:root {
  --bg: #fbfaf8;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #4b47c9;
  --rule: #e5e3df;
  --card: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f1a;
    --text: #ececf1;
    --muted: #9a9aa8;
    --accent: #a5a2ff;
    --rule: #2a2a3a;
    --card: #17172a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

nav {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
  font-size: 15px;
}

nav a:first-child { font-weight: 600; color: var(--text); margin-right: auto; }

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

h1 { font-size: 34px; line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 21px; margin: 40px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 28px 0 4px; }

.lede { font-size: 19px; color: var(--muted); margin: 0 0 8px; }
.meta { font-size: 14px; color: var(--muted); }

.summary {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 4px 20px;
  margin: 32px 0;
}

ul { padding-left: 22px; }
li { margin: 6px 0; }

footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  color: var(--muted);
}