/*------------------------------------------------------------------------------
EPISODE（各話のページ）
読書のための部品だけを定義する（見出し・本文・共有・前後への移動は css/article.css）。
- 読んだ量（.reading-progress）：画面上端の金の線。先端に菱形が光る
- 目次（.ep-index）：どの画面の幅でも、左下のボタンで左から引き出す（最初は閉じている）
- 補助メニュー（.reader-tools）：右下のボタンで開く小さな窓。登場人物・用語・文字の大きさ・BGM
- 手引き（.ep-guide）：補助メニューから開く共通のダイアログ（.lv-dialog--sheet）の中身。登場人物と用語をタブで切り替える
- 用語の吹き出し（.episode__term-popover）：本文中の語を押す・選ぶと出る説明
動きは opacity と transform だけ（js/episode.js・js/main.js がクラスを付け外しする）。
------------------------------------------------------------------------------*/
:root {
  --ep-gold: var(--lv-color-accent-gold);
  --ep-gold-light: var(--lv-color-accent-gold-light);
  --ep-line: rgba(var(--lv-gold-rgb), 0.38);
  --ep-rule: rgba(var(--lv-gold-rgb), 0.16);
  --ep-ink-soft: rgba(242, 246, 250, 0.72);
  /* 本文の上に重なる窓の地（わずかでも透かすと、下の白い文字が透けて見えるため不透明にする） */
  --ep-ground: var(--lv-color-navy);
  --ep-ease: var(--lv-ease-out);
}

/* 菱形と細い線を添えた英字の見出し（目次・補助メニューで共通） */
.ep-index__label,
.reader-tools__label {
  display: flex;
  align-items: center;
  column-gap: 10px;
  color: var(--ep-gold);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.32em;
}
.ep-index__label::before,
.reader-tools__label::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background-color: var(--ep-gold);
  transform: rotate(45deg);
}
.ep-index__label::after,
.reader-tools__label::after {
  content: "";
  flex: 1 1 auto;
  max-width: 64px;
  height: 1px;
  background: linear-gradient(90deg, var(--ep-line), transparent);
}

/*------------------------------------------------------------------------------
読んだ量：画面上端の金の線（js/episode.js が scaleX と先端の位置だけを書き換える）
------------------------------------------------------------------------------*/
.reading-progress {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1001;
  height: 2px;
  background-color: rgba(var(--lv-gold-rgb), 0.14);
  pointer-events: none;
}
.reading-progress__bar {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(var(--lv-gold-rgb), 0.45),
    var(--ep-gold) 72%,
    #f3dcae
  );
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}
/* 先端の菱形（読み始めると灯り、読み終えると消える） */
.reading-progress__tip {
  position: absolute;
  top: 1px;
  left: 0;
  width: 7px;
  height: 7px;
  margin: -3.5px 0 0 -3.5px;
  opacity: 0;
  transition: opacity 0.4s ease;
  will-change: transform;
}
.reading-progress__tip::before {
  content: "";
  position: absolute;
  inset: 0;
  background-color: #f3dcae;
  box-shadow: 0 0 10px 2px rgba(243, 220, 174, 0.7);
  transform: rotate(45deg);
}
.reading-progress.is-started .reading-progress__tip {
  opacity: 1;
}
.reading-progress.is-complete .reading-progress__tip {
  opacity: 0;
}

/*------------------------------------------------------------------------------
目次
------------------------------------------------------------------------------*/
/* 左下のボタン */
.ep-index-toggle {
  position: fixed;
  bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  left: 16px;
  z-index: 950;
  display: inline-flex;
  align-items: center;
  column-gap: 10px;
  height: 48px;
  padding: 0 18px 0 16px;
  color: var(--lv-color-white);
  font: inherit;
  font-size: 12px;
  letter-spacing: 0.18em;
  background-color: var(--ep-ground);
  border: 1px solid var(--ep-line);
  border-radius: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  transition: border-color 0.3s ease;
}
.ep-index-toggle:hover,
.ep-index-toggle[aria-expanded="true"] {
  border-color: var(--ep-gold);
}
.ep-index-toggle:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 2px var(--ep-gold),
    0 10px 30px rgba(0, 0, 0, 0.35);
}
/* 一覧の印：長さの違う三本の線 */
.ep-index-toggle__icon {
  display: grid;
  row-gap: 4px;
  width: 16px;
}
.ep-index-toggle__icon > span {
  display: block;
  height: 1px;
  background-color: var(--ep-gold);
}
.ep-index-toggle__icon > span:nth-child(2) {
  width: 11px;
}
.ep-index-toggle__icon > span:nth-child(3) {
  width: 14px;
}

/* 一覧の窓：左から引き出す（開いている間は外側を暗くする） */
.ep-index {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  width: min(84vw, 340px);
  color: var(--lv-color-white);
  background: var(--lv-color-navy) url(../img/bg-black-sp.webp) left center / cover
    no-repeat;
  border-right: 1px solid var(--ep-line);
  visibility: hidden;
  transform: translate3d(-100%, 0, 0);
  transition:
    transform 0.45s ease,
    visibility 0s linear 0.45s;
}
.ep-index.is-open {
  visibility: visible;
  box-shadow: 24px 0 60px rgba(0, 0, 0, 0.5);
  transform: none;
  transition: transform 0.6s var(--ep-ease);
}
.ep-index-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1099;
  background-color: rgba(2, 6, 12, 0.66);
  opacity: 0;
  transition: opacity 0.35s ease;
}
.ep-index-backdrop[hidden] {
  display: none;
}
.ep-index-backdrop.is-visible {
  opacity: 1;
}
.ep-index__head {
  position: relative;
  flex: 0 0 auto;
  padding: 26px 76px 16px 22px;
  border-bottom: 1px solid var(--ep-rule);
}
/* 閉じるボタン（共通の .lv-close） */
.ep-index__close {
  position: absolute;
  top: 18px;
  right: 16px;
}
.ep-index__label {
  margin: 0 0 12px;
}
/* 一覧へ戻る：細い矢印 */
.ep-index__back {
  display: inline-flex;
  align-items: center;
  column-gap: 12px;
  min-height: 40px;
  color: var(--lv-color-white);
  font-size: 13px;
  letter-spacing: 0.12em;
  transition: color 0.3s ease;
}
.ep-index__back-arrow {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 1px;
  background-color: var(--ep-gold);
  transition: width 0.4s var(--ep-ease);
}
.ep-index__back-arrow::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 6px;
  height: 6px;
  border-top: 1px solid var(--ep-gold);
  border-left: 1px solid var(--ep-gold);
  transform: rotate(-45deg);
}
.ep-index__back:hover {
  color: var(--ep-gold-light);
}
.ep-index__back:hover .ep-index__back-arrow {
  width: 32px;
}
.ep-index__back:focus-visible,
.ep-index__link:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 1px var(--ep-gold);
}
.ep-index__list {
  flex: 1 1 auto;
  min-height: 0;
  margin: 0;
  padding: 6px 0 40px;
  overflow-y: auto;
  overscroll-behavior: contain;
  list-style: none;
  scrollbar-width: thin;
  scrollbar-color: var(--ep-line) transparent;
}
.ep-index__link {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "no date"
    "title title";
  column-gap: 10px;
  row-gap: 4px;
  padding: 14px 22px 15px 26px;
  border-bottom: 1px solid rgba(var(--lv-gold-rgb), 0.09);
  transition: background-color 0.3s ease;
}
.ep-index__no {
  grid-area: no;
  color: var(--ep-gold);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.16em;
}
.ep-index__date {
  grid-area: date;
  color: rgba(242, 246, 250, 0.48);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.1em;
}
.ep-index__title {
  grid-area: title;
  color: var(--lv-color-white);
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  overflow-wrap: anywhere;
  transition: color 0.3s ease;
}
/* 左端の金の線：重ねると半分、今の話は全部 */
.ep-index__link::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 0;
  width: 2px;
  background-color: var(--ep-gold);
  transform: scaleY(0);
  transition: transform 0.4s var(--ep-ease);
}
.ep-index__link:hover {
  background-color: rgba(var(--lv-gold-rgb), 0.07);
}
.ep-index__link:hover::before {
  transform: scaleY(0.5);
}
.ep-index__link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(var(--lv-gold-rgb), 0.16), rgba(var(--lv-gold-rgb), 0));
}
.ep-index__link[aria-current="page"]::before {
  transform: none;
}
.ep-index__link[aria-current="page"] .ep-index__title {
  color: var(--ep-gold-light);
}
/* 読み終えた話（塗った菱形・題を少し落とす）と、読みかけの話（輪郭の菱形）。この端末の読書の記録（js/episode.js） */
.ep-index__link.is-read .ep-index__title {
  color: rgba(242, 246, 250, 0.6);
}
.ep-index__link.is-read::after,
.ep-index__link.is-reading::after {
  content: "";
  position: absolute;
  right: 24px;
  bottom: 22px;
  width: 6px;
  height: 6px;
  transform: rotate(45deg);
}
.ep-index__link.is-read::after {
  background-color: var(--ep-gold);
  opacity: 0.75;
}
.ep-index__link.is-reading::after {
  border: 1px solid var(--ep-gold-light);
}
/* 今の話の印（菱形） */
.ep-index__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  top: 50%;
  left: -3px;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  background-color: var(--ep-gold);
  box-shadow: 0 0 8px rgba(var(--lv-gold-rgb), 0.8);
  transform: rotate(45deg);
}

/*------------------------------------------------------------------------------
補助メニュー（右下）
------------------------------------------------------------------------------*/
.reader-tools {
  position: fixed;
  right: 16px;
  bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  z-index: 950;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  row-gap: 12px;
}
.reader-tools__toggle {
  position: relative;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  padding: 0;
  color: var(--lv-color-white);
  background-color: var(--ep-ground);
  border: 1px solid var(--ep-line);
  border-radius: var(--lv-radius-circle);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  transition: border-color 0.3s ease;
}
.reader-tools__toggle:hover,
.reader-tools.is-open .reader-tools__toggle {
  border-color: var(--ep-gold);
}
.reader-tools__toggle:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 2px var(--ep-gold),
    0 10px 30px rgba(0, 0, 0, 0.4);
}
/* ＋の印（開くと回って ×） */
.reader-tools__toggle-icon {
  position: relative;
  width: 18px;
  height: 18px;
  transition: transform 0.5s var(--ep-ease);
}
.reader-tools__toggle-icon > span {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  margin-top: -0.5px;
  background-color: currentColor;
}
.reader-tools__toggle-icon > span + span {
  transform: rotate(90deg);
}
.reader-tools.is-open .reader-tools__toggle-icon {
  transform: rotate(135deg);
}
/* 再生中の印（右上に、揺れる三本の棒） */
.reader-tools__badge {
  position: absolute;
  top: -3px;
  right: -3px;
  display: none;
  align-items: flex-end;
  column-gap: 2px;
  height: 16px;
  padding: 3px 4px;
  background-color: var(--ep-gold);
  border-radius: 8px;
}
.reader-tools__badge > i {
  display: block;
  width: 2px;
  height: 100%;
  background-color: var(--lv-color-navy);
  transform: scaleY(0.4);
  transform-origin: bottom;
}
.reader-tools.is-playing .reader-tools__badge {
  display: inline-flex;
}

/* 開く窓：ボタンの上に、右下を起点に現れる */
.reader-tools__panel {
  width: min(300px, calc(100vw - 32px));
  max-height: calc(100vh - 120px);
  padding: 16px 6px 8px;
  overflow-y: auto;
  overscroll-behavior: contain;
  color: var(--lv-color-white);
  background-color: var(--ep-ground);
  border: 1px solid var(--ep-line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transform: translate3d(0, 12px, 0) scale(0.98);
  transform-origin: 100% 100%;
  transition:
    opacity 0.22s ease,
    transform 0.22s ease;
}
.reader-tools__panel[hidden] {
  display: none;
}
.reader-tools__panel.is-visible {
  opacity: 1;
  transform: none;
  transition:
    opacity 0.3s ease,
    transform 0.5s var(--ep-ease);
}
.reader-tools__label {
  margin: 0 12px 10px;
}
.reader-tools__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.reader-tools__item {
  display: flex;
  align-items: center;
  column-gap: 14px;
  width: 100%;
  min-height: 56px;
  padding: 8px 12px;
  color: var(--lv-color-white);
  font: inherit;
  text-align: left;
  background: none;
  border: 0;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 0.25s ease;
}
.reader-tools__item:hover {
  background-color: rgba(var(--lv-gold-rgb), 0.1);
}
.reader-tools__item:focus-visible,
.reader-tools__play:focus-visible,
.reader-tools__track:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 1px var(--ep-gold);
}
.reader-tools__icon {
  display: grid;
  place-items: center;
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  color: var(--ep-gold);
  border: 1px solid var(--ep-rule);
  border-radius: var(--lv-radius-circle);
}
.reader-tools__icon .lv-icon {
  width: 16px;
  height: 16px;
}
.reader-tools__text {
  display: grid;
  flex: 1 1 auto;
  row-gap: 3px;
  min-width: 0;
}
.reader-tools__name {
  font-size: 14px;
  line-height: 1.3;
  letter-spacing: 0.1em;
}
.reader-tools__en {
  overflow: hidden;
  color: var(--ep-ink-soft);
  font-size: 10px;
  line-height: 1.3;
  letter-spacing: 0.2em;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.reader-tools__count {
  min-width: 26px;
  padding: 2px 8px;
  color: var(--ep-gold);
  font-size: 11px;
  line-height: 1.4;
  text-align: center;
  border: 1px solid var(--ep-line);
  border-radius: 999px;
}
/* 文字の大きさ：大きさの違う三つの「あ」から選ぶ（選んだものに金の輪） */
.reader-tools__size,
.reader-tools__music {
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px solid var(--ep-rule);
}
.reader-tools__size-row {
  display: flex;
  align-items: center;
  column-gap: 14px;
  min-height: 56px;
  padding: 8px 8px 8px 12px;
}
.reader-tools__sizes {
  display: flex;
  flex: 0 0 auto;
  column-gap: 2px;
}
.reader-tools__size-option {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  padding: 0;
  color: var(--ep-ink-soft);
  font: inherit;
  line-height: 1;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--lv-radius-circle);
  cursor: pointer;
  transition:
    color 0.25s ease,
    border-color 0.25s ease,
    background-color 0.25s ease;
}
.reader-tools__size-option--small {
  font-size: 11px;
}
.reader-tools__size-option--medium {
  font-size: 14px;
}
.reader-tools__size-option--large {
  font-size: 17px;
}
.reader-tools__size-option:hover {
  color: var(--lv-color-white);
  background-color: rgba(var(--lv-gold-rgb), 0.1);
}
.reader-tools__size-option[aria-pressed="true"] {
  color: var(--ep-gold-light);
  border-color: var(--ep-line);
}
.reader-tools__size-option:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 1px var(--ep-gold);
}
/* BGM：曲の一覧の開閉と、一時停止・再開のボタン */
.reader-tools__music-row {
  display: flex;
  align-items: center;
}
.reader-tools__music-row .reader-tools__item {
  flex: 1 1 auto;
  min-width: 0;
}
.reader-tools__chevron {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin: -4px 6px 0 0;
  border-right: 1px solid var(--ep-gold);
  border-bottom: 1px solid var(--ep-gold);
  transform: rotate(45deg);
  transition: transform 0.35s var(--ep-ease);
}
.reader-tools__item[aria-expanded="true"] .reader-tools__chevron {
  margin-top: 4px;
  transform: rotate(-135deg);
}
.reader-tools__play {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  margin: 0 8px 0 4px;
  padding: 0;
  color: var(--lv-color-white);
  background: none;
  border: 1px solid var(--ep-line);
  border-radius: var(--lv-radius-circle);
  cursor: pointer;
  transition:
    border-color 0.3s ease,
    opacity 0.3s ease;
}
.reader-tools__play:hover:not(:disabled) {
  border-color: var(--ep-gold);
}
.reader-tools__play:disabled {
  opacity: 0.32;
  cursor: default;
}
.reader-tools__play .lv-icon {
  width: 13px;
  height: 13px;
}
.reader-tools__tracks {
  margin: 2px 8px 8px 62px;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--ep-rule);
}
.reader-tools__tracks[hidden] {
  display: none;
}
.reader-tools__track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  column-gap: 10px;
  width: 100%;
  min-height: 40px;
  padding: 6px 10px 6px 16px;
  color: var(--ep-ink-soft);
  font: inherit;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-align: left;
  background: none;
  border: 0;
  cursor: pointer;
  transition:
    color 0.25s ease,
    background-color 0.25s ease;
}
.reader-tools__track:hover {
  color: var(--lv-color-white);
  background-color: rgba(var(--lv-gold-rgb), 0.08);
}
.reader-tools__track[aria-pressed="true"] {
  color: var(--ep-gold-light);
}
.reader-tools__track-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.reader-tools__eq {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: flex-end;
  column-gap: 2px;
  height: 12px;
  opacity: 0;
}
.reader-tools__eq > i {
  display: block;
  width: 2px;
  height: 100%;
  background-color: currentColor;
  transform: scaleY(0.4);
  transform-origin: bottom;
}
.reader-tools__track[aria-pressed="true"] .reader-tools__eq {
  opacity: 1;
}
/* 読み込み中：棒が淡く明滅する */
.reader-tools__track.is-loading .reader-tools__eq {
  opacity: 0.6;
}
.reader-tools__track.is-loading .reader-tools__eq > i {
  animation: ep-eq-wait 0.9s ease-in-out infinite alternate;
}
.reader-tools__track.is-loading .reader-tools__eq > i:nth-child(2) {
  animation-delay: 0.15s;
}
.reader-tools__track.is-loading .reader-tools__eq > i:nth-child(3) {
  animation-delay: 0.3s;
}
@keyframes ep-eq-wait {
  from {
    opacity: 0.25;
  }
  to {
    opacity: 1;
  }
}
@media (prefers-reduced-motion: no-preference) {
  .reader-tools__track[aria-pressed="true"] .reader-tools__eq > i,
  .reader-tools.is-playing .reader-tools__badge > i {
    animation: ep-eq 1.1s ease-in-out infinite alternate;
  }
  .reader-tools__track[aria-pressed="true"] .reader-tools__eq > i:nth-child(2),
  .reader-tools.is-playing .reader-tools__badge > i:nth-child(2) {
    animation-duration: 0.8s;
    animation-delay: -0.4s;
  }
  .reader-tools__track[aria-pressed="true"] .reader-tools__eq > i:nth-child(3),
  .reader-tools.is-playing .reader-tools__badge > i:nth-child(3) {
    animation-duration: 1.3s;
    animation-delay: -0.7s;
  }
}
@keyframes ep-eq {
  from {
    transform: scaleY(0.3);
  }
  to {
    transform: scaleY(1);
  }
}

/*------------------------------------------------------------------------------
手引き（補助メニューから開くダイアログの中身）
------------------------------------------------------------------------------*/
.ep-guide__head {
  flex: 0 0 auto;
  padding: 24px calc(var(--dialog-gutter) + 52px) 0 var(--dialog-gutter);
}
/* どの話の手引きか */
.ep-guide__context {
  display: flex;
  align-items: baseline;
  column-gap: 12px;
  min-height: 24px;
  margin: 8px 0 0;
  color: var(--ep-ink-soft);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.08em;
}
.ep-guide__context-no {
  flex: 0 0 auto;
  color: var(--ep-gold);
  letter-spacing: 0.16em;
}
.ep-guide__context-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
/* 登場人物｜用語 の切り替え */
.ep-guide__tabs {
  display: flex;
  column-gap: 34px;
  margin: 18px 0 0;
  border-bottom: 1px solid var(--ep-rule);
}
.ep-guide__tab {
  position: relative;
  display: grid;
  row-gap: 4px;
  padding: 6px 2px 14px;
  color: var(--ep-ink-soft);
  font: inherit;
  text-align: left;
  background: none;
  border: 0;
  cursor: pointer;
  transition: color 0.3s ease;
}
.ep-guide__tab::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 1px;
  background-color: var(--ep-gold);
  transform: scaleX(0);
  transition: transform 0.45s var(--ep-ease);
}
.ep-guide__tab:hover {
  color: var(--lv-color-white);
}
.ep-guide__tab[aria-selected="true"] {
  color: var(--lv-color-white);
}
.ep-guide__tab[aria-selected="true"]::after {
  transform: scaleX(1);
}
.ep-guide__tab:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 1px var(--ep-gold);
}
.ep-guide__tab-en {
  color: rgba(var(--lv-gold-rgb), 0.8);
  font-size: 9.5px;
  line-height: 1;
  letter-spacing: 0.3em;
}
.ep-guide__tab-ja {
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: 0.14em;
}
.ep-guide__tab-count {
  position: absolute;
  top: 2px;
  right: -16px;
  color: var(--ep-gold);
  font-size: 10px;
  letter-spacing: 0.06em;
}
.ep-guide__scroll {
  padding: 4px var(--dialog-gutter) calc(36px + env(safe-area-inset-bottom, 0px));
}
.ep-guide__section[hidden] {
  display: none;
}
.ep-guide__title {
  display: grid;
  row-gap: 6px;
  margin: 18px 0 4px;
  font-weight: normal;
}
.ep-guide__title-en {
  color: var(--ep-gold);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.3em;
}
.ep-guide__title-ja {
  font-size: 20px;
  line-height: 1.4;
  letter-spacing: 0.14em;
}
/* タブがある場合、見出しは読み上げ用だけにする（タブが見出しを兼ねる） */
.ep-guide--tabs .ep-guide__title {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.ep-guide__list {
  margin: 0;
}
.ep-guide__item {
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--ep-rule);
}
.ep-guide__item:last-child {
  border-bottom: 0;
}
.ep-guide__term {
  display: flex;
  align-items: center;
  column-gap: 10px;
  color: var(--ep-gold-light);
  font-size: 15px;
  font-weight: bold;
  line-height: 1.5;
  letter-spacing: 0.1em;
}
.ep-guide__term::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  background-color: var(--ep-gold);
  transform: rotate(45deg);
}
.ep-guide__description {
  margin: 8px 0 0 15px;
  color: rgba(242, 246, 250, 0.86);
  font-size: 14px;
  line-height: 1.95;
  letter-spacing: 0.05em;
}
.ep-guide__text {
  margin: 18px 0 0;
  color: rgba(242, 246, 250, 0.86);
  font-size: 14px;
  line-height: 2;
}
/* 項目は上から順に、そっと現れる（開いたとき・切り替えたとき） */
@media (prefers-reduced-motion: no-preference) {
  .ep-guide__section.is-current .ep-guide__item,
  .ep-guide__section.is-current .ep-guide__text {
    animation: ep-rise 0.6s var(--ep-ease) both;
    animation-delay: calc(var(--i, 0) * 0.04s + 0.08s);
  }
}
@keyframes ep-rise {
  from {
    opacity: 0;
    transform: translate3d(0, 10px, 0);
  }
}

/*------------------------------------------------------------------------------
本文中の用語と、その吹き出し（狭い画面は画面の下に出す）
------------------------------------------------------------------------------*/
.term--link {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: rgba(var(--lv-gold-rgb), 0.75);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
  cursor: pointer;
  transition: color 0.25s ease;
}
.term--link:hover,
.term--link[aria-expanded="true"] {
  color: var(--ep-gold-light);
}
button.term--link {
  display: inline;
  padding: 0;
  font: inherit;
  line-height: inherit;
  background: transparent;
  border: 0;
  -webkit-appearance: none;
  appearance: none;
}
.term--link:focus-visible {
  outline: 1px solid var(--ep-gold) !important;
  outline-offset: 0.15em;
}
.episode__term-popover {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1150;
  max-height: min(60vh, 360px);
  padding: 22px max(5.2vw, 20px) calc(22px + env(safe-area-inset-bottom, 0px));
  overflow: auto;
  color: var(--lv-color-white);
  background-color: var(--ep-ground);
  border-top: 1px solid var(--ep-line);
  box-shadow: 0 -16px 40px rgba(0, 0, 0, 0.4);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(100%);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0s linear 0.25s;
}
.episode__term-popover.is-open {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  transition:
    opacity 0.3s ease,
    transform 0.5s var(--ep-ease);
}
.episode__term-title {
  display: flex;
  align-items: center;
  column-gap: 10px;
  margin: 0 0 8px;
  color: var(--ep-gold-light);
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: 0.1em;
}
.episode__term-title::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  background-color: var(--ep-gold);
  transform: rotate(45deg);
}
.episode__term-description {
  display: block;
  margin: 0;
  color: rgba(242, 246, 250, 0.86);
  font-size: 13.5px;
  line-height: 1.9;
}

/*------------------------------------------------------------------------------
768px 以下：下へ読み進める間は、本文に重なる左下（目次）と右下（補助メニュー）のボタンを下へ退かせる。
少し上へ戻ると現れる。窓を開いている間は退かない（js/main.js の initReadingTuck）
------------------------------------------------------------------------------*/
@media (max-width: 768px) {
  .ep-index-toggle {
    transition:
      border-color 0.3s ease,
      opacity 0.4s ease,
      transform 0.6s var(--ep-ease);
  }
  .reader-tools {
    transition:
      opacity 0.4s ease,
      transform 0.6s var(--ep-ease);
  }
  .is-reading-tucked .ep-index-toggle[aria-expanded="false"],
  .is-reading-tucked .reader-tools:not(.is-open) {
    opacity: 0;
    transform: translate3d(0, 20px, 0);
    pointer-events: none;
  }
}

/*------------------------------------------------------------------------------
769px 以上：目次のボタンと補助メニューは、画面の隅から少し余白をとる（二つの高さをそろえる）。
目次は、狭い画面と同じく左から引き出す。
用語の吹き出しは、押した語の上（入らなければ下）に出る（位置は js/episode.js）
------------------------------------------------------------------------------*/
@media (min-width: 769px) {
  .ep-index-toggle {
    bottom: 28px;
    left: 28px;
    height: 52px;
    padding: 0 22px 0 20px;
    border-radius: 26px;
  }
  .ep-index {
    width: 380px;
    background-image: url(../img/bg-black-pc.webp);
  }
  .ep-index__head {
    padding: 32px 80px 18px 26px;
  }
  .ep-index__close {
    top: 24px;
    right: 20px;
  }
  .ep-index__link {
    padding: 15px 24px 16px 28px;
  }
  .ep-index__title {
    font-size: 15px;
  }
  .reader-tools {
    right: 28px;
    bottom: 28px;
  }
  .reader-tools__panel {
    width: 300px;
  }
  .episode__term-popover {
    right: auto;
    bottom: auto;
    width: max-content;
    max-width: 380px;
    max-height: 60vh;
    padding: 18px 22px;
    border: 1px solid var(--ep-line);
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
    transform: translate(-50%, calc(-100% + 6px));
    scrollbar-width: none;
  }
  .episode__term-popover.is-open {
    transform: translate(-50%, -100%);
  }
  .episode__term-popover.is-below {
    transform: translate(-50%, 6px);
  }
  .episode__term-popover.is-below.is-open {
    transform: translate(-50%, 0);
  }
  /* 吹き出しの先（押した語を指す菱形） */
  .episode__term-popover::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 9px;
    height: 9px;
    margin-left: -4.5px;
    background-color: var(--lv-color-navy);
    border-right: 1px solid var(--ep-line);
    border-bottom: 1px solid var(--ep-line);
    transform: rotate(45deg);
  }
  .episode__term-popover.is-below::after {
    top: -5px;
    bottom: auto;
    border: 0;
    border-top: 1px solid var(--ep-line);
    border-left: 1px solid var(--ep-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ep-index,
  .ep-index.is-open,
  .reader-tools__panel,
  .reader-tools__panel.is-visible {
    transition-duration: 0.01s;
  }
  .is-reading-tucked .ep-index-toggle[aria-expanded="false"],
  .is-reading-tucked .reader-tools:not(.is-open) {
    transform: none;
  }
}