:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1b1f24;
  --sub: #5b6470;
  --line: #dfe3e8;
  --accent: #1565c0;
  --accent-text: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171b;
    --card: #1d2126;
    --text: #e8ebee;
    --sub: #9aa4b0;
    --line: #2e343b;
    --accent: #64a8f0;
    --accent-text: #0b1520;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 "Malgun Gothic", "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
}
main { width: 100%; max-width: 720px; margin: 0 auto; padding: 32px 16px; flex: 1; }
main.center { display: flex; flex-direction: column; justify-content: center; text-align: center; }
h1 { font-size: 30px; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 32px 0 12px; }
p { margin: 0 0 12px; }
.lead { color: var(--sub); margin-bottom: 24px; }
.sub { color: var(--sub); font-size: 14px; }
a { color: var(--accent); }
.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: bold;
  text-decoration: none;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 { margin-top: 0; }
.card .button { margin: 4px 0 12px; }
ol { margin: 0; padding-left: 22px; }
li { margin-bottom: 6px; }
footer { padding: 20px 16px; text-align: center; color: var(--sub); font-size: 13px; }