:root {
  color-scheme: light dark;
  --bg: #0d1117;
  --panel: #151b23;
  --text: #f2f4f7;
  --muted: #aab4c3;
  --line: #2a3442;
  --accent: #69d2b0;
  --accent-strong: #a5f3d6;
  --max: 72rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #172231 0, var(--bg) 34rem);
  color: var(--text);
  line-height: 1.6;
}

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

a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.shell {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.25rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: linear-gradient(145deg, #1e2a37, #10171f);
  color: var(--accent-strong);
  letter-spacing: -0.04em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
}

nav a:hover {
  color: var(--text);
}

.hero {
  padding: 6rem 0 4.5rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3rem, 10vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.lede {
  max-width: 42rem;
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding: 0 0 4.5rem;
}

.card {
  min-height: 13rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: rgba(21, 27, 35, 0.86);
}

.card h2 {
  margin-top: 0;
  font-size: 1.2rem;
}

.card p {
  margin-bottom: 0;
  color: var(--muted);
}

.page {
  max-width: 48rem;
  padding: 5rem 0 6rem;
}

.page h1 {
  max-width: none;
  font-size: clamp(2.5rem, 8vw, 4.5rem);
}

.page h2 {
  margin-top: 2.5rem;
  font-size: 1.35rem;
}

.page p,
.page li {
  color: var(--muted);
}

.note {
  margin: 2rem 0;
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--accent);
  background: rgba(105, 210, 176, 0.08);
  color: var(--text);
}

footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 4rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}