:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1a2230;
  --muted: #5a6577;
  --rule: #dde2ea;
  --accent: #1d5c8c;
  --accent-ink: #ffffff;
  --accent-soft: #e6eff7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151c;
    --surface: #181e27;
    --text: #e6eaf0;
    --muted: #9aa5b5;
    --rule: #2a3340;
    --accent: #6fb0e0;
    --accent-ink: #0d1520;
    --accent-soft: #1b2a3a;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
a:focus-visible, .button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

header.site {
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; padding-top: 14px; padding-bottom: 14px;
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--muted); font-weight: 400; }
nav a { margin-left: 18px; text-decoration: none; color: var(--muted); font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

main { padding: 48px 0 64px; }
h1 { font-size: clamp(28px, 6vw, 40px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
h2 { font-size: 21px; margin: 40px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p, li { color: var(--text); }
.lede { font-size: 19px; color: var(--muted); margin: 0 0 28px; }
.meta { color: var(--muted); font-size: 14px; margin-top: -6px; }

.button {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  padding: 11px 20px; border-radius: 8px; text-decoration: none; font-weight: 600;
}
.button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--rule); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-top: 20px; }
.card {
  background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 18px;
}
.card h3 { margin-top: 0; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.callout {
  background: var(--accent-soft); border-left: 3px solid var(--accent);
  padding: 14px 18px; border-radius: 6px; margin: 20px 0;
}
.callout p { margin: 0; }

table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 10px 8px; border-bottom: 1px solid var(--rule); }
th { color: var(--muted); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; }
.table-scroll { overflow-x: auto; }
code { font-size: 14px; background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; word-break: break-all; }

footer.site { border-top: 1px solid var(--rule); color: var(--muted); font-size: 14px; }
footer.site .wrap { padding-top: 20px; padding-bottom: 28px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }
footer.site a { color: var(--muted); }