:root{--navy:#10235b;--ink:#172143;--cream:#fffaf0;--paper:#fffdf8;--coral:#e84c68;--teal:#168d88;--purple:#7f67b4;--line:#deddd4;--muted:#687086}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream);color:var(--ink);font-family:"Hiragino Sans","Yu Gothic",sans-serif;line-height:1.75}button,a{font:inherit}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,250,240,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.header-inner{width:min(1120px,90vw);height:68px;margin:auto;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;color:var(--navy);font-size:12px;font-weight:900;letter-spacing:.08em;text-decoration:none}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--coral);color:#fff;font-size:18px}.header-back{color:var(--muted);font-size:12px;font-weight:800;text-decoration:none}.eyebrow{margin:0;color:var(--coral);font-size:11px;font-weight:900;letter-spacing:.18em}.intro{width:min(1120px,90vw);margin:auto;padding:66px 0 72px}.intro-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:60px;align-items:center}.intro h1{margin:12px 0 20px;color:var(--navy);font-size:clamp(40px,6vw,68px);line-height:1.16;letter-spacing:-.04em}.intro h1 em{color:var(--coral);font-style:normal}.intro-lead{max-width:650px;margin:0;color:var(--muted);font-size:16px}.intro-meta{display:flex;gap:9px;flex-wrap:wrap;margin:22px 0}.intro-meta span{padding:5px 11px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--navy);font-size:11px;font-weight:900}.privacy-note{display:grid;grid-template-columns:38px 1fr;gap:13px;max-width:650px;padding:17px 19px;border-radius:18px;background:#edf8f6;color:#50636e;font-size:12px}.privacy-note svg{width:32px;fill:none;stroke:var(--teal);stroke-width:2}.privacy-note p{margin:0}.privacy-note strong{display:block;color:var(--navy);font-size:13px}.intro-actions,.finish-actions{display:flex;gap:11px;flex-wrap:wrap;margin-top:25px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:11px 22px;border:0;border-radius:999px;font-size:13px;font-weight:900;text-decoration:none;cursor:pointer}.button.primary{background:var(--navy);color:#fff;box-shadow:0 10px 24px #10235b22}.button.secondary{background:#fff;border:1px solid var(--line);color:var(--navy)}.button.quiet{background:transparent;color:var(--muted)}.button:disabled{opacity:.38;cursor:not-allowed}.intro-visual{position:relative;min-height:380px;display:grid;place-items:center;border-radius:36px;background:linear-gradient(145deg,#edf8f6,#fff0f3);overflow:hidden}.intro-visual svg{position:relative;width:min(92%,420px);z-index:1}.visual-orbit{position:absolute;border-radius:50%}.orbit-one{width:170px;height:170px;right:-45px;top:-35px;background:#79d6d0}.orbit-two{width:120px;height:120px;left:-25px;bottom:-25px;background:#ffcf70}.chapter-preview{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-top:48px}.chapter-preview span{padding:13px 10px;border-radius:13px;background:#fff;border:1px solid var(--line);color:var(--muted);font-size:10px;font-weight:800;text-align:center}
.learning{min-height:calc(100vh - 68px);padding:38px 0 70px}.learning-shell{width:min(820px,90vw);margin:auto}.learning-top,.chapter-line{display:flex;justify-content:space-between;align-items:center;gap:15px;color:var(--muted);font-size:12px;font-weight:800}.text-button{padding:5px 0;border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:800;cursor:pointer}.progress{height:7px;margin:12px 0 18px;border-radius:999px;background:#e9e7de;overflow:hidden}.progress span{display:block;width:0;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--coral),#f28b87);transition:width .3s ease}.chapter-line strong{color:var(--navy)}.step-card{margin-top:20px;padding:38px 42px;border:1px solid var(--line);border-radius:28px;background:#fff;box-shadow:0 18px 50px #10235b0d}.step-icon{display:grid;place-items:center;width:58px;height:58px;border-radius:17px;background:#edf8f6;color:var(--teal);font-size:28px;font-weight:900}.step-kicker{margin:18px 0 5px;color:var(--coral);font-size:11px;font-weight:900;letter-spacing:.12em}.step-card h2{margin:0;color:var(--navy);font-size:clamp(25px,4vw,36px);line-height:1.45}.step-body{margin:13px 0 22px;color:var(--muted);font-size:14px;white-space:pre-line}.options{display:grid;gap:10px}.option{width:100%;padding:15px 18px;border:1px solid var(--line);border-radius:15px;background:#fff;color:var(--ink);font-size:14px;font-weight:700;text-align:left;cursor:pointer;transition:.15s}.option:hover{border-color:#80beb9;background:#f7fcfb}.option[aria-pressed="true"]{border-color:var(--teal);background:#edf8f6;color:#0d625f;box-shadow:0 0 0 2px #168d8820}.option.info{position:relative;padding-right:50px}.option.info::after{content:"＋";position:absolute;right:18px;color:var(--teal);font-size:20px}.option.info[aria-expanded="true"]::after{content:"−"}.info-detail{margin:-2px 0 4px;padding:15px 18px;border-radius:13px;background:#f6faf9;color:#526273;font-size:13px}.feedback{margin-top:18px;padding:17px 19px;border-radius:15px;background:#fff3f5;color:#653944;font-size:13px}.feedback strong{display:block;margin-bottom:3px;color:var(--navy);font-size:14px}.step-actions{display:flex;justify-content:space-between;gap:12px;margin-top:28px}.step-actions .button{min-width:110px}
.finish{padding:60px 0 80px}.finish-card{width:min(820px,90vw);margin:auto;padding:42px;border:1px solid var(--line);border-radius:30px;background:#fff;text-align:center}.finish-mark{display:grid;place-items:center;width:68px;height:68px;margin:0 auto 18px;border-radius:50%;background:#edf8f6;color:var(--teal);font-size:33px;font-weight:900}.finish h2{margin:7px 0;color:var(--navy);font-size:38px}.finish>p{color:var(--muted)}.thought-summary{margin-top:28px;padding:24px;border-radius:20px;background:#fffaf0;text-align:left}.thought-summary h3{margin:0;color:var(--navy)}.thought-summary p{margin:5px 0 15px;color:var(--muted);font-size:12px}.thought-summary ul{margin:0;padding-left:20px;color:var(--ink);font-size:13px}.finish-actions{justify-content:center}footer{display:flex;justify-content:space-between;gap:20px;padding:28px max(5vw,20px);border-top:1px solid var(--line);background:var(--paper);color:var(--muted);font-size:11px;font-weight:800}footer a{color:inherit}
@media(max-width:820px){.intro{padding-top:36px}.intro-grid{grid-template-columns:1fr;gap:28px}.intro-visual{order:-1;min-height:230px}.intro-visual svg{width:230px}.chapter-preview{grid-template-columns:repeat(2,1fr);margin-top:30px}.step-card{padding:26px 22px}.learning{padding-top:24px}.finish-card{padding:30px 22px}.intro-actions,.finish-actions{display:grid}.button{width:100%}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* 基礎編目次：章カード内の図解は、このアイコン領域へ追加・差し替えできます。 */
.toc-heading{display:grid;grid-template-columns:minmax(0,.78fr) minmax(340px,1.22fr);gap:54px;align-items:end;margin-bottom:34px}.toc-heading h1{margin-bottom:0}.toc-introduction{padding-bottom:8px}.toc-introduction>p{max-width:650px;margin:0;color:var(--muted);font-size:15px}.chapter-toc{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.chapter-card{display:grid;grid-template-columns:62px 1fr;grid-template-rows:auto 1fr auto;gap:12px 16px;min-height:250px;padding:23px;border:1px solid var(--line);border-radius:24px;background:#fff;color:var(--ink);text-decoration:none;box-shadow:0 12px 30px #10235b0a;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}.chapter-card:hover,.chapter-card:focus-visible{transform:translateY(-3px);border-color:#80beb9;box-shadow:0 17px 36px #10235b16;outline:none}.chapter-card-number{grid-column:1/-1;color:var(--coral);font-size:11px;font-weight:900;letter-spacing:.12em}.chapter-card-icon{display:grid;place-items:center;width:62px;height:62px;border-radius:19px;background:#edf8f6;color:var(--teal);font-size:20px;font-weight:900}.chapter-card:nth-child(2n) .chapter-card-icon{background:#fff0f3;color:var(--coral)}.chapter-card:nth-child(3n) .chapter-card-icon{background:#f0edfa;color:var(--purple)}.chapter-card-copy{align-self:center}.chapter-card-copy strong{display:block;color:var(--navy);font-size:20px;line-height:1.4}.chapter-card-copy small{display:block;margin-top:7px;color:var(--muted);font-size:12px;line-height:1.65}.chapter-card-link{grid-column:1/-1;align-self:end;padding-top:14px;border-top:1px solid #ece9e1;color:var(--teal);font-size:12px;font-weight:900}.toc-privacy{max-width:none;margin-top:26px}.toc-actions{display:flex;gap:11px;flex-wrap:wrap;margin-top:18px}
@media(max-width:900px){.toc-heading{grid-template-columns:1fr;gap:10px}.chapter-toc{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.intro{padding-top:32px}.toc-heading h1{font-size:39px}.chapter-toc{grid-template-columns:1fr}.chapter-card{min-height:0;grid-template-columns:54px 1fr;padding:19px}.chapter-card-icon{width:54px;height:54px;border-radius:16px}.chapter-card-copy strong{font-size:18px}.toc-actions{display:grid}.toc-actions .button{width:100%}}

/* 学習中の章ナビゲーションと回答後の説明 */
.learning-shell{width:min(1120px,90vw)}.learning-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:28px;align-items:start;margin-top:18px}.learning-main{min-width:0}.learning-chapters{position:sticky;top:94px;padding:18px;border:1px solid var(--line);border-radius:22px;background:#fff}.learning-chapters>p{margin:0 0 10px;color:var(--coral);font-size:10px;font-weight:900;letter-spacing:.14em}.learning-chapters ol{display:grid;gap:6px;margin:0;padding:0;list-style:none}.learning-chapters button{display:grid;grid-template-columns:28px 1fr;gap:9px;align-items:center;width:100%;padding:10px;border:0;border-radius:12px;background:transparent;color:var(--muted);font-size:11px;font-weight:800;text-align:left;cursor:pointer}.learning-chapters button span{display:grid;place-items:center;width:28px;height:28px;border-radius:9px;background:#f2f1eb;color:var(--navy);font-size:10px}.learning-chapters button:hover{background:#f7fbfa;color:var(--navy)}.learning-chapters button[aria-current="step"]{background:#fff0f3;color:var(--navy);box-shadow:inset 3px 0 0 var(--coral)}.learning-chapters button[aria-current="step"] span{background:var(--coral);color:#fff}.learning-layout .step-card{margin-top:12px}.feedback{position:relative;margin-top:20px;padding:19px 20px 19px 24px;border:1px solid #f3cbd3;border-left:5px solid var(--coral);background:#fff6f7}.feedback strong{color:var(--coral);letter-spacing:.08em}
@media(max-width:820px){.learning-layout{grid-template-columns:1fr;gap:16px}.learning-chapters{position:static;padding:13px;overflow-x:auto}.learning-chapters>p{margin-left:4px}.learning-chapters ol{display:flex;width:max-content}.learning-chapters li{width:150px}.learning-chapters button{height:100%}.learning-main{width:100%}}
@media(max-width:480px){.learning-shell{width:min(92vw,1120px)}.learning-chapters li{width:134px}.learning-chapters button{grid-template-columns:25px 1fr;padding:8px;font-size:10px}.learning-chapters button span{width:25px;height:25px}.feedback{padding:16px 16px 16px 18px}}

/* 回答後に表示する共通図解 */
.diagram-area{display:grid;gap:18px;margin-top:18px}.diagram{padding:22px;border:1px solid #d9e6e2;border-radius:20px;background:#fffdf8}.diagram-title{margin:0 0 17px;color:var(--navy);font-size:18px;line-height:1.5}.diagram-body{color:var(--ink)}.diagram-node{display:grid;place-items:center;min-height:58px;padding:10px 12px;border:1px solid #cfe3df;border-radius:14px;background:#edf8f6;color:var(--navy);font-size:12px;font-weight:800;line-height:1.55;text-align:center}.diagram-arrow{display:grid;place-items:center;flex:0 0 20px;color:var(--teal);font-size:18px;font-weight:900}.diagram-sequence{display:flex;align-items:stretch;justify-content:center}.diagram-sequence .diagram-node{flex:1}.diagram-compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.diagram-compare .diagram-node:last-child:nth-child(odd){grid-column:1/-1}.diagram-start{width:min(220px,100%);margin:0 auto 18px;padding:12px;border-radius:999px;background:var(--navy);color:#fff;font-size:13px;font-weight:900;text-align:center}.diagram-branches{position:relative;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;padding-top:18px}.diagram-branches:before{content:"";position:absolute;top:0;left:25%;right:25%;height:1px;background:#9fcac5}.diagram-branch{display:grid;align-content:start;gap:8px;padding:15px;border:1px solid var(--line);border-radius:16px;background:#fff}.diagram-branch>strong{color:var(--coral);font-size:12px;text-align:center}.diagram-branch.is-main{border:2px solid var(--teal);background:#f5fbfa}.diagram-branch.is-main>strong{color:var(--teal);font-size:14px}.diagram-branch .diagram-arrow{height:20px}.diagram-highlight{display:block;margin-top:13px;padding:12px;border-radius:13px;background:#edf8f6;color:var(--teal);font-size:13px;text-align:center}.diagram-dose-row{display:grid;grid-template-columns:1fr auto minmax(90px,.45fr);gap:12px;align-items:center;margin-top:9px;padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff}.diagram-dose-row:first-child{margin-top:0}.diagram-dose-row span{font-size:12px;font-weight:800}.diagram-dose-row b{color:var(--teal)}.diagram-dose-row strong{padding:8px;border-radius:999px;background:#edf8f6;color:var(--teal);font-size:13px;text-align:center}.diagram-checklist{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin:0;padding:0;list-style:none}.diagram-checklist li{position:relative;padding:12px 12px 12px 38px;border-radius:13px;background:#f6faf9;color:var(--navy);font-size:12px;font-weight:800}.diagram-checklist li:before{content:"✓";position:absolute;left:13px;color:var(--teal);font-weight:900}.diagram-prevention{display:flex;align-items:center;width:min(430px,100%);margin:18px auto 0;padding:13px;border:2px solid var(--teal);border-radius:16px;background:#f5fbfa}.diagram-prevention .diagram-node{flex:1;background:#fff}.diagram-date,.diagram-note{margin:13px 0 0;color:var(--muted);font-size:11px}.diagram-date{font-weight:900;text-align:right}.diagram-point{margin:17px 0 0;padding:15px 17px;border-radius:15px;background:#fff0f3;color:var(--navy);font-size:13px;font-weight:800}.diagram-point strong{display:block;margin-bottom:3px;color:var(--coral);font-size:10px;letter-spacing:.1em}
@media(max-width:620px){.diagram{padding:18px 15px}.diagram-title{font-size:16px}.diagram-sequence,.diagram-prevention{display:grid;grid-template-columns:1fr}.diagram-sequence .diagram-arrow,.diagram-prevention .diagram-arrow{height:23px;transform:rotate(90deg)}.diagram-flow .diagram-node{min-height:48px}.diagram-compare,.diagram-branches,.diagram-checklist{grid-template-columns:1fr}.diagram-compare .diagram-node:last-child:nth-child(odd){grid-column:auto}.diagram-branches{gap:12px;padding-top:0}.diagram-branches:before{display:none}.diagram-dose-row{grid-template-columns:1fr auto}.diagram-dose-row strong{grid-column:1/-1}.diagram-dose-row b{transform:rotate(90deg)}.diagram-node{min-height:52px;font-size:12px}.diagram-point{font-size:12px}}

/* 6章をひと続きの学習順序として見せる目次 */
.learning-route{display:flex;align-items:center;justify-content:center;gap:9px;margin:0 0 22px;padding:13px 16px;border:1px solid var(--line);border-radius:16px;background:#fff;color:var(--navy);font-size:10px;font-weight:900}.learning-route i{color:var(--coral);font-style:normal}.chapter-toc{grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.chapter-card{position:relative;grid-template-columns:1fr;grid-template-rows:auto 100px auto auto;gap:13px;min-height:310px;padding:22px 24px;overflow:hidden}.chapter-card:before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:linear-gradient(var(--coral),var(--teal))}.chapter-card-number{font-size:10px}.chapter-card-preview{display:flex;align-items:center;justify-content:center;gap:8px;min-height:100px;padding:14px;border-radius:17px;background:#f6faf9;color:var(--navy);font-size:10px;font-weight:900}.chapter-card-preview i,.chapter-card-preview b{display:grid;place-items:center;min-height:34px;padding:7px 10px;border:1px solid #cfe3df;border-radius:11px;background:#fff;font-style:normal}.preview-virus i{width:62px;height:62px;border-radius:50%;background:var(--teal);color:#fff;font-size:15px}.preview-virus b{color:var(--teal)}.preview-branch{display:grid}.preview-branch>i{justify-self:center;background:var(--navy);color:#fff}.preview-branch>span{position:relative;display:grid;grid-template-columns:repeat(2,1fr);gap:12px;width:100%;padding-top:8px}.preview-branch>span:before{content:"";position:absolute;top:0;left:25%;right:25%;height:1px;background:var(--teal)}.preview-branch b:first-child{border:2px solid var(--teal);color:var(--teal)}.preview-vaccine b{min-height:0;padding:0;border:0;background:transparent;color:var(--coral);font-size:16px}.preview-vaccine i:last-child{background:#edf8f6;color:var(--teal)}.preview-dose,.preview-roles{display:grid;grid-template-columns:repeat(2,1fr)}.preview-dose span,.preview-roles span{display:grid;gap:5px;text-align:center}.preview-dose b,.preview-dose i,.preview-roles b,.preview-roles i{min-height:0;font-style:normal}.preview-dose i{background:#edf8f6;color:var(--teal)}.preview-roles span:first-child b{background:#edf8f6;color:var(--teal)}.preview-roles span:last-child b{background:#fff0f3;color:var(--coral)}.preview-thinking{display:grid;grid-template-columns:repeat(4,1fr)}.preview-thinking i{position:relative;min-height:45px;padding:6px}.chapter-card-copy{display:block}.chapter-card-copy strong{font-size:22px}.chapter-card-copy small{font-size:13px}.chapter-card-link{padding-top:11px}
@media(max-width:760px){.learning-route{justify-content:flex-start;overflow-x:auto;white-space:nowrap}.chapter-toc{grid-template-columns:1fr}.chapter-card{grid-template-rows:auto 96px auto auto;min-height:295px}.chapter-card-preview{min-height:96px}}
@media(max-width:400px){.chapter-card{padding:19px 18px}.chapter-card-copy strong{font-size:19px}.chapter-card-copy small{font-size:12px}.chapter-card-preview{padding:10px;gap:5px}.chapter-card-preview i,.chapter-card-preview b{padding:6px;font-size:9px}.preview-thinking{grid-template-columns:repeat(2,1fr)}}

/* 承認済み目次：スマホでは文字と図を上下に分離 */
.chapter-card{grid-template-columns:58px minmax(0,1fr) 168px;grid-template-rows:auto 1fr auto;min-height:190px}.chapter-card-number{grid-column:1;grid-row:1/4;align-self:start;font-size:25px;letter-spacing:-.03em}.chapter-card-copy{grid-column:2;grid-row:1/3}.chapter-card-preview{grid-column:3;grid-row:1/4;min-height:92px}.chapter-card-link{grid-column:2;grid-row:3}
@media(max-width:760px){.chapter-card{grid-template-columns:46px minmax(0,1fr);grid-template-rows:auto auto 82px auto;gap:4px 10px;min-height:205px;padding:13px 16px}.chapter-card-number{grid-column:1;grid-row:1/3;align-self:start;font-size:23px}.chapter-card-copy{grid-column:2;grid-row:1/3;align-self:start}.chapter-card-copy strong{font-size:17px}.chapter-card-copy small{margin-top:3px;font-size:11px}.chapter-card-preview{grid-column:1/-1;grid-row:3;min-height:78px;padding:7px 12px}.chapter-card-link{grid-column:1/-1;grid-row:4;padding-top:7px}.preview-thinking{grid-template-columns:repeat(4,1fr)}}
@media(max-width:400px){.chapter-card{min-height:205px;padding:13px}.chapter-card-preview{padding:6px 8px}.chapter-card-preview i,.chapter-card-preview b{padding:4px;font-size:8px}}

/* 章番号はサイト全体の柔らかい色調に合わせて控えめに表示 */
.chapter-card:before{display:none}.chapter-card-number{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:#edf8f6;color:var(--teal);font-size:15px;letter-spacing:0}.chapter-card{border-color:var(--line);box-shadow:0 8px 22px #10235b08}
@media(max-width:760px){.chapter-card-number{width:34px;height:34px;font-size:14px}}
.chapter-card:before{background:var(--teal)}

/* 問いは暖色、回答・解説は寒色に分けて学習状態を明確にする */
.step-card{border-top:4px solid #f2b9c4}.step-icon{background:#fff0f3;color:var(--coral)}.step-kicker{color:var(--coral)}.options{padding:16px;border-radius:18px;background:#fffaf7}.option{background:#fff}.feedback{border-color:#b9dcd7;border-left-color:var(--teal);background:#edf8f6;color:#315f5d}.feedback strong{color:var(--teal)}.diagram-area{padding:16px;border-radius:20px;background:#edf8f6}.diagram{border-color:#c9e1dd;background:#fff}.diagram-title{color:var(--teal)}
@media(max-width:620px){.options{padding:10px}.diagram-area{padding:10px}}

/* 予想・選択する画面と、説明を開いて学ぶ画面をステップ単位で区別 */
.step-card.is-question{border-top-color:#f2b9c4}.step-card.is-question .step-icon{background:#fff0f3;color:var(--coral)}.step-card.is-question .step-kicker{color:var(--coral)}.step-card.is-explanation{border-top-color:#9fcfca}.step-card.is-explanation .step-icon{background:#edf8f6;color:var(--teal)}.step-card.is-explanation .step-kicker{color:var(--teal)}.step-card.is-explanation .options{background:#f5fbfa}.step-card.is-explanation .option.info{border-color:#cfe3df}

/* 各章の提供図解 */
.diagram--image{padding:0;overflow:hidden;background:#fff}.diagram--image img{display:block;width:100%;height:auto}

/* 目次カード：番号をタイトルの上へ置き、本文を左へ寄せる */
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