:root{--ink:#101828;--muted:#667085;--line:#d9e2ec;--surface:#ffffff;--soft:#f4f7fb;--blue:#1769e0;--teal:#0f9f8f;--amber:#c57b11;--green:#157347}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:#fff;font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}.container{width:min(1180px,calc(100% - 32px));margin:0 auto}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;border-bottom:1px solid var(--line);background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.nav{min-height:72px;justify-content:space-between;gap:18px}.brand,.nav{display:flex;align-items:center}.brand{gap:10px;font-weight:800}.brand 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