:root{--navy:#153f61;--blue:#176c9f;--ink:#193449;--muted:#567184;--line:#d9e5ed;--snow:#f3f7fa;--lime:#c6ee87;--teal:#008e91;--gold:#c58619;font:16px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#fff;color-scheme:light}*{box-sizing:border-box}body{margin:0}a{color:var(--blue);text-underline-offset:4px}button{font:inherit;cursor:pointer}a,button{outline-offset:5px}a:focus-visible,button:focus-visible{outline:3px solid #67a7d4}h1,h2,h3,p{margin:0}p+p{margin-top:18px}h1{font-size:clamp(2rem,4vw,3.4rem);line-height:1.15;font-weight:760;letter-spacing:-.035em;max-width:650px}h2{font-size:clamp(1.45rem,2.5vw,2rem);line-height:1.35;letter-spacing:-.025em}h3{font-size:1.2rem;line-height:1.5;margin:30px 0 12px;font-weight:700;color:var(--navy)}header{border-bottom:1px solid var(--line)}.masthead{max-width:1260px;margin:auto;padding:22px 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