:root{
  --world-fg:#e8f2fb;
  --world-muted:#a8bdcf;
  --world-line:rgba(148,197,221,.24);
  --world-line-soft:rgba(148,197,221,.14);
  --world-mint:#7cffb2;
  --world-cyan:#71eaff;
  --world-gold:#ffe98a;
  --world-learning:rgba(3,14,30,.82);
  --world-learning-alt:rgba(5,19,38,.76);
  --world-game:rgba(3,14,30,.18);
  --world-game-strong:rgba(3,14,30,.3);
  --world-radius:18px;
  --world-shadow:0 16px 38px rgba(0,0,0,.26);
}

.world-app,.world-app *{box-sizing:border-box}
.world-app{color:var(--world-fg)}
.world-app:is([data-app="fc-en"],[data-app="mental"],[data-app="speed"],[data-app="hunt"])
  :is(.card,.box,.word-box,#qaBox){
  backdrop-filter:blur(6px) saturate(108%);
  -webkit-backdrop-filter:blur(6px) saturate(108%);
}
.world-app :is(.topbar,.top-bar,#appTop){
  border:0;
  box-shadow:none;
  background:linear-gradient(180deg,rgba(3,12,28,.42),rgba(3,12,28,.12) 68%,transparent);
  backdrop-filter:blur(7px) saturate(110%);
}
.world-app :is(.back-link,.back,.back-btn,#backBtn){
  border:0!important;
  border-radius:0!important;
  padding:7px 2px!important;
  background:transparent!important;
  box-shadow:none!important;
  color:var(--world-fg)!important;
  text-decoration:none;
  font-weight:800;
}
.world-app :is(.back-link,.back,.back-btn,#backBtn):hover{color:var(--world-cyan)!important}
.world-app :is(.back-link,.back,.back-btn,#backBtn):focus-visible{
  outline:2px solid rgba(113,234,255,.52);
  outline-offset:4px;
}

/* 各科目フラッシュカード：基準デザイン */
body[data-app="fc-tex"] .topbar{background:linear-gradient(180deg,rgba(3,12,28,.44),rgba(5,17,36,.18))}
body[data-app="fc-tex"] .flashcard{
  overflow:hidden;
  background:linear-gradient(145deg,rgba(13,31,54,.78),rgba(3,13,28,.84));
  border-color:var(--world-line);
  box-shadow:var(--world-shadow),inset 0 1px 0 rgba(255,255,255,.05);
}
body[data-app="fc-tex"] .category-row{
  background:rgba(7,20,39,.14);
  border-bottom-color:var(--world-line);
}
body[data-app="fc-tex"] .qa{
  background:linear-gradient(180deg,var(--world-learning-alt),var(--world-learning));
}
body[data-app="fc-tex"] .card-section + .card-section{border-top-color:rgba(124,255,178,.22)}

/* 英単語・例文：一枚の学習面を区切り線で分割 */
body[data-app="fc-en"] .page{width:100%;padding-inline:16px}
body[data-app="fc-en"] .card{
  width:min(960px,calc(100vw - 32px));
  display:block;
  overflow:hidden;
  padding:0;
  border:1px solid var(--world-line);
  border-radius:var(--world-radius);
  background:linear-gradient(180deg,var(--world-learning-alt),var(--world-learning));
  box-shadow:var(--world-shadow);
}
body[data-app="fc-en"] .card:active{box-shadow:var(--world-shadow)}
body[data-app="fc-en"] .category-row{
  min-height:52px;
  padding:10px 16px;
  border-bottom:1px solid var(--world-line);
  background:rgba(7,20,39,.16);
}
body[data-app="fc-en"] #countLabel{
  flex:0 0 auto;
  margin:0;
  padding:4px 8px;
  color:var(--world-muted);
  font-size:.78rem;
}
body[data-app="fc-en"] .term-mean{
  min-height:128px;
  align-items:center;
  justify-content:center;
  padding:22px clamp(18px,4vw,42px);
  border-bottom:1px solid var(--world-line);
  text-align:center;
}
body[data-app="fc-en"] .phrases{gap:0}
body[data-app="fc-en"] .phrase-line{
  min-height:72px;
  justify-content:center;
  padding:12px clamp(18px,4vw,42px);
  border-bottom:1px solid var(--world-line-soft);
}
body[data-app="fc-en"] .phrase-line:last-child{border-bottom:0}
body[data-app="fc-en"] button{
  min-height:32px;
  padding:5px 10px;
  border-color:rgba(91,219,215,.3);
  border-radius:10px;
  background:rgba(9,31,47,.42);
}
@media(max-width:640px){
  body[data-app="fc-en"] .page{padding-inline:8px}
  body[data-app="fc-en"] .card{width:100%;border-radius:16px}
  body[data-app="fc-en"] .category-row{padding:9px 11px;gap:6px;flex-wrap:wrap}
  body[data-app="fc-en"] .category-spacer{display:none}
  body[data-app="fc-en"] .term-mean{min-height:112px;padding:18px 14px}
  body[data-app="fc-en"] .phrase-line{min-height:64px;padding:10px 14px}
}

/* フラッシュ暗算：操作・問題／選択肢を一枚の面で分割 */
body[data-app="mental"] .frame{width:min(620px,calc(100vw - 20px))}
body[data-app="mental"] .box{
  overflow:hidden;
  padding:0;
  border:1px solid var(--world-line);
  border-radius:var(--world-radius);
  background:linear-gradient(180deg,var(--world-learning-alt),var(--world-learning));
  box-shadow:var(--world-shadow);
}
body[data-app="mental"] .box>.row{
  min-height:58px;
  padding:9px 14px;
  border-bottom:1px solid var(--world-line);
  background:rgba(7,20,39,.14);
}
body[data-app="mental"] .displayArea{
  height:clamp(220px,38vh,340px);
}
body[data-app="mental"] #choices{inset:10px 14px;gap:0}
body[data-app="mental"] .choice{
  border:0;
  border-top:1px solid var(--world-line-soft);
  border-radius:0;
  background:rgba(7,20,39,.24);
}
body[data-app="mental"] .choice:nth-child(even){border-left:1px solid var(--world-line-soft)}
body[data-app="mental"] .choice.correct{
  opacity:1;
  border:1px solid rgba(34,197,94,.9);
  background:rgba(34,197,94,.28);
}
body[data-app="mental"] .choice.wrong{
  opacity:1;
  border:1px solid rgba(239,68,68,.9);
  background:rgba(239,68,68,.28);
}
body[data-app="mental"] #msg{margin:0;padding:8px 14px;min-height:38px}
body[data-app="mental"] #hint{
  height:58px;
  padding:6px 14px 10px;
  border-top:1px solid var(--world-line-soft);
}
body[data-app="mental"] #hint div{border:0;background:transparent;padding:2px 5px}
body[data-app="mental"] input{
  border-color:rgba(148,197,221,.22);
  background:rgba(3,14,30,.44);
}

/* 英語速読：設定・本文・選択肢・履歴を一枚の学習面で分割 */
body[data-app="speed"] .word-box{
  overflow:hidden;
  padding:0 0 42px;
  gap:0;
  border:1px solid var(--world-line);
  border-radius:var(--world-radius);
  background:linear-gradient(180deg,var(--world-learning-alt),var(--world-learning));
  box-shadow:var(--world-shadow);
}
body[data-app="speed"] .word-box.is-startable:active{box-shadow:var(--world-shadow)}
body[data-app="speed"] .top-controls{
  min-height:56px;
  padding:10px 18px;
  border-bottom:1px solid var(--world-line);
  background:rgba(7,20,39,.14);
}
body[data-app="speed"] .word-area{padding:22px clamp(18px,4vw,42px)}
body[data-app="speed"] .quiz-area{
  padding:18px clamp(16px,3vw,32px) 12px;
  gap:12px;
}
body[data-app="speed"] .quiz-title{text-align:center}
body[data-app="speed"] .choices{gap:0}
body[data-app="speed"] .choice-btn{
  min-height:clamp(64px,11dvh,96px);
  border:0;
  border-top:1px solid var(--world-line);
  border-radius:0;
  background:rgba(7,20,39,.22);
}
body[data-app="speed"] .choice-btn:nth-child(even){border-left:1px solid var(--world-line)}
body[data-app="speed"] .choice-btn.is-correct{
  opacity:1;
  border:1px solid rgba(34,197,94,.9);
  background:rgba(34,197,94,.28);
}
body[data-app="speed"] .choice-btn.is-wrong{
  opacity:1;
  border:1px solid rgba(239,68,68,.9);
  background:rgba(239,68,68,.28);
}
body[data-app="speed"] .result-history{
  min-height:54px;
  max-height:54px;
  padding:7px 18px;
  border-top:1px solid var(--world-line-soft);
}
body[data-app="speed"] .result-history div{
  border:0;
  border-radius:0;
  padding:3px 5px;
  background:transparent;
  box-shadow:none;
}
@media(max-width:640px){
  body[data-app="mental"] .frame{width:min(calc(100% - 12px),620px)}
  body[data-app="mental"] .box{border-radius:16px}
  body[data-app="mental"] .box>.row{overflow-x:auto}
  body[data-app="speed"] .word-box{padding:0 0 40px;border-radius:16px}
  body[data-app="speed"] .top-controls{padding:9px 12px}
  body[data-app="speed"] .word-area{padding:18px 12px}
  body[data-app="speed"] .quiz-area{padding:14px 10px 8px}
}

/* モンスター狩り：学習面だけ濃く、ゲーム情報は背景を透かす */
body[data-app="hunt"] #wrap{gap:10px;padding:8px clamp(8px,2vw,20px)}
body[data-app="hunt"] #appTop{padding:3px 2px 8px}
body[data-app="hunt"] #topGrid{gap:10px}
body[data-app="hunt"] .panel{border:0;border-radius:0;background:transparent;box-shadow:none}
body[data-app="hunt"] :is(#heroBox,#enemyBox){
  padding:8px 10px;
  border-bottom:1px solid var(--world-line-soft);
  background:var(--world-game);
  backdrop-filter:blur(3px);
}
body[data-app="hunt"] :is(#heroBox,#enemyBox) .row:last-child{margin-bottom:0}
body[data-app="hunt"] #qaBox{
  overflow:hidden;
  min-height:34vh;
  padding:0;
  border:1px solid var(--world-line);
  border-radius:var(--world-radius);
  background:linear-gradient(180deg,var(--world-learning-alt),var(--world-learning));
  box-shadow:var(--world-shadow);
}
body[data-app="hunt"] #question{
  min-height:74px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin:0;
  padding:14px clamp(14px,3vw,28px);
  border-bottom:1px solid var(--world-line);
  text-align:center;
}
body[data-app="hunt"] #choices{gap:0}
body[data-app="hunt"] button.choice{
  border:0;
  border-radius:0;
  background:rgba(7,20,39,.2);
}
body[data-app="hunt"] button.choice+button.choice{border-top:1px solid var(--world-line-soft)}
body[data-app="hunt"] button.choice.correct{border:0;background:rgba(34,197,94,.26)}
body[data-app="hunt"] button.choice.wrong{border:0;background:rgba(239,68,68,.24)}
body[data-app="hunt"] #enemyView{padding:0;background:transparent}
body[data-app="hunt"] #enemyView img{filter:drop-shadow(0 16px 24px rgba(0,0,0,.38))}
body[data-app="hunt"] #logWrap{
  padding:5px 8px;
  border:0;
  border-top:1px solid var(--world-line-soft);
  border-radius:0;
  background:var(--world-game);
  backdrop-filter:blur(3px);
}

/* キャラステータス：一枚のグラス面を区切り線で分類 */
body[data-app="status"] #panel{
  width:min(960px,calc(100vw - 16px));
  padding:0;
  overflow:hidden;
}
body[data-app="status"] header{max-width:min(960px,calc(100vw - 16px))}
@media(max-width:720px){
  body[data-app="hunt"] #topGrid{grid-template-columns:1fr}
  body[data-app="hunt"] #heroBox{grid-row:auto}
  body[data-app="hunt"] #enemyBox{grid-row:auto}
  body[data-app="hunt"] #qaBox{grid-row:auto}
  body[data-app="hunt"] #enemyView{grid-row:auto}
  body[data-app="hunt"] #enemyView img{max-height:24vh}
}

/* 全アプリ共通：画面上端に固定したタイトルバー */
:root{--world-topbar-height:58px}
body.world-app :is(.topbar,.top-bar,#appTop),
body.world-app[data-app="status"] header{
  position:fixed;
  inset:0 0 auto;
  z-index:100;
  width:100%!important;
  max-width:none!important;
  height:var(--world-topbar-height);
  min-height:var(--world-topbar-height);
  margin:0;
  padding-block:0!important;
  border:0;
  border-bottom:1px solid var(--world-line);
  border-radius:0!important;
  background:rgba(3,12,28,.76);
  box-shadow:0 5px 18px rgba(0,0,0,.2);
  backdrop-filter:blur(8px) saturate(110%);
  -webkit-backdrop-filter:blur(8px) saturate(110%);
}
body.world-app :is(.topbar-inner,.top-bar-inner){
  width:min(1100px,100%);
  height:100%;
  flex-wrap:nowrap;
}
body.world-app[data-app="mental"] .topbar,
body.world-app[data-app="hunt"] #appTop,
body.world-app[data-app="status"] header{
  justify-content:space-between;
  padding-inline:clamp(12px,3vw,24px)!important;
}
body.world-app :is(.app-title,.title,#title,#pageTitle),
body.world-app[data-app="status"] h1{
  min-width:0;
  margin:0;
  overflow:hidden;
  font-size:clamp(17px,3vw,22px)!important;
  line-height:1.2;
  white-space:nowrap;
  text-overflow:ellipsis;
}
body.world-app :is(.back-link,.back,.back-btn,#backBtn){
  flex:0 0 auto;
  min-height:34px;
  padding:6px 10px!important;
  border:1px solid var(--world-line)!important;
  border-radius:8px!important;
  background:rgba(7,24,43,.58)!important;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08)!important;
  transition:background-color .15s ease,border-color .15s ease,transform .08s ease;
}
body.world-app :is(.back-link,.back,.back-btn,#backBtn):hover{
  color:var(--world-cyan)!important;
  border-color:rgba(113,234,255,.62)!important;
  background:rgba(9,38,58,.72)!important;
}
body.world-app :is(.back-link,.back,.back-btn,#backBtn):active{transform:scale(.98)}
body[data-app="fc-tex"] .page,
body[data-app="fc-en"] .page,
body[data-app="mental"] .page,
body[data-app="speed"] .page,
body[data-app="status"] .page{
  padding-top:calc(var(--world-topbar-height) + 12px);
}
body[data-app="hunt"] #wrap{
  grid-template-rows:minmax(0,1fr) auto;
  padding-top:calc(var(--world-topbar-height) + 8px);
}
/* 共通グラス仕様：補助UIは薄く、学習面は濃く */
:root{
  --world-glass-thin-bg:linear-gradient(180deg,rgba(12,31,51,.24),rgba(3,14,30,.14));
  --world-glass-thin-line:rgba(181,224,241,.18);
  --world-glass-thin-shadow:0 7px 20px rgba(0,0,0,.14),inset 0 1px 0 rgba(255,255,255,.06);
  --world-glass-deep-bg:linear-gradient(160deg,rgba(5,20,39,.82),rgba(2,10,24,.88));
  --world-glass-deep-line:rgba(181,224,241,.34);
  --world-glass-deep-shadow:0 18px 44px rgba(0,0,0,.34),inset 0 1px 0 rgba(255,255,255,.08),inset 0 0 0 1px rgba(27,107,137,.08);
}
.world-glass-thin{
  border:1px solid var(--world-glass-thin-line);
  background:var(--world-glass-thin-bg);
  box-shadow:var(--world-glass-thin-shadow);
  backdrop-filter:blur(6px) saturate(106%);
  -webkit-backdrop-filter:blur(6px) saturate(106%);
}
.world-glass-deep{
  border:1px solid var(--world-glass-deep-line);
  background:var(--world-glass-deep-bg);
  box-shadow:var(--world-glass-deep-shadow);
  backdrop-filter:blur(12px) saturate(112%);
  -webkit-backdrop-filter:blur(12px) saturate(112%);
}
body.world-app :is(.topbar,.top-bar,#appTop),
body.world-app[data-app="status"] header,
body.world-app[data-app="index"] header{
  border-bottom-color:var(--world-glass-thin-line);
  background:rgba(5,18,34,.24);
  box-shadow:0 4px 14px rgba(0,0,0,.12);
  backdrop-filter:blur(7px) saturate(106%);
  -webkit-backdrop-filter:blur(7px) saturate(106%);
}
body.world-app :is(.back-link,.back,.back-btn,#backBtn,.github-button){
  border-color:var(--world-glass-thin-line)!important;
  background:rgba(8,27,45,.32)!important;
  box-shadow:0 3px 10px rgba(0,0,0,.12),inset 0 1px 0 rgba(255,255,255,.06)!important;
}
body.world-app :is(.back-link,.back,.back-btn,#backBtn,.github-button):hover{
  border-color:rgba(113,234,255,.52)!important;
  background:rgba(10,43,63,.5)!important;
  box-shadow:0 5px 14px rgba(0,0,0,.16),0 0 12px rgba(113,234,255,.1)!important;
}

/* 各科目フラッシュカード */
body[data-app="fc-tex"] .flashcard{
  display:flex;
  flex-direction:column;
  gap:10px;
  overflow:visible;
  border:0;
  background:transparent;
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="fc-tex"] .category-row{
  border:1px solid var(--world-glass-thin-line);
  border-radius:14px;
  background:var(--world-glass-thin-bg);
  box-shadow:var(--world-glass-thin-shadow);
  backdrop-filter:blur(6px) saturate(106%);
  -webkit-backdrop-filter:blur(6px) saturate(106%);
}
body[data-app="fc-tex"] .qa{
  overflow:hidden;
  border:1px solid var(--world-glass-deep-line);
  border-radius:var(--world-radius);
  background:var(--world-glass-deep-bg);
  box-shadow:var(--world-glass-deep-shadow);
  backdrop-filter:blur(12px) saturate(112%);
  -webkit-backdrop-filter:blur(12px) saturate(112%);
}

/* 英単語・例文 */
body[data-app="fc-en"] .card{
  overflow:visible;
  border:0;
  background:transparent;
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="fc-en"] .category-row{
  margin-bottom:10px;
  border:1px solid var(--world-glass-thin-line);
  border-radius:14px;
  background:var(--world-glass-thin-bg);
  box-shadow:var(--world-glass-thin-shadow);
  backdrop-filter:blur(6px) saturate(106%);
  -webkit-backdrop-filter:blur(6px) saturate(106%);
}
body[data-app="fc-en"] .term-mean,
body[data-app="fc-en"] .phrases{
  border-color:var(--world-glass-deep-line);
  background:var(--world-glass-deep-bg);
  backdrop-filter:blur(12px) saturate(112%);
  -webkit-backdrop-filter:blur(12px) saturate(112%);
}
body[data-app="fc-en"] .term-mean{
  border:1px solid var(--world-glass-deep-line);
  border-bottom-color:var(--world-line-soft);
  border-radius:var(--world-radius) var(--world-radius) 0 0;
  box-shadow:var(--world-glass-deep-shadow);
}
body[data-app="fc-en"] .phrases{
  overflow:hidden;
  border:1px solid var(--world-glass-deep-line);
  border-top:0;
  border-radius:0 0 var(--world-radius) var(--world-radius);
  box-shadow:0 18px 44px rgba(0,0,0,.28);
}

/* フラッシュ暗算 */
body[data-app="mental"] .box{
  overflow:visible;
  border:0;
  background:transparent;
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="mental"] .box>.row,
body[data-app="mental"] :is(#msg,#hint){
  border:1px solid var(--world-glass-thin-line);
  background:var(--world-glass-thin-bg);
  box-shadow:var(--world-glass-thin-shadow);
  backdrop-filter:blur(6px) saturate(106%);
  -webkit-backdrop-filter:blur(6px) saturate(106%);
}
body[data-app="mental"] .box>.row{margin-bottom:10px;border-radius:14px}
body[data-app="mental"] .displayArea{
  border-color:var(--world-glass-deep-line);
  background:var(--world-glass-deep-bg);
  backdrop-filter:blur(12px) saturate(112%);
  -webkit-backdrop-filter:blur(12px) saturate(112%);
}
body[data-app="mental"] .displayArea{
  border:1px solid var(--world-glass-deep-line);
  border-radius:var(--world-radius);
  box-shadow:var(--world-glass-deep-shadow);
}
body[data-app="mental"] #msg{margin-top:10px;border-bottom:0;border-radius:14px 14px 0 0}
body[data-app="mental"] #hint{border-top-color:var(--world-line-soft);border-radius:0 0 14px 14px}

/* 英語速読 */
body[data-app="speed"] .word-box{
  overflow:visible;
  border:0;
  background:transparent;
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="speed"] .top-controls,
body[data-app="speed"] .result-history{
  border:1px solid var(--world-glass-thin-line);
  border-radius:14px;
  background:var(--world-glass-thin-bg);
  box-shadow:var(--world-glass-thin-shadow);
  backdrop-filter:blur(6px) saturate(106%);
  -webkit-backdrop-filter:blur(6px) saturate(106%);
}
body[data-app="speed"] .top-controls{margin-bottom:10px}
body[data-app="speed"] :is(.word-area,.quiz-area){
  overflow:hidden;
  border:1px solid var(--world-glass-deep-line);
  border-radius:var(--world-radius);
  background:var(--world-glass-deep-bg);
  box-shadow:var(--world-glass-deep-shadow);
  backdrop-filter:blur(12px) saturate(112%);
  -webkit-backdrop-filter:blur(12px) saturate(112%);
}
body[data-app="speed"] .result-history{margin-top:10px}

/* モンスター狩りとステータス */
body[data-app="hunt"] :is(#heroBox,#enemyBox,#logWrap),
body[data-app="status"] #panel{
  border:1px solid var(--world-glass-thin-line);
  background:var(--world-glass-thin-bg);
  box-shadow:var(--world-glass-thin-shadow);
  backdrop-filter:blur(6px) saturate(106%);
  -webkit-backdrop-filter:blur(6px) saturate(106%);
}
body[data-app="hunt"] :is(#heroBox,#enemyBox){border-radius:12px}
body[data-app="hunt"] #logWrap{border-radius:12px}
body[data-app="hunt"] #qaBox{
  border:1px solid var(--world-glass-deep-line);
  background:var(--world-glass-deep-bg);
  box-shadow:var(--world-glass-deep-shadow);
  backdrop-filter:blur(12px) saturate(112%);
  -webkit-backdrop-filter:blur(12px) saturate(112%);
}
body[data-app="status"] #panel{border-radius:16px}

/* トップページは補助情報のみなので薄いグラスへ統一 */
body[data-app="index"] .wrap{padding-top:76px}
body[data-app="index"] .sitemap-group{
  border-color:var(--world-glass-thin-line);
  background:var(--world-glass-thin-bg);
  box-shadow:var(--world-glass-thin-shadow);
  backdrop-filter:blur(6px) saturate(106%);
  -webkit-backdrop-filter:blur(6px) saturate(106%);
}
body[data-app="index"] .sitemap h2{border-bottom-color:var(--world-glass-thin-line);background:rgba(5,18,34,.14)}
/* 学習面の単一枠化：内部は区切り線のみ */
body[data-app="fc-tex"] .flashcard,
body[data-app="fc-en"] .card,
body[data-app="mental"] .box,
body[data-app="speed"] .word-box{
  overflow:hidden;
  border:1px solid var(--world-glass-deep-line);
  border-radius:var(--world-radius);
  background:var(--world-glass-deep-bg);
  box-shadow:var(--world-glass-deep-shadow);
  backdrop-filter:blur(12px) saturate(112%);
  -webkit-backdrop-filter:blur(12px) saturate(112%);
}
body[data-app="fc-tex"] .flashcard{display:block}
body[data-app="fc-tex"] .category-row,
body[data-app="fc-en"] .category-row{
  margin:0;
  border:0;
  border-bottom:1px solid var(--world-line);
  border-radius:0;
  background:rgba(12,31,51,.16);
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="fc-tex"] .qa,
body[data-app="fc-en"] .term-mean,
body[data-app="fc-en"] .phrases{
  border:0;
  border-radius:0;
  background:transparent;
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="fc-en"] .term-mean{border-bottom:1px solid var(--world-line-soft)}

body[data-app="mental"] .box>.row,
body[data-app="mental"] :is(.displayArea,#msg,#hint){
  margin:0;
  border:0;
  border-radius:0;
  background:transparent;
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="mental"] .box>.row{border-bottom:1px solid var(--world-line)}
body[data-app="mental"] #msg{border-bottom:1px solid var(--world-line-soft)}

body[data-app="speed"] :is(.top-controls,.word-area,.quiz-area,.result-history){
  margin:0;
  border:0;
  border-radius:0;
  background:transparent;
  box-shadow:none;
  backdrop-filter:none;
}
body[data-app="speed"] .top-controls{border-bottom:1px solid var(--world-line)}
body[data-app="speed"] .result-history{border-top:1px solid var(--world-line-soft)}
/* 単一枠化の互換補正 */
body[data-app="fc-tex"] .qa,
body[data-app="fc-en"] :is(.category-row,.term-mean,.phrases),
body[data-app="mental"] :is(.box>.row,.displayArea,#msg,#hint),
body[data-app="speed"] :is(.top-controls,.word-area,.quiz-area,.result-history){
  -webkit-backdrop-filter:none;
}
body[data-app="speed"] .word-box{padding:0}
/* 戻る操作は全ページで同じ外観に統一 */
body.world-app :is(.back-link,.back,.back-btn,#backBtn){
  display:inline-flex!important;
  align-items:center;
  justify-content:center;
  gap:6px;
  min-height:34px;
  font-size:14px;
  line-height:1.2;
  white-space:nowrap;
}