:root{--ink:#171817;--muted:#6f726e;--soft:#a1a49f;--line:#e5e7e3;--line-strong:#d7dad5;--surface:#fff;--surface-soft:#f7f8f6;--surface-warm:#fbfbf9;--success:#24623e;--success-bg:#eef7f1;--danger:#9d4036;--danger-bg:#fcf1ef;--unknown:#8a681c;--unknown-bg:#faf5e8;--rail:76px;--motion-fast:.14s;--motion:.24s;--motion-slow:.38s;--t-display:clamp(34px, 3.4vw, 44px);--t-metric:clamp(22px, 2vw, 28px);--t-title:20px;--t-body:15px;--t-meta:13px;--t-label:11px;--measure:42em;--header:56px;--brand:48px;--chat:372px;--history:var(--chat);--ease:cubic-bezier(.22, 1, .36, 1)}*{box-sizing:border-box}html,body{background:var(--surface);width:100%;min-height:100%;color:var(--ink);-webkit-font-smoothing:antialiased;margin:0;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,PingFang SC,Noto Sans SC,Microsoft YaHei,sans-serif}button,input{font:inherit}button{color:inherit}button:focus-visible,input:focus-visible{outline-offset:2px;outline:2px solid #252725}.visually-hidden{clip:rect(0, 0, 0, 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