/* Reading surface: Rheon's paper, ink, teal; linear print remains intact. */
[hidden]{display:none!important}
@media screen{
html{scroll-behavior:auto;scroll-padding-top:84px}body{--viewport:#e9f1ee;font-size:16px;line-height:1.75}
header.hero{padding:24px 32px 20px;position:relative}.hero h1{font:32px/1.15 Georgia,serif;margin:8px 0 14px;max-width:900px}.hero .eyebrow{font-size:10px;letter-spacing:.16em}
.book-downloads{font-size:12px;color:var(--muted)}.book-downloads summary{cursor:pointer;width:fit-content}.book-downloads nav{margin:12px 0 0;gap:16px}
.layout{max-width:1780px;grid-template-columns:192px minmax(0,650px);gap:36px;padding:28px 28px 80px;justify-content:center}body.research-book .layout{grid-template-columns:190px minmax(0,640px) minmax(350px,1fr);gap:32px}
main{max-width:650px;width:100%;font-size:16px}main>h1{font:32px/1.18 Georgia,serif;margin-top:72px;padding-top:32px;scroll-margin-top:20px}main>h1:first-child{margin-top:0}main h2{font:25px/1.25 Georgia,serif}main p{max-width:70ch}
.toc{top:24px;max-height:calc(100dvh - 48px);padding-right:10px;font-size:12px;line-height:1.4}.toc strong{font-size:10px;letter-spacing:.15em;display:block;margin:0 0 16px}.toc ul{padding:0;margin:0;list-style:none}.toc>ul>li>ul{display:none}.toc li{margin:0}.toc a{display:block;padding:7px 9px;border-left:2px solid transparent;border-radius:0 3px 3px 0}.toc a[aria-current=location]{border-left-color:var(--accent);background:var(--viewport);color:var(--ink)}
.book-toolbar{display:none;position:sticky;top:0;z-index:50;background:var(--paper);border-bottom:1px solid var(--rule);padding:8px 12px;gap:12px;align-items:center}.book-toolbar button{border:1px solid var(--rule);background:white;border-radius:4px;padding:8px 10px;font-size:12px;color:var(--accent);min-height:40px}#reading-chapter{min-width:0;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:12px}
.example-dock{align-self:start;position:sticky;top:20px;background:white;border:1px solid var(--rule);border-radius:6px;height:calc(100dvh - 40px);max-height:1080px;display:flex;flex-direction:column;overflow:hidden;min-width:0}.dock-heading{display:flex;align-items:center;gap:12px;padding:14px 16px 10px;border-bottom:1px solid var(--rule)}.dock-heading>div{min-width:0;flex:1}.dock-heading .eyebrow{color:var(--accent);font-size:10px}.dock-heading h2{font:20px/1.22 Georgia,serif;margin:4px 0 0}.dock-heading button{font-size:24px;line-height:1;background:transparent;border:0;padding:8px;color:var(--muted)}
.dock-follow{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 16px;background:var(--paper);font-size:11px;color:var(--muted)}.dock-follow button{border:1px solid var(--rule);background:white;border-radius:3px;padding:5px 8px;font-size:11px;white-space:nowrap;color:var(--accent)}#reading-example-host{flex:1;min-height:0}.reading-example-frame{width:100%;height:100%;display:block;border:0}#open-laboratory{border-top:1px solid var(--rule);padding:8px 16px;font-size:11px;text-decoration:none}
.teaching-sequence{margin:28px 0 40px;border-top:1px solid var(--rule)}.teaching-step{position:relative;padding:24px 0 24px 16px;border-bottom:1px solid var(--rule);border-left:2px solid transparent;scroll-margin-top:96px}.teaching-step[data-active]{border-left-color:var(--accent);background:linear-gradient(90deg,#e9f1ee66,transparent)}.step-label{font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}.teaching-step h3{font:24px/1.2 Georgia,serif;margin:10px 0 14px}.teaching-step p{margin:12px 0}.step-observe{font-size:14px;color:var(--muted)}.step-observe strong{color:var(--ink);font-weight:600;margin-right:5px}.show-teaching-step{border:0;padding:5px 0;color:var(--accent);background:transparent;font-size:12px;text-decoration:underline;text-underline-offset:3px}
.proof-card{padding:12px 14px;margin:20px 0;font-size:12px;border-left-width:2px;background:#fff}.proof-card h3{font:14px/1.35 system-ui,sans-serif}.proof-card>p{line-height:1.5}.claim-toggle{font-size:11px;padding:5px 8px;margin:4px 0}.proof-card>details{font-size:11px}
.research-book .chapter-example{background:transparent;border:0;border-top:1px solid var(--rule);border-radius:0;padding:12px 0;margin:20px 0}.research-book .chapter-example h2{font:18px Georgia,serif}.research-book .chapter-example>p{display:none}.research-book .chapter-example button{padding:7px 10px;font-size:12px}.research-book .chapter-example a{font-size:12px}.preview-notice{font-size:12px;padding:10px 28px;margin:0;background:#f6eedf;border-bottom:1px solid #decdb5;color:#66513c}
@media(min-width:1100px){#close-example{display:none}.research-book.dock-closed .layout{grid-template-columns:190px minmax(0,740px)}.research-book.dock-closed .book-toolbar{display:flex}}
@media(max-width:1250px) and (min-width:1100px){body.research-book .layout{grid-template-columns:154px minmax(0,1fr) 350px;gap:22px;padding:24px 18px}.toc{font-size:11px}main{font-size:15px}}
@media(max-width:1099px){.book-toolbar{display:flex}.research-book .layout{display:block;max-width:760px;padding:24px 24px 70px}.research-book .toc{display:none}.research-book.contents-open .toc{display:block;position:fixed;top:58px;left:0;bottom:0;z-index:40;background:var(--paper);width:min(340px,90vw);padding:20px 18px;height:calc(100dvh - 58px);max-height:calc(100dvh - 58px);margin:0;align-self:auto;box-shadow:8px 0 25px #18363d20;border-right:1px solid var(--rule)}.research-book .example-dock{position:fixed;z-index:25;left:12px;right:12px;bottom:0;top:auto;height:54dvh;max-height:600px;border-radius:8px 8px 0 0;box-shadow:0 -8px 25px #18363d14}.research-book.dock-open .layout{padding-bottom:calc(54dvh + 40px)}.dock-heading{padding:8px 12px}.dock-heading h2{font-size:17px}.dock-heading .eyebrow{display:none}.dock-follow{padding:5px 12px}#open-laboratory{padding:5px 12px}.teaching-step{scroll-margin-top:0}}
@media(max-width:600px){header.hero{padding:20px 16px!important}.hero h1{font-size:29px}.research-book .layout{padding:20px 18px 60px}main{font-size:16px;line-height:1.7}main>h1{font-size:29px}.teaching-step{padding:20px 0 20px 12px}.teaching-step h3{font-size:23px}.research-book .example-dock{left:0;right:0}.preview-notice{padding:10px 16px}.show-teaching-step{min-height:40px}}
}
@media print{.book-toolbar,.example-dock,.book-downloads,.show-teaching-step{display:none!important}.teaching-sequence{margin:4mm 0}.teaching-step{break-inside:avoid;margin:4mm 0;border-left:1px solid #d8e1df;padding-left:4mm}.step-label{font-size:10.5pt;color:#52676d}.teaching-step h3{font-size:13pt;margin:2mm 0}.step-observe{font-size:10.5pt}.preview-notice{font-size:10.5pt}.claim-technical[hidden]{display:block!important}}