:root{--brand:#1478ff;--ink:#15223b;--muted:#717b8e;--paper:#f6f8fc;--surface:#fff;--line:#e7ecf4;--soft:#eef5ff;--success:#12845b;--danger:#bf2d2d;--shadow:0 16px 42px #2548761a}*{box-sizing:border-box}html{background:var(--paper)}body{color:var(--ink);background:radial-gradient(circle at 92% 5%, #4adcb41f, transparent 26rem), radial-gradient(circle at 8% 12%, #1478ff1a, transparent 24rem), var(--paper);min-height:100vh;margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.site-header{z-index:20;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffdb;border-bottom:1px solid #dee8f6d1;justify-content:space-between;align-items:center;min-height:68px;padding:0 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