:root{--bg:#f7f8fc;--surface:#fff;--ink:#182033;--muted:#667085;--line:#e4e7ef;--primary:#5148dd;--dark:#111526;--soft:#f3f2ff;--shadow:0 20px 60px rgba(31,42,79,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(circle at 8% 0%,rgba(81,72,221,.08),transparent 30rem),var(--bg);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit}.container{width:min(1120px,calc(100% - 40px));margin:auto}.skip{position:fixed;top:-70px;left:18px;z-index:100;padding:10px 14px;border-radius:9px;color:#fff;background:var(--dark)}.skip:focus{top:18px}header{position:sticky;top:0;z-index:30;border-bottom:1px solid 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