/* Shared lesson stylesheet — links from every lesson & reference doc.
   Tufte-inspired: generous margins, readable measure, restrained palette. */

:root {
  --ink:        #1a1a1a;
  --ink-soft:   #5b5b5b;
  --paper:      #fdfdfb;
  --rule:       #e4e2da;
  --accent:     #2b6cb0;   /* k8s-ish blue */
  --accent-2:   #b0420f;   /* terracotta for warnings/why */
  --code-bg:    #f4f3ee;
  --good:       #2f7a43;
  --bad:        #b0301f;
  --measure:    42rem;
  --serif: Charter, "Iowan Old Style", Palatino, Georgia, serif;
  --mono:  "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { font-size: 18px; }

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

.lesson, .doc {
  max-width: var(--measure);
  margin: 0 auto;
}

/* ---- Masthead ---- */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.4rem;
}
h1 {
  font-weight: 600;
  font-size: 2.1rem;
  line-height: 1.12;
  margin: 0 0 0.6rem;
}
.lede {
  font-size: 1.12rem;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
}
.mission-tie {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 0 0.5rem 1rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
  background: linear-gradient(90deg, rgba(43,108,176,0.05), transparent);
}

h2 {
  font-weight: 600;
  font-size: 1.4rem;
  margin: 2.4rem 0 0.7rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--rule);
}
h3 { font-weight: 600; font-size: 1.08rem; margin: 1.6rem 0 0.4rem; }

p { margin: 0.7rem 0; }
strong { font-weight: 600; }
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(43,108,176,0.3); }
a:hover { border-bottom-color: var(--accent); }

/* ---- Code ---- */
code {
  font-family: var(--mono);
  font-size: 0.84em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.5;
  background: #1f1d1a;
  color: #f4f3ee;
  padding: 1rem 1.1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0.8rem 0;
}
pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
pre .c  { color: #8d8a82; }          /* comment   */
pre .p  { color: #d99a4e; }          /* prompt $   */
pre .k  { color: #7fb3e0; }          /* keyword    */

/* ---- Steps ---- */
.step {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.4rem 0.9rem;
  margin: 1.3rem 0;
}
.step .n {
  font-family: var(--mono);
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  width: 1.7rem; height: 1.7rem;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 0.85rem;
}
.step .body { min-width: 0; }
.step h3 { margin-top: 0.1rem; }

/* ---- Callouts ---- */
.callout {
  border-radius: 6px;
  padding: 0.8rem 1rem;
  margin: 1.1rem 0;
  font-size: 0.95rem;
}
.callout .tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.25rem;
}
.callout.why    { background: rgba(176,66,15,0.07);  border-left: 3px solid var(--accent-2); }
.callout.why .tag    { color: var(--accent-2); }
.callout.note   { background: rgba(43,108,176,0.07); border-left: 3px solid var(--accent); }
.callout.note .tag   { color: var(--accent); }
.callout.gotcha { background: rgba(176,48,31,0.07);  border-left: 3px solid var(--bad); }
.callout.gotcha .tag { color: var(--bad); }

/* ---- Diagram (CSS boxes) ---- */
.diagram {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.2rem;
  margin: 1.4rem 0;
  background: #fff;
  font-family: var(--mono);
  font-size: 0.78rem;
}
.layer {
  border: 1.5px dashed var(--ink-soft);
  border-radius: 6px;
  padding: 0.7rem 0.9rem;
  margin: 0.5rem 0;
}
.layer .label { color: var(--ink-soft); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; }
.box {
  display: inline-block;
  border: 1.5px solid var(--accent);
  border-radius: 5px;
  background: rgba(43,108,176,0.06);
  padding: 0.35rem 0.6rem;
  margin: 0.3rem 0.3rem 0 0;
}
.arrow { text-align: center; color: var(--ink-soft); font-size: 1.1rem; margin: 0.15rem 0; }

/* ---- Primary source ---- */
.primary-source {
  border: 1px solid var(--rule);
  border-left: 4px solid var(--good);
  border-radius: 6px;
  padding: 0.9rem 1.1rem;
  margin: 1.6rem 0;
  background: #fff;
}
.primary-source .tag { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--good); }

/* ---- Footer nav ---- */
.lesson-footer {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 2px solid var(--rule);
  font-size: 0.92rem;
}
.ask-teacher {
  background: rgba(43,108,176,0.06);
  border-radius: 6px;
  padding: 0.8rem 1rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}
.nav-row { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1.2rem; }
.nav-row a { font-family: var(--mono); font-size: 0.82rem; }

/* ---- Quiz (pairs with assets/quiz.js) ---- */
.quiz {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.1rem 1.2rem;
  margin: 1.6rem 0;
  background: #fff;
}
.quiz::before {
  content: "Retrieval check";
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.quiz .q { font-weight: 600; margin: 0.5rem 0 0.8rem; }
.quiz .opts { list-style: none; padding: 0; margin: 0; }
.quiz .opts li {
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 0.55rem 0.8rem;
  margin: 0.4rem 0;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.quiz .opts li:hover:not(.locked) { border-color: var(--accent); background: rgba(43,108,176,0.04); }
.quiz .opts li.locked { cursor: default; }
.quiz .opts li.chosen-correct,
.quiz .opts li.is-correct { border-color: var(--good); background: rgba(47,122,67,0.1); }
.quiz .opts li.chosen-wrong { border-color: var(--bad); background: rgba(176,48,31,0.1); }
.quiz .opts li.is-correct::after { content: " ✓"; color: var(--good); font-weight: 700; }
.quiz .opts li.chosen-wrong::after { content: " ✗"; color: var(--bad); font-weight: 700; }
.quiz .explain {
  margin: 0.8rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--rule);
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* ---- Print ---- */
@media print {
  body { padding: 0; font-size: 12pt; background: #fff; }
  pre { background: #f4f3ee; color: #1a1a1a; border: 1px solid #ccc; }
  pre .c { color: #777; } pre .p { color: #a05a1e; } pre .k { color: #2b6cb0; }
  .quiz, .ask-teacher { break-inside: avoid; }
  a { color: var(--ink); border: none; }
}