:root {
  --bg: #0a120d;
  --panel: #101c15;
  --panel-2: #16261d;
  --border: #233327;
  --text: #eaf2ec;
  --muted: #9fb3a6;
  --accent: #4fae6e;
  --accent-ink: #06160c;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

a { color: var(--accent); }

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

header.site {
  border-bottom: 1px solid var(--border);
  padding: 1.1rem 0;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; max-width: 920px; }
header.site a.brand { color: var(--text); font-weight: 800; font-size: 1.05rem; text-decoration: none; letter-spacing: -0.01em; }
header.site nav a { color: var(--muted); text-decoration: none; font-size: .92rem; margin-left: 1.25rem; }
header.site nav a:hover { color: var(--text); }

main { max-width: 920px; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }
main.article { max-width: 720px; }

h1 { font-size: 2rem; line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 .6rem; }
h2 { font-size: 1.4rem; margin: 2.1rem 0 .6rem; letter-spacing: -0.005em; }
h3 { font-size: 1.1rem; margin: 1.6rem 0 .4rem; }
p { margin: 0 0 1rem; color: var(--text); }
p.lede { color: var(--muted); font-size: 1.08rem; }

.meta { color: var(--muted); font-size: .85rem; margin-bottom: 1.75rem; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.25rem; text-decoration: none; color: var(--text); display: block;
}
.card:hover { border-color: var(--accent); }
.card .tag { display: inline-block; font-size: .72rem; text-transform: uppercase; letter-spacing: .04em; color: var(--accent); margin-bottom: .4rem; font-weight: 700; }
.card h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.card p { color: var(--muted); font-size: .9rem; margin: 0; }

.cta {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.5rem; margin: 2.25rem 0; text-align: center;
}
.cta h3 { margin-top: 0; }
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink); font-weight: 700;
  text-decoration: none; padding: .7rem 1.3rem; border-radius: 9px; margin-top: .5rem;
}

footer.site { border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; padding: 2rem 0; margin-top: 3rem; }
footer.site .wrap { max-width: 920px; }

/* Curriculum module nav (breadcrumb + prev/next) */
.module-crumb { font-size: .85rem; color: var(--muted); margin-bottom: 1rem; }
.module-crumb a { color: var(--muted); text-decoration: none; }
.module-crumb a:hover { color: var(--accent); }
.lesson-pager {
  display: flex; justify-content: space-between; gap: 1rem; margin: 2.5rem 0 0;
  border-top: 1px solid var(--border); padding-top: 1.25rem;
}
.lesson-pager a { color: var(--text); text-decoration: none; font-size: .9rem; max-width: 46%; }
.lesson-pager a .dir { display: block; color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .04em; margin-bottom: .2rem; }
.lesson-pager a:hover .label { color: var(--accent); }
.lesson-pager .next { text-align: right; margin-left: auto; }

/* Commonly Corrected callout - amber accent, distinct from green CTA */
.corrected {
  background: var(--panel); border: 1px solid #4a3a1e; border-left: 4px solid #d9a441;
  border-radius: 10px; padding: 1.1rem 1.25rem; margin: 1.1rem 0 1.75rem;
}
.corrected .corrected-label {
  display: flex; align-items: center; gap: .5rem; font-size: .76rem; text-transform: uppercase;
  letter-spacing: .05em; font-weight: 700; color: #d9a441; margin-bottom: .55rem;
}
.corrected ul { margin: 0; padding-left: 1.1rem; }
.corrected li { margin-bottom: .6rem; color: var(--text); }
.corrected li:last-child { margin-bottom: 0; }
.corrected li strong { color: #e8c37c; }

/* Gear / affiliate recommendation box */
.gear {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px;
  padding: 1.1rem 1.25rem; margin: 1.5rem 0;
}
.gear .gear-label {
  display: block; font-size: .76rem; text-transform: uppercase; letter-spacing: .05em;
  font-weight: 700; color: var(--muted); margin-bottom: .6rem;
}
.gear ul { margin: 0; padding-left: 0; list-style: none; }
.gear li { margin-bottom: .5rem; }
.gear li:last-child { margin-bottom: 0; }
.gear a.gear-link { color: var(--text); text-decoration: none; border-bottom: 1px dotted var(--muted); }
.gear a.gear-link:hover { color: var(--accent); border-color: var(--accent); }
.gear .gear-note { color: var(--muted); font-size: .78rem; margin-top: .75rem; }

/* Curriculum hub module list */
.module-list { list-style: none; margin: 1.5rem 0; padding: 0; counter-reset: modnum; }
.module-list > li {
  counter-increment: modnum; background: var(--panel); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.25rem 1.4rem; margin-bottom: 1rem;
}
.module-list h3 { margin: 0 0 .4rem; font-size: 1.1rem; }
.module-list h3::before { content: "Module " counter(modnum) " \2014 "; color: var(--accent); font-weight: 700; }
.module-list p { color: var(--muted); margin: 0 0 .7rem; font-size: .92rem; }
.module-list .lesson-links { display: flex; flex-wrap: wrap; gap: .5rem; }
.module-list .lesson-links a {
  font-size: .82rem; color: var(--text); background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 20px; padding: .3rem .8rem; text-decoration: none;
}
.module-list .lesson-links a:hover { border-color: var(--accent); color: var(--accent); }
.module-list .soon { font-size: .78rem; color: var(--muted); font-style: italic; }

@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  main { padding-top: 1.75rem; }
  .lesson-pager { flex-direction: column; gap: .75rem; }
  .lesson-pager a { max-width: 100%; }
  .lesson-pager .next { text-align: left; margin-left: 0; }
}