:root { --bg: #ffffff; --fg: #1d2733; --muted: #5b6b7c; --accent: #0f7b8a; --line: #d5dde5; --code-bg: #eef3f7; --note-bg: #fff6df; --note-line: #e2b93b; --warn-bg: #fdecea; --warn-line: #d9534f; --ex-bg: #eaf6ee; --ex-line: #3c9a5f; --card-bg: #f7fafc; }
  @media (prefers-color-scheme: dark) {
    :root { --bg: #121a22; --fg: #dbe4ec; --muted: #93a4b5; --accent: #35b6c6; --line: #2b3a48; --code-bg: #1b2733; --note-bg: #2b2513; --note-line: #a9852a; --warn-bg: #3a1f1f; --warn-line: #c9534f; --ex-bg: #16301f; --ex-line: #3c9a5f; --card-bg: #16212b; }
  }
  * { box-sizing: border-box; }
  body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.55 "Segoe UI", Arial, sans-serif; display: flex; }
  nav { position: sticky; top: 0; align-self: flex-start; width: 270px; height: 100vh; overflow-y: auto; padding: 18px 14px; border-right: 1px solid var(--line); flex-shrink: 0; }
  nav h2 { margin: 0 0 10px; font-size: 16px; color: var(--accent); }
  nav a { display: block; padding: 3px 0; color: var(--fg); text-decoration: none; font-size: 14px; }
  nav a:hover { color: var(--accent); }
  nav a.sub { padding-left: 14px; color: var(--muted); font-size: 13px; }
  main { max-width: 920px; padding: 24px 40px 80px; }
  h1 { margin-top: 0; font-size: 28px; }
  h2 { margin-top: 42px; padding-top: 10px; border-top: 1px solid var(--line); font-size: 22px; color: var(--accent); }
  h3 { margin-top: 26px; font-size: 17px; }
  h4 { margin: 12px 0 4px; font-size: 14.5px; color: var(--accent); }
  code, pre, kbd { font-family: Consolas, "Courier New", monospace; background: var(--code-bg); border-radius: 4px; }
  code, kbd { padding: 1px 5px; font-size: 13.5px; }
  pre { padding: 10px 14px; overflow-x: auto; font-size: 13px; }
  table { border-collapse: collapse; margin: 10px 0 16px; width: 100%; }
  th, td { border: 1px solid var(--line); padding: 5px 9px; text-align: left; vertical-align: top; font-size: 14px; }
  th { background: var(--code-bg); }
  .note { background: var(--note-bg); border-left: 4px solid var(--note-line); padding: 8px 14px; margin: 14px 0; }
  .item { background: var(--card-bg); border: 1px solid var(--line); border-radius: 8px; padding: 4px 18px 12px; margin: 18px 0; }
  .item h3 { margin-top: 12px; }
  .warn { background: var(--warn-bg); border-left: 4px solid var(--warn-line); padding: 8px 14px; margin: 10px 0; }
  .example { background: var(--ex-bg); border-left: 4px solid var(--ex-line); padding: 8px 14px; margin: 10px 0; }
  .lang { float: right; font-size: 13px; }
  .lang a { color: var(--accent); }
  ul, ol { padding-left: 22px; }
  li { margin: 3px 0; }
  @media (max-width: 800px) { nav { display: none; } main { padding: 16px; } }

.site-back { margin: 0 0 12px; font-size: 14px; }
.site-back a { color: var(--accent); }
@media (max-width: 760px) {
  body { display: block; }
  nav { position: static; width: auto; height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  main { padding: 16px 16px 60px; }
  table { display: block; overflow-x: auto; }
}