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@media(max-width:760px){.foundation-grid{grid-template-columns:1fr}}
@media(max-width:760px){.base-jump{align-items:stretch;flex-direction:column}.base-jump button{width:100%}}
.challenge-button{width:100%;margin-top:12px;padding:15px;border:0;border-radius:14px;background:#263f3a;color:#fff;font-weight:900;cursor:pointer}.challenge-button:hover{background:#31564e}.challenge-score{display:flex;align-items:baseline;justify-content:center;gap:8px;margin:26px auto;padding:24px;border-radius:20px;background:#fff2cd;color:#7b5312}.challenge-score strong{font-family:serif;font-size:68px;line-height:1}.challenge-score span{font-weight:900}.result-list{display:grid;gap:9px;margin:26px 0}.result-list>div{display:grid;grid-template-columns:38px 1fr;align-items:center;gap:10px;padding:13px 15px;border-radius:13px;background:#edf5f0}.result-list>div.incorrect{background:#fff0dd}.result-list>div>b{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#4f8578;color:#fff}.result-list .incorrect>b{background:#ef6c4d}.result-list span{display:grid;gap:3px}.result-list small{color:#6f7d78}.review-links{display:grid;gap:9px;margin:32px 0;padding-top:24px;border-top:1px solid #ded8ca}.review-links button{display:grid;grid-template-columns:90px 1fr 18px;align-items:center;gap:10px;padding:14px;border:1px solid #d3e1d8;border-radius:13px;background:#fff;color:#21302e;text-align:left;cursor:pointer}.review-links button>span{color:#ef6c4d;font-size:11px;font-weight:900}.review-links button>b{color:#4f8578}.challenge-result{text-align:center}.challenge-result .result-list,.challenge-result .review-links{text-align:left}
@media(max-width:760px){.challenge-score strong{font-size:56px}.review-links button{grid-template-columns:78px 1fr 15px;font-size:12px}}
.session-progress{display:grid;grid-template-columns:1fr auto;align-items:end;gap:8px 14px;margin:4px 0 18px;padding:16px 18px;border-radius:15px;background:#263f3a;color:#fff}.session-progress>div:first-child{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.session-progress span{font-size:13px;font-weight:800}.session-progress span strong{color:#f8d96f;font-size:25px}.session-progress small{color:#b8d7ce}.session-bar{grid-column:1/2;height:7px;border-radius:9px;background:#ffffff2b;overflow:hidden}.session-bar i{display:block;height:100%;border-radius:9px;background:#f8d96f;transition:.35s}.session-progress button{grid-column:2;grid-row:1/3;border:0;background:none;color:#c8d9d4;font-size:11px;text-decoration:underline;cursor:pointer}.lesson-grid button.completed{border-color:#79a99d;background:#edf5f0}.lesson-grid button.completed>b{display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#4f8578;color:#fff}
@media(max-width:760px){.session-progress{grid-template-columns:1fr}.session-progress button{grid-column:1;grid-row:auto;justify-self:end}}
.support-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.support-actions button{min-height:44px;border:1px solid #d3e1d8;border-radius:11px;background:#f1f6f1;color:#315f55;font-size:12px;font-weight:900;cursor:pointer}.support-actions button:hover{border-color:#4f8578;background:#e8f1e8}.map-flow{display:grid;gap:18px;margin:30px 0}.map-level{padding:21px;border:1px solid #d3e1d8;border-radius:18px;background:#edf5f0}.map-level.foundation{border-color:#e5d8b8;background:#fff8e6}.map-lessons{display:grid;grid-template-columns:repeat(2,1fr);gap:7px}.map-lessons button{display:flex;align-items:center;gap:8px;padding:10px;border:0;border-radius:9px;background:#fff;color:#315f55;text-align:left;cursor:pointer}.map-lessons i{display:grid;place-items:center;flex:0 0 24px;height:24px;border-radius:50%;background:#ef6c4d;color:#fff;font-style:normal;font-size:11px;font-weight:900}.map-arrow{text-align:center;color:#71807a;font-size:12px;font-weight:900}.prerequisite-map{display:grid;grid-template-columns:1fr 1fr;gap:9px}.prerequisite-map section{margin:0;padding:12px;border:0;border-radius:11px;background:#fff;text-align:left}.base-title{display:flex;align-items:center;gap:9px;width:100%;padding:0;border:0;background:none;color:#21302e;text-align:left;cursor:pointer}.base-title>i{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:#f8d96f;font-style:normal;font-weight:900}.base-title>span{display:grid}.base-title small{color:#80775e}.prerequisite-map section>div{display:flex;flex-wrap:wrap;gap:5px;margin-top:10px}.prerequisite-map section>div button{padding:5px 7px;border:1px solid #d3e1d8;border-radius:7px;background:#f1f6f1;color:#315f55;font-size:10px;font-weight:900;cursor:pointer}.guide-steps{display:grid;gap:12px;margin:28px 0}.guide-steps section{display:grid;grid-template-columns:48px 1fr;align-items:start;gap:14px;margin:0;padding:19px;text-align:left}.guide-steps>section>i{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:#f8d96f;color:#5a4c20;font-style:normal;font-size:20px;font-weight:900}.guide-steps h2{margin:0 0 5px;font-family:serif}.guide-steps p{margin:0;color:#66736f}.privacy-note{padding:19px;border-left:4px solid #4f8578;border-radius:0 13px 13px 0;background:#edf5f0}.privacy-note p{margin:7px 0 0;color:#53645e;line-height:1.8}
button:focus-visible,input:focus-visible{outline:4px solid #79a99d;outline-offset:3px}@media(max-width:760px){.support-actions{grid-template-columns:1fr 1fr 1fr}.map-lessons,.prerequisite-map{grid-template-columns:1fr}.guide-steps section{grid-template-columns:40px 1fr;padding:16px}.guide-steps>section>i{width:38px;height:38px}}
.wrong-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin:12px 0}.wrong-actions button{min-height:44px;border:1px solid #d8c49b;border-radius:10px;background:#fff8e6;color:#6c5824;font-weight:900;cursor:pointer}.rescue{text-align:center}.rescue>b{display:inline-block;margin-bottom:15px;padding:7px 12px;border-radius:99px;background:#fff0dd;color:#a04d2d}.rescue-actions{margin-top:25px}@media(max-width:760px){.wrong-actions{grid-template-columns:1fr}}

.input-assist{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:12px}.input-assist small{color:#7a847f;font-size:11px;font-weight:800}.input-assist button{min-height:38px;padding:7px 10px;border:1px solid #cfded8;border-radius:9px;background:#fff;color:#315f55;font-size:12px;font-weight:900;cursor:pointer}.input-assist button:hover{border-color:#4f8578;background:#edf5f0}@media(max-width:760px){.input-assist{gap:6px}.input-assist small{flex:0 0 100%;text-align:center}.input-assist button{flex:1 1 88px;min-height:42px;padding:8px 6px}}
@media(max-width:760px){aside>label{display:block;margin:0 0 3px;font-size:11px;line-height:1.3;letter-spacing:.12em}aside h2{display:block;margin:0;font-size:16px;line-height:1.4}.answer{gap:10px}.answer strong{font-size:24px;white-space:nowrap}}
.success-feedback{background:#edf5f0;color:#315f55}.primary:disabled,.input-assist button:disabled{cursor:default;opacity:.65}.primary:disabled{transform:none;box-shadow:0 4px 0 #bd5037}

.step-scroll-hint{display:none}
@media(max-width:340px){.step-scroll-hint{display:block;margin:-2px 0 4px;color:#71807a;font-size:10px;font-weight:800;text-align:right}}

/* ===== 2次不等式 Ver.0.1.0（上は Ver.0.2.4 prototype.css ＋ 2次方程式とグラフ Ver.0.1.0 の複製） ===== */
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.math{white-space:normal;overflow-wrap:anywhere}
.frac,.sqrt{white-space:nowrap}
.frac{display:inline-flex;flex-direction:column;align-items:stretch;vertical-align:middle;margin:0 .12em;text-align:center;line-height:1.15}
.frac-num{padding:0 .18em .08em;border-bottom:2px solid currentColor}
.frac-den{padding:.08em .18em 0}
.sqrt{display:inline-flex;align-items:flex-start;white-space:nowrap}
.sqrt-sign{padding-right:.02em}
.sqrt-body{padding:0 .12em;border-top:2px solid currentColor;margin-top:.12em}
.back-top{display:inline-block;margin:-6px 0 18px;color:#4f8578;font-size:13px;font-weight:800}
.course-note{margin:-14px 0 26px;padding:12px 14px;border-radius:12px;background:#f1f6f1;color:#53645e;font-size:13px;line-height:1.8}
.course-note a,blockquote a{color:#315f55;font-weight:800}
.course-clear>a.link{text-align:center}
.problem-section .note{margin:10px 0 0;color:#6f7d78;font-size:12px}
.answer input.mini,.fill-row input.mini{width:74px;height:60px;border:3px solid #5c8e82;border-radius:14px;text-align:center;font-size:26px;font-weight:900;outline:none;background:#fff}
.answer input.mini:disabled,.fill-row input.mini:disabled{background:#edf5f0;color:#315f55}
input[aria-invalid="true"]{border-color:#ef6c4d!important;background:#fff4ef}
.answer input:disabled{background:#edf5f0;color:#315f55}
.pair-answer{gap:10px}
.pair-answer .sep{font-size:30px;font-weight:900}
.radical-answer{gap:12px}
.frac-input{font-size:26px;font-weight:900}
.frac-input .frac-num{display:flex;align-items:center;gap:6px;padding:0 4px 8px;border-bottom-width:3px}
.frac-input .frac-den{display:flex;justify-content:center;padding-top:8px}
.frac-input .sqrt{align-items:center}
.frac-input .sqrt-body{margin-top:0;padding:4px 0 0 2px;border-top-width:3px}
.pm{font-size:24px}
.fill-steps .eq-line{background:none;text-align:center;font-size:22px}
.fill-row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.fill-row span{flex:1 1 150px}
.fill-row input.mini{width:70px;height:48px;font-size:22px}
.part-b{margin-top:26px;padding-top:20px;border-top:1px dashed #b9cfc6}
.part-b h2{margin:0;font-family:"Yu Mincho",serif;font-size:22px;outline:none}
.part-choices{margin:18px 0 0;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.part-choices button{font-size:19px;padding:10px}
.part-choices button.chosen{border-color:#4f8578;background:#edf5f0}
.quiz-choices.long{grid-template-columns:1fr}
.quiz-choices.long button{min-height:64px;padding:10px 14px;font-size:21px}
.quiz-choices button{overflow-wrap:anywhere}
.quiz-choices button:disabled{cursor:default;opacity:.7}
.graph{display:block}
.graph .vertex{fill:#263f3a}
.graph-trio{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:26px 0}
.graph-trio figure{margin:0;padding:10px;border:1px solid #d3e1d8;border-radius:16px;background:#f1f6f1;text-align:center}
.graph-trio figcaption{display:grid;gap:2px;margin-top:8px;font-size:13px;font-weight:800;color:#315f55}
.graph-trio figcaption b{color:#e65d3e;font-family:serif;font-size:18px}
details.why{margin:20px 0;padding:14px 16px;border:1px solid #d3e1d8;border-radius:14px;background:#f8faf6}
details.why summary{cursor:pointer;color:#315f55;font-weight:900}
details.why p{margin:12px 0 0;line-height:2}
.formula-card .frac{font-size:.9em}
.clear .learned .frac,.review .frac{font-size:.95em}
#feedback:focus{outline:none}
@media(max-width:760px){
.graph-trio{grid-template-columns:1fr;max-width:280px;margin-inline:auto}
.problem-section{padding:22px 12px!important}
.part-choices{grid-template-columns:1fr}
.quiz-choices.long button{font-size:19px}
.fill-steps{padding:20px 12px!important}
.fill-steps .eq-line{font-size:19px}
}
@media(max-width:360px){
.answer input.mini{width:58px;height:54px;font-size:22px}
.radical-answer{gap:6px}
.frac-input{font-size:22px}
.frac-input .frac-num{gap:3px}
.pm{font-size:20px}
.answer strong{font-size:20px}
.fill-row input.mini{width:62px}
}

/* 範囲の答え（L5・L8。P2で「すべての実数」「解なし」へ拡張できる構造） */
.dform-answer{gap:8px}
.dform-answer .sep{font-size:30px;font-weight:900}
.range-answer{display:grid;gap:14px;margin-top:16px}
.range-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px}
.range-row[hidden]{display:none}
.range-row input.mini{width:104px;height:58px;padding:0 6px;border:3px solid #5c8e82;border-radius:14px;background:#fff;text-align:center;font-size:26px;font-weight:900;outline:none;box-shadow:none}
.range-row input.mini:disabled{background:#edf5f0;color:#315f55}
.range-var{font-family:"Yu Mincho",serif;font-size:30px;font-weight:900}
.op-show{min-width:34px;text-align:center;font-size:30px;font-weight:900;color:#e65d3e}
.range-row .op-group{flex-basis:100%;order:3;display:flex;justify-content:center;gap:6px}
.op-group button{min-width:48px;height:48px;padding:0;border:2px solid #b9cfc6;border-radius:12px;background:#fff;color:#263f3a;font-size:22px;font-weight:900;cursor:pointer}
.op-group button.on{border-color:#263f3a;background:#263f3a;color:#fff}
.join-group{display:flex;flex-wrap:wrap;justify-content:center;gap:6px}
.join-group button{min-height:44px;padding:6px 14px;border:1.5px solid #b9cfc6;border-radius:99px;background:#fff;color:#315f55;font-size:14px;font-weight:800;cursor:pointer}
.join-group button.on{border-color:#4f8578;background:#e3efe8}
.range-preview{margin:0!important;padding:10px!important;border-radius:12px;background:#fff!important;text-align:center;font-size:15px}
.range-preview b{font-size:19px;white-space:nowrap}
@media(max-width:360px){
.op-group button{min-width:40px;height:46px;font-size:20px}
.range-row .op-group{gap:4px}
.join-group button{padding:6px 10px;font-size:13px}
}

/* ===== Ver.0.1.0 アクセシビリティ調整（このコースだけに適用。Ver.0.2.4 のファイルは変更しない） ===== */
/* 見出しの順序：クリア画面の「今日わかったこと」を h2 に（見た目は従来の h3 と同じ） */
.clear .learned{margin:1em 0;font-size:1.17em;font-weight:bold}
/* 学びの地図のレッスン番号ボタン：縦横32px以上 */
.prerequisite-map section>div{gap:6px}
.prerequisite-map section>div button{min-width:36px;min-height:34px;padding:6px 8px;font-size:12px;line-height:1.2}
/* 文字色のコントラスト：WCAG 2 AA（4.5:1）を満たす色へ */
#lesson-number,#card>label,.clear>label,.course-clear>label,.rescue>label,.challenge-result>label,.practice-feedback label,.foundation-head>label,.map-level>label,.link,.back-top,.review small,.clear section small,.formula-card>small,section>small{color:#2f5f53}
#percent,.step-scroll-hint,.input-assist>small,.choices small,.note,.problem-section .note,.lesson-grid small,.foundation-head p,.map-arrow,.candidate-row small,aside li i,.glossary-grid p,.guide-steps p{color:#55625d}
.base-jump small,.foundation-grid small,.prerequisite-map small{color:#6a5a33}
.lesson-grid i,.graph-trio figcaption b{color:#b33f22}
.primary{background:#c24a2e;box-shadow:0 7px 0 #8f321d}
.primary:active{box-shadow:0 3px 0 #8f321d}
.primary:disabled{box-shadow:0 4px 0 #8f321d}

/* ===== 2次不等式 Ver.0.1.0 で追加 ===== */
.q-eq{background:none!important;text-align:center;font-size:22px}
.graph-box{margin:16px 0;padding:10px;border:1px solid #d3e1d8;border-radius:16px;background:#f8faf6}
.graph-note{margin:6px 0 0!important;padding:0!important;background:none!important;text-align:center;font-size:12px;color:#55625d}
.graph .hl{stroke:#e65d3e;stroke-width:6}
.graph .hl-label{font-size:12px;font-weight:800;fill:#b33f22}
.graph-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.numberline{display:block;width:100%;margin:6px auto 0}
.numberline .nl-axis line{stroke:#7a8a84;stroke-width:1.5}
.numberline text{font-size:10px;fill:#55625d;text-anchor:middle;font-family:inherit}
.numberline .nl-bar{stroke:#e65d3e;stroke-width:7;stroke-linecap:butt}
.numberline .nl-dot{stroke:#b33f22;stroke-width:3}
.numberline .nl-dot.closed{fill:#b33f22}
.numberline .nl-dot.open{fill:#fff}
.numberline .nl-note{font-size:12px;fill:#55625d}
.nl-demo{margin:16px 0;padding:12px;border-radius:14px;background:#f1f6f1}
.nl-demo p{margin:0 0 4px!important;background:none!important;font-size:13px}
.done-steps{list-style:none;margin:14px 0;padding:0;display:grid;gap:6px}
.done-steps li{display:grid;grid-template-columns:20px 1fr auto;gap:8px;align-items:center;padding:8px 10px;border-radius:10px;background:#edf5f0;font-size:13px;color:#2f4a44}
.done-steps b{color:#3a7a63}
.done-steps strong{font-size:16px}
.step-now h2{margin:18px 0 10px;font-family:"Yu Mincho",serif;font-size:21px;outline:none}
.step-choices{margin:10px 0 0}
.step-choices button.chosen{border-color:#4f8578;background:#edf5f0}
.form-group{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.form-group button{min-height:46px;padding:8px 10px;border:1.5px solid #b9cfc6;border-radius:12px;background:#fff;color:#315f55;font-size:13px;font-weight:800;cursor:pointer}
.form-group button.on{border-color:#4f8578;background:#e3efe8}
.form-note{margin:12px 0 0!important;background:none!important;text-align:center;font-size:13px;color:#55625d}
#range-body{margin-top:12px}
.op-rows{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px}
.op-rows>div{text-align:center}
.op-rows small{display:block;margin-bottom:4px;font-size:11px;color:#55625d}
.op-rows .op-group{justify-content:center}
.chips{margin-top:12px;text-align:center}
.chips small{display:block;margin-bottom:6px;font-size:11px;color:#55625d}
.chip{min-height:40px;margin:0 4px 4px 0;padding:6px 12px;border:2px dashed #5c8e82;border-radius:12px;background:#fff;font-size:18px;font-weight:900;color:#263f3a;cursor:pointer}
.case-table{display:grid;gap:10px;margin:18px 0}
.case-table>div{padding:10px;border:1px solid #d3e1d8;border-radius:14px;background:#f8faf6;text-align:center}
.case-table b{display:block;font-family:serif;font-size:19px}
.case-table span{display:block;margin:4px 0;font-size:17px;font-weight:800;color:#b33f22}
.sum-table{display:grid;gap:4px;margin:18px 0;font-size:12px}
.sum-table>div{display:grid;grid-template-columns:1.1fr 1fr 1fr 1fr 1fr;gap:4px}
.sum-table span{padding:8px 4px;border-radius:8px;background:#f1f6f1;text-align:center}
.sum-table .head span,.sum-table [role=rowheader]{background:#263f3a;color:#fff;font-weight:800}
@media(max-width:760px){
.graph-pair{grid-template-columns:1fr}
.q-eq{font-size:19px}
.sum-table{font-size:11px}
}
@media(max-width:360px){
.form-group{grid-template-columns:1fr}
.op-rows{grid-template-columns:1fr}
.chip{font-size:16px;padding:6px 8px}
}