:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Yu Gothic", Meiryo, sans-serif; color: #18232d; background: #f6f8fc; }
* { box-sizing: border-box; }
body { margin: 0; background: #f6f8fc; }
main { width: min(860px, calc(100% - 32px)); margin: 40px auto; padding: 32px; background: #fff; border: 1px solid #dfe5ed; border-radius: 10px; box-shadow: 0 16px 42px rgba(24,35,45,.08); }
h1 { margin: 0 0 8px; font-size: clamp(1.5rem, 4vw, 2.1rem); }
h2 { margin: 32px 0 10px; font-size: 1.15rem; }
p, li { color: #52606d; line-height: 1.85; }
ul { padding-left: 1.4em; }
a { color: #263bb5; }
.meta { color: #63707c; font-size: .82rem; }
.nav { display: flex; flex-wrap: wrap; gap: 12px 18px; margin-top: 28px; padding-top: 18px; border-top: 1px solid #dfe5ed; }
@media (max-width: 560px) { main { width: calc(100% - 20px); margin: 20px auto; padding: 22px 18px; } }