:root{--brand:#1478F2;--deep:#075DC9;--ink:#172033;--text:#3E4859;--muted:#6F7A89;--pale:#EDF5FF;--sub:#F7FAFF;--gray:#F5F6F8;--line:rgba(20,120,242,.12);--grayline:rgba(30,50,70,.08);--shadow:0 14px 38px rgba(21,67,118,.08);--footer:#0B1F38;--max:1280px;--navh:74px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}a{text-decoration:none;color:inherit}button,input{font:inherit}button{cursor:pointer}.skip-link{position:fixed;top:-80px;left:12px;z-index:9999;background:#fff;padding:10px}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.97);border-bottom:1px solid var(--grayline)}.nav-shell{max-width:var(--max);height:var(--navh);margin:auto;padding:0 20px}.desktop-nav{height:100%;display:grid;grid-template-columns:minmax(230px,1fr) auto 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