:root{--bg: #f8fafc;--bg-card: #ffffff;--sidebar-bg: #0f172a;--sidebar-text: #94a3b8;--sidebar-active: #ffffff;--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--danger-hover: #dc2626;--text: #1e293b;--text-secondary: #64748b;--text-muted: #94a3b8;--border: #e2e8f0;--radius: 10px;--radius-sm: 6px;--shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 12px rgba(0,0,0,.08);--transition: .15s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}.app-layout{display:flex;min-height:100vh}.sidebar{width:220px;background:var(--sidebar-bg);color:#fff;display:flex;flex-direction:column;flex-shrink:0;position:fixed;top:0;left:0;bottom:0;z-index:50}.sidebar-brand{padding:20px 20px 16px;border-bottom:1px solid 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.15s}.qa-input-bar textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51f}.qa-send-btn{padding:10px 20px;background:var(--primary);color:#fff;border:none;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s;white-space:nowrap;flex-shrink:0}.qa-send-btn:hover:not(:disabled){background:var(--primary-hover)}.qa-send-btn:disabled{opacity:.4;cursor:not-allowed}.qa-stop-btn{background:var(--danger)}.qa-stop-btn:hover{background:var(--danger-hover)}.qa-loading{display:flex;align-items:center;justify-content:center;height:60vh;color:var(--text-muted);font-size:14px}.qa-sources-bar{margin-top:16px;padding:12px 14px;background:#f8fafc;border:1px solid var(--border);border-radius:8px}.qa-sources-label{font-size:12px;font-weight:700;color:var(--text-secondary);margin-bottom:8px;display:block}.qa-sources-list{display:flex;flex-direction:column;gap:4px}.qa-source-row{display:flex;align-items:center;gap:10px;padding:7px 10px;border-radius:6px;cursor:pointer;transition:background .12s;font-size:13px}.qa-source-row:hover{background:#eef2ff}.qa-source-num{background:var(--primary);color:#fff;font-weight:700;font-size:11px;width:20px;height:20px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.qa-source-name{flex:1;font-weight:500;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qa-source-page{color:var(--text-muted);font-size:11px;white-space:nowrap;flex-shrink:0}.qa-source-chip{display:none}.success-msg{padding:10px 14px;margin-bottom:12px;border-radius:6px;font-size:13px;background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}.kb-card-header>button{margin-left:4px}.folder-bar{padding:8px 0;margin-bottom:8px;border-bottom:1px solid var(--border)}.folder-chips{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.folder-chip{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;border-radius:16px;font-size:13px;cursor:pointer;background:var(--bg);color:var(--text-secondary);border:1px solid transparent;transition:all .12s;white-space:nowrap}.folder-chip:hover{background:var(--primary-light);color:var(--primary)}.folder-chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}.folder-chip.active .folder-count{background:#ffffff4d;color:#fff}.folder-chip.active .folder-delete-btn{color:#ffffffb3}.folder-chip.active .folder-delete-btn:hover{color:#fff}.folder-count{font-size:10px;background:var(--border);color:var(--text-muted);padding:1px 6px;border-radius:8px;min-width:18px;text-align:center}.folder-delete-btn{font-size:13px;line-height:1;cursor:pointer;color:var(--text-muted);margin-left:2px;padding:0 2px}.folder-delete-btn:hover{color:var(--danger)}.folder-chip-add{border:1px dashed var(--border);color:var(--text-muted);font-style:italic}.folder-chip-add:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.folder-chip-input{border:1px solid var(--primary)!important;padding:4px 8px!important}.doc-folder-badge{background:#f0f9ff;color:#0369a1;padding:1px 8px;border-radius:10px;font-size:11px;font-weight:500;border:1px solid #bae6fd}.folder-move-trigger:hover{background:#eef2ff!important;color:var(--primary)!important}.folder-popup-item:hover{background:var(--primary-light);color:var(--primary)}.doc-list-header{display:flex;align-items:center;padding:8px 18px;background:#f1f5f9;border-bottom:2px solid var(--border);font-weight:700;font-size:12px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;border-radius:6px 6px 0 0;margin-bottom:0;gap:0}.doc-list-col-icon{width:36px;flex-shrink:0}.doc-list-col-name{flex:1;padding-left:2px}.doc-list-col-folder{width:130px;text-align:center;flex-shrink:0}.doc-card-actions{width:130px;flex-shrink:0;display:flex;align-items:center;gap:4px;justify-content:flex-end}.doc-card-folder-col{width:130px;flex-shrink:0;display:flex;align-items:center;justify-content:center}.doc-list-col-actions{width:130px;text-align:center;flex-shrink:0}