:root {
  --black: #000;
  --navy: #050a1a;
  --blue: #0047ff;
  --white: #f5f5f5;
  --muted: #a8b3cf;
  --line: rgba(245, 245, 245, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(0, 71, 255, 0.24), transparent 34rem),
    linear-gradient(135deg, var(--black), var(--navy));
  color: var(--white);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mark {
  color: var(--white);
  font-weight: 800;
}

.hero {
  padding: 78px 0 54px;
}

.eyebrow {
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: "Space Grotesk", Inter, ui-sans-serif, system-ui, sans-serif;
  line-height: 1.02;
}

h1 {
  max-width: 980px;
  margin: 14px 0 24px;
  font-size: clamp(3.1rem, 8vw, 7.3rem);
  letter-spacing: -0.07em;
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 4vw, 3.3rem);
  letter-spacing: -0.04em;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.lede {
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 14px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 42px 0;
}

.card,
.mini-card,
.repo-card,
.source-card,
.section {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(0, 0, 0, 0.38);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

.card,
.mini-card,
.repo-card,
.source-card {
  padding: 24px;
}

.mini-grid,
.repo-grid,
.source-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.repo-grid,
.source-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.mini-card p,
.repo-card p,
.source-card p,
.section p {
  color: var(--muted);
}

.section {
  margin: 24px 0;
  padding: clamp(24px, 5vw, 44px);
}

.number {
  color: var(--blue);
  font-weight: 900;
  font-size: 0.85rem;
  letter-spacing: 0.13em;
}

ul {
  padding-left: 1.2rem;
}

li {
  margin: 0.7rem 0;
}

.checklist {
  padding-left: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding-left: 2rem;
}

.checklist li::before {
  content: "OK";
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 900;
}

.prompt-block p {
  margin: 0;
  padding: 22px;
  border: 1px solid rgba(0, 71, 255, 0.38);
  border-radius: 20px;
  background: rgba(0, 71, 255, 0.11);
  color: var(--white);
  font-size: 1.08rem;
}

.glossary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 22px 0 0;
}

.glossary-item {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.04);
}

.glossary dt {
  margin-bottom: 8px;
  color: var(--white);
  font-weight: 900;
}

.glossary dd {
  margin: 0;
  color: var(--muted);
}

.repo-card a,
.source-card a {
  font-weight: 900;
}

.repo-meta {
  margin-top: 8px;
  color: var(--blue);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.cta {
  margin: 48px 0 72px;
  padding: clamp(28px, 5vw, 52px);
  border-radius: 32px;
  background: linear-gradient(135deg, rgba(0, 71, 255, 0.26), rgba(0, 0, 0, 0.62));
  border: 1px solid rgba(0, 71, 255, 0.38);
}

.cta p {
  max-width: 720px;
}

.sources a {
  display: block;
  margin: 10px 0;
  color: var(--muted);
  word-break: break-word;
}

.footer {
  padding: 36px 0 48px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 820px) {
  .grid,
  .mini-grid,
  .repo-grid,
  .source-grid,
  .glossary {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 44px;
  }
}