:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; color: #172d34; background: #f5f8f8; line-height: 1.85; }
* { box-sizing: border-box; }
body { margin: 0; }
header, main, footer { width: min(100% - 40px, 780px); margin: 0 auto; }
header { padding: 32px 0 24px; border-bottom: 1px solid #d6e3e4; }
.brand { color: #125d65; font-size: 1.1rem; font-weight: 700; text-decoration: none; }
main { padding: 36px 0 48px; }
h1 { margin: 0 0 12px; font-size: clamp(1.65rem, 4vw, 2.15rem); line-height: 1.45; }
h2 { margin: 32px 0 8px; font-size: 1.2rem; line-height: 1.6; }
p { margin: 12px 0; }
a { color: #075f6b; text-underline-offset: 3px; overflow-wrap: anywhere; }
a:focus-visible { outline: 3px solid #196c75; outline-offset: 4px; }
li + li { margin-top: 8px; }
ul, ol { padding-left: 1.5rem; }
.note { margin: 24px 0; padding: 18px 22px; background: #e7f1f2; border-left: 4px solid #1c6d75; border-radius: 0 6px 6px 0; }
.note p { margin: 0; }
.meta, footer { color: #50646a; font-size: .9rem; }
footer { padding: 24px 0 40px; border-top: 1px solid #d6e3e4; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 24px; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }