@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;600;700;800&display=swap');
:root{--ink:#183e39;--muted:#61716b;--green:#143f3a;--lime:#d8edb0;--paper:#f8f8f2;--line:#dce2d8;--white:#fff;--orange:#d88856}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;color:var(--ink);background:var(--paper);font-family:'Noto Sans JP',sans-serif;line-height:1.85}a{color:inherit;text-underline-offset:4px}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #b47035;outline-offset:5px}header{min-height:96px;padding:20px 5%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:var(--paper);gap:25px}header 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a{font-size:11px}.content-page{max-width:780px;margin:auto}.content-page h2{font-size:20px;margin-top:32px}.content-page p,.content-page li{font-size:14px}.sources a{overflow-wrap:anywhere}.storage-warning{padding:12px;background:#fff0dd;font-size:12px;border-radius:8px;margin:15px 0}.empty{font-size:14px;padding:20px;color:var(--muted)}.loading{padding:50px}.review-box{background:#e9efdf;border-radius:10px;padding:22px;margin:20px 0}#notice{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--green);color:white;border-radius:8px;font-size:12px;max-width:90%;z-index:20}#notice:not(:empty){padding:12px 20px}.print-button{font-size:11px;background:transparent;border:1px solid var(--line);border-radius:6px;padding:7px 12px;color:var(--muted)}
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@media(max-width:700px){header{padding:16px 20px;flex-wrap:wrap;gap:13px;min-height:90px}header nav{gap:20px;font-size:11px;width:100%;justify-content:space-between}.brand{font-size:17px}main{padding:0 20px 50px}.hero{grid-template-columns:1fr;padding:35px 0;gap:27px}.hero h1{font-size:35px;margin-top:16px}.hero-art{min-height:290px;border-radius:95px 95px 20px 20px}.hero-art:after{width:330px;height:330px}.chip-one{left:15px;top:35px}.chip-two{right:8px;top:145px}.chip-three{bottom:20px;left:20px}.hero .intro{font-size:13px}.progress-panel{grid-template-columns:1fr auto;padding:20px;gap:15px;margin-bottom:35px}.progress-meter{grid-row:2;grid-column:1/-1}.progress-count{grid-column:2;grid-row:1}.section-heading{align-items:start;flex-direction:column;gap:5px}.section-heading h2{font-size:23px}.cards{gap:12px}.lesson-card{padding:15px;min-height:230px}.lesson-card h3{font-size:14px}.lesson-card p{font-size:10px}.card-bottom{font-size:9px}.card-top{font-size:9px}.stage-title{font-size:12px;gap:10px}.guide-strip{padding:24px;align-items:start;flex-direction:column;gap:18px}.lesson-layout{display:block}.lesson-sidebar{display:none}.lesson-head h1{font-size:27px}.lesson-head p{font-size:13px}.article-section h2{font-size:20px}.article-section p{font-size:14px}.diagram{padding:18px}.diagram ol{flex-direction:column;gap:21px}.diagram li{padding:12px}.diagram li:not(:last-child):after{content:'↓';right:50%;bottom:-23px;transform:translateX(50%)}.question{padding:17px 13px}.question legend{font-size:13px}.question label{font-size:12px}.lesson-navigation{flex-wrap:wrap}.glossary{grid-template-columns:1fr}.page-head h1{font-size:27px}.stats{gap:20px}.hero-actions{gap:16px}}
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main:focus{outline:none}
.learning-table{margin:25px 0}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px;background:white}table{border-collapse:collapse;width:100%;font-size:12px;text-align:left}th,td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}thead{background:#e9efdf}tbody th{font-weight:500;width:30%}.table-note{font-size:11px!important;color:var(--muted)}.checklist-panel{background:#edf3e6;padding:23px;border-radius:10px}.checklist-item{display:flex;align-items:flex-start;gap:12px;font-size:13px;padding:12px 0;border-top:1px solid #d5e0cd;cursor:pointer}.checklist-item input{margin-top:6px;accent-color:var(--green);width:17px;height:17px;flex-shrink:0}.checklist-panel button{margin-top:18px}
.diagram ul{list-style:none;display:flex;align-items:stretch;margin:0;padding:0;gap:20px}.diagram.concepts li:not(:last-child):after{display:none}.diagram h3{font-size:15px;margin:0 0 18px}.sync-demo{padding:24px;border:1px solid var(--line);border-radius:10px;background:#eef3e6}.sync-controls{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}.sync-controls button{border:1px solid #a7b99e;color:var(--ink);background:white;padding:10px 13px;border-radius:7px;font-size:12px}.sync-controls button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}.sync-records{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:20px 0}.sync-record{background:white;border:1px solid var(--line);border-radius:8px;padding:15px}.sync-record h3{font-size:12px;margin:0 0 9px;color:var(--muted)}.sync-record p{font-size:13px;font-weight:600;margin:0;overflow-wrap:anywhere}
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@media(max-width:700px){header nav{gap:8px}.lesson-shortcuts{gap:5px}.lesson-shortcuts button{font-size:10px;padding:7px 8px}.review-entry{flex-direction:column;align-items:start;padding:22px}.lesson-summary,.security-connection{padding:20px}.question input[type=checkbox]{flex-shrink:0}}
@media print{.lesson-shortcuts,.lesson-toc{display:none!important}}
.hero-scene{margin:0;align-self:center;background:white;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:0 14px 35px #143f3a08}.hero-scene img{display:block;width:100%;height:auto}.hero-scene figcaption{padding:18px 22px;font-size:12px;font-weight:600}.hero-scene small{display:block;font-size:9px;font-weight:400;color:var(--muted);margin-top:5px}.lesson-opening{display:grid;grid-template-columns:1fr 1fr;gap:24px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:12px;margin:25px 0 35px;align-items:start}.scene-picture{margin:0}.scene-picture img{width:100%;height:auto;display:block;border-radius:8px}.scene-picture figcaption{font-size:9px;color:var(--muted);margin-top:7px}.scene-tag{display:inline-block;font-size:10px;color:#476742;background:#edf3e6;padding:3px 9px;border-radius:5px}.scene-story h2{font-size:19px;line-height:1.7;margin:10px 0}.scene-story p{font-size:12px;line-height:2;margin:0}.look-for{border-top:1px solid var(--line);margin-top:14px;padding-top:12px;font-size:11px}.look-for ul{padding-left:18px;margin:5px 0}.look-for li{margin:5px 0}.analogy{margin:25px 0}.analogy-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.analogy-card{padding:18px;background:#fff;border:1px solid var(--line);border-radius:9px;display:flex;flex-direction:column;align-items:start}.analogy-eyebrow{font-size:9px;letter-spacing:.08em;color:var(--muted)}.analogy-card b{font-size:14px;line-height:1.7;margin-top:5px}.analogy-bridge{display:block;color:#6f8c62;margin:6px 0}.analogy-technical{font-size:11px;font-weight:700;color:#37582f;background:#eaf1df;padding:4px 8px;border-radius:4px}.analogy-card p{font-size:12px;margin:10px 0 0;line-height:1.9}.analogy-limit{font-size:11px!important;color:var(--muted);margin-top:12px!important}.learning-map{margin:28px 0 35px;background:#edf3e6;border:1px solid #cfddc5;padding:22px;border-radius:12px}.learning-map h3{font-size:17px;margin:0 0 8px}.map-instruction{font-size:11px!important;color:var(--muted);margin:0 0 20px!important}.map-nodes{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:18px}.map-node{position:relative;color:var(--ink);border:1px solid #b9cbb0;background:white;border-radius:9px;padding:15px 10px;display:flex;flex-direction:column;align-items:center;text-align:center;min-width:0}.map-node[aria-pressed=true]{border:2px solid #426f50;background:#fcfef8;box-shadow:0 0 0 2px #cbdcbf}.map-icon{display:grid;place-items:center;width:48px;height:48px;background:#e3edd6;border-radius:13px;margin-bottom:10px}.map-icon svg{width:30px;height:30px}.map-node-copy b{display:block;font-size:13px;margin-bottom:5px}.map-node-copy>span{display:block;font-size:10px;color:var(--muted)}.map-step-number{position:absolute;left:8px;top:5px;font-size:9px;color:#52774a}.map-flow .map-node:not(:last-child):after{content:'→';position:absolute;right:-16px;top:50%;font-size:14px;color:#4c7145}.map-layers .map-nodes{grid-template-columns:1fr;gap:9px}.map-layers .map-node{flex-direction:row;text-align:left;gap:15px;padding:12px 16px}.map-layers .map-icon{margin:0;width:40px;height:40px;flex-shrink:0}.map-detail{margin-top:20px;background:white;border-radius:8px;border-left:4px solid #6e955a;padding:17px 20px;min-height:145px}.map-detail-label{font-size:10px;color:#597c4b}.map-detail h4{margin:5px 0 8px;font-size:16px}.map-detail p{font-size:13px;line-height:2;margin:0}.learning-map figcaption{font-size:10px;color:var(--muted);margin-top:15px}.inline-field-example{border-left:3px solid #d6a66b;background:#fff8ed;padding:15px 18px;margin:17px 0 25px;border-radius:0 8px 8px 0}.inline-field-example>b{font-size:11px;color:#8f6938}.inline-field-example p{font-size:13px;margin:7px 0 0}.field-cases{margin-top:22px}.field-cases h3{font-size:16px}.field-case{border:1px solid var(--line);background:white;border-radius:9px;padding:16px 18px;margin:12px 0}.field-case summary{cursor:pointer}.field-case summary b{font-size:14px;display:inline;margin-left:10px}.field-case>p{margin-top:18px}.case-point{padding:14px 17px;background:#edf3e6;border-radius:7px}.case-point>b{font-size:11px}.case-point p{font-size:13px;margin:6px 0 0}.detailed-heading{padding-top:12px;border-top:1px solid var(--line)}
@media(max-width:1000px){.lesson-opening{grid-template-columns:1fr}.scene-picture{max-width:550px}.analogy-grid{gap:8px}.analogy-card{padding:14px}}
@media(max-width:700px){.lesson-opening{padding:17px;gap:17px}.scene-story h2{font-size:19px}.scene-story p{font-size:13px}.look-for{font-size:12px}.analogy-grid{grid-template-columns:1fr}.analogy-card{display:grid;grid-template-columns:1fr 1fr;gap:5px 15px;padding:16px}.analogy-card .analogy-eyebrow{grid-column:1}.analogy-card b{grid-column:1;grid-row:2}.analogy-bridge{display:none}.analogy-technical{grid-column:2;grid-row:1/3;align-self:center}.analogy-card p{grid-column:1/-1;margin:6px 0 0}.learning-map{padding:18px}.map-nodes{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.map-flow .map-nodes{grid-template-columns:1fr;gap:22px}.map-flow .map-node{flex-direction:row;text-align:left;gap:14px;padding:14px 18px}.map-flow .map-icon{margin:0;flex-shrink:0}.map-flow .map-step-number{left:auto;right:10px;top:8px}.map-flow .map-node:not(:last-child):after{content:'↓';right:50%;top:auto;bottom:-23px;transform:translateX(50%)}.map-node-copy b{font-size:13px}.map-detail{min-height:0;padding:16px}.field-case summary b{display:block;margin:8px 0 0}.hero-scene figcaption{font-size:12px;padding:16px 18px}}
@media print{.map-node{break-inside:avoid}.learning-map{break-inside:avoid}.map-nodes button{display:flex!important}.lesson-opening{break-inside:avoid}.field-case:not([open])>*:not(summary){display:block!important}.scene-picture img{max-height:220px;width:auto}}

/* Lesson-specific vector figures: preserve labels, allow a full-size view. */
.topic-opening .scene-picture{width:100%;max-width:560px;justify-self:center}
.topic-opening .scene-picture figcaption{font-size:11px;line-height:1.8;margin-top:12px}
.diagram-expand{display:inline-block;margin-top:8px;padding:9px 12px;border:1px solid var(--line);border-radius:6px;font-size:12px;color:var(--ink);background:#f8faf3}
.diagram-expand:focus-visible{outline:3px solid #39714d;outline-offset:3px}
@media(max-width:700px){.topic-opening .scene-picture{width:calc(100% + 16px);max-width:none}.topic-opening .scene-picture figcaption,.topic-opening .diagram-expand{margin-left:8px;margin-right:8px}}