:root{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-bg: #ffffff;--color-bg-secondary: #f8fafc;--color-bg-tertiary: #f1f5f9;--color-sidebar-bg: #1e293b;--color-sidebar-fg: #e2e8f0;--color-sidebar-hover: #334155;--color-text: #0f172a;--color-text-muted: #64748b;--color-border: #e2e8f0;--color-success: #16a34a;--color-warning: #ea580c;--color-error: #dc2626;--shadow-sm: 0 1px 2px 0 rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1);--radius: 8px;--radius-sm: 4px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15px;color:var(--color-text);background:var(--color-bg)}button{font-family:inherit;font-size:inherit;cursor:pointer;border:none;background:none}.btn{padding:8px 16px;border-radius:var(--radius-sm);font-weight:500;transition:all .15s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover)}.btn-ghost{background:transparent;color:var(--color-text-muted)}.btn-ghost:hover{color:var(--color-text)}.loading-screen,.login-page{height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1e293b,#2563eb)}.login-card{background:#fff;padding:48px;border-radius:12px;box-shadow:0 20px 25px -5px #0000001a;max-width:420px;width:90%;text-align:center}.login-logo{font-size:48px;margin-bottom:16px}.login-card h1{font-size:24px;margin-bottom:12px}.login-subtitle{color:var(--color-text-muted);margin-bottom:24px;line-height:1.5}.login-btn{width:100%;padding:12px;font-size:16px}.login-footer{margin-top:24px;font-size:13px;color:var(--color-text-muted)}.app-layout{display:grid;grid-template-columns:280px 1fr;height:100vh}.main-content{display:flex;flex-direction:column;height:100vh;overflow:hidden}.sidebar{background:var(--color-sidebar-bg);color:var(--color-sidebar-fg);display:flex;flex-direction:column;padding:16px}.new-chat-btn{width:100%;padding:10px;margin-bottom:16px;background:var(--color-primary)}.conversation-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:4px}.conversation-empty{text-align:center;padding:24px;color:#94a3b8;font-size:13px}.conversation-item{padding:10px 12px;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:14px;transition:background .15s}.conversation-item:hover{background:var(--color-sidebar-hover)}.conversation-item.active{background:var(--color-primary)}.conversation-title{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conversation-delete{color:#94a3b8;font-size:18px;width:20px;height:20px;display:none;border-radius:4px}.conversation-item:hover .conversation-delete{display:block}.conversation-delete:hover{color:#fff;background:#ffffff1a}.app-header{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;border-bottom:1px solid var(--color-border);background:#fff}.header-title{font-weight:600;font-size:16px}.header-user{display:flex;align-items:center;gap:12px}.user-info{display:flex;flex-direction:column;text-align:right;font-size:13px;line-height:1.3}.user-role{color:var(--color-text-muted);font-size:11px;text-transform:uppercase}.customer-bar{display:flex;align-items:center;gap:16px;padding:12px 24px;background:var(--color-bg-secondary);border-bottom:1px solid var(--color-border);font-size:14px}.customer-selector{display:flex;align-items:center;gap:8px}.customer-selector label{color:var(--color-text-muted)}.customer-selector select{padding:6px 10px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:#fff;font-family:inherit;font-size:inherit;min-width:240px}.detected-badge{background:#fef3c7;color:#78350f;padding:4px 10px;border-radius:999px;font-size:13px}.messages-container{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:20px;max-width:980px;width:100%;margin:0 auto}.empty-state{text-align:center;padding:60px 20px;color:var(--color-text-muted)}.empty-state h2{margin-bottom:12px;color:var(--color-text)}.empty-state p{max-width:540px;margin:0 auto 24px;line-height:1.6}.suggestion-chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.chip{padding:8px 14px;background:#fff;border:1px solid var(--color-border);border-radius:999px;font-size:13px;color:var(--color-text);cursor:pointer;transition:all .15s}.chip:hover{border-color:var(--color-primary);color:var(--color-primary)}.message{display:flex;gap:12px}.message-avatar{width:32px;height:32px;border-radius:50%;background:var(--color-bg-tertiary);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}.message-user .message-avatar{background:var(--color-primary);color:#fff}.message-body{flex:1;min-width:0}.message-content{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius);padding:14px 18px;line-height:1.6;word-wrap:break-word}.message-user .message-content{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.message-content h1,.message-content h2,.message-content h3,.message-content h4{margin:16px 0 8px;font-weight:600}.message-content h1{font-size:20px}.message-content h2{font-size:17px}.message-content h3{font-size:15px}.message-content p{margin-bottom:12px}.message-content p:last-child{margin-bottom:0}.message-content ul,.message-content ol{padding-left:24px;margin-bottom:12px}.message-content li{margin-bottom:4px}.message-content code{background:var(--color-bg-tertiary);padding:2px 6px;border-radius:4px;font-family:ui-monospace,SF Mono,monospace;font-size:13px}.message-content pre{background:var(--color-bg-tertiary);padding:12px;border-radius:var(--radius-sm);overflow-x:auto;margin-bottom:12px}.message-content pre code{background:none;padding:0}.message-content table{border-collapse:collapse;margin-bottom:12px}.message-content th,.message-content td{border:1px solid var(--color-border);padding:6px 12px;text-align:left}.message-content th{background:var(--color-bg-tertiary);font-weight:600}.message-sources{margin-top:8px}.sources-toggle{font-size:13px;color:var(--color-text-muted);padding:4px 8px;border-radius:var(--radius-sm);transition:all .15s}.sources-toggle:hover{background:var(--color-bg-tertiary);color:var(--color-text)}.source-list{margin-top:8px;display:flex;flex-direction:column;gap:8px}.source-item{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:10px 12px;font-size:13px}.source-header{display:flex;align-items:center;gap:8px;margin-bottom:4px}.source-title{flex:1;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.source-score{color:var(--color-text-muted);font-size:12px;font-variant-numeric:tabular-nums}.source-meta{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:4px}.source-tag{background:#fff;padding:1px 8px;border-radius:999px;font-size:11px;border:1px solid var(--color-border)}.source-tag.source-type{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.source-path{color:var(--color-text-muted);font-size:11px;font-family:ui-monospace,monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.message-actions{display:flex;gap:4px;margin-top:8px}.feedback-btn{padding:4px 10px;border-radius:var(--radius-sm);font-size:14px;background:transparent;transition:all .15s}.feedback-btn:hover,.feedback-btn.active{background:var(--color-bg-tertiary)}.input-bar{display:flex;gap:12px;padding:16px 24px;border-top:1px solid var(--color-border);background:#fff;max-width:980px;width:100%;margin:0 auto}.input-textarea{flex:1;padding:10px 14px;border:1px solid var(--color-border);border-radius:var(--radius);font-family:inherit;font-size:15px;resize:none;outline:none;transition:border-color .15s}.input-textarea:focus{border-color:var(--color-primary)}.input-bar .btn{align-self:flex-end;padding:10px 24px}@media (max-width: 768px){.app-layout{grid-template-columns:1fr}.sidebar{display:none}}