:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #5f6368;
  --line: #e3e3e8;
  --accent: #0a7f8f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1114;
    --surface: #171a1f;
    --text: #f2f3f5;
    --muted: #a0a6ad;
    --line: #2a2e35;
    --accent: #3cc3d4;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }

header.site {
  border-bottom: 1px solid var(--line);
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}
.brand { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; color: var(--text); text-decoration: none; }
nav a { margin-left: 20px; color: var(--muted); text-decoration: none; font-size: 16px; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }

main { padding: 48px 0 72px; }

h1 { font-size: clamp(32px, 6vw, 44px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
h2 { font-size: 24px; line-height: 1.25; letter-spacing: -0.01em; margin: 44px 0 12px; }
h3 { font-size: 18px; margin: 24px 0 6px; }
p, ul, ol { margin: 0 0 16px; }
ul, ol { padding-left: 22px; }
li { margin-bottom: 6px; }

.lede { font-size: 20px; color: var(--muted); max-width: 34em; }
.meta { color: var(--muted); font-size: 15px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
  margin: 24px 0;
}
.card p:last-child { margin-bottom: 0; }

.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); margin: 28px 0; }
.grid .card { margin: 0; }
.grid h3 { margin-top: 0; }

.pill {
  display: inline-block;
  margin-top: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: 15px;
}

details { border-top: 1px solid var(--line); padding: 14px 0; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; }
summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
details p { margin: 10px 0 0; color: var(--text); }

footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: 15px; }
footer.site .wrap { padding-top: 24px; padding-bottom: 40px; display: flex; flex-wrap: wrap; gap: 8px 24px; }
footer.site a { color: var(--muted); }