/* Shared lesson stylesheet — public-url teaching workspace.
   Tufte-inspired: readable measure, generous margins, restrained palette.
   Linked by every lesson and reference doc so the course looks like one thing. */

:root {
  --ink: #1a1a1a;
  --paper: #fdfcf9;
  --muted: #6b6b6b;
  --rule: #e3e0d8;
  --accent: #b7410e;      /* rust/terracotta */
  --accent-soft: #f6e9e2;
  --link: #1d6fa5;
  --code-bg: #f4f2ec;
  --good: #2e7d32;
  --warn: #b26a00;
  --measure: 38rem;
}

* { box-sizing: border-box; }

html { font-size: 18px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: et-book, Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
}

/* ---- Masthead ---- */
.eyebrow {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.6rem;
}
h1 {
  font-weight: 400;
  font-size: 2.1rem;
  line-height: 1.15;
  margin: 0 0 0.4rem;
}
.dek {
  font-style: italic;
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.4rem;
}
.masthead { border-bottom: 1px solid var(--rule); padding-bottom: 1.4rem; margin-bottom: 2rem; }

h2 {
  font-weight: 400;
  font-size: 1.4rem;
  margin: 2.6rem 0 0.8rem;
  padding-top: 0.4rem;
}
h3 { font-weight: 600; font-size: 1.02rem; margin: 1.6rem 0 0.4rem; }

p, li { font-size: 1.02rem; }
a { color: var(--link); text-decoration: none; border-bottom: 1px solid rgba(29,111,165,0.3); }
a:hover { border-bottom-color: var(--link); }

/* ---- Step list ---- */
ol.steps { counter-reset: step; list-style: none; padding-left: 0; }
ol.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 2.6rem;
  margin-bottom: 1.3rem;
}
ol.steps > li::before {
  content: counter(step);
  position: absolute; left: 0; top: -0.1rem;
  width: 1.7rem; height: 1.7rem;
  background: var(--accent); color: #fff;
  border-radius: 50%;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.85rem;
  display: flex; align-items: center; justify-content: center;
}

/* ---- Code ---- */
code {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  background: var(--code-bg);
  border-left: 3px solid var(--accent);
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  border-radius: 4px;
  font-size: 0.82rem;
  line-height: 1.5;
}
pre code { background: none; padding: 0; font-size: inherit; }
.cmd { color: var(--muted); }            /* shell prompt $ */
.out { color: var(--muted); font-style: italic; }

/* ---- Callouts ---- */
.note, .warn, .win {
  border-radius: 5px;
  padding: 0.8rem 1rem;
  margin: 1.4rem 0;
  font-size: 0.95rem;
}
.note { background: #eef4f8; border-left: 3px solid var(--link); }
.warn { background: #fbf2e3; border-left: 3px solid var(--warn); }
.win  { background: var(--accent-soft); border-left: 3px solid var(--accent); }
.note strong, .warn strong, .win strong { display: block; margin-bottom: 0.2rem; }

/* ---- Tables (comparison / reference) ---- */
table { border-collapse: collapse; width: 100%; margin: 1.4rem 0; font-size: 0.86rem; }
th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
thead th { border-bottom: 2px solid var(--ink); font-weight: 600; }
tbody tr:first-child td { border-top: none; }
td.yes { color: var(--good); }
td.no  { color: var(--accent); }

/* ---- Quiz widget ---- */
.quiz { border: 1px solid var(--rule); border-radius: 6px; padding: 1.1rem 1.2rem; margin: 1.6rem 0; background: #fff; }
.quiz .q { font-weight: 600; margin-bottom: 0.7rem; }
.quiz button {
  display: block; width: 100%; text-align: left;
  background: var(--paper); border: 1px solid var(--rule); border-radius: 4px;
  padding: 0.55rem 0.8rem; margin: 0.35rem 0;
  font: inherit; font-size: 0.95rem; cursor: pointer;
  transition: background 0.12s;
}
.quiz button:hover { background: var(--accent-soft); }
.quiz button.correct { background: #e4f2e4; border-color: var(--good); }
.quiz button.wrong { background: #f8e3da; border-color: var(--accent); }
.quiz .feedback { margin-top: 0.7rem; font-size: 0.92rem; min-height: 1.2rem; }

/* ---- Footer nav ---- */
.ask { background: var(--accent-soft); border-radius: 6px; padding: 1rem 1.2rem; margin: 2.4rem 0 1.2rem; font-size: 0.95rem; }
.nav { display: flex; justify-content: space-between; border-top: 1px solid var(--rule); padding-top: 1.2rem; margin-top: 2.4rem; font-size: 0.9rem; }
.source { font-size: 0.95rem; }
.muted { color: var(--muted); }

/* ---- Print ---- */
@media print {
  body { background: #fff; }
  .wrap { max-width: 100%; padding: 0; }
  .quiz button, .ask { display: none; }
  pre { white-space: pre-wrap; }
  a { color: var(--ink); border: none; }
}