:root{color:#18231f;font-synthesis:none;--ink:#18231f;--muted:#69736f;--paper:#fffefa;--line:#d9d8cf;--accent:#e6ff55;--green:#17483a;background:#f2f0e9;font-family:Microsoft YaHei UI,PingFang SC,system-ui,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:radial-gradient(circle at 85% 8%,#e6ff5538,#0000 22rem),#f2f0e9;min-width:320px;min-height:100vh;margin:0}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}main{width:min(1120px,100% - 40px);margin:0 auto}.site-header{border-bottom:1px solid #18231f26;justify-content:space-between;align-items:center;height:68px;display:flex}.brand{color:var(--ink);letter-spacing:.08em;align-items:center;gap:12px;font-size:20px;font-weight:800;text-decoration:none;display:flex}.brand-mark{width:29px;height:31px;display:block;position:relative}.brand-mark i{border:1.5px solid var(--ink);background:#f2f0e9;width:18px;height:23px;position:absolute}.brand-mark 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