:root {
  color-scheme: light dark;
  --fg: #1c1c1e;
  --bg: #ffffff;
  --muted: #6e6e73;
  --accent: #0066cc;
  --card: #f5f5f7;
  --border: #e5e5ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f2f2f7;
    --bg: #000000;
    --muted: #98989f;
    --accent: #4da3ff;
    --card: #1c1c1e;
    --border: #38383a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 80px;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.75;
}

.container {
  max-width: 680px;
  margin: 0 auto;
}

header.page-header {
  padding: 32px 0 16px;
}

h1 {
  font-size: 1.6rem;
  margin: 0 0 4px;
}

.updated {
  color: var(--muted);
  font-size: 0.85rem;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2.2em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4em;
}

p, li {
  font-size: 0.98rem;
}

.notice {
  background: var(--card);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 1.5em 0;
}

.contact-button {
  display: inline-block;
  margin-top: 8px;
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
}

footer {
  margin-top: 3em;
  color: var(--muted);
  font-size: 0.85rem;
}

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