/* player.css — the per-episode page (header, audio player, language toggle,
   bilingual transcript). Mobile-first at 375px, enhanced up. References
   tokens.css only — no new colors or fonts. */

/* ---------------------------- Episode header ---------------------------- */
.ep-head {
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-6) 0 var(--space-6);
  border-bottom: var(--hairline);
  text-align: center;
}

.ep-head__back {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.ep-head__back:hover {
  color: var(--accent);
  text-decoration: none;
}

.ep-head__back-arrow {
  color: var(--accent);
}

.ep-head__no {
  margin-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.2em;
  color: var(--accent);
}

.ep-head__title {
  margin-top: var(--space-3);
  font-weight: 400;
}

.ep-head__title-zh {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--step-3);
  line-height: 1.2;
  color: var(--ink);
}

.ep-head__title-en {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--step-2);
  line-height: 1.25;
  color: var(--muted);
}

.ep-head__meta {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.ep-head__guest [lang="zh-Hans"] {
  color: var(--accent);
  margin-right: 0.35em;
}

.ep-head__dot {
  color: var(--rule);
}

/* ------------------------------ Episode body ---------------------------- */
.episode {
  max-width: var(--measure);
  margin: 0 auto;
}

/* -------------------------------- Player -------------------------------- */
.player {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-5);
  background: var(--paper);
  border: var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Native fallback (no JS): give the bare <audio controls> room to breathe. */
.player__audio {
  width: 100%;
  display: block;
}

/* No-JS flash guard. The inline head script swaps html.no-js -> html.js before
   first paint, so when JS is on we hide the native <audio controls> from the
   very first frame — no flash of the browser player before player.js swaps in
   the custom UI. With JS OFF, html stays .no-js, the native controls stay
   visible, and the custom UI stays hidden: full progressive-enhancement
   fallback. (player.js still calls removeAttribute('controls') too.) */
.js .player__audio {
  display: none;
}

/* Custom UI layout. IMPORTANT: `display` is gated on .js. A bare
   `.player__ui { display:flex }` would override the element's `hidden`
   attribute (author display beats the UA `[hidden]{display:none}` rule), so a
   no-JS visitor would see a dead, non-wired custom UI on top of the native
   controls. Gating display on .js keeps the custom UI hidden until JS is live —
   then it shows instantly (static 00:00 markup) and player.js wires it. */
.player__ui {
  align-items: center;
  gap: var(--space-4);
}

.js .player__ui {
  display: flex;
}

.player__btn {
  appearance: none;
  border: var(--hairline);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  font-family: var(--font-mono);
}

.player__btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

@media (prefers-reduced-motion: no-preference) {
  .player__btn {
    transition: border-color 140ms ease, color 140ms ease, background 140ms ease;
  }
}

/* Play / pause — circular, ink-teal filled, the one strong accent. */
.player__play {
  flex: none;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border-color: var(--accent);
  background: var(--accent);
  color: var(--paper);
  display: grid;
  place-items: center;
}

.player__play:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.player__play .icon {
  width: 1.35rem;
  height: 1.35rem;
  fill: currentColor;
}

/* Toggle icon by play state (root gets .is-playing from player.js). */
.player__play .icon--pause {
  display: none;
}

.player.is-playing .player__play .icon--play {
  display: none;
}

.player.is-playing .player__play .icon--pause {
  display: block;
}

/* Seek track. */
.player__track {
  flex: 1;
  display: flex;
  align-items: center;
  min-width: 0;
}

.player__seek {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 999px;
  background: var(--rule);
  cursor: pointer;
  margin: 0;
}

.player__seek::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 999px;
  background: transparent;
}

.player__seek::-moz-range-track {
  height: 4px;
  border-radius: 999px;
  background: var(--rule);
}

.player__seek::-moz-range-progress {
  height: 4px;
  border-radius: 999px;
  background: var(--accent);
}

.player__seek::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
}

.player__seek::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
}

.player__seek:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* Times. */
.player__time {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.player__elapsed {
  color: var(--ink);
}

.player__time-sep {
  margin: 0 0.35em;
  color: var(--rule);
}

/* Speed. */
.player__speed {
  flex: none;
  min-width: 3.25rem;
  padding: 0.4rem 0.5rem;
  border-radius: 999px;
  font-size: var(--step-mono);
  letter-spacing: 0.04em;
}

/* Narrow screens: keep controls on one calm row, let times wrap under. */
@media (max-width: 26rem) {
  .player__ui {
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .player__track {
    order: 3;
    flex-basis: 100%;
  }
}

/* ============================== Chapter markers =========================
   A NEW overlay on top of the seek bar (chapters.js). Markers live in a
   pointer-events:none lane ABOVE the rail so they never obstruct drag-seek; the
   marker buttons re-enable pointer events for click/keyboard. Nothing here
   changes the frozen player.js / sync.js behaviour. */

/* Current-chapter label, above the player. */
.chapter-now {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  margin: 0 0 var(--space-3);
}

.chapter-now[hidden] {
  display: none;
}

.chapter-now__kicker {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.chapter-now__kicker [lang="zh-Hans"] {
  letter-spacing: 0.1em;
  color: var(--accent);
}

.chapter-now__sep {
  color: var(--rule);
}

.chapter-now__title {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5em;
}

.chapter-now__zh {
  font-size: var(--step-1);
  color: var(--ink);
}

.chapter-now__en {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--step-0);
  color: var(--muted);
}

/* The lane. padding-top on the track opens ~14px above the rail for ticks. */
.player--chapters .player__track {
  position: relative;
  padding-top: 14px;
}

.chapter-markers {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 14px;
  pointer-events: none; /* rail below always receives drag */
}

/* Each marker: a small transparent hit target holding a thin tick, in the lane
   above the rail. translateX(-50%) centers it on its % position. */
.chapter-marker {
  position: absolute;
  bottom: 0;
  transform: translateX(-50%);
  width: 18px;
  height: 14px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  pointer-events: auto;
  opacity: 0; /* revealed once positioned (avoids a pile at 0%) */
}

.chapter-markers[data-ready] .chapter-marker {
  opacity: 1;
}

.chapter-marker::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 2px;
  height: 9px;
  border-radius: 1px;
  background: var(--muted);
}

.chapter-marker:hover::before {
  background: var(--accent);
}

.chapter-marker.is-current::before {
  height: 12px;
  background: var(--accent);
}

.chapter-marker:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  .chapter-marker::before {
    transition: background 140ms ease, height 140ms ease;
  }
}

/* Optional collapsed chapter list below the player. */
.chapters {
  margin: 0 0 var(--space-6);
  background: var(--paper);
  border: var(--hairline);
  border-radius: var(--radius);
}

.chapters[hidden] {
  display: none;
}

.chapters__summary {
  display: flex;
  align-items: baseline;
  gap: 0.5em;
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.chapters__summary::-webkit-details-marker {
  display: none;
}

.chapters__summary [lang="zh-Hans"] {
  letter-spacing: 0.1em;
  color: var(--accent);
}

.chapters__summary-sep {
  color: var(--rule);
}

.chapters__summary::after {
  content: "▾";
  margin-left: auto;
  color: var(--muted);
}

.chapters[open] .chapters__summary::after {
  content: "▴";
}

.chapters__list {
  list-style: none;
  margin: 0;
  padding: 0 0 var(--space-2);
  border-top: var(--hairline);
}

.chapters__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  text-align: left;
  background: transparent;
  border: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.chapters__link:hover {
  background: var(--bg);
}

.chapters__num {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.chapters__title {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.chapters__title-zh {
  font-size: var(--step-0);
  color: var(--ink);
}

.chapters__title-en {
  font-size: var(--step-mono);
  color: var(--muted);
}

.chapters__time {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.chapters__link.is-current .chapters__num,
.chapters__link.is-current .chapters__title-zh,
.chapters__link.is-current .chapters__time {
  color: var(--accent);
}

.chapters__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

/* ---------------------------- Language toggle --------------------------- */
.lang-toggle {
  display: inline-flex;
  gap: 2px;
  margin: 0 0 var(--space-6);
  padding: 3px;
  background: var(--paper);
  border: var(--hairline);
  border-radius: 999px;
}

.lang-toggle__btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.08em;
  line-height: 1;
}

.lang-toggle__btn:hover {
  color: var(--accent);
}

.lang-toggle__btn[aria-pressed='true'] {
  background: var(--accent);
  color: var(--paper);
}

@media (prefers-reduced-motion: no-preference) {
  .lang-toggle__btn {
    transition: background 140ms ease, color 140ms ease;
  }
}

/* ------------------------------- Transcript ----------------------------- */
.transcript {
  margin-bottom: var(--space-9);
}

.turn {
  padding: var(--space-5) 0;
  border-top: var(--hairline);
}

.turn:first-child {
  border-top: none;
  padding-top: 0;
}

.turn__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-4);
  margin-bottom: var(--space-3);
}

.turn__chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.turn__role {
  color: var(--accent);
  letter-spacing: 0.1em;
}

.turn__name {
  color: var(--ink);
}

/* Subtle distinction between host and guest turns. */
.turn[data-speaker='g'] .turn__role {
  color: var(--muted);
}

.turn__time {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.04em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.turn__body {
  display: grid;
  gap: var(--space-4);
}

/* Sentence pair — Chinese primary, English secondary, stacked. */
.sentence {
  margin: 0;
}

.sen-zh {
  display: block;
  font-size: var(--step-1);
  line-height: 1.9;
  color: var(--ink);
}

.sen-en {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--muted);
}

/* Language modes — pure CSS, keyed off the container's data-lang. */
.transcript[data-lang='en'] .sen-zh {
  display: none;
}

.transcript[data-lang='en'] .sen-en {
  margin-top: 0;
  font-size: var(--step-1);
  line-height: 1.85;
  color: var(--ink);
}

.transcript[data-lang='zh'] .sen-en {
  display: none;
}

/* ------------------------------- Footer --------------------------------- */
.ep-foot {
  max-width: var(--measure);
  margin: 0 auto;
  border-top: var(--hairline);
  padding: var(--space-6) 0 var(--space-8);
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.ep-foot__back [lang='en'] {
  display: block;
  margin-top: var(--space-1);
  color: var(--muted);
}

.ep-foot__back:hover {
  text-decoration: none;
  color: var(--accent);
}

/* ------------------------ Live sync (Phase 4) --------------------------- */
/* Interactive affordance for tap-to-seek — only when JS wires it up. */
.transcript.is-synced .sentence {
  cursor: pointer;
  /* Quiet marker gutter: reserve room so the active bar doesn't shift text. */
  padding-left: var(--space-4);
  margin-left: calc(-1 * var(--space-4));
  border-left: 2px solid transparent;
  border-radius: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  .transcript.is-synced .sentence {
    transition: border-color 200ms ease, background 200ms ease;
  }
}

.transcript.is-synced .sentence:hover {
  border-left-color: var(--rule);
}

.transcript.is-synced .sentence:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Active sentence — calm editorial emphasis, NOT a loud background block:
   an ink-teal left marker + full-ink text on the pair. */
.sentence.is-active {
  border-left-color: var(--accent);
}

.sentence.is-active .sen-zh,
.sentence.is-active .sen-en {
  color: var(--ink);
}

/* --------------------------- "Back to current" pill --------------------- */
.follow-pill {
  position: fixed;
  left: 50%;
  bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 0.5rem);
  z-index: 20;

  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: var(--paper);
  box-shadow: var(--shadow);
  cursor: pointer;

  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.06em;
  line-height: 1;

  /* Hidden by default; revealed by sync.js adding .is-visible. */
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.follow-pill.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

@media (prefers-reduced-motion: no-preference) {
  .follow-pill {
    transition: opacity 180ms ease, transform 180ms ease, background 140ms ease;
  }
}

.follow-pill:hover {
  background: var(--ink);
  border-color: var(--ink);
}

.follow-pill:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.follow-pill__icon {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.follow-pill__sep {
  margin: 0 0.15em;
  opacity: 0.6;
}

/* -------------------------------- Enhance ------------------------------- */
@media (min-width: 40rem) {
  .ep-head {
    padding: var(--space-8) 0 var(--space-7);
  }

  .player {
    padding: var(--space-5) var(--space-6);
  }

  .turn__body {
    gap: var(--space-5);
  }
}

/* Parallel bilingual transcript on wide screens. In 双语 (both) mode only, lay
   each sentence out as two columns — 中文 left, English right. Phones (<48rem)
   keep the stacked layout. The grid lives on `.sentence`, so the .is-active left
   marker and tap-to-seek (both keyed off `.sentence`) keep working unchanged.
   English-only and Chinese-only modes stay single-column (not scoped here). */
@media (min-width: 48rem) {
  .transcript[data-lang='both'] .sentence {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: var(--space-5);
    align-items: start;
  }

  .transcript[data-lang='both'] .sen-en {
    margin-top: 0;
  }
}