:root {
  color-scheme: light;
  --bg: #fbfbf9; --panel: #ffffff; --text: #141416; --muted: #5f5f66; --line: #e5e5e0; --accent: #0a66d8; --soft: #f2f2ee;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { color-scheme: dark; --bg: #0e0f11; --panel: #18191d; --text: #ececee; --muted: #a0a0a8; --line: #2a2b30; --accent: #6aa8ff; --soft: #15161a; }
}
:root[data-theme="dark"] { color-scheme: dark; --bg: #0e0f11; --panel: #18191d; --text: #ececee; --muted: #a0a0a8; --line: #2a2b30; --accent: #6aa8ff; --soft: #15161a; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); }
.bar { display: flex; align-items: center; gap: 16px; max-width: 860px; margin: 0 auto; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.bar .logo { font-weight: 700; color: var(--text); text-decoration: none; display: flex; gap: 8px; align-items: center; }
.bar nav { margin-left: auto; display: flex; gap: 14px; font-size: 14px; }
.bar nav a { color: var(--muted); text-decoration: none; }
.bar nav a.on { color: var(--text); font-weight: 600; }
main { max-width: 860px; margin: 0 auto; padding: 28px 20px 80px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; letter-spacing: -.01em; }
h2 { font-size: 21px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 22px 0 6px; }
.meta { color: var(--muted); font-size: 14px; }
.lang-switch { display: inline-flex; gap: 8px; margin: 14px 0 6px; font-size: 14px; }
.lang-switch a { padding: 4px 10px; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; color: var(--text); }
.toc { background: var(--soft); border: 1px solid var(--line); border-radius: 12px; padding: 12px 18px; margin: 18px 0; font-size: 15px; }
.toc ol { margin: 6px 0; padding-left: 20px; }
.table-wrap { overflow-x: auto; margin: 10px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; line-height: 1.5; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--soft); }
.note { background: var(--soft); border-left: 3px solid var(--accent); padding: 10px 14px; border-radius: 0 8px 8px 0; margin: 14px 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }
code { font-size: 13px; background: var(--soft); padding: 1px 5px; border-radius: 5px; }