:root{--bg:#F6F8F8;--white:#fff;--soft:#EAF0F2;--navy:#122E3B;--panel:#1A4050;--teal:#168E96;--link:#226D9D;--title:#193946;--text:#374D58;--muted:#647981;--line:#D9E3E6}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16.5px;line-height:1.8}a{color:var(--link);text-underline-offset:3px}a:hover{color:var(--teal)}a:focus-visible,summary:focus-visible{outline:3px solid #ffce74;outline-offset:3px}h1,h2,h3{color:var(--title);line-height:1.35;letter-spacing:.01em}h1{font-size:clamp(34px,3.3vw,42px);margin:0 0 22px}h2{font-size:26px;margin:0 0 18px}h3{font-size:20px;margin:0 0 12px}p{margin:0 0 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