/* ===== 書斎（index.html だけ）: 部屋・天井・机・本・紙片・幕板・body.page-room のヘッダー／フッターの皮・プレイ中の延長・4 テーマの差分 =====
   Builder B が書く。土台（フォント・トークン・全ページの見出し／ナビ／ボタン）は fonts.css・tokens.css・brand.css。
   色・寸法はトークンだけ（tokens.css）。場面の絵は焼いた WebP（assets/images/room、scripts/room-art/render.mjs）。
   昼 = light／paper、夜 = dark／indigo（html[data-theme]）。動きは夜のろうそくの明滅 1 つだけ（prefers-reduced-motion で止める）。
   振る舞い（id・class・body の状態クラス）は変えない。html[data-theme] .page-room を頭に付けて brand.css／layout.css に後勝ちする。 */

/* ---- 部屋の中の文字: 明朝（--font-display）。打つ画面（#gameCard）と設定の表は --font-ui のまま ---- */
html[data-theme] .page-room :is(#welcome, .app--home, #bookshelf, .room__stage) {
  font-family: var(--font-display);
  font-weight: 500;
  font-variant-numeric: lining-nums proportional-nums;
}

html[data-theme] .page-room :is(#gameCard, #setupPanel, .stats--strip, .home-more__body) {
  font-family: var(--font-ui);
  font-weight: 400;
}

.page-room .n,
.page-room .tcy {
  font-family: var(--font-num);
  font-variant-numeric: lining-nums proportional-nums;
}

.page-room .lat {
  font-family: var(--font-latin);
  font-weight: 600;
  letter-spacing: 0.02em;
  font-size: 1.12em;
}

.page-room .nb {
  white-space: nowrap;
}

/* 羽根ペン（インライン SVG）の色 */
.page-room {
  --s-quill: #EEE8DA;
  --s-quill-lit: #FBF8F0;
  --s-quill-dk: #ADA492;
  --s-quill-rachis: #9D9381;
  --s-ink-liquid: #0E1018;
  /* 頁の上の光と、夜のろうそくの照り返し（夜だけ値が入る） */
  --far-page: rgba(70, 50, 25, 0);
  --cast-l: rgba(255, 190, 110, 0);
  /* PC の机: 場面の下の天板の縁に落ちる窓の光（夜はろうそくの淡い暖かさ） */
  --desk-band: rgba(255, 240, 216, 0.3);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .page-room {
  --s-quill: #D2BE9C;
  --s-quill-lit: #F6E0B4;
  --s-quill-dk: #6E604C;
  --s-quill-rachis: #8A7A60;
  --far-page: rgba(70, 40, 12, 0.1); /* 390 はこのまま（目次は炎から 1000px 下で、これ以上沈めると墨が 4.5:1 を切る）。見開きの PC は 1100px 以上の節で深く */
  --cast-l: rgba(255, 176, 96, 0.26); /* 左頁の綴じ目の上（炎の側）を暖かく */
  --desk-band: rgba(255, 190, 120, 0.12);
}

/* 床の色はキャンバス（html）に: css/brand.css の html[data-theme] { background: var(--floor) }（全ページ共通）。body は紙のまま */

/* ================= ヘッダー: 天井の藍の上に透明で載る（高さ 56px のまま。E2E: < 70px） ================= */
html[data-theme] .page-room .site-header {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 20;
  background: transparent;
  border: 0;
}

html[data-theme] .page-room .brand,
html[data-theme] .page-room .brand__name {
  color: var(--foil);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.55);
}

html[data-theme] .page-room .site-header .brand__mark {
  border-color: rgba(230, 200, 135, 0.7);
  color: var(--foil);
  text-shadow: none;
}

html[data-theme] .page-room .site-nav__link {
  color: var(--on-vault);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.45);
}

html[data-theme] .page-room .site-nav__link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--foil);
}

html[data-theme] .page-room .site-nav__link[aria-current="page"] {
  color: var(--foil);
}

html[data-theme] .page-room .site-nav__link[aria-current="page"]::after {
  background: var(--foil);
}

html[data-theme] .page-room .account .btn--ghost {
  color: var(--on-vault);
  border-color: rgba(232, 220, 194, 0.5);
}

html[data-theme] .page-room .account .btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--foil);
}

/* 連続日数: 「30日」。数字は Cormorant、炎は 1px の金の線画。丸い札（brand.css）は部屋では外す（天井の上に直に置く） */
html[data-theme] .page-room .header-streak {
  align-items: baseline; /* 「30日」は同じベースラインに */
  gap: 2px;
  padding: 4px 4px;
  border: 0;
  border-radius: 0;
  color: var(--foil);
  font-size: 19px;
  line-height: 1;
  font-variant-numeric: lining-nums proportional-nums;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.55);
}

html[data-theme] .page-room .header-streak .icon,
html[data-theme] .page-room .header-streak--off .icon {
  width: 15px;
  height: 15px;
  margin-right: 1px;
  color: var(--foil);
}

html[data-theme] .page-room .header-streak span {
  display: inline; /* スマホでも「30日」で読む（数字だけになるのは 359px 以下だけ。下の 359px の箱） */
  margin-left: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--on-vault-2);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
}

html[data-theme] .page-room .header-streak:hover {
  color: #F6E2A8;
}

html[data-theme] .page-room .header-streak--off {
  color: var(--on-vault-2);
}

/* ================= 部屋（壁・天井・光） ================= */
.room {
  --vault-h: 100px;
  --stage-h: 262px;
  --desk-top: 240px;
  --sx: calc(50% - 195px);
  position: relative;
  isolation: isolate;
  overflow: clip; /* clip: 机の列の sticky を殺さない */
  flex: 1;
  padding-top: env(safe-area-inset-top, 0px);
  background-color: var(--stone);
  background-image:
    linear-gradient(to bottom, transparent 0, transparent 900px, rgba(30, 30, 34, 0.3) 1300px, rgba(30, 30, 34, 0.52) 100%),
    url(../assets/images/room/ashlar.svg),
    url(../assets/images/room/tile-stone.webp),
    url(../assets/images/room/tile-plaster.webp),
    linear-gradient(100deg, rgba(255, 250, 240, 0.08), rgba(255, 250, 240, 0) 38%, rgba(30, 32, 40, 0.04) 100%),
    linear-gradient(to bottom, var(--stone-lit) 0, var(--stone) 320px, var(--stone) 820px, var(--stone-sh) 1400px);
  background-size: auto, 720px 356px, 320px 320px, 384px 384px, auto, auto;
  background-position: 0 0, calc(50% - 40px) 4px, 0 0, 0 0, 0 0, 0 0;
  background-blend-mode: normal, normal, soft-light, soft-light, normal, normal;
}

html:is([data-theme="dark"], [data-theme="indigo"]) .room {
  background-image:
    linear-gradient(to bottom, transparent 0, transparent 700px, rgba(0, 0, 0, 0.3) 1100px, rgba(0, 0, 0, 0.55) 100%),
    url(../assets/images/room/ashlar-dark.svg),
    url(../assets/images/room/tile-stone.webp),
    linear-gradient(to bottom, var(--stone-lit) 0, var(--stone) 300px, var(--stone-sh) 900px);
  background-size: auto, 720px 356px, 320px 320px, auto;
  background-blend-mode: normal, normal, soft-light, normal;
}

/* 天井: 藍の漆喰に金の星図。スマホでは半月形の壁（ルネット）の外に見え、石の肋が縁取る */
.room__vault {
  position: absolute;
  z-index: 0;
  inset: 0 0 auto 0;
  height: calc(var(--vault-h) + env(safe-area-inset-top, 0px));
  background-image: url(../assets/images/room/tile-plaster.webp), linear-gradient(to bottom, var(--vault), var(--vault-2));
  background-size: 384px 384px, auto;
  background-blend-mode: soft-light, normal;
  -webkit-mask: url(../assets/images/room/lunette.svg) 0 0 / 100% 100% no-repeat;
  mask: url(../assets/images/room/lunette.svg) 0 0 / 100% 100% no-repeat;
}

.room__vault::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url(../assets/images/room/vault.svg) center bottom / auto 150px no-repeat;
  opacity: 0.78;
  /* ヘッダーの文字の後ろでは星図の線を薄く */
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.22) 0, rgba(0, 0, 0, 0.22) 50px, #000 72px);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.22) 0, rgba(0, 0, 0, 0.22) 50px, #000 72px);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .room__vault::before {
  opacity: 0.5;
}

/* 肋: 4 段の繰形（持ち送りは出さない。壁に柔らかな影） */
.room__rib {
  position: absolute;
  z-index: 1;
  inset: 0 0 auto 0;
  height: calc(var(--vault-h) + env(safe-area-inset-top, 0px));
  pointer-events: none;
  background: url(../assets/images/room/rib.svg) 0 0 / 100% 100% no-repeat;
}

html:is([data-theme="dark"], [data-theme="indigo"]) .room__rib {
  background-image: url(../assets/images/room/rib-dark.svg);
}

/* 周辺減光: 右と下の隅を 13% ほど沈める */
.room__vignette {
  position: absolute;
  z-index: 1;
  pointer-events: none;
  inset: 0 0 auto 0;
  height: 980px;
  mix-blend-mode: multiply;
  -webkit-mask-image: linear-gradient(#000 60%, transparent 92%);
  mask-image: linear-gradient(#000 60%, transparent 92%);
  background: radial-gradient(ellipse 85% 70% at 32% 46%, transparent 40%, var(--vignette) 100%);
}

.room__in {
  position: relative;
}

/* ================= 机の列: 部屋の帯（場面）＋机＋本 ================= */
.nook {
  position: relative;
}

.room__stage {
  position: relative;
  height: var(--stage-h);
}

/* 場面: 焼いた WebP。表示する 1 枚だけが読まれる（display:none の背景は取りに行かない） */
.room__scene {
  position: absolute;
  z-index: 2;
  top: 0;
  left: var(--sx);
  pointer-events: none;
  background: no-repeat 0 0 / 100% 100%;
}

.room__scene--phone {
  width: 390px;
  height: 262px;
  background-image: url(../assets/images/room/scene-phone-light.webp);
}

/* 表示しない場面には画像を与えない（display:none でも Chrome は背景画像を取りに行く）。幅と高さの分岐（下の @media）で 1 枚だけに URL を付ける */
.room__scene--short {
  display: none;
  width: 390px;
  height: 194px;
}

.room__scene--desk {
  display: none;
  width: 640px;
  height: 430px;
}

html:is([data-theme="dark"], [data-theme="indigo"]) .room__scene--phone { background-image: url(../assets/images/room/scene-phone-dark.webp); }

/* 光の溜まり（非線形の減衰）。中心は場面の座標（scripts/room-art/scene.mjs の窓・炎） */
.room__pool {
  position: absolute;
  z-index: 1;
  pointer-events: none;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.room__pool--win {
  left: calc(var(--sx) + 154px);
  top: 178px;
  width: 640px;
  height: 580px;
  mix-blend-mode: screen;
  background: radial-gradient(closest-side, rgba(252, 248, 236, 0.44) 0%, rgba(252, 248, 236, 0.34) 10%, rgba(252, 248, 236, 0.2) 26%, rgba(252, 248, 236, 0.08) 48%, rgba(252, 248, 236, 0.02) 72%, transparent 100%);
}

.room__pool--candle {
  display: none;
  left: calc(var(--sx) + 180px);
  top: 206px;
}

html:is([data-theme="dark"], [data-theme="indigo"]) .room__pool--win {
  width: 340px;
  height: 400px;
  background: radial-gradient(closest-side, rgba(120, 140, 210, 0.16), rgba(120, 140, 210, 0.06) 45%, transparent 100%);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .room__pool--candle {
  display: block;
  width: 760px;
  height: 760px;
  mix-blend-mode: screen;
  background: radial-gradient(closest-side, rgba(255, 186, 100, 0.62) 0%, rgba(255, 170, 88, 0.44) 5%, rgba(250, 150, 72, 0.27) 12%, rgba(236, 128, 58, 0.14) 24%, rgba(220, 110, 50, 0.06) 42%, rgba(210, 100, 46, 0.02) 66%, transparent 100%);
  animation: room-flicker 4.2s infinite;
}

/* 昼の光の筋: 窓から壁と机の天板へ落ちる（CSS の勾配。塵は入れない。夜は消す）。
   机の天板の線（--desk-top）で切る: 本の表紙には掛けない（頁の上の光は .tome__page--l の --page-hot が担う） */
.room__shaft {
  position: absolute;
  z-index: 5;
  top: 0;
  left: var(--sx);
  width: 390px;
  height: var(--desk-top);
  overflow: hidden;
  pointer-events: none;
  mix-blend-mode: screen;
}

.room__shaft::before,
.room__shaft::after {
  content: "";
  position: absolute;
  left: 109px;
  top: 147px;
  width: 310px;
  height: 72px;
  transform-origin: 0 50%;
  transform: rotate(38.4deg);
  background: linear-gradient(90deg, rgba(255, 241, 214, 0.34) 0, rgba(255, 241, 214, 0.2) 35%, rgba(255, 241, 214, 0.08) 65%, rgba(255, 241, 214, 0) 100%);
  filter: blur(4px);
}

.room__shaft::after {
  left: 78px;
  top: 203px;
  width: 280px;
  height: 24px;
  transform: rotate(40.2deg);
  background: linear-gradient(90deg, rgba(255, 241, 214, 0.26) 0, rgba(255, 241, 214, 0.14) 35%, rgba(255, 241, 214, 0.05) 65%, rgba(255, 241, 214, 0) 100%);
  filter: blur(3px);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .room__shaft {
  display: none;
}

/* ---- はちゃんの紙片: 窓の脇に真鍮の鋲で留める（少し反って、鋲の影が落ちる）。彼女本人は絵の中（窓辺で本を読んでいる） ---- */
html[data-theme] .page-room .hasumi--home {
  position: absolute;
  z-index: 3;
  left: calc(var(--sx) + 148px);
  top: 100px;
  margin: 0;
  display: block;
  gap: 0;
  filter: drop-shadow(1px 2px 1.5px rgba(var(--shadow-rgb), 0.35)) drop-shadow(5px 8px 8px rgba(var(--shadow-rgb), 0.2));
}

html[data-theme] .page-room .hasumi--home:empty {
  display: none;
}

html[data-theme] .page-room .hasumi--home::after {
  /* 真鍮の鋲 */
  content: "";
  position: absolute;
  left: 50%;
  top: 4px;
  width: 7px;
  height: 7px;
  margin-left: -3.5px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #FBE9B4 0, #D8B66E 30%, #8A6A30 70%, #3E2C12 100%);
  box-shadow: 0.5px 1px 1px rgba(0, 0, 0, 0.45), 2px 3px 2px -1px rgba(var(--shadow-rgb), 0.3);
}

html[data-theme] .page-room .hasumi--home .slip {
  position: relative;
  margin: 0;
  width: max-content;
  min-width: 112px;
  max-width: 166px; /* 句読点のあとで折って 9 字（5分だけ、いこう。= 実測 137px）が 1 行に入る幅（中身 142px） */
  padding: 15px 11px 11px 13px;
  transform: rotate(-1.6deg);
  word-break: keep-all; /* 折るのは句読点のあと（<wbr>）だけ */
  overflow-wrap: normal; /* 「。」だけを次の行に落とさない（anywhere だと禁則より溢れ防止が勝つ） */
  line-break: strict;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  font: 500 15.5px/1.6 var(--font-display);
  letter-spacing: 0.02em;
  color: var(--ink-page-2);
  font-feature-settings: "palt";
  text-wrap: balance; /* pretty は行数を増やして「、」でも折る。balance は行数を増やさずに行の長さだけそろえる（おかえり。／5分だけ、いこう。） */
  background:
    linear-gradient(160deg, rgba(255, 253, 244, 0.22) 0, rgba(255, 253, 244, 0) 32%),
    linear-gradient(to bottom, transparent 66%, rgba(90, 70, 40, 0.12) 100%),
    linear-gradient(90deg, transparent 80%, rgba(90, 70, 40, 0.08) 100%),
    radial-gradient(ellipse at 50% 4px, rgba(60, 40, 20, 0.2), transparent 18px),
    url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px,
    #E4DAC4;
  background-blend-mode: normal, normal, normal, normal, soft-light, normal;
  clip-path: polygon(0% 3%, 7% 1%, 15% 2.5%, 24% 0.5%, 33% 2%, 41% 0%, 52% 1.8%, 60% 0.4%, 69% 2.2%, 78% 0.6%, 87% 2%, 94% 0.3%, 100% 2.4%, 99.2% 14%, 100% 30%, 99% 47%, 100% 63%, 99.3% 80%, 99% 94%, 96% 99.4%, 88% 97.6%, 75% 99.6%, 66% 98%, 57% 100%, 47% 98.2%, 38% 99.8%, 29% 98%, 20% 99.6%, 11% 97.8%, 3% 99.4%, 0% 96%, 0.8% 80%, 0% 64%, 0.6% 47%, 0% 30%, 0.7% 15%);
}

html[data-theme] .page-room .hasumi--home .slip--long {
  max-width: 164px;
  margin-left: -14px; /* 長い文は少し窓の側へ（額に重ならない） */
  font-size: 14.5px;
  line-height: 1.5;
  letter-spacing: 0.03em;
}

html:is([data-theme="dark"], [data-theme="indigo"]) .page-room .hasumi--home {
  filter: drop-shadow(1px -1px 1.5px rgba(0, 0, 0, 0.5)) drop-shadow(6px -6px 9px rgba(0, 0, 0, 0.45));
}

html:is([data-theme="dark"], [data-theme="indigo"]) .page-room .hasumi--home .slip {
  background: linear-gradient(to top, rgba(255, 170, 86, 0.3) 0, rgba(255, 170, 86, 0.08) 50%, rgba(0, 0, 0, 0.18) 100%), url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px, #A48C66;
  background-blend-mode: normal, soft-light, normal;
  color: #1A120C;
}

/* ================= 机: 天板（上から見た胡桃の横の木目。木目は 58% 鈍らせて、2 段の勾配で奥へ沈む）→ 手前の縁（光る唇）→ 幕板 ================= */
.desk {
  position: relative;
  margin-top: calc(var(--desk-top) - var(--stage-h));
  padding: 16px 12px 20px;
  background:
    linear-gradient(to bottom, rgba(20, 12, 6, 0.62) 0, rgba(20, 12, 6, 0) 2px),
    linear-gradient(to bottom, rgba(var(--shadow-rgb), 0.42) 0, rgba(var(--shadow-rgb), 0) 14px),
    radial-gradient(ellipse 70% 220px at 18% 0, rgba(255, 246, 228, 0.2), transparent 100%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.16), transparent 16%, transparent 84%, rgba(0, 0, 0, 0.2)),
    linear-gradient(to bottom, color-mix(in srgb, var(--wood-top) 58%, transparent), color-mix(in srgb, var(--wood) 58%, transparent) 70%, color-mix(in srgb, var(--wood-2) 58%, transparent)),
    url(../assets/images/room/tile-wood.webp) 0 0 / 640px 256px,
    linear-gradient(to bottom, var(--wood-top), var(--wood) 70%, var(--wood-2));
  background-blend-mode: normal, normal, normal, normal, normal, soft-light, normal;
}

/* 机の上の全幅ラッパーを打ち消す（layout.css の .app・responsive.css） */
html[data-theme] .page-room .app--home {
  width: auto;
  max-width: none;
  margin: 0;
  padding: 0;
  flex: none;
}

html[data-theme] .page-room .app--home .hero {
  display: none;
}

html[data-theme] .page-room .auth-message--home {
  margin: 0 auto 10px;
  max-width: 560px;
  min-height: 0;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--on-vault);
}

html[data-theme] .page-room .auth-message--home:empty {
  display: none;
}

/* 手前の縁と幕板（ほかの遊び方の 1 行） */
.desk__front {
  position: relative;
  margin: 20px -12px -20px;
  padding: 13px 16px 14px;
  text-align: center;
  background:
    linear-gradient(to bottom, rgba(0, 0, 0, 0.35) 0, rgba(0, 0, 0, 0.35) 1px, rgba(255, 232, 196, 0.42) 1px, rgba(255, 232, 196, 0.16) 3px, rgba(0, 0, 0, 0) 4px),
    linear-gradient(to bottom, transparent 4px, rgba(0, 0, 0, 0.45) 4px, rgba(0, 0, 0, 0) 12px),
    linear-gradient(to bottom, transparent 5px, rgba(201, 163, 90, 0.5) 5px, rgba(201, 163, 90, 0.5) 6px, transparent 6px),
    linear-gradient(rgba(30, 20, 12, 0.22), rgba(30, 20, 12, 0.22)),
    url(../assets/images/room/tile-wood.webp) 37px 0 / 640px 256px,
    linear-gradient(to bottom, var(--wood-2), var(--wood-3));
  background-blend-mode: normal, normal, normal, normal, soft-light, normal;
  box-shadow: 0 12px 16px -8px rgba(0, 0, 0, 0.6);
}

.desk__front::after {
  /* 机の下（膝の入る奥）は陰に沈む */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 110px;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(var(--shadow-rgb), 0.55), rgba(var(--shadow-rgb), 0.18) 50%, rgba(var(--shadow-rgb), 0));
}

html:is([data-theme="dark"], [data-theme="indigo"]) .desk__front::after {
  /* 夜の机の下は炎が届かない（前板の唇は昼の勾配のまま） */
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.25) 50%, rgba(0, 0, 0, 0));
}

/* 机の下: ログインの案内と「覚えた単語」（静かな 2 枚の紙） */
.desk__under {
  position: relative;
  z-index: 1;
  max-width: 560px;
  margin: 0 auto;
  padding: 36px 4px 8px;
}

.desk__under:empty {
  display: none;
}

html[data-theme] .page-room .login-nudge {
  color: var(--on-vault-2);
  letter-spacing: 0.04em;
}

html[data-theme] .page-room .login-nudge__text a,
html[data-theme] .page-room .login-nudge__later {
  color: var(--on-vault);
  text-decoration-color: rgba(230, 200, 135, 0.6);
}

html[data-theme] .page-room .home-more {
  border-top: 0;
  margin-bottom: 8px;
}

html[data-theme] .page-room .home-more > summary {
  color: var(--on-vault-2);
  letter-spacing: 0.08em;
}

html[data-theme] .page-room .home-more > summary:hover {
  color: var(--on-vault);
}

html[data-theme] .page-room .home-more > summary::after {
  color: var(--on-vault-2);
}

/* 夜: ろうそくの光が机と本に落ちる（炎を中心に非線形の減衰）。暖かい光（soft-light）と、遠い所の暗がり（multiply）。スタートより下の層 */
.desk__candle {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  --fx: calc(50% - 195px + 180px);
  --fy: -34px;
}

html:is([data-theme="dark"], [data-theme="indigo"]) .desk__candle--l {
  display: block;
  mix-blend-mode: soft-light;
  background: radial-gradient(circle at var(--fx) var(--fy), rgba(255, 176, 92, 0.95) 0, rgba(255, 168, 84, 0.7) 70px, rgba(250, 150, 70, 0.4) 150px, rgba(240, 130, 60, 0.16) 260px, rgba(230, 120, 50, 0.04) 400px, transparent 520px);
  clip-path: circle(520px at var(--fx) var(--fy)); /* 光は 520px で透明になる: 混ぜ合わせ（soft-light）を毎フレーム机いっぱいにしない */
  will-change: opacity;
  animation: room-flicker 4.2s infinite; /* 壁の溜まり（.room__pool--candle）と同じ名前・長さ・遅延なし＝同位相。陰（--s）は揺らさない */
}

html:is([data-theme="dark"], [data-theme="indigo"]) .desk__candle--s {
  display: block;
  mix-blend-mode: multiply;
  background: radial-gradient(circle at var(--fx) var(--fy), transparent 0, transparent 220px, rgba(30, 16, 6, 0.1) 360px, rgba(20, 10, 4, 0.22) 540px, rgba(14, 7, 3, 0.34) 780px);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .desk__front,
html:is([data-theme="dark"], [data-theme="indigo"]) .pile,
html:is([data-theme="dark"], [data-theme="indigo"]) .desk__under {
  z-index: 6;
}

/* ================= 机の上の本（スマホ: 頁を縦に積む） ================= */
.tome {
  position: relative;
  z-index: 3;
  max-width: 560px;
  margin: 0 auto;
  padding: 10px 10px 13px;
  border-radius: var(--radius-room);
  background:
    radial-gradient(circle at 0 0, rgba(255, 240, 214, 0.2), transparent 13px),
    radial-gradient(circle at 100% 0, rgba(255, 240, 214, 0.14), transparent 13px),
    radial-gradient(circle at 0 100%, rgba(255, 240, 214, 0.14), transparent 13px),
    radial-gradient(circle at 100% 100%, rgba(255, 240, 214, 0.1), transparent 13px),
    radial-gradient(ellipse at 18% 0%, rgba(200, 214, 255, 0.16), transparent 55%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.25), rgba(255, 255, 255, 0) 30%, rgba(0, 0, 0, 0.2)),
    url(../assets/images/room/tile-leather.webp) 0 0 / 80px 80px,
    linear-gradient(160deg, var(--lapis-2), var(--lapis));
  background-blend-mode: normal, normal, normal, normal, normal, normal, soft-light, normal;
  /* 接地の影（きつく 1px）＋右下へ落ちる柔らかい影（光は左上の窓） */
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.55), 0 0 0 0.5px rgba(0, 0, 0, 0.6), 1px 2px 2px rgba(0, 0, 0, 0.45), 6px 12px 16px -6px rgba(var(--shadow-rgb), 0.55), 14px 26px 34px -16px rgba(var(--shadow-rgb), 0.5);
}

/* 表紙の金の細線は頁の下（z -1。.tome が重なりの文脈なので表紙の上には出る）。頁には z-index を付けない:
   頁の中のコース選択パネル（z 70）が目次の頁の下に沈まないように。開いている間は本ごと最前面（body.courses-open） */
.tome::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 4px;
  border: 0.75px solid rgba(230, 200, 135, 0.6);
  border-radius: 2px;
  pointer-events: none;
}

.tome::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 6.5px;
  border: 0.75px solid rgba(230, 200, 135, 0.26);
  border-radius: 1.5px;
  pointer-events: none;
}

/* 夜: 近い点光源（左上の炎）なので、机に落ちる影は長く・柔らかく・濃く（向きは昼と同じ右下。層の数は同じ）。表紙の金の細線は炎の側（上・左）が照る */
html:is([data-theme="dark"], [data-theme="indigo"]) .page-room .tome {
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.6), 0 0 0 0.5px rgba(0, 0, 0, 0.65), 2px 3px 3px rgba(0, 0, 0, 0.5), 10px 16px 18px -6px rgba(0, 0, 0, 0.6), 22px 40px 44px -16px rgba(0, 0, 0, 0.55);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .page-room .tome::before {
  border-color: rgba(240, 215, 158, 0.55);
  border-top-color: rgba(240, 215, 158, 0.85);
  border-left-color: rgba(240, 215, 158, 0.8);
}

html[data-theme] body.courses-open #pathCard {
  z-index: 70;
}

/* .room は isolation: isolate の重ね合わせ文脈なので、中の固定の暗幕（.path__courses-backdrop z 69）は外のヘッダー（z 20）を覆えない。
   開いている間だけ部屋ごとヘッダーより前に出す（旧ホームと同じく、暗幕がナビも覆い、ナビを押すと閉じる） */
html[data-theme] body.courses-open .room {
  z-index: 30;
}

.tome__block {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
}

.tome__page {
  position: relative;
  padding: 18px 20px;
  color: var(--ink-page);
  background:
    radial-gradient(ellipse 90% 70% at 12% 0%, var(--page-hot), transparent 70%),
    linear-gradient(var(--far-page), var(--far-page)),
    url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px 256px,
    var(--parchment);
  background-blend-mode: normal, normal, soft-light, normal;
  box-shadow: inset 0 0 30px rgba(120, 80, 30, 0.09);
}

/* スマホ: 上の頁（左頁）→ 右頁 → 目次の頁。綴じ目は頁のあいだの横の溝。小口の段が見える */
.tome__page--l {
  border-radius: 1px 1px 0 0;
  background-image: linear-gradient(200deg, var(--cast-l), transparent 60%), radial-gradient(ellipse 90% 70% at 12% 0%, var(--page-hot), transparent 70%), linear-gradient(to top, rgba(100, 70, 36, 0.3), rgba(100, 70, 36, 0.14) 8px, rgba(100, 70, 36, 0.05) 20px, rgba(100, 70, 36, 0) 36px), url(../assets/images/room/tile-paper-soft.webp);
  background-blend-mode: normal, normal, normal, soft-light;
  background-size: auto, auto, auto, 256px 256px;
  box-shadow: inset 0 0 30px rgba(120, 80, 30, 0.09), 0 -1px 0 #E9DFC8, 0 -2px 0 var(--parchment-gap), 0 -3px 0 #E4D8BE, 0 -4px 0 var(--parchment-gap), 1px 0 0 #E9DFC8, 2px 0 0 var(--parchment-gap), 3px 0 0 #E4D8BE;
}

.tome__page--r,
.tome__page--toc {
  background-image: linear-gradient(to bottom, rgba(100, 70, 36, 0.32), rgba(100, 70, 36, 0.15) 8px, rgba(100, 70, 36, 0.05) 20px, rgba(100, 70, 36, 0) 36px), url(../assets/images/room/tile-paper-soft.webp), linear-gradient(var(--far-page), var(--far-page));
  background-blend-mode: normal, soft-light, normal;
  background-size: auto, 256px 256px, auto;
}

/* 小口（右側の 3 本）: 縦に積んだ頁の右の縁が 1 本の小口に見える（3 頁とも同じ値。初回の 1 語体験の頁も）。1100px 以上は左右の段で丸ごと上書き */
.tome__page--r,
.tome__page--demo {
  box-shadow: inset 0 0 30px rgba(120, 80, 30, 0.09), 1px 0 0 #E9DFC8, 2px 0 0 var(--parchment-gap), 3px 0 0 #E4D8BE;
}

.tome__page--toc {
  border-radius: 0 0 1px 1px;
  box-shadow: inset 0 0 30px rgba(120, 80, 30, 0.09), 0 1px 0 #ECE2CB, 0 2px 0 var(--parchment-gap), 0 3px 0 #E5D9BF, 0 4px 0 var(--parchment-gap), 0 5px 0 #DED1B5, 0 6px 0 var(--parchment-gap), 0 7px 0 #D6C8AA, 1px 0 0 #E9DFC8, 2px 0 0 var(--parchment-gap), 3px 0 0 #E4D8BE;
}

.tome__page--r::before,
.tome__page--toc::before {
  /* 綴じ目から頁が立ち上がる細い光（ノド） */
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  top: 2px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 252, 240, 0.8) 18%, rgba(255, 252, 240, 0.8) 82%, transparent);
}

.tome__page--l::after,
.tome__page--r::after {
  /* ノドの谷: 線ではなく、両頁が暗くなる柔らかな溝 */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 4px;
  background: linear-gradient(to bottom, rgba(70, 48, 22, 0), rgba(70, 48, 22, 0.28) 50%, rgba(70, 48, 22, 0));
}

/* 柱: 金の細線 + 文字。線は 1px（スマホでも見える）。字頭は題とそろう */
.runhead {
  text-wrap: balance;
  word-break: keep-all;
  margin: 0 0 8px;
  font: 500 var(--fs-meta) / 1.5 var(--font-display);
  letter-spacing: 0.12em;
  color: var(--ink-page-3);
}

.runhead::before {
  content: "";
  display: inline-block;
  vertical-align: middle;
  width: 14px;
  height: 1px;
  margin: -2px 8px 0 0;
  background: linear-gradient(90deg, var(--gold-dk), var(--gold));
}

.runhead .n {
  letter-spacing: 0.04em;
  margin: 0 0.1em;
}

.tome__title {
  margin: 0;
  font: 500 var(--fs-title) / 1.3 var(--font-display);
  letter-spacing: 0.06em;
  font-feature-settings: "palt";
  color: var(--ink-page);
}

.tome__title .n {
  font-family: var(--font-num);
  font-weight: 600;
}

.tome__meta {
  margin: 4px 0 0;
  font: 500 var(--fs-small) / 1.7 var(--font-display);
  color: var(--ink-page-3);
  letter-spacing: 0.04em;
}

.tome__meta .n {
  font-size: 1.07em;
  color: var(--ink-page-2);
}

.progress {
  margin-top: 10px;
}

.progress__rule {
  position: relative;
  height: 5px;
}

.progress__rule::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 2px;
  height: 1px;
  background: rgba(42, 33, 25, 0.35);
}

.progress__rule i {
  position: absolute;
  left: 0;
  top: 1px;
  height: 3px;
  border-radius: 1px;
  background: linear-gradient(180deg, #F1D99C, #B98A3E 60%, #8A6A30);
  box-shadow: 0 0 0 0.5px rgba(62, 44, 18, 0.5);
}

.progress__rule i::after {
  content: "";
  position: absolute;
  right: -3px;
  top: -2px;
  width: 7px;
  height: 7px;
  background: linear-gradient(135deg, #F3D58A, #A97A32);
  transform: rotate(45deg);
  box-shadow: 0 0 0 0.5px rgba(62, 44, 18, 0.6);
}

.progress__txt {
  margin: 6px 0 0;
  font: 500 var(--fs-small) / 1.4 var(--font-display);
  color: var(--ink-page-3);
  letter-spacing: 0.06em;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

/* 数字は Cormorant（600 の 1 面だけなので 500 を指定しても同じ面。「／」の代替の明朝が 700 を読みに行かないように 500） */
.progress__txt b {
  font: 500 30px/1 var(--font-latin);
  color: var(--ink-page);
  letter-spacing: 0;
}

.progress__txt .of {
  font: 500 17px/1 var(--font-latin);
  color: var(--ink-page-2);
}

/* 右頁: 章のキッカー → 「仕事」の章 → 今日のセットの 1 行 → スタート（1 列。左端は頁の余白にそろえる） */
.chap__k {
  margin: 0;
  font: 500 var(--fs-meta) / 1.5 var(--font-display);
  letter-spacing: 0.12em;
  color: var(--ink-page-3);
}

.chap__k .n {
  font-size: 1.12em;
  color: var(--ink-page-2);
  letter-spacing: 0.04em;
}

.chap__t {
  margin: 2px 0 0;
  font: 500 var(--fs-h3) / 1.35 var(--font-display);
  letter-spacing: 0.04em;
  font-feature-settings: "palt";
  color: var(--ink-page);
}

.chap__q {
  color: var(--ink-page-3);
}

.todays {
  display: block;
  margin: 8px 0 0;
  font: 500 var(--fs-body) / 1.6 var(--font-display);
  color: var(--ink-page-2);
  letter-spacing: 0.02em;
  text-wrap: pretty;
}

.todays .n {
  font-size: 1.1em;
  color: var(--ink-page);
}

/* スタート: 朱漆の板。画面で唯一の朱。アイコンは付けない（textContent は「スタート」） */
.start {
  position: relative;
  z-index: 6;
  display: flex;
  width: 100%;
  height: 54px;
  margin: 16px 0 0;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--radius-room);
  cursor: pointer;
  color: var(--seal-ink);
  font: 700 20px/1 var(--font-display);
  letter-spacing: 0.16em;
  text-indent: 0.16em;
  background: linear-gradient(180deg, var(--seal-1) 0%, #B8361F 55%, var(--seal-2) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 220, 190, 0.35), inset 0 -1px 0 rgba(60, 10, 0, 0.4), 0 2px 0 rgba(60, 20, 10, 0.35), 0 8px 16px -6px rgba(60, 20, 10, 0.5);
  text-shadow: 0 -1px 0 rgba(90, 20, 5, 0.45);
  transition: transform 120ms, box-shadow 120ms;
}

.start::before {
  content: "";
  position: absolute;
  inset: 3px;
  border: 0.75px solid rgba(230, 200, 135, 0.55);
  border-radius: 2px;
  pointer-events: none;
}

.start:hover {
  background: linear-gradient(180deg, #CB4127 0%, #BC3820 55%, #AC321C 100%);
  color: var(--seal-ink);
}

.start:active {
  transform: translateY(1px);
  box-shadow: inset 0 1px 0 rgba(255, 220, 190, 0.3), inset 0 -1px 0 rgba(60, 10, 0, 0.4), 0 1px 0 rgba(60, 20, 10, 0.35), 0 4px 8px -4px rgba(60, 20, 10, 0.5);
}

.start:focus-visible {
  outline: 2px solid var(--ink-page);
  outline-offset: 3px;
}

/* 一覧と本棚へのリンク（押せる高さ 44px） */
.tome__links {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 4px 0 -8px;
}

.tome__links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font: 500 var(--fs-small) / 1 var(--font-display);
  letter-spacing: 0.06em;
  color: var(--ink-page-2);
  text-decoration: underline;
  text-decoration-color: rgba(169, 122, 50, 0.7);
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.tome__links a:hover {
  color: var(--ink-page);
  text-decoration-color: var(--gold-dk);
}

.tome__links .path__shelf-link::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-left: 8px;
  border-right: 1px solid var(--gold-dk);
  border-bottom: 1px solid var(--gold-dk);
  transform: translateY(-2px) rotate(45deg);
}

.tome__ribbon {
  position: absolute;
  z-index: 4;
  left: 70%;
  bottom: -34px;
  width: 9px;
  height: 56px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--lapis), var(--lapis-2) 30%, var(--lapis-3) 48%, var(--lapis-2) 64%, var(--lapis));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 88%, 0 100%);
  filter: drop-shadow(2px 3px 2px rgba(0, 0, 0, 0.4));
}

.tome__ribbon::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 2px);
}

.fore-quill {
  position: absolute;
  z-index: 4;
  pointer-events: none;
  right: 10px;
  top: -18px;
  width: 68px;
  height: 34px;
}

/* 出題の行（出題: … ・ 設定／机に戻る）: 本の足元の表紙の縁に、小さく */
html[data-theme] .page-room .play__bar {
  position: relative;
  z-index: 1;
  justify-content: flex-end;
  gap: 4px 12px;
  margin: 10px 0 -8px;
  padding: 0 6px;
}

html[data-theme] .page-room .setup-toggle,
html[data-theme] .page-room .setup-toggle__label {
  font-family: var(--font-display);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--on-vault-2);
}

html[data-theme] .page-room .setup-toggle__summary {
  color: var(--on-vault);
}

html[data-theme] .page-room .setup-toggle__sep {
  color: rgba(205, 191, 159, 0.6);
}

html[data-theme] .page-room .setup-toggle__more,
html[data-theme] .page-room .setup-toggle:hover .setup-toggle__more {
  color: var(--on-vault);
  text-decoration-color: rgba(230, 200, 135, 0.6);
  text-underline-offset: 4px;
}

html[data-theme] .page-room .setup-toggle--open .setup-toggle__more {
  color: var(--foil);
}

html[data-theme] .page-room .back-to-path {
  border-color: rgba(232, 220, 194, 0.45);
  color: var(--on-vault);
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: 0.06em;
}

html[data-theme] .page-room .back-to-path:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--foil);
}

/* ================= 幕板: ほかの遊び方（静かな 1 行。押せる高さ 44px） ================= */
html[data-theme] .page-room .play-modes {
  margin: 0;
  padding: 0;
  border: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0 6px;
  font: 500 14px/1.6 var(--font-display);
  letter-spacing: 0.06em;
  color: #D9CDB4;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.5);
}

html[data-theme] .page-room .play-modes__title {
  margin: 0 2px 0 0;
  font: inherit;
  letter-spacing: inherit;
  color: #DACEB6;
  white-space: nowrap;
}

html[data-theme] .page-room .play-modes__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

html[data-theme] .page-room .play-modes__row {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  border: 0;
  white-space: nowrap;
}

/* 区切りの「・」は前の項目の末尾に（2 行に折れても行頭に「・」が来ない。content は textContent に入らない） */
html[data-theme] .page-room .play-modes__row:not(:last-child)::after {
  content: "・";
  margin: 0 2px;
  color: #8E806A;
}

html[data-theme] .page-room .play-modes__go {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 4px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--on-vault);
  font: inherit;
  letter-spacing: inherit;
  text-decoration: underline;
  text-decoration-color: rgba(230, 200, 135, 0.55);
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
  cursor: pointer;
  box-shadow: none;
}

html[data-theme] .page-room .play-modes__go:hover {
  background: transparent;
  color: var(--foil);
  text-decoration-color: var(--foil);
}

html[data-theme] .page-room .play-modes__go:focus-visible {
  outline: 2px solid var(--on-vault);
  outline-offset: -2px;
}

html[data-theme] .page-room .play-modes__go--ghost {
  color: var(--on-vault-2);
}

html[data-theme] .page-room .play-modes__text {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 4px;
  font: inherit;
  color: var(--on-vault-2);
}

html[data-theme] .page-room .play-modes__text b {
  font: inherit;
  color: inherit;
}

html[data-theme] .page-room .play-modes__text b.lat {
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 1.12em;
}

html[data-theme] .page-room .play-modes__lock {
  font: 500 12px/1 var(--font-display);
  letter-spacing: 0.04em;
  color: var(--on-vault-2);
  opacity: 0.9;
}

/* ================= 初回: 机に積んだ最初の本 ================= */
.welcome__kicker {
  margin-bottom: 10px;
}

.welcome__title {
  font-size: 27px;
  line-height: 1.42;
}

.welcome__lead {
  margin: 8px 0 0;
  font: 500 15px/1.8 var(--font-display);
  color: var(--ink-page-2);
  letter-spacing: 0.06em;
}

.pick-k {
  margin: 0;
  font: 500 var(--fs-meta) / 1.5 var(--font-display);
  letter-spacing: 0.14em;
  color: var(--ink-page-3);
}

.pick-t {
  margin: 2px 0 0;
  font: 500 24px/1.35 var(--font-display);
  letter-spacing: 0.08em;
  color: var(--ink-page);
  transition: opacity 180ms;
}

.pick-s {
  margin: 2px 0 0;
  font: 500 var(--fs-small) / 1.6 var(--font-display);
  color: var(--ink-page-3);
  letter-spacing: 0.06em;
  transition: opacity 180ms;
}

.welcome__note {
  margin: 10px 0 0;
  font: 500 13px/1.7 var(--font-display);
  color: var(--ink-page-3);
  letter-spacing: 0.04em;
  word-break: keep-all; /* 「答え」のような語の途中で折らない（折るのは空白・句読点のあと） */
  overflow-wrap: anywhere;
  text-wrap: pretty;
  transition: opacity 180ms;
}

.swapping :is(.pick-t, .pick-s, .welcome__note) {
  opacity: 0;
}

.login-line {
  margin: 4px 0 -8px;
  font: 500 13px/1.6 var(--font-display);
  color: var(--ink-page-3);
  letter-spacing: 0.06em;
}

.login-line a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 6px;
  color: var(--ink-page-2);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(169, 122, 50, 0.7);
}

.login-line a:hover {
  color: var(--ink-page);
}

/* 積んだ本の見出し: 木の上に直に書かず、紙の小札に */
.pile {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
}

.stack-k {
  display: inline-block;
  margin: 20px 4px 10px;
  padding: 4px 12px 3px;
  transform: rotate(-1deg);
  font: 500 13px/1.5 var(--font-display);
  letter-spacing: 0.1em;
  color: var(--ink-page-2);
  background: url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px, #EFE6D2;
  background-blend-mode: soft-light, normal;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.35), 2px 3px 5px -2px rgba(0, 0, 0, 0.4);
  clip-path: polygon(0 6%, 12% 0, 30% 5%, 52% 0, 74% 4%, 100% 0, 99% 50%, 100% 100%, 80% 95%, 58% 100%, 36% 95%, 14% 100%, 0 96%, 1% 50%);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .stack-k {
  /* 札の紙は机の多重の陰（.desk__candle--s の multiply）で 3 割ほど沈むので、素の色は明るめに（実測: #A48E6C だと 3.4:1、#C9B48E は 390 で最小 4.4:1 → #E0D2B2・橙 .12。Batch 61） */
  background: linear-gradient(to right, rgba(255, 170, 86, 0.12), rgba(4, 6, 12, 0.06)), url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px, #E0D2B2;
  background-blend-mode: normal, soft-light, normal;
  color: #120C08;
}

.stack {
  list-style: none;
  margin: 0;
  padding: 0 2px 4px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.stack li {
  width: 100%;
  margin-top: -1px;
}

.stack li[hidden] {
  display: none;
}

/* 横に寝かせた本（背を手前に。題は横書きで読める）。押すと机の本が替わる */
.flatbook {
  --c: #2B1F17;
  --x: 0px;
  --r: 0deg;
  --wd: 92%;
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  width: var(--wd);
  height: var(--hh, 44px);
  margin-left: var(--x);
  padding: 0 16px 0 14px;
  border: 0;
  border-radius: 2px 3px 3px 2px;
  cursor: pointer;
  transform: rotate(var(--r));
  text-align: left;
  color: var(--foil);
  font: inherit;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.55) 0, rgba(255, 238, 205, 0.22) 2px, rgba(0, 0, 0, 0.1) 4px, transparent 8px, transparent calc(100% - 9px), rgba(0, 0, 0, 0.12) calc(100% - 6px), rgba(255, 238, 205, 0.14) calc(100% - 4px), rgba(0, 0, 0, 0.5) 100%),
    linear-gradient(to bottom, rgba(255, 238, 205, 0.2) 0, rgba(255, 238, 205, 0.04) 28%, rgba(0, 0, 0, 0.06) 55%, rgba(0, 0, 0, 0.5) 100%),
    linear-gradient(90deg, transparent 12px, rgba(230, 200, 135, 0.7) 12px, rgba(230, 200, 135, 0.7) 12.8px, transparent 12.8px 14.6px, rgba(230, 200, 135, 0.7) 14.6px, rgba(230, 200, 135, 0.7) 15.4px, transparent 15.4px),
    url(../assets/images/room/tile-leather.webp) 0 0 / 80px 80px,
    var(--c);
  background-blend-mode: normal, normal, normal, soft-light, normal;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.6), 3px 5px 8px -3px rgba(0, 0, 0, 0.5);
  transition: transform 160ms, filter 160ms;
}

.flatbook::after {
  /* 頁の小口（右端） */
  content: "";
  position: absolute;
  right: -4px;
  top: 3px;
  bottom: 3px;
  width: 5px;
  border-radius: 0 2px 2px 0;
  background: repeating-linear-gradient(to bottom, #EFE5CF 0 1px, #CDBF9F 1px 2px);
  box-shadow: 1px 0 0 rgba(0, 0, 0, 0.3);
}

.flatbook:hover {
  filter: brightness(1.1);
  transform: rotate(var(--r)) translateX(6px);
  color: var(--foil);
  background-color: var(--c);
}

/* 机に出ている本: 少し引き出して、絹のしおり */
.flatbook[aria-pressed="true"] {
  transform: rotate(var(--r)) translateX(10px);
}

.flatbook[aria-pressed="true"]::before {
  content: "";
  position: absolute;
  right: 22px;
  top: -2px;
  width: 6px;
  height: 18px;
  background: linear-gradient(90deg, var(--lapis), var(--lapis-3) 45%, var(--lapis-2) 70%, var(--lapis));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 80%, 0 100%);
  filter: drop-shadow(1px 1px 1px rgba(0, 0, 0, 0.5));
}

.flatbook:focus-visible {
  outline: 2px solid var(--on-vault);
  outline-offset: 2px;
}

.flatbook__k {
  padding-left: 10px;
  min-width: 64px;
  font: 500 12.5px/1 var(--font-display);
  letter-spacing: 0.1em;
  color: #EBD6A6;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.55);
  white-space: nowrap;
}

.flatbook__t {
  font: 500 16px/1 var(--font-display);
  letter-spacing: 0.06em;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.55), 0 -0.5px 0 rgba(255, 240, 200, 0.2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.flatbook__s {
  display: none;
  margin-left: auto;
  font: 500 12px/1 var(--font-display);
  letter-spacing: 0.04em;
  color: #EBD6A6;
  white-space: nowrap;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
}

/* データの約束: 木の上に直に書かず、積んだ本の下の紙片に（.stack-k と同じ紙） */
html[data-theme] .page-room .welcome-trust {
  position: relative;
  margin: 18px 4px 0;
  padding: 9px 14px 8px;
  border: 0;
  transform: rotate(0.4deg);
  font: 500 12.5px/1.7 var(--font-display);
  letter-spacing: 0.04em;
  color: var(--ink-page-2);
  text-shadow: none;
  text-wrap: pretty;
  background: linear-gradient(to bottom, transparent 70%, rgba(90, 70, 40, 0.1) 100%), url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px, #EFE6D2;
  background-blend-mode: normal, soft-light, normal;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.35), 2px 3px 5px -2px rgba(0, 0, 0, 0.4);
}

html:is([data-theme="dark"], [data-theme="indigo"]) .page-room .welcome-trust {
  background: linear-gradient(to right, rgba(255, 170, 86, 0.12), rgba(4, 6, 12, 0.06)), url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px, #E0D2B2;
  background-blend-mode: normal, soft-light, normal;
  color: #120C08;
}

/* 初回は幕板を低く（ほかの遊び方は机の本が出てから） */
html[data-theme] body.welcome-open .desk__front {
  display: none;
}

/* ================= 床・フッター: 胡桃の幅木と床板（頁は部屋の中で終わる） ================= */
html[data-theme] .page-room .site-footer {
  position: relative;
  margin: 0;
  border: 0;
  color: var(--on-vault-2);
  background:
    linear-gradient(to bottom, rgba(255, 226, 186, 0.3) 0, rgba(255, 226, 186, 0.3) 1px, rgba(0, 0, 0, 0.25) 1px, transparent 4px),
    linear-gradient(to bottom, transparent 18px, rgba(0, 0, 0, 0.55) 18px, rgba(0, 0, 0, 0.55) 19px, rgba(255, 226, 186, 0.1) 19px, transparent 21px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0) 20px, rgba(0, 0, 0, 0.35) 60px, rgba(0, 0, 0, 0.6) 100%),
    url(../assets/images/room/tile-wood.webp) 0 0 / 640px 256px,
    linear-gradient(to bottom, var(--wood), var(--wood-2) 18px, var(--wood-3) 19px, var(--floor) 100%);
  background-blend-mode: normal, normal, normal, soft-light, normal;
}

html[data-theme] .page-room .site-footer__inner {
  padding: 36px 0 30px;
}

html[data-theme] .page-room .site-footer .brand__name,
html[data-theme] .page-room .site-footer .brand__mark {
  color: var(--on-vault);
  border-color: rgba(232, 220, 194, 0.5);
}

html[data-theme] .page-room .site-footer__tagline,
html[data-theme] .page-room .site-footer__copy,
html[data-theme] .page-room .site-footer__nav a,
html[data-theme] .page-room .site-footer__linkbtn {
  color: var(--on-vault-2);
}

html[data-theme] .page-room .site-footer__nav a,
html[data-theme] .page-room .site-footer__linkbtn {
  text-decoration: underline;
  text-decoration-color: rgba(230, 200, 135, 0.4);
  text-underline-offset: 4px;
}

html[data-theme] .page-room .site-footer__nav a:hover,
html[data-theme] .page-room .site-footer__linkbtn:hover {
  color: var(--on-vault);
}

/* ================= プレイ中（body.home--playing）: 部屋の帯と本棚を畳む。本は 1 行の柱（running head）に、盤面は机の上の 1 枚の羊皮紙に。机は盤面の下で終わり、その下は床 ================= */
html[data-theme] body.home--playing .room {
  --vault-h: 64px;
  --stage-h: 64px;
  --desk-top: 64px;
  /* 机の下は床板（横の木目・板の継ぎ目・奥ほど暗い）。部屋が畳まれて内容が短くても、机がフッターまで伸びて見えない */
  background:
    linear-gradient(to bottom, rgba(0, 0, 0, 0.22), rgba(0, 0, 0, 0) 160px, rgba(0, 0, 0, 0) 55%, rgba(0, 0, 0, 0.32) 100%),
    repeating-linear-gradient(to bottom, transparent 0 69px, rgba(0, 0, 0, 0.5) 69px 70px, rgba(255, 226, 186, 0.06) 70px 71px, transparent 71px 72px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.22), transparent 18%, transparent 82%, rgba(0, 0, 0, 0.28)),
    linear-gradient(color-mix(in srgb, var(--floor) 50%, transparent), color-mix(in srgb, var(--floor) 50%, transparent)),
    url(../assets/images/room/tile-wood.webp) 0 0 / 640px 256px,
    linear-gradient(to bottom, var(--wood-3), var(--floor) 420px);
  background-blend-mode: normal, normal, normal, normal, soft-light, normal;
}

html[data-theme] body.home--playing :is(.room__scene, .room__pool, .room__shaft, #hasumiHome, .room__rib, .desk__candle, .desk__under, #bookshelf, #todayStrip, .tome__page--r, .tome__page--toc, .path__meta, .path__progress, .path__kicker, .path__head-actions, .path__courses, .path__courses-backdrop, .tome__ribbon, .fore-quill, .play-modes) {
  display: none;
}

html[data-theme] body.home--playing .room__vault {
  -webkit-mask: none;
  mask: none;
}

html[data-theme] body.home--playing .desk {
  padding-top: 8px;
  padding-bottom: 24px;
}

/* 柱の後ろ: 天井の帯の下で机の奥の縁は陰に沈む（紙の色の題と下線の語が、窓の光の溜まる天板の上で 4.5:1 を切らない） */
html[data-theme] body.home--playing .desk::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 104px;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(24, 14, 6, 0.52) 0, rgba(24, 14, 6, 0.46) 48px, rgba(24, 14, 6, 0) 104px);
}

/* 机の手前の縁（幕板）はプレイ中も見せる: 机は盤面の 24px 下で終わり、その下は床（中の「ほかの遊び方」は畳んだまま。影は床に落ちる） */
html[data-theme] body.home--playing .desk__front {
  margin: 0 -12px -24px;
  padding: 7px 16px 8px;
}

/* 本は 1 行の柱: 題（14px・紙の色）・「机に戻る」・「設定」。革の表紙と金の細線の額は畳み、下に金の罫を 1 本 */
html[data-theme] body.home--playing #pathCard {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  margin: 0 auto 12px;
  padding: 8px 2px;
  border-radius: 0;
  background: none;
  box-shadow: 0 1px 0 rgba(230, 200, 135, 0.5), 0 2px 0 rgba(0, 0, 0, 0.3);
}

html[data-theme] body.home--playing #pathCard::before,
html[data-theme] body.home--playing #pathCard::after {
  display: none;
}

html[data-theme] body.home--playing #pathCard .tome__page--l {
  flex: 1 1 160px;
  min-width: 0;
  padding: 0;
  background: none;
  box-shadow: none;
}

html[data-theme] body.home--playing #pathCard .tome__page--l::after {
  display: none;
}

html[data-theme] body.home--playing #pathCard .path__title {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--parchment);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
}

html[data-theme] body.home--playing .page-room .play__bar,
html[data-theme] body.home--playing #pathCard .play__bar {
  flex: none;
  flex-wrap: nowrap;
  margin: 0;
  padding: 0;
}

/* 「机に戻る」は枠の付いた札ではなく、柱の中の下線の付いた語 */
html[data-theme] body.home--playing .back-to-path {
  padding: 0 4px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--on-vault);
  font-size: 13px;
  text-decoration: underline;
  text-decoration-color: rgba(230, 200, 135, 0.6);
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.45);
}

html[data-theme] body.home--playing .back-to-path:hover {
  background: transparent;
  color: var(--foil);
  text-decoration-color: var(--foil);
}

/* 盤面: 机の上に置いた 1 枚の羊皮紙（角 2px・小口の段・右下へ落ちる影）。中身（card.css）は変えない */
html[data-theme] body.home--playing #gameCard {
  border-radius: 2px;
  border: 1px solid transparent;
  background:
    radial-gradient(ellipse 80% 50% at 10% 0%, var(--page-hot), transparent 70%),
    linear-gradient(var(--far-page), var(--far-page)),
    url(../assets/images/room/tile-paper-soft.webp) 0 0 / 256px 256px,
    var(--parchment);
  background-blend-mode: normal, normal, soft-light, normal;
  box-shadow:
    inset 0 0 36px rgba(120, 80, 30, 0.1),
    0 1px 0 var(--parchment-edge),
    1px 2px 0 var(--parchment-gap),
    2px 3px 0 var(--parchment-2),
    3px 4px 0 rgba(0, 0, 0, 0.28),
    5px 10px 18px -8px rgba(var(--shadow-rgb), 0.55);
  /* 部屋の中に緑は無い: 正解・済みは金 */
  --ok: var(--gold-ink);
  --ok-soft: #EEE3C4;
}

html[data-theme] body.home--playing #gameCard.game-card--recalled,
html[data-theme] body.home--playing #gameCard.game-card--learned {
  border-color: var(--gold);
}

html[data-theme] body.home--playing #gameCard.game-card--failed {
  border-color: var(--signal);
}

/* 夜も紙は明るく、墨は濃い（§3.13: 頁は L* 88 のろうそくの紙）。盤面の中の紙と墨のトークンだけを昼の値に戻す */
html:is([data-theme="dark"], [data-theme="indigo"]) body.home--playing #gameCard {
  --far-page: rgba(70, 40, 12, 0.1); /* 盤面の紙は沈めない（.page-room の夜の値より前の値） */
  --paper: #E8DCC2;
  --paper-2: var(--parchment);
  --paper-3: var(--parchment-2);
  --ink: #2A2119;
  --ink-2: #4A3D30;
  --ink-3: #5E5040;
  --ink-4: #8A7B66;
  --line: #C4B48E;
  --line-2: #9A8864;
  --signal: #C73E24;
  --signal-ink: #A9301B;
  --signal-soft: #ECCFBC;
  --ok: #6B4E1E;
  --ok-soft: #E0D2AE;
  --warn: #7A4E0C;
  --warn-soft: #E6D6AE;
}

/* ================= 動き（環境だけ。reduce で止める） ================= */
@keyframes room-flicker {
  0%, 100% { opacity: 1; }
  18% { opacity: 0.93; }
  31% { opacity: 0.99; }
  47% { opacity: 0.92; }
  63% { opacity: 1; }
  79% { opacity: 0.95; }
}

@media (prefers-reduced-motion: reduce) {
  .room *,
  .room *::before,
  .room *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ================= 背の低いスマホ（高さ 700px 以下）: 部屋の帯を詰め、スタートを 1 画面目に ================= */
@media (max-width: 1099px) and (max-height: 700px) {
  html[data-theme] body:not(.home--playing) .room {
    --vault-h: 84px;
    --stage-h: 194px;
    --desk-top: 172px;
  }
  .room__scene--phone {
    display: none;
    background-image: none !important;
  }
  .room__scene--short {
    display: block;
    background-image: url(../assets/images/room/scene-short-light.webp);
  }
  html:is([data-theme="dark"], [data-theme="indigo"]) .room__scene--short {
    background-image: url(../assets/images/room/scene-short-dark.webp);
  }
  .room__pool--win {
    left: calc(var(--sx) + 112px);
    top: 130px;
  }
  .room__pool--candle {
    left: calc(var(--sx) + 171px);
    top: 142px;
  }
  .desk__candle {
    --fx: calc(50% - 195px + 171px);
    --fy: -30px;
  }
  html[data-theme] .page-room .hasumi--home {
    left: calc(var(--sx) + 148px);
    top: 66px;
  }
  html[data-theme] .page-room .hasumi--home .slip {
    max-width: 160px;
    padding: 12px 12px 9px 14px;
    font-size: 14.5px;
    line-height: 1.5;
    letter-spacing: 0.02em;
  }
  .room__shaft::before {
    top: 100px;
    left: 96px;
    height: 56px;
  }
  .room__shaft::after {
    top: 150px;
    left: 70px;
  }
  .tome__page {
    padding-top: 14px;
    padding-bottom: 14px;
  }
  .progress {
    margin-top: 8px;
  }
  .start {
    margin-top: 12px;
  }
}

/* 幅 380px 未満: 字間を詰める */
@media (max-width: 379px) {
  .runhead {
    font-size: 11.5px;
    letter-spacing: 0.08em;
  }
  .tome__page {
    padding-left: 16px;
    padding-right: 16px;
  }
  .chap__t {
    font-size: 18px;
    letter-spacing: 0;
  }
  .todays {
    font-size: 14.5px;
    letter-spacing: 0;
  }
  html[data-theme] .page-room .play-modes {
    font-size: 13.5px;
    letter-spacing: 0.04em;
  }
}

@media (max-width: 359px) {
  .room {
    --sx: 0px;
  }
  .desk__candle {
    --fx: 180px;
  }
  .tome__title {
    font-size: 25px;
  }
  /* 紙片は少し小さく（「。」だけが 3 行目に落ちない） */
  html[data-theme] .page-room .hasumi--home .slip {
    max-width: 160px;
    padding: 13px 12px 10px 14px;
    font-size: 14.5px;
    line-height: 1.55;
    letter-spacing: 0.02em;
  }
  html[data-theme] .page-room .hasumi--home .slip--long {
    font-size: 14px;
  }
  /* 320px のヘッダーは 3 タブ＋ログインで幅いっぱい: 数字だけ（炎と単位は畳む。aria-label は残る） */
  html[data-theme] .page-room .header-streak span,
  html[data-theme] .page-room .header-streak .icon {
    display: none;
  }
  html[data-theme] .page-room .header-streak {
    padding: 4px 2px;
  }
}

/* スマホの場面を 1 割大きく（はちゃんが約 75px → 81px）: 下辺の 30% を軸に拡大し（窓枠も額も収まる）、上にはみ出す 21px（局所 19.5px）は切る。高さは変わらないのでスタートの位置は動かない。
   炎・窓の光・紙片・光の筋も同じ写像（x → 1.08x − 9.4、y → 1.08y − 21）に合わせる。背の低いスマホ（scene-short）と PC（scene-desk）には掛けない */
@media (max-width: 1099px) and (min-height: 701px) {
  .room__scene--phone {
    transform: scale(1.08);
    transform-origin: 30% 100%;
    clip-path: inset(19.5px 0 0 0);
  }
  .room__shaft {
    transform: scale(1.08);
    transform-origin: 30% 100%; /* 筋の箱の下端 = 机の天板の線。場面と同じ --stage-h を軸にすると切り口が 1.8px 浮いて壁の筋が見える */
  }
  .room__pool--win {
    left: calc(var(--sx) + 157px);
    top: 171px;
  }
  .room__pool--candle {
    left: calc(var(--sx) + 185px);
    top: 201px;
  }
  .desk__candle {
    --fx: calc(var(--sx) + 185px);
    --fy: -39px;
  }
  html[data-theme] .page-room .hasumi--home {
    left: calc(var(--sx) + 150px); /* 基準 (148, 100) を同じ写像で: x 1.08×148 − 9.4 = 150.4、y 1.08×100 − 21 = 87 */
    top: 87px;
  }
}

/* タブレット: 机の本は中央に、幅 560 */
@media (min-width: 600px) and (max-width: 1099px) {
  .desk__under,
  .pile {
    max-width: 560px;
  }
}

/* ================= PC（机は左、本棚は右） ================= */
@media (min-width: 1100px) {
  html[data-theme] .page-room .site-header__inner {
    width: min(1120px, 100% - 80px);
  }
  html[data-theme] body:not(.home--playing) .room {
    --vault-h: 84px;
    --stage-h: 430px;
    --desk-top: 398px;
  }
  .room {
    --sx: 0px;
  }
  .room__vault {
    -webkit-mask: none;
    mask: none;
  }
  .room__vault::before {
    background-size: auto 100%;
  }
  .room__vault::after {
    /* PC: まっすぐのコーニス（平縁・反曲・歯飾り・金の細線・壁への影） */
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    height: 16px;
    background:
      linear-gradient(to bottom, rgba(230, 200, 135, 0.75) 0, rgba(230, 200, 135, 0.75) 1px, transparent 1px),
      linear-gradient(to bottom, transparent 1px, var(--stone-lit) 1px, var(--stone) 4px, var(--stone-lit) 5px, var(--stone-sh) 8px, transparent 8px),
      linear-gradient(to bottom, transparent 8px, var(--stone-sh) 8px, var(--stone-dk) 12px, transparent 12px),
      linear-gradient(to bottom, transparent 12px, rgba(var(--shadow-rgb), 0.35) 12px, rgba(var(--shadow-rgb), 0) 16px);
    box-shadow: 0 6px 12px -4px rgba(var(--shadow-rgb), 0.35);
  }
  html[data-theme] body.home--playing .room__vault::after {
    display: none;
  }
  .room__rib {
    display: none;
  }
  .room__in {
    --gut: max(0px, calc((100vw - 1200px) / 2));
    display: grid;
    grid-template-columns: 640px minmax(0, 1fr);
    gap: 0 40px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    align-items: start;
  }
  html[data-theme] body.home--playing .room__in {
    display: block;
    max-width: 900px;
  }
  .nook {
    z-index: 3;
  }
  .room__scene--phone,
  .room__scene--short {
    display: none !important;
    background-image: none !important;
  }
  .room__scene--desk {
    display: block;
    background-image: url(../assets/images/room/scene-desk-light.webp);
  }
  html:is([data-theme="dark"], [data-theme="indigo"]) .room__scene--desk {
    background-image: url(../assets/images/room/scene-desk-dark.webp);
  }
  .room__pool--win {
    left: calc(var(--sx) + 257px);
    top: 284px;
    width: 980px;
    height: 860px;
  }
  .room__pool--candle {
    left: calc(var(--sx) + 291px);
    top: 320px;
  }
  .desk__candle {
    --fx: calc(40px + var(--gut, 0px) + 291px);
    --fy: -78px;
  }
  .room__shaft {
    width: 640px;
  }
  .room__shaft::before {
    left: 187px;
    top: 301px;
    width: 420px;
    height: 110px;
    transform: rotate(37deg);
  }
  .room__shaft::after {
    left: 134px;
    top: 353px;
    width: 360px;
    height: 36px;
    transform: rotate(36deg);
  }
  html[data-theme] .page-room .hasumi--home {
    left: calc(var(--sx) + 266px);
    top: 228px;
  }
  html[data-theme] .page-room .hasumi--home .slip,
  html[data-theme] .page-room .hasumi--home .slip--long {
    width: auto;
    margin-left: 0;
    max-width: 348px; /* 14 字（おかえり。5分だけ、いこう。）が 1 行に */
    padding: 16px 22px 13px 22px;
    font-size: 20px;
    line-height: 1.5;
    letter-spacing: 0.06em;
    transform: rotate(-1.2deg);
    white-space: nowrap;
  }
  html[data-theme] body.welcome-open .page-room .hasumi--home .slip,
  html[data-theme] .page-room .hasumi--home .slip--long {
    font-size: 19px;
    white-space: normal;
  }
  html[data-theme] body.welcome-open .hasumi--home .slip {
    max-width: 234px; /* 「はじめまして、見習いの／はちゃん。」の 1 行目の幅に合わせる（紙が余らない。body が .page-room なので body の後に .page-room は置けない） */
  }
  /* 机: 左は窓の下から、右は本棚の脇まで（板が宙に浮かない） */
  .desk {
    padding: 18px 60px 26px calc(40px + var(--gut));
    margin-left: calc(-40px - var(--gut));
    margin-right: -40px;
    box-shadow: 0 14px 22px -10px rgba(var(--shadow-rgb), 0.5);
    /* 天板の奥の縁（場面の下）は窓の光を受けて明るい帯（10px）→ 6px で消え → 本の手前で 1px の暗い段: 天板の面が本の下に潜る（本が板に貼り付かない） */
    background:
      linear-gradient(to bottom, rgba(20, 12, 6, 0.55) 0, rgba(20, 12, 6, 0) 1.5px),
      linear-gradient(to bottom, var(--desk-band) 0, var(--desk-band) 10px, transparent 16px, transparent 17px, rgba(20, 12, 6, 0.28) 17px, rgba(20, 12, 6, 0) 18px),
      radial-gradient(ellipse 60% 260px at 24% 0, rgba(255, 246, 228, 0.2), transparent 100%),
      linear-gradient(90deg, rgba(0, 0, 0, 0.14), transparent 12%, transparent 88%, rgba(0, 0, 0, 0.18)),
      linear-gradient(to bottom, color-mix(in srgb, var(--wood-top) 58%, transparent), color-mix(in srgb, var(--wood) 58%, transparent) 70%, color-mix(in srgb, var(--wood-2) 58%, transparent)),
      url(../assets/images/room/tile-wood.webp) 0 0 / 640px 256px,
      linear-gradient(to bottom, var(--wood-top), var(--wood) 70%, var(--wood-2));
    background-blend-mode: normal, normal, normal, normal, normal, soft-light, normal;
  }
  html[data-theme] body.home--playing .desk {
    margin: 0;
    padding: 8px 20px 24px;
  }
  html[data-theme] body.home--playing .desk__front {
    margin: 0 -20px -24px;
    padding: 7px 20px 8px;
  }
  /* 羊皮紙は画面の 2/3 まで（床は細い帯・中身は上寄せ） */
  html[data-theme] body.home--playing #gameCard {
    min-height: min(560px, calc(100vh - 300px));
  }
  .desk::after {
    /* 本棚に突き当たる端の木口 */
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 6px;
    background: linear-gradient(90deg, rgba(0, 0, 0, 0.5), rgba(255, 228, 190, 0.18) 2px, rgba(0, 0, 0, 0.35) 6px);
  }
  html[data-theme] body.home--playing .desk::after {
    display: none;
  }
  .desk__front {
    margin: 26px -60px -26px calc(-40px - var(--gut));
    padding: 4px 20px 6px calc(20px + var(--gut));
  }
  .desk__under {
    max-width: none;
    padding-left: 0;
    padding-right: 0;
  }
  .tome {
    max-width: none;
    padding: 9px;
  }
  html[data-theme] body:not(.home--playing) #pathCard {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-areas: "l r" "toc r" "bar bar";
  }
  #pathCard .tome__page--l { grid-area: l; }
  #pathCard .tome__page--toc { grid-area: toc; }
  #pathCard .tome__page--r { grid-area: r; }
  #pathCard .play__bar { grid-area: bar; }
  .tome__block {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .tome__page {
    padding: 24px 32px 26px;
  }
  .tome--first .tome__page,
  #pathCard .tome__page--r {
    min-height: 330px;
  }
  /* 左頁と目次の頁は 1 枚の紙（継ぎ目を消す）。左に小口の段 */
  .tome__page--l,
  .tome__page--toc {
    border-radius: 1px 0 0 1px;
    background-image: linear-gradient(225deg, var(--cast-l), transparent 55%), radial-gradient(ellipse 100% 70% at 0% 0%, var(--page-hot), transparent 75%), linear-gradient(to left, rgba(110, 78, 40, 0.24), rgba(110, 78, 40, 0.06) 30px, rgba(110, 78, 40, 0) 60px), url(../assets/images/room/tile-paper-soft.webp);
    background-blend-mode: normal, normal, normal, soft-light;
    background-size: auto, auto, auto, 256px 256px;
    box-shadow: inset 0 0 32px rgba(120, 80, 30, 0.09), -1px 0 0 #E9DFC8, -2px 0 0 var(--parchment-gap), -3px 1px 0 #E4D8BE, -4px 1px 0 var(--parchment-gap), -5px 2px 0 #DDD0B4, 0 1px 0 #E9DFC8, 0 2px 0 var(--parchment-gap);
  }
  .tome__page--toc {
    padding-top: 0;
    background-image: linear-gradient(to left, rgba(110, 78, 40, 0.24), rgba(110, 78, 40, 0.06) 30px, rgba(110, 78, 40, 0) 60px), url(../assets/images/room/tile-paper-soft.webp);
    background-blend-mode: normal, soft-light;
    background-size: auto, 256px 256px;
  }
  .tome__page--l {
    padding-bottom: 8px;
    box-shadow: inset 0 0 32px rgba(120, 80, 30, 0.09), -1px 0 0 #E9DFC8, -2px 0 0 var(--parchment-gap), -3px 1px 0 #E4D8BE, -4px 1px 0 var(--parchment-gap), -5px 2px 0 #DDD0B4;
  }
  .tome--first .tome__page--l {
    padding-bottom: 26px;
    box-shadow: inset 0 0 32px rgba(120, 80, 30, 0.09), -1px 0 0 #E9DFC8, -2px 0 0 var(--parchment-gap), -3px 1px 0 #E4D8BE, -4px 1px 0 var(--parchment-gap), -5px 2px 0 #DDD0B4, 0 1px 0 #E9DFC8, 0 2px 0 var(--parchment-gap);
  }
  .tome__page--toc::before,
  .tome__page--l::after {
    display: none;
  }
  .tome__page--r {
    border-radius: 0 1px 1px 0;
    background-image: radial-gradient(ellipse 80% 60% at 0% 0%, rgba(255, 253, 244, 0.25), transparent 70%), linear-gradient(to right, rgba(110, 78, 40, 0.26), rgba(110, 78, 40, 0.06) 30px, rgba(110, 78, 40, 0) 60px), url(../assets/images/room/tile-paper-soft.webp), linear-gradient(var(--far-page), var(--far-page));
    background-blend-mode: normal, normal, soft-light, normal;
    background-size: auto, auto, 256px 256px, auto;
    box-shadow: inset 0 0 32px rgba(120, 80, 30, 0.09), 1px 0 0 #E9DFC8, 2px 0 0 var(--parchment-gap), 3px 1px 0 #E2D6BB, 4px 1px 0 var(--parchment-gap), 5px 2px 0 #DCCFB2, 0 1px 0 #E9DFC8, 0 2px 0 var(--parchment-gap);
  }
  .tome__page--r::before {
    left: 0;
    right: auto;
    top: 6px;
    bottom: 6px;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, transparent, rgba(255, 252, 240, 0.9) 20%, rgba(255, 252, 240, 0.9) 80%, transparent);
  }
  .tome__page--r::after {
    left: 0;
    right: auto;
    top: 0;
    bottom: 0;
    width: 1px;
    height: auto;
    background: rgba(90, 64, 34, 0.35);
  }
  /* 頁の上辺は綴じ目へ反る: 外の角で 0、綴じ目で 3px 沈む楕円の弧（弧の外は表紙の革の陰）。空いている擬似要素だけを使う（#pathNow・.welcome__cta は position を持たないので基準は右頁）。文字は padding-top 24px の中に来ない */
  .tome__page--l::before,
  #pathNow::before,
  .welcome__cta::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 4px;
    pointer-events: none;
    background: radial-gradient(ellipse 130% 8.3px at 0 8.3px, transparent calc(100% - 2.5px), color-mix(in srgb, var(--lapis) 70%, #000) 100%);
  }
  #pathNow::before,
  .welcome__cta::before {
    background: radial-gradient(ellipse 130% 8.3px at 100% 8.3px, transparent calc(100% - 2.5px), color-mix(in srgb, var(--lapis) 70%, #000) 100%);
  }
  html[data-theme] body.home--playing #pathCard .tome__page--l::before {
    content: none; /* プレイ中の柱（1 行）には反りは無い */
  }
  .runhead {
    margin-bottom: 14px;
    white-space: nowrap;
  }
  #pathCard .tome__meta {
    font-size: 14.5px; /* 「教科書レベル・答えは英語・120語」が左頁の幅（237px）で 1 行に（実測 228px） */
    letter-spacing: 0;
  }
  .todays {
    margin-top: 14px;
  }
  .start {
    height: 56px;
    margin-top: 26px;
  }
  .tome__links {
    margin-top: 8px;
  }
  .tome__links .path__shelf-link {
    display: none; /* PC は本棚が右に見えている */
  }
  .progress__txt b {
    font-size: 38px;
  }
  .tome__ribbon {
    left: 50%;
    margin-left: 30px;
    bottom: -40px;
    height: 62px;
  }
  .fore-quill {
    right: 26px;
    top: -22px;
    width: 84px;
    height: 42px;
  }
  html[data-theme] .page-room .play__bar {
    margin-top: 6px;
  }
  /* 初回（PC）: 積んだ本は開いた本の脇（机の上）に。4 冊すべてが 1 画面目に入る。
     html[data-first-visit] の間（index.html の <head> の 1 行が初回と見て js が引き継ぐまで。hidden のまま css/welcome.css が出す）も同じ格子 */
  html[data-theme] .page-room #welcome:not([hidden]),
  html[data-theme][data-first-visit] .page-room #welcome {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 138px;
    column-gap: 12px;
    align-items: end;
  }
  html[data-theme][data-first-visit] .page-room #welcome {
    display: grid !important; /* css/welcome.css の block !important より詳細 */
  }
  .tome--first {
    grid-column: 1;
  }
  .tome--first .tome__page {
    padding-left: 16px;
    padding-right: 16px;
    min-height: 360px;
  }
  .welcome__title {
    font-size: 23px;
    letter-spacing: 0.04em;
  }
  .welcome__kicker {
    font-size: 11px;
    letter-spacing: 0.03em;
    white-space: nowrap; /* 「登録なし・無料・ブラウザで動く」は 1 行に（頁の中身 194px に対して約 187px。<wbr> は nowrap でも折れるので幅で保証） */
  }
  .welcome__kicker::before {
    width: 12px;
    margin-right: 6px;
  }
  .welcome__lead {
    font-size: 14px;
    letter-spacing: 0.02em;
  }
  .pick-s {
    font-size: 13px;
    letter-spacing: 0.02em;
  }
  .welcome__note {
    letter-spacing: 0;
  }
  .pile {
    grid-column: 2;
    align-self: start;
    max-width: none;
    padding-top: 30px;
  }
  .stack-k {
    margin: 0 0 10px 0;
    font-size: 12px;
    letter-spacing: 0.04em;
    white-space: nowrap;
    padding: 4px 9px 3px;
  }
  .flatbook {
    --wd: 100%;
    height: 54px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 6px;
    padding: 0 8px 0 22px;
  }
  .flatbook__k {
    padding-left: 0;
    min-width: 0;
    font-size: 12px;
  }
  .flatbook__t {
    font-size: 13.5px;
    letter-spacing: 0;
    max-width: 100%;
  }
  .stack li:nth-child(odd) .flatbook {
    margin-left: 6px;
    width: calc(100% - 6px);
  }
  html[data-theme] .page-room .welcome-trust {
    grid-column: 1 / -1;
    margin: 14px 0 0;
  }
  .tome--first .fore-quill {
    right: 24px;
  }
  html[data-theme] .page-room .play-modes {
    font-size: 14px;
  }
  /* 夜（PC）: 見開きの遠い側（右頁）を 8% ほど沈める。盤面は夜の #gameCard の節で旧値に戻る */
  html:is([data-theme="dark"], [data-theme="indigo"]) .page-room {
    --far-page: rgba(60, 34, 10, 0.15);
  }
  /* 夜（PC）: 右端と左上の壁を深く沈める */
  html:is([data-theme="dark"], [data-theme="indigo"]) .room__vignette {
    height: 1100px;
    background: radial-gradient(ellipse 70% 75% at 30% 52%, transparent 35%, rgba(0, 0, 0, 0.55) 85%, rgba(0, 0, 0, 0.78) 100%), linear-gradient(90deg, transparent 80%, rgba(0, 0, 0, 0.45) 100%);
  }
  html:is([data-theme="dark"], [data-theme="indigo"]) .room__vault::after {
    filter: brightness(0.3) sepia(0.4);
  }
}

/* PC の背の低い画面: 部屋の帯を縮めて、スタートを 1 画面目に */
@media (min-width: 1100px) and (max-height: 820px) {
  html[data-theme] body:not(.home--playing) .room {
    --stage-h: 370px;
    --desk-top: 338px;
  }
  .room__scene--desk,
  .room__pool,
  .room__shaft,
  html[data-theme] .page-room .hasumi--home {
    transform-origin: 320px 100px;
  }
  .room__scene--desk,
  .room__shaft {
    transform: scale(0.8);
  }
  .room__shaft {
    height: calc(100px + (var(--desk-top) - 100px) / 0.8); /* 縮めても机の天板の線で終わる */
  }
  .room__pool {
    transform: translate(-50%, -50%) scale(0.8);
    transform-origin: 50% 50%;
  }
  .room__pool--win {
    left: calc(var(--sx) + 320px + (257px - 320px) * 0.8);
    top: calc(100px + (284px - 100px) * 0.8);
  }
  .room__pool--candle {
    left: calc(var(--sx) + 320px + (291px - 320px) * 0.8);
    top: calc(100px + (320px - 100px) * 0.8);
  }
  html[data-theme] .page-room .hasumi--home {
    left: calc(var(--sx) + 320px + (266px - 320px) * 0.8);
    top: calc(100px + (228px - 100px) * 0.8);
    transform-origin: 0 0;
    transform: scale(0.9);
  }
  .desk__candle {
    --fy: calc(-78px * 0.8 - 10px);
  }
  .tome__page {
    padding-top: 20px;
    padding-bottom: 22px;
  }
  .tome--first .tome__page,
  #pathCard .tome__page--r {
    min-height: 300px;
  }
  .todays {
    margin-top: 10px;
  }
  .start {
    margin-top: 18px;
  }
}

@media (min-width: 1100px) and (max-height: 700px) {
  html[data-theme] body:not(.home--playing) .room {
    --stage-h: 330px;
    --desk-top: 298px;
  }
  .room__scene--desk,
  .room__shaft {
    transform: scale(0.7);
  }
  .room__shaft {
    height: calc(100px + (var(--desk-top) - 100px) / 0.7);
  }
}

/* ================= 初回の 1 語体験の頁（スマホ: 右頁の下、PC: 左頁の下半分） ================= */
@media (min-width: 1100px) {
  .tome--first .tome__block {
    grid-template-areas: "l r" "demo r";
  }
  .tome--first .tome__page--l { grid-area: l; }
  .tome--first .tome__page--demo { grid-area: demo; }
  .tome--first .tome__page--r { grid-area: r; }
  .tome--first .tome__page {
    min-height: 0;
  }
  .tome--first .tome__page--r {
    min-height: 360px;
  }
  .tome--first .tome__page--l {
    padding-bottom: 8px;
    box-shadow: inset 0 0 32px rgba(120, 80, 30, 0.09), -1px 0 0 #E9DFC8, -2px 0 0 var(--parchment-gap), -3px 1px 0 #E4D8BE, -4px 1px 0 var(--parchment-gap), -5px 2px 0 #DDD0B4;
  }
  .tome--first .tome__page--demo {
    border-radius: 1px 0 0 1px;
    padding-top: 14px;
    padding-left: 20px;
    padding-right: 20px;
    background-image: linear-gradient(to left, rgba(110, 78, 40, 0.24), rgba(110, 78, 40, 0.06) 30px, rgba(110, 78, 40, 0) 60px), url(../assets/images/room/tile-paper-soft.webp);
    background-blend-mode: normal, soft-light;
    background-size: auto, 256px 256px;
    box-shadow: inset 0 0 32px rgba(120, 80, 30, 0.09), -1px 0 0 #E9DFC8, -2px 0 0 var(--parchment-gap), -3px 1px 0 #E4D8BE, -4px 1px 0 var(--parchment-gap), -5px 2px 0 #DDD0B4, 0 1px 0 #E9DFC8, 0 2px 0 var(--parchment-gap);
  }
  /* .tome__page--demo::before は content を与える規則が無く生成されない（display: none の規則は消した） */
  .welcome-demo {
    padding-top: 12px;
    border-top: 0.75px solid rgba(42, 33, 25, 0.25);
  }
  /* 初回の足元: 両頁の足元の余白に金の菱を 1 つ（進みの菱と同じ CSS の形。記号ではない）。絶対配置なので頁の高さは動かない（基準は右頁・1 語体験の頁） */
  .login-line::after,
  .welcome-demo::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 11px;
    width: 7px;
    height: 7px;
    margin-left: -3.5px;
    pointer-events: none;
    background: linear-gradient(135deg, #F3D58A, #A97A32);
    box-shadow: 0 0 0 0.5px rgba(62, 44, 18, 0.6);
    transform: rotate(45deg);
  }
}

/* ================= 読み込み中の頁: 語が届く前から最終の高さを取っておく（下の幕板とフッターが跳ばない。CLS）。
   値は 390 の実測（#pathHead 182・左頁 218・右頁 225・目次 333）。連続日数の帯（#todayStrip）は #pathHead の直後に margin-top -38px で重なるので、見出しの高さも先に取る（帯が頁の上端に浮いて 182px 落ちない） ================= */
#pathHead:empty {
  min-height: 182px;
}

/* 右頁と目次は中身（#pathNow・#pathList）に取る: 頁の padding（390 は 18px・背の低い端末と 359 以下は 14px）は各段の規則が足すので、
   頁ごとの定数（218・225・333）を置くと padding 14px の端末で 8px 余って縮む（CLS が戻る）。189 = 225 − 36、297 = 333 − 36 */
#pathNow:empty {
  min-height: 189px;
}

#pathList:empty {
  min-height: 297px;
}

html[data-theme] body.home--playing :is(#pathHead, #pathNow, #pathList):empty {
  min-height: 0;
}

@media (max-width: 359px) {
  #pathHead:empty {
    min-height: 175px;
  }
  #pathNow:empty {
    min-height: 182px;
  }
  #pathList:empty {
    min-height: 316px;
  }
}

@media (min-width: 1100px) {
  #pathHead:empty {
    min-height: 202px;
  }
}