:root{--green:#123f35;--dark:#092a24;--gold:#e8b84e;--paper:#f5f5ee;--ink:#19362e;--muted:#5d6b65;--line:#dbe1d8;--white:#fff;--red:#922f2f;--radius:16px}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}a{color:#176151;text-underline-offset:4px}button,.button{border:1px solid transparent;border-radius:8px;background:var(--green);color:white;padding:11px 18px;cursor:pointer;font-weight:650;text-decoration:none;display:inline-block;line-height:1.45}button:hover,.button:hover{filter:brightness(1.12)}button:disabled{opacity:.5;cursor:not-allowed}button.light,.button.light{background:#edf2ec;color:var(--green);border-color:var(--line)}button.gold,.button.gold{background:var(--gold);color:var(--dark)}button.outline{background:transparent;border-color:#b6c7be;color:var(--green)}:focus-visible{outline:3px solid #ce8c10;outline-offset:4px}h1,h2,h3,h4{line-height:1.2;letter-spacing:-.025em;margin-top:0}h1{font-size:clamp(2rem,4vw,3.7rem);font-weight:650;max-width:790px}h2{font-size:1.65rem}h3{font-size:1.23rem}p{margin:0 0 1.1em}small,.small{font-size:.85rem}.muted{color:var(--muted)}.eyebrow{font-size:.72rem;font-weight:750;letter-spacing:.16em;text-transform:uppercase;color:#a87917;margin-bottom:16px}.pill{display:inline-block;border-radius:999px;padding:3px 10px;background:#e6eee7;font-size:.73rem;font-weight:650;color:#2c5548}.pill.gold{background:#fff0cc;color:#715004}.pill.red{background:#fbe9e6;color:var(--red)}.skip{position:absolute;top:-60px;z-index:100;background:white;padding:12px}.skip:focus{top:10px}#sidebar{width:260px;position:fixed;inset:0 auto 0 0;background:var(--green);color:#e6eee7;padding:30px 23px;display:flex;flex-direction:column;z-index:20;overflow:auto}.brand{display:flex;gap:13px;align-items:center;text-decoration:none;color:white;font-size:.9rem;letter-spacing:.09em;font-weight:750;line-height:1.5}.brand small{display:block;font-size:.62rem;letter-spacing:.22em;font-weight:450;color:#c1d3c9}.brand-icon{font-family:Georgia,serif;font-size:34px;background:var(--gold);color:var(--dark);border-radius:9px;width:47px;height:47px;line-height:47px;text-align:center;position:relative}.brand-icon span{font-family:system-ui;position:absolute;font-size:15px;right:1px;top:-13px}.nav-label{color:#a8c0b5;font-size:.64rem;letter-spacing:.16em;margin:48px 0 13px}nav a{display:flex;align-items:center;color:#d1dfd7;text-decoration:none;padding:11px 14px;border-radius:7px;font-size:.9rem;margin:3px 0;gap:10px}nav a.active{background:#285548;color:white;box-shadow:inset 3px 0 var(--gold)}nav a:hover{background:#285548}nav .nav-icon{width:20px;font-size:18px}.sidebar-bottom{margin-top:auto;padding-top:35px}.sidebar-bottom p{font-size:.75rem;color:#bdd0c5;line-height:1.6;margin-top:12px}.sidebar-bottom button{width:100%;font-size:.82rem}.progress-label{display:flex;justify-content:space-between;font-size:.73rem}progress{width:100%;height:6px;appearance:none;border:0;border-radius:5px;overflow:hidden;background:#477064}progress::-webkit-progress-bar{background:#477064}progress::-webkit-progress-value{background:var(--gold)}progress::-moz-progress-bar{background:var(--gold)}.shell{margin-left:260px}header{height:75px;display:flex;align-items:center;justify-content:space-between;padding:0 45px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.55)}.crumb{font-size:.8rem;font-weight:600}.save-state{font-size:.73rem;color:var(--muted)}.save-state:before{content:'●';color:#467655;margin-right:7px}#menu{display:none}main{padding:38px 45px 60px;max-width:1450px;margin:auto;min-height:75vh}footer{font-size:.73rem;color:var(--muted);padding:25px 45px;border-top:1px solid var(--line)}.hero{display:grid;grid-template-columns:1.3fr 1fr;gap:20px;padding:45px;background:var(--dark);border-radius:20px;color:white;position:relative;overflow:hidden}.hero .eyebrow{color:var(--gold)}.hero h1{font-size:clamp(2rem,3.3vw,3.3rem);margin-bottom:20px}.hero p{color:#c0d1c7;max-width:540px;font-size:.95rem}.hero-art{display:flex;align-items:center;justify-content:center}.hero-art svg{width:100%;max-width:470px}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:22px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin:22px 0 35px}.stat{padding:16px 20px;background:white;border:1px solid var(--line);border-radius:12px}.stat b{display:block;font-size:1.6rem;line-height:1.2}.stat span{font-size:.75rem;color:var(--muted)}.section-head{display:flex;justify-content:space-between;align-items:end;margin:36px 0 20px;gap:15px}.section-head h2{margin:0}.section-head p{margin:7px 0 0;color:var(--muted);font-size:.88rem}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:25px}.card p{font-size:.9rem;color:var(--muted)}.card h3{margin:15px 0 12px}.path-art{height:95px;background:#edf2e9;border-radius:9px;margin-bottom:20px;position:relative;overflow:hidden;display:flex;align-items:center;padding:12px 20px}.path-art .letter{font:italic 65px Georgia;color:#47725c}.path-art svg{position:absolute;right:15px;width:140px;height:90px}.card .card-meta{font-size:.75rem;color:var(--muted);margin:18px 0 12px}.path-link{display:flex;justify-content:space-between;font-size:.86rem;font-weight:700;text-decoration:none}.notice{background:#fff7e3;border-left:4px solid var(--gold);padding:17px 22px;border-radius:5px;margin:22px 0;font-size:.87rem}.notice p:last-child{margin:0}.intro{max-width:780px;color:var(--muted)}.module-list{display:grid;gap:12px}.module-row{background:white;border:1px solid var(--line);border-radius:12px;padding:21px 24px;display:grid;grid-template-columns:48px 1fr auto;gap:18px;align-items:center;text-decoration:none}.module-row h3{margin:0 0 7px;font-size:1.1rem}.module-row p{margin:0;color:var(--muted);font-size:.8rem}.module-code{background:#edf2e9;border-radius:9px;padding:8px;text-align:center;font-weight:750}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:30px}.lesson-body{min-width:0}.lesson-body>section{margin-bottom:24px}.lesson-body .card{padding:30px}.lesson-body h2{font-size:1.5rem}.lesson-title{font-size:clamp(2rem,3vw,2.9rem);max-width:900px;margin:12px 0 20px}.lesson-sidebar{position:sticky;top:20px;align-self:start}.lesson-sidebar a{display:block;text-decoration:none;font-size:.85rem;padding:8px 0}.lesson-sidebar .card{padding:20px}.lesson-sidebar h3{font-size:.95rem}.hook{font-size:1.17rem;color:#305443;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:20px 0 25px}.step-card{counter-increment:step;display:grid;grid-template-columns:35px 1fr;gap:14px;margin:20px 0}.step-card:before{content:counter(step,decimal-leading-zero);background:#edf2e9;color:var(--green);height:32px;width:32px;text-align:center;border-radius:50%;font-size:.75rem;font-weight:750;line-height:32px}.step-card h3{margin:3px 0 10px}.step-card p{font-size:1rem;color:var(--ink)}.step-series{counter-reset:step}.terms{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.term{padding:15px;background:#f1f5ee;border-radius:9px;font-size:.85rem}.term b{display:block;color:#27503e;margin-bottom:6px}.term p{font-size:.82rem;color:var(--muted);margin:0}.diagram{width:100%;height:auto;max-height:260px;background:#edf2e9;border-radius:12px;margin-bottom:18px}.diagram text{font-family:system-ui,sans-serif}.worked{background:#f9f2df;border:1px solid #e9dbb1;border-radius:12px;padding:24px}.worked p{color:var(--ink)}.workbook label{display:block;font-size:.86rem;font-weight:650;margin:20px 0 8px}textarea{width:100%;min-height:135px;resize:vertical;padding:14px;border:1px solid #b8c8bc;border-radius:9px;line-height:1.6;background:#fff;color:var(--ink)}input[type=number],input[type=text],select{border:1px solid #b8c8bc;border-radius:7px;padding:10px;width:100%;background:white;color:var(--ink)}.question{border:0;padding:0;margin:26px 0}.question legend{font-weight:650;margin-bottom:12px;font-size:.96rem}.option{display:flex;gap:10px;padding:10px 13px;border:1px solid var(--line);border-radius:8px;margin:7px 0;font-size:.9rem;cursor:pointer}.option:has(input:checked){background:#e9f0e7;border-color:#5c866c}.option input{accent-color:var(--green);margin-top:6px}.feedback{font-size:.88rem;padding:14px 17px;background:#edf4e9;border-radius:8px;margin:15px 0}.feedback.bad{background:#fbefeb;color:#772e29}.feedback:empty{display:none}.complete-bar{padding:24px;background:#e4eddf;border-radius:12px;margin-top:25px}.complete-bar p{font-size:.86rem}.row{display:flex;gap:15px;flex-wrap:wrap;align-items:center}.lab-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.controls{display:grid;grid-template-columns:1fr 1fr;gap:16px}.controls label{font-size:.8rem;font-weight:650;display:block}.controls input,.controls select{margin-top:7px}.metric{padding:20px;border-radius:12px;background:#eaf1e6}.metric b{font-size:1.8rem;display:block;line-height:1.2}.metric small{color:var(--muted)}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.metrics.two{grid-template-columns:repeat(2,1fr)}.lab-output{margin-top:20px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:.85rem;margin:18px 0}th,td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--line);vertical-align:top}th{background:#eaf0e5;font-weight:650}td p{margin:0}details{border:1px solid var(--line);border-radius:10px;margin:18px 0;background:#fff}summary{padding:16px 20px;font-weight:650;cursor:pointer;font-size:.9rem}details>div{padding:0 22px 20px}details p,details li{font-size:.9rem}.markdown h3{margin-top:28px}.markdown p{color:var(--ink)}.markdown li{margin-bottom:10px}.scenario-option{display:block;width:100%;text-align:left;margin:10px 0;background:#f2f5ed;color:var(--ink);border:1px solid var(--line);font-size:.9rem}.scenario-log{font-size:.8rem;color:var(--muted);border-left:2px solid var(--line);padding-left:18px}.scenario-log p{margin:8px 0}.tank-wrap{display:flex;gap:25px;align-items:center}.tank{height:220px;width:140px;border:5px solid #496e5e;border-top:0;border-radius:0 0 12px 12px;position:relative;overflow:hidden;background:#f8fbf7}.tank-water{position:absolute;bottom:0;left:0;right:0;background:#75bbb3;transition:height .4s}.tank-mark{position:absolute;bottom:83.333%;border-top:2px dashed #9e443a;width:100%;z-index:2;font-size:.7rem;text-align:center}.source{font-size:.77rem!important;color:var(--muted)!important}.workbook-list .card{margin-bottom:16px}.empty{padding:45px;text-align:center;background:white;border:1px dashed #bccabb;border-radius:15px}.search{max-width:420px;margin:20px 0}.resource-tag{font-size:.7rem;letter-spacing:.04em;text-transform:uppercase;font-weight:700;color:#326c52}.source-list li{margin:16px 0;font-size:.9rem}#toast{position:fixed;bottom:25px;right:25px;background:var(--dark);color:white;padding:13px 20px;border-radius:9px;max-width:370px;z-index:100;opacity:0;pointer-events:none;transition:opacity .2s}#toast.show{opacity:1}.error{color:var(--red)}.chart-bar{height:12px;border-radius:5px;background:#c8d9c6;margin:8px 0;overflow:hidden}.chart-bar span{display:block;background:#46795d;height:100%}.gridmap{width:100%;height:auto;background:#eaf0e4;border-radius:12px}.gridmap text{font-family:system-ui,sans-serif}.target-list button{margin:5px}.print-only{display:none}@media(max-width:1150px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}#sidebar{width:225px;padding:25px 17px}.shell{margin-left:225px}main{padding:30px}header{padding:0 30px}.hero{padding:30px;grid-template-columns:1.4fr 1fr}.lesson-layout{grid-template-columns:1fr}.lesson-sidebar{position:static;order:-1}.lesson-sidebar .card{display:flex;gap:15px;flex-wrap:wrap;align-items:center}.lesson-sidebar h3{margin:0}.lesson-sidebar .small,.lesson-sidebar .actions{display:none}}@media(max-width:800px){#sidebar{transform:translateX(-100%);transition:transform .2s;width:260px}body.menu-open #sidebar{transform:translateX(0);box-shadow:10px 0 40px #0004}.shell{margin-left:0}#menu{display:block;background:transparent;color:var(--green);font-size:20px;padding:5px 12px}header{height:64px;padding:0 20px;gap:10px}.save-state{font-size:.65rem}.crumb{margin-right:auto}main{padding:25px 20px}.hero{grid-template-columns:1fr;padding:30px}.hero-art{display:none}.stats{grid-template-columns:repeat(2,1fr);gap:10px}.lab-grid{grid-template-columns:1fr}.terms{grid-template-columns:1fr}.lesson-body .card{padding:22px}.module-row{grid-template-columns:40px 1fr;gap:12px}.module-row>.pill{grid-column:2}.metrics{grid-template-columns:repeat(3,1fr)}.metric{padding:12px}.metric b{font-size:1.4rem}footer{padding:25px 20px}}@media(max-width:520px){.grid,.grid.two{grid-template-columns:1fr}.controls{grid-template-columns:1fr 1fr}.hero h1{font-size:2.3rem}.section-head{align-items:start;flex-direction:column}.lesson-title{font-size:2rem}.lesson-sidebar .card{gap:8px;padding:12px}.lesson-sidebar a{font-size:.75rem}.card{padding:22px}.metrics{grid-template-columns:1fr}.metrics.two{grid-template-columns:1fr 1fr}.save-state{max-width:120px}.controls input{max-width:100%}}@media print{#sidebar,header,footer,button,.actions,.lesson-sidebar,.no-print{display:none!important}.shell{margin:0}main{padding:0;max-width:none}.card,.worked,.notice{break-inside:avoid;border:1px solid #ccc;background:white!important;color:black!important}.print-only{display:block}body{font-size:11pt;background:white}.grid{display:block}a{color:black}textarea{border:0;min-height:0}details{display:block}.hero{background:white;color:black}.hero p{color:black}}