:root{--bg:#EAF6FF;--white:#fff;--soft:#F3FAFF;--ice:#DFF2FF;--deep:#0F4F7A;--title:#1E5F8F;--blue:#2F91E8;--text:#1F2D3A;--muted:#526B82;--footer:#083B63;--border:rgba(47,145,232,.18);--shadow:0 14px 36px rgba(47,145,232,.14)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.75;overflow-x:hidden}body.menu-open{overflow:hidden}a{text-decoration:none;color:inherit}img{display:block;max-width:100%;height:auto}.container{width:min(1180px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:9999;background:linear-gradient(180deg,rgba(105,180,240,.96),rgba(126,199,255,.92));backdrop-filter:blur(10px);box-shadow:0 8px 24px rgba(47,145,232,.14)}.desktop-header{height:78px;display:flex;align-items:center;gap:24px}.brand-logo{display:flex;align-items:center;flex:0 0 auto}.brand-logo 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