:root {
  --bg: #fbf8f3;
  --surface: #ffffff;
  --text: #1f2a33;
  --muted: #5b6770;
  --line: #e4ddd2;
  --accent: #2f6f8f;
  --accent-soft: #e3eef3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11181d;
    --surface: #182228;
    --text: #e8edf0;
    --muted: #9aa8b1;
    --line: #2a363d;
    --accent: #7fb8d4;
    --accent-soft: #1f3440;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Segoe UI", Roboto, sans-serif;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header.site { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
header.site a.brand { color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.lang button { border: 0; background: transparent; color: var(--muted); padding: 6px 14px; font: inherit; font-size: 14px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: #2f6f8f; color: #fff; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 40px 0 8px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 17px; margin: 24px 0 4px; }
p, li { color: var(--text); }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
a { color: var(--accent); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin: 16px 0; }
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }
.card.accent { background: var(--accent-soft); border-color: transparent; }
.table-wrap { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
td:first-child, th:first-child { white-space: nowrap; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--surface); }
ol, ul { padding-left: 22px; }
code { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; font-size: 14px; }
footer { margin-top: 48px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); }
/* 언어 전환: JS가 켜지면 한 언어만 보인다. JS가 없으면 둘 다 보인다. */
html.js [data-lang] { display: none; }
html.js[data-show="ko"] [data-lang="ko"],
html.js[data-show="en"] [data-lang="en"] { display: block; }