:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1c1c1e;
  --text-secondary: #6e6e73;
  --accent: #007aff;
  --border: #e5e5ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f5f5f7;
    --text-secondary: #98989d;
    --accent: #0a84ff;
    --border: #2c2c2e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.7;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
}

h1 {
  font-size: 1.6rem;
  margin: 0 0 8px;
}

.lede {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 28px;
}

section {
  margin-bottom: 22px;
}

section h2 {
  font-size: 1.05rem;
  margin: 0 0 8px;
}

section p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin: 0;
  white-space: pre-line;
}

.date {
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-top: 32px;
}

.back {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
}

.links {
  display: flex;
  gap: 16px;
  margin-top: 20px;
  font-size: 0.9rem;
}

.links a {
  color: var(--accent);
  text-decoration: none;
}

.app-icon {
  font-size: 2.4rem;
  margin-bottom: 4px;
}

.contact {
  font-size: 0.95rem;
}

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