:root{--blue:#1CA8F6;--bright:#38C7FF;--deep:#0877C9;--cyan:#7FE4FF;--ink:#223044;--muted:#5F7082;--bg:#F4FBFF;--footer:#082A46;--line:rgba(28,168,246,.14)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);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}.wrap{width:min(1180px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);box-shadow:0 8px 24px rgba(8,119,201,.08)}.top-nav{height:72px;display:flex;align-items:center;gap:28px}.brand img{width:148px;max-height:48px;object-fit:contain}.nav-core{display:flex;gap:26px;align-items:center;margin-left:auto}.nav-core a{color:#1D2A3A;font-weight:600;position:relative;padding:8px 2px}.nav-core a:hover,.nav-core 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