:root{
  --bg:#f5f4f0;
  --card:#ffffff;
  --ink:#23262b;
  --sub:#6b7280;
  --line:#e7e5df;
  --field:#fbfaf7;
  --accent:#f0efe9;
  --brand:#2E74B8;          /* 明るめの青：主要な操作（おぼタンのロゴ色と統一） */
  --brand-dark:#215585;
  --on-brand:#ffffff;
  --maru:#d8523f;           /* 朱：○＝正解（学校の赤ペンに合わせる） */
  --batsu:#4a5568;          /* 墨：×＝まちがえた */
  --ok:#2e9c6e;             /* 緑：接続できている印 */
  --maru-weak:rgba(216,82,63,.07);
  --ok-weak:rgba(46,156,110,.10);
  --line-strong:#b5b0a4;    /* 罫線のホバー時 */
  --shadow:0 1px 2px rgba(20,22,26,.04),0 8px 24px rgba(20,22,26,.06);
  --r:14px;
  --kyokasho:"UD デジタル教科書体 NK-R","UD Digi Kyokasho NK-R","BIZ UDMincho","Hiragino Mincho ProN","Yu Mincho",YuMincho,serif;
}
[data-theme="dark"]{
  --bg:#1e1e1e; --card:#2d2d2d; --ink:#e0e0e0; --sub:#aaaaaa; --line:#444444;
  --field:#262626; --accent:#3a3a3a;
  --brand:#79c7ff; --brand-dark:#9ad6ff; --on-brand:#0e2438;
  --maru:#ef6d5a; --batsu:#b9c2cf;
  --ok:#4fd39a; --maru-weak:rgba(239,109,90,.16); --ok-weak:rgba(79,211,154,.14);
  --line-strong:#6f6f6f;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{margin:0}
body{
  background:var(--bg); color:var(--ink);
  font-family:"Noto Sans JP",-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Segoe UI",sans-serif;
  line-height:1.6; -webkit-font-smoothing:antialiased;
  padding:calc(20px + env(safe-area-inset-top)) 16px calc(24px + env(safe-area-inset-bottom));
}
.wrap{max-width:460px;margin:0 auto}
body.playing header p{display:none}
body.playing header{margin-bottom:12px}
header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin:16px 2px 18px}
h1{font-size:1.3rem;font-weight:700;margin:0;letter-spacing:.02em;display:flex;align-items:center;gap:10px}
h1 .logo-text{position:relative;display:block}
h1 .furigana{position:absolute;left:0;bottom:100%;margin-bottom:1px;font-size:.44em;font-weight:500;color:var(--sub);letter-spacing:.28em;padding-left:.28em;white-space:nowrap;line-height:1}
h1 .kanji{display:block;font-size:1em;font-weight:900;letter-spacing:.08em;line-height:1}
h1 .ico{width:1.1em;height:1.1em;flex:none;color:var(--brand)}
header p{margin:4px 0 0;color:var(--sub);font-size:.82rem}
.btn-theme{display:flex;align-items:center;gap:6px;flex:none;background:var(--accent);border:1px solid var(--line);
  color:var(--sub);padding:5px 10px;border-radius:6px;cursor:pointer;font-family:inherit;font-size:12px;font-weight:700;
  -webkit-tap-highlight-color:transparent}
.btn-theme:hover{border-color:var(--line-strong);color:var(--ink)}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px 16px;margin-bottom:16px}
.label{font-size:.78rem;font-weight:700;color:var(--sub);letter-spacing:.04em;margin:0 0 8px}
.note{font-size:.78rem;color:var(--sub);margin:8px 0 0}
.empty{text-align:center;color:var(--sub);font-size:.88rem;padding:18px 4px}

input[type=text],select,textarea{font-family:inherit;font-size:1rem;color:var(--ink);background:var(--field);
  border:1px solid var(--line);border-radius:10px;padding:11px 10px;appearance:none;-webkit-appearance:none;
  min-width:0;width:100%}
textarea{line-height:1.7;resize:vertical;font-size:.92rem}
select{padding-right:26px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 7'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%236b7280' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 9px center}
[data-theme="dark"] select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 7'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23aaaaaa' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E")}
input:focus-visible,select:focus-visible,textarea:focus-visible,button:focus-visible{outline:2px solid var(--brand);outline-offset:2px}

button{font-family:inherit;-webkit-tap-highlight-color:transparent;cursor:pointer}
.big{width:100%;padding:16px;border:none;border-radius:12px;background:var(--brand);color:var(--on-brand);
  font-size:1.05rem;font-weight:700;transition:background .15s,transform .05s}
.big:hover{background:var(--brand-dark)}
.big:active{transform:scale(.99)}
.cbtn{flex:1;padding:12px;border-radius:10px;border:1px solid var(--brand);background:var(--card);color:var(--brand);
  font-weight:700;font-size:.9rem}
.cbtn:hover{background:var(--accent)}
.cbtn.primary{background:var(--brand);color:var(--on-brand);border-color:var(--brand)}
.cbtn.primary:hover{background:var(--brand-dark)}
.cbtn.quiet{border-color:var(--line);color:var(--sub)}
.cbtn.quiet:hover{border-color:var(--line-strong);color:var(--ink);background:var(--card)}
.btn-row{display:flex;gap:10px;margin-top:14px}
.linkbtn{display:block;margin:10px auto 0;background:none;border:none;color:var(--sub);font-size:.78rem;
  text-decoration:underline;padding:4px}
.linkbtn:hover{color:var(--maru)}

/* ---- セット一覧 ---- */
.setlist{display:flex;flex-direction:column;gap:8px}
.setrow{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:10px;
  background:var(--field);padding:10px 12px}
.setrow .info{flex:1;min-width:0}
.setrow .nm{font-weight:700;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.setrow .meta{font-size:.75rem;color:var(--sub)}
.badge{flex:none;font-size:.68rem;font-weight:700;letter-spacing:.06em;padding:3px 7px;border-radius:5px;
  background:var(--accent);color:var(--sub)}
.iconbtn{flex:none;border:1px solid var(--line);background:var(--card);color:var(--sub);border-radius:8px;
  padding:7px 10px;font-size:.78rem;font-weight:700}
.iconbtn:hover{border-color:var(--line-strong);color:var(--ink)}
.iconbtn.go{border-color:var(--brand);color:var(--brand)}

/* ---- 出題画面 ---- */
.status{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0 2px 12px;
  font-size:.78rem;font-weight:700;color:var(--sub);letter-spacing:.03em}
.status .time{font-variant-numeric:tabular-nums}
.bar{height:4px;border-radius:2px;background:var(--line);overflow:hidden;margin:0 2px 14px}
.bar span{display:block;height:100%;background:var(--brand);transition:width .25s}

.qcard{min-height:216px;display:flex;flex-direction:column;justify-content:center;text-align:center;padding:24px 16px}
.qkind{font-size:.72rem;font-weight:700;letter-spacing:.08em;color:var(--sub);margin:0 0 14px}
.qmain{font-size:2rem;font-weight:700;line-height:1.35;margin:0;word-break:break-word}
.qmain.kj{font-family:var(--kyokasho);font-weight:500;letter-spacing:.04em}
.qmain.en{font-family:"Georgia","Times New Roman",serif;letter-spacing:.01em}
.qsub{font-size:.9rem;color:var(--sub);margin:10px 0 0}
.qex{margin:16px 0 0;font-size:1.06rem;line-height:2;padding:12px;border-radius:10px;background:var(--field)}
.qex.kj{font-family:var(--kyokasho);letter-spacing:.03em}
.qex .mark{text-decoration:none;border-bottom:2px solid var(--maru);padding-bottom:1px}
.qex .blank{display:inline-block;min-width:5.5em;border-bottom:2px solid var(--sub);margin:0 .2em}

.answerbox{margin-top:4px}
.answerbox input{text-align:center;font-size:1.15rem;padding:14px 10px}
.reveal{margin:0;padding:16px 12px;border-radius:10px;background:var(--field);text-align:center}
.reveal .rl{font-size:.72rem;font-weight:700;letter-spacing:.08em;color:var(--sub);margin:0 0 6px}
.reveal .ra{font-size:1.7rem;font-weight:700;margin:0;word-break:break-word}
.reveal .ra.kj{font-family:var(--kyokasho);font-weight:500;letter-spacing:.04em}
.reveal .ra.en{font-family:"Georgia","Times New Roman",serif}
.reveal .rs{font-size:.88rem;color:var(--sub);margin:6px 0 0}
.okuri{color:var(--maru)}

.judge{display:flex;gap:10px;margin-top:14px}
.jbtn{flex:1;padding:15px 8px;border-radius:12px;font-size:.95rem;font-weight:700;display:flex;
  align-items:center;justify-content:center;gap:7px;border:2px solid transparent}
.jbtn svg{width:19px;height:19px;flex:none}
.jbtn.ok{background:var(--maru);color:#fff}
.jbtn.ok:hover{filter:brightness(.93)}
.jbtn.ng{background:var(--card);color:var(--batsu);border-color:var(--line)}
.jbtn.ng:hover{border-color:var(--batsu)}
.verdict{display:flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:1rem;margin:0 0 12px}
.verdict.ok{color:var(--maru)}
.verdict.ng{color:var(--batsu)}
.verdict svg{width:22px;height:22px}
.yourans{font-size:.85rem;color:var(--sub);margin:0 0 10px;text-align:center}
.yourans b{color:var(--ink);font-weight:700}

/* ---- 結果 ---- */
.score{text-align:center;padding:6px 0 2px}
.score .rate{font-size:3rem;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums}
.score .rate small{font-size:1.1rem;color:var(--sub);font-weight:700;margin-left:2px}
.score .detail{font-size:.85rem;color:var(--sub);margin:2px 0 0}
.misslist{margin:16px 0 0;border-top:1px solid var(--line);padding-top:12px}
.missrow{display:flex;gap:10px;align-items:baseline;padding:7px 0;border-bottom:1px dashed var(--line);font-size:.92rem}
.missrow .mq{font-weight:700;flex:none;max-width:52%;word-break:break-word}
.missrow .mq.kj{font-family:var(--kyokasho);font-weight:500;font-size:1.05rem}
.missrow .ma{color:var(--sub);font-size:.85rem;flex:1;text-align:right;word-break:break-word}

/* ---- 設定行 ---- */
.setting{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 0;border-bottom:1px solid var(--line)}
.setting:last-of-type{border-bottom:none}
.setting .st{font-size:.9rem;font-weight:500}
.setting select{width:auto;flex:none;min-width:112px}
.model-switcher{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;width:fit-content;flex:none}
.model-switcher button{background:var(--accent);border:none;color:var(--sub);padding:6px 16px;cursor:pointer;font-family:inherit;
  font-size:.82rem;font-weight:700;transition:all .15s;border-right:1px solid var(--line);-webkit-tap-highlight-color:transparent}
.model-switcher button:last-child{border-right:none}
.model-switcher button:hover{color:var(--ink)}
.model-switcher button[aria-pressed="true"]{background:var(--brand);color:var(--on-brand)}
.seg{display:flex;gap:0;border:1px solid var(--line);border-radius:9px;overflow:hidden;flex:none}
.seg button{border:none;background:var(--field);color:var(--sub);font-size:.82rem;font-weight:700;padding:8px 13px}
.seg button[aria-pressed="true"]{background:var(--brand);color:var(--on-brand)}
.stack{display:flex;flex-direction:column;gap:10px}
.foot{text-align:center;font-size:.72rem;color:var(--sub);margin-top:22px}
.footer-copyright{margin-top:22px;padding:14px 4px 0;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
.footer-copy-text{margin:0;font-size:.76rem;color:var(--sub)}
.footer-link{color:var(--sub);text-decoration:none;border-bottom:1px solid var(--line)}
.footer-link:hover{color:var(--brand);border-color:var(--brand)}
.footer-tools-link{font-size:.76rem;white-space:nowrap}
.linkbtn{display:block;margin:2px auto 0;background:none;border:none;color:var(--sub);
  font-size:.78rem;text-decoration:underline;cursor:pointer;padding:2px 0;font-family:inherit}
.linkbtn:hover{color:var(--maru)}
.about-list{margin:0;padding-left:1.1em}
.about-list li{font-size:.83rem;color:var(--sub);line-height:1.7;margin-bottom:8px}
.about-list li:last-child{margin-bottom:0}
.about-list b{color:var(--ink)}
.ver{margin:12px 0 0;padding-top:10px;border-top:1px solid var(--line);
  font-size:.74rem;color:var(--sub);font-variant-numeric:tabular-nums}
.ver b{font-family:"Roboto Mono",ui-monospace,monospace;font-weight:700;color:var(--ink)}

.aiblock{margin-top:14px}
.linklike{background:none;border:none;color:var(--brand);font-weight:700;font-size:.78rem;text-decoration:underline;padding:2px 0;margin-top:2px;text-align:left}
.linklike:disabled{color:var(--sub);text-decoration:none;cursor:default}
.aiblock .note{margin:0 0 10px}

/* ---- AIキーの設定（アコーディオン） ---- */
details.acc{border:1px solid var(--line);border-radius:10px;background:var(--field);padding:0 12px}
details.acc>summary{cursor:pointer;list-style:none;padding:11px 0;font-size:.88rem;font-weight:700;color:var(--sub);
  display:flex;align-items:center;justify-content:space-between}
details.acc>summary::-webkit-details-marker{display:none}
details.acc>summary::after{content:"＋";font-weight:700;color:var(--sub)}
details.acc[open]>summary::after{content:"−"}
details.acc .inner{padding:2px 0 14px;display:flex;flex-direction:column;gap:10px}
.dot{flex:none;width:8px;height:8px;border-radius:50%;background:var(--line);display:inline-block;margin-right:7px}
.dot.on{background:var(--ok)}
.card>details.acc-section{border:none;background:transparent;padding:0}
.card>details.acc-section>summary{padding:0 0 2px;font-size:.78rem;font-weight:700;color:var(--sub);letter-spacing:.04em}
.card>details.acc-section[open]>summary{padding-bottom:10px}
.card>details.acc-section>.inner{padding-top:0}

/* ---- 進捗・お知らせ ---- */
.spin{display:inline-block;width:14px;height:14px;border:2px solid var(--line);border-top-color:var(--brand);
  border-radius:50%;animation:sp .7s linear infinite;vertical-align:-2px;margin-right:7px}
@keyframes sp{to{transform:rotate(360deg)}}
.msg{font-size:.82rem;padding:10px 12px;border-radius:9px;margin:0}
.msg.info{background:var(--field);color:var(--sub)}
.msg.err{background:var(--maru-weak);color:var(--maru);font-weight:700}
.msg.done{background:var(--ok-weak);color:var(--ok);font-weight:700}
.msgrow{display:flex;align-items:center;gap:10px;margin-top:10px}
.msgrow .msg{flex:1;min-width:0}
.msgrow .cbtn{flex:none;padding:10px 14px}

/* ---- 下書きの確認 ---- */
.rvbulk{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:14px 2px 12px;
  font-size:.8rem;color:var(--sub)}
.rvbulk button{background:none;border:none;color:var(--brand);font-weight:700;font-size:.8rem;
  text-decoration:underline;padding:2px}
.rvrow{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:8px;background:var(--card)}
.rvrow.warn{border-color:var(--maru);background:var(--maru-weak)}
.rvrow.off{opacity:.45}
.rvhead{display:flex;align-items:center;gap:9px;margin-bottom:8px}
.rvhead input[type=checkbox]{width:19px;height:19px;flex:none;accent-color:var(--brand)}
.rvhead .rq{font-weight:700;font-size:1.05rem;flex:1;min-width:0;word-break:break-word}
.rvhead .rq.kj{font-family:var(--kyokasho);font-weight:500;font-size:1.2rem}
.flag{flex:none;font-size:.66rem;font-weight:700;letter-spacing:.04em;padding:3px 7px;border-radius:5px;
  background:var(--maru);color:#fff}
.rvfield{display:flex;align-items:center;gap:8px;margin-top:6px}
.rvfield label{flex:none;width:3.4em;font-size:.72rem;font-weight:700;color:var(--sub)}
.rvfield input{font-size:.9rem;padding:8px 9px;background:var(--card)}
.rvnote{font-size:.74rem;color:var(--sub);margin:7px 0 0;line-height:1.6}
@media (prefers-reduced-motion:reduce){*{transition:none !important}}