:root{color-scheme:dark;--bg:#080d1b;--panel:#0f172a;--ink:#ecf1f8;--muted:#94a3b8;--faint:#7a8ba3;--line:#293752;--accent:#38bdf8;--success:#34d399;--violet:#c084fc;--paper:#f2efe7}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 82% 0%,rgba(56,189,248,.11),transparent 28rem),radial-gradient(circle at 12% 20%,rgba(192,132,252,.07),transparent 24rem),var(--bg);color:var(--ink);font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.65;letter-spacing:-.005em}a{color:inherit}.skip{position:fixed;left:1rem;top:-4rem;z-index:20;background:var(--paper);color:#1c1917;padding:.65rem 1rem;border-radius:.5rem}.skip:focus{top:1rem}.shell{width:min(1120px,calc(100% - 2rem));margin:auto}.site-nav{display:flex;align-items:center;justify-content:space-between;min-height:76px;border-bottom:1px solid rgba(41,55,82,.7)}.wordmark{font-family:Fraunces,Georgia,serif;font-size:1.22rem;font-weight:650;text-decoration:none}.nav-links{display:flex;align-items:center;gap:.5rem}.quiet-link,.primary-link{display:inline-flex;align-items:center;min-height:44px;padding:.55rem .9rem;border-radius:999px;text-decoration:none;font-size:.83rem;font-weight:650}.quiet-link{color:var(--muted)}.primary-link{background:var(--accent);color:#07101d}.quiet-link:hover{color:var(--ink)}.primary-link:hover{background:#7dd3fc}.quiet-link:focus-visible,.primary-link:focus-visible,a:focus-visible{outline:3px solid rgba(56,189,248,.62);outline-offset:3px}.hero{padding:5.8rem 0 4.5rem;border-bottom:1px solid rgba(41,55,82,.7)}.eyebrow{font:600 .72rem/1.3 "JetBrains Mono",ui-monospace,monospace;text-transform:uppercase;letter-spacing:.14em;color:var(--accent)}h1,h2,h3{font-family:Fraunces,Georgia,serif;letter-spacing:-.025em;line-height:1.08}h1{font-size:clamp(2.65rem,7vw,5.7rem);max-width:13ch;margin:.7rem 0 1.25rem}h2{font-size:clamp(1.65rem,3vw,2.35rem);margin:2.8rem 0 1rem}h3{font-size:1.28rem;margin:2rem 0 .7rem}.lede{max-width:62ch;color:var(--muted);font-size:clamp(1.04rem,2vw,1.25rem)}.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:.55rem;margin-top:2rem}.meta-row,.chips{display:flex;flex-wrap:wrap;gap:.5rem}.meta-row{margin-top:1.7rem;color:var(--faint);font:500 .78rem/1.4 "JetBrains Mono",ui-monospace,monospace}.chip{display:inline-flex;border:1px solid var(--line);border-radius:999px;padding:.38rem .65rem;color:var(--muted);font:500 .72rem/1.3 "JetBrains Mono",ui-monospace,monospace}.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:clamp(2rem,6vw,5.5rem);padding:4rem 0}.prose{min-width:0}.prose>h2:first-child{margin-top:0}.prose p,.prose li{color:#d7deea}.prose ul,.prose ol{padding-left:1.3rem}.prose li+li{margin-top:.42rem}.prose code{border:1px solid rgba(56,189,248,.2);background:rgba(56,189,248,.07);color:#8fddfb;border-radius:.34rem;padding:.1rem .3rem;font:500 .86em/1.5 "JetBrains Mono",ui-monospace,monospace}.prose pre{overflow:auto;margin:1.3rem 0;border:1px solid var(--line);border-radius:1rem;background:#0b1223;padding:1.1rem 1.2rem;box-shadow:0 22px 60px -45px #000}.prose pre code{border:0;background:none;color:#e6ecf5;padding:0;font-size:.87rem;white-space:pre}.side{align-self:start;position:sticky;top:1.5rem}.note{border:1px solid var(--line);border-radius:1.1rem;background:rgba(15,23,42,.78);padding:1.25rem;box-shadow:inset 0 1px rgba(255,255,255,.025)}.note+.note{margin-top:.85rem}.note-label{font:600 .68rem/1.3 "JetBrains Mono",ui-monospace,monospace;text-transform:uppercase;letter-spacing:.12em;color:var(--success)}.note h2{font-size:1.45rem;margin:.65rem 0}.note p{color:var(--muted);font-size:.9rem}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;padding:3rem 0}.course-card,.lesson-card{border:1px solid var(--line);border-radius:1.1rem;background:rgba(15,23,42,.72);text-decoration:none}.course-card{display:flex;min-height:270px;flex-direction:column;padding:1.35rem}.course-card:hover,.lesson-card:hover{border-color:rgba(56,189,248,.55);transform:translateY(-2px)}.course-card h2{font-size:1.7rem;margin:1rem 0 .6rem}.course-card p,.lesson-card p{color:var(--muted);font-size:.88rem}.course-card .arrow{margin-top:auto;color:var(--accent);font-weight:650}.lesson-list{display:grid;gap:.75rem;padding:2.5rem 0 4rem}.lesson-card{display:grid;grid-template-columns:58px minmax(0,1fr) auto;align-items:center;gap:1rem;padding:1rem 1.15rem}.lesson-number{font:500 .78rem/1 "JetBrains Mono",ui-monospace,monospace;color:var(--faint)}.lesson-card h2{font:650 1.15rem/1.2 Fraunces,Georgia,serif;margin:0}.lesson-card p{margin:.35rem 0 0}.lesson-time{color:var(--faint);font:500 .72rem/1.3 "JetBrains Mono",ui-monospace,monospace}.pager{display:grid;grid-template-columns:1fr 1fr;gap:.8rem;margin-top:3.5rem}.pager a{border:1px solid var(--line);border-radius:.85rem;padding:1rem;text-decoration:none}.pager a:last-child{text-align:right}.pager small{display:block;color:var(--faint);font:.68rem/1.3 "JetBrains Mono",ui-monospace,monospace;text-transform:uppercase;letter-spacing:.1em}.footer{margin-top:4rem;border-top:1px solid rgba(41,55,82,.7);padding:2rem 0 3rem;color:var(--faint);font-size:.78rem}.footer-row{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}.footer a{color:var(--muted)}@media(max-width:820px){.content-grid{grid-template-columns:1fr}.side{position:static}.course-grid{grid-template-columns:1fr}.hero{padding-top:4rem}.lesson-card{grid-template-columns:40px minmax(0,1fr)}.lesson-time{grid-column:2}}@media(max-width:520px){.shell{width:min(100% - 1.25rem,1120px)}.site-nav{min-height:66px}.nav-links .quiet-link{display:none}.hero{padding:3.4rem 0 3rem}h1{font-size:clamp(2.5rem,13vw,4rem)}.content-grid{padding-top:2.6rem}.pager{grid-template-columns:1fr}.pager a:last-child{text-align:left}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}.course-card:hover,.lesson-card:hover{transform:none}}
.prose pre code{display:block;max-width:100%;overflow-x:auto}.prose .table-scroll{max-width:100%;overflow-x:auto;margin:1.3rem 0;border:1px solid var(--line);border-radius:1rem}.prose table{width:100%;table-layout:fixed;border-collapse:collapse;background:rgba(15,23,42,.5)}.prose th,.prose td{padding:.75rem .85rem;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;color:#d7deea;overflow-wrap:anywhere}.prose th:first-child,.prose td:first-child{width:30%}.prose th{background:rgba(56,189,248,.07);color:var(--ink);font-weight:650}.prose tbody tr:last-child td{border-bottom:0}.chip code{color:var(--ink);font:600 1em/1.3 "JetBrains Mono",ui-monospace,monospace}
#main:focus{outline:3px solid rgba(56,189,248,.62);outline-offset:-3px}

/* Values live in design-system/tokens.ts, inlined by both HTML entry paths.
   This sheet owns reusable public components/materials, not a second palette. */

/* Display copy protects letterforms rather than hiding a rectangular panel.
   Not for dense reading, controls, code or tables: those keep solid backing. */
.brand-display-copy {
  position: relative;
  isolation: isolate;
  text-shadow: var(--brand-display-shadow);
}
.brand-display-copy::before {
  content: "";
  position: absolute;
  inset: -16px -24px;
  z-index: -1;
  pointer-events: none;
  background: var(--brand-display-backing);
}
.brand-display-copy > :is(h1, h2, p) {
  background: transparent;
  box-shadow: none;
}

/* One navigation geometry for the SPA and authored static documents. */
.brand-header {
  box-sizing: border-box;
  position: relative;
  z-index: 5;
  display: flex;
  flex: none;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  width: 100%;
  min-height: var(--brand-header-height);
  margin: 0;
  padding: 16px 40px;
  border-bottom: 1px solid var(--study-line);
  background: transparent;
}
.brand-header > a:first-child {
  display: inline-flex;
  align-items: center;
  min-height: var(--brand-target-min);
  flex: none;
  font: 600 20px/1 var(--brand-font-ui);
  letter-spacing: -0.025em;
  text-decoration: none;
  color: var(--study-ink);
  background: var(--study-bg);
  box-shadow: var(--brand-reading-shadow);
  border-radius: 4px;
}
.brand-header nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.brand-header .brand-header-action {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: var(--brand-target-min);
  padding: 8px 14px;
  border: 1px solid var(--study-line);
  border-radius: var(--brand-pill-radius);
  font: 500 13px/20px var(--brand-font-ui);
  text-decoration: none;
  color: var(--study-ink);
  background: var(--study-panel);
}
.brand-header-short { display: none; }
.public-flow-still {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  color: var(--study-accent);
}
.public-flow-still svg { width: 100%; height: 100%; }
[data-motion="ready"] .public-flow-still { visibility: hidden; }
@media (max-width: 900px) {
  .brand-header { padding-inline: 24px; }
}
@media (max-width: 640px) {
  .brand-header { padding: 14px 20px; gap: 8px; }
  .brand-header .brand-header-long { display: none; }
  .brand-header-short { display: inline; }
  .brand-header .brand-header-action { padding-inline: 12px; }
  .brand-header .nav-links .quiet-link { display: none; }
}

/* Shared tokens are embedded ahead of this sheet by the static generator. */
body.public-theme {
  --bg: var(--study-bg);
  --panel: var(--study-panel);
  --ink: var(--study-ink);
  --muted: var(--study-muted);
  --faint: var(--brand-faint);
  --line: var(--study-line);
  --accent: var(--study-accent);
  background: var(--bg);
  isolation: isolate;
}
#discovery-motion { position: fixed; inset: 0; z-index: -1; pointer-events: none; }
.motion-study-canvas { position: fixed; inset: 0; width: 100%; height: 100%; opacity: 0; transition: opacity var(--brand-field-arrival) ease; }
body[data-motion="ready"] .motion-study-canvas { opacity: 1; }
.public-theme .shell { width: min(1120px, calc(100% - 80px)); }
.public-theme :is(h1,h2,h3) { font-weight: 500; }
.public-theme h1 { font-size: clamp(40px, 6vw, 76px); max-width: 18ch; text-wrap: balance; }
.public-theme .primary-link { background: var(--ink); color: var(--bg); text-align: center; justify-content: center; text-wrap: balance; }
.public-theme .primary-link:hover { background: var(--accent); }
.public-theme a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.public-theme :is(.hero,.footer) { border-color: var(--line); }
.public-theme :is(.hero > .shell, main > .shell) { background: transparent; }
.public-theme .hero > .shell > *,
.public-theme main > section.shell > :is(.eyebrow,h2),
.public-theme .prose > :is(h1,h2,h3,p,ul,ol,blockquote),
.public-theme .footer-row > *,
.public-theme .nav-links > .quiet-link {
  background: var(--bg);
  box-shadow: var(--brand-reading-shadow);
}
/* Protect section text, not the open interval around the course library. */
.public-theme main > section.shell > :is(.eyebrow,h2) {
  width: fit-content;
  max-width: 100%;
}
.public-theme .hero { border: 0; }
.public-theme .recovery { min-height: 60vh; display: grid; align-items: center; }
.public-theme .hero > .shell { padding-block: 24px; }
.public-theme .content-grid { padding-inline: 24px; width: min(1168px, calc(100% - 32px)); }
.public-theme :is(.course-card,.lesson-card,.note,.prose pre,.prose table) { background: var(--panel); box-shadow: none; }
.public-theme .course-card { min-height: 260px; }
.public-theme :is(a.course-card,a.lesson-card):hover { border-color: var(--accent); }
.public-theme :is(article.course-card,article.lesson-card):hover { transform: none; border-color: var(--line); }
.public-theme :is(.prose p,.prose li,.prose th,.prose td) { color: var(--ink); }
.public-theme .prose code { color: var(--accent); background: var(--brand-code); border-color: var(--line); }
.public-theme .prose pre code { color: var(--ink); background: none; }
/* Long inline expressions wrap as prose; preformatted examples keep scrolling. */
.public-theme .prose :not(pre) > code { overflow-wrap: anywhere; }
/* Markdown inside a chip is one text flow, not anonymous flex columns. */
.public-theme .chip { display: block; max-width: 100%; overflow-wrap: anywhere; }
.public-theme .prose th { background: var(--brand-tableHeader); }
.public-theme .footer { background: transparent; }
.public-theme .footer a { display: inline-flex; align-items: center; min-height: 44px; }
.public-theme #main:focus { outline: none; }
.public-theme #main:focus-visible h1 { outline: 2px solid var(--accent); outline-offset: 8px; }
@media(max-width:760px) {
  .public-theme .shell { width: calc(100% - 40px); }
  .public-theme .hero { padding-block: 24px; }
  .public-theme .content-grid { padding-inline: 12px; width: calc(100% - 16px); }
  .public-theme h1 { font-size: clamp(40px, 10vw, 60px); }
}
@media(prefers-reduced-motion:reduce) { .motion-study-canvas { transition: none; } }