:root{--ink:#172033;--muted:#687386;--purple:#7054e7;--border:#e0e4ed;--paper:#f6f7fb;--white:#fff;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;font-size:16px;line-height:1.7}a{color:inherit;text-decoration:none}button,select{font:inherit}a,button,select,summary{-webkit-tap-highlight-color:transparent}p,h1,h2,h3{margin:0}p{color:var(--muted)}h1,h2,h3{line-height:1.18;letter-spacing:-.04em}h1{font-weight:650;font-size:clamp(44px,5.4vw,72px)}h2{font-size:36px;font-weight:600}h3{font-size:23px;font-weight:600}img{max-width:100%}.site-header{position:sticky;top:0;z-index:10;background:#f6f7fbf2;backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}.header-inner{max-width:1240px;margin:auto;padding:20px 32px;display:flex;align-items:center;gap:32px}.brand{display:flex;align-items:center;gap:11px;margin-right:auto;flex:none}.brand img{border-radius:11px}.brand>span{font-size:21px;font-weight:700;line-height:1.25;letter-spacing:-.6px}.brand small{display:block;font-size:8px;font-weight:500;letter-spacing:1.6px;margin-top:5px;color:var(--muted)}.main-nav{display:flex;gap:28px;font-size:14px;font-weight:500;white-space:nowrap}.main-nav a{padding:5px 0;position:relative;color:var(--muted)}.main-nav a[aria-current],.main-nav a:hover{color:var(--ink)}.main-nav a[aria-current]:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--purple)}.language-control{display:flex;align-items:center;border-left:1px solid 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.demo-bottom{padding-left:70px}