:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --line: #e5e5ea;
  --accent: #2f6ba8;
  --card: #f7f7f9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131316;
    --fg: #ececf0;
    --muted: #9a9aa2;
    --line: #2c2c31;
    --accent: #6aa6dd;
    --card: #1c1c20;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 20px 80px;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
        "Pretendard", "Noto Sans KR", system-ui, sans-serif;
  word-break: keep-all;
}
main { max-width: 680px; margin: 0 auto; }
header { padding: 56px 0 32px; border-bottom: 1px solid var(--line); margin-bottom: 32px; }
.mark { display: flex; align-items: center; gap: 12px; }
.mark img { width: 56px; height: 56px; border-radius: 13px; }
h1 { font-size: 1.55rem; margin: 0; letter-spacing: -0.02em; }
h2 { font-size: 1.1rem; margin: 40px 0 10px; letter-spacing: -0.01em; }
h2:first-of-type { margin-top: 0; }
p, li { color: var(--fg); }
.lede { color: var(--muted); margin: 8px 0 0; }
ul { padding-left: 20px; }
li { margin: 6px 0; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 20px 0;
}
.card p:first-child { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
a { color: var(--accent); }
footer {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 0.875rem;
}
nav { margin-top: 12px; display: flex; gap: 16px; flex-wrap: wrap; }
code { background: var(--card); padding: 1px 6px; border-radius: 5px; font-size: 0.9em; }