:root{--ink:#0A1628;--text:#1E2A3A;--muted:#4A5568;--soft:#718096;--blue:#0033A0;--bright:#0052CC;--deep:#002066;--panel:#F5F7FA;--sub:#EEF1F6;--line:rgba(0,51,160,.14);--shadow:0 12px 36px rgba(0,33,102,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--text);font:16px/1.75 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(0,82,204,.32);outline-offset:2px}.shell{width:min(1220px,calc(100% - 32px));margin:0 auto}.site-header{position:fixed;z-index:80;top:0;left:0;right:0}.spine{height:18px;background:var(--deep);color:#fff;font-size:11px}.spine-inner{height:18px;display:flex;align-items:center;justify-content:space-between}.text-button{border:0;background:transparent;color:#fff;padding:0 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