:root {
  --bg: #fafaf9;
  --fg: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --accent: #0d9488;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141414;
    --fg: #f5f5f4;
    --muted: #a8a29e;
    --line: #2e2e2e;
    --accent: #2dd4bf;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
}

.logo img { width: 28px; height: 28px; }

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 15px;
}

nav a:hover { color: var(--fg); }

:lang(ko) { word-break: keep-all; }

@media (max-width: 520px) {
  header .wrap { flex-wrap: wrap; gap: 10px; }
  nav a { margin: 0 14px 0 0; white-space: nowrap; }
}

main { padding: 56px 0 72px; }

h1 {
  font-size: 34px;
  line-height: 1.2;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 20px;
  margin: 40px 0 10px;
}

p, li { color: var(--fg); }
.lead { font-size: 18px; color: var(--muted); }
.muted { color: var(--muted); font-size: 14px; }

a { color: var(--accent); }

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  margin-top: 14px;
}

.card h3 { margin: 0 0 4px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); }

footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 14px;
}

footer a { color: var(--muted); }