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var(--border-primary);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.input-area{border-top:1px solid var(--border-primary);background:var(--bg-input);padding:16px 24px 24px;flex-shrink:0;max-height:60vh;overflow-y:auto}.input-form{display:flex;align-items:flex-end;gap:12px}.message-input{flex:1;padding:14px;background:var(--bg-input-field);border:1px solid var(--border-input);border-radius:8px;color:var(--text-primary);font-size:15px;font-family:inherit;line-height:1.5;outline:none;resize:vertical;min-height:80px;max-height:300px}.message-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--shadow-focus)}.message-input:disabled{opacity:.5;cursor:not-allowed;background:var(--bg-disabled)}.send-button{padding:14px 28px;background:var(--color-primary);border:1px solid var(--color-primary);border-radius:8px;color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background .2s;white-space:nowrap;align-self:flex-end}.send-button:hover:not(:disabled){background:var(--color-primary-hover);border-color:var(--color-primary-hover)}.send-button:disabled{opacity:.5;cursor:not-allowed;background:var(--bg-disabled-btn);border-color:var(--bg-disabled-btn)}.attach-button{display:flex;align-items:center;justify-content:center;width:44px;height:44px;flex-shrink:0;padding:0;background:var(--bg-card);border:1px solid var(--border-secondary);border-radius:8px;color:var(--text-secondary);cursor:pointer;transition:border-color .2s,color .2s;align-self:flex-end}.attach-button:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-primary)}.attach-button:disabled{opacity:.4;cursor:not-allowed}.attachment-preview-strip{display:flex;flex-wrap:wrap;gap:8px;padding:8px 0 4px}.attachment-preview-item{display:flex;align-items:center;gap:8px;padding:6px 10px;background:var(--bg-card);border:1px solid var(--border-user-msg);border-radius:8px;font-size:13px;color:var(--text-primary);max-width:280px}.attachment-thumbnail{width:40px;height:40px;object-fit:cover;border-radius:4px;flex-shrink:0}.attachment-file-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--color-primary-light);border-radius:4px;flex-shrink:0}.attachment-file-ext{font-size:10px;font-weight:700;color:var(--color-primary);text-transform:uppercase}.attachment-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:120px;font-weight:500}.attachment-size{color:var(--text-faint);font-size:11px;white-space:nowrap}.attachment-remove{background:none;border:none;font-size:18px;line-height:1;color:var(--text-faint);cursor:pointer;padding:0 2px;flex-shrink:0;transition:color .15s}.attachment-remove:hover{color:var(--color-danger-accent)}.refine-panel{border-top:1px solid #e0e0e0;background:#f8f9fb;padding:16px 20px;flex-shrink:1;max-height:40vh;overflow-y:auto}.refine-loading{display:flex;align-items:center;gap:10px;color:#666;font-size:14px}.refine-header{margin-bottom:12px}.refine-header strong{font-size:15px;color:#333}.refine-subtext{display:block;font-size:13px;color:#888;margin-top:2px}.refine-qa{margin-bottom:12px}.refine-question{display:block;font-size:14px;font-weight:500;color:#444;margin-bottom:4px}.refine-answer{width:100%;border:1px solid #d0d0d0;border-radius:6px;padding:8px 10px;font-size:14px;font-family:inherit;resize:vertical;background:#fff}.refine-answer:focus{outline:none;border-color:#4a90e2;box-shadow:0 0 0 2px #4a90e226}.refine-actions{display:flex;gap:10px;margin-top:14px}.refine-btn{padding:8px 18px;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;border:none}.refine-btn-primary{background:#4a90e2;color:#fff}.refine-btn-primary:hover{background:#357abd}.refine-btn-secondary{background:transparent;color:#666;border:1px solid #ccc}.refine-btn-secondary:hover{background:#f0f0f0}.refined-prompt-banner{background:#f0f4ff;border:1px solid #c8d8f0;border-radius:8px;padding:12px 16px;margin-bottom:12px}.refined-prompt-label{font-size:12px;font-weight:600;color:#4a70b0;text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px}.refined-prompt-text{font-size:14px;color:#333;line-height:1.6;white-space:pre-wrap}.preflight-banner{margin:0 24px 8px;padding:12px 16px;border-radius:8px;font-size:13px;flex-shrink:0}.preflight-checking{display:flex;align-items:center;gap:10px;background:var(--bg-hover, #f0f4ff);color:var(--text-secondary, #555);border:1px solid var(--border-color, #d0d7e3)}.preflight-error{background:#fff5f5;border:1px solid #e8aaaa;color:#8b2020}[data-theme=dark] .preflight-error{background:#2d1a1a;border-color:#5a2a2a;color:#f0b0b0}.preflight-error-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.preflight-dismiss{background:none;border:none;font-size:18px;cursor:pointer;color:inherit;opacity:.6;padding:0 4px}.preflight-dismiss:hover{opacity:1}.preflight-error-list{list-style:none;padding:0;margin:0 0 8px}.preflight-error-list li{padding:4px 0;display:flex;gap:8px;align-items:baseline}.preflight-model-name{font-weight:600;white-space:nowrap}.preflight-model-error{opacity:.85;font-size:12px}.preflight-error-hint{font-size:12px;opacity:.7;margin-top:4px}.upload-error-banner{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;margin:0 24px 8px;padding:12px 16px;border-radius:8px;font-size:13px;flex-shrink:0;background:#fff5f5;border:1px solid #e8aaaa;color:#8b2020}[data-theme=dark] .upload-error-banner{background:#2d1a1a;border-color:#5a2a2a;color:#f0b0b0}.upload-error-dismiss{border:none;background:transparent;color:inherit;font-size:16px;line-height:1;cursor:pointer;padding:0 2px;opacity:.7}.upload-error-dismiss:hover{opacity:1}.attachment-warning-banner{margin:0 0 12px;padding:10px 14px;border-radius:8px;font-size:13px;background:#fffaf0;border:1px solid #e6cf9a;color:#7a5c1e}[data-theme=dark] .attachment-warning-banner{background:#2b2416;border-color:#5a4a26;color:#e8cf8f}.attachment-warning-item+.attachment-warning-item{margin-top:6px}.stream-error-banner{margin:0 0 12px;padding:12px 16px;border-radius:8px;font-size:13px;background:#fff5f5;border:1px solid #e8aaaa;color:#8b2020}[data-theme=dark] .stream-error-banner{background:#2d1a1a;border-color:#5a2a2a;color:#f0b0b0}.login-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg-body, #f5f6fa)}.login-card{display:flex;flex-direction:column;gap:12px;width:320px;padding:32px 28px;border-radius:12px;background:var(--bg-card, #ffffff);border:1px solid var(--border-primary, #e0e3ea);box-shadow:0 8px 30px #00000014}.login-title{margin:0;font-size:22px;text-align:center;color:var(--text-primary, #1c2033)}.login-subtitle{margin:0 0 8px;font-size:13px;text-align:center;color:var(--text-muted, #7a8194)}.login-input{padding:10px 12px;font-size:14px;border-radius:8px;border:1px solid var(--border-input, #d5d9e2);background:var(--bg-input-field, #ffffff);color:var(--text-primary, #1c2033);outline:none}.login-input:focus{border-color:var(--color-primary, #4a90e2)}.login-error{font-size:13px;color:#d64545;text-align:center}.login-button{margin-top:4px;padding:10px 12px;font-size:14px;font-weight:600;border:none;border-radius:8px;background:var(--color-primary, #4a90e2);color:#fff;cursor:pointer}.login-button:disabled{opacity:.6;cursor:default}*{box-sizing:border-box}.app{display:flex;height:100vh;width:100vw;overflow:hidden;background:var(--bg-app);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif}.theme-toggle{position:fixed;top:12px;right:16px;z-index:1000;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--bg-theme-toggle);border:1px solid var(--border-theme-toggle);border-radius:50%;cursor:pointer;font-size:18px;line-height:1;color:var(--color-theme-toggle);transition:background-color .3s,border-color .3s,transform .2s}.theme-toggle:hover{background:var(--bg-theme-toggle-hover);transform:scale(1.1)}.logout-button{position:fixed;top:12px;right:60px;z-index:1000;height:36px;padding:0 14px;background:var(--bg-theme-toggle);border:1px solid var(--border-theme-toggle);border-radius:18px;color:var(--text-secondary, #666);font-size:13px;cursor:pointer}.logout-button:hover{color:var(--text-primary, #222)}