:root{
  --paper:#f6f2ea; --paper-2:#efe9dd; --card:#fffdf9; --ink:#2b2724; --ink-soft:#6b645c;
  --ember:#b5734a; --ember-d:#94582f; --ember-t:#f4e6da; --line:#e2d9c9;
  --ok:#3d7a5a; --ok-t:#e3f0e8; --ng:#b8432f; --ng-t:#f6e4df; --indigo:#2e4a6b; --indigo-t:#e4e9ef;
  --radius:10px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--paper);color:var(--ink)}
body{font-family:'Noto Sans JP',sans-serif;font-size:16px;line-height:1.8;min-height:100vh;display:flex;flex-direction:column;word-break:normal;line-break:strict}
button{font:inherit;cursor:pointer}
.serif{font-family:'Noto Serif JP',serif}
.katex{white-space:nowrap}

/* 上の帯 */
.top{display:flex;align-items:center;gap:24px;padding:12px 28px;background:var(--ink);color:#f6f2ea}
.brand{display:flex;align-items:center;gap:10px}
.brand .mark{width:30px;height:30px;border-radius:6px;background:var(--ember);display:grid;place-items:center;font-family:'Noto Serif JP',serif;font-weight:700}
.brand .name{font-family:'Noto Serif JP',serif;font-weight:700;letter-spacing:.06em}
.brand .proto{font-size:12px;border:1px solid rgba(246,242,234,.5);border-radius:4px;padding:0 6px}
.top .subject{font-weight:700;padding-left:18px;border-left:1px solid rgba(246,242,234,.25)}
select.subject{font:inherit;font-weight:700;color:#f6f2ea;background:transparent;border:0;border-left:1px solid rgba(246,242,234,.25);padding:4px 8px 4px 18px;cursor:pointer}
select.subject option{color:#2b2724;background:#f6f2ea}
.top .today{margin-left:auto;font-size:14px;opacity:.9}
.devbar{display:flex;align-items:center;gap:8px;padding:4px 8px;border:1px dashed rgba(246,242,234,.4);border-radius:8px}
.devlabel{font-size:12px;opacity:.75}
.devbar .ghost{background:transparent;color:#f6f2ea;border:1px solid rgba(246,242,234,.4);border-radius:6px;padding:2px 10px;font-size:13px}
.devbar .ghost:hover{background:rgba(246,242,234,.12)}

.layout{flex:1;display:grid;grid-template-columns:300px minmax(0,1fr);gap:0}
.side{border-right:1px solid var(--line);padding:22px 18px;background:var(--paper-2);overflow-y:auto;max-height:calc(100vh - 54px);position:sticky;top:0}
.main{padding:28px 40px 60px;max-width:980px;width:100%}
.foot{font-size:12.5px;color:var(--ink-soft);padding:12px 28px;border-top:1px solid var(--line);background:var(--paper-2)}

/* 単元の一覧 */
.side h2{font-size:13px;letter-spacing:.12em;color:var(--ink-soft);margin-bottom:10px}
.ch{margin-bottom:14px}
.ch > .chname{font-family:'Noto Serif JP',serif;font-weight:700;font-size:15px;margin-bottom:4px;display:flex;justify-content:space-between;align-items:baseline}
.ch.locked > .chname{color:var(--ink-soft)}
.ch .soon{font-family:'Noto Sans JP';font-weight:400;font-size:11.5px;color:var(--ink-soft)}
.sec{font-size:12px;color:var(--ink-soft);margin:6px 0 2px 2px}
.unit{display:grid;grid-template-columns:22px 1fr auto;gap:6px;align-items:center;padding:6px 8px;border-radius:8px;font-size:14px;line-height:1.5}
.unit.open{cursor:pointer}
.unit.open:hover{background:var(--card)}
.unit.cur{background:var(--card);box-shadow:inset 3px 0 0 var(--ember)}
.unit.locked{color:#a39b90;font-size:13px}
.star{background:none;border:none;font-size:16px;line-height:1;color:#c9bfb0}
.star.on{color:var(--ember)}
.dots{display:flex;gap:2px}
.dot{width:7px;height:7px;border-radius:50%;background:#ddd3c3}
.dot.on{background:var(--ember)}
.badge{font-size:11px;border-radius:4px;padding:0 6px;white-space:nowrap}
.badge.pass{background:var(--ok-t);color:var(--ok)}
.badge.learn{background:var(--ember-t);color:var(--ember-d)}
.side .legend{font-size:12px;color:var(--ink-soft);margin-top:14px;line-height:1.7}

/* 共通の部品 */
h1.title{font-family:'Noto Serif JP',serif;font-size:26px;line-height:1.5;margin-bottom:6px}
.kicker{font-size:13px;letter-spacing:.14em;color:var(--ember-d);font-weight:700}
.lead{color:var(--ink-soft);margin-bottom:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin-bottom:18px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.btn{background:var(--ember);color:#fff;border:none;border-radius:8px;padding:10px 22px;font-weight:700;font-size:15px}
.btn:hover{background:var(--ember-d)}
.btn.sub{background:var(--card);color:var(--ink);border:1px solid var(--line);font-weight:500}
.btn.sub:hover{background:var(--paper-2)}
.btn.indigo{background:var(--indigo)}
.btn[disabled]{opacity:.45;cursor:default}
.linkbtn{background:none;border:none;color:var(--ink-soft);text-decoration:underline;font-size:13px}
.muted{color:var(--ink-soft);font-size:14px}
.small{font-size:13px}

/* ホーム */
.plan{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:8px}
.plan .card{margin:0;display:flex;flex-direction:column;gap:10px}
.plan .num{font-family:'Noto Serif JP',serif;font-size:13px;color:var(--ember-d);letter-spacing:.1em}
.plan h3{font-size:19px;line-height:1.5}
.plan .card .btn{align-self:flex-start;margin-top:auto}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px 16px}
.stat .v{font-size:24px;font-weight:700;font-family:'Noto Serif JP',serif}
.stat .k{font-size:12.5px;color:var(--ink-soft)}
table.prog{width:100%;border-collapse:collapse;font-size:14px}
table.prog th{font-weight:500;color:var(--ink-soft);font-size:12.5px;text-align:left;padding:6px 8px;border-bottom:1px solid var(--line)}
table.prog td{padding:9px 8px;border-bottom:1px solid var(--line);vertical-align:middle}
.famdots{display:flex;gap:10px}
.famdots .fd{display:flex;gap:2px}

/* 学ぶ流れ */
.stepper{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin:14px 0 22px}
.step{font-size:13px;padding:8px 10px;border-radius:8px;background:var(--paper-2);color:var(--ink-soft);line-height:1.4}
.step b{display:block;font-size:11.5px;letter-spacing:.1em}
.step.now{background:var(--ember);color:#fff}
.step.done{background:var(--ember-t);color:var(--ember-d)}
.goals{margin:0 0 18px 1.2em;font-size:15px}

.summary{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:22px;align-items:start}
.summary.nofig{grid-template-columns:1fr}
.point{padding:12px 0;border-bottom:1px dashed var(--line)}
.point:last-child{border-bottom:none}
.point h4{font-size:16.5px;margin-bottom:2px}
.point h4::before{content:'';display:inline-block;width:8px;height:8px;background:var(--ember);border-radius:2px;margin-right:8px;vertical-align:middle}
.figure{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.figure .cap{font-size:14px;color:var(--ink-soft);margin-top:10px}
.area{display:grid;gap:3px;font-size:17px;margin:0 auto;width:max-content}
.area .h{color:var(--ink-soft);display:grid;place-items:center;padding:4px 10px}
.area .c{background:var(--ember-t);border:1px solid #e6cdb8;display:grid;place-items:center;border-radius:4px}
.sets{border:2px solid var(--indigo);border-radius:14px;padding:10px 12px 12px;background:var(--indigo-t)}
.sets .sets{background:var(--card);margin-top:6px}
.sets .sets .sets{background:var(--indigo-t)}
.sets .sets .sets .sets{background:var(--card)}
.sets .nm{font-weight:700;font-size:14px;color:var(--indigo)}
.sets .ex{font-size:13px;color:var(--ink-soft);margin-left:8px}

/* 問題 */
.q{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px 28px;margin-bottom:16px}
.q .meta{font-size:12.5px;color:var(--ink-soft);margin-bottom:6px;display:flex;gap:10px}
.q .prompt{font-size:18px;margin-bottom:16px;white-space:pre-line}
.blank{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 12px;align-items:center;margin-bottom:12px}
.blank .lab{font-size:15px;min-width:0}
.blank input[type=text]{font:inherit;font-size:18px;padding:8px 12px;border:1.5px solid var(--line);border-radius:8px;background:#fff;width:100%;max-width:420px}
.blank input[type=text]:focus{outline:none;border-color:var(--ember)}
.blank .pv{grid-column:2;font-size:15px;color:var(--ink-soft);min-height:24px}
.choices{display:flex;gap:10px;flex-wrap:wrap}
.choice{border:1.5px solid var(--line);background:#fff;border-radius:8px;padding:6px 18px;font-size:17px;min-width:64px}
.choice.sel{border-color:var(--ember);background:var(--ember-t)}
.keypad{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 16px}
.keypad button{border:1px solid var(--line);background:var(--paper);border-radius:6px;padding:3px 0;width:44px;font-size:15px}
.keypad button:hover{background:var(--ember-t)}
.keypad .wide{width:auto;padding:3px 10px}
.answerbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;border-top:1px solid var(--line);padding-top:14px}
.answerbar .ask{font-size:14px;color:var(--ink-soft);margin-right:4px}
.hintbox{background:var(--indigo-t);border-radius:8px;padding:10px 14px;margin-bottom:12px;font-size:15px}
.fb{border-radius:var(--radius);padding:18px 24px;margin-bottom:16px;border:1px solid}
.fb.ok{background:var(--ok-t);border-color:#bcd9c7}
.fb.ng{background:var(--ng-t);border-color:#e7c3b9}
.fb .res{font-weight:700;font-size:18px;margin-bottom:6px}
.fb.ok .res{color:var(--ok)}
.fb.ng .res{color:var(--ng)}
.fb .warn{background:#fff;border-left:4px solid var(--ng);padding:8px 12px;margin:8px 0;font-size:15px}
.fb ol{margin:6px 0 4px 1.3em}
.fb ol li{margin:3px 0}
.fb .ans{margin:4px 0 8px}
.why{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px 16px;margin-top:12px}
.why textarea,.recall textarea{width:100%;font:inherit;border:1.5px solid var(--line);border-radius:8px;padding:10px 12px;margin:8px 0;resize:vertical}
.why .key{background:var(--paper-2);border-radius:6px;padding:8px 12px;margin:8px 0;font-size:15px}
.steps{list-style:none;counter-reset:s}
.steps li{counter-increment:s;padding:10px 0 10px 40px;position:relative;border-bottom:1px dashed var(--line)}
.steps li::before{content:counter(s);position:absolute;left:0;top:10px;width:26px;height:26px;border-radius:50%;background:var(--ember-t);color:var(--ember-d);display:grid;place-items:center;font-size:13px;font-weight:700}
.steps li .m{display:block;margin-top:4px;font-size:17px}
.steps li.hidden{display:none}
.steps li.todo{background:#fffaf3}
.recall .kp{display:grid;grid-template-columns:28px 1fr auto;gap:8px;align-items:center;padding:8px 0;border-bottom:1px dashed var(--line)}
.recall .kp .mk{font-weight:700}
.recall .kp.hit .mk{color:var(--ok)}
.recall .kp.miss .mk{color:var(--ng)}
.recall .kp.miss .lb{background:#fff6ef}
.progressline{height:6px;background:var(--paper-2);border-radius:3px;overflow:hidden;margin:4px 0 18px}
.progressline > div{height:100%;background:var(--ember)}
.notice{background:var(--ember-t);border-radius:8px;padding:12px 16px;margin-bottom:16px;font-size:15px}
.report{margin-top:6px;text-align:right}

/* ---------- 図の型（11/5）・読解の文章 ---------- */
.figure .ftitle{font-weight:700;font-size:14px;margin-bottom:8px}
.figure svg{display:block;margin:0 auto}
.q .figure{margin-bottom:14px}
table.ftable{border-collapse:collapse;font-size:14.5px;margin:0 auto;background:#fff}
table.ftable th,table.ftable td{border:1px solid var(--line);padding:6px 12px;text-align:center}
table.ftable th{background:var(--paper-2);font-weight:700}
.sent{display:flex;flex-wrap:wrap;gap:6px 4px;font-size:18px;justify-content:center;padding:4px 0}
.sent .sw{display:inline-flex;flex-direction:column;align-items:center}
.sent .w{border-bottom:3px solid;padding:0 6px 2px}
.sent .r{font-size:12.5px;font-weight:700;margin-top:3px}
.kanbun{display:flex;flex-direction:row-reverse;justify-content:center;gap:30px;font-family:'Noto Serif JP',serif;font-size:28px;padding:8px 0}
.kanbun .kl{display:flex;flex-direction:column}
.kanbun .kc{position:relative;width:1.15em;height:1.4em;line-height:1.4em;text-align:center}
.kanbun .ok{position:absolute;left:100%;top:.8em;font-size:13px;line-height:1.05;writing-mode:vertical-rl;margin-left:1px;font-family:'Noto Sans JP',sans-serif}
.kanbun .kt{position:absolute;right:100%;bottom:-.1em;font-size:13px;line-height:1;margin-right:1px;color:var(--ember-d);font-family:'Noto Sans JP',sans-serif}
img.fimg{display:block;max-width:min(100%,560px);max-height:380px;width:auto;margin:0 auto}
.passage{background:#fff;border:1px solid var(--line);border-left:4px solid var(--indigo);border-radius:8px;padding:16px 20px;margin-bottom:16px;max-height:max(420px,min(620px,62vh));overflow-y:auto;font-size:16px;line-height:1.95}
.passage.en{font-family:Georgia,'Noto Serif JP',serif;line-height:1.75}
.passage .ptitle{font-weight:700;margin-bottom:6px}
.passage p{margin:0 0 8px;text-indent:1em;position:relative}
.passage.en p{text-indent:0}
.passage .pn{position:absolute;left:-1.1em;text-indent:0;font-size:11.5px;color:var(--ink-soft);top:.35em}
.passage .bou{text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:4px}
.passage .bou sup{font-size:11px;font-weight:700;color:var(--ember-d);margin-left:1px}
.passage .kuu{display:inline-block;min-width:2.6em;border:1.5px solid var(--ink);text-align:center;font-size:13px;line-height:1.5;margin:0 3px;text-indent:0}
.passage .pnote{font-size:12.5px;color:var(--ink-soft);margin-top:10px;text-indent:0}
.steps li,.fb ol li,.hintbox{white-space:pre-line}
.figure{overflow-x:auto;position:relative}
table.ftable.dense{font-size:12px}table.ftable.dense th,table.ftable.dense td{padding:4px 5px}

/* ログイン（sync.js）。ログインが済むまでは、横の単元一覧と科目・試作用の帯を隠す */
.auth-mode .side,.auth-mode .subject,.auth-mode .devbar,.auth-mode .today,.auth-mode .proto{display:none}
.auth-mode .layout{grid-template-columns:minmax(0,1fr)}
.auth{max-width:560px;margin:0 auto}
.auth .field{display:block;margin-bottom:14px}
.auth .field span{display:block;font-size:14px;font-weight:700;margin-bottom:6px}
.auth .field input{font:inherit;font-size:16px;padding:9px 12px;border:1.5px solid var(--line);border-radius:8px;background:#fff;width:100%}
.auth .field input:focus{outline:none;border-color:var(--ember)}
.auth-err{color:#a23b2a;font-size:14px;min-height:1em;margin:8px 0}
.auth .card p{margin-bottom:10px}
.top .logout{background:transparent;color:#f6f2ea;border:1px solid rgba(246,242,234,.4);border-radius:6px;padding:2px 10px;font-size:13px}

/* ---------- スマホ（11/5 公開の準備）。単元の一覧は上の「単元」ボタンで開く ---------- */
.sidetoggle{display:none}
.figure svg{max-width:100%;height:auto}
@media (max-width:760px){
  .top{flex-wrap:wrap;gap:6px 12px;padding:10px 16px}
  .brand .name{font-size:15px}
  select.subject{padding:4px 6px 4px 12px;max-width:52vw}
  .top .today{display:none}
  .devbar{flex-wrap:wrap;width:100%}
  .sidetoggle{display:inline-block;margin-left:auto;background:transparent;color:#f6f2ea;border:1px solid rgba(246,242,234,.4);border-radius:6px;padding:2px 10px;font-size:13px}
  .top .logout{margin-left:0}
  .layout{display:block}
  .side{display:none;position:static;max-height:none;border-right:none;border-bottom:1px solid var(--line);padding:16px}
  body.side-open .side{display:block}
  body.side-open .main{display:none}
  .main{padding:18px 16px 48px}
  .foot{padding:12px 16px}
  h1.title{font-size:22px}
  .card{padding:16px 16px}
  .plan{grid-template-columns:1fr;gap:12px}
  .stats{grid-template-columns:repeat(2,1fr);gap:8px}
  .stepper{grid-template-columns:repeat(5,minmax(0,1fr));gap:4px}
  .step{font-size:11.5px;padding:6px 4px;text-align:center}
  .step b{font-size:10px;letter-spacing:0}
  .summary,.summary.nofig{grid-template-columns:minmax(0,1fr)}
  .summary > *{min-width:0}
  .point,.steps li,.q .prompt,.fb,.hintbox,.why{overflow-x:auto;overflow-y:hidden}
  .katex-display{overflow-x:auto;overflow-y:hidden;padding-bottom:2px}
  .q{padding:16px 16px}
  .q .prompt{font-size:17px}
  .blank{grid-template-columns:1fr}
  .blank .pv{grid-column:1}
  .keypad button{width:40px;padding:6px 0}
  .fb{padding:14px 16px}
  .figure{padding:12px}
  .passage{padding:12px 14px 12px 22px}
  table.prog{display:block;overflow-x:auto}
  .kanbun{font-size:24px;gap:22px}
}