:root {
  color-scheme: dark;
  --bg: #171a1c;
  --surface: #202527;
  --ink: #f2f3ee;
  --muted: #b2bbb7;
  --line: #3a4240;
  --accent: #bbd9c7;
  --amber: #f0cb8d;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--ink);
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--accent); text-underline-offset: .22em; }
a:hover { color: white; }
a:focus-visible, input:focus-visible { outline: 2px solid var(--amber); outline-offset: 5px; }
.skip { position: absolute; left: 20px; top: -100px; padding: 12px; background: var(--bg); z-index: 5; }
.skip:focus { top: 10px; }
.site-header, main, .site-footer { width: min(1120px, calc(100% - 64px)); margin-inline: auto; }
.site-header { display: flex; gap: 30px; align-items: center; justify-content: space-between; padding-block: 26px; border-bottom: 1px solid var(--line); }
.brand { font-size: 24px; font-weight: 850; letter-spacing: -.04em; text-decoration: none; color: var(--ink); }
.site-nav { display: flex; flex-wrap: wrap; gap: 10px 24px; font-size: 14px; }
.site-nav a { color: var(--muted); text-decoration: none; padding-block: 5px; }
.site-nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 9px; }
.site-nav a:hover { color: var(--ink); }
main { padding-block: 58px 80px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.025em; text-wrap: balance; }
h1 { font-size: clamp(36px, 5vw, 64px); margin: 0 0 20px; font-weight: 700; }
h2 { font-size: clamp(25px, 3vw, 36px); margin: 0 0 20px; font-weight: 650; }
h3 { font-size: 18px; margin: 28px 0 14px; }
p { margin: 0 0 20px; max-width: 72ch; }
.muted, .dates { color: var(--muted); }
.hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: end; padding-bottom: 48px; }
.hero h1 { font-size: clamp(72px, 10vw, 96px); font-weight: 850; letter-spacing: -.04em; margin-bottom: 5px; }
.hero .subtitle { font-size: 24px; margin: 0; color: var(--muted); }
.hero-date { font-size: 24px; margin-bottom: 10px; }
.format { color: var(--muted); font-size: 16px; margin: 0; }
.legend { border-block: 1px solid var(--line); padding-block: 24px; margin-bottom: 60px; }
.legend h2 { font-size: 16px; letter-spacing: 0; margin-bottom: 18px; }
.legend-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; }
.legend p { color: var(--muted); font-size: 14px; margin: 0; }
.badge { display: inline-block; font-size: 11px; line-height: 1.5; font-weight: 650; letter-spacing: .02em; border: 1px solid #52695b; padding: 2px 8px; border-radius: 5px; color: #c6e3cf; vertical-align: middle; white-space: nowrap; }
.badge.inferred { color: var(--amber); border-color: #796343; }
.legend .badge { margin: 0 8px 6px 0; }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; margin-bottom: 12px; }
.section-heading h2 { margin-bottom: 12px; }
.week { display: grid; grid-template-columns: 160px 1fr 1.15fr; gap: 30px; border-top: 1px solid var(--line); padding: 32px 0; }
.week:last-child { border-bottom: 1px solid var(--line); }
.week-label { color: var(--accent); margin-bottom: 8px; font-weight: 600; }
.week .dates { font-size: 14px; }
.week h3 { font-size: 30px; margin: 0 0 12px; }
.week h3 a { color: var(--ink); }
.week .instructor-name { margin: 0; font-size: 16px; }
.week p { margin-bottom: 14px; }
.progression { font-size: 14px; color: var(--muted); }
.architect { margin-top: 56px; display: grid; grid-template-columns: 1fr 2fr; gap: 30px; }
.architect h2 { font-size: 24px; }
.architect p { margin-bottom: 10px; }
.source-note { font-size: 14px; color: var(--muted); padding-top: 32px; margin-top: 32px; border-top: 1px solid var(--line); }
.page-intro { max-width: 860px; margin-bottom: 40px; }
.page-intro .theme { font-size: 24px; color: var(--accent); margin-bottom: 12px; }
.page-intro .lead { font-size: 22px; line-height: 1.5; }
.profile-links { display: flex; gap: 22px; flex-wrap: wrap; font-size: 14px; }
.layout { display: grid; grid-template-columns: 220px minmax(0,1fr); gap: 58px; align-items: start; }
.contents { position: sticky; top: 24px; }
.contents h2 { font-size: 16px; letter-spacing: 0; margin: 0 0 18px; }
.contents ol, .contents ul { list-style: none; padding: 0; margin: 0; }
.contents li { border-top: 1px solid var(--line); }
.contents a { display: block; padding-block: 12px; font-size: 14px; color: var(--muted); text-decoration: none; }
.contents a:hover { color: white; }
.contents .day { display: block; color: var(--accent); font-size: 11px; margin-bottom: 3px; }
.lesson { border-top: 1px solid var(--line); padding: 32px 0 44px; scroll-margin-top: 24px; }
.lesson-date { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; color: var(--muted); font-size: 13px; margin-bottom: 14px; }
.lesson h2 { max-width: 28ch; }
.concepts { display: flex; gap: 8px 18px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; color: var(--muted); }
.concepts li { border-bottom: 1px solid var(--line); padding-bottom: 4px; }
.inferred-list { padding-left: 22px; }
.inferred-list li { padding: 0 0 14px 5px; }
.inferred-list .badge { margin-left: 6px; }
.source-links { list-style: none; padding: 0; margin: 0; font-size: 14px; }
.source-links li { margin-bottom: 8px; overflow-wrap: anywhere; }
details { border-block: 1px solid var(--line); padding: 20px 0; margin-block: 20px; }
summary { cursor: pointer; color: var(--accent); }
details .source-links { padding-top: 20px; }
.week-pagination { display: flex; gap: 30px; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 28px; margin-top: 24px; flex-wrap: wrap; }
.research h2 { font-size: 26px; margin-top: 50px; scroll-margin-top: 24px; }
.research h2:first-child { margin-top: 0; }
.research ul { list-style: none; padding: 0; margin: 0; }
.research li { border-top: 1px solid var(--line); padding: 24px 0; overflow-wrap: anywhere; }
.research p { color: var(--muted); }
.research-actions { display: flex; gap: 24px; flex-wrap: wrap; margin-bottom: 30px; }
.site-footer { border-top: 1px solid var(--line); padding-block: 26px 40px; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.site-footer p { margin: 0; }
@media (max-width: 800px) {
  .site-header, main, .site-footer { width: calc(100% - 40px); }
  .site-header { align-items: flex-start; gap: 24px; }
  .site-nav { gap: 8px 18px; justify-content: flex-end; }
  .hero { grid-template-columns: 1fr; gap: 24px; }
  .week { grid-template-columns: 110px 1fr; gap: 20px; }
  .week-body { grid-column: 2; }
  .layout { grid-template-columns: 1fr; gap: 32px; }
  .contents { position: static; }
  .contents ol, .contents ul { display: grid; grid-template-columns: 1fr 1fr; gap: 0 22px; }
}
@media (max-width: 500px) {
  main { padding-top: 28px; }
  .site-header { display: block; padding-block: 18px; }
  .site-nav { justify-content: flex-start; margin-top: 16px; gap: 8px 12px; }
  .hero { gap: 18px; padding-bottom: 32px; }
  .hero h1 { font-size: 64px; }
  .legend-grid { grid-template-columns: 1fr; gap: 16px; }
  .legend { padding-block: 20px; margin-bottom: 32px; }
  .section-heading { display: block; }
  .week { grid-template-columns: 1fr; gap: 12px; }
  .week-meta { display: flex; gap: 16px; align-items: baseline; flex-wrap: wrap; }
  .week-meta p { margin-bottom: 0; }
  .week-body { grid-column: 1; }
  .architect { grid-template-columns: 1fr; gap: 4px; margin-top: 40px; }
  .hero-date { font-size: 21px; }
  .page-intro .lead { font-size: 20px; }
  .lesson h2 { font-size: 28px; }
  .contents ol, .contents ul { grid-template-columns: 1fr; }
}
@media print {
  :root { color-scheme: light; --bg: white; --ink: black; --muted: #333; --accent: #174c37; --line: #bbb; }
  .site-nav, .contents, .skip { display: none; }
  .layout { display: block; }
  .badge, .badge.inferred { color: black; border-color: #555; }
  .lesson { break-inside: avoid; }
}

/* Full lessons remain readable as local files, with no script dependency. */
.badge.independent { color: #c4d9ed; border-color: #526879; }
.legend-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.start-reading { margin-block: 0 48px; }
.read-button { display: inline-block; padding: 10px 16px; margin: 0 16px 8px 0; border-radius: 6px; background: var(--accent); color: #17221c; font-weight: 650; text-decoration: none; }
.read-button:hover { background: #d6eadf; color: #17221c; }
.full-lesson-link { margin-block: 22px; }
.full-lesson-link .badge { margin-bottom: 8px; }
.reading-page { max-width: 800px; }
.lesson-back { font-size: 14px; margin-bottom: 24px; }
.full-lesson-header h1 { font-size: clamp(32px, 4.5vw, 54px); }
.full-lesson-header .dates { font-size: 14px; }
.full-lesson-header .badge { margin-right: 8px; }
.lesson-toc { margin-block: 28px 36px; }
.lesson-toc ul { padding-left: 24px; }
.lesson-toc li { margin-block: 8px; }
.reading-body { font-size: 17px; line-height: 1.75; overflow-wrap: anywhere; }
.reading-body h2 { margin-top: 52px; font-size: clamp(26px, 3vw, 32px); scroll-margin-top: 24px; }
.reading-body h3 { margin-top: 32px; font-size: 23px; scroll-margin-top: 24px; }
.reading-body p, .reading-body ul, .reading-body ol { max-width: 72ch; }
.reading-body li { margin-bottom: 12px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .9em; }
p code, li code { background: var(--surface); padding: 2px 5px; border-radius: 3px; }
pre { overflow-x: auto; padding: 22px; background: var(--surface); border-radius: 8px; line-height: 1.65; margin-block: 28px; }
pre code { white-space: pre; font-size: 14px; }
.reading-page .week-pagination a { flex: 1 1 230px; }
.research-record { padding-block: 36px; border-top: 1px solid var(--line); scroll-margin-top: 24px; overflow-wrap: anywhere; }
.research-record h3 { font-size: 22px; margin-top: 36px; }
.research-record li { margin-bottom: 18px; }
@media (max-width: 800px) { .legend-grid { grid-template-columns: 1fr; } }
@media (max-width: 500px) {
  .reading-body { font-size: 16px; }
  .reading-body ul, .reading-body ol { padding-left: 24px; }
  .reading-body h2 { margin-top: 38px; }
  pre { padding: 16px; }
}
@media print {
  .lesson-toc, .read-button { display: none; }
  pre, p code, li code { background: #eee; }
  .reading-body { font-size: 11pt; }
  pre { white-space: pre-wrap; }
}