:root { color-scheme: light; --ink:#202124; --muted:#7a7e84; --line:#e9eaec; --accent:#187d9d; }
body { font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; color:var(--ink); }
.layout { width:min(960px, calc(100% - 80px)); grid-template-columns:minmax(0, 680px) 150px; column-gap:100px; margin-top:140px; }
.layout > aside { position:sticky; top:64px; }
.layout > aside h1 { font-size:14px; letter-spacing:-.02em; }
.layout > aside nav { font-size:13px; gap:7px; }
.layout > aside nav a { color:#64686d; }
.layout > aside nav a[aria-current] { color:#111; }
.essay { font-size:16px; line-height:1.85; letter-spacing:-.012em; overflow-wrap:break-word; }
.eyebrow { display:flex; gap:20px; align-items:center; color:var(--muted); font:11px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing:.02em; }
.eyebrow span { margin-left:auto; }
.essay-header h1 { font-size:clamp(32px,4vw,46px); line-height:1.12; letter-spacing:-.055em; font-weight:550; white-space:normal; margin:25px 0 22px; max-width:620px; }
.essay .byline { font-size:13px; color:var(--muted); }
.essay-index { margin:40px 0 65px; padding:22px 0; border-block:1px solid var(--line); display:grid; gap:9px; font-size:13px; line-height:1.5; }
.essay-index a { display:flex; gap:16px; }
.essay-index span { color:#9c9fa3; font:11px/1.8 ui-monospace, SFMono-Regular, Menlo, monospace; }
.essay > h1 { white-space:normal; font-size:29px; line-height:1.25; letter-spacing:-.045em; font-weight:550; margin:90px 0 30px; padding-top:30px; border-top:1px solid var(--line); scroll-margin-top:50px; }
.essay > h1.unnumbered { margin-top:0; border:0; padding:0; }
.essay h2 { font-size:22px; line-height:1.35; font-weight:550; letter-spacing:-.035em; margin:58px 0 22px; scroll-margin-top:40px; }
.essay h3 { font-size:18px; font-weight:550; letter-spacing:-.025em; margin:40px 0 18px; }
.essay h4 { font-size:15px; font-weight:600; margin:30px 0 16px; }
.essay p { margin:0 0 22px; font-size:inherit; }
.essay li { padding-left:5px; margin-bottom:15px; }
.essay ol { padding-left:24px; }
.essay strong { font-weight:600; }
.essay .math.display { display:block; max-width:100%; overflow-x:auto; overflow-y:hidden; padding:24px 8px; margin:24px 0; font-size:1.02em; scrollbar-width:thin; }
.essay math[display="block"] { min-width:min-content; margin:0 auto; }
.essay .math.inline { white-space:nowrap; }
.essay figure { margin:36px 0; }
.essay figure img { display:block; width:100%; height:auto; }
.essay figure figure { margin:0; }
.essay figcaption, .figure-note { display:block; font-size:11px; line-height:1.6; color:var(--muted); text-align:left; margin-top:12px; }
.essay .plot { background:#fafbfc; border:1px solid #f0f1f3; border-radius:4px; padding:12px 8px; }
.essay pre { overflow:auto; background:#f7f8fa; border:1px solid var(--line); border-radius:5px; padding:24px; font:12px/1.85 ui-monospace, SFMono-Regular, Menlo, monospace; tab-size:4; letter-spacing:0; }
.essay pre a { text-decoration:none; }
.essay code .kw, .essay code .cf { color:#8260aa; }
.essay code .dv, .essay code .fl { color:#a76b2d; }
.essay code .st { color:#217e73; }
.essay code .bu, .essay code .fu { color:#267b99; }
.essay code .co { color:#91969d; }
.essay .table-scroll { width:100%; overflow:auto; margin:30px 0; }
.essay table { border-collapse:collapse; font-size:12px; font-variant-numeric:tabular-nums; min-width:100%; }
.essay th,.essay td { padding:13px 15px; border-bottom:1px solid var(--line); text-align:left; white-space:nowrap; }
.essay th { font-weight:550; background:#f8f9fa; }
.essay caption { text-align:left; font-size:11px; color:var(--muted); line-height:1.6; padding:10px 0; caption-side:bottom; white-space:normal; }
.essay-end { border-top:1px solid var(--line); margin-top:80px; padding-top:24px; color:var(--muted); font-size:11px; display:flex; justify-content:space-between; gap:20px; }
.essay a:hover { color:var(--accent); }
@media(min-width:701px) and (max-width:1050px) { .layout { column-gap:50px; grid-template-columns:minmax(0,1fr) 130px; } }
@media(max-width:700px) {
 .layout { display:flex; flex-direction:column; width:calc(100% - 48px); margin:44px auto 60px; }
 .layout > aside { order:-1; position:sticky; top:0; width:100%; background:rgba(255,255,255,.97); padding:16px 0; z-index:2; display:flex; justify-content:flex-end; align-items:baseline; gap:25px; margin-bottom:48px; }
 .layout > aside h1 { margin:0; }
 .layout > aside nav { flex-direction:row; gap:14px; font-size:12px; }
 main { width:100%; }
 .essay { font-size:15px; line-height:1.85; }
 .essay-header h1 { font-size:38px; }
 .essay-index { margin:32px 0 48px; }
 .essay > h1 { font-size:27px; scroll-margin-top:95px; }
 .essay h2 { scroll-margin-top:95px; }
}
@media(max-width:400px) { .layout { width:calc(100% - 36px); } .layout > aside { gap:16px; } .layout > aside nav { gap:10px; } .essay-header h1 { font-size:34px; } }

/* The Geometry of Learning: a web edition. Scoped to preserve existing pages. */
.learning-header { padding-bottom:12px; }
.learning-header h1 { font-size:clamp(52px,6.7vw,80px); font-weight:550; letter-spacing:-.065em; line-height:1.02; margin:42px 0 28px; }
.learning-header .byline { letter-spacing:0; font-size:13px; }
.learning-index { grid-template-columns:repeat(3,minmax(0,1fr)); align-items:start; gap:20px; margin:38px 0 78px; padding:24px 0; width:100%; }
.learning-index a { display:flex; flex-direction:column; gap:7px; }
.learning-essay { font-size:16px; line-height:1.92; letter-spacing:-.015em; }
.learning-essay > h1 { font-size:36px; margin:110px 0 34px; padding-top:35px; letter-spacing:-.05em; }
.learning-essay > h1:first-of-type { margin-top:0; border:0; padding-top:0; }
.learning-essay h2 { margin-top:74px; font-size:26px; }
.learning-essay h3 { margin-top:52px; font-size:20px; }
.learning-essay p { margin-bottom:26px; }
.learning-essay .math.display { padding:28px 10px; margin:30px 0; font-size:.98em; }
.learning-essay .learning-figure { margin:48px 0 52px; }
.learning-figure img { background:#fafcfc; border-radius:8px; }
.learning-figure figcaption { font-size:12px; line-height:1.8; margin:18px 0 0; color:#738087; }
.learning-figure figcaption .math.display { padding:12px 4px; margin:12px 0; }
.learning-essay .footnotes { border-top:1px solid var(--line); margin-top:80px; padding-top:25px; color:#738087; font-size:13px; }
.learning-essay .footnote-ref { font-size:11px; color:var(--accent); }
.project-list .eyebrow { margin-bottom:35px; }
.project-entry { position:relative; display:block; border-top:1px solid var(--line); padding:28px 40px 32px 0; }
.project-entry:hover { text-decoration:none; }
.project-entry:hover h2 { color:var(--accent); }
.project-entry h2 { font-size:27px; line-height:1.3; letter-spacing:-.035em; margin:9px 0 0; }
.project-date { font:11px ui-monospace, SFMono-Regular, Menlo, monospace; color:var(--muted); }
.project-arrow { position:absolute; right:0; top:55px; color:#89949a; font-size:19px; }
@media(max-width:700px) {
 .learning-header h1 { font-size:clamp(48px,11vw,70px); margin-top:32px; }
 .learning-essay { font-size:15px; }
 .learning-index { gap:12px; font-size:12px; margin-bottom:55px; }
 .learning-essay > h1 { font-size:30px; margin-top:80px; }
 .learning-essay h2 { font-size:24px; }
 .learning-essay .math.display { font-size:.92em; }
}

/* Synchronization essays share the existing web edition's type and rhythm. */
.sync-header h1 { font-size:clamp(50px,6.7vw,76px); }
.sync-header .essay-subtitle { display:block; font-size:clamp(23px,3vw,32px); font-weight:400; line-height:1.3; letter-spacing:-.035em; margin-top:24px; max-width:610px; }
.sync-index { grid-template-columns:repeat(2,minmax(0,1fr)); gap:18px 30px; align-items:start; }
.sync-index a { align-items:baseline; }
.sync-essay .essay-epigraph { margin:0 0 55px; padding:0 0 0 25px; border-left:2px solid #dbe7e8; color:#67747b; font-size:16px; line-height:1.95; }
.essay-epigraph cite { display:block; font-size:12px; font-style:normal; margin-top:16px; }
.sync-essay .portrait-figure img { max-height:420px; width:auto; max-width:100%; margin:0 auto; object-fit:contain; background:none; }
.sync-essay .learning-figure img { background:#fff; }
.sync-essay .essay-notes, .sync-essay .essay-references { border-top:1px solid var(--line); margin-top:70px; padding-top:10px; font-size:13px; line-height:1.8; color:#657179; }
.sync-essay .essay-notes li, .sync-essay .essay-references li { scroll-margin-top:80px; margin-bottom:22px; }
.sync-essay .essay-references a { overflow-wrap:anywhere; color:var(--accent); }
.sync-essay .footnote-ref, .sync-essay p a, .sync-essay figcaption a { color:var(--accent); }
.version-link { font-size:12px; color:var(--accent); display:inline-block; margin-top:5px; }
@media(max-width:700px) {
 .sync-header h1 { font-size:48px; }
 .sync-index { font-size:12px; gap:18px; }
 .sync-essay .essay-epigraph { font-size:15px; padding-left:18px; }
}

/* A quiet personal index, distinct from the essays themselves. */
.writing-index { max-width:600px; font-size:15px; line-height:1.6; }
.writing-index > h2 { font:inherit; margin:0 0 28px; }
.writing-index ul { list-style:none; margin:0; padding:0; }
.writing-index li { display:grid; grid-template-columns:42px minmax(0,1fr); gap:18px; align-items:baseline; margin:0 0 16px; }
.writing-index .writing-year { color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
.writing-index a { color:var(--ink); text-decoration:none; text-underline-offset:4px; }
.writing-index a:hover { text-decoration:underline; text-decoration-thickness:1px; }
@media(max-width:700px) { .writing-index li { gap:12px; } }