:root {
  --bg: #f5f7f6;
  --surface: #ffffff;
  --text: #17201c;
  --muted: #5b6862;
  --line: #dce3df;
  --accent: #1f7a55;
  --brand: #14392b;
  --note-bg: #fff6e0;
  --note-line: #e8c46a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1513;
    --surface: #17201d;
    --text: #e7eeea;
    --muted: #9fb0a8;
    --line: #2a3833;
    --accent: #5fd0a0;
    --brand: #b9e6d2;
    --note-bg: #2b2412;
    --note-line: #8a6d24;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Apple SD Gothic Neo", "PingFang SC", "Noto Sans", sans-serif;
}
a { color: var(--accent); }
header.top {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  justify-content: space-between;
  max-width: 820px;
  margin: 0 auto;
  padding: 18px 16px 8px;
}
.brand { font-weight: 700; font-size: 20px; color: var(--brand); text-decoration: none; }
header nav { display: flex; gap: 16px; flex-wrap: wrap; }
header nav a { text-decoration: none; color: var(--muted); }
header nav a[aria-current="page"] { color: var(--text); font-weight: 600; }
main { max-width: 820px; margin: 0 auto; padding: 8px 16px 40px; }
h1 { font-size: 30px; line-height: 1.25; margin: 20px 0 8px; color: var(--brand); }
h2 { font-size: 21px; margin: 34px 0 10px; padding-top: 6px; border-top: 1px solid var(--line); }
h3 { font-size: 17px; margin: 22px 0 6px; }
.lead { font-size: 19px; font-weight: 600; margin: 0 0 8px; }
.muted { color: var(--muted); font-size: 14px; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; overflow-wrap: anywhere; }
.note { background: var(--note-bg); border-left: 4px solid var(--note-line); padding: 10px 14px; border-radius: 6px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; margin: 18px 0; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.card h3 { margin: 0 0 4px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.table { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; background: var(--surface); }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--bg); }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; margin: 8px 0; padding: 10px 14px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details > div > p:first-child { margin-top: 8px; }
.langlist { list-style: none; padding: 0; }
.langlist li { margin: 10px 0; font-size: 17px; }
footer { max-width: 820px; margin: 0 auto; padding: 16px 16px 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
footer .langs a { margin-right: 12px; white-space: nowrap; }
footer .langs a[aria-current] { color: var(--text); font-weight: 600; text-decoration: none; }
@media (max-width: 480px) {
  h1 { font-size: 26px; }
  body { font-size: 15.5px; }
}