/* Learn to Draw — one stylesheet for screen and print.
   Palette is the course's own kit: carbon ink, sketchbook white and the
   three-colour triad (ultramarine, alizarin, azo yellow) + burnt sienna. */

:root {
  --paper: #fcfcfa;
  --paper-2: #f3f4f1;
  --ink: #20222b;          /* carbon blue-black */
  --ink-2: #4f535e;
  --wash: #8b909a;         /* grey wash, for quiet text */
  --rule: #dfe1e4;
  --ultramarine: #2c4c9c;  /* Part A: seeing; links */
  --alizarin: #a42b3b;     /* Part B: medium; mistakes */
  --azo: #c99417;          /* Part C: subjects */
  --sienna: #8e4a26;
  --part: var(--ultramarine);

  --serif: "Alegreya", Georgia, serif;
  --sans: "Alegreya Sans", "Helvetica Neue", Arial, sans-serif;

  --measure: 36rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
}

body.part-b { --part: var(--alizarin); }
body.part-c { --part: var(--azo); }

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.1875rem/1.6 var(--serif);
  font-variant-numeric: oldstyle-nums;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--ultramarine); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--ultramarine); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3, h4 { font-family: var(--serif); line-height: 1.2; font-weight: 700; margin: 0; }
h1 { font-size: clamp(2.2rem, 5vw, 3.2rem); font-weight: 800; letter-spacing: -0.01em; }
h2 { font-size: 1.75rem; margin-top: 3.5rem; margin-bottom: 1rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; margin-top: 1.5rem; }
p, ul, ol { margin: 0 0 1rem; }
li + li { margin-top: 0.35rem; }
blockquote {
  margin: 1.5rem 0; padding: 0 0 0 1.25rem;
  border-left: 3px solid var(--part);
  font-style: italic; color: var(--ink-2);
}
blockquote cite { display: block; font-style: normal; font-family: var(--sans); font-size: 0.85rem; margin-top: 0.4rem; }

/* ---------- Layout ---------- */

.layout {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 0 var(--gutter);
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.outline {
  position: sticky; top: 0;
  align-self: start;
  max-height: 100vh; overflow-y: auto;
  padding: 2rem 0 2rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  line-height: 1.35;
}
.outline summary { display: none; }
.outline .home {
  display: block; margin-bottom: 1.75rem;
  font-family: var(--serif); font-weight: 800; font-size: 1.35rem;
  color: var(--ink); text-decoration: none; line-height: 1.1;
}
.outline h2 {
  font-family: var(--sans); font-size: 0.95rem; font-weight: 700;
  color: var(--ink-2); margin: 1.25rem 0 0.4rem;
}
.outline ol, .outline ul { list-style: none; padding: 0; margin: 0; }
.outline li { margin: 0; }
.outline a {
  display: grid; grid-template-columns: 1.6rem 1fr;
  padding: 0.28rem 0.5rem 0.28rem 0.4rem;
  color: var(--ink); text-decoration: none; border-radius: 3px;
}
.outline ul a { grid-template-columns: 1fr; }
.outline a .n { color: var(--wash); font-variant-numeric: lining-nums tabular-nums; }
.outline a:hover { background: var(--paper-2); }
.outline a[aria-current="page"] { background: var(--paper-2); font-weight: 700; box-shadow: inset 3px 0 0 var(--part); }
.outline .soon { color: var(--wash); }

main { padding: 2.5rem 0 5rem; min-width: 0; }
main > * { max-width: var(--measure); }
main > .wide, main > figure.wide { max-width: 52rem; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .outline { position: static; max-height: none; padding: 1rem 0 0; border-bottom: 1px solid var(--rule); }
  .outline summary {
    display: flex; justify-content: space-between; align-items: center;
    cursor: pointer; list-style: none; padding: 0.5rem 0 1rem;
  }
  .outline summary::-webkit-details-marker { display: none; }
  .outline summary .home { margin: 0; }
  .outline summary .toggle { font-size: 0.95rem; color: var(--ultramarine); }
  .outline > .home { display: none; }
  main { padding-top: 1.5rem; }
}

/* ---------- Page headers ---------- */

.module-head { margin-bottom: 2.5rem; max-width: 52rem; }
.module-head .part { font-family: var(--sans); color: var(--ink-2); margin: 0 0 0.75rem; }
.module-head .title { display: flex; align-items: center; gap: 1.25rem; }
.module-head .num {
  flex: none;
  display: grid; place-items: center;
  width: 5.5rem; height: 5.5rem;
  font-family: var(--serif); font-weight: 800; font-size: 2.75rem;
  font-variant-numeric: lining-nums;
  color: var(--paper);
  /* a wash swatch: pigment pools darker at the rim, lighter where the brush lifted */
  background:
    radial-gradient(ellipse at 38% 35%, color-mix(in srgb, var(--part) 62%, #fff) 0%, transparent 60%),
    var(--part);
  border-radius: 46% 54% 51% 49% / 55% 47% 53% 45%;
  box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--part) 75%, #000);
  text-shadow: 0 1px 0 color-mix(in srgb, var(--part) 60%, #000);
}
.module-head .overview { font-size: 1.3rem; line-height: 1.5; margin-top: 1.5rem; max-width: var(--measure); }

.at-a-glance {
  display: flex; flex-wrap: wrap; gap: 0.5rem 2rem;
  font-family: var(--sans); font-size: 0.95rem; color: var(--ink-2);
  margin: 1.25rem 0 0; padding: 0; list-style: none;
}
.at-a-glance li { margin: 0; }
.at-a-glance b { color: var(--ink); }

/* ---------- Figures ---------- */

figure { margin: 2rem 0; }
figure img { border-radius: 2px; }
figcaption {
  font-family: var(--sans); font-size: 0.9rem; line-height: 1.45; color: var(--ink-2);
  margin-top: 0.6rem; max-width: var(--measure);
}
figcaption .credit { display: block; color: var(--wash); font-size: 0.82rem; margin-top: 0.2rem; }
figure.art img { border: 1px solid var(--rule); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 600px) { .pair { grid-template-columns: 1fr; } }

/* ---------- Concepts ---------- */

.concept { margin: 1.25rem 0; padding-left: 1.25rem; border-left: 3px solid var(--rule); }
.concept dt { font-weight: 700; }
.concept dd { margin: 0.1rem 0 0.9rem; }

/* ---------- Exercise brief: the heart of the course ---------- */

.exercise {
  max-width: 44rem;
  margin: 2.5rem 0;
  background: #fff;
  border: 1px solid var(--rule);
  border-top: 4px solid var(--part);
  border-radius: 2px 2px 4px 4px;
}
.exercise > header {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
  padding: 1.1rem 1.5rem 0.9rem;
  border-bottom: 1px solid var(--rule);
}
.exercise > header h3 { font-size: 1.4rem; }
.exercise .time {
  flex: none; margin: 0;
  font-family: var(--sans); font-weight: 700; font-size: 1rem;
  font-variant-numeric: lining-nums;
  color: var(--part);
  white-space: nowrap;
}
.exercise dl {
  display: grid; grid-template-columns: 8.5rem minmax(0, 1fr);
  margin: 0; padding: 0.4rem 1.5rem 0.6rem;
}
.exercise dt, .exercise dd { padding: 0.75rem 0; border-top: 1px solid var(--paper-2); }
.exercise dt:first-of-type, .exercise dd:first-of-type { border-top: 0; }
.exercise dt {
  font-family: var(--sans); font-weight: 700; font-size: 0.95rem; color: var(--ink-2);
  padding-top: 0.95rem; padding-right: 1rem;
}
.exercise dd { margin: 0; }
.exercise dd > :last-child { margin-bottom: 0; }
.exercise dd ol, .exercise dd ul { padding-left: 1.2rem; }
.exercise dd figure { margin: 1rem 0 0.25rem; }
.exercise .source {
  margin: 0; padding: 0.8rem 1.5rem;
  background: var(--paper-2);
  font-family: var(--sans); font-size: 0.85rem; color: var(--ink-2);
}
.verify {
  display: inline-block; margin-left: 0.4rem;
  padding: 0 0.4rem; border: 1px solid var(--azo); border-radius: 3px;
  color: #7a5a0c; font-size: 0.8rem; white-space: nowrap;
}
@media (max-width: 600px) {
  .exercise dl { grid-template-columns: 1fr; padding: 0.4rem 1.1rem 0.6rem; }
  .exercise dt { padding-bottom: 0; border-top: 1px solid var(--paper-2); }
  .exercise dd { border-top: 0; padding-top: 0.25rem; }
  .exercise > header { flex-direction: column; gap: 0.2rem; padding: 1rem 1.1rem 0.8rem; }
  .exercise .source { padding: 0.8rem 1.1rem; }
}

/* ---------- Mistakes, rubric, gate ---------- */

.mistakes { list-style: none; padding: 0; }
.mistakes li { padding-left: 1.6rem; position: relative; margin-bottom: 0.9rem; }
.mistakes li::before {
  content: "✕"; position: absolute; left: 0; top: 0.05rem;
  color: var(--alizarin); font-family: var(--sans); font-weight: 700;
}
.mistakes b { font-weight: 700; }

.rubric { counter-reset: r; list-style: none; padding: 0; }
.rubric li {
  counter-increment: r;
  display: grid; grid-template-columns: 2rem 1fr; gap: 0.25rem;
  padding: 0.7rem 0; border-top: 1px solid var(--rule); margin: 0;
}
.rubric li:last-child { border-bottom: 1px solid var(--rule); }
.rubric li::before {
  content: counter(r);
  font-family: var(--sans); font-weight: 700; color: var(--part);
  font-variant-numeric: lining-nums;
}
.scoring { font-family: var(--sans); font-size: 0.95rem; color: var(--ink-2); }

.gate {
  padding: 1.25rem 1.5rem 0.5rem;
  background: color-mix(in srgb, var(--part) 7%, var(--paper));
  border-radius: 4px;
}
.gate ul { padding-left: 1.2rem; }

.resources li { margin-bottom: 0.6rem; }
.resources .note { color: var(--ink-2); }

.sheets-list { list-style: none; padding: 0; }
.sheets-list a { font-weight: 700; }

.next {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  margin-top: 4rem; padding-top: 1.25rem; border-top: 1px solid var(--rule);
  font-family: var(--sans);
}

.callout {
  padding: 1rem 1.25rem; border-radius: 4px;
  background: var(--paper-2); font-size: 1.05rem;
}

/* ---------- Home ---------- */

.hero { margin: 0 0 2.5rem; max-width: 56rem; }
.hero img { width: 100%; }
.lede { font-size: 1.35rem; line-height: 1.5; }

.course-map { max-width: 52rem; }
.course-map section { margin-top: 2.5rem; }
.course-map h2 { margin: 0 0 0.25rem; }
.course-map > section > p { color: var(--ink-2); }
.course-map ol { list-style: none; padding: 0; margin: 1rem 0 0; }
.course-map li { margin: 0; border-top: 1px solid var(--rule); }
.course-map li a, .course-map li > span {
  display: grid; grid-template-columns: 2.5rem 1fr; gap: 0 0.5rem;
  padding: 0.85rem 0.25rem; color: var(--ink); text-decoration: none;
}
.course-map li a:hover { background: var(--paper-2); }
.course-map .n {
  font-weight: 800; font-size: 1.4rem; line-height: 1.2; color: var(--part);
  font-variant-numeric: lining-nums;
}
.course-map .t { font-weight: 700; }
.course-map .d { grid-column: 2; color: var(--ink-2); font-size: 1rem; }
.course-map .soon .t::after { content: " (being written)"; font-weight: 400; color: var(--wash); font-size: 0.9rem; font-family: var(--sans); }
.course-map .part-b { --part: var(--alizarin); }
.course-map .part-c { --part: var(--azo); }

/* ---------- Tables ---------- */

table { border-collapse: collapse; width: 100%; font-size: 1rem; margin: 1.5rem 0; }
th, td { text-align: left; vertical-align: top; padding: 0.6rem 0.75rem 0.6rem 0; border-bottom: 1px solid var(--rule); }
th { font-family: var(--sans); font-size: 0.9rem; color: var(--ink-2); font-weight: 700; }
.table-wrap { overflow-x: auto; max-width: 52rem; }

/* ---------- Glossary ---------- */

.glossary dt { font-weight: 700; margin-top: 1.1rem; }
.glossary dd { margin: 0.15rem 0 0; }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

@media print {
  .outline, .next { display: none; }
  .layout { display: block; padding: 0; }
  body { font-size: 11pt; }
}

/* fixes after review */
.outline a.home, .outline a.home[aria-current="page"] { display: block; padding: 0; background: none; box-shadow: none; font-weight: 800; }
main > h1 { margin-bottom: 1rem; }