:root {
  --bg: #fbfdfc;
  --ink: #16201c;
  --muted: #5c6b65;
  --jade: #1f7a63;
  --jade-dark: #145744;
  --line: #e2ece8;
  --card: #ffffff;
  --prompt-bg: #f0f7f4;
  --max: 46rem;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg);
  line-height: 1.65; font-size: 18px;
}
a { color: var(--jade-dark); }

/* header / footer */
header.site, footer.site {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max); margin: 0 auto; padding: 1.1rem 1.25rem;
}
header.site { border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--ink); }
.brand span { color: var(--jade); }
header.site nav a { text-decoration: none; color: var(--muted); font-weight: 600; font-size: .95rem; }
footer.site { border-top: 1px solid var(--line); margin-top: 4rem; color: var(--muted); font-size: .9rem; }

main { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* hero */
.hero { padding: 3.5rem 0 2rem; }
.hero h1 { font-size: 2.5rem; line-height: 1.12; letter-spacing: -.02em; margin: 0 0 1rem; }
.hero h1 em { color: var(--jade); font-style: normal; }
.lede { font-size: 1.2rem; color: var(--muted); margin: 0 0 1.75rem; }
.cta {
  display: inline-block; background: var(--jade); color: #fff; text-decoration: none;
  font-weight: 700; padding: .7rem 1.3rem; border-radius: 10px;
}
.cta:hover { background: var(--jade-dark); }

/* tracks + lesson list */
.tracks { padding-top: 1rem; }
.track { margin: 2.5rem 0; }
.track h2 { font-size: 1.5rem; margin: 0 0 .25rem; }
.track-blurb { color: var(--muted); margin: 0 0 1rem; }
.lesson-list { list-style: none; margin: 0; padding: 0; }
.lesson-list li { margin: .6rem 0; }
.lesson-list a {
  display: flex; gap: 1rem; align-items: center; text-decoration: none; color: inherit;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: .9rem 1.1rem;
  transition: border-color .15s, transform .15s;
}
.lesson-list a:hover { border-color: var(--jade); transform: translateY(-1px); }
.lesson-num {
  flex: none; width: 2rem; height: 2rem; display: grid; place-items: center;
  background: var(--prompt-bg); color: var(--jade-dark); font-weight: 700; border-radius: 8px;
}
.lesson-meta { display: flex; flex-direction: column; }
.lesson-meta em { color: var(--muted); font-style: normal; font-size: .95rem; }

/* lesson page */
.lesson-wrap { padding-top: 2rem; }
.crumb { color: var(--muted); font-size: .9rem; }
.crumb a { color: var(--muted); }
.badge { display: inline-block; font-size: .8rem; font-weight: 700; padding: .1rem .5rem; border-radius: 6px; }
.badge.scratch { background: #e8f5ef; color: var(--jade-dark); }
.badge.intermediate { background: #fff3e0; color: #9a5b00; }
.badge.power { background: #ede7ff; color: #4b35a8; }
.lesson h1 { font-size: 2.1rem; line-height: 1.15; letter-spacing: -.02em; margin: .4rem 0 1.25rem; }
.lesson h2 { font-size: 1.35rem; margin: 2rem 0 .5rem; }
.lesson p { margin: 1rem 0; }
.lesson ul, .lesson ol { padding-left: 1.3rem; }

/* the copy-paste prompt cards (markdown blockquotes) */
.lesson blockquote {
  margin: 1.25rem 0; padding: 1rem 1.1rem; background: var(--prompt-bg);
  border: 1px solid var(--line); border-left: 4px solid var(--jade); border-radius: 10px;
  font-family: var(--mono); font-size: .95rem; color: var(--jade-dark); line-height: 1.55;
}
.lesson blockquote p { margin: .3rem 0; }
.lesson code {
  font-family: var(--mono); font-size: .9em; background: #eef4f1; padding: .1rem .35rem; border-radius: 5px;
}
.lesson pre { background: #0f1f1a; color: #d7efe6; padding: 1rem; border-radius: 10px; overflow-x: auto; }
.lesson pre code { background: none; padding: 0; }

/* prev / next */
.prevnext { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.prevnext a { text-decoration: none; font-weight: 600; color: var(--jade-dark); }
.prevnext .next { margin-left: auto; text-align: right; }

@media (max-width: 600px) {
  body { font-size: 17px; }
  .hero h1 { font-size: 2rem; }
}