:root{color-scheme:light;--ink:#193e34;--muted:#52665c;--green:#145e4b;--paper:#fbfcf7;--line:#cbd9cb;--cream:#f4f0df;--accent:#f1cf85;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;font-size:17px;line-height:1.65}h1,h2,h3,h4,strong,b{font-weight:400}h1,h2,h3,p{margin:0 0 18px}h1{font-family:Georgia,serif;font-size:clamp(38px,5.2vw,68px);line-height:1.1;letter-spacing:-.035em}h2{font-family:Georgia,serif;font-size:30px;line-height:1.25}h3{font-size:21px;line-height:1.35}a{color:var(--green);text-underline-offset:4px}a:hover{color:#854b0c}button,input,select,textarea{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 17px;border:1px solid var(--green);border-radius:9px;background:#fff;color:var(--green);text-decoration:none;cursor:pointer;line-height:1.4}button:hover,.button:hover{background:#e7efdf;color:var(--ink)}.primary{background:var(--green);color:#fff}.primary:hover{background:#0c4737;color:#fff}button:disabled{opacity:.5;cursor:default}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #b57517;outline-offset:4px}[hidden]{display:none!important}.skip{position:absolute;left:20px;top:-100px;z-index:20;background:white;padding:12px}.skip:focus{top:8px}
header,main,footer{max-width:1240px;margin:auto;padding-left:32px;padding-right:32px}header{display:flex;justify-content:space-between;align-items:center;gap:24px;padding-top:22px;padding-bottom:22px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:Georgia,serif;font-size:27px}.brand small{display:block;font:12px Arial,sans-serif;letter-spacing:.07em;color:var(--muted)}header nav{display:flex;flex-wrap:wrap;gap:12px 22px;font-size:14px}header nav a{padding:6px 0}main{padding-bottom:40px}footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:18px;padding-top:26px;padding-bottom:30px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.eyebrow{font-size:12px;letter-spacing:.11em;line-height:1.6;color:var(--green);margin-bottom:13px}.deck{font-size:22px;line-height:1.5;color:#466356}.small{font-size:14px;line-height:1.6;color:var(--muted)}.actions{display:flex;flex-wrap:wrap;align-items:center;gap:18px;margin:26px 0}.hero{display:grid;grid-template-columns:1.08fr 1fr;gap:70px;align-items:center;padding:70px 0}.hero-map{background:#e9efdf;border-radius:22px;padding:34px}.hero-map>div{display:flex;gap:24px;border-bottom:1px solid #c5d2bc;padding:18px 0}.hero-map>div>span{width:58px;flex:none;font-family:Georgia,serif;font-size:27px}.hero-map p{margin:0}.hero-map small{display:block;font-size:13px;color:var(--muted)}.hero-map>.small{margin-top:22px}.intro{display:flex;justify-content:space-between;align-items:end;gap:25px;margin:30px 0}.intro label{font-size:13px;min-width:200px}.intro h2{margin-bottom:0}select,textarea{display:block;background:#fff;color:var(--ink);border:1px solid #8da798;border-radius:7px;padding:10px 12px;max-width:100%;width:100%;min-height:44px;margin-top:6px}textarea{resize:vertical;min-height:115px}.grade-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.grade-card,.lesson-card{background:#fff;border:1px solid var(--line);border-radius:15px;padding:25px;display:flex;flex-direction:column}.grade-card:nth-child(3n+2){background:#f3f5eb}.grade-card:nth-child(3n+3){background:#faf4e7}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}.number{font-size:32px;font-family:Georgia,serif;color:#587363}.card-top p{margin:0}.grade-card h2 a,.lesson-card h2 a{text-decoration:none}.grade-card>ul{padding-left:19px;margin:0 0 22px;font-size:14px}.grade-card>p{font-size:15px}.card-link{margin-top:auto;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;text-decoration:none;font-size:15px}.feature{padding:35px;margin:42px 0;border-radius:18px;background:var(--cream)}.four-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:25px;margin:26px 0}.four-grid h3{font-size:18px}.four-grid p{font-size:15px}.split{display:grid;grid-template-columns:1fr 1fr;gap:48px}.breadcrumbs{display:flex;flex-wrap:wrap;gap:12px;font-size:13px;margin-top:28px}.grade-hero,.lesson-hero{padding:40px 0 25px;max-width:920px}.grade-hero h1{font-size:58px}.lesson-hero h1{font-size:clamp(34px,4.7vw,54px)}.space-panel{display:grid;grid-template-columns:1fr 1fr;gap:32px;padding:24px;background:#eaf0e5;border:1px solid var(--line);border-radius:12px;margin:20px 0 32px}.space-panel label{font-size:15px}.space-panel p{margin:12px 0}.progress-panel{margin:34px 0}progress{display:block;width:100%;height:13px;accent-color:var(--green);margin:14px 0}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.lesson-card h2{font-size:27px}.lesson-card .small{margin-top:auto}.jump-links{display:flex;flex-wrap:wrap;gap:13px 24px;font-size:14px;margin:25px 0 0}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:36px}.lesson-body{min-width:0}.lesson-body>section{margin-bottom:42px}.example{padding:21px 25px;border-left:4px solid #caa151;background:#f7f0de;border-radius:0 10px 10px 0;margin:25px 0}.example p:last-child{margin-bottom:0}.animation-panel{border:1px solid var(--line);border-radius:14px;padding:24px;background:white}.animation-heading{display:flex;align-items:start;justify-content:space-between;gap:16px}.animation-heading h2{font-size:26px}.animation-heading span{font-size:13px;white-space:nowrap}#animationScene{background:#f7faf4;border-radius:9px}#animationScene svg{display:block;width:100%;height:auto}#animationScene text{font-family:Arial,Helvetica,sans-serif}#animationScene .bar{transform-box:fill-box;transform-origin:left center}.step-explanation{margin:22px 0;min-height:140px}.step-explanation h3{color:var(--green)}.controls{display:flex;flex-wrap:wrap;gap:10px}.controls button{font-size:14px;padding:10px 13px}.motion-options{display:flex;gap:24px;align-items:center;flex-wrap:wrap;margin:22px 0;font-size:14px}.motion-options>label:first-child{min-width:140px}.choice{display:flex;align-items:flex-start;gap:12px;margin:12px 0;font-size:16px;cursor:pointer}.choice input{flex:none;margin-top:5px;width:19px;height:19px;accent-color:var(--green)}details{border-top:1px solid var(--line);padding-top:16px}summary{cursor:pointer}.step-list{padding-left:24px}.step-list button{text-align:left;justify-content:start;border:0;background:none;text-decoration:underline;font-size:16px;padding-left:0}.step-list p{font-size:14px}.question{min-width:0;margin:24px 0;padding:24px;border:1px solid var(--line);border-radius:10px}.question legend{padding:0 8px;font-size:18px}.question>label:not(.choice){display:block;margin:14px 0;font-size:14px}.question select{font-size:16px}.answer{padding:13px;background:#fff3dc;border-radius:7px;margin-top:16px;font-size:15px}.answer[data-pass=true]{background:#e6f1df}.lesson-body textarea{margin-bottom:23px}.lesson-aside{font-size:14px}.lesson-aside>section{background:#f0f3e7;border-radius:12px;padding:22px;margin-bottom:22px}.lesson-aside h2{font-size:23px}.lesson-aside h3{font-size:18px}.lesson-aside ul{padding-left:18px}.lesson-aside .space-panel{display:block;padding:16px;gap:0}.lesson-aside .space-panel>div+div{border-top:1px solid var(--line);margin-top:20px;padding-top:8px}.lesson-aside .small{font-size:12px}.lesson-aside .button{margin-bottom:12px;font-size:13px}.next-lesson{border-top:1px solid var(--line);padding-top:25px;margin-top:30px}.guide-page main{max-width:calc(180mm + 64px)}.print-intro,.print-lesson,.print-end{background:#fff;padding:28px 0;border-bottom:1px solid var(--line);margin:20px 0 40px}.guide-page h1{font-size:40px}.guide-page h2{font-size:28px}.guide-page h3{font-size:21px}.guide-page li{margin-bottom:8px}.print-project{border-top:1px dashed var(--line);padding-top:28px;margin-top:35px}.writing-lines{border:1px solid var(--line);padding:20px;margin:22px 0}.print-questions p{margin:8px 0}.answer-line{font-size:14px}.criteria{list-style:none;padding-left:0}.answer-guide{padding-left:24px}
@media(max-width:950px){.hero{gap:30px;padding:45px 0}.hero-map{padding:24px}.grade-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.four-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{display:block}.lesson-aside{display:grid;grid-template-columns:1fr 1fr;gap:20px}.lesson-aside .space-panel{margin-top:0}.lesson-aside>section{margin-bottom:0}.animation-panel{max-width:800px}}
@media(max-width:620px){header,main,footer{padding-left:20px;padding-right:20px}header{align-items:start;flex-direction:column;gap:15px;padding-top:18px;padding-bottom:18px}header nav{gap:9px 19px;font-size:13px}.brand{font-size:25px}.hero{display:block;padding:35px 0}.hero-map{margin-top:30px}.hero .deck{font-size:21px}.hero h1{font-size:49px}.intro{display:block}.intro label{display:block;margin-top:20px}.grade-grid,.lesson-grid,.split,.space-panel,.lesson-aside{grid-template-columns:1fr}.grade-card,.lesson-card{padding:24px}.feature{padding:25px;margin:30px 0}.four-grid{grid-template-columns:1fr;gap:8px}.split{gap:22px}.grade-hero h1{font-size:43px}.grade-hero,.lesson-hero{padding-top:30px}.deck{font-size:20px}.space-panel{gap:15px;padding:20px}.animation-panel{padding:15px}.animation-heading{display:block}.animation-heading h2{margin-bottom:6px;font-size:24px}.animation-heading span{display:block;margin-bottom:16px}.step-explanation{min-height:190px}.question{padding:15px}.question legend{font-size:17px}.question select{font-size:14px}.lesson-aside{display:grid}.guide-page h1{font-size:35px}.writing-lines{padding:15px;font-size:14px;overflow-wrap:anywhere}.answer-line{overflow-wrap:anywhere}.breadcrumbs{font-size:12px}.controls button{flex:1 1 40%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
@page{size:A4 portrait;margin:15mm}
@media print{html{scroll-behavior:auto}body{background:white;color:#172f28;font-size:10.5pt;line-height:1.38}header,footer,.skip,.no-print,.guide-page .actions{display:none!important}main,.guide-page main{padding:0;margin:0;max-width:none}.guide-page h1{font-size:27pt}.guide-page h2{font-size:19pt}.guide-page h3{font-size:13pt;margin:12pt 0 7pt}.eyebrow,.small{font-size:9pt}.guide-page p{margin:0 0 8pt}.guide-page li{margin-bottom:5pt}.guide-page ol,.guide-page ul{padding-left:20pt}.print-intro,.print-lesson,.print-end{padding:0;margin:0;border:0}.print-lesson,.print-end,.print-project{break-before:page;page-break-before:always}.print-project{border:0;margin:0;padding:0}.print-intro h2{margin-top:20pt}.example{padding:9pt 12pt;margin:12pt 0;border-left-width:3pt}.question,.writing-lines,.print-questions li,.answer-guide li{break-inside:avoid}.writing-lines{padding:14pt;margin:17pt 0;min-height:80pt}.print-project .writing-lines{min-height:160pt}.print-project .criteria{padding-left:0;line-height:1.8}.guide-page a{color:inherit;text-decoration:none}.guide-page .answer-line{font-size:10pt}.guide-page .print-questions p{margin:4pt 0}h2,h3{break-after:avoid}body:not(.guide-page) .controls,body:not(.guide-page) .motion-options,body:not(.guide-page) .space-panel{display:none}}
.hero-map>div>span{white-space:nowrap;width:72px}
html:not(.js-ready) .js-only{display:none!important}.space-actions{display:flex;flex-wrap:wrap;gap:12px}.reset-panel{background:white;border:1px solid #b69259;padding:20px;border-radius:10px;margin-top:18px}.reset-panel button{margin:5px 7px 0 0}.reset-panel p{font-size:15px}#storageNote{overflow-wrap:anywhere}@media print{.reset-panel,.space-actions{display:none!important}}

.js-ready .no-js-only{display:none}