:root{--ink:#111a42;--blue:#164b9b;--azure:#1863dc;--mist:#f4f6fa;--line:#dce1eb;--muted:#65708b;--deep:#17183d;--violet:#24184f;--serif:Georgia,'Times New Roman',serif;--sans:Arial,'Helvetica Neue',sans-serif;--mono:'Courier New',monospace}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--mist);color:var(--ink);font:15px/1.5 var(--sans)}img{display:block;max-width:100%}a{color:inherit;text-decoration:none}button,input{font:inherit}.shell{width:min(100%,1560px);margin:0 auto;padding:0 56px}.header{position:sticky;z-index:20;top:0;background:rgba(255,255,255,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.nav-wrap{height:88px;display:flex;align-items:center;gap:38px}.brand{flex:none}.brand img{width:148px;height:auto}.nav{display:flex;align-items:center;gap:32px;flex:1}.nav a{color:var(--ink)}.nav a:hover,.nav .active{color:var(--azure)}.search{width:390px;height:46px;display:flex;align-items:center;border:1px solid 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