:root {
  --bg: #fff; --fg: #1c1c1e; --muted: #6b6b70; --accent: #c24e00;
  --border: #e3e3e8; --code: #f3f3f6; --note: #fff6ee;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214; --fg: #ececf0; --muted: #9a9aa3; --accent: #f0a066;
    --border: #2b2b31; --code: #1d1d22; --note: #241a12;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", sans-serif;
}
a { color: var(--accent); }
header.top {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
header.top .brand { font-weight: 700; color: var(--fg); text-decoration: none; display: flex; align-items: center; gap: 8px; }
header.top img { width: 24px; height: 24px; }
header.top nav a { margin-left: 12px; font-size: 14px; }
.layout { display: flex; max-width: 1000px; margin: 0 auto; padding: 0 16px; gap: 40px; }
aside.toc { width: 200px; flex: none; position: sticky; top: 64px; align-self: flex-start; padding: 24px 0; font-size: 14px; }
aside.toc a { display: block; color: var(--muted); text-decoration: none; padding: 3px 0; }
aside.toc a:hover { color: var(--accent); }
main { min-width: 0; flex: 1; padding-bottom: 64px; }
h1 { font-size: 2rem; margin: 32px 0 8px; }
h2 { font-size: 1.4rem; margin: 48px 0 8px; padding-top: 8px; border-top: 1px solid var(--border); }
h3 { font-size: 1.1rem; margin: 28px 0 4px; }
.lead { color: var(--muted); font-size: 1.1rem; }
code { background: var(--code); padding: 1px 5px; border-radius: 4px; font-size: .9em; }
table { border-collapse: collapse; width: 100%; margin: 12px 0; }
th, td { text-align: left; padding: 6px 10px; border: 1px solid var(--border); }
th { background: var(--code); }
.note { background: var(--note); border-left: 3px solid var(--accent); padding: 8px 14px; border-radius: 4px; margin: 14px 0; }
footer { border-top: 1px solid var(--border); padding: 20px 16px; text-align: center; color: var(--muted); font-size: 14px; }
figure { margin: 16px 0; }
figure img { width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--border); }
figure.phone img { width: auto; max-width: min(100%, 280px); display: block; margin: 0 auto; }
figcaption { color: var(--muted); font-size: 13px; text-align: center; margin-top: 6px; }
@media (max-width: 760px) {
  aside.toc { display: none; }
  header.top nav a:not(.lang) { display: none; }
  table { display: block; overflow-x: auto; }
}