:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif; color: #17302a; background: #f1f7f4; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; }
main { width: min(42rem, calc(100% - 3rem)); padding: 2.5rem; border: 1px solid #d7e8de; border-radius: 1rem; background: white; box-shadow: 0 1rem 3rem #173b2912; }
.eyebrow { color: #28734f; font-size: .9rem; font-weight: 650; letter-spacing: .04em; }
h1 { margin: .6rem 0 1rem; font-size: clamp(1.7rem, 5vw, 2.4rem); }
p { line-height: 1.7; }
.intro { color: #52635b; }
nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; margin: 1.5rem 0; }
nav span { padding: 1rem; border: 1px solid #d7e8de; border-radius: .65rem; background: #f7fbf8; font-weight: 600; }
.notice { margin-top: 1.5rem; padding: 1rem; border-left: 4px solid #398e67; background: #eef9f2; }
@media (max-width: 420px) { main { padding: 1.5rem; } nav { grid-template-columns: 1fr; } }