/* Shared stylesheet for every lesson and reference document in this workspace.
   Tufte-ish: one column, generous margins, sidenotes, print-friendly. */

:root {
  --ink: #1a1a1a;
  --ink-soft: #555;
  --rule: #d8d3c8;
  --paper: #fffef9;
  --accent: #8b2e2e;
  --accent-soft: #f6ecec;
  --ok: #1f6b3a;
  --ok-soft: #e9f4ec;
  --bad: #9b1c1c;
  --bad-soft: #fbeaea;
  --code-bg: #f4f2ec;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Noto Serif KR", serif;
  --sans: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  --mono: "SFMono-Regular", Menlo, Consolas, "D2Coding", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
  max-width: 46rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.65;
  word-break: keep-all;
}

h1, h2, h3, .kicker, table, .card-title { font-family: var(--sans); }

h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 .3rem; font-weight: 650; }
h2 {
  font-size: 1.2rem; margin: 3rem 0 .8rem; font-weight: 650;
  border-bottom: 1px solid var(--rule); padding-bottom: .35rem;
}
h3 { font-size: 1rem; margin: 1.8rem 0 .4rem; font-weight: 650; }

.kicker {
  font-size: .72rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 1.2rem;
}
.subtitle { color: var(--ink-soft); font-style: italic; margin: 0 0 2rem; }

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--rule); }
a:hover { border-bottom-color: var(--accent); }

code, pre { font-family: var(--mono); font-size: .86em; }
code { background: var(--code-bg); padding: .1em .35em; border-radius: 3px; }
pre {
  background: var(--code-bg); padding: .9rem 1.1rem; border-radius: 5px;
  border-left: 3px solid var(--rule); overflow-x: auto; line-height: 1.5;
}
pre code { background: none; padding: 0; }

table { border-collapse: collapse; width: 100%; font-size: .9rem; margin: 1rem 0; }
th, td { text-align: left; padding: .45rem .6rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 650; font-size: .8rem; letter-spacing: .03em; text-transform: uppercase; color: var(--ink-soft); }
tbody tr:nth-child(even) { background: rgba(0,0,0,.018); }

blockquote, .note {
  margin: 1.2rem 0; padding: .8rem 1.1rem;
  background: var(--accent-soft); border-left: 3px solid var(--accent);
  font-size: .95rem;
}
.note strong { font-family: var(--sans); }

.warn { background: var(--bad-soft); border-left-color: var(--bad); }
.win  { background: var(--ok-soft);  border-left-color: var(--ok); }

.grid { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
.card { border: 1px solid var(--rule); border-radius: 5px; padding: .8rem 1rem; background: #fff; }
.card-title { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin-bottom: .3rem; }

.pill {
  display: inline-block; font-family: var(--sans); font-size: .72rem;
  padding: .1rem .5rem; border: 1px solid var(--rule); border-radius: 999px; color: var(--ink-soft);
}

footer {
  margin-top: 4rem; padding-top: 1rem; border-top: 1px solid var(--rule);
  font-size: .85rem; color: var(--ink-soft);
}
.citations { font-size: .82rem; color: var(--ink-soft); }
.citations li { margin-bottom: .3rem; }

/* --- quiz widget (assets/quiz.js) --- */
.quiz { margin: 1.5rem 0; }
.q {
  border: 1px solid var(--rule); border-radius: 6px; background: #fff;
  padding: 1rem 1.2rem; margin-bottom: .9rem;
}
.q-head { display: flex; gap: .6rem; align-items: baseline; margin-bottom: .7rem; }
.q-num { font-family: var(--sans); font-size: .75rem; color: var(--accent); letter-spacing: .08em; }
.q-text { font-weight: 600; }
.q-text code { font-weight: 400; }
.opts { list-style: none; margin: 0; padding: 0; display: grid; gap: .35rem; }
.opt {
  display: block; width: 100%; text-align: left; cursor: pointer;
  font-family: var(--sans); font-size: .92rem;
  padding: .5rem .7rem; border: 1px solid var(--rule); border-radius: 4px;
  background: #fdfdfa; color: var(--ink);
}
.opt:hover:not([disabled]) { border-color: var(--accent); }
.opt[disabled] { cursor: default; }
.opt.correct { background: var(--ok-soft); border-color: var(--ok); }
.opt.wrong { background: var(--bad-soft); border-color: var(--bad); }
.why {
  margin-top: .7rem; font-size: .9rem; padding: .6rem .8rem;
  border-radius: 4px; background: var(--code-bg); display: none;
}
.why.show { display: block; }
.scorebar {
  position: sticky; bottom: 0; margin-top: 1.5rem; padding: .7rem 1rem;
  background: #fff; border: 1px solid var(--rule); border-radius: 6px;
  font-family: var(--sans); font-size: .9rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.scorebar button {
  font-family: var(--sans); font-size: .82rem; padding: .35rem .7rem;
  border: 1px solid var(--rule); border-radius: 4px; background: #fdfdfa; cursor: pointer;
}

@media print {
  body { padding: 0; max-width: none; font-size: 10.5pt; background: #fff; }
  h2 { page-break-after: avoid; }
  pre, table, .q, .card { page-break-inside: avoid; }
  .scorebar, .opt:hover { display: none; }
  a { color: var(--ink); border: none; }
  .why { display: block; }
}