:root{--blue:#1677EE;--blue2:#3395FF;--deep:#0A315E;--deep2:#075FC6;--ink:#16243A;--text:#3C485A;--muted:#6B7787;--soft:#F7FAFF;--ice:#EDF5FF;--line:rgba(22,119,238,.12);--shadow:0 12px 34px rgba(30,72,120,.08);--brand-shadow:0 14px 40px rgba(22,119,238,.14);--radius:22px;--max:1320px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;font-size:16px;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button{font:inherit}.shell{width:min(calc(100% - 40px),var(--max));margin:auto}.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.desktop-nav{height:74px;display:flex;align-items:center;gap:26px}.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}.brand-island{padding:7px 12px 7px 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