:root {
  --bg: #F3F7F9; --card: #FFFFFF; --ink: #0E2233; --muted: #5B6B78; --line: #DDE6EB;
  --brand: #0A4DB0; --accent: #C8F25A; --note-bg: #EEF4FF;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0F1720; --card: #17222D; --ink: #E7EEF3; --muted: #9AA8B3; --line: #26323D;
    --brand: #7FB0FF; --accent: #C8F25A; --note-bg: #1B2A3D;
  }
}
:root[data-theme="dark"] {
  --bg: #0F1720; --card: #17222D; --ink: #E7EEF3; --muted: #9AA8B3; --line: #26323D;
  --brand: #7FB0FF; --accent: #C8F25A; --note-bg: #1B2A3D;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 16px; line-height: 1.7; word-break: keep-all; overflow-wrap: anywhere;
}
header.top { border-bottom: 1px solid var(--line); background: var(--card); }
header.top .in { max-width: 760px; margin: 0 auto; padding: 14px 16px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 12px; }
header.top a.brand { color: var(--ink); text-decoration: none; font-weight: 800; letter-spacing: -0.01em; white-space: nowrap; }
header.top a.brand span { color: var(--muted); font-weight: 500; margin-left: 6px; font-size: 14px; }
nav.links { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
nav.links a { color: var(--muted); text-decoration: none; }
nav.links a[aria-current="page"] { color: var(--brand); font-weight: 700; }
main { max-width: 760px; margin: 0 auto; padding: 28px 16px 64px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 6px; letter-spacing: -0.02em; }
.sub { color: var(--muted); margin: 0 0 24px; font-size: 14px; }
h2 { font-size: 19px; margin: 36px 0 10px; padding-top: 8px; border-top: 1px solid var(--line); letter-spacing: -0.01em; }
h2:first-of-type { border-top: 0; }
h3 { font-size: 16px; margin: 20px 0 6px; }
p, li { margin: 6px 0; }
ul, ol { padding-left: 22px; }
a { color: var(--brand); }
.note { background: var(--note-bg); border-radius: 14px; padding: 14px 16px; margin: 16px 0; }
.table-wrap { overflow-x: auto; margin: 10px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
table { border-collapse: collapse; width: 100%; min-width: 520px; font-size: 14.5px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { background: var(--bg); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
.toc { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px 16px; font-size: 14.5px; }
.toc ol { margin: 4px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; margin: 14px 0; }
.card h3 { margin-top: 0; }
footer { max-width: 760px; margin: 0 auto; padding: 0 16px 40px; color: var(--muted); font-size: 13px; }