:root {
  --paper: #ffffff;
  --ink: #16181d;
  --muted: #5b6270;
  --line: #e6e8ec;
  --accent: #1d4ed8;
  --card: #f7f8fa;
}
[data-theme="dark"] {
  --paper: #101216;
  --ink: #eceef2;
  --muted: #9aa3b2;
  --line: #262a33;
  --accent: #7ea2ff;
  --card: #171a21;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  transition: background .2s ease, color .2s ease;
}
main, .top, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }

.top {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 28px; padding-bottom: 28px;
}
.wordmark {
  font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none;
}
.wordmark span { color: var(--accent); font-family: ui-monospace, monospace; font-weight: 500; }
nav { display: flex; gap: 16px; align-items: center; }
nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
nav a:hover, .card:hover h2 { color: var(--accent); }
#theme-toggle {
  background: none; border: 1px solid var(--line); border-radius: 999px;
  color: var(--ink); cursor: pointer; font-size: 1rem; padding: 2px 10px;
}

main { padding-top: 8vh; padding-bottom: 10vh; }
.eyebrow {
  font-family: ui-monospace, monospace; font-size: .78rem;
  text-transform: uppercase; letter-spacing: .12em; color: var(--accent);
}
h1 { font-size: clamp(2rem, 6vw, 3.2rem); letter-spacing: -0.03em; margin: .3em 0 .4em; }
.lede { color: var(--muted); font-size: 1.05rem; max-width: 54ch; }
code {
  font-family: ui-monospace, monospace; font-size: .9em;
  background: var(--card); border: 1px solid var(--line);
  border-radius: 4px; padding: 1px 5px;
}

.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 40px; }
@media (max-width: 560px) { .cards { grid-template-columns: 1fr; } }
.card {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 18px; text-decoration: none; color: var(--ink);
}
.card h2 { margin: 0 0 6px; font-size: 1rem; font-family: ui-monospace, monospace; }
.card p { margin: 0; color: var(--muted); font-size: .92rem; }

footer { border-top: 1px solid var(--line); padding-top: 18px; padding-bottom: 32px; }
footer p { color: var(--muted); font-size: .85rem; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }