:root{--bg:#F4F7FA;--surface:#fff;--soft:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--deep:#163C57;--cyan:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text)}a{color:#1165a7;text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%}.shell{width:min(100% - 56px,1200px);margin-inline:auto}h1,h2,h3{color:var(--title);line-height:1.38;margin:0 0 18px}h1{font-size:clamp(32px,3vw,42px);letter-spacing:-.035em}h2{font-size:26px}h3{font-size:20px}p{margin:0 0 19px}ul,ol{padding-left:1.5em}li{margin:8px 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