:root{--blue:#22AEEA;--deep:#147FB8;--ink:#1F2D3A;--muted:#5C6F82;--soft:#8BA1B5;--bg:#F3FBFF;--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(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.75;overflow-x:hidden}body.locked{overflow:hidden}a{text-decoration:none;color:inherit}img{display:block;max-width:100%}.wrap{width:min(1180px,calc(100% - 36px));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,.1)}.desktop-head{height:76px;display:grid;grid-template-columns:210px 1fr auto;align-items:center;gap:24px}.brand-logo img{width:166px;height:48px;object-fit:contain}.nav-core{display:flex;justify-content:center;gap:10px;white-space:nowrap}.nav-core a{padding:9px 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