:root{--paper:#f3f1eb;--card:#fbfaf6;--ink:#17191d;--muted:#696b70;--line:#dcdad2;--blue:#4a52ff;--blue-dark:#343be2;--lime:#d9ff67;--white:#fff;--shadow:0 28px 80px #1f1f2a1a}*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--paper)}body{color:var(--ink);background:radial-gradient(circle at 84% 8%, #4a52ff1c, transparent 22rem), radial-gradient(circle at 4% 58%, #d9ff6726, transparent 26rem), var(--paper);min-height:100vh;margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,SF Pro Display,PingFang SC,Microsoft YaHei,sans-serif}button,input,audio{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit}button:focus-visible,a:focus-visible,[role=button]:focus-visible,audio:focus-visible{outline-offset:3px;outline:3px solid #4a52ff4d}.page-shell{width:min(100%,1440px);margin:0 auto;padding:0 42px;overflow:hidden}.site-header{justify-content:space-between;align-items:center;max-width:1180px;height:96px;margin:0 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