:root{--bg:#F6FAFC;--surface:#fff;--pale:#EAF6FA;--pale2:#EDF4F8;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--heading:#183A56;--text:#31485D;--muted:#687D8E;--border:#DCE9F0;--footer:#123653;--radius:16px;--shell:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;color:var(--text);background:var(--bg);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}body.drawer-open{overflow:hidden}a{color:var(--navy);text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:var(--blue)}:focus-visible{outline:3px solid #25B6E8;outline-offset:3px}h1,h2,h3{color:var(--heading);line-height:1.4;letter-spacing:-.02em}h1{font-size:clamp(32px,3.3vw,42px);margin:12px 0 24px}h2{font-size:26px;margin:0 0 20px}h3{font-size:20px;margin:0 0 11px}p{margin:0 0 18px}strong{color:var(--heading)}.shell{width:min(var(--shell),calc(100% - 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