:root{font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;color:var(--ink);background:var(--bg);--bg:#faf9f7;--surface:#fff;--sidebar:#f3f1ee;--soft:#f5f4f2;--hover:#ece9e5;--ink:#28262d;--muted:#716e78;--faint:#908c96;--line:#e6e3df;--accent:#7255ad;--accent-soft:#eee8f8;--accent-ink:#6745a0;--avatar:#f0dacb;--bird:#805140;--success:#33725b;--success-bg:#edf5ef;--warning:#956528;--warning-bg:#faf2df;--danger:#b44646;--danger-bg:#fff0ee;--shadow:0 12px 48px #24202c15;--sidebar-width:236px;--context-width:288px;--radius:12px;--focus:0 0 0 3px #7255ad26;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,PingFang SC,Microsoft 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12px;display:flex}.file-card:hover{background:var(--soft);border-color:var(--faint)}.file-icon{background:var(--accent-soft);width:35px;height:39px;color:var(--accent-ink);border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.file-icon.sheet{color:var(--success);background:var(--success-bg)}.file-card>span:nth-child(2){flex:1;min-width:0}.file-card strong{text-overflow:ellipsis;white-space:nowrap;font-size:12px;display:block;overflow:hidden}.file-card small{color:var(--muted);margin-top:3px;font-size:10px;display:block}.file-arrow{color:var(--muted)}.supplement-label{color:var(--accent-ink);margin-bottom:5px;font-size:10px;display:inline-block}.live-reply{margin:0 0 25px}.working{color:var(--muted);align-items:center;gap:8px;font-size:12px;display:flex}.working-label{text-align:left;flex:1;font-size:12px}.working-label:hover{text-decoration:underline}.thinking-dots{align-items:center;gap:3px;height:15px;display:inline-flex}.thinking-dots 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h1{letter-spacing:-1px;margin:14px 0 16px;font-size:32px;font-weight:550;line-height:1.45}.welcome>p{color:var(--muted);font-size:13px;line-height:1.9}.suggestions{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;max-width:620px;margin:35px auto 0;display:grid}.suggestions button{background:var(--surface);border:1px solid var(--line);text-align:left;border-radius:10px;align-items:center;gap:8px;padding:13px 11px;font-size:11px;display:flex}.suggestions button:hover{border-color:var(--accent);background:var(--accent-soft)}.suggestions button>svg:first-child{color:var(--accent-ink)}.suggestions button>svg:last-child{color:var(--faint);margin-left:auto}.composer-wrap{flex-shrink:0;width:min(100%,850px);margin:0 auto;padding:6px 30px 13px}.composer{background:var(--surface);border:1px solid color-mix(in srgb,var(--faint) 45%,var(--line));border-radius:16px;overflow:hidden;box-shadow:0 3px 12px 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