:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #0b1624;
  --muted: #52606d;
  --line: #d9e0e8;
  --link: #1e3a5f;
  --accent: #ff7a1a;
  --card: #f4f6f9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1320;
    --text: #eef2f6;
    --muted: #9aa8b6;
    --line: #243246;
    --link: #8cc4ff;
    --card: #121d2d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
a { color: var(--link); }
header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px 16px;
  padding: 16px;
  border-bottom: 3px solid var(--accent);
}
.brand { color: var(--text); font-weight: 700; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 16px; }
nav a { text-decoration: none; }
nav a:hover { text-decoration: underline; }
main { max-width: 760px; padding: 28px 16px 64px; margin: 0 auto; }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 18px; margin: 28px 0 8px; }
.meta { color: var(--muted); margin-top: 0; }
.note { background: var(--card); border-left: 3px solid var(--accent); padding: 12px 14px; border-radius: 6px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 12px 0 8px; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; vertical-align: top; text-align: left; }
th { font-weight: 600; }
ul { padding-left: 1.2rem; }
footer { max-width: 760px; margin: 0 auto; padding: 0 16px 40px; color: var(--muted); font-size: 14px; }