:root {
  --ink: #202124; --muted: #5f6368; --faint: #9aa0a6;
  --paper: #ffffff; --soft: #f7f5f2; --line: #e3e0dc; --accent: #49645a;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #ecebe9; --muted: #b3b0ab; --faint: #7d7a76;
          --paper: #17181a; --soft: #202124; --line: #33353a; --accent: #8fb3a4; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink);
       font: 16px/1.75 "Avenir Next", -apple-system, "PingFang TC", "Noto Sans TC", sans-serif; }
header { border-bottom: 1px solid var(--line); background: var(--soft); }
header .inner, main, footer .inner { max-width: 760px; margin: 0 auto; padding: 0 22px; }
header .inner { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 18px;
                min-height: 60px; padding-top: 10px; padding-bottom: 10px; }
header .brand { font-weight: 700; letter-spacing: .02em; color: var(--ink); text-decoration: none; white-space: nowrap; }
header nav { margin-left: auto; display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 14px; }
header nav a { color: var(--muted); text-decoration: none; white-space: nowrap; }
@media (max-width: 420px) {
  header nav { margin-left: 0; width: 100%; }
  h1 { font-size: 24px; }
}
header nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
main { padding-top: 34px; padding-bottom: 60px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 6px; }
.meta { color: var(--faint); font-size: 13px; margin-bottom: 26px; }
h2 { font-size: 18px; margin: 36px 0 8px; padding-top: 4px; }
h3 { font-size: 16px; margin: 20px 0 4px; }
p, li { color: var(--ink); }
.lead { color: var(--muted); }
ul { padding-left: 1.3em; }
li { margin: 4px 0; }
a { color: var(--accent); }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 10px 0; }
th, td { text-align: left; vertical-align: top; padding: 9px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
.table-wrap { overflow-x: auto; }
.note { background: var(--soft); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; font-size: 14px; color: var(--muted); }
footer { border-top: 1px solid var(--line); color: var(--faint); font-size: 13px; }
footer .inner { padding-top: 18px; padding-bottom: 30px; }