@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#183c36;--muted:#687c76;--paper:#f7f8f3;--line:#dce4db;--green:#214f43;--lime:#d6edac;--white:#fff;--orange:#bd5c30}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px 'DM Sans',system-ui,sans-serif}h1,h2,h3,.brand{font-family:Manrope,system-ui,sans-serif}h1{font-size:clamp(30px,4vw,48px);letter-spacing:-1.8px;line-height:1.15;margin:10px 0 15px}h2{font-size:24px;letter-spacing:-.5px}h3{font-size:18px}p{line-height:1.7}a{color:inherit}button,input,select,textarea{font:inherit}button,.button{border:0;cursor:pointer;background:var(--green);color:white;padding:13px 21px;border-radius:10px;font-weight:600;text-decoration:none;display:inline-block;line-height:1.35}button:hover,.button:hover{filter:brightness(1.12)}button:disabled{opacity:.5;cursor:default}.secondary{background:#eaf0e6;color:var(--ink)}.quiet{background:transparent;color:var(--ink);border:1px solid var(--line)}:focus-visible{outline:3px solid #b58130;outline-offset:4px}.shell{display:grid;grid-template-columns:250px 1fr;min-height:100vh}aside{padding:34px 24px;background:#fff;border-right:1px solid var(--line);position:sticky;top:0;height:100vh;display:flex;flex-direction:column}.brand{font-weight:800;font-size:20px;text-decoration:none;display:flex;align-items:center;gap:9px}.brand-icon{display:grid;place-items:center;width:33px;height:36px;background:var(--green);color:var(--lime);border-radius:9px;font-size:28px}.caption,.eyebrow{font-size:11px;font-weight:700;letter-spacing:1.6px;color:var(--muted)}.caption{margin:52px 12px 18px}nav{display:grid;gap:7px}nav a{text-decoration:none;font-size:14px;padding:13px;border-radius:9px}nav a.active{background:#eaf1e4;color:var(--green);font-weight:700}.side-note{margin-top:auto;padding:24px 12px 0}.side-note p{font-size:13px;color:var(--muted)}small{font-size:12px;line-height:1.6;color:var(--muted)}.pill{display:inline-block;font-size:10px;letter-spacing:1px;font-weight:700;padding:6px 9px;border-radius:5px;background:#edf3e6;color:var(--green)}main{max-width:1280px;width:100%;padding:38px 5% 60px;margin:auto}.topline{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px;color:var(--muted);font-size:13px}.avatar{display:grid;place-items:center;width:35px;height:35px;border-radius:50%;background:#e1e9d8;font-weight:700;color:var(--green)}.hero{background:var(--green);color:#fff;border-radius:20px;padding:38px;position:relative;overflow:hidden}.hero .eyebrow{color:var(--lime)}.hero p{color:#d0ded1;max-width:550px}.hero .button{background:var(--lime);color:#173a2d}.hero:after{content:'{ }';font-size:180px;font-weight:800;color:#ffffff09;position:absolute;right:25px;top:30px;pointer-events:none}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:23px 0 33px}.stat,.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px}.stat strong{font-size:29px;display:block;margin:8px 0}.stat span{font-size:13px;color:var(--muted)}.section-top{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:25px}.section-top a{font-size:13px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.card h3{margin:13px 0 8px}.card p{font-size:14px;color:var(--muted);margin:6px 0 17px}.course-icon{font-family:monospace;font-size:21px;background:#edf3e6;width:43px;height:43px;border-radius:11px;display:grid;place-items:center}.course-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.progress{height:6px;background:#edf0e9;border-radius:6px;overflow:hidden;margin:17px 0 9px}.progress i{display:block;height:100%;background:#6c9565;border-radius:6px}.meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}.card-link{display:block;text-decoration:none;transition:transform .15s}.card-link:hover{transform:translateY(-3px);border-color:#7b9b71}.weekly{margin-top:24px;background:#edf2e7;padding:22px 25px;border-radius:14px;display:flex;gap:18px;align-items:center}.weekly p{font-size:14px;margin:5px 0;color:var(--muted)}.lesson-list{display:grid;gap:12px}.lesson-row{display:flex;align-items:center;gap:17px;text-decoration:none;padding:20px;background:white;border:1px solid var(--line);border-radius:12px}.lesson-row .number{width:39px;height:39px;border-radius:50%;background:#edf3e6;display:grid;place-items:center;flex-shrink:0}.lesson-row strong{display:block}.lesson-row small{display:block;margin-top:6px}.lesson-row .arrow{margin-left:auto}.back{display:inline-block;margin-bottom:20px;text-decoration:none;color:var(--muted);font-size:14px}.reading{max-width:800px;margin:auto}.reading .card{margin:20px 0;padding:30px}.reading h2{margin-top:27px}.reading p,.reading li{line-height:1.8}.reading li{margin:8px 0}pre{background:#15352f;color:#e0eeca;padding:22px;border-radius:11px;overflow:auto;line-height:1.7;font-size:14px;white-space:pre-wrap}code{font-family:Consolas,monospace}.callout{padding:18px 22px;background:#edf3e6;border-left:4px solid #8eae6c;border-radius:4px}.question{padding:20px 0;border-bottom:1px solid var(--line)}.question:last-child{border:0}.question legend{font-weight:600;line-height:1.6;margin-bottom:12px}fieldset{border:0;margin:0;min-width:0}label.option{display:flex;gap:12px;align-items:flex-start;padding:13px;margin:8px 0;border:1px solid var(--line);border-radius:9px;cursor:pointer}label.option:has(input:checked){background:#edf3e6;border-color:#8ca17f}.feedback{padding:14px;border-radius:8px;margin:10px 0;line-height:1.65;font-size:14px}.correct{background:#e7f2df}.incorrect{background:#fff0e7;color:#784324}.actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:22px}.tag{color:var(--muted);font-size:12px}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.tabs button.selected{background:var(--green);color:white}.tabs button{background:#e8eee2;color:var(--ink);font-size:13px}.empty{padding:45px 20px;text-align:center}.empty p{color:var(--muted)}input[type=text],textarea,select{padding:12px;border:1px solid #b8c9b6;border-radius:8px;background:#fff;color:var(--ink);max-width:100%}input[type=text]{width:100%}textarea{width:100%;min-height:110px}input[type=radio]{accent-color:var(--green);margin-top:4px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#183c36;color:white;padding:14px 22px;border-radius:10px;display:none;z-index:10}.notice{font-size:13px;color:var(--muted);line-height:1.65;margin-top:20px}.resource{display:block;margin:12px 0}.result-score{font-size:40px;font-weight:800}.checklist label{display:block;margin:15px 0;line-height:1.7}.danger{color:#9d3f28;background:#fff0e7}.footer{margin-top:40px;font-size:12px;color:var(--muted)}@media(min-width:1400px){.grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:850px){.shell{grid-template-columns:1fr}aside{height:auto;position:static;padding:18px 20px;border-bottom:1px solid var(--line)}.caption,.side-note{display:none}nav{display:flex;flex-wrap:wrap;gap:3px;margin-top:15px}nav a{font-size:12px;padding:9px}.brand{font-size:19px}main{padding:24px 5%}.hero{padding:27px}.hero:after{display:none}.stats{gap:9px}.stat{padding:15px}.stat strong{font-size:23px}.grid{gap:12px}}@media(max-width:540px){.grid{grid-template-columns:1fr}.topline{margin-bottom:20px}.stat span{font-size:11px}.stat{padding:13px 10px}.reading .card{padding:20px}.weekly{align-items:flex-start}.section-top{align-items:baseline}h1{letter-spacing:-1px}}

.simple{border-top:5px solid #8eae6c}.big-idea{font-size:21px;font-weight:700;line-height:1.5;color:var(--green);margin:12px 0 4px}.simple h3{margin:26px 0 8px}.full-head{margin-top:36px}.viz{margin:14px 0;overflow-x:auto}.flow{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:8px 0}.viz .box{background:#f3f7ee;border:2px solid #b9cfa6;border-radius:10px;padding:12px 14px;text-align:center;line-height:1.45;min-width:90px}.viz .box small{display:block;color:var(--muted)}.viz .box strong{font-size:22px}.viz .box.yes{border-color:#6c9565;background:#e7f2df}.viz .box.no{border-color:#d29a78;background:#fff0e7}.viz .box.ghost{visibility:hidden}.viz .box.on{background:var(--lime);border-color:#6c9565}.flow .arrow{font-size:22px;color:var(--muted)}.boxes{display:flex;gap:10px;flex-wrap:wrap}.viz-caption{margin:4px 0 0}.scale{display:flex;align-items:center;gap:10px}.scale .pan{flex:1;background:#f3f7ee;border-bottom:4px solid var(--green);padding:14px;text-align:center;border-radius:8px 8px 0 0}.scale .eq{font-size:30px;font-weight:800}.truth{border-collapse:collapse}.truth th,.truth td{border:1px solid var(--line);padding:8px 14px;text-align:center}.truth th{background:#edf3e6}.venn{position:relative;height:170px;max-width:340px}.venn .circle{position:absolute;top:0;width:170px;height:170px;border-radius:50%;padding:58px 18px;font-size:14px;line-height:1.5}.venn .a{left:0;background:#d6edac99}.venn .b{left:110px;background:#f2c8a899;text-align:right}.venn .mid{position:absolute;left:142px;top:62px;font-size:13px;font-weight:700;text-align:center}.tiny-steps li{padding-left:4px}.words{display:grid;gap:8px;margin:0}.words div{display:grid;grid-template-columns:170px 1fr;gap:12px;padding:10px 12px;background:#f7f9f4;border-radius:8px}.words dt{font-weight:700}.words dd{margin:0}.self-check{background:#fff8ea;border-radius:8px;padding:12px 16px}@media(max-width:540px){.words div{grid-template-columns:1fr;gap:2px}}
.reading .card p,.reading .card li{font-size:16px;color:var(--ink)}.simple .big-idea{font-size:21px;color:var(--green);font-weight:700;line-height:1.5}.simple .self-check{font-size:15px}

.py-status{font-size:13px;color:var(--muted);margin:6px 0 16px}.py-status.ready{color:#3c7a3a}
.lab{display:grid;grid-template-columns:230px 1fr;gap:22px;align-items:start}.ex-list{display:grid;gap:6px;position:sticky;top:20px}.ex-list a{display:grid;grid-template-columns:28px 1fr;align-items:center;text-decoration:none;padding:9px 10px;border-radius:9px;font-size:14px;font-weight:600;background:#fff;border:1px solid var(--line)}.ex-list a span{grid-row:span 2;width:22px;height:22px;border-radius:50%;background:#edf3e6;display:grid;place-items:center;font-size:11px}.ex-list a small{font-weight:400;font-size:11px}.ex-list a.selected{background:var(--green);color:#fff;border-color:var(--green)}.ex-list a.selected small{color:#cfe0cf}.ex-list a.selected span{background:var(--lime);color:var(--green)}
.lab-main .card{margin-bottom:14px}.lab-main .card p{font-size:16px;color:var(--ink)}textarea.code{font-family:Consolas,Menlo,monospace;font-size:15px;line-height:1.6;min-height:230px;background:#15352f;color:#e0eeca;border:0;border-radius:11px;padding:16px;tab-size:4;white-space:pre;margin-top:6px}textarea.code.small{min-height:70px}.inputs{margin:12px 0}.inputs summary{cursor:pointer;font-size:14px;color:var(--muted)}
.terminal{background:#0f2420;color:#d9ecd0;font-family:Consolas,Menlo,monospace;padding:14px 16px;border-radius:10px;white-space:pre-wrap;margin-top:16px;font-size:14px;line-height:1.6}.terminal .tag{color:#8fae86}.err-line{margin:8px 0;padding:10px 14px}.compare{display:grid;grid-template-columns:1fr 1fr;gap:12px}.compare pre{margin:4px 0;padding:10px 12px;min-height:40px}
.drill-grid{margin-top:20px}.drill-top{display:flex;justify-content:space-between;align-items:center}.streak{font-weight:700}.drill-question{font-size:26px;line-height:1.4}.reading .card .drill-question code{font-size:26px}
.widget{background:#f7f9f4;border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:8px 0 20px}.switches{display:flex;gap:8px;flex-wrap:wrap}.switch{background:#fff;color:var(--ink);border:2px solid #b9cfa6;min-width:62px;display:grid;gap:2px;padding:8px 12px}.switch small{color:var(--muted);font-weight:400}.switch b{font-size:22px}.switch.on{background:var(--lime);border-color:#6c9565}.w-read{font-size:18px}.lamps{display:flex;gap:12px;flex-wrap:wrap;margin-top:12px}.lamp{display:flex;align-items:center;gap:8px;padding:10px 14px;background:#fff;border:1px solid var(--line);border-radius:10px;font-weight:600}.lamp i{width:18px;height:18px;border-radius:50%;background:#d7dcd4}.lamp.on i{background:#f2c230;box-shadow:0 0 12px #f2c230}
.widget label{display:block;margin:8px 0}.widget input[type=range]{width:100%;accent-color:var(--green)}.hose{height:16px;background:#e3e9df;border-radius:8px;overflow:hidden;margin:12px 0}.hose i{display:block;height:100%;background:linear-gradient(90deg,#6aa9d6,#2f7fbf);transition:width .2s}
.practice-this{border-top:5px solid var(--orange)}.practice-cards{margin:-12px 0 28px}
@media(max-width:850px){.lab{grid-template-columns:1fr}.ex-list{position:static;grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}.compare{grid-template-columns:1fr}}

.live-ok{background:#f1f5ec;color:var(--muted)}details.more{margin:20px 0}details.more>summary{cursor:pointer;font-weight:600;padding:14px 18px;background:#fff;border:1px solid var(--line);border-radius:12px}.simple .big-idea{margin-top:0}