html { font-size: 100%; }
.page-shell { --content-width: 70rem; }
.page-heading { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin-bottom: 1.75rem; }
.page-heading .back-link { margin-bottom: 0; }
.page-heading h1 { margin: 0; color: var(--ink-soft); font-family: var(--sans); font-size: 0.85rem; font-weight: 500; letter-spacing: 0; line-height: 1.6; }
.playlist {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: var(--card);
  box-shadow: var(--shadow);
}
.now-playing {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: clamp(1.4rem, 3.5vw, 2.5rem);
  background: linear-gradient(145deg, var(--theme-green-soft), var(--card) 85%);
}
.headphones-icon { display: block; width: 6rem; height: 6rem; margin: 0 auto 1.25rem; color: var(--accent-deep); opacity: 0.65; }
.headphones-icon__cushions { fill: color-mix(in srgb, currentColor 55%, var(--card)); }
#lesson-details { text-align: center; }
.now-playing h2 { margin: 0; font-family: var(--serif); font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 500; line-height: 1.4; overflow-wrap: anywhere; }
.now-playing__english { margin: 0.4rem 0 0; color: var(--ink-soft); font-size: 0.95rem; }
.audio-player { margin-top: 1.5rem; }
.audio-player audio { width: 100%; }
.audio-player__ui, .playlist__tools { display: none; }
.playlist--ready .audio-player audio { display: none; }
.playlist--ready .audio-player__ui { display: block; }
.playlist--ready .playlist__tools { display: flex; }
.audio-player__range {
  --progress: 0%;
  display: block;
  width: 100%;
  height: 2.75rem;
  margin: 0;
  padding: 0;
  appearance: none;
  background: transparent;
  cursor: pointer;
  accent-color: var(--accent-deep);
}
.audio-player__range::-webkit-slider-runnable-track { height: 0.3rem; border-radius: 999px; background: linear-gradient(to right, var(--accent-deep) var(--progress), var(--line) var(--progress)); }
.audio-player__range::-moz-range-track { height: 0.3rem; border-radius: 999px; background: linear-gradient(to right, var(--accent-deep) var(--progress), var(--line) var(--progress)); }
.audio-player__range::-webkit-slider-thumb { appearance: none; width: 0.9rem; height: 0.9rem; margin-top: -0.3rem; border: 2px solid var(--card); border-radius: 50%; background: var(--accent-deep); box-shadow: 0 1px 5px rgba(32, 51, 46, 0.2); }
.audio-player__range::-moz-range-thumb { width: 0.9rem; height: 0.9rem; border: 2px solid var(--card); border-radius: 50%; background: var(--accent-deep); box-shadow: 0 1px 5px rgba(32, 51, 46, 0.2); }
.audio-player__range:disabled { opacity: 0.5; cursor: default; }
.audio-player__times { display: flex; justify-content: space-between; color: var(--ink-soft); font-size: 0.75rem; font-variant-numeric: tabular-nums; }
.audio-player__transport { display: flex; align-items: center; justify-content: center; gap: 1.5rem; margin: 0 0 1.4rem; }
.audio-player__button { display: inline-flex; align-items: center; justify-content: center; min-width: 2.75rem; min-height: 2.75rem; padding: 0.5rem; border: 0; border-radius: 0.75rem; color: var(--ink); background: transparent; cursor: pointer; touch-action: manipulation; }
.audio-player__button svg { width: 1.3rem; height: 1.3rem; flex-shrink: 0; }
.audio-player__button:hover:not(:disabled) { background: var(--theme-hover); }
.audio-player__button:disabled { opacity: 0.3; cursor: default; }
.audio-player__track { width: 2.75rem; height: 2.75rem; }
.audio-player__play { gap: 0.6rem; min-width: 9rem; height: 4rem; padding-inline: 1.5rem; border-radius: 999px; color: var(--theme-on-accent); background: var(--accent-deep); box-shadow: 0 6px 18px rgba(32, 51, 46, 0.18); font-size: 1.1rem; font-weight: 700; }
.audio-player__play:hover:not(:disabled) { color: var(--theme-on-accent); background: var(--accent); }
.audio-player__play svg { width: 1.7rem; height: 1.7rem; }
.audio-player__play[aria-pressed="true"] .icon-play,
.audio-player__play[aria-pressed="false"] .icon-pause,
.audio-player__button[aria-pressed="true"] .icon-volume,
.audio-player__button[aria-pressed="false"] .icon-muted { display: none; }
.audio-player__extras { display: flex; justify-content: space-between; align-items: flex-start; gap: 1.5rem; margin-top: 1rem; }
.audio-player__volume { display: flex; align-items: center; flex: 0 1 8rem; gap: 0.25rem; min-width: 0; }
.audio-player__speed { display: grid; grid-template-columns: 1.25rem minmax(3rem, 1fr) 1.25rem; align-items: center; gap: 0 0.35rem; flex: 0 1 11rem; min-width: 0; color: var(--ink-soft); }
.audio-player__speed svg { display: block; width: 1.25rem; height: 1.25rem; }
.audio-player__speed output { grid-column: 2; justify-self: center; margin-top: -0.2rem; font-size: 0.7rem; line-height: 1.2; font-variant-numeric: tabular-nums; }
.audio-player__range:focus-visible { outline: 3px solid var(--theme-focus); outline-offset: 3px; border-radius: 0.2rem; }
.voice-picker { min-width: 0; margin: 1.25rem 0 0; padding: 0; border: 0; }
.voice-picker legend { margin-bottom: 0.5rem; padding: 0; color: var(--ink-soft); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.voice-picker__options { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: 0.5rem; }
.voice-picker__option { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 0.1rem 0.6rem; min-height: 2.75rem; padding: 0.55rem 0.8rem; border: 1px solid var(--line); border-radius: 0.85rem; background: var(--card); cursor: pointer; }
.voice-picker__option:hover { background: var(--theme-hover); }
.voice-picker__option:has(:checked) { border-color: var(--accent-deep); background: var(--theme-green-soft); }
.voice-picker__option:has(:focus-visible) { outline: 3px solid var(--theme-focus); outline-offset: 2px; }
.voice-picker__option input { grid-row: span 2; width: 1rem; height: 1rem; margin: 0; accent-color: var(--accent-deep); cursor: pointer; }
.voice-picker__option input:focus-visible { outline: none; }
.voice-picker__names { font-size: 0.85rem; font-weight: 700; line-height: 1.3; }
.voice-picker__style { color: var(--ink-soft); font-size: 0.7rem; line-height: 1.35; }
.playlist__queue { min-width: 0; padding: 1.6rem 1.25rem 1.25rem; border-left: 1px solid var(--line); }
.playlist__heading { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; padding: 0 0.55rem 0.5rem; }
.playlist__heading h2 { margin: 0; font-size: 1rem; font-weight: 700; }
.playlist__list { display: grid; gap: 0.3rem; margin: 0; padding: 0; list-style: none; }
.lesson { display: grid; grid-template-columns: 2rem minmax(0, 1fr) 2.3rem; gap: 0.7rem; align-items: center; min-height: 4.6rem; padding: 0.75rem 0.7rem; border: 1px solid transparent; border-radius: 0.85rem; color: var(--ink); text-decoration: none; }
.lesson:hover { background: var(--theme-hover); }
.lesson[aria-current="true"] { border-color: var(--line); background: var(--theme-green-soft); }
.lesson__number { display: grid; width: 2rem; height: 2rem; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--ink-soft); font-size: 0.7rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.lesson[aria-current="true"] .lesson__number { border-color: transparent; color: var(--theme-on-accent); background: var(--accent-deep); }
.lesson__titles { display: grid; gap: 0.15rem; }
.lesson__japanese { font-size: 1rem; font-weight: 600; }
.lesson__english { color: var(--ink-soft); font-size: 0.73rem; line-height: 1.45; }
.lesson__end { display: grid; gap: 0.2rem; justify-items: center; color: var(--ink-soft); }
.lesson__duration { font-size: 0.7rem; font-variant-numeric: tabular-nums; }
.lesson__end svg { width: 1rem; height: 1rem; }
.lesson__playing, .lesson[data-playing="true"] .lesson__play { display: none; }
.lesson[data-playing="true"] .lesson__playing { display: block; color: var(--accent-deep); }
.playlist__tools { gap: 0.15rem; }
.playlist__tool { position: relative; display: inline-flex; align-items: center; justify-content: center; width: 2.75rem; height: 2.75rem; padding: 0; border: 0; border-radius: 50%; color: var(--ink-soft); background: transparent; cursor: pointer; }
.playlist__tool svg { width: 1.1rem; height: 1.1rem; }
.playlist__tool:hover { color: var(--accent-deep); background: var(--theme-hover); }
.playlist__tool:focus-visible { outline: 3px solid var(--theme-focus); outline-offset: 2px; }
.playlist__tooltip {
  position: absolute;
  z-index: 2;
  top: calc(100% + 0.35rem);
  right: 0;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  color: var(--ink);
  background: var(--card);
  box-shadow: var(--shadow-hover);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.4;
  white-space: nowrap;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.12s ease;
}
.playlist__tool:is(:hover, :focus-visible) .playlist__tooltip { visibility: visible; opacity: 1; transition-delay: 0.25s; }
.narration-dialog {
  width: min(100% - 2rem, 40rem);
  max-height: min(100% - 2rem, 48rem);
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  color: var(--ink);
  background: var(--card);
  box-shadow: 0 28px 90px rgba(24, 47, 42, 0.28);
}
.narration-dialog[open] { display: flex; flex-direction: column; }
.narration-dialog::backdrop { background: rgba(23, 39, 35, 0.48); backdrop-filter: blur(0.25rem); }
.narration-dialog__header { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; padding: 1.4rem 1.25rem 1rem 1.6rem; border-bottom: 1px solid var(--line); background: linear-gradient(145deg, var(--theme-green-soft), var(--card) 85%); }
.narration-dialog__kicker { margin: 0 0 0.3rem; color: var(--accent-deep); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.narration-dialog h2 { margin: 0; font-family: var(--serif); font-size: 1.6rem; font-weight: 500; line-height: 1.35; }
.narration-dialog__english { margin: 0.2rem 0 0; color: var(--ink-soft); font-size: 0.85rem; }
.narration-dialog__close { display: inline-flex; flex-shrink: 0; align-items: center; justify-content: center; width: 2.5rem; height: 2.5rem; padding: 0; border: 1px solid var(--line); border-radius: 50%; color: var(--ink); background: var(--card); cursor: pointer; }
.narration-dialog__close svg { width: 1.1rem; height: 1.1rem; }
.narration-dialog__close:hover { background: var(--theme-hover); }
.narration-dialog__close:focus-visible { outline: 3px solid var(--theme-focus); outline-offset: 2px; }
.narration-dialog__body { overflow-y: auto; overscroll-behavior: contain; padding: 1.25rem 1.6rem 1.6rem; }
.narration-dialog__body:focus { outline: none; }
.narration-dialog__message { margin: 0; color: var(--ink-soft); }
.narration { display: grid; gap: 0.85rem; margin: 0; padding: 0; list-style: none; }
.narration__turn p { margin: 0; line-height: 1.65; }
.narration__turn p + p { margin-top: 0.4rem; }
.narration__speaker { display: block; margin-bottom: 0.15rem; color: var(--ink-soft); font-size: 0.65rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.narration__turn--japanese { padding: 0.65rem 0.9rem; border-left: 3px solid var(--accent-deep); border-radius: 0.5rem; background: var(--theme-green-soft); }
.narration__turn--japanese p { font-size: 1.15rem; font-weight: 600; }
.player-status { margin: 1rem 0 0; color: var(--ink-soft); font-size: 0.85rem; }
.player-status:empty { margin: 0; }
.audio-fallback { grid-column: 1 / -1; padding: 1rem 2rem; }
.audio-fallback a { color: var(--accent-deep); }
@media (max-width: 48rem) {
  .playlist { grid-template-columns: minmax(0, 1fr); }
  .now-playing { padding: 1.5rem; }
  .playlist__queue { border-left: 0; border-top: 1px solid var(--line); }
  .page-heading { margin-bottom: 1.5rem; }
}
@media (max-width: 24rem) {
  .now-playing, .playlist__queue { padding: 1.1rem; }
  .narration-dialog__header { padding: 1.1rem 0.9rem 0.9rem 1.1rem; }
  .narration-dialog__body { padding: 1rem 1.1rem 1.25rem; }
  .lesson { gap: 0.5rem; padding-inline: 0.4rem; }
  .audio-player__transport { gap: 1.1rem; }
  .audio-player__extras { gap: 0.75rem; }
  .voice-picker__option { column-gap: 0.45rem; padding-inline: 0.6rem; }
}