:root{--ink:#17344b;--paper:#fff;--sky:#eaf4fb;--accent:#075f80;--leaf:#176746;--signal:#f9cf55;--line:#bbcbd6;--soft:#f4f8fa;font-family:'Atkinson Hyperlegible',system-ui,sans-serif;color:var(--ink);background:#f4f8fa;font-size:18px;line-height:1.55;color-scheme:light}
*{box-sizing:border-box}body{margin:0}h1,h2,h3,h4,button{font-family:Nunito,'Atkinson Hyperlegible',sans-serif}h1{font-size:clamp(2rem,4.5vw,3.5rem);line-height:1.1;letter-spacing:-.03em;margin:.25em 0}h2{font-size:1.8rem;line-height:1.2;margin:0 0 .6em}h3{font-size:1.2rem;line-height:1.3}p{max-width:75ch}a{color:var(--accent);text-underline-offset:3px}a:hover{text-decoration-thickness:3px}button,input,textarea,select{font:inherit}button{cursor:pointer;border:2px solid var(--accent);border-radius:9px;background:var(--accent);color:white;min-height:46px;padding:9px 17px;font-weight:800;line-height:1.3}button:hover{filter:brightness(.92)}button:disabled{opacity:.6;cursor:default}button.quiet{color:var(--accent);background:white}button[aria-pressed=true]{outline:3px solid var(--signal);outline-offset:1px}:focus-visible{outline:3px solid #ad4c00;outline-offset:4px}input,textarea,select{border:2px solid #788d9e;border-radius:6px;background:#fff;color:var(--ink);padding:9px;max-width:100%;min-height:46px}input[type=checkbox],input[type=radio]{min-height:22px;width:22px;height:22px;accent-color:var(--accent);flex:0 0 auto}input[readonly]{background:#edf1f4;border-color:#bcc8d0}textarea{width:100%;resize:vertical;line-height:1.5}label{font-weight:700}fieldset{border:0;padding:0;margin:20px 0}legend{font-weight:700;margin-bottom:10px}[hidden]{display:none!important}.skip-link{position:absolute;left:15px;top:-100px;padding:12px;background:white;z-index:50}.skip-link:focus{top:10px}.page-shell, .catalog-header, #catalog{max-width:1160px;margin:auto;padding:22px 28px}.crumbs{display:flex;gap:20px;flex-wrap:wrap;padding:4px 0 22px;font-size:.95rem}.lab-header{display:grid;grid-template-columns:110px 1fr;gap:25px;padding:20px 0 28px;border-bottom:4px solid var(--accent)}.lab-emblem{font-size:65px;display:grid;place-items:center;background:var(--sky);border-radius:24px 8px 24px 8px;width:110px;height:110px}.lesson-label{font-size:.95rem;font-weight:700;margin:0;color:#405d70}.mission-lead{font-size:1.1rem;margin-bottom:0}.toolbar{display:flex;gap:20px;align-items:center;padding:24px 0}.toolbar>label{display:grid;gap:5px;min-width:160px}.toolbar>p{font-size:.95rem;flex:1}.save-tools{font-size:.82rem;max-width:280px}.save-tools>div{display:flex;gap:8px;margin-top:8px}.save-tools button{font-size:.8rem;padding:8px 10px}.tabs{display:grid;grid-template-columns:repeat(6,1fr);gap:4px;background:#d6e2eb;padding:6px;border-radius:12px 12px 0 0}.tabs button{border:0;border-radius:7px;min-height:54px;background:transparent;color:var(--ink);padding:8px;font-size:.95rem}.tabs button[aria-selected=true]{background:white;box-shadow:0 2px 0 var(--accent);color:var(--accent)}#workspace{background:white;border:1px solid var(--line);border-top:0;border-radius:0 0 14px 14px;scroll-margin-top:12px}[role=tabpanel]{padding:32px;min-height:500px}.brief-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:35px}.large-copy{font-size:1.15rem}.objectives{padding-left:23px}.objectives li{margin:12px 0}.route-card,.review-card{background:var(--sky);border-top:5px solid var(--accent);padding:22px;border-radius:4px 4px 16px 16px}.route-card li{padding:6px 0}.ready-note{padding:2px 20px;border-left:5px solid var(--signal);margin:25px 0}.writing{display:block;margin:24px 0}.writing textarea{display:block;margin-top:9px;font-weight:400}.field-hint{display:block;font-size:.93rem;font-weight:400;margin:6px 0 10px;color:#425e70}.bottom-nav{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:22px 0}.bottom-nav p{font-size:.85rem}.lesson-switch,.game-menu{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}.lesson-switch button{flex:1;min-width:180px;font-size:.95rem}.worked-example{background:#f3f7fb;border-left:6px solid var(--accent);padding:18px 24px;margin:24px 0}.worked-example li{padding:8px 0 8px 8px}.worked-example li::marker{font-weight:800;color:var(--accent)}.worked-example button{margin-right:12px}details{margin:20px 0}summary{cursor:pointer;min-height:46px;font-weight:700;display:list-item;padding:8px 0}.vocab{border-top:1px solid var(--line);padding-top:10px}.vocab dl{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.vocab dl>div{border-bottom:1px solid var(--line);padding:0 0 15px}.vocab dt{font-weight:800}.vocab dd{margin:6px 0}.vocab-example{display:block;font-style:italic;margin-top:8px}.model-workspace{display:grid;grid-template-columns:minmax(0,1fr) 230px;border:2px solid var(--line);border-radius:14px;overflow:hidden;margin-top:20px}.model-picture{display:grid;place-items:center;min-height:340px;background:#f6fbfd;padding:10px}.model-picture svg{width:100%;height:auto;overflow:visible;font-size:16px;font-family:'Atkinson Hyperlegible',sans-serif}.model-picture text{fill:var(--ink);font-weight:700}.model-picture line{stroke:#6d8799;stroke-width:2}.model-picture .gridline{stroke:#cedce5;stroke-width:1}.model-picture .heavy{stroke:var(--ink);stroke-width:4}.model-picture .dashed{stroke:var(--ink);stroke-dasharray:5 4}.model-picture .shape{fill:#f9cf55;stroke:#84640c;stroke-width:1.5}.model-picture .shape-alt{fill:#82c7df;stroke:#266580;stroke-width:1.5}.model-picture .shape-light{fill:#d6e9f2;stroke:#47728c;stroke-width:2}.model-picture .point{fill:var(--accent);stroke:white;stroke-width:2}.model-picture .point-alt{fill:#a84820;stroke:white;stroke-width:2}.model-picture .open-point{fill:white;stroke:var(--accent);stroke-width:3}.model-picture .plot{stroke:var(--accent);stroke-width:2}.model-picture .solution{stroke:var(--accent);stroke-width:6}.model-controls{padding:18px;background:#edf4f8;display:flex;flex-direction:column;gap:14px;justify-content:center}.model-controls label{font-size:.88rem;display:grid;gap:5px}.model-controls input{width:100%;font-size:1.05rem}.model-readout{background:#edf6ef;padding:16px 20px;border-left:5px solid var(--leaf);font-size:1rem}.model-readout strong{font-size:1.1rem}.model-readout p{margin:8px 0 0}.model-error{color:#8a2616;min-height:0}.model-error:empty{display:none}.investigation-prompts article{border-top:2px solid var(--line);margin-top:28px;padding-top:12px}.stretch-task{padding:18px;background:#fff6d7;border-left:5px solid #996d09}.question-nav{display:flex;flex-wrap:wrap;gap:9px;margin:24px 0}.question-nav button{background:white;color:var(--accent);min-width:46px;padding:8px}.question-nav button[aria-pressed=true]{background:var(--accent);color:white}.question{max-width:820px;margin:auto}.question-prompt{font-size:1.12rem}.choice{display:flex;align-items:flex-start;gap:14px;background:#f3f7fa;border:2px solid #d6e1e9;border-radius:8px;padding:14px;margin:10px 0;font-weight:400}.choice:has(input:checked){border-color:var(--accent);background:#e4f1f8}.choice input{margin-top:3px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 14px}.practice-feedback{padding:0;min-height:30px}.practice-feedback.correct{color:#145133;border-left:5px solid #176746;padding:15px;background:#edf6ef}.practice-feedback.retry{color:#6e4209;border-left:5px solid #a8660a;padding:15px;background:#fff4df}.hint-area p{padding:12px 18px;background:#fff8df;border-left:4px solid #c49514}.explanation{padding:18px 22px;background:#edf5fa;border-left:5px solid var(--accent)}.explanation h4{margin-top:0}.practice-pagination{display:flex;justify-content:space-between;margin-top:28px;gap:14px}.number-answer{display:grid;gap:9px;max-width:450px}.parameter-list{background:var(--soft);padding:15px 35px}.create-layout{display:grid;grid-template-columns:1.5fr 1fr;gap:25px}.check-item{display:flex;gap:12px;font-weight:400;margin:15px 0}.round-heading{display:flex;align-items:baseline;justify-content:space-between;gap:15px}.mission-track{display:flex;gap:15px;margin:12px 0 22px}.mission-track span{display:grid;place-items:center;border:2px solid var(--accent);color:var(--accent);width:50px;height:50px;border-radius:50%;font-weight:800}.mission-track .earned{background:var(--leaf);border-color:var(--leaf);color:white}.target{background:#fff4ce;border-left:5px solid #9a7210;padding:18px;font-size:1.18rem;font-weight:700}.game-feedback{font-weight:700;min-height:30px}.match-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.match-card{min-height:155px;padding:15px;background:#e7f2f8;color:var(--ink);border-color:#7198af;font-weight:600;font-size:.98rem;display:flex;flex-direction:column;gap:14px;justify-content:center}.match-card .card-kind{font-size:.85rem;font-weight:800;color:#335a70}.match-card.selected{background:#fff2c6;border-color:#977008}.match-card.matched{opacity:1;background:#e1f2e8;border-color:var(--leaf)}.game-win{padding:35px;background:#edf6ef;text-align:center}.game-win p{margin:15px auto}.win-icon{font-size:65px}.game-win button{margin:10px}footer{font-size:.88rem;margin:30px auto;max-width:1100px;padding:12px 0}footer p{color:#425e70}.lesson-links{display:flex;gap:14px;flex-wrap:wrap}.print-only{display:none}.load-error{max-width:700px;margin:60px auto;padding:25px}.catalog-header{padding-top:35px}.catalog-header>p:first-of-type{font-size:1.5rem}.catalog-note{font-size:1rem;padding:15px 20px;background:white;border-left:5px solid var(--signal)}.unit-nav{display:flex;flex-wrap:wrap;gap:10px;margin-top:25px}.unit-nav a{padding:9px 14px;background:white;border:1px solid #b8cad7;border-radius:7px;min-height:46px}.catalog-unit{margin:22px 0 45px;scroll-margin-top:20px}.catalog-unit>h2{border-bottom:3px solid var(--accent);padding-bottom:15px}.catalog-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.lab-card{position:relative;background:white;border:1px solid #c4d2dc;border-top:5px solid var(--accent);padding:24px 26px;border-radius:8px 8px 18px 18px}.lab-card-icon{font-size:2.7rem;float:right;margin:0 0 12px 12px}.lab-card h3{font-size:1.5rem;margin:14px 0}.card-detail{font-size:.9rem;border-top:1px solid #d5e1e9;padding-top:12px}.section-intro{max-width:820px}
@media(max-width:900px){.model-workspace{grid-template-columns:1fr}.model-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.model-picture{min-height:280px}.toolbar{flex-wrap:wrap}.save-tools{max-width:none;width:100%;display:flex;gap:20px;align-items:center}.brief-layout,.create-layout{grid-template-columns:1fr}.match-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.lab-header{grid-template-columns:80px 1fr;gap:18px}.lab-emblem{width:80px;height:80px;font-size:48px}}
@media(max-width:600px){:root{font-size:17px}.page-shell,.catalog-header,#catalog{padding:15px}.lab-header{grid-template-columns:1fr;padding-top:10px}.lab-emblem{width:65px;height:65px;font-size:40px}.tabs{grid-template-columns:repeat(3,1fr);gap:5px}.tabs button{min-height:48px}.toolbar>p{min-width:150px}.save-tools{flex-wrap:wrap;gap:5px}.save-tools>div{width:100%}[role=tabpanel]{padding:22px 16px}.model-picture{padding:5px;min-height:200px}.model-picture svg{font-size:18px}.model-controls{padding:12px;gap:12px}.model-readout{padding:14px}.vocab dl,.catalog-grid{grid-template-columns:1fr}.match-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.match-card{min-height:180px}.bottom-nav{flex-wrap:wrap}.bottom-nav p{order:3;width:100%;text-align:center;margin:0}.bottom-nav button{font-size:.9rem;flex:1}.practice-pagination button{font-size:.9rem}.worked-example{padding:14px}.worked-example ol{padding-left:24px}.worked-example button{margin-top:8px}.lab-card{padding:20px}.actions button{flex:1 1 150px}.round-heading{display:block}.round-heading p{margin:0}.lesson-switch button{font-size:.9rem}footer{padding:12px 15px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{body{background:white;color:black}.page-shell{max-width:none;padding:0}.page-shell>*{display:none!important}.page-shell>#print-report{display:block!important}#print-report pre{white-space:pre-wrap;font-family:inherit;font-size:12pt;line-height:1.45}#print-report h1{font-size:22pt}a{color:black}.print-only{display:block}@page{margin:18mm}}
.model-workspace[data-kind="data"]{grid-template-columns:1fr}
.model-workspace[data-kind="data"] .model-picture svg{max-width:720px}
.model-workspace[data-kind="data"] .model-controls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.model-workspace[data-kind="coordinates"] .model-picture svg{max-width:440px}
@media(max-width:600px){.model-workspace[data-kind="data"] .model-controls{grid-template-columns:repeat(2,minmax(0,1fr))}}