:root { color-scheme: light; font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; color: #172537; background: #f3f5f7; }
body { margin: 0; }
main { box-sizing: border-box; max-width: 850px; margin: 40px auto; padding: 40px; background: #fff; border: 1px solid #dce2e8; border-radius: 12px; }
h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.2; letter-spacing: -.02em; }
h2 { margin-top: 2rem; font-size: 1.25rem; }
p { line-height: 1.85; }
a { color: #1459a6; text-underline-offset: 3px; overflow-wrap: anywhere; }
a:focus-visible { outline: 3px solid #d89522; outline-offset: 3px; }
.eyebrow { font-size: .8rem; font-weight: 650; letter-spacing: .1em; color: #506071; }
.lead { font-size: 1.15rem; color: #354a61; }
nav { display: flex; flex-wrap: wrap; gap: 12px 24px; border-top: 1px solid #dce2e8; padding-top: 22px; margin-top: 36px; }
footer { margin-top: 26px; font-size: .85rem; color: #506071; }
@media (max-width: 600px) { main { margin: 12px; padding: 24px; } }