:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --line: #dde3ea;
  --text: #121821;
  --text-2: #4a5666;
  --accent: #1565c0;
  --on-accent: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0e13;
    --surface: #161b24;
    --line: #263040;
    --text: #f2f5f8;
    --text-2: #a3aebd;
    --accent: #3d8bfd;
    --on-accent: #ffffff;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
header.brand { display: flex; align-items: center; gap: 10px; margin-bottom: 32px; font-weight: 700; letter-spacing: 0.02em; }
header.brand a { color: inherit; text-decoration: none; }
.mark { width: 32px; height: 32px; border-radius: 9px; background: var(--accent); color: var(--on-accent); display: grid; place-items: center; font-size: 15px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.2rem; margin: 36px 0 8px; }
p, li { color: var(--text-2); }
strong { color: var(--text); }
a { color: var(--accent); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 24px; margin: 24px 0; }
.code { font: 700 2rem/1.2 ui-monospace, "SF Mono", Consolas, monospace; letter-spacing: 0.08em; color: var(--text); margin: 8px 0 16px; word-break: break-all; }
.button { display: inline-block; background: var(--accent); color: var(--on-accent); padding: 12px 22px; border-radius: 999px; font-weight: 600; text-decoration: none; }
.muted { font-size: 0.9rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; vertical-align: top; padding: 8px 8px 8px 0; border-bottom: 1px solid var(--line); color: var(--text-2); }
th { color: var(--text); }
footer { margin-top: 48px; font-size: 0.9rem; color: var(--text-2); }