body {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 20px;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  color: #222;
}
header { display: flex; align-items: center; gap: 12px; padding: 24px 0; border-bottom: 1px solid #ddd; }
header p { margin: 0; font-weight: 700; line-height: 1.4; }
header small { font-size: 11px; font-weight: 400; color: #666; }
main img { display: block; width: 100%; height: auto; margin: 28px 0; }
h1 { margin: 0; font-size: 20px; }
.date { margin-top: 0; font-size: 13px; color: #666; }
footer { margin: 48px 0 32px; padding-top: 16px; border-top: 1px solid #ddd; font-size: 12px; color: #666; }

@media (max-width: 600px) {
  body { font-size: 14px; }
  header p { font-size: 15px; }
  h1 { font-size: 17px; }
}