:root{--bg:#f5fbff;--white:#fff;--soft:#eaf7fc;--tint:#dff5fb;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--deep:#174b78;--heading:#173b60;--text:#2d4359;--muted:#687f93;--line:#dcebf3;--shadow:0 14px 38px rgba(23,75,120,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}body.drawer-open{overflow:hidden}a{color:var(--blue);text-underline-offset:3px}a:hover{color:var(--deep)}img{max-width:100%}.container{width:min(100% - 48px,1160px);margin-inline:auto}h1,h2,h3,h4{color:var(--heading);line-height:1.35;margin:0 0 .7em}h1{font-size:clamp(30px,3.5vw,40px);letter-spacing:-.035em}h2{font-size:clamp(22px,2.3vw,26px)}h3{font-size:19px}p{margin:0 0 1.15em}main{min-height:58vh}main section{margin-block:44px}strong{color:var(--heading)}.skip-link{position:absolute;left:12px;top:-80px;z-index:100;padding:8px 15px;background:white}.skip-link:focus{top:8px}.site-header{position:sticky;z-index:30;top:0;background:white;border-bottom:1px solid var(--line);box-shadow:0 6px 28px 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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}