/* Shared stylesheet for the Playwright course.
   Tufte-inspired: readable measure, generous margins, prints well.
   Every lesson links this file so the course looks like one consistent whole. */

:root {
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --paper: #fdfcf9;
  --rule: #e2ddd2;
  --accent: #1F467D;
  --accent-soft: #eaf5ee;
  --code-bg: #f4f1ea;
  --warn-bg: #fdf3e7;
  --warn-border: #e0a44a;
  --measure: 40rem;
  --serif: "Aptos", "Segoe UI", Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Fira Code", ui-monospace, 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: 3rem 1.5rem 6rem;
}

.page {
  max-width: var(--measure);
  margin: 0 auto;
}

/* ---- Course furniture ---- */

.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-size: 2.1rem;
  line-height: 1.15;
  margin: 0 0 0.6rem;
  font-weight: 600;
}

h2 {
  font-size: 1.4rem;
  margin: 2.6rem 0 0.6rem;
  font-weight: 600;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.3rem;
}

h3 { font-size: 1.1rem; margin: 1.8rem 0 0.4rem; }

p, li { color: var(--ink); }
.lede { font-size: 1.15rem; color: var(--ink-soft); }

a { color: var(--accent); text-underline-offset: 2px; }

small, .fine { color: var(--ink-soft); font-size: 0.85rem; }

/* ---- Code ---- */

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
}

pre code { background: none; padding: 0; font-size: inherit; }

.cmd {
  background: #1e1e1e;
  color: #e8e8e8;
  border: none;
}
.cmd code { color: #e8e8e8; }
.cmd .prompt { color: var(--accent); user-select: none; }

/* ---- Callouts ---- */

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.8rem 1rem;
  border-radius: 0 6px 6px 0;
  margin: 1.4rem 0;
}

.callout.warn {
  border-left-color: var(--warn-border);
  background: var(--warn-bg);
}

.callout .tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.25rem;
  color: var(--accent);
}
.callout.warn .tag { color: #b9772a; }

/* ---- Numbered steps ---- */

.step {
  display: flex;
  gap: 0.9rem;
  margin: 1.2rem 0;
  align-items: baseline;
}
.step .n {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 50%;
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
}
.step .body { flex: 1 1 auto; }
.step .body > :first-child { margin-top: 0; }

/* ---- Key concept table ---- */

.rhythm {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.92rem;
}
.rhythm th, .rhythm td {
  text-align: left;
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.rhythm th { color: var(--accent); font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; }
.rhythm code { font-size: 0.82em; }

/* ---- Footer nav ---- */

.lesson-nav {
  margin-top: 3.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  font-size: 0.9rem;
}

.ask-teacher {
  margin-top: 2.5rem;
  padding: 1rem 1.2rem;
  border: 1px dashed var(--accent);
  border-radius: 8px;
  background: var(--accent-soft);
  font-size: 0.95rem;
}
.ask-teacher strong { color: var(--accent); }

/* ---- Print ---- */
@media print {
  body { background: #fff; padding: 0; font-size: 12pt; }
  .quiz-controls, .lesson-nav { display: none; }
  pre, .callout { break-inside: avoid; }
  a { color: var(--ink); text-decoration: none; }
}