/* Shared course chrome — Tufte-leaning, print-friendly. */

:root {
  --ink: #1c1917;
  --ink-soft: #44403c;
  --paper: #f7f1e5;
  --paper-2: #efe6d4;
  --rule: #d6cbb6;
  --accent: #9a3412;
  --accent-2: #1d4e4a;
  --good: #166534;
  --bad: #9f1239;
  --chip-0: #9a3412;
  --chip-1: #1d4e4a;
  --chip-2: #7c3aed;
  --chip-3: #b45309;
  --chip-4: #0369a1;
  --chip-5: #be185d;
  --serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --sans: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "Cascadia Mono", ui-monospace, monospace;
}

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

html {
  font-size: 19px;
  line-height: 1.55;
  background: var(--paper);
  color: var(--ink);
}

body {
  margin: 0;
  font-family: var(--serif);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--ink);
}

.mast {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 1.25rem 6vw 0;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.mast a {
  color: inherit;
  text-decoration: none;
}

.mast a:hover {
  color: var(--accent);
}

article {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

figure {
  margin: 1.5rem 0 0.4rem;
}

h1,
h2,
h3 {
  font-family: var(--sans);
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.35rem;
  margin: 0.4rem 0 0.6rem;
}

h2 {
  font-size: 1.25rem;
  margin: 2.4rem 0 0.7rem;
  color: var(--accent-2);
}

h3 {
  font-size: 1.02rem;
  margin: 1.6rem 0 0.4rem;
}

.kicker {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin: 0 0 1.6rem;
}

p,
li {
  margin: 0 0 1rem;
}

ul, ol {
  padding-left: 1.2rem;
}

blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}

code, kbd {
  font-family: var(--mono);
  font-size: 0.86em;
}

pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  line-height: 1.45;
}

.sidenote {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  padding-top: 0.7rem;
  margin: 1.4rem 0 1.6rem;
}

cite {
  font-style: normal;
}

.lab {
  background: #fffdf8;
  border: 1px solid var(--rule);
  padding: 1rem 1rem 1.15rem;
  margin: 1.4rem 0 1.8rem;
}

.lab h3 {
  margin-top: 0;
}

.lab textarea {
  width: 100%;
  min-height: 6.2rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.7rem;
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
  resize: vertical;
}

.lab-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-family: var(--sans);
  font-size: 0.88rem;
  margin: 0.7rem 0 0.85rem;
}

.lab-meta strong {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  min-height: 2.4rem;
}

.chip {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: #fff;
  padding: 0.18rem 0.42rem;
  border-radius: 2px;
  white-space: pre-wrap;
}

.chip.space::before {
  content: "·";
  opacity: 0.55;
}

.hint {
  font-family: var(--sans);
  font-size: 0.84rem;
  color: var(--ink-soft);
  margin: 0.8rem 0 0;
}

.quiz fieldset {
  border: 1px solid var(--rule);
  background: #fffdf8;
  margin: 0 0 1rem;
  padding: 0.9rem 1rem 0.4rem;
}

.quiz legend {
  font-family: var(--sans);
  font-weight: 650;
  padding: 0 0.35rem;
}

.quiz label {
  display: flex;
  gap: 0.55rem;
  align-items: baseline;
  font-family: var(--sans);
  font-size: 0.95rem;
  margin: 0 0 0.65rem;
  cursor: pointer;
}

.quiz input {
  margin-top: 0.2rem;
}

.quiz button {
  font-family: var(--sans);
  font-size: 0.95rem;
  background: var(--ink);
  color: var(--paper);
  border: 0;
  padding: 0.55rem 1rem;
  cursor: pointer;
}

.quiz button:hover {
  background: var(--accent);
}

.feedback {
  font-family: var(--sans);
  margin: 0.8rem 0 0;
  min-height: 1.4em;
}

.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }

.callout {
  border: 1px solid var(--rule);
  padding: 0.9rem 1rem;
  margin: 1.6rem 0;
  background: var(--paper-2);
}

.callout.scope {
  background: #fffdf8;
}

.pseudo {
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  margin: 0.4rem 0 0.2rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

footer.lesson-foot {
  margin-top: 2.8rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.map-list {
  list-style: none;
  padding: 0;
}

.map-list li {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 0.8rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
}

.map-list .n {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.map-list.now .current {
  background: var(--paper-2);
  margin: 0 -0.6rem;
  padding: 0.7rem 0.6rem;
}

.status {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

@media print {
  html { font-size: 12pt; background: #fff; }
  .mast, .quiz, .lab { break-inside: avoid; }
  a { color: inherit; text-decoration: none; }
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.75em;
    color: #444;
  }
}

/* ----- Course progress (progress.js) ----- */

.course-nav {
  margin-top: 2.4rem;
  font-family: var(--sans);
}

.course-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  border: 1px solid var(--rule);
  background: #fffdf8;
  padding: 0.8rem 1rem;
}

.course-status.is-done {
  border-color: var(--good);
  background: #f0f7ef;
}

.course-state {
  margin: 0;
  font-size: 0.92rem;
}

.course-status.is-done .course-state::before {
  content: "✓ ";
  color: var(--good);
  font-weight: 650;
}

.course-nav button,
.course-tools button,
.course-tools label {
  font-family: var(--sans);
  font-size: 0.88rem;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink-soft);
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}

.course-nav button:hover,
.course-tools button:hover,
.course-tools label:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.course-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin: 1rem 0 0.6rem;
}

.course-pager a {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  border: 1px solid var(--rule);
  padding: 0.7rem 0.9rem;
  text-decoration: none;
  color: var(--ink);
}

.course-pager a:hover {
  border-color: var(--accent);
}

.course-pager a span {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.course-pager a strong {
  font-weight: 650;
  font-size: 0.92rem;
}

.course-pager .next {
  text-align: right;
}

.course-meta {
  font-size: 0.82rem;
  color: var(--ink-soft);
}

@media (max-width: 560px) {
  .course-pager { grid-template-columns: 1fr; }
  .course-pager .next { text-align: left; }
}

/* Status on home and map lists */

[data-status] {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.is-done [data-status] { color: var(--good); }
.is-done [data-status]::before { content: "✓ "; }
.is-started [data-status] { color: var(--accent); }

.map-list li.is-done .n { color: var(--good); }

/* Home page */

.progress-bar {
  --pct: 0%;
  height: 0.5rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  margin: 0.4rem 0 1rem;
}

.progress-bar::before {
  content: "";
  display: block;
  height: 100%;
  width: var(--pct);
  background: var(--good);
  transition: width 0.3s;
}

.progress-count {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
}

.cta {
  display: inline-block;
  font-family: var(--sans);
  font-size: 1rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 0.65rem 1.1rem;
  margin: 0.4rem 0 1.2rem;
}

.cta:hover {
  background: var(--accent);
  color: var(--paper);
}

.ref-grid {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr));
  gap: 0.4rem 1rem;
  font-family: var(--sans);
  font-size: 0.92rem;
}

.ref-grid li { margin: 0; }

.course-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.course-tools input[type=file] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.course-tools label:focus-within {
  outline: 2px solid var(--accent);
}

@media print {
  .course-nav, .course-tools { display: none; }
}