:root {
  color-scheme: dark;
  --background: #050812;
  --surface: #0d1424;
  --surface-raised: #121d32;
  --text: #f7f9ff;
  --muted: #aab5c8;
  --line: rgba(173, 196, 230, 0.18);
  --accent: #5ec2ff;
  --accent-strong: #99dcff;
  --max-width: 72rem;
}

* { box-sizing: border-box; }

html { background: var(--background); }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 78% 8%, rgba(45, 119, 191, 0.22), transparent 30rem),
    radial-gradient(circle at 16% 34%, rgba(64, 92, 166, 0.12), transparent 24rem),
    var(--background);
  color: var(--text);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: var(--accent-strong); }
a:hover { color: #ffffff; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 0.25rem; }

.site-header,
main,
footer {
  width: min(calc(100% - 2.5rem), var(--max-width));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 1px solid rgba(94, 194, 255, 0.45);
  border-radius: 50%;
  background: rgba(94, 194, 255, 0.12);
  color: var(--accent);
  font: 800 0.75rem/1 ui-monospace, SFMono-Regular, Menlo, monospace;
}

nav { display: flex; gap: 1.25rem; }
nav a { color: var(--muted); font-weight: 650; text-decoration: none; }

main { padding-block: clamp(3.5rem, 8vw, 7.5rem); }

.hero { max-width: 58rem; }
.eyebrow, .kicker {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font: 800 0.75rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.14em;
}

h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(3rem, 9vw, 6.8rem);
  line-height: 0.95;
  letter-spacing: -0.065em;
}

.lede {
  max-width: 44rem;
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
}

.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
}
.button.primary { border-color: var(--accent); background: var(--accent); color: #03101b; }
.button.secondary { background: rgba(255,255,255,0.035); color: var(--text); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: clamp(4rem, 10vw, 8rem);
}

.feature-grid article {
  min-height: 16rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: linear-gradient(145deg, rgba(18, 29, 50, 0.92), rgba(9, 14, 25, 0.86));
}

h2 { margin: 0; font-size: 1.45rem; line-height: 1.2; }
.feature-grid p:last-child { color: var(--muted); }
.independence-note { max-width: 58rem; margin: 3rem 0 0; color: var(--muted); font-size: 0.9rem; }

.document { max-width: 52rem; }
.document h1 { max-width: 15ch; font-size: clamp(2.8rem, 7vw, 5rem); }
.document h2 { margin-top: 3rem; }
.document h3 { margin-top: 2rem; }
.document p, .document li { color: var(--muted); }
.document strong { color: var(--text); }
.document .updated { margin-top: 1.25rem; color: var(--accent-strong); }
.document .callout {
  margin: 2rem 0;
  padding: 1.25rem;
  border: 1px solid rgba(94, 194, 255, 0.3);
  border-radius: 1rem;
  background: rgba(94, 194, 255, 0.08);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 48rem) {
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 0; }
}

@media (max-width: 34rem) {
  .site-header { align-items: flex-start; flex-direction: column; }
  main { padding-block: 3rem; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: no-preference) {
  .button { transition: color 160ms ease, background-color 160ms ease, transform 160ms ease; }
  .button:hover { transform: translateY(-1px); }
}