:root{--bg:#F3FBFF;--blue:#22AEEA;--deep:#147FB8;--text:#1F2D3A;--muted:#5C6F82;--soft:#8BA1B5;--line:rgba(34,174,234,.16);--shadow:0 14px 36px rgba(34,174,234,.12);--footer:#0B3D5C}*{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",Arial,sans-serif;line-height:1.75;overflow-x:hidden}a{text-decoration:none;color:inherit}img{display:block;max-width:100%;height: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)}.header-inner{max-width:1220px;height:76px;margin:auto;padding:0 22px;display:flex;align-items:center;gap:22px}.brand-logo{display:flex;align-items:center;flex:0 0 auto}.brand-logo img{width:158px;max-height:48px;object-fit:contain}.nav-core{display:flex;justify-content:center;gap:10px;flex:1}.nav-core a{padding:9px 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