:root {
  --ink: #0f1419;
  --muted: #536471;
  --border: #eff3f4;
  --bg: #ffffff;
  --blue: #1d9bf0;
  --soft: #f7f9f9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7e9ea;
    --muted: #8b98a5;
    --border: #202327;
    --bg: #000000;
    --soft: #16181c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.bar {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
  margin-right: auto;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}
nav a:hover { color: var(--ink); text-decoration: underline; }
nav a[aria-current="page"] { color: var(--ink); font-weight: 700; }
nav { display: flex; gap: 18px; flex-wrap: wrap; }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

h1 {
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 6px;
}

.updated {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 28px;
}

h2 {
  font-size: 20px;
  margin: 36px 0 8px;
  letter-spacing: -0.01em;
}

p, li { color: var(--ink); }
ul { padding-left: 22px; }


footer {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding-top: 24px;
  color: var(--muted);
  font-size: 14px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
footer a { color: var(--muted); }

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

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 28px;
}
.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  text-decoration: none;
  color: inherit;
  display: block;
}
.card:hover { border-color: var(--blue); }
.card h3, .card h4 { margin: 0 0 4px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

h3 { font-size: 17px; margin: 22px 0 4px; }

.eyebrow {
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 8px;
}
.lede { font-size: 18px; color: var(--muted); margin: 12px 0 16px; }
.mission { font-size: 22px; font-weight: 700; line-height: 1.4; }
.caps { text-transform: uppercase; }

.toc {
  background: var(--soft);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 14px;
}
.toc ol { margin: 0; padding-left: 22px; }
.toc a { color: var(--ink); text-decoration: none; }
.toc a:hover { color: var(--blue); text-decoration: underline; }
h2[id] { scroll-margin-top: 80px; }

.contact {
  background: var(--soft);
  border-radius: 14px;
  padding: 4px 20px 12px;
  margin-top: 40px;
  overflow-wrap: anywhere;
}

.button {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-radius: 999px;
  padding: 10px 18px;
}
.button:hover { filter: brightness(1.08); }