:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #5b6270;
  --rule: #e4e6ea;
  --accent: #1f4ed8;
  --maxw: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --fg: #e8eaee;
    --muted: #9aa2b1;
    --rule: #262a31;
    --accent: #8fb0ff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
  max-width: var(--maxw);
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

a, a:visited { color: var(--accent); }
a:hover { text-decoration: none; }

header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 2.5rem 0 1.25rem;
  border-bottom: 1px solid var(--rule);
}

.mark {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mark span {
  margin-left: 0.4rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

nav a {
  margin-left: 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}
nav a:first-child { margin-left: 0; }
nav a:hover { color: var(--accent); }

section { padding: 2.75rem 0 0; }

h1 {
  margin: 0 0 1rem;
  font-size: 1.9rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero p { font-size: 1.05rem; }

p { margin: 0 0 1rem; }

dl { margin: 0; }

dt {
  margin-top: 1.5rem;
  font-weight: 600;
}
dt:first-child { margin-top: 0; }

dd {
  margin: 0.2rem 0 0;
  color: var(--muted);
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

ul li {
  margin-bottom: 0.85rem;
  color: var(--muted);
}

ul li strong { color: var(--fg); }

.button {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  color: var(--fg);
  font-size: 0.95rem;
  text-decoration: none;
}

.button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.85rem;
}

footer p { margin: 0; }