:root{--bg:#f5f7ff;--ink:#1f2740;--title:#131a35;--muted:#66708a;--purple:#5b6cff;--violet:#7a5cff;--cyan:#00d4ff;--gold:#ffc857;--navy:#11182f;--line:rgba(91,108,255,.18);--shadow:0 20px 46px rgba(25,43,91,.14);--radius:22px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden}body.drawer-open{overflow:hidden}img{max-width:100%;height:auto;display:block}a{color:inherit}.shell,.header-inner,.footer-grid,.footer-bottom{width:min(1200px,calc(100% - 40px));margin-inline:auto}.site-header{position:sticky;top:0;z-index:9999;width:100%;background:rgba(12,18,40,.94);backdrop-filter:blur(12px);box-shadow:0 8px 26px 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