:root{--ink:#242424;--paper:#fffaf0;--white:#fff;--yellow:#f7c948;--red:#ee6253;--blue:#65a9d8;--green:#69ad78;--muted:#777;--line:#e7dfd2;--shadow:0 10px 30px rgba(50,42,30,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;letter-spacing:0}button,input,textarea,select{font:inherit}button{cursor:pointer;color:inherit}.topbar{height:72px;padding:0 max(24px,calc((100vw - 1180px)/2));display:flex;align-items:center;justify-content:space-between;background:rgba(255,250,240,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}.brand{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--ink);font-size:19px;font-weight:900}.brand 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