/* Shared explanation player — bounded, responsive emerald control. */
:root { --audio-player-emerald: #10b981; }
.quiz-audio-explanation-shell,
.study-explanation-media {
  box-sizing: border-box;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: center;
  width: min(100%, 368px);
  max-width: 100%;
  min-width: 0;
  gap: 8px;
}

.quiz-audio-artwork,
.study-explanation-artwork {
  grid-column: 1;
  grid-row: 1;
  width: 44px;
  height: 44px;
  min-width: 0;
  max-width: 100%;
}
.audio-admin-player,
.quiz-audio-explanation,
.study-explanation-player {
  grid-column: 2;
  grid-row: 1;
}
.audio-admin-player,
.quiz-audio-explanation,
.study-explanation-player {
  --audio-player-start: #34d399;
  --audio-player-mid: var(--audio-player-emerald);
  --audio-player-end: #059669;
  --audio-player-line: rgba(5, 150, 105, .24);
  --audio-player-glow: rgba(16, 185, 129, .3);
  --audio-player-track: #cfe4de;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: 40px minmax(42px, 1fr) 56px;
  align-items: center;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  min-height: 56px;
  column-gap: 10px;
  padding: 7px;
  overflow: visible;
  border: 1px solid var(--audio-player-line);
  border-radius: 999px;
  background: transparent;
  color: #17233a;
  box-shadow: 0 0 0 1px rgba(16, 185, 129, .05), 0 10px 28px rgba(5, 150, 105, .14);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  filter: none;
  opacity: 1;
  transition: border-color 180ms ease, background 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}
.audio-admin-player:hover,
.quiz-audio-explanation:hover,
.study-explanation-player:hover {
  border-color: rgba(5, 150, 105, .36);
  background: transparent;
  box-shadow: 0 0 0 1px rgba(16, 185, 129, .08), 0 14px 30px rgba(5, 150, 105, .18);
}
.audio-admin-player:focus-within,
.quiz-audio-explanation:focus-within,
.study-explanation-player:focus-within {
  border-color: #10b981;
  background: transparent;
  box-shadow: 0 0 0 3px rgba(38, 59, 212, .12), 0 14px 32px rgba(5, 150, 105, .2);
}
.audio-admin-player.is-playing,
.quiz-audio-explanation.is-playing,
.study-explanation-player.is-playing {
  border-color: rgba(5, 150, 105, .48);
  background: transparent;
  box-shadow: 0 0 0 1px rgba(16, 185, 129, .1), 0 15px 34px rgba(16, 185, 129, .22);
}
.audio-admin-player.is-interrupted,
.quiz-audio-explanation.is-interrupted,
.study-explanation-player.is-interrupted {
  --audio-player-start: #818cf8;
  --audio-player-mid: #4f46e5;
  --audio-player-end: #3730a3;
  --audio-player-line: rgba(79, 70, 229, .42);
  --audio-player-glow: rgba(79, 70, 229, .22);
  --audio-player-track: #dfe2ff;
  border-style: dashed;
  background: transparent;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, .07), 0 12px 28px rgba(55, 48, 163, .14);
}
.audio-admin-player.is-interrupted .audio-admin-player-play,
.quiz-audio-explanation.is-interrupted .quiz-audio-play,
.study-explanation-player.is-interrupted .study-explanation-play {
  animation: none;
}

/* Retire the route-level black active state; the player is always transparent. */
.quiz-audio-explanation.is-active {
  background: transparent;
}
.audio-admin-player-play,
.quiz-audio-play,
.study-explanation-play {
  position: relative;
  display: grid;
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: radial-gradient(100% 100% at 50% 0%, var(--audio-player-start) 0%, var(--audio-player-mid) 60%, var(--audio-player-end) 100%);
  color: #ffffff;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .7), 0 6px 18px var(--audio-player-glow);
  line-height: 0;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 180ms ease, box-shadow 180ms ease, filter 180ms ease;
}
.audio-admin-player-play::before,
/* Retire the legacy CSS triangle/bars; only the supplied SVG pair remains. */
.quiz-audio-play::before,
.study-explanation-play::before {
  content: none;
}

.audio-player-icon {
  grid-area: 1 / 1;
  display: block;
  width: 25px;
  height: 25px;
  pointer-events: none;
  transform-origin: center;
  transition: opacity 140ms ease, transform 180ms ease;
}

.audio-player-icon--play {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.audio-player-icon--pause {
  opacity: 0;
  transform: scale(.72) rotate(-8deg);
}
.audio-admin-player-play.is-playing .audio-player-icon--play,
.quiz-audio-play.is-playing .audio-player-icon--play,
.study-explanation-play.is-playing .audio-player-icon--play {
  opacity: 0;
  transform: scale(.72) rotate(8deg);
}
.audio-admin-player-play.is-playing .audio-player-icon--pause,
.quiz-audio-play.is-playing .audio-player-icon--pause,
.study-explanation-play.is-playing .audio-player-icon--pause {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}
.audio-admin-player-play.is-playing,
.quiz-audio-play.is-playing,
.study-explanation-play.is-playing {
  animation: audio-player-emerald-breathe 2.2s ease-in-out infinite;
}
.audio-admin-player-play:hover:not(:disabled),
.quiz-audio-play:hover:not(:disabled),
.study-explanation-play:hover:not(:disabled) {
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .78), 0 10px 23px var(--audio-player-glow);
  transform: translateY(-2px);
}
.audio-admin-player-play:active:not(:disabled),
.quiz-audio-play:active:not(:disabled),
.study-explanation-play:active:not(:disabled) {
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .72), 0 5px 13px var(--audio-player-glow);
  transform: translateY(0) scale(.96);
}
.audio-admin-player-play:focus-visible,
.audio-admin-player-speed:focus-visible,
.audio-admin-player-progress:focus-visible,
.quiz-audio-play:focus-visible,
.study-explanation-play:focus-visible,
.quiz-audio-speed:focus-visible,
.study-explanation-speed:focus-visible,
.quiz-audio-progress:focus-visible,
.study-explanation-progress:focus-visible {
  outline: 3px solid #263bd4;
  outline-offset: 3px;
}
.audio-admin-player-progress,
.quiz-audio-progress,
.study-explanation-progress {
  --progress: 0%;
  flex: 1 1 auto;
  min-width: 42px;
  height: 40px;
  margin: 0;
  padding: 0;
  appearance: none;
  border: 0;
  border-radius: 999px;
  outline: 0;
  background: linear-gradient(90deg, var(--audio-player-mid) 0 var(--progress), var(--audio-player-track) var(--progress) 100%) center / 100% 5px no-repeat;
  cursor: pointer;
  touch-action: pan-x;
}
.audio-admin-player-progress::-webkit-slider-runnable-track,
.quiz-audio-progress::-webkit-slider-runnable-track,
.study-explanation-progress::-webkit-slider-runnable-track {
  height: 5px;
  background: transparent;
}
.audio-admin-player-progress::-webkit-slider-thumb,
.quiz-audio-progress::-webkit-slider-thumb,
.study-explanation-progress::-webkit-slider-thumb {
  width: 15px;
  height: 15px;
  margin-top: -5px;
  appearance: none;
  border: 2px solid var(--audio-player-mid);
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 2px 7px rgba(15, 23, 42, .18);
}
.audio-admin-player-progress::-moz-range-track,
.quiz-audio-progress::-moz-range-track,
.study-explanation-progress::-moz-range-track {
  height: 5px;
  border: 0;
  background: var(--audio-player-track);
}
.audio-admin-player-progress::-moz-range-progress,
.quiz-audio-progress::-moz-range-progress,
.study-explanation-progress::-moz-range-progress {
  height: 5px;
  background: var(--audio-player-mid);
}
.audio-admin-player-progress::-moz-range-thumb,
.quiz-audio-progress::-moz-range-thumb,
.study-explanation-progress::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border: 2px solid var(--audio-player-mid);
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 2px 7px rgba(15, 23, 42, .18);
}
.audio-admin-player-speed,
.quiz-audio-speed,
.study-explanation-speed {
  display: inline-grid;
  flex: 0 0 auto;
  justify-self: stretch;
  width: 56px;
  min-width: 0;
  max-width: 56px;
  height: 40px;
  place-items: center;
  padding: 0 4px;
  border: 1px solid rgba(109, 40, 217, .18);
  border-radius: 999px;
  background: rgba(124, 58, 237, .08);
  color: #5b21b6;
  font: inherit;
  font-size: .74rem;
  font-weight: 900;
  line-height: 1;
  white-space: nowrap;
  transform-origin: center;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}
.audio-admin-player-speed:hover,
.quiz-audio-speed:hover,
.study-explanation-speed:hover {
  border-color: rgba(109, 40, 217, .3);
  background: #ffffff;
  box-shadow: 0 8px 18px rgba(109, 40, 217, .16);
  transform: translateY(-2px);
}
.audio-admin-player-speed:active,
.quiz-audio-speed:active,
.study-explanation-speed:active {
  transform: translateY(0);
}

@keyframes audio-player-emerald-breathe {
  0%,
  100% {
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .72), 0 6px 18px rgba(16, 185, 129, .28);
  }

  50% {
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .82), 0 9px 24px rgba(16, 185, 129, .46);
  }
}
.audio-admin-player.is-loading,
.quiz-audio-explanation.is-loading,
.study-explanation-player.is-loading {
  --audio-player-start: #94a3b8;
  --audio-player-mid: #64748b;
  --audio-player-end: #475569;
  --audio-player-line: rgba(71, 85, 105, .2);
  --audio-player-glow: rgba(71, 85, 105, .2);
  --audio-player-track: #dbe2ea;
  background: transparent;
  opacity: 1;
}

.quiz-audio-explanation.is-inactive {
  --audio-player-start: #94a3b8;
  --audio-player-mid: #64748b;
  --audio-player-end: #475569;
  --audio-player-line: rgba(71, 85, 105, .2);
  --audio-player-glow: rgba(71, 85, 105, .18);
  --audio-player-track: #dbe2ea;
  background: transparent;
  opacity: .78;
  filter: none;
}
.audio-admin-player.is-error,
.quiz-audio-explanation.is-error,
.study-explanation-player.is-error {
  --audio-player-start: #fb7185;
  --audio-player-mid: #ef4444;
  --audio-player-end: #dc2626;
  --audio-player-line: rgba(220, 38, 38, .2);
  --audio-player-glow: rgba(239, 68, 68, .25);
  --audio-player-track: #f3d8d8;
  background: transparent;
  opacity: 1;
  filter: none;
}

@media (max-width: 420px) {
  .quiz-audio-explanation-shell,
  .study-explanation-media {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 6px;
  }

  .quiz-audio-artwork,
  .study-explanation-artwork {
    width: 42px;
    height: 42px;
  }
.audio-admin-player,
.quiz-audio-explanation,
  .study-explanation-player {
    grid-template-columns: 40px minmax(36px, 1fr) 52px;
    column-gap: 6px;
    padding: 7px 6px;
  }
.audio-admin-player-speed,
.quiz-audio-speed,
  .study-explanation-speed {
    width: 52px;
    max-width: 52px;
    font-size: .68rem;
  }
}

/* Compact Study variant on web and Android. Keep 44px touch targets while
   removing the padded outer pill and its glow; other players are unchanged. */
.study-page .study-explanation-media { grid-template-columns: 36px minmax(0, 1fr); gap: 8px; }
.study-page .study-explanation-artwork { width: 36px; height: 36px; }
.study-page .study-explanation-player {
  grid-template-columns: 44px minmax(0, 1fr) 52px;
  min-height: 44px; height: 44px; padding: 0; gap: 6px;
  border: 0; border-radius: 0; background: transparent; box-shadow: none;
}
.study-page .study-explanation-play {
  width: 44px; height: 44px; flex-basis: 44px; border: 4px solid transparent;
  background-clip: padding-box; box-shadow: none; animation: none; transform: none;
}
.study-page .study-explanation-play:hover:not(:disabled) { filter: brightness(.94); }
.study-page .study-explanation-play:active:not(:disabled) { filter: brightness(.85); }
.study-page .study-explanation-progress { min-width: 0; height: 44px; }
.study-page .study-explanation-speed {
  width: 52px; max-width: 52px; height: 44px; border: 0;
  border-radius: 10px; background: transparent; box-shadow: none; transform: none;
  font-size: .78rem;
}
html.android-webview .study-page .study-explanation-speed { background: transparent; }
.study-page .study-explanation-speed:hover { background: var(--audio-player-line); }
.study-page .study-explanation-player.is-interrupted .study-explanation-play {
  outline: 1px dashed var(--audio-player-mid); outline-offset: -2px;
}

@media (prefers-reduced-motion: reduce) {
.audio-admin-player,
.audio-admin-player-play,
.audio-admin-player-speed,
.quiz-audio-explanation,
  .study-explanation-player,
  .quiz-audio-play,
  .study-explanation-play,
  .audio-player-icon,
  .quiz-audio-speed,
  .study-explanation-speed {
    transition: none;
  }
.audio-admin-player-play.is-playing,
.quiz-audio-play.is-playing,
  .study-explanation-play.is-playing {
    animation: none;
  }
.audio-admin-player-play:hover:not(:disabled),
.audio-admin-player-speed:hover,
.quiz-audio-play:hover:not(:disabled),
  .study-explanation-play:hover:not(:disabled),
  .quiz-audio-speed:hover,
  .study-explanation-speed:hover {
    transform: none;
  }
}

@media (forced-colors: active) {
.audio-admin-player,
.audio-admin-player-play,
.audio-admin-player-speed,
.quiz-audio-explanation,
  .study-explanation-player,
  .quiz-audio-play,
  .study-explanation-play,
  .quiz-audio-speed,
  .study-explanation-speed {
    border: 1px solid ButtonText;
    background: ButtonFace;
    color: ButtonText;
    box-shadow: none;
    forced-color-adjust: auto;
  }
.audio-admin-player.is-interrupted,
.quiz-audio-explanation.is-interrupted,
  .study-explanation-player.is-interrupted {
    border-style: dashed;
  }
}

/* Compact web live-Quiz variant. Study/Admin and Android keep their owners. */
html:not(.android-webview) .quiz-page .quiz-audio-explanation-shell {
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 6px;
}
html:not(.android-webview) .quiz-page .quiz-audio-artwork { width: 30px; height: 30px; }
html:not(.android-webview) .quiz-page .quiz-audio-explanation {
  grid-template-columns: 44px minmax(0, 1fr) 44px;
  height: 44px; min-height: 44px;
  padding: 0; gap: 6px;
  border: 0; border-radius: 24px;
  box-shadow: inset 0 0 0 1px var(--audio-player-line);
}
html:not(.android-webview) .quiz-page .quiz-audio-play {
  width: 44px; height: 44px; box-shadow: inset 0 0 0 4px white;
}
html:not(.android-webview) .quiz-page .quiz-audio-play .audio-player-icon { width: 23px; height: 23px; }
html:not(.android-webview) .quiz-page .quiz-audio-progress { height: 44px; min-width: 0; }
html:not(.android-webview) .quiz-page .quiz-audio-speed {
  width: 44px; max-width: 44px; height: 44px; padding: 0 2px;
  background: transparent; border: 0; box-shadow: none;
}
@media (forced-colors: active) {
  html:not(.android-webview) .quiz-page .quiz-audio-explanation { border: 1px solid CanvasText; }
  html:not(.android-webview) .quiz-page :is(.quiz-audio-play, .quiz-audio-speed) { border: 1px solid ButtonText; box-shadow: none; }
}

/* Installed Android live-Quiz variant. Web, Study/Admin and result rows are unchanged. */
html.android-webview .quiz-page.quiz-focus .quiz-audio-explanation-shell { display: block; min-width: 0; }
html.android-webview .quiz-page.quiz-focus .quiz-audio-explanation-shell.hidden { display: none; }
html.android-webview .quiz-page.quiz-focus .quiz-audio-explanation {
  --audio-player-mid: var(--app-palette-primary);
  --audio-player-track: var(--app-palette-divider);
  display: grid; grid-template-columns: 44px minmax(0, 1fr) 48px;
  width: 100%; min-width: 0; min-height: 44px; height: 44px;
  padding: 0; gap: 6px; border: 0; border-radius: 12px;
  background: transparent; box-shadow: none;
}
html.android-webview .quiz-page.quiz-focus .quiz-audio-play {
  width: 44px; height: 44px; padding: 9px; border: 0; border-radius: 12px;
  background: var(--app-palette-primary); box-shadow: none; animation: none;
  transform: none;
}
html.android-webview .quiz-page.quiz-focus .quiz-audio-play .audio-player-icon { width: 26px; height: 26px; filter: brightness(0) invert(1); }
html.android-webview .quiz-page.quiz-focus .quiz-audio-progress {
  min-width: 0; height: 44px; border-radius: 6px;
  --audio-player-mid: var(--app-palette-primary);
  --audio-player-track: var(--app-palette-divider);
}
html.android-webview .quiz-page.quiz-focus .quiz-audio-progress::-webkit-slider-thumb { box-shadow: none; }
html.android-webview .quiz-page.quiz-focus .quiz-audio-progress::-moz-range-thumb { box-shadow: none; }
html.android-webview .quiz-page.quiz-focus .quiz-audio-speed {
  width: 48px; max-width: 48px; height: 44px; padding: 0 2px;
  border: 0; border-radius: 10px; background: transparent;
  color: var(--app-palette-primary-strong); font: 700 14px/1 Arial, sans-serif;
  box-shadow: none; transform: none;
}
html.android-webview .quiz-page.quiz-focus .quiz-audio-explanation.is-interrupted .quiz-audio-play { outline: 2px dashed var(--app-palette-border); outline-offset: 2px; }
html.android-webview .quiz-page.quiz-focus .quiz-audio-explanation.is-error .quiz-audio-play { background: var(--app-palette-secondary); }
html.android-webview .quiz-page.quiz-focus .quiz-audio-play:hover:not(:disabled) { background: var(--app-palette-primary-strong); }
html.android-webview .quiz-page.quiz-focus .quiz-audio-speed:hover:not(:disabled) { background: var(--app-palette-paper); }
html.android-webview .quiz-page.quiz-focus .quiz-audio-play:active:not(:disabled) { transform: scale(.96); }
@media (prefers-reduced-motion: reduce) {
  html.android-webview .quiz-page.quiz-focus .quiz-audio-play:active:not(:disabled) { transform: none; }
}
@media (forced-colors: active) {
  html.android-webview .quiz-page.quiz-focus :is(.quiz-audio-play, .quiz-audio-speed) { border: 1px solid ButtonText; }
}