:root{--bg:#F3FBFF;--blue:#22AEEA;--deep:#147FB8;--text:#1F2D3A;--muted:#5C6F82;--line:rgba(34,174,234,.16);--shadow:0 14px 36px rgba(34,174,234,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75;overflow-x:hidden}body.locked{overflow:hidden}a{text-decoration:none;color:inherit}.container{width:min(1180px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:9999;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);box-shadow:0 8px 24px rgba(34,174,234,.10)}.desktop-head{height:76px;display:flex;align-items:center;gap:24px}.brand-logo img,.mobile-logo img{display:block;max-width:150px;max-height:46px;object-fit:contain}.nav-core{display:flex;gap:10px;margin-left:auto}.nav-core a{padding:10px 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