talk-head {
    height: auto;
    padding-top: var(--s-2);
  }

  .talk-head > * {
    white-space: normal;
  }
}

@media (max-width: 699px) {
  :root {
    --header-h: 52px;
    --viewer-gap: 8px;
  }

  .site-header__link {
    display: none;
  }

  .stage-box {
    border-radius: var(--r-xs);
  }

  .controls {
    flex-wrap: wrap;
    gap: var(--s-2);
  }

  /* The slide title takes its own row below the buttons. */
  .counter__title {
    order: 3;
    flex-basis: 100%;
    white-space: normal;
    overflow: visible;
  }
}

/* Short landscape screens (phones on their side): give the stage the room. */
@media (orientation: landscape) and (max-height: 520px) {
  :root {
    --header-h: 44px;
    --head-h: 0px;
    --controls-h: 44px;
    --viewer-gap: 6px;
  }

  .talk-app {
    min-height: 0;
    padding-block: var(--s-2);
  }

  .talk-head {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .fade,
  .progress__bar,
  .ctl,
  .talk-card {
    transition: none !important;
  }

  .talk-card:hover {
    transform: none;
  }
}