:root{--bg:#ffffff;--ink:#141413;--muted:#8a8880;--line:#e5e2db;--paper:#f4f2ec;--accent:#c2522f;--max:1240px;--rail:250px;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Helvetica,Arial,sans-serif;--mono:"JetBrains Mono","Cascadia Code",Consolas,"SF Mono",Menlo,monospace}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{display:block}.top{position:-webkit-sticky;position:sticky;top:0;z-index:40;align-items:center;justify-content:space-between;padding:16px 40px;background:rgba(255,255,255,.88);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.brand,.top{display:flex}.brand{align-items:baseline;gap:10px;font-size:16.5px;font-weight:500;letter-spacing:.02em}.brand 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