:root{--bg:#fff;--soft:#f5f7fa;--soft2:#eef1f6;--ink:#0a1628;--text:#1e2a3a;--muted:#4a5568;--blue:#0033a0;--blue2:#0052cc;--blue3:#002066;--line:rgba(0,51,160,.14);--line2:rgba(0,51,160,.32);--shadow:0 12px 36px rgba(0,33,102,.08);--glow:0 10px 28px rgba(0,51,160,.16);--max:1280px;--nav:72px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.72;overflow-x:hidden}body.panel-open{overflow:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav-shell{height:var(--nav);max-width:var(--max);margin:auto;padding:0 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