/* Agentic Engineering Curriculum — AISOFT-styled docs site */
:root {
  --primary: #9e3d00;
  --primary-container: #c64f00;
  --primary-fixed: #ffdbcd;
  --surface: #fcf9f8;
  --surface-low: #f6f3f2;
  --surface-container: #f0edec;
  --surface-lowest: #ffffff;
  --on-surface: #1c1b1b;
  --on-surface-variant: #594238;
  --on-secondary-container: #656464;
  --outline-variant: #e0c0b2;
  --code-bg: #1c1614;
  --code-fg: #f3eee9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #ff7a30;
    --primary-container: #ffa063;
    --primary-fixed: #7c2e00;
    --surface: #111110;
    --surface-low: #1a1a19;
    --surface-container: #211f1e;
    --surface-lowest: #0a0a09;
    --on-surface: #f0eeed;
    --on-surface-variant: #d8c3b9;
    --on-secondary-container: #c5c3c2;
    --outline-variant: #4a3a33;
  }
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--surface); color: var(--on-surface);
  line-height: 1.7; -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: 'Manrope', 'Inter', sans-serif; line-height: 1.2; }
a { color: var(--primary); }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--outline-variant);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto; padding: 16px 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-logo {
  font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 17px;
  letter-spacing: -0.02em; color: var(--on-surface); text-decoration: none;
}
.nav-logo span { color: var(--primary); }
.nav-links { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }
.nav-links a {
  font-size: 14px; font-weight: 600; color: var(--on-surface-variant);
  text-decoration: none; transition: color .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-cta {
  background: var(--primary); color: #fff !important; padding: 8px 18px;
  border-radius: 100px; font-size: 13px;
}
.nav-cta:hover { background: var(--primary-container); }

/* layout */
.wrap { max-width: 800px; margin: 0 auto; padding: 80px 32px 120px; }
.wrap-wide { max-width: 1100px; margin: 0 auto; padding: 80px 32px 120px; }

/* hero */
.hero { text-align: left; margin-bottom: 72px; }
.eyebrow {
  font-family: 'Manrope', sans-serif; font-size: 11px; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--primary);
  margin-bottom: 18px;
}
.hero h1 {
  font-weight: 800; font-size: clamp(34px, 5vw, 52px);
  letter-spacing: -0.02em; line-height: 1.08; margin-bottom: 28px;
}
.thesis {
  font-size: 20px; line-height: 1.6; color: var(--on-surface-variant);
  padding: 24px 28px; background: var(--surface-low);
  border-left: 3px solid var(--primary); border-radius: 0 14px 14px 0;
}
.thesis strong { color: var(--on-surface); }
.hero-sub { font-size: 17px; color: var(--on-surface-variant); margin-top: 28px; max-width: 60ch; }

/* section */
section { margin-bottom: 72px; }
h2.sec {
  font-size: 13px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--on-surface-variant); margin-bottom: 28px;
  padding-bottom: 12px; border-bottom: 1px solid var(--outline-variant);
}

/* the fork — vibe coding vs agentic engineering */
.fork { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 640px) { .fork { grid-template-columns: 1fr; } }
.fork-col {
  padding: 28px; border-radius: 16px;
  border: 1px solid var(--outline-variant); background: var(--surface-lowest);
}
.fork-col.lesser { background: var(--surface-low); }
.fork-col.path { border-color: var(--primary); box-shadow: 0 1px 0 var(--primary), 0 12px 32px rgba(158,61,0,0.07); }
.fork-label {
  font-family: 'Manrope', sans-serif; font-size: 10.5px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 4px;
}
.fork-col.lesser .fork-label { color: var(--on-secondary-container); }
.fork-col.path .fork-label { color: var(--primary); }
.fork-col h3 { font-size: 18px; font-weight: 700; margin-bottom: 16px; }
.fork-col ul { list-style: none; margin: 0; padding: 0; }
.fork-col li {
  padding: 10px 0; border-top: 1px solid var(--outline-variant);
  font-size: 14.5px; line-height: 1.5;
}
.fork-col li:first-child { border-top: 0; }
.fork-col.lesser li { color: var(--on-surface-variant); }
.fork-col li b { font-weight: 700; }
.fork-col.lesser li b { color: var(--on-surface-variant); }
.fork-col.path li b { color: var(--primary); }
.fork-foot { margin-top: 16px; font-size: 13.5px; font-weight: 700; }
.fork-col.lesser .fork-foot { color: var(--on-secondary-container); }
.fork-col.path .fork-foot { color: var(--primary); }

/* module list */
.modules { display: grid; gap: 16px; }
.module {
  display: grid; grid-template-columns: 56px 1fr; gap: 20px;
  padding: 24px; background: var(--surface-lowest);
  border: 1px solid var(--outline-variant); border-radius: 14px;
  text-decoration: none; color: inherit;
  transition: border-color .15s, transform .15s;
}
.module:hover { border-color: var(--primary); transform: translateY(-1px); }
.module:hover h3 { color: var(--primary); }
.module .num {
  font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 22px;
  color: var(--primary);
}
.module h3 { font-size: 18px; font-weight: 700; margin-bottom: 6px; color: var(--on-surface); transition: color .15s; }
.module p { font-size: 14.5px; color: var(--on-surface-variant); margin: 0; }

/* artifact cards */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }
.card {
  padding: 26px; background: var(--surface-lowest);
  border: 1px solid var(--outline-variant); border-radius: 14px;
  text-decoration: none; color: inherit; display: block;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--primary); transform: translateY(-2px); }
.card .tag {
  font-family: 'Manrope', sans-serif; font-size: 10.5px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--primary);
}
.card h3 { font-size: 17px; font-weight: 700; margin: 10px 0 8px; }
.card p { font-size: 14px; color: var(--on-surface-variant); margin: 0; }

/* prose (curriculum page) */
.prose h2 {
  font-size: 26px; font-weight: 800; letter-spacing: -0.01em;
  margin: 64px 0 8px; padding-top: 32px; border-top: 1px solid var(--outline-variant);
}
.prose h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }
.prose h3 { font-size: 19px; font-weight: 700; margin: 36px 0 12px; }
.prose p { font-size: 16.5px; margin: 0 0 18px; }
.prose ul, .prose ol { margin: 0 0 24px 24px; }
.prose li { font-size: 16px; margin-bottom: 8px; }
.prose strong { color: var(--on-surface); font-weight: 700; }
.prose em { color: var(--on-surface-variant); }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.prose code {
  font-family: 'SF Mono', 'Fira Code', ui-monospace, monospace; font-size: 13.5px;
  background: var(--surface-container); padding: 2px 7px; border-radius: 5px;
}
.prose blockquote {
  border-left: 3px solid var(--primary); padding: 4px 0 4px 22px;
  margin: 24px 0; color: var(--on-surface-variant); font-style: italic;
}
.prose blockquote p { font-size: 16px; }
.prose hr { border: 0; border-top: 1px solid var(--outline-variant); margin: 48px 0; }
.callout {
  background: var(--surface-low); border: 1px solid var(--outline-variant);
  border-radius: 12px; padding: 18px 22px; margin: 24px 0;
}
.callout p { margin: 0; font-size: 15px; }
.callout .label {
  font-family: 'Manrope', sans-serif; font-size: 11px; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--primary);
  display: block; margin-bottom: 6px;
}

/* toc */
.toc {
  background: var(--surface-low); border: 1px solid var(--outline-variant);
  border-radius: 14px; padding: 24px 28px; margin-bottom: 56px;
}
.toc h4 {
  font-size: 11px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--on-surface-variant); margin-bottom: 14px;
}
.toc ol { margin: 0 0 0 20px; }
.toc li { font-size: 15px; margin-bottom: 7px; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }

/* cta */
.cta {
  margin-top: 80px; padding: 40px; text-align: center;
  background: var(--surface-low); border: 1px solid var(--outline-variant);
  border-radius: 18px;
}
.cta h3 { font-size: 22px; font-weight: 800; margin-bottom: 10px; }
.cta p { color: var(--on-surface-variant); margin-bottom: 22px; }
.btn {
  display: inline-block; background: var(--primary); color: #fff;
  padding: 14px 32px; border-radius: 100px; font-weight: 700; font-size: 15px;
  text-decoration: none; transition: background .15s;
}
.btn:hover { background: var(--primary-container); }

/* footer */
footer {
  border-top: 1px solid var(--outline-variant);
  padding: 40px 32px; text-align: center;
}
footer p { font-size: 13px; color: var(--on-secondary-container); }
footer a { color: var(--on-surface-variant); }

.backlink {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; text-decoration: none;
  color: var(--on-surface-variant); margin-bottom: 32px;
}
.backlink:hover { color: var(--primary); }