/* ============================================================
   Python for JS Devs — shared course stylesheet
   Light, Tufte-inspired, print-friendly. Linked by every lesson
   and reference doc so the course reads as one consistent whole.
   ============================================================ */

:root {
  --bg: #fbfaf7;
  --panel: #ffffff;
  --ink: #23201b;
  --ink-soft: #55504a;
  --ink-faint: #8a8378;
  --rule: #e7e2d8;
  --accent: #2f6f4f;      /* python-green, muted */
  --accent-soft: #e6f0ea;
  --js: #b8860b;          /* JS side (amber) */
  --js-soft: #f7efdb;
  --py: #2f6f4f;          /* PY side (green) */
  --py-soft: #e6f0ea;
  --warn: #b23b3b;
  --warn-soft: #f8e7e5;
  --code-bg: #f4f1ea;
  --code-ink: #2b2822;
  --shadow: 0 1px 2px rgba(30,25,15,.05), 0 6px 20px rgba(30,25,15,.06);
  --mono: "SF Mono", "JetBrains Mono", "Fira Code", ui-monospace, Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.6;
  padding: 0 1.2rem;
}

.wrap { max-width: 720px; margin: 0 auto; padding: 3.2rem 0 5rem; }

/* ---------- Header / meta ---------- */
.eyebrow {
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin: 0 0 .6rem;
}
h1 {
  font-size: 2.3rem;
  line-height: 1.12;
  margin: 0 0 .5rem;
  letter-spacing: -.01em;
}
.subtitle {
  font-family: var(--sans);
  color: var(--ink-soft);
  font-size: 1.02rem;
  margin: 0 0 1.4rem;
}
.lesson-meta {
  font-family: var(--sans);
  font-size: .82rem;
  color: var(--ink-faint);
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2rem;
}
.lesson-meta b { color: var(--ink-soft); font-weight: 600; }

/* ---------- Typography ---------- */
h2 {
  font-family: var(--sans);
  font-size: 1.35rem;
  margin: 2.6rem 0 .8rem;
  letter-spacing: -.01em;
  scroll-margin-top: 1rem;
}
h3 {
  font-family: var(--sans);
  font-size: 1.05rem;
  margin: 1.8rem 0 .5rem;
  color: var(--ink);
}
p { margin: .8rem 0; }
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-soft); }
a:hover { border-bottom-color: var(--accent); }
strong { font-weight: 700; }
em { font-style: italic; }
ul, ol { padding-left: 1.3rem; }
li { margin: .35rem 0; }

/* ---------- Code ---------- */
code {
  font-family: var(--mono);
  font-size: .82em;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: .1em .35em;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: .8rem;
  line-height: 1.55;
  box-shadow: var(--shadow);
}
pre code { background: none; padding: 0; font-size: 1em; color: var(--code-ink); }
.tok-com { color: #8a8378; font-style: italic; }
.tok-kw  { color: #a3306e; }
.tok-str { color: #2f6f4f; }
.tok-fn  { color: #2b5fa3; }
.tok-num { color: #b8860b; }

/* ---------- JS→PY side-by-side ---------- */
.sxs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .9rem;
  margin: 1.2rem 0;
}
@media (max-width: 620px) { .sxs { grid-template-columns: 1fr; } }
.sxs .col { border-radius: 10px; overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--rule); }
.sxs .col-head {
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .5rem .9rem;
}
.sxs .js  .col-head { background: var(--js-soft); color: var(--js); }
.sxs .py  .col-head { background: var(--py-soft); color: var(--py); }
.sxs pre { border: none; border-radius: 0; box-shadow: none; margin: 0; }

/* ---------- Callouts ---------- */
.callout {
  border-radius: 10px;
  padding: .9rem 1.1rem;
  margin: 1.3rem 0;
  font-size: .95rem;
  font-family: var(--sans);
  border: 1px solid var(--rule);
  background: var(--panel);
  box-shadow: var(--shadow);
}
.callout .tag {
  font-size: .68rem; font-weight: 800; letter-spacing: .12em;
  text-transform: uppercase; display: block; margin-bottom: .3rem;
}
.callout.tip     { background: var(--accent-soft); border-color: #cfe3d8; }
.callout.tip .tag{ color: var(--accent); }
.callout.warn    { background: var(--warn-soft); border-color: #eecccb; }
.callout.warn .tag{ color: var(--warn); }
.callout.js      { background: var(--js-soft); border-color: #ecdcae; }
.callout.js .tag { color: var(--js); }

/* ---------- Win box ---------- */
.win {
  border: 2px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  margin: 1.6rem 0;
  font-family: var(--sans);
}
.win h3 { margin: 0 0 .4rem; color: var(--accent); font-size: 1rem; }

/* ---------- Quiz ---------- */
.quiz {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 1.2rem 1.3rem;
  margin: 1.4rem 0;
  box-shadow: var(--shadow);
  font-family: var(--sans);
}
.quiz .q { font-weight: 600; margin: 0 0 .8rem; font-size: 1rem; }
.quiz .q .n { color: var(--accent); font-weight: 800; margin-right: .4rem; }
.quiz .opt {
  display: block; width: 100%; text-align: left;
  border: 1px solid var(--rule); background: #fff;
  border-radius: 8px; padding: .6rem .8rem; margin: .4rem 0;
  font: inherit; font-size: .92rem; cursor: pointer;
  transition: background .12s, border-color .12s;
}
.quiz .opt:hover { border-color: var(--accent); background: var(--accent-soft); }
.quiz .opt.correct { border-color: var(--accent); background: var(--accent-soft); }
.quiz .opt.wrong { border-color: var(--warn); background: var(--warn-soft); }
.quiz .fb {
  margin-top: .6rem; font-size: .88rem; color: var(--ink-soft);
  padding: .6rem .8rem; border-radius: 8px; background: var(--code-bg);
  display: none;
}
.quiz .fb.show { display: block; }

/* ---------- Nav / footer ---------- */
.nav {
  display: flex; justify-content: space-between; gap: 1rem;
  margin-top: 3rem; padding-top: 1.4rem; border-top: 1px solid var(--rule);
  font-family: var(--sans); font-size: .9rem;
}
.source {
  font-family: var(--sans);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: .9rem 1.1rem;
  margin: 1.6rem 0;
  font-size: .92rem;
}
.source .tag { font-size: .68rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); display:block; margin-bottom:.3rem;}
.ask {
  font-family: var(--sans); font-size: .9rem; color: var(--ink-soft);
  text-align: center; margin-top: 2.4rem; padding: 1rem;
  background: var(--accent-soft); border-radius: 10px;
}

/* ---------- Print ---------- */
@media print {
  body { background: #fff; font-size: 11pt; }
  .quiz .opt { cursor: default; }
  pre, .callout, .quiz, .source { box-shadow: none; }
  .nav, .ask { display: none; }
}