:root { color-scheme: light; }
html { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; color: #1f2937; background: #f8fafc; }
body { max-width: 860px; margin: 0 auto; padding: 32px 20px 72px; line-height: 1.8; background: #fff; }
h1 { color: #111827; font-size: 2rem; line-height: 1.3; }
h2 { margin-top: 2.25rem; padding-bottom: .35rem; border-bottom: 1px solid #e5e7eb; }
h3 { margin-top: 1.75rem; }
a { color: #2563eb; }
table { display: block; width: 100%; overflow-x: auto; border-collapse: collapse; }
th, td { padding: .55rem .7rem; border: 1px solid #d1d5db; text-align: left; vertical-align: top; }
blockquote { margin-left: 0; padding-left: 1rem; border-left: 4px solid #d1d5db; color: #4b5563; }
@media (max-width: 640px) { body { padding: 22px 16px 56px; } h1 { font-size: 1.65rem; } }