/* Shared lesson stylesheet. Tufte-adjacent: one column, generous margins,
   sidenotes, printable. Every lesson links this file. */

:root {
  --ink: #111;
  --ink-soft: #555;
  --rule: #d8d4cc;
  --paper: #fffef9;
  --accent: #7a2e1d;
  --code-bg: #f4f2ec;
  --ok: #1f6b3a;
  --warn: #8a5a00;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8e4dc;
    --ink-soft: #a09a90;
    --rule: #3a3630;
    --paper: #14130f;
    --accent: #e0a08c;
    --code-bg: #201e19;
    --ok: #6fbf8c;
    --warn: #d9ab53;
  }
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: Palatino, "Palatino Linotype", Georgia, serif;
  font-size: 17px;
  line-height: 1.55;
  max-width: 42rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 6rem;
}

h1 { font-size: 1.9rem; line-height: 1.2; margin: 0 0 .3rem; }
h2 { font-size: 1.25rem; margin: 2.6rem 0 .6rem; border-bottom: 1px solid var(--rule); padding-bottom: .25rem; }
h3 { font-size: 1.02rem; margin: 1.6rem 0 .4rem; }

.subtitle { color: var(--ink-soft); font-style: italic; margin: 0 0 2rem; }

a { color: var(--accent); }

code, pre, .mono {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: .84em;
}

pre {
  background: var(--code-bg);
  border-left: 3px solid var(--rule);
  padding: .8rem 1rem;
  overflow-x: auto;
  line-height: 1.45;
}

table { border-collapse: collapse; width: 100%; margin: 1rem 0; font-size: .9rem; }
th, td { text-align: left; padding: .4rem .6rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 600; }
td.mono, th.mono { font-family: "SF Mono", Menlo, Consolas, monospace; font-size: .82rem; }

blockquote {
  margin: 1.2rem 0;
  padding: .1rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
}

.cite { font-size: .8rem; color: var(--ink-soft); }

.callout {
  border: 1px solid var(--rule);
  border-left: 4px solid var(--warn);
  padding: .8rem 1rem;
  margin: 1.4rem 0;
  background: var(--code-bg);
}
.callout h4 { margin: 0 0 .4rem; font-size: .9rem; text-transform: uppercase; letter-spacing: .06em; color: var(--warn); }

/* --- quiz component --- */
.quiz { border-top: 2px solid var(--rule); margin-top: 2.5rem; padding-top: 1rem; }
.q { margin: 1.6rem 0; }
.q p.stem { margin: 0 0 .6rem; font-weight: 600; }
.q button {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: .92rem;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--rule);
  padding: .5rem .7rem;
  margin: .3rem 0;
  cursor: pointer;
  border-radius: 3px;
}
.q button:hover { border-color: var(--accent); }
.q button.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, var(--paper)); }
.q button.wrong { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--paper)); }
.q .feedback { font-size: .88rem; color: var(--ink-soft); margin-top: .5rem; min-height: 1.2em; }

.next { border-top: 2px solid var(--rule); margin-top: 3rem; padding-top: 1rem; font-size: .92rem; }

/* --- bar chart component: <td><span class="bar" style="--w:73%"></span></td> --- */
table.chart td { padding: .18rem .5rem; border-bottom: none; }
table.chart tr:hover { background: var(--code-bg); }
table.chart td.num { text-align: right; font-family: "SF Mono", Menlo, monospace; font-size: .78rem; white-space: nowrap; }
.bar { display: block; height: .72rem; background: var(--accent); opacity: .55; width: var(--w); min-width: 1px; border-radius: 1px; }
.bar.alt { background: var(--warn); opacity: .8; }
tr.peak .bar { opacity: .95; }
tr.peak td.num { font-weight: 700; }

@media print {
  body { max-width: none; font-size: 11pt; }
  .quiz button { break-inside: avoid; }
}