:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #5f6368;
  --line: #e3e5e8;
  --brand: #1e88e5;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --line: #2c3036;
    --brand: #64b5f6;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 48px; }
header { border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 24px; }
.org { margin: 0; font-weight: 600; color: var(--muted); }
.org span { margin-left: 8px; font-weight: 400; font-size: 0.9em; }
.org a { color: inherit; text-decoration: none; }
h1 { margin: 4px 0 0; font-size: 1.6rem; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
a { color: var(--brand); }
.mail { font-size: 1.1rem; font-weight: 600; }
.note { color: var(--muted); font-size: 0.9rem; }
dl { margin: 0; }
dt { font-weight: 600; margin-top: 12px; }
dd { margin: 2px 0 0; color: var(--text); }
.faq dt { margin-top: 16px; }
ul { padding-left: 1.2em; }
li { margin: 4px 0; }
footer { border-top: 1px solid var(--line); margin-top: 40px; padding-top: 16px; color: var(--muted); font-size: 0.9rem; }
footer p { margin: 8px 0 0; }