:root{--bg:#f6f6f0;--surface:#fff;--surface-soft:#f1f3ed;--ink:#182c26;--muted:#69776d;--line:#dde4d9;--green:#153f35;--green-hover:#235647;--mint:#d7f29b;--accent:#789947;--amber:#91613c;--radius:18px;--shadow:0 14px 42px #153f3510;color-scheme:light}
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var(--line);border-radius:var(--radius);padding:25px;grid-column:span 1}.project-card .eyebrow{font-size:9px}.project-card h3{font-family:'DM Serif Display',Georgia,serif;font-size:23px;font-weight:400;margin-bottom:10px}.project-card p{font-size:11px}.project-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:17px}.analysis-strip{margin-top:22px;border-radius:var(--radius);background:var(--surface-soft);padding:24px;display:flex;gap:28px;align-items:center}.analysis-strip .intro{flex:0 0 200px}.analysis-strip h3{font-size:15px;margin-bottom:5px}.analysis-strip p{font-size:10px}.analysis-flow{display:flex;gap:13px;align-items:center;flex:1;justify-content:space-between}.analysis-flow>div{font-size:10px;color:var(--muted)}.analysis-flow 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var(--line);border-radius:var(--radius);padding:30px;font-size:13px;line-height:1.9;overflow-wrap:anywhere}.reference-content .source-list li{margin:20px 0}.reference-content .text-small{display:block;margin-top:8px}.reference-content>details{border:0;margin:0;padding:0}.reference-content>details>summary{display:none}.toast{position:fixed;bottom:28px;left:calc(50% + 122px);transform:translateX(-50%);z-index:100;background:var(--green);color:var(--mint);padding:14px 22px;border-radius:12px;box-shadow:var(--shadow);font-size:12px;max-width:calc(100% - 40px)}dialog{border:1px solid var(--line);border-radius:20px;background:var(--surface);color:var(--ink);padding:28px;width:min(620px,calc(100% - 32px));max-height:90vh;overflow:auto;box-shadow:0 20px 80px #0003}dialog::backdrop{background:#172c2666;backdrop-filter:blur(4px)}.dialog-heading{display:flex;justify-content:space-between;align-items:start;margin-bottom:25px}.dialog-heading h2{font-size:32px}.dialog-heading .eyebrow{font-size:9px}dialog label{display:block;font-size:11px;font-weight:500;margin-bottom:17px}dialog input,dialog textarea,dialog select{width:100%;display:block;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);padding:11px 12px;margin-top:6px;font-size:12px}dialog textarea{resize:vertical}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.dialog-actions{display:flex;justify-content:end;gap:10px;margin-top:25px}.form-hint{font-size:10px}.mobile-overlay{position:fixed;inset:0;background:#10251c66;z-index:45}.source-list{padding-left:22px}body.dark{--bg:#14241e;--surface:#1c3027;--surface-soft:#233b30;--ink:#ecf1e8;--muted:#acbcb0;--line:#365044;--green:#c9e59b;--green-hover:#d9efb4;--mint:#153f35;--accent:#bad68d;--amber:#e0b583;color-scheme:dark}.dark .hero{background:#244c3c}.dark .hero h1 em{color:#d7f29b}.dark .hero .button.mint{background:#d7f29b}.dark .bar-fill.baseline{background:#587968}.dark .pill.green{color:var(--ink)}.dark .result-message .result-tag{color:var(--amber)}.dark .hero-art .diagram-active{fill:#d7f29b}.dark .hero-art .diagram-node{fill:#285240}
@media(min-width:1550px){main{padding-top:46px}.hero{min-height:370px}}
@media(max-width:1180px){.sidebar{width:215px;padding-inline:14px}.main-shell{margin-left:215px}main{padding:28px}.topbar{padding:0 28px}.lesson-layout{grid-template-columns:minmax(0,1fr) 220px;gap:16px}.hero{padding:30px;gap:15px}.hero h1{font-size:43px}.chapter-card{padding:20px}.analysis-strip{align-items:start;flex-direction:column;gap:20px}.analysis-strip .intro{flex:auto}.analysis-flow{width:100%}.toast{left:calc(50% + 107px)}}
@media(max-width:980px){.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:1fr}.lesson-aside{grid-template-columns:1fr 1fr}.lesson-aside .plan-note{grid-column:1/-1}.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h1{max-width:500px}.hero p{max-width:480px}.lab-layout{grid-template-columns:1fr}.page-heading{align-items:start}.research-hero{grid-template-columns:1fr}.matrix-guide{grid-template-columns:1fr;gap:20px}}
@media(max-width:720px){.sidebar{width:244px;transform:translateX(-100%);transition:transform .2s}.sidebar.open{transform:translateX(0)}.main-shell{margin-left:0}.mobile-menu{display:grid}.topbar{height:65px;padding:0 20px}.topbar-left{gap:10px}#breadcrumb{font-size:10px}.save-status{display:none}main{padding:25px 20px 40px}.page-heading{flex-direction:column;gap:16px;margin-bottom:20px}.page-heading h2{font-size:31px}.phase-switch button{padding:7px 13px}.hero{padding:28px;min-height:0;border-radius:18px}.hero h1{font-size:42px}.chapter-grid{gap:12px}.chapter-card{padding:18px;min-height:217px}.chapter-card h3{font-size:15px}.chapter-card-top{margin-bottom:17px}.project-card{padding:18px}.analysis-flow{display:grid;grid-template-columns:1fr;gap:10px}.flow-arrow{transform:rotate(90deg);justify-self:start;margin-left:20px}.analysis-flow>div{padding:8px 0}.lesson-tabs{gap:24px;padding:0 20px}.lesson-body{padding:20px}.handoff{grid-template-columns:1fr;gap:13px}.handoff>div+div{border-left:0;border-top:1px solid var(--line);padding:12px 0 0}.lesson-heading h1{font-size:33px}.lesson-aside{grid-template-columns:1fr}.lesson-bottom{padding:18px;flex-wrap:wrap}.lesson-body .table th,.lesson-body .table td{padding:12px 8px}.lesson-body .table{font-size:11px}.evidence-toolbar{align-items:start;padding:20px}.evidence-toolbar .button{padding:10px 12px;flex-shrink:0}.tool-card{padding:21px}.lab-chart-card,.lab-control-card{padding:22px}.toast{left:50%}.footer{padding:20px;gap:20px}.form-grid{grid-template-columns:1fr;gap:0}dialog input,dialog textarea,dialog select,.draft-area{font-size:16px}.reference-content{padding:22px}.draft-intro{flex-direction:column}.draft-actions .button{flex-grow:1}.lab-control-card input[type=range]{min-height:30px}.icon-button{min-width:38px;min-height:38px}}
@media(max-width:390px){.chapter-grid{grid-template-columns:1fr}.hero h1{font-size:37px}.hero{padding:25px}.hero-actions{gap:9px}.section-heading h2{font-size:25px}.lesson-tabs{gap:19px}.lesson-tabs button{font-size:11px}.page-heading h2{font-size:29px}.time-comparison .time-value{font-size:33px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,.footer,.lesson-tabs,.lesson-aside,.lesson-bottom,.toast,.draft-actions,.button{display:none!important}.main-shell{margin:0}main{padding:0}.lesson-layout{display:block}.lesson-panel{border:0}.lesson-body{padding:0}body{background:#fff;color:#000}}

/* Readability refinements: preserve hierarchy with stronger supporting text. */
:root{--muted:#4f6256}
body.dark{--muted:#b8cbbd}
.nav-item{font-size:14px;font-weight:600;color:var(--ink)}
.chapter-nav-title{line-height:1.4}
.chapter-nav-title small{font-size:10px;font-weight:600;color:var(--muted);opacity:1}
.nav-item.active .chapter-nav-title small{color:inherit;opacity:.9}
.sidebar-label{font-size:10px;color:var(--ink)}
.brand-sub{font-size:10px;font-weight:600}
.chapter-number{font-size:11px;font-weight:600}
.sidebar-progress{font-size:12px}
.sidebar-bottom p{font-size:12px;font-weight:500}
.sidebar-download{font-size:13px;font-weight:600}
.page-heading p{font-size:14px;font-weight:500;color:var(--ink)}
.hero p{font-size:14px;font-weight:500;color:#dce9df;line-height:1.8}
.chapter-card p,.project-card p{font-size:13px;font-weight:500;color:var(--ink);line-height:1.8}
.chapter-card h3{font-size:18px;font-weight:700}
.pill{font-size:11px;font-weight:600}
.card-bottom{font-size:12px;font-weight:500}
.section-heading .meta{font-size:12px;font-weight:500}
.analysis-strip h3{font-size:16px}
.analysis-strip p,.analysis-flow>div{font-size:12px;font-weight:500}
.analysis-flow strong{font-size:13px;font-weight:700}
.note-banner{font-size:12px}
.lesson-body .table{font-size:13px}
.lesson-body .table th{font-size:12px}
.lesson-body .section,.lesson-body ul{font-size:13px}
.hero-art .diagram-caption{font-size:9px;font-weight:600;fill:#bcd2c4}
.hero-art .diagram-caption-active{fill:#36542d}
.hero-art .diagram-label{font-size:14px;font-weight:600;fill:#eff7f0}
.hero-art .diagram-label-active{font-weight:700;fill:#153f35}
@media(max-width:720px){
  .chapter-card h3{font-size:17px}
  .lesson-body .table{font-size:12px}
  .lesson-body .table th{font-size:11px}
  .analysis-flow>div{padding:8px 0}
}

/* Give every research stage its own readable colour. */
.hero-art .diagram-step:nth-of-type(1)>rect{fill:#b9dcf5;stroke:none}
.hero-art .diagram-step:nth-of-type(2)>rect{fill:#d7f29b;stroke:none}
.hero-art .diagram-step:nth-of-type(3)>rect{fill:#d4c2f5;stroke:none}
.hero-art .diagram-step:nth-of-type(4)>rect{fill:#f7caa4;stroke:none}
.hero-art .diagram-step:nth-of-type(5)>rect{fill:#f5bdce;stroke:none}
.hero-art .diagram-step:nth-of-type(6)>rect{fill:#a5dfd2;stroke:none}
.hero-art .diagram-step .diagram-caption{fill:#254135}
.hero-art .diagram-step .diagram-label{fill:#153f35;font-weight:700}