:root,[data-theme=light]{--bg-primary:#fff;--bg-secondary:#f3ecd8;--bg-tertiary:#faf8f3;--bg-card:#fff;--bg-input:#fff;--bg-hover:#0000000d;--text-primary:#2d2d2d;--text-secondary:#5f5f5f;--text-muted:#8c8c8c;--text-heading:#1a1a1a;--accent-primary:#d97757;--accent-secondary:#c46445;--accent-subtle:#d977571a;--success:#16a34a;--error:#dc2626;--border:#e5e5e5;--border-hover:#d4d4d4;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 12px #00000014;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-full:9999px;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-normal:.25s cubic-bezier(.4, 0, .2, 1)}[data-theme=dark]{--bg-primary:#1a1a1a;--bg-secondary:#262626;--bg-tertiary:#1f1f1f;--bg-card:#262626;--bg-input:#2d2d2d;--bg-hover:#ffffff14;--text-primary:#ececec;--text-secondary:#a3a3a3;--text-muted:#737373;--text-heading:#fff;--accent-primary:#d97757;--accent-secondary:#eda289;--accent-subtle:#d9775726;--border:#404040;--border-hover:#525252;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;transition:background-color var(--transition-normal), color var(--transition-normal);line-height:1.6;overflow-x:hidden}#root{flex-direction:column;min-height:100vh;display:flex}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}::selection{background:var(--accent-subtle);color:var(--accent-primary)}:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:.4}50%{opacity:1}}@keyframes spin{to{transform:rotate(360deg)}}.app{flex-direction:column;height:100vh;display:flex;overflow:hidden}.header{background:var(--bg-primary);border-bottom:1px solid var(--border);z-index:10;justify-content:space-between;align-items:center;padding:12px 24px;display:flex}.header-brand{color:var(--text-heading);align-items:center;gap:12px;font-size:18px;font-weight:600;display:flex}.header-badge{background:var(--accent-subtle);color:var(--accent-primary);border-radius:var(--radius-full);letter-spacing:.03em;padding:2px 8px;font-size:11px;font-weight:500}.header-logo{font-size:20px}.header-actions{align-items:center;gap:16px;display:flex}.theme-toggle{border:1px solid var(--border);color:var(--text-secondary);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast);background:0 0;align-items:center;gap:6px;padding:6px 12px;font-size:14px;display:flex}.theme-toggle:hover{background:var(--bg-hover);color:var(--text-primary)}.app-layout{flex:1;display:flex;overflow:hidden}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;width:280px;display:flex}.sidebar-section{flex-direction:column;flex:1;padding:16px;display:flex;overflow:hidden}.sidebar-header{justify-content:space-between;align-items:center;margin-bottom:12px;padding:0 8px;display:flex}.sidebar-title{color:var(--text-heading);text-transform:uppercase;letter-spacing:.05em;font-size:13px;font-weight:600}.sidebar-divider{border:none;border-top:1px solid var(--border);margin:0}.add-btn{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;width:28px;height:28px;color:var(--text-primary);transition:all var(--transition-fast);background:0 0;justify-content:center;align-items:center;font-size:18px;display:flex}.add-btn:hover{background:var(--bg-hover);border-color:var(--text-muted)}.item-list{flex-direction:column;flex:1;gap:6px;display:flex;overflow-y:auto}.sidebar-item{border-radius:var(--radius-md);color:var(--text-primary);transition:all var(--transition-fast);cursor:pointer;background:0 0;border:1px solid #0000;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;font-size:14px;display:flex}.sidebar-item-content{flex:1;align-items:center;gap:10px;min-width:0;display:flex}.sidebar-item:hover{background:var(--bg-hover)}.sidebar-item.active{background:var(--bg-primary);border-color:var(--border);box-shadow:var(--shadow-sm)}.item-icon{flex-shrink:0;font-size:16px}.item-name{white-space:nowrap;text-overflow:ellipsis;flex:1;font-weight:500;overflow:hidden}.item-meta{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:11px;overflow:hidden}.sidebar-item:hover .delete-btn{opacity:1}.delete-btn{color:var(--text-muted);cursor:pointer;opacity:.3;transition:all var(--transition-fast);background:0 0;border:none;padding:0 4px;font-size:18px;line-height:1}.delete-btn:hover{color:var(--error);opacity:1}.empty-text{text-align:center;color:var(--text-muted);padding:24px 12px;font-size:13px}.pipeline-legend{border-top:1px solid var(--border);flex-shrink:0;padding:12px 16px}.legend-title{text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:8px;font-size:11px;font-weight:600}.legend-item{color:var(--text-secondary);align-items:center;gap:4px;padding:2px 0;font-size:11px;display:flex}.main-chat-area{background:var(--bg-primary);flex-direction:column;flex:1;display:flex;position:relative}.messages-container{scroll-behavior:smooth;flex-direction:column;flex:1;gap:32px;padding:32px 24px;display:flex;overflow-y:auto}.welcome-message{text-align:center;color:var(--text-muted);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:16px;animation:.5s ease-out fadeIn;display:flex}.welcome-icon{margin-bottom:4px;font-size:52px}.welcome-message h2{color:var(--text-heading);margin-bottom:0;font-size:28px;font-weight:600}.feature-chips{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:8px;display:flex}.chip{background:var(--bg-tertiary);border:1px solid var(--border);color:var(--text-secondary);border-radius:var(--radius-full);padding:4px 12px;font-size:12px;font-weight:500}.message{gap:16px;width:100%;max-width:800px;margin:0 auto;animation:.3s ease-out slideUp;display:flex}.message-avatar{border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;margin-top:4px;font-size:16px;display:flex}.message-user .message-avatar{background:var(--bg-hover)}.message-assistant .message-avatar{background:var(--accent-subtle);color:var(--accent-primary)}.message-body{min-width:0;color:var(--text-primary);flex:1;font-size:15px;line-height:1.6}.message-sender{color:var(--text-heading);margin-bottom:4px;font-size:14px;font-weight:600}.message-content p{margin-bottom:16px}.message-content p:last-child{margin-bottom:0}.message-content code{background:var(--bg-secondary);font-family:var(--font-mono);border-radius:4px;padding:2px 6px;font-size:13.5px}.sources{margin-top:16px}.sources-toggle{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);align-items:center;gap:6px;padding:6px 12px;font-size:12px;display:inline-flex}.sources-toggle:hover{background:var(--bg-hover);color:var(--text-primary)}.sources-list{flex-direction:column;gap:8px;margin-top:12px;display:flex}.source-item{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);gap:12px;padding:12px;font-size:13px;display:flex}.source-page{background:var(--accent-subtle);color:var(--accent-primary);border-radius:var(--radius-full);height:fit-content;padding:2px 8px;font-size:11px;font-weight:600}.source-preview{color:var(--text-secondary);flex:1}.source-score{color:var(--text-muted);font-size:11px}.source-section{color:var(--accent-primary);font-size:11px;font-weight:500}.source-chunkid{color:var(--text-muted);font-size:10px;font-family:var(--font-mono);margin-top:2px;margin-bottom:4px}.input-area-container{background:linear-gradient(transparent, var(--bg-primary) 20%);justify-content:center;padding:0 24px 24px;display:flex}.input-wrapper{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:800px;box-shadow:var(--shadow-md);transition:border-color var(--transition-fast);align-items:flex-end;padding:8px;display:flex;position:relative}.input-wrapper:focus-within{border-color:var(--accent-primary)}.input-field{color:var(--text-primary);font-size:15px;font-family:var(--font-sans);resize:none;background:0 0;border:none;flex:1;min-height:48px;max-height:200px;padding:12px 16px;line-height:1.5}.input-field:focus{outline:none}.input-field::placeholder{color:var(--text-muted)}.send-btn{background:var(--text-primary);color:var(--bg-primary);cursor:pointer;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;margin:6px;transition:all .2s;display:flex}.send-btn:hover:not(:disabled){opacity:.9;transform:scale(1.05)}.send-btn:disabled{opacity:.3;cursor:not-allowed}.upload-overlay{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:50;background:#ffffffd9;flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}[data-theme=dark] .upload-overlay{background:#121212e0}.upload-progress-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);min-width:320px;padding:28px 36px}.upload-progress-title{color:var(--text-heading);text-align:center;margin-bottom:20px;font-size:16px;font-weight:600}.upload-steps{flex-direction:column;gap:10px;display:flex}.upload-step{align-items:center;gap:10px;font-size:13px;transition:all .3s;display:flex}.upload-step.pending{color:var(--text-muted);opacity:.5}.upload-step.active{color:var(--accent-primary);font-weight:600}.upload-step.done{color:var(--text-secondary)}.step-indicator{text-align:center;flex-shrink:0;width:20px;font-size:14px}.upload-step.active .step-indicator{animation:1s linear infinite spin;display:inline-block}.spinner{border:3px solid var(--border);border-top-color:var(--accent-primary);border-radius:50%;width:40px;height:40px;margin-bottom:16px;animation:.8s linear infinite spin}.error-toast{background:var(--error);color:#fff;border-radius:var(--radius-md);z-index:1000;box-shadow:var(--shadow-md);padding:12px 24px;font-size:14px;animation:.3s ease-out slideUp;position:fixed;bottom:24px;left:50%;transform:translate(-50%)}.thinking-container{align-items:center;gap:12px;padding:4px 0;display:flex}.thinking-dots{gap:6px;display:flex}.thinking-dots span{background:var(--accent-primary);border-radius:50%;width:6px;height:6px;animation:1.4s ease-in-out infinite pulse}.thinking-dots span:nth-child(2){animation-delay:.2s}.thinking-dots span:nth-child(3){animation-delay:.4s}.thinking-step{color:var(--text-muted);font-size:12px;font-style:italic;animation:.4s fadeIn}.pipeline-info{margin-top:12px}.pipeline-toggle{border:1px dashed var(--border);color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);background:0 0;align-items:center;gap:6px;padding:4px 10px;font-size:11px;display:inline-flex}.pipeline-toggle:hover{background:var(--bg-hover);color:var(--text-secondary)}.pipeline-details{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);flex-direction:column;gap:6px;margin-top:8px;padding:10px 14px;display:flex}.pipeline-row{align-items:flex-start;gap:10px;font-size:12px;display:flex}.pipeline-label{color:var(--text-muted);flex-shrink:0;min-width:160px}.pipeline-value{color:var(--text-secondary);word-break:break-word;font-weight:500}@media (width<=768px){.app-layout{flex-direction:column}.sidebar{border-right:none;border-bottom:1px solid var(--border);width:100%;height:300px}.sidebar-section{flex:none;height:50%}}