/* Local system fonts keep reading clear and the complete package portable. */
:root{--ink:#20352c;--muted:#506258;--green:#215b45;--green-dark:#133e2e;--pale:#edf4ed;--paper:#fff;--bg:#f7f8f2;--line:#cdd9cd;--amber:#77501b;--amber-bg:#fff6e4;--danger:#8b302e;--focus:#135ea8;--radius:16px}
*{box-sizing:border-box}html{scroll-behavior:auto}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",sans-serif;font-size:18px;line-height:1.55}a{color:var(--green);text-decoration-thickness:1.5px;text-underline-offset:3px}a:hover{color:var(--green-dark)}button,input,select,textarea{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;min-height:46px;padding:.55rem 1rem;border:1px solid var(--green);border-radius:9px;background:white;color:var(--green);font-weight:650;text-decoration:none;cursor:pointer;line-height:1.35;text-align:center;max-width:100%;white-space:normal}button:hover,.button:hover{background:var(--pale)}.primary,button.primary{background:var(--green);color:white}.primary:hover{background:var(--green-dark);color:white}button[aria-pressed="true"]{background:var(--green);color:white}button:disabled{background:#e7eae5;color:#59645d;border-color:#a4b2a7;cursor:default}.danger{border-color:var(--danger);color:var(--danger)}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}h1:focus{outline:none}h1,h2,h3{line-height:1.2;letter-spacing:-.025em}h1{font-size:clamp(2rem,4vw,3.4rem);margin:.5rem 0 1.2rem;font-weight:760}h2{font-size:1.6rem;margin:0 0 1rem}h3{font-size:1.18rem;margin:1.2rem 0 .6rem}p{margin:.4rem 0 1rem}.reading{max-width:65ch}.muted,small,.small{color:var(--muted)}small,.small{font-size:.85rem}.eyebrow{font-size:.78rem;font-weight:750;letter-spacing:.1em;text-transform:uppercase;color:var(--green);margin-bottom:.6rem}.site-header{max-width:1320px;margin:auto;padding:24px 40px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:1.1rem;font-weight:750;text-decoration:none}.brand small{display:block;font-size:.72rem;font-weight:450;letter-spacing:.02em}.brand-mark{height:48px;width:48px;display:grid;place-items:center;background:var(--green);color:white;border-radius:14px;flex:none}.site-header nav{display:flex;gap:16px;flex-wrap:wrap}.site-header nav a{display:flex;align-items:center;min-height:44px;font-size:.9rem;font-weight:600}.storage-status{max-width:1240px;margin:10px auto 0;padding:0 24px;font-size:.8rem;color:var(--muted);min-height:1.3rem}.storage-status.warning{color:var(--danger)}main{max-width:1240px;margin:0 auto;padding:24px 24px 56px;min-height:65vh}.hero{padding:40px 0 48px;display:grid;grid-template-columns:1.5fr 1fr;gap:48px;align-items:center}.hero h1{font-size:clamp(2.7rem,5vw,4.5rem);max-width:10ch}.hero p{max-width:48ch}.hero-art{padding:30px;border:1px solid var(--line);background:var(--pale);border-radius:24px;transform:rotate(-1deg)}.flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;list-style:none;padding:0;margin:20px 0}.flow li{border:1px solid var(--line);padding:14px 12px;background:white;border-radius:10px;overflow-wrap:anywhere;font-size:.85rem}.flow strong{display:block;color:var(--green);margin-bottom:5px}.hero-art .flow{grid-template-columns:1fr 1fr}.hero-art .flow li{min-height:90px}.year-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.year-card{border-top:4px solid var(--green);background:var(--paper);padding:26px;border-radius:0 0 16px 16px;box-shadow:0 3px 20px #1e422508}.year-card .year-number{font-size:3rem;font-weight:750;line-height:1.1;color:var(--green)}.year-card h2{margin:12px 0}.year-card p{font-size:1rem}.year-card a{width:100%;margin-top:10px}.intro-band{padding:28px;border:1px solid var(--line);border-radius:var(--radius);margin:32px 0;background:var(--pale)}.intro-band h2{font-size:1.3rem}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:7px;list-style:none;padding:0;font-size:.8rem;margin:0 0 20px}.breadcrumbs li+li:before{content:"›";margin-right:7px;color:var(--muted)}.lesson-title{max-width:28ch}.stage-nav{margin:24px 0 30px}.stage-nav ol{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;padding:0;list-style:none}.stage-nav a{display:flex;min-height:62px;align-items:center;gap:8px;padding:10px;border:1px solid var(--line);border-radius:9px;background:white;font-size:.88rem;text-decoration:none;font-weight:600}.stage-nav a[aria-current="step"]{background:var(--green);color:white;border-color:var(--green)}.step-number{display:grid;place-items:center;width:24px;height:24px;border:1px solid currentColor;border-radius:50%;font-size:.7rem;flex:none}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:24px;align-items:start}.panel{background:var(--paper);border:1px solid var(--line);padding:28px;border-radius:var(--radius);margin-bottom:22px;min-width:0}.panel.soft{background:var(--pale)}.help-panel{font-size:.92rem;background:#eff3e9;padding:22px}.help-panel button{width:100%}.help-panel h2{font-size:1.1rem}.help-panel ol{padding-left:22px}.help-panel li{margin:10px 0}.hint-content{margin:15px 0}.button-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:18px 0 6px}.button-row.compact{margin:8px 0}.lesson-footer{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:24px}.lesson-list{list-style:none;padding:0;display:grid;gap:12px}.lesson-list li{padding:22px;background:white;border:1px solid var(--line);border-radius:12px;display:grid;grid-template-columns:50px 1fr auto;gap:18px;align-items:center}.lesson-list h2{font-size:1.25rem;margin:0 0 6px}.lesson-list p{margin:0;font-size:.9rem}.lesson-no{font-size:1.8rem;color:var(--green);font-weight:700}.status{display:inline-flex;align-items:center;background:var(--pale);padding:3px 9px;border-radius:7px;font-size:.75rem;color:var(--green);font-weight:650}.status.warning{background:var(--amber-bg);color:var(--amber)}.mode-label{font-size:.82rem;font-weight:700;padding:10px 12px;border-left:4px solid var(--green);background:var(--pale);margin:0 0 20px}.steps{padding-left:24px;max-width:65ch}.steps li{padding:0 0 12px 5px}.result{border:1px solid #9fb6a1;border-left:5px solid var(--green);padding:20px;margin:22px 0;border-radius:9px;background:#f3f8f1}.feedback{padding:14px;background:var(--pale);border-radius:9px;margin-top:16px}.feedback.error{background:var(--amber-bg);color:#644315}.feedback:empty{display:none}.message{font-size:.9rem;color:var(--danger);margin:6px 0}.result pre,.record pre{font:inherit;white-space:pre-wrap;overflow-wrap:anywhere}.record{border-top:1px solid var(--line);padding:12px 0}.record p{margin:4px 0}.record details{margin:6px 0}.records{margin-top:24px}.table-region{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:9px;margin:16px 0;background:white}table{border-collapse:collapse;width:100%;font-size:.9rem}caption{text-align:left;padding:12px;font-weight:650;color:var(--green)}th,td{padding:12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);min-width:80px}th{background:var(--pale);font-weight:650}tbody tr:last-child td,tbody tr:last-child th{border-bottom:0}.table-region:focus-visible{outline-offset:-3px}.stacked-records article{border:1px solid var(--line);padding:12px;border-radius:8px;margin:12px 0}dl{margin:8px 0}dt{font-weight:700}dd{margin:0 0 12px}.terms{display:grid;gap:12px}.term{border-left:3px solid var(--line);padding-left:16px}.term p{font-size:.95rem;margin:5px 0}details{margin:14px 0}summary{cursor:pointer;min-height:44px;padding:9px 3px;font-weight:650;color:var(--green)}fieldset{min-width:0;margin:20px 0;padding:18px;border:1px solid var(--line);border-radius:10px}legend{font-weight:700;padding:0 6px;max-width:100%;overflow-wrap:anywhere}.choice{display:flex;align-items:center;gap:12px;min-height:48px;padding:9px 12px;border:1px solid var(--line);border-radius:8px;margin:8px 0;cursor:pointer}.choice:has(input:checked){background:var(--pale);border-color:var(--green)}input[type=radio],input[type=checkbox]{width:21px;height:21px;accent-color:var(--green);flex:none}.field{margin:18px 0;min-width:0}.field>label{display:block;font-size:.95rem;font-weight:650;margin-bottom:7px}input[type=text],input[type=number],select,textarea{width:100%;min-height:46px;border:1px solid #829889;border-radius:8px;background:white;color:var(--ink);padding:10px 12px}select{white-space:normal;text-overflow:ellipsis}textarea{resize:vertical;line-height:1.5;min-height:105px}.field .count{display:block;text-align:right;font-size:.72rem;color:var(--muted);margin-top:4px}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.field-grid .wide{grid-column:1/-1}.inline-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.inline-controls .field{margin:10px 0}.formula{font-size:1.2rem;line-height:1.7;font-weight:650;overflow-wrap:anywhere}.key-value{display:grid;grid-template-columns:1fr 1fr;gap:8px}.key-value div{padding:16px;background:var(--pale);border-radius:9px}.key-value strong{display:block;font-size:1.55rem}.dots{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.dot{display:inline-block;padding:8px;border:1px solid var(--line);border-radius:7px;font-size:.75rem}.dot.wrong{background:var(--amber-bg);border-color:#bca47e}.source-card{padding:16px;background:var(--pale);border-radius:9px;margin:12px 0}.glossary-list{display:grid;grid-template-columns:1fr 1fr;gap:18px}.glossary-list article{padding:22px;background:white;border:1px solid var(--line);border-radius:12px}.glossary-list h2{font-size:1.2rem}.glossary-list p{font-size:.95rem}.check-count{font-size:.8rem;color:var(--muted);font-weight:650}.evidence-text{font-family:ui-monospace,Consolas,monospace;font-size:.8rem;min-height:360px}.site-footer{max-width:1240px;margin:auto;padding:28px 24px 36px;border-top:1px solid var(--line);font-size:.8rem;color:var(--muted);display:flex;gap:15px;flex-wrap:wrap;justify-content:space-between}.site-footer p{flex-basis:100%;margin:0}.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-link{position:fixed;left:12px;top:-100px;padding:14px;background:white;z-index:100}.skip-link:focus{top:12px}dialog{border:1px solid var(--line);border-radius:16px;max-width:min(560px,calc(100% - 32px));padding:28px;color:var(--ink)}dialog::backdrop{background:#142b2399}.print-only{display:none}
@media(max-width:1000px){.lesson-layout{grid-template-columns:minmax(0,1fr)}.help-panel{order:-1}.help-panel .button-row button{width:auto}.hero{gap:24px}.stage-nav ol{grid-template-columns:repeat(3,1fr)}.year-grid{gap:12px}.year-card{padding:20px}}
@media(max-width:680px){.site-header{padding:16px;align-items:flex-start;flex-direction:column;gap:8px}.site-header nav{width:100%;gap:22px}.storage-status{padding:0 16px}main{padding:16px 16px 32px}.hero{padding:24px 0;grid-template-columns:1fr}.hero-art{transform:none;padding:20px}.hero-art .flow li{min-height:auto}.year-grid{grid-template-columns:1fr}.year-card{padding:24px}.year-card .year-number{font-size:2.4rem}.panel{padding:20px 16px}.lesson-list li{grid-template-columns:34px 1fr;gap:12px;padding:18px}.lesson-list .button{grid-column:2}.stage-nav a{font-size:.8rem;padding:8px;gap:6px}.stage-nav ol{gap:6px}.field-grid,.inline-controls,.glossary-list{grid-template-columns:1fr}.flow{grid-template-columns:1fr 1fr}.flow li{padding:10px}.key-value{grid-template-columns:1fr}.button-row>*{flex-grow:1}.lesson-title{font-size:2rem}.breadcrumbs{overflow-wrap:anywhere}.intro-band{padding:20px}fieldset{padding:12px}.site-footer{padding:22px 16px}h1{overflow-wrap:anywhere}.brand{font-size:1rem}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Also respond to the actual reading column when text or browser scaling narrows it. */
main{container-type:inline-size}.site-header{flex-wrap:wrap}.brand{min-width:0;max-width:100%}.brand>span:last-child{min-width:0;overflow-wrap:anywhere}.site-header nav{min-width:0;flex-wrap:wrap}.site-footer{overflow-wrap:anywhere}
@container(max-width:1000px){.lesson-layout{grid-template-columns:minmax(0,1fr)}.stage-nav ol{grid-template-columns:repeat(3,minmax(0,1fr))}.hero{gap:24px}.year-grid{gap:12px}.year-card{padding:20px}}
@container(max-width:680px){.hero,.year-grid,.field-grid,.inline-controls,.glossary-list{grid-template-columns:minmax(0,1fr)}.hero-art{transform:none;padding:18px}.panel{padding:20px 16px}.flow{grid-template-columns:repeat(2,minmax(0,1fr))}.key-value{grid-template-columns:minmax(0,1fr)}.lesson-list li{grid-template-columns:34px minmax(0,1fr);padding:18px}.lesson-list .button{grid-column:2}.stage-nav a{font-size:.8rem;padding:8px;gap:6px}.stage-nav ol{gap:6px}.lesson-title{font-size:2rem}.button-row>*{flex-grow:1}fieldset{padding:12px}.intro-band{padding:20px}}
@media print{.site-header nav,.stage-nav,.help-panel,button,.lesson-footer,.storage-status,.site-footer,.skip-link{display:none!important}body{background:white;font-size:12pt}main{padding:0;max-width:none}.panel{border:0;padding:8px;break-inside:avoid}.table-region{overflow:visible}textarea{border:1px solid #777}.print-only{display:block}.hero,.lesson-layout{display:block}a{color:black}.source-card,th{background:white}.record{break-inside:avoid}}