/* Shared stylesheet for every lesson and reference card in this course.
 * Tufte-inspired. Same two faces as the other courses on this hub, so the
 * site reads as one thing. Reference sheets in ../reference/ link it the same
 * way.
 */
@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,600;1,400&family=IBM+Plex+Mono:wght@400;600&display=swap');

:root {
  --ink: #111008;
  --ink-soft: #55534a;
  --paper: #fffdf7;
  --rule: #d8d3c2;
  --accent: #7a2f0e;
  --accent-soft: #f3e6dd;
  --mark: #fdf3c9;
  --ok: #1c6b3f;
  --bad: #97231b;
  --serif: 'EB Garamond', Palatino, Georgia, serif;
  --mono: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #eae6da; --ink-soft: #a09a8b; --paper: #14140f; --rule: #35342c;
    --accent: #e39264; --accent-soft: #2a1d15; --mark: #3a3313;
    --ok: #6fcf97; --bad: #ef8177;
  }
}
:root[data-theme="dark"] {
  --ink: #eae6da; --ink-soft: #a09a8b; --paper: #14140f; --rule: #35342c;
  --accent: #e39264; --accent-soft: #2a1d15; --mark: #3a3313;
  --ok: #6fcf97; --bad: #ef8177;
}

* { box-sizing: border-box; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.55;
  margin: 0;
  padding: 4rem 1.5rem 6rem;
}

.wrap { max-width: 40rem; margin: 0 auto; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.2rem;
}

h1 { font-size: 2.5rem; line-height: 1.1; font-weight: 600; margin: 0 0 0.4rem; letter-spacing: -0.01em; }
h2 { font-size: 1.5rem; font-weight: 600; margin: 3rem 0 0.8rem; }
h3 { font-size: 1.1rem; font-weight: 600; margin: 2rem 0 0.5rem; }
.sub { font-style: italic; color: var(--ink-soft); font-size: 1.1rem; margin: 0 0 2.5rem; }
p { margin: 0 0 1.1rem; }
a { color: var(--accent); text-underline-offset: 3px; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0; }

blockquote {
  margin: 1.8rem 0; padding: 0 0 0 1.4rem;
  border-left: 3px solid var(--accent);
  font-style: italic; color: var(--ink-soft);
}
blockquote cite { display: block; font-style: normal; font-family: var(--mono); font-size: 0.72rem; margin-top: 0.6rem; color: var(--ink-soft); }

code { font-family: var(--mono); font-size: 0.8em; background: var(--accent-soft); padding: 0.1em 0.35em; border-radius: 3px; }
pre {
  font-family: var(--mono); font-size: 0.72rem; line-height: 1.6;
  background: var(--accent-soft); color: var(--ink);
  padding: 1rem 1.1rem; border-radius: 5px; border: 1px solid var(--rule);
  overflow-x: auto;
}
pre code { background: none; padding: 0; font-size: inherit; }

mark { background: var(--mark); color: inherit; padding: 0 0.15em; }

.callout {
  border: 1px solid var(--rule); border-left: 4px solid var(--accent);
  background: var(--accent-soft); padding: 1rem 1.2rem; margin: 2rem 0;
  font-size: 0.92rem; border-radius: 0 5px 5px 0;
}
.callout strong { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; display: block; margin-bottom: 0.4rem; color: var(--accent); }

.table-scroll { overflow-x: auto; margin: 1.8rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.85rem; }
th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-family: var(--mono); font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); font-weight: 600; }

.sidenote { font-size: 0.8rem; color: var(--ink-soft); border-top: 1px solid var(--rule); padding-top: 0.6rem; margin: 1.8rem 0; }

/* --- quiz component (see quiz.js) --- */
.quiz { border: 1px solid var(--rule); border-radius: 6px; padding: 1.2rem 1.3rem; margin: 1.6rem 0; }
.quiz .q { font-weight: 600; margin: 0 0 0.9rem; font-size: 1rem; }
.quiz button.opt {
  display: block; width: 100%; text-align: left;
  font-family: var(--mono); font-size: 0.76rem; line-height: 1.5;
  background: var(--paper); color: var(--ink);
  border: 1px solid var(--rule); border-radius: 4px;
  padding: 0.6rem 0.75rem; margin-bottom: 0.45rem; cursor: pointer;
}
.quiz button.opt:hover:not(:disabled) { border-color: var(--accent); }
.quiz button.opt:disabled { cursor: default; opacity: 0.85; }
.quiz button.opt.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, var(--paper)); }
.quiz button.opt.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, var(--paper)); }
.quiz .fb { font-size: 0.86rem; margin-top: 0.7rem; display: none; }
.quiz .fb.show { display: block; }

.recall { border: 1px dashed var(--rule); border-radius: 6px; padding: 1.2rem 1.3rem; margin: 1.6rem 0; }
.recall .q { font-weight: 600; margin: 0 0 0.7rem; font-size: 1rem; }
.recall textarea {
  width: 100%; min-height: 5.5rem; font-family: var(--mono); font-size: 0.76rem;
  padding: 0.6rem; border: 1px solid var(--rule); border-radius: 4px;
  background: var(--paper); color: var(--ink); resize: vertical;
}
.recall button.reveal {
  font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em;
  background: var(--accent); color: var(--paper); border: 0; border-radius: 4px;
  padding: 0.45rem 0.9rem; margin-top: 0.6rem; cursor: pointer;
}
.recall .answer { display: none; margin-top: 0.9rem; font-size: 0.9rem; border-top: 1px solid var(--rule); padding-top: 0.8rem; }
.recall .answer.show { display: block; }

.score { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-soft); margin-top: 0.8rem; }

nav.lesson-nav { display: flex; flex-wrap: wrap; gap: 0.6rem 1.2rem; font-family: var(--mono); font-size: 0.7rem; margin-top: 3rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); }

.ask { background: var(--mark); border-radius: 6px; padding: 1rem 1.2rem; font-size: 0.9rem; margin: 2.5rem 0 0; }

.cards { display: grid; gap: 0.9rem; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); margin: 1.5rem 0; }
.card { border: 1px solid var(--rule); border-radius: 6px; padding: 0.9rem 1rem; text-decoration: none; color: inherit; display: block; }
.card:hover { border-color: var(--accent); }
.card .n { font-family: var(--mono); font-size: 0.62rem; color: var(--accent); letter-spacing: 0.12em; }
.card .t { font-weight: 600; font-size: 1rem; margin: 0.25rem 0 0.2rem; }
.card .d { font-size: 0.82rem; color: var(--ink-soft); }

/* --- inline SVG diagrams (generic; any lesson or reference card) --- */
.diagram { margin: 2rem 0 0.4rem; color: var(--ink); }
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .node { fill: var(--paper); stroke: currentColor; stroke-width: 1.2; }
.diagram .node-accent { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; }
.diagram .flow { stroke: currentColor; stroke-width: 1.2; fill: none; }
.diagram .flow-accent { stroke: var(--accent); stroke-width: 1.4; fill: none; }
.diagram .arrow { fill: currentColor; }
.diagram .arrow-accent { fill: var(--accent); }
.diagram .label { fill: currentColor; font-family: var(--mono); font-size: 10px; font-weight: 600; }
.diagram .label-small { fill: var(--ink-soft); font-family: var(--mono); font-size: 8px; letter-spacing: 0.06em; }
.diagram .label-accent { fill: var(--accent); font-family: var(--mono); font-size: 8px; letter-spacing: 0.06em; }
.caption { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-soft); margin: 0 0 2rem; }

/* --- source citation under a claim --- */
.cite-src { font-family: var(--mono); font-size: 0.66rem; color: var(--ink-soft); display: block; margin: -0.5rem 0 1.4rem; letter-spacing: 0.04em; }
.cite-src code { background: none; padding: 0; font-size: 1em; }

/* --- two-column compare block --- */
.compare { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); margin: 1.5rem 0; }
.compare > div { border: 1px solid var(--rule); border-radius: 6px; padding: 0.9rem 1rem; }
.compare h3 { margin: 0 0 0.4rem; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); }
.compare p { font-size: 0.86rem; margin: 0 0 0.6rem; }
.compare p:last-child { margin-bottom: 0; }

@page { size: A4; margin: 18mm 20mm; }

@media print {
  :root, :root:not([data-theme="light"]) {
    --ink: #000; --ink-soft: #444; --paper: #fff; --rule: #bbb;
    --accent: #6a2b0c; --accent-soft: #f3ece6; --mark: #f6efd0;
    --ok: #1c6b3f; --bad: #97231b;
  }
  body { padding: 0; font-size: 11pt; background: #fff; color: #000; }
  h2, h3 { break-after: avoid; }
  .diagram, .quiz, .callout, .compare > div { break-inside: avoid; }
  .quiz button.opt, .recall textarea, .recall button.reveal { display: none; }
  .recall .answer, .quiz .fb { display: block !important; }
  nav.lesson-nav, .ask { display: none; }
  a { color: #000; }
}