/* course.css — shared styles for the Pharo course.
   Tufte-inspired: warm paper, serif prose, generous margins, prints cleanly.
   Self-contained: system fonts only, no external requests. */

:root {
  --paper:    #fdfaf3;
  --ink:      #2b2825;
  --muted:    #6b655c;
  --rule:     #e2dccd;
  --accent:   #8a3324;      /* Pharo-ish burnt sienna */
  --accent-2: #1c5d78;
  --code-bg:  #f4efe2;
  --good:     #2f6b34;
  --code-font: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --prose-font: "Palatino Linotype", Palatino, "Iowan Old Style", Georgia, serif;
}

* { box-sizing: border-box; }

html { font-size: 18px; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--prose-font);
  line-height: 1.55;
  max-width: 46rem;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 6rem;
  -webkit-text-size-adjust: 100%;
}

/* ---- masthead ---- */
.eyebrow {
  font-family: var(--code-font);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.4rem;
}
h1 {
  font-weight: 600;
  font-size: 2.1rem;
  line-height: 1.1;
  margin: 0 0 0.6rem;
}
.subtitle { color: var(--muted); font-style: italic; margin: 0 0 2rem; font-size: 1.05rem; }

h2 {
  font-weight: 600;
  font-size: 1.3rem;
  margin: 2.6rem 0 0.6rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--rule);
}
h3 { font-weight: 600; font-size: 1.05rem; margin: 1.6rem 0 0.4rem; }

p, li { font-size: 1rem; }
a { color: var(--accent-2); text-decoration: none; border-bottom: 1px solid rgba(28,93,120,0.3); }
a:hover { border-bottom-color: var(--accent-2); }

/* ---- code ---- */
code {
  font-family: var(--code-font);
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.5;
}
pre code { background: none; padding: 0; font-size: 0.82rem; }
.comment { color: var(--muted); font-style: italic; }
.res { color: var(--good); font-weight: 600; }  /* an evaluation result */

/* ---- callouts ---- */
.callout {
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.9rem 1.2rem;
  margin: 1.4rem 0;
  background: #fffdf7;
}
.callout.win   { border-left: 4px solid var(--good); }
.callout.rule  { border-left: 4px solid var(--accent); }
.callout.task  { border-left: 4px solid var(--accent-2); background: #f6fbfd; }
.callout h3 { margin-top: 0; }
.callout .tag {
  font-family: var(--code-font); font-size: 0.68rem; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--muted); display:block; margin-bottom: 0.3rem;
}

/* ---- quiz (details/summary, no JS needed) ---- */
.quiz { margin: 1.1rem 0; }
.quiz .q { font-weight: 600; margin-bottom: 0.5rem; }
.options { list-style: none; padding: 0; margin: 0 0 0.6rem; }
.options li {
  font-family: var(--code-font); font-size: 0.85rem;
  padding: 0.35rem 0.7rem; margin: 0.3rem 0;
  border: 1px solid var(--rule); border-radius: 4px; background: #fff;
}
details.answer {
  border: 1px dashed var(--rule); border-radius: 4px;
  padding: 0.2rem 0.8rem; background: #fffdf7;
}
details.answer summary {
  cursor: pointer; font-size: 0.85rem; color: var(--accent);
  font-family: var(--code-font); padding: 0.3rem 0;
}
details.answer[open] { padding-bottom: 0.7rem; }
details.answer .why { margin-top: 0.4rem; font-size: 0.95rem; }

/* ---- misc ---- */
kbd {
  font-family: var(--code-font); font-size: 0.75rem;
  background: #fff; border: 1px solid var(--rule);
  border-bottom-width: 2px; border-radius: 4px; padding: 0.05em 0.4em;
}
hr { border: none; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
.crumbs { font-family: var(--code-font); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.06em; }
.footer-nav {
  margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule);
  font-family: var(--code-font); font-size: 0.8rem; display:flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
}
.ask {
  margin-top: 2.5rem; font-style: italic; color: var(--muted);
  border-top: 1px dotted var(--rule); padding-top: 1rem;
}
table { border-collapse: collapse; width: 100%; margin: 1.2rem 0; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.45rem 0.7rem; border-bottom: 1px solid var(--rule); }
th { font-family: var(--code-font); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
td.mono, .mono { font-family: var(--code-font); font-size: 0.85rem; }

@media (max-width: 480px) { html { font-size: 16px; } body { padding: 2rem 1rem 4rem; } }

@media print {
  :root { --paper: #fff; }
  body { max-width: 100%; padding: 0; }
  details.answer { border: none; }
  details.answer summary { display: none; }
  details.answer[open], details.answer { padding: 0; }
  details.answer > *:not(summary) { display: block !important; }
  .footer-nav, .ask { page-break-inside: avoid; }
  a { color: var(--ink); border: none; }
}

/* dark mode for on-screen reading; print always light */
@media (prefers-color-scheme: dark) {
  :root {
    --paper:#1c1a17; --ink:#e9e2d4; --muted:#a49c8d; --rule:#3a352d;
    --code-bg:#26231d; --accent:#e0866f; --accent-2:#6db8d6;
  }
  .callout, details.answer, .options li, kbd { background:#221f1a; }
  .callout.task { background:#1d2225; }
}