:root{color-scheme:light;--ink:#193d36;--muted:#4e665f;--green:#125d50;--soft:#e7f1ec;--paper:#f4f6ef;--line:#bdd0c6;--white:#fffefa;--amber:#735012;font-family:'Segoe UI',Arial,sans-serif;font-weight:400;font-size:16px;line-height:1.6}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip:not(:focus){clip-path:inset(50%);width:1px;height:1px;overflow:hidden}.hub-start{display:inline-flex;align-items:center;min-height:44px;padding:10px 18px;background:var(--green);color:white;border-radius:7px;text-decoration:none}.hub-start:hover{background:#0c493f}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink)}h1,h2,h3,h4,p{margin:0 0 12px}h1,h2,h3,h4,strong,b{font-weight:400}a{color:var(--green);text-underline-offset:4px}button,input,select{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer;min-height:44px;border:1px solid var(--line);border-radius:7px;padding:10px 17px;background:var(--white);color:var(--ink)}button:hover{background:var(--soft)}button.primary{background:var(--green);border-color:var(--green);color:white}button.primary:hover{background:#0c493f}button:disabled{cursor:default;opacity:.65}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #ad7419;outline-offset:3px}[hidden]{display:none!important}.skip{position:fixed;top:-80px;left:16px;z-index:100;padding:12px;background:white}.skip:focus{top:12px}.site-header{max-width:1280px;margin:auto;padding:22px 32px;display:flex;align-items:center;justify-content:space-between;gap:22px}.brand{display:flex;align-items:center;gap:12px;font-size:23px;text-decoration:none}.brand small{display:block;font-size:12px;color:var(--muted)}.site-header nav{display:flex;flex-wrap:wrap;gap:20px;font-size:14px}.site-header nav a{min-height:44px;display:flex;align-items:center}main{max-width:1216px;margin:auto;padding:0 28px}.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:54px;padding:40px 0 32px}.eyebrow{font-size:11px;letter-spacing:.14em;color:var(--muted);text-transform:uppercase}.hero h1{font-size:clamp(36px,5vw,61px);line-height:1.08;letter-spacing:-.035em;margin:18px 0}.deck{font-size:clamp(20px,2.6vw,30px);line-height:1.35}.hero p:not(.deck){max-width:60ch}.pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:23px}.pills span{border:1px solid var(--line);padding:4px 11px;border-radius:24px;font-size:12px}.hero-art{align-self:center;position:relative;padding:28px;background:var(--soft);border:1px solid var(--line);border-radius:18px;transform:rotate(1deg)}.mini-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;font-size:13px;margin-bottom:13px}.mini-top code{background:white;padding:3px 8px;border-radius:4px}.mini-cells{display:grid;grid-template-columns:repeat(3,1fr);border-left:1px solid var(--line);border-top:1px solid var(--line)}.mini-cells span{padding:12px;background:white;border-right:1px solid var(--line);border-bottom:1px solid var(--line);text-align:center}.mini-cells .result{background:var(--green);color:white}.hero-art>p{font-size:12px;margin:14px 0 0}.tiny-bars{display:flex;align-items:end;gap:7px;height:54px;position:absolute;right:28px;bottom:-24px}.tiny-bars i{display:block;background:#ce874a;width:17px;border:2px solid var(--paper);height:31px;border-radius:3px}.tiny-bars i:nth-child(2){height:52px}.tiny-bars i:nth-child(3){height:24px}.tiny-bars i:nth-child(4){height:42px}.course-status{padding:18px 22px;background:white;border:1px solid var(--line);border-radius:10px;display:flex;align-items:center;justify-content:space-between;gap:28px;margin:12px 0 28px}.course-status p{margin:0;font-size:14px}#saveStatus{font-size:12px;color:var(--muted)}.progress-wrap{flex:0 0 225px}.progress-wrap label{font-size:13px;display:block;margin-bottom:5px}progress{width:100%;height:9px;accent-color:var(--green)}.course-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:24px;align-items:start}.trail{position:sticky;top:16px}.trail h2{font-size:19px}.trail>p{font-size:13px;color:var(--muted)}#dayNav{display:grid;gap:9px}#dayNav button{display:grid;grid-template-columns:29px minmax(0,1fr);text-align:left;gap:8px;line-height:1.4;padding:14px 11px}#dayNav .day-num{font-size:14px;width:27px;height:27px;display:grid;place-items:center;background:var(--soft);border-radius:50%}#dayNav small{display:block;font-size:11px;margin-top:5px;color:var(--muted)}#dayNav button[aria-current=step]{background:var(--green);border-color:var(--green);color:white}#dayNav button[aria-current=step] small{color:#e1eee9}#dayNav button[aria-current=step] .day-num{color:var(--green)}.trail-download{display:block;margin:17px 4px;font-size:13px}.workspace{background:var(--white);border:1px solid var(--line);border-radius:12px;overflow:hidden;min-width:0}.lesson-header{padding:27px 29px 22px}.lesson-header h2{font-size:30px;line-height:1.2;margin:9px 0 13px}.lesson-header>p:not(.eyebrow){font-size:15px}.skill-label{color:var(--green)}.phase-nav{display:grid;grid-template-columns:repeat(3,1fr);padding:0 24px;gap:7px;border-bottom:1px solid var(--line)}.phase-nav button{border-radius:8px 8px 0 0;border-bottom:0;display:flex;justify-content:center;align-items:center;gap:7px;background:#eef2ed;padding:12px 7px}.phase-nav button[aria-selected=true]{background:var(--green);color:white;border-color:var(--green)}.phase-nav .step-symbol{font-size:12px}#lessonPanel{padding:26px 28px;min-height:390px}#lessonPanel h3{font-size:22px;line-height:1.35}#lessonPanel h4{font-size:17px}.concept{padding:18px 20px;background:var(--soft);border-left:3px solid var(--green);border-radius:5px;margin:16px 0 23px}.concept p{margin:0}.steps{padding-left:24px;margin:0 0 23px}.steps li{padding:0 0 12px 5px}.example{overflow-x:auto;margin-bottom:22px}.example table{width:100%;border-collapse:collapse;font-size:14px}.example td,.example th{border:1px solid var(--line);padding:8px 12px;text-align:left;font-weight:400}.example th{background:var(--soft)}.example caption{text-align:left;font-size:13px;margin-bottom:8px;color:var(--muted)}.example .rownum{width:36px;background:var(--soft)}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:19px}.notice{padding:14px 16px;border:1px solid var(--line);border-radius:7px;background:#faf5e8;color:var(--amber);font-size:13px;margin:16px 0}.missions{margin:8px 0 19px;padding-left:22px}.missions li{padding-bottom:5px}.grid-bar{display:grid;grid-template-columns:65px minmax(0,1fr);gap:8px;padding:10px;background:var(--soft);border:1px solid var(--line);border-bottom:0;border-radius:8px 8px 0 0}.grid-bar output{background:white;border:1px solid var(--line);padding:4px 9px;min-height:34px}.grid-bar #formulaValue{font-family:Consolas,monospace;overflow-wrap:anywhere}.sheet-viewport{width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:0 0 8px 8px}.practice-sheet{width:100%;min-width:310px;border-collapse:collapse;table-layout:fixed;background:white}.practice-sheet.fourcols{min-width:455px}.practice-sheet th{font-size:12px;background:#edf3ef;font-weight:400;height:28px}.practice-sheet th:first-child{width:30px}.practice-sheet td,.practice-sheet th{border:1px solid #d3ddd6;padding:0}.practice-sheet input{width:100%;min-width:0;border:0;outline:none;background:transparent;padding:10px 8px;border-radius:0;color:var(--ink);height:46px;font-size:16px}.practice-sheet td:focus-within{outline:2px solid var(--green);outline-offset:-2px}.practice-sheet input:focus-visible{outline:none}.practice-sheet .heading-bold input{text-shadow:.35px 0 currentColor}.practice-sheet .heading-fill{background:#e2e7e4}.practice-sheet.has-borders td{border:1px solid #6a7f74}.practice-sheet.unfitted{width:270px;min-width:270px}.practice-sheet.unfitted td input{padding-right:3px}.format-tools{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:13px}.format-tools button{font-size:12px;padding:8px 10px}.format-tools button[aria-pressed=true]{background:var(--green);color:white}.small-note{font-size:12px;color:var(--muted);margin:9px 0 17px}.lab-feedback{padding:16px 18px;background:#f0f5ef;border:1px solid var(--line);border-radius:8px;margin-top:17px}.lab-feedback ul{padding:0;margin:8px 0 0;list-style:none}.lab-feedback li{margin:8px 0;font-size:14px}.lab-feedback .check-pass{color:var(--green)}.lab-feedback .check-fail{color:#8b3d26}.live-total{font-size:14px;padding:10px;background:var(--soft);margin-top:12px}.chart-tools{margin-top:19px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px;align-items:end}.chart-tools label{font-size:13px}.chart-tools input{display:block;width:100%;padding:10px;border:1px solid var(--line);border-radius:6px;margin-top:4px}.chart-output{margin-top:16px;min-width:0}.chart-output svg{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:8px;background:white}.chart-description{font-size:13px;margin:8px 0}.quiz-question{border:1px solid var(--line);padding:17px 20px;margin:0 0 20px;border-radius:7px;min-width:0}.quiz-question legend{padding:0 6px;font-size:16px}.quiz-question label{display:flex;gap:11px;align-items:center;padding:9px 0;cursor:pointer;min-height:44px}.quiz-question input{width:19px;height:19px;accent-color:var(--green);flex-shrink:0}.quiz-feedback{padding:9px 11px;background:var(--soft);font-size:14px;margin-top:10px}.transfer{border-top:1px solid var(--line);margin-top:28px;padding-top:23px}.transfer label{display:flex;gap:9px;align-items:start;font-size:14px}.transfer input{width:19px;height:19px;flex-shrink:0}.transfer p{font-size:14px}.lesson-bottom{padding:17px 27px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:13px;border-top:1px solid var(--line);background:#edf3eb}.lesson-bottom span{font-size:13px;color:var(--muted)}.resources{display:grid;grid-template-columns:1fr 1fr;gap:35px;padding:34px;border:1px solid var(--line);border-radius:12px;background:var(--soft);margin:34px 0 20px}.resources h2{font-size:27px}.resources p{font-size:14px}.resource-links{display:grid;align-content:center;gap:11px}.resource-links a{display:block;padding:15px 19px;border:1px solid var(--line);background:white;border-radius:8px;text-decoration:none}.resource-links a:hover{text-decoration:underline}.resource-links span{display:block;font-size:12px;color:var(--muted);margin-top:4px}.adult-notes{padding:20px;border:1px solid var(--line);border-radius:9px}.adult-notes summary{cursor:pointer;min-height:30px}.adult-notes p{font-size:14px;max-width:95ch;margin:17px 0 0}.site-footer{max-width:1216px;margin:28px auto;padding:18px 28px 32px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:12px}.hub-card{padding:30px;background:var(--white);border:1px solid var(--line);border-radius:12px;margin:25px 0}.hub-card h2{font-size:30px}.hub-card p{max-width:65ch}.hub-outcomes{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin:22px 0;padding:0;list-style:none}.hub-outcomes li{background:var(--soft);padding:15px;border-radius:7px;font-size:14px}.hub-outcomes span{display:block;font-size:12px;color:var(--muted);margin-bottom:5px}
@media(max-width:950px){.course-layout{grid-template-columns:1fr}.trail{position:static}#dayNav{grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}#dayNav button{grid-template-columns:1fr;font-size:12px;padding:10px;gap:7px}#dayNav small{font-size:10px}.trail-download{margin-top:12px}.hero{gap:25px}.site-header{padding:18px 28px}.hero-art{padding:21px}.hub-outcomes{grid-template-columns:repeat(3,1fr)}}
@media(max-width:620px){main{padding:0 15px}.site-header{padding:16px;align-items:start;flex-direction:column;gap:8px}.site-header nav{gap:16px;font-size:12px}.brand{font-size:22px}.hero{grid-template-columns:1fr;padding:23px 4px 24px;gap:25px}.hero h1{font-size:44px}.hero-art{max-width:390px;width:100%;transform:none;margin-bottom:8px}.hero p:not(.deck){font-size:14px}.course-status{flex-direction:column;align-items:stretch;gap:13px;padding:16px}.progress-wrap{flex:0 1 auto}#dayNav{grid-template-columns:1fr 1fr}#dayNav button{grid-template-columns:26px 1fr}#dayNav button:last-child{grid-column:1/-1}.lesson-header{padding:23px 18px 18px}.lesson-header h2{font-size:27px}.phase-nav{padding:0 12px;gap:5px}.phase-nav button{font-size:14px}#lessonPanel{padding:22px 16px}.steps{padding-left:21px}.chart-tools{grid-template-columns:1fr}.format-tools{gap:6px}.resources{grid-template-columns:1fr;padding:22px 19px;gap:15px}.lesson-bottom{padding:16px}.quiz-question{padding:15px 13px}.site-footer{padding:16px}.hub-outcomes{grid-template-columns:1fr 1fr}.hub-card{padding:22px}.mini-cells span{padding:10px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media print{@page{size:A4 portrait;margin:15mm}.site-header nav,.trail,.phase-nav,.lesson-bottom,.actions,.format-tools,.chart-tools,.site-footer,.hero-art,.adult-notes{display:none!important}body,main,.workspace,.resources{background:white;color:black}.hero{display:block;padding:0}.hero h1{font-size:28px}.course-layout{display:block}.workspace{border:0}.course-status{margin:10px 0;padding:10px}.resources{break-inside:avoid;display:block;padding:15px;margin:10px 0}.practice-sheet{min-width:0!important}.resource-links a{padding:8px}.lesson-header,#lessonPanel{padding:10px 0}.chart-output svg{max-height:250px}}