/* Shared text roles across the five learning workspaces. */
:root{--atlas-font:'Segoe UI',Arial,sans-serif;--atlas-text:#20272f;--atlas-prose:#344351;--atlas-explanation:#344b5d;--atlas-muted:#59626c;--atlas-link:#185683;--atlas-heading:25px;--atlas-reader:16px}
body,button,input,select,textarea{font-family:var(--atlas-font)}
body{color:var(--atlas-text);font-synthesis:none}
body[data-instrument]{--ink:var(--atlas-text);--muted:var(--atlas-muted);--paper:#f3f3f1}
:is(.intro,.od-intro,.iw-heading) h1{font-size:32px;line-height:1.3;font-weight:700;letter-spacing:-.6px}
:is(.chapter-head,.od-topic-head,.iw-topic-head) h2{font-size:var(--atlas-heading);line-height:1.35;font-weight:700;letter-spacing:-.35px}
.chapter-summary>p,.od-topic-summary>p,.iw-topic-head>p:last-child{font-size:16px;line-height:1.65;font-weight:400;color:var(--atlas-prose);max-width:100ch}
/* Main-page prose has one role, independent of the underlying diagram. */
.experiment-explanation,.iw-explanation,.iw-component-description,.part-inspector p{font-size:14px;line-height:1.75;font-weight:400;color:var(--atlas-explanation)}
.iw-explanation strong,.iw-component-description strong{font-weight:700}
#reader .reader-body,#optical-reader .od-reader-body,#iw-reader .iw-reader-body{font-size:var(--atlas-reader);line-height:1.8;color:var(--atlas-text)}
#reader .reader-body p,#optical-reader .od-reader-body p,.iw-reader-body p{line-height:inherit}
#reader .reading-section>h3,#optical-reader .od-reading-section>h3,#iw-reader .iw-reading-section>h3{font-size:22px;line-height:1.4;font-weight:700;color:var(--atlas-text)}
#reader .reading-section h4,#optical-reader .od-reading-section h4,#iw-reader .iw-reading-section h4{font-size:16px;line-height:1.5;font-weight:700;color:var(--atlas-text)}
.iw-reader-head h2,.od-reader-head h2{font-size:24px;line-height:1.4;font-weight:700}
.iw-spec-values{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px 18px;padding:12px 0;margin:14px 0;border-block:1px solid #d4dce3}
.iw-spec-values dt{font-size:13px;color:var(--atlas-muted)}
.iw-spec-values dd{margin:3px 0 0;font-size:17px;font-weight:700;font-variant-numeric:tabular-nums}
:is(.reading-tools,.od-topic-tools,.iw-topic-tools)>button{font-size:13px;font-weight:600;line-height:1.4;min-height:38px;padding:8px 12px}
.iw-metrics dd,.od-metric strong{font-size:23px;font-weight:700;line-height:1.3;font-variant-numeric:tabular-nums}
.iw-metrics dt,.od-metric dt{font-size:13px;font-weight:600;line-height:1.5}
.iw-metrics dd small,.od-metric .od-unit{font-size:13px;font-weight:600}
.iw-metrics p,.od-metric small{font-size:12px;line-height:1.5;font-weight:400;color:var(--atlas-muted)}
.iw-metrics dt{color:var(--atlas-prose)}
.iw-metrics dd,.od-metric strong,.od-metric .od-unit{color:var(--atlas-text)}
.iw-term,.iw-reader-body .iw-term{color:var(--atlas-link);font-weight:700}
#reader .reader-body>.reading-opening,#optical-reader .od-reader-flow>.reading-opening,#iw-reader .iw-reader-body>p:first-child{color:var(--atlas-prose);font-size:var(--atlas-reader);font-weight:400;line-height:1.8}
/* A concept index is the same reading aid in every workspace. */
#reader .glossary-list strong,#optical-reader .reader-concept-list strong,#iw-reader .iw-glossary-entry h3{font-size:16px;font-weight:700;line-height:1.5;color:var(--atlas-link)}
#reader .glossary-list span,#optical-reader .reader-concept-list span,#iw-reader .iw-glossary-entry p{font-size:14px;font-weight:400;line-height:1.65;color:var(--atlas-prose)}
#reader .glossary-list small,#optical-reader .reader-concept-list small,#iw-reader .iw-glossary-entry small{font-size:12px;font-weight:400;line-height:1.5;color:var(--atlas-muted);text-transform:none;letter-spacing:normal}
.iw-figure svg text,.iw-reader-body svg text,.od-figure svg text,.od-reader-body svg text{font-family:var(--atlas-font)}
.iw-control-label,.od-control-heading{font-size:13px;font-weight:600}
.iw-control-label output,.od-control-heading>span{font-size:13px;color:var(--atlas-text);font-variant-numeric:tabular-nums}
.control select,.od-control select,.iw-control select{font-size:13px;font-weight:400;line-height:1.45;color:var(--atlas-text)}
:is(.lesson-footer,.od-lesson-footer,.iw-footer-nav) button{font-size:13px;font-weight:600;line-height:1.4}
/* An outline navigates within a reading; it uses compact links in every reader. */
:is(#reader,#optical-reader,#iw-reader) :is(.reader-body,.od-reader-flow,.iw-reader-body) .reader-contents{margin:14px 0 20px;padding:9px 0;border-block:1px solid #d4dce3}
:is(#reader,#optical-reader,#iw-reader) :is(.reader-body,.od-reader-flow,.iw-reader-body) .reader-contents>summary{font-size:14px;font-weight:600;line-height:1.6;color:#315b78;cursor:pointer}
:is(#reader,#optical-reader,#iw-reader) .reader-contents>:is(.reader-index,.od-reader-outline){display:flex;flex-wrap:wrap;gap:4px 18px;margin:10px 0 0;padding:0;border:0;background:none}
:is(#reader,#optical-reader,#iw-reader) .reader-contents>:is(.reader-index,.od-reader-outline)>button{display:inline;flex:0 1 auto;min-width:0;min-height:36px;width:auto;padding:2px 0;border:0;border-radius:0;background:none;color:#315b78;font-family:var(--atlas-font);font-size:13px;font-weight:600;line-height:1.65;text-align:left;text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}
:is(#reader,#optical-reader,#iw-reader) .reader-contents>:is(.reader-index,.od-reader-outline)>button:hover{color:#0865cf;text-decoration-thickness:2px}
:is(#reader,#optical-reader,#iw-reader) .reader-contents>:is(.reader-index,.od-reader-outline)>button[aria-current=true]{color:#0865cf;font-weight:700}
@media(max-width:760px){
 :root{--atlas-heading:23px;--atlas-reader:15px}
 :is(.intro,.od-intro,.iw-heading) h1{font-size:28px}
 .chapter-summary>p,.od-topic-summary>p,.iw-topic-head>p:last-child{font-size:15px}
 #reader .reading-section>h3,#optical-reader .od-reading-section>h3,#iw-reader .iw-reading-section>h3{font-size:21px}
 .iw-reader-head h2,.od-reader-head h2{font-size:22px}
 .iw-metrics dd,.od-metric strong{font-size:21px}
 :is(.reading-tools,.od-topic-tools,.iw-topic-tools)>button{min-height:40px}
 :is(#reader,#optical-reader,#iw-reader) .reader-contents>:is(.reader-index,.od-reader-outline)>button{min-height:44px}
}