body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;padding:0}*{box-sizing:border-box;margin:0;padding:0}:root{--sidebar-width:280px;--primary:#2563eb;--primary-hover:#1d4ed8;--bg:#f8fafc;--bg-card:#fff;--text:#1e293b;--text-muted:#64748b;--border:#e2e8f0;--user-bubble:#2563eb;--user-text:#fff;--assistant-bubble:#f1f5f9;--assistant-text:#1e293b;--error-bg:#fef2f2;--error-text:#dc2626}html,body,#root{background:var(--bg);height:100%;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app-layout{height:100vh;display:flex}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-card);border-right:1px solid var(--border);flex-direction:column;display:flex}.sidebar-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px;display:flex}.sidebar-header h2{font-size:16px;font-weight:600}.new-chat-btn{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:6px 12px;font-size:13px}.new-chat-btn:hover{background:var(--primary-hover)}.sidebar-list{flex:1;padding:8px;overflow-y:auto}.sidebar-loading,.sidebar-empty{text-align:center;color:var(--text-muted);padding:24px 8px;font-size:13px}.sidebar-item{cursor:pointer;border-radius:8px;align-items:center;gap:4px;margin-bottom:2px;padding:10px 12px;display:flex}.sidebar-item:hover{background:#f1f5f9}.sidebar-item.active{background:#eff6ff}.sidebar-item-content{flex:1;min-width:0}.sidebar-preview{white-space:nowrap;text-overflow:ellipsis;font-size:13px;display:block;overflow:hidden}.sidebar-count{color:var(--text-muted);font-size:11px}.sidebar-delete{color:var(--text-muted);cursor:pointer;opacity:0;background:0 0;border:none;border-radius:4px;padding:2px 6px;font-size:16px;transition:opacity .15s}.sidebar-item:hover .sidebar-delete{opacity:1}.sidebar-delete:hover{color:var(--error-text);background:#fee2e2}.main-content{flex-direction:column;flex:1;min-width:0;display:flex}.chat-widget{flex-direction:column;flex:1;width:100%;max-width:800px;height:100vh;margin:0 auto;display:flex}.chat-body{flex:1;padding:16px;overflow-y:auto}.chat-error{background:var(--error-bg);color:var(--error-text);cursor:pointer;text-align:center;padding:10px 16px;font-size:13px}.message-list{flex-direction:column;gap:16px;display:flex}.message-row{gap:10px;max-width:85%;display:flex}.message-row.user{flex-direction:row-reverse;align-self:flex-end}.message-row.assistant{align-self:flex-start}.message-avatar{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:13px;font-weight:700;display:flex}.message-row.user .message-avatar{background:var(--user-bubble);color:var(--user-text)}.message-row.assistant .message-avatar{background:var(--assistant-bubble);color:var(--assistant-text)}.message-body{min-width:0}.message-bubble{white-space:pre-wrap;word-break:break-word;border-radius:14px;padding:10px 14px;font-size:14px;line-height:1.5}.message-row.user .message-bubble{background:var(--user-bubble);color:var(--user-text);border-bottom-right-radius:4px}.message-row.assistant .message-bubble{background:var(--assistant-bubble);color:var(--assistant-text);border-bottom-left-radius:4px}.message-sources{margin-top:6px;font-size:12px}.message-sources summary{color:var(--text-muted);cursor:pointer;padding:4px 2px}.source-item{background:var(--bg-card);border:1px solid var(--border);border-radius:6px;margin-top:6px;padding:8px}.source-doc{margin-right:8px;font-size:12px;font-weight:600;display:inline-block}.source-score{color:var(--primary);background:#eff6ff;border-radius:4px;padding:1px 6px;font-size:11px}.source-excerpt{color:var(--text-muted);margin-top:4px;font-size:12px;line-height:1.4}.chat-input{border-top:1px solid var(--border);background:var(--bg-card);align-items:flex-end;gap:8px;padding:12px 16px 16px;display:flex}.chat-input textarea{border:1px solid var(--border);resize:none;border-radius:12px;outline:none;flex:1;padding:10px 14px;font-family:inherit;font-size:14px;line-height:1.4}.chat-input textarea:focus{border-color:var(--primary);box-shadow:0 0 0 2px #2563eb33}.chat-input button{background:var(--primary);color:#fff;cursor:pointer;white-space:nowrap;border:none;border-radius:12px;padding:10px 20px;font-size:14px;font-weight:500}.chat-input button:hover:not(:disabled){background:var(--primary-hover)}.chat-input button:disabled{opacity:.5;cursor:default}.empty-state{text-align:center;height:100%;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;padding:32px;display:flex}.empty-icon{margin-bottom:16px;font-size:48px}.empty-state h1{color:var(--text);margin-bottom:8px;font-size:22px}.empty-state p{max-width:400px;margin-bottom:24px;font-size:14px}.suggestions{flex-direction:column;align-items:center;gap:8px;display:flex}.suggestion-label{text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px;font-size:12px}.suggestion-chip{background:var(--bg-card);border:1px solid var(--border);cursor:pointer;text-align:left;width:100%;max-width:320px;color:var(--text);border-radius:20px;padding:10px 16px;font-size:13px}.suggestion-chip:hover{border-color:var(--primary);background:#eff6ff}.login-screen{background:var(--bg);justify-content:center;align-items:center;height:100vh;display:flex}.login-card{background:var(--bg-card);border:1px solid var(--border);text-align:center;border-radius:16px;width:100%;max-width:360px;padding:40px 32px;box-shadow:0 4px 24px #0000000f}.login-icon{margin-bottom:12px;font-size:40px}.login-card h1{color:var(--text);margin-bottom:4px;font-size:20px;font-weight:600}.login-card p{color:var(--text-muted);margin-bottom:24px;font-size:13px}.login-form{flex-direction:column;gap:12px;display:flex}.login-form input{border:1px solid var(--border);border-radius:10px;outline:none;padding:10px 14px;font-family:inherit;font-size:14px}.login-form input:focus{border-color:var(--primary);box-shadow:0 0 0 2px #2563eb33}.login-error{color:var(--error-text);font-size:13px}.login-form button{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:10px;font-size:14px;font-weight:500}.login-form button:hover{background:var(--primary-hover)}@media (width<=768px){.sidebar{z-index:10;height:100vh;display:none;position:fixed;top:0;left:0}.sidebar.open{display:flex}.chat-widget{max-width:100%;padding:0}}