/* GitLab Duo course — shared stylesheet.
   Tufte-inspired: generous margins, readable serif body, restrained colour.
   Linked by every lesson and reference doc so the course looks like one thing. */

:root {
  --ink: #1a1a1a;
  --muted: #5b5b5b;
  --paper: #fdfcf9;
  --rule: #e3e0d8;
  --accent: #6e49cb;        /* GitLab-ish purple */
  --accent-soft: #f1ecfb;
  --good: #2e7d4f;
  --warn: #b25a00;
  --code-bg: #f4f2ec;
  --maxw: 46rem;
}

* { box-sizing: border-box; }

html { font-size: 18px; }

body {
  margin: 0 auto;
  max-width: var(--maxw);
  padding: 4rem 1.5rem 6rem;
  background: var(--paper);
  color: var(--ink);
  font-family: et-book, Palatino, "Palatino Linotype", Georgia, serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* --- Kicker / breadcrumb --- */
.kicker {
  font-family: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.4rem;
}

h1 {
  font-size: 2.1rem;
  line-height: 1.15;
  margin: 0 0 0.4rem;
  font-weight: 700;
}
.subtitle {
  font-style: italic;
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 2.2rem;
}

h2 {
  font-size: 1.35rem;
  margin: 2.6rem 0 0.6rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.25rem;
}
h3 { font-size: 1.08rem; margin: 1.8rem 0 0.4rem; }

p { margin: 0.7rem 0; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

/* --- Callouts --- */
.note, .warn, .key, .teach {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.8rem 1.1rem;
  margin: 1.4rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.96rem;
}
.warn { border-color: var(--warn); background: #fbf1e6; }
.key  { border-color: var(--good); background: #ecf6f0; }
.teach{ border-color: #c79a00; background: #fbf7e3; }
.note .label, .warn .label, .key .label, .teach .label {
  display: block;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
  color: var(--muted);
}

/* --- Code --- */
code {
  font-family: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  padding: 1rem 1.2rem;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.45;
}
pre code { background: none; padding: 0; }

/* --- Tables --- */
table { border-collapse: collapse; width: 100%; margin: 1.4rem 0; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.5rem 0.7rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-family: "SF Mono", ui-monospace, monospace; font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }

/* --- Citations --- */
.cite { font-size: 0.82rem; color: var(--muted); }
sup.ref a { text-decoration: none; font-weight: 700; }

/* --- Quiz widget (paired with assets/quiz.js) --- */
.quiz { border: 1px solid var(--rule); border-radius: 10px; padding: 1.2rem 1.3rem; margin: 1.6rem 0; background: #fff; }
.quiz .q { font-weight: 700; margin-bottom: 0.8rem; }
.quiz button.opt {
  display: block; width: 100%; text-align: left;
  font: inherit; font-size: 0.95rem;
  margin: 0.4rem 0; padding: 0.6rem 0.8rem;
  background: var(--paper); border: 1px solid var(--rule); border-radius: 7px;
  cursor: pointer; transition: background 0.12s, border-color 0.12s;
}
.quiz button.opt:hover { border-color: var(--accent); }
.quiz button.opt.correct { background: var(--accent-soft); border-color: var(--good); }
.quiz button.opt.wrong { background: #fbeaea; border-color: #c0392b; }
.quiz .feedback { margin-top: 0.7rem; font-size: 0.9rem; min-height: 1.2rem; }
.quiz .feedback.ok { color: var(--good); }
.quiz .feedback.no { color: #c0392b; }

/* --- Footer nav --- */
.lesson-nav {
  margin-top: 3.5rem; padding-top: 1.2rem; border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font-size: 0.9rem;
}
.ask {
  margin-top: 2.5rem; padding: 1rem 1.2rem;
  background: var(--accent-soft); border-radius: 8px;
  font-size: 0.92rem; font-style: italic;
}

/* --- Home link (top of every lesson/reference page) --- */
.home-link {
  display: inline-block;
  font-family: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 1.6rem;
}
.home-link:hover { color: var(--accent); }

/* --- Print --- */
@media print {
  body { background: #fff; max-width: none; padding: 1.5rem; font-size: 11pt; }
  .home-link { display: none; }
  .quiz button.opt { break-inside: avoid; }
  a { color: var(--ink); }
}