:root {
  --navy: #1F4E79;
  --navy-dark: #163d5e;
  --ink: #202124;
  --muted: #5f6368;
  --line: #e0e0e0;
  --bg: #f6f8fa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

header.site {
  background: var(--navy);
  color: #fff;
  padding: 18px 0;
}
header.site .wrap { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
header.site h1 { margin: 0; font-size: 20px; font-weight: 600; }
header.site .tag { font-size: 13px; color: #cfe0f0; }
header.site nav { margin-left: auto; display: flex; gap: 16px; }
header.site nav a { color: #fff; text-decoration: none; font-size: 14px; opacity: 0.9; }
header.site nav a:hover { opacity: 1; text-decoration: underline; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

main { background: #fff; margin: 24px auto; max-width: 760px; padding: 8px 28px 32px;
       border: 1px solid var(--line); border-radius: 10px; }

h2 { color: var(--navy); font-size: 22px; margin-top: 28px; }
h3 { color: var(--navy); font-size: 16px; margin-top: 22px; }
a { color: #1a73e8; }
code { background: #f1f3f4; padding: 1px 5px; border-radius: 4px; font-size: 0.92em; }
.muted { color: var(--muted); font-size: 14px; }
.lede { font-size: 16px; color: var(--muted); }

table { border-collapse: collapse; width: 100%; margin: 14px 0; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); font-size: 14px; vertical-align: top; }
th { color: var(--navy); }

.callout { background: #e8f0fe; border-left: 4px solid var(--navy); padding: 12px 16px; border-radius: 6px; margin: 18px 0; font-size: 14px; }

ol li, ul li { margin: 6px 0; }

footer.site { text-align: center; color: var(--muted); font-size: 13px; padding: 24px 20px 40px; }
footer.site a { color: var(--muted); }