:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #5f6570;
  --line: #e4e6ea;
  --card: #f6f7f9;
  --accent: #3b5bdb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e8eaee;
    --muted: #9aa1ad;
    --line: #262a31;
    --card: #171a20;
    --accent: #7c93ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  line-height: 1.65;
  word-break: keep-all;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }

header.top { border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { color: var(--fg); font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.brand small { color: var(--muted); font-weight: 500; font-size: 13px; margin-left: 8px; }
nav.top a { color: var(--muted); font-size: 14px; margin-left: 20px; }

.hero { padding: 72px 0 40px; }
.hero h1 { font-size: 36px; margin: 0; letter-spacing: -0.02em; }
.hero p { color: var(--muted); margin: 8px 0 0; }

section { padding: 24px 0 40px; }
section h2 { font-size: 15px; color: var(--muted); font-weight: 600; margin: 0 0 16px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  color: var(--fg);
}
a.card:hover { text-decoration: none; border-color: var(--accent); }
.card strong { display: block; font-size: 17px; }
.card span { display: block; color: var(--muted); font-size: 14px; margin-top: 6px; }
.card em { display: block; font-style: normal; color: var(--accent); font-size: 13px; margin-top: 12px; }

.contact { font-size: 15px; }

footer.bottom { border-top: 1px solid var(--line); margin-top: 40px; padding: 28px 0 48px; color: var(--muted); font-size: 13px; }
footer.bottom p { margin: 2px 0; }
footer.bottom nav { margin-top: 12px; }
footer.bottom nav a { color: var(--muted); margin-right: 16px; }

.doc { padding: 48px 0 24px; }
.doc h1 { font-size: 26px; margin: 0 0 4px; }
.doc .updated { color: var(--muted); font-size: 13px; margin: 0 0 32px; }
.doc h2 { font-size: 17px; margin: 32px 0 8px; }
.doc p, .doc li { font-size: 15px; }
.doc ul { padding-left: 20px; }

@media (max-width: 560px) {
  .hero { padding: 48px 0 24px; }
  .hero h1 { font-size: 28px; }
  nav.top a { margin-left: 14px; }
}