/*
WCAG sRGB contrast: C = (Llighter + 0.05) / (Ldarker + 0.05).
L = 0.2126 R + 0.7152 G + 0.0722 B; channel c = s/12.92 when
s <= 0.04045, otherwise ((s + 0.055) / 1.055)^2.4; s = byte/255.
Ratios below are rounded down to six decimals. Every text pair >= 4.5.
text ink/paper 12.933527; ink/surface 14.607098; ink/soft 12.169120.
text muted/paper 7.003293; muted/surface 7.909507; muted/soft 6.589381.
text link/paper 7.802569; link/surface 8.812206; link/soft 7.341415.
text accent/paper 7.129461; accent/surface 8.052000; accent/soft 6.708092.
text danger/paper 7.047253; danger/surface 7.959153; danger/soft 6.630741.
text surface/ink 14.607098; surface/accent 8.052000.
UI line/paper 4.117912; line/surface 4.650761; line/soft 3.874532.
SVG accent/soft 6.708092; surface/accent 8.052000; surface/ink 14.607098;
ink/surface 14.607098; line/soft 3.874532. Focus ink/surface 14.607098.
Surface fills alone are decorative; meaningful edges use line or ink.
Default: system fonts. Optional local reading chain: OpenDyslexic, Lexend,
Atkinson Hyperlegible, Verdana, system-ui, sans-serif. No font downloads.
No font guarantees accessibility; learner choice and adjustable spacing help.
*/

:root {
  --ink: #182B36;
  --muted: #405460;
  --link: #174E75;
  --accent: #145A50;
  --danger: #922E24;
  --line: #667780;
  --paper: #F4F1E8;
  --surface: #FFFFFF;
  --soft: #E5ECE8;
  --reading-leading: 1.65;
  color: var(--ink);
  background: var(--paper);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 100%;
  line-height: var(--reading-leading);
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; }
a { color: var(--link); text-underline-offset: 0.2em; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 0.15em; }
:focus { outline: 3px solid var(--ink); outline-offset: 4px; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; }
h1, h2, h3, p, ul, ol, pre, fieldset { margin-top: 0; }
h1 { font-size: clamp(2rem, 5vw, 3.3rem); line-height: 1.5; letter-spacing: -0.03em; margin-bottom: 1rem; }
h2 { font-size: 1.5rem; line-height: 1.5; margin-bottom: 0.75rem; }
h3 { font-size: 1.125rem; line-height: 1.5; margin-bottom: 0.5rem; }
p { margin-bottom: 1rem; }
li { margin-bottom: 0.4rem; }
button, input, select, textarea { font: inherit; line-height: inherit; max-width: 100%; }
button, .button {
  display: inline-block; color: var(--surface); background: var(--accent);
  border: 2px solid var(--accent); border-radius: 0.35rem; padding: 0.65rem 1rem;
  min-height: 44px; cursor: pointer; text-align: left; text-decoration: none;
  white-space: normal; overflow-wrap: anywhere;
}
button:hover, .button:hover { text-decoration: underline; text-underline-offset: 0.2em; }
button.secondary { background: var(--surface); color: var(--link); border-color: var(--line); }
button[aria-disabled="true"] { cursor: default; }
textarea, select, input { color: var(--ink); background: var(--surface); border: 2px solid var(--line); border-radius: 0.25rem; padding: 0.6rem; }
textarea { display: block; width: 100%; min-height: 7rem; resize: vertical; }
label { display: block; font-weight: 600; margin-bottom: 0.4rem; }
small, .small { font-size: 0.875rem; }
code, pre { font-family: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace; }
code { background: var(--soft); color: var(--ink); padding: 0.05rem 0.2rem; overflow-wrap: anywhere; }
pre { padding: 1rem; background: var(--soft); color: var(--ink); border: 1px solid var(--line); white-space: pre-wrap; overflow-wrap: anywhere; }
pre code { padding: 0; }
section, [id] { scroll-margin-top: 1.5rem; }
.frame { width: 100%; max-width: 960px; margin-inline: auto; padding-inline: clamp(1rem, 3vw, 2rem); }
.text-column { max-width: 70ch; }
.site-header { display: flex; justify-content: space-between; gap: 1.5rem; align-items: center; flex-wrap: wrap; padding-block: 1.3rem; border-bottom: 1px solid var(--line); }
.brand { display: flex; gap: 0.65rem; align-items: center; color: var(--ink); font-weight: 700; text-decoration: none; }
.crest { color: var(--surface); background: var(--ink); padding: 0.35rem 0.5rem; font-size: 0.8rem; letter-spacing: 0.04em; }
.nav-links, .flat-menu { display: flex; flex-wrap: wrap; gap: 0.65rem 1.25rem; list-style: none; padding: 0; margin: 0; }
.nav-links a, .flat-menu a { display: inline-block; padding-block: 0.4rem; min-height: 44px; }
.hero { padding-block: 2.6rem 1.7rem; }
.eyebrow { color: var(--accent); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.09em; text-transform: uppercase; margin-bottom: 0.6rem; }
.muted { color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.8rem 1rem; margin-block: 1rem; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 0.5rem; padding: clamp(1rem, 3vw, 1.5rem); margin-bottom: 1.25rem; }
.notice { background: var(--soft); border-left: 4px solid var(--accent); padding: 1rem; }
.error { color: var(--danger); }
.error-box { border: 2px solid var(--danger); padding: 1rem; background: var(--surface); }
.skip-link { position: absolute; left: 1rem; top: -10rem; z-index: 10; background: var(--surface); padding: 0.75rem; }
.skip-link:focus { top: 1rem; }
.campus-map { position: relative; background: var(--soft); border: 1px solid var(--line); border-radius: 0.5rem; margin-block: 1rem; isolation: isolate; }
.map-art { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; }
.map-ground { fill: var(--soft); }
.map-path { fill: none; stroke: var(--line); stroke-width: 5; }
.map-pad { fill: var(--surface); stroke: var(--ink); stroke-width: 3; }
.map-building { fill: var(--accent); stroke: var(--surface); stroke-width: 3; }
.map-roof { fill: var(--ink); stroke: var(--surface); stroke-width: 3; }
.map-window { fill: var(--surface); }
.map-labels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 5rem 1rem; min-height: 34rem; padding: 5.5rem 1.5rem 1.5rem; }
.building { align-self: end; background: var(--surface); border: 2px solid var(--line); border-radius: 0.35rem; padding: 0.85rem; }
.building p { font-size: 0.875rem; color: var(--muted); margin: 0; }
.building-link { display: inline-block; font-weight: 700; padding-block: 0.2rem; min-height: 44px; }
.map-caption { font-size: 0.875rem; color: var(--muted); }
.service-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-block: 2rem; }
.service-grid .panel { margin: 0; }
.site-footer { margin-top: 2.5rem; padding-block: 1.5rem; border-top: 1px solid var(--line); font-size: 0.875rem; color: var(--muted); }
.lesson-list { padding-left: 1.5rem; }
.lesson-list li { margin-bottom: 1rem; }
.lesson-list a { display: inline-block; min-height: 44px; padding-block: 0.4rem; }
.lesson-section { border-left: 4px solid var(--accent); padding-left: 1.2rem; margin-block: 1.8rem; }
.lesson-section p, .lesson-section ul, .lesson-section pre { margin-bottom: 0.85rem; }
.checkpoint { background: var(--surface); border: 2px solid var(--accent); border-radius: 0.5rem; padding: 1.25rem; margin-block: 1.5rem; }
.checkpoint h2 { color: var(--accent); }
.checkpoint:focus, .quiz-panel:focus { outline-offset: 6px; }
.checkpoint-summary { font-weight: 600; }
.anchor-target { display: block; height: 0; }
.preferences { margin-block: 1.2rem; }
summary { cursor: pointer; min-height: 44px; padding-block: 0.4rem; }
.preference-fields { display: flex; flex-wrap: wrap; gap: 1rem; padding-block: 1rem; }
.font-readable { font-family: OpenDyslexic, Lexend, "Atkinson Hyperlegible", Verdana, system-ui, sans-serif; }
.font-verdana { font-family: Verdana, system-ui, sans-serif; }
.quiz-panel { margin-block: 2rem; }
.quiz-options { display: grid; gap: 0.6rem; }
.quiz-option { background: var(--surface); color: var(--ink); border-color: var(--line); width: 100%; }
.quiz-option.key-option { background: var(--soft); color: var(--accent); border: 3px solid var(--accent); }
.quiz-option.chosen-option { border: 3px solid var(--danger); color: var(--danger); }
.quiz-option.key-option.chosen-option { border-color: var(--accent); color: var(--accent); }
.feedback { margin-top: 1.2rem; padding: 1rem; background: var(--soft); border-left: 4px solid var(--accent); }
.feedback p:last-child { margin-bottom: 0; }
.question-progress { font-weight: 600; color: var(--muted); }
.week-rail { background: var(--surface); border: 1px solid var(--line); border-radius: 0.5rem; padding: 1rem 1.15rem; margin-bottom: 1.25rem; }
.week-rail-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 0.5rem 1.5rem; }
.week-rail-item { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem; margin-bottom: 0; }
.week-rail-item a { display: inline-block; min-height: 44px; padding-block: 0.25rem; }
.week-rail-item.current > a { color: var(--accent); font-weight: 700; }
.rail-flag { color: var(--muted); font-size: 0.875rem; border: 1px solid var(--line); border-radius: 0.25rem; padding: 0 0.4rem; }
.resume-card { background: var(--soft); border-left: 4px solid var(--accent); padding: 1rem 1.15rem; margin-bottom: 1.25rem; }
.resume-card h2 { margin-bottom: 0.35rem; }
.resume-card p { margin-bottom: 0.6rem; }
.lab-panel { border: 1px solid var(--line); border-radius: 0.5rem; padding: 1rem; margin-top: 1.1rem; background: var(--surface); }
.lab-panel h3 { margin-bottom: 0.4rem; }
.lab-tabs { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.9rem; }
.lab-tab { background: var(--surface); color: var(--ink); border: 2px solid var(--line); }
.lab-tab[aria-selected="true"] { background: var(--soft); color: var(--accent); border: 3px solid var(--accent); font-weight: 700; }
.lab-view { border: 1px solid var(--line); border-radius: 0.4rem; padding: 0.9rem; background: var(--surface); }
.lab-frame { display: block; width: 100%; height: 30rem; border: 1px solid var(--line); background: var(--soft); }
.lab-evidence { min-height: 12rem; }
.checkpoint-resolution { margin-top: 0.9rem; padding: 0.9rem; background: var(--soft); border-left: 4px solid var(--accent); }
.checkpoint-resolution p { margin-bottom: 0.6rem; }
.checkpoint-resolution p:last-child { margin-bottom: 0; }
.canonical-claim { white-space: normal; overflow-wrap: anywhere; }
@media (max-width: 860px) {
  .lab-tabs { display: grid; grid-template-columns: 1fr; }
  .lab-tab { width: 100%; }
  .week-rail-list { grid-template-columns: 1fr; }
  .lab-frame { height: 22rem; }
}
@media (max-width: 600px) {
  .map-art { display: none; }
  .map-labels { grid-template-columns: 1fr; min-height: 0; gap: 0.8rem; padding: 1rem; }
  .service-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 1.8rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
@media (forced-colors: active) {
  .map-art { display: none; }
  .key-option, .chosen-option { border-style: double; }
}