:root{--navy-900: #0d1b2a;--navy-800: #13253a;--navy-700: #1b3350;--navy-100: #dbe4ee;--ink: #1f2937;--ink-soft: #55606e;--canvas: #f7f8fa;--card: #ffffff;--line: #e4e8ee;--accent: #f58220;--accent-deep: #d96a0b;--ok: #1a9a6c;--bad: #d64545;--user-bubble: #eef3fa;--radius: 12px;--mono: ui-monospace, "Cascadia Mono", "JetBrains Mono", "SF Mono", Consolas, monospace;--shadow: 0 1px 3px rgba(13, 27, 42, .08), 0 4px 16px rgba(13, 27, 42, .06);font-family:Segoe UI,system-ui,-apple-system,sans-serif;--attach-purple: #6b46f0;--attach-purple-deep: #5636c9;--attach-purple-soft: #efe9fe;--attach-purple-line: #d9cdfa}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--canvas);color:var(--ink)}.app{display:grid;grid-template-columns:288px 1fr;height:100%;overflow:hidden;transition:grid-template-columns .18s ease}.app.sidebar-collapsed{grid-template-columns:0 1fr}.app.sidebar-collapsed .sidebar{transform:translate(-100%);pointer-events:none}@media 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button{background:none;border:none;color:#b56a6a;cursor:pointer;font-size:12.5px}.composer{padding:10px 20px 16px;background:linear-gradient(180deg,transparent,var(--canvas) 40%)}.composer-box{position:relative;max-width:780px;margin:0 auto;display:flex;gap:10px;align-items:flex-end;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px 12px;box-shadow:var(--shadow);transition:border-color .14s,box-shadow .14s}.composer-box:focus-within{border-color:#e9b57e;box-shadow:var(--shadow),0 0 0 3px #f582201f}.composer textarea{flex:1;border:none;outline:none;resize:none;font:inherit;font-size:14.5px;line-height:1.5;max-height:160px;background:transparent}.btn-send{width:36px;height:36px;border-radius:50%;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;background:var(--accent);color:#fff;border:none;cursor:pointer;transition:background 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8px;display:flex;flex-wrap:wrap;gap:8px}.attach-chip{display:inline-flex;align-items:center;gap:9px;background:var(--card);border:1px solid var(--attach-purple-line);color:var(--ink);border-radius:10px;padding:7px 8px 7px 10px;width:232px;box-shadow:0 1px 2px #0d1b2a0d}.attach-file-icon{color:var(--attach-purple);flex-shrink:0}.attach-chip-text{display:flex;flex-direction:column;min-width:0;flex:1;gap:1px}.attach-chip-name{font-size:12.5px;font-weight:550;line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.attach-chip-meta{font-size:11px;color:var(--ink-soft);line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.attach-chip-status{display:inline-flex;flex-shrink:0;color:var(--ok)}.attach-chip-done .attach-chip-status{color:var(--ok)}.attach-chip-error{background:#fdf2f2;border-color:#f2caca}.attach-chip-error .attach-file-icon,.attach-chip-error .attach-chip-status,.attach-chip-error 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