:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #111318;
  --muted: #6b7280;
  --brand: #4f5dff;
  --border: #e7e9ee;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 48px 20px 96px;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 720px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
}

header { max-width: 720px; margin: 0 auto 24px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--brand);
  text-decoration: none;
}

h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 36px 0 10px; }
p, li { color: #23262d; }
.muted { color: var(--muted); font-size: 15px; }
ul { padding-left: 22px; }
li { margin-bottom: 8px; }
a { color: var(--brand); }

nav { max-width: 720px; margin: 24px auto 0; font-size: 15px; }
nav a { margin-right: 18px; }

table { width: 100%; border-collapse: collapse; margin: 12px 0 4px; font-size: 15px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }

@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1115; --surface: #171a21; --text: #f3f4f7; --muted: #9aa1ad; --border: #262a33; }
  p, li { color: #dfe2e8; }
}