:root {
  --accent: #2563EB;
  --text: #0F172A;
  --muted: #475569;
  --line: #E2E8F0;
  --bg: #FFFFFF;
  --surface: #F8FAFC;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

header.site {
  border-bottom: 1px solid var(--line);
  padding: 20px 24px;
  background: var(--bg);
}

header.site .inner {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.wordmark {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}
.wordmark:hover { text-decoration: none; }
.wordmark span { color: var(--accent); }

header.site nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.hero {
  padding: 16px 0 8px;
}

h1 {
  font-size: 32px;
  letter-spacing: -0.02em;
  margin: 8px 0 8px;
}

.lede {
  font-size: 18px;
  color: var(--muted);
  max-width: 560px;
}

h2 {
  font-size: 18px;
  letter-spacing: -0.01em;
  margin: 32px 0 8px;
}

p, li {
  font-size: 16px;
  color: var(--text);
}

.muted { color: var(--muted); }

.card-grid {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  background: var(--surface);
  color: var(--text);
}
.card:hover {
  border-color: var(--accent);
  text-decoration: none;
}
.card .t {
  font-weight: 700;
  font-size: 17px;
}
.card .d {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}

footer.site {
  border-top: 1px solid var(--line);
  margin-top: 48px;
  padding: 24px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #F1F5F9;
    --muted: #94A3B8;
    --line: #1E293B;
    --bg: #0B1220;
    --surface: #111827;
    --accent: #60A5FA;
  }
}