*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:85px}body{margin:0;background:#f4f3ef;color:#203039;font:17px/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}a{color:#075c5a;text-underline-offset:4px}button,a.primary{cursor:pointer}button,input,textarea{font:inherit}header{position:sticky;top:0;z-index:2;display:flex;align-items:center;gap:24px;min-height:72px;padding:16px 4vw;background:#f4f3eff2;border-bottom:1px solid #d5dbd7;backdrop-filter:blur(10px)}header a{text-decoration:none}.brand{font-weight:850;letter-spacing:.08em;margin-right:auto;color:#203039}.brand span{font-weight:400}.brand small{display:block;font-size:10px;letter-spacing:.2em}.layout{display:grid;grid-template-columns:285px minmax(0,900px);gap:4vw;max-width:1350px;margin:auto;padding:36px 3vw}aside{position:sticky;top:100px;align-self:start;font-size:14px;max-height:calc(100vh - 110px);overflow:auto;padding-right:12px}aside nav{display:grid;gap:3px;margin:12px 0}aside nav a{display:flex;gap:12px;padding:7px 6px;text-decoration:none;border-radius:5px;color:#48585e}aside nav a:hover,aside nav a:focus-visible{background:#e1e8e3;color:#075c5a}aside nav span{font-size:11px;color:#677d77;margin-top:4px}aside>a{display:block;margin:12px 0}.eyebrow,.lesson-meta{font-size:11px;font-weight:750;letter-spacing:.14em;color:#256f65}.hero{padding:36px 0 60px;border-bottom:1px solid #cbd8cf}.hero h1{font-size:clamp(38px,4.3vw,65px);line-height:1.14;letter-spacing:-.05em;max-width:780px;margin:22px 0}.lead{font-size:21px;max-width:680px;color:#475d60}.tags{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}.tags span{border:1px solid #bdcfc6;padding:5px 12px;border-radius:24px;font-size:13px}.primary{display:inline-block;background:#0d5d56;color:white;padding:12px 20px;border-radius:4px;text-decoration:none}.intro{font-size:14px;max-width:620px;margin-top:25px;color:#5a6b70}.overview{padding:32px 0}.overview h2{font-size:26px}.levels{display:grid;grid-template-columns:1fr 1fr;gap:12px}.levels div{background:#e5ebe4;padding:18px}.levels b{font-size:12px;letter-spacing:.08em}.levels p{font-size:15px;margin-bottom:0}.lesson{background:#fff;border:1px solid #dce3dd;border-radius:8px;padding:36px;margin:24px 0 40px;scroll-margin-top:95px}.lesson h2{font-size:30px;line-height:1.25;letter-spacing:-.025em;margin:12px 0 20px}.lesson h3{font-size:18px;margin-top:28px}.goal{font-size:19px;color:#1b625b;padding-bottom:20px;border-bottom:1px solid #e3e9e5}li{padding-left:4px;margin:12px 0}ol,ul{padding-left:24px}.exercise{padding:4px 20px 20px;background:#edf3e9;border-left:3px solid #578d73;margin-top:24px}.exercise label{display:block;font-size:13px;font-weight:650}textarea{width:100%;padding:12px;border:1px solid #bccfc4;background:white;border-radius:4px;resize:vertical;margin-top:8px;font-size:15px}.answer{padding:16px;background:#f6f4ee;border:1px solid #e5e0d2;margin-top:16px}.answer summary{cursor:pointer;font-weight:650}.trouble,.coach{font-size:15px;color:#526267}.done{display:flex;align-items:flex-start;gap:10px;border-top:1px solid #e0e7e1;padding-top:20px;font-size:15px;font-weight:650}.done input{width:20px;height:20px;accent-color:#0d5d56;flex-shrink:0}.progress-box{padding:16px 0;border-top:1px solid #d0dcd3;margin-top:20px}.progress-box label{display:flex;justify-content:space-between}progress{display:block;width:100%;height:8px;margin:12px 0;accent-color:#0d5d56}small{font-size:12px;color:#5e716b}button{padding:8px 12px;border:1px solid #aac3b7;background:transparent;color:#0d5d56;border-radius:4px;display:block;margin:8px 0;font-size:13px}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid #dce5de;vertical-align:top}th{background:#eaf1eb;white-space:nowrap}footer{display:flex;justify-content:space-between;gap:16px;font-size:13px;margin:30px 0}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:10px;z-index:5;background:white;padding:10px}:focus-visible{outline:3px solid #b78828;outline-offset:3px}#save-status{font-size:12px;color:#845c1a}@media(max-width:850px){.layout{grid-template-columns:1fr;padding:16px}.hero{padding-top:15px}aside{position:static;max-height:none;padding:0;border-bottom:1px solid #ccd7ce}aside nav{grid-template-columns:1fr 1fr;max-height:210px;overflow:auto}aside nav a{font-size:12px}.progress-box{margin-top:10px;padding:10px 0}aside button{display:inline-block;margin-right:8px}.hero h1{font-size:42px}.lesson{padding:24px 20px}.lesson h2{font-size:27px}header{gap:16px;padding:12px 16px}header>a:not(.brand){font-size:13px}}@media(max-width:440px){.levels{grid-template-columns:1fr}.hero h1{font-size:36px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{header,aside,.skip,textarea,.exercise label,.done{display:none!important}.layout{display:block;padding:0}body{font-size:11pt;background:white;color:black}.hero{padding:0 0 20px}.hero h1{font-size:30pt}.lesson{border:0;border-top:1px solid #aaa;padding:20px 0;margin:0;break-before:page}h2,h3{break-after:avoid}li{break-inside:avoid}.levels{display:block}a{color:black}.answer{display:block}footer{display:none}.primary{display:none}}