:root {
  color-scheme: light dark;
  --background: #f5f6f8;
  --surface: #ffffff;
  --text: #20232b;
  --secondary: #606875;
  --line: #e4e8ee;
  --brand: #167b60;
  --notice: #fff5df;
  --notice-text: #745015;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --background: #121418; --surface: #1c1f25; --text: #e8eaf0;
    --secondary: #a8aebb; --line: #343943; --brand: #72d2b2;
    --notice: #332b1b; --notice-text: #ead4a7;
  }
}
:root[data-theme="dark"] {
  --background: #121418; --surface: #1c1f25; --text: #e8eaf0;
  --secondary: #a8aebb; --line: #343943; --brand: #72d2b2;
  --notice: #332b1b; --notice-text: #ead4a7;
}
* { box-sizing: border-box; }
html { background: var(--background); scroll-padding-top: 24px; }
body {
  margin: 0;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  overflow-wrap: anywhere;
  -webkit-text-size-adjust: 100%;
}
main {
  width: min(100%, 800px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 32px 22px max(40px, env(safe-area-inset-bottom));
  background: var(--surface);
}
header { padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.eyebrow { color: var(--brand); font-size: 13px; font-weight: 650; letter-spacing: 1px; }
h1 { font-size: 28px; line-height: 1.4; margin: 8px 0 12px; }
h2 { margin: 32px 0 10px; font-size: 20px; line-height: 1.6; }
h3 { margin: 20px 0 8px; font-size: 17px; }
p { margin: 12px 0; }
ul, ol { padding-left: 1.4em; }
li { margin: 7px 0; }
a { color: var(--brand); text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--brand); outline-offset: 4px; }
.meta, footer { font-size: 13px; color: var(--secondary); }
.notice { margin: 22px 0; padding: 14px 16px; background: var(--notice); color: var(--notice-text); border-radius: 12px; }
.notice p { margin: 0; }
nav { margin: 24px 0; padding: 14px 18px; background: var(--background); border-radius: 12px; }
nav ol { margin: 0; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 16px 0; }
th, td { text-align: left; vertical-align: top; padding: 10px; border: 1px solid var(--line); min-width: 84px; }
th { background: var(--background); }
footer { border-top: 1px solid var(--line); margin-top: 36px; padding-top: 18px; }
[hidden] { display: none !important; }
@media (min-width: 840px) { main { margin: 32px auto; border-radius: 18px; padding: 40px 48px; } }