*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #212121;--sidebar-bg: #171717;--input-bg: #2f2f2f;--text: #ececec;--text-muted: #9a9a9a;--accent: #2563eb;--accent-hover: #1d4ed8;--user-bubble: #2f2f2f;--border: #3f3f3f;--danger: #dc2626;--success: #16a34a;--sidebar-width: 260px}html,body,#root{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15px;color:var(--text);background:var(--bg)}.app{display:flex;height:100vh;overflow:hidden;position:relative}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--sidebar-bg);display:flex;flex-direction:column;border-right:1px solid var(--border);transition:transform .25s ease,width .25s ease;z-index:100;position:relative}.sidebar.collapsed{transform:translate(-100%);position:absolute;height:100%}.sidebar-overlay{display:none}.sidebar-header{display:flex;align-items:center;gap:8px;padding:12px;border-bottom:1px solid var(--border)}.new-chat-btn{flex:1;background:transparent;border:1px solid var(--border);color:var(--text);padding:8px 12px;border-radius:8px;cursor:pointer;font-size:14px;display:flex;align-items:center;gap:6px;transition:background .15s}.new-chat-btn:hover{background:var(--input-bg)}.sidebar-toggle-btn{background:transparent;border:none;color:var(--text-muted);font-size:18px;cursor:pointer;padding:6px 8px;border-radius:6px;transition:color .15s}.sidebar-toggle-btn:hover{color:var(--text)}.conv-list{flex:1;overflow-y:auto;padding:8px 6px;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.conv-empty{padding:20px;text-align:center;color:var(--text-muted);font-size:13px}.conv-item{padding:10px 10px 10px 12px;border-radius:8px;cursor:pointer;position:relative;transition:background .12s;margin-bottom:2px}.conv-item:hover{background:#ffffff0f}.conv-item.active{background:#2563eb2e}.conv-title{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding-right:20px;color:var(--text)}.conv-meta{font-size:11px;color:var(--text-muted);display:flex;gap:8px;margin-top:3px}.conv-delete-btn{position:absolute;right:8px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--text-muted);font-size:18px;cursor:pointer;opacity:0;transition:opacity .15s;line-height:1;padding:2px 4px;border-radius:4px}.conv-item:hover .conv-delete-btn{opacity:1}.conv-delete-btn:hover{color:var(--danger);background:#dc26261a}.sidebar-footer{padding:12px;border-top:1px solid var(--border)}.user-info{display:flex;align-items:center;gap:10px;margin-bottom:8px}.user-avatar{width:34px;height:34px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0}.user-details{overflow:hidden}.user-name{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-email{font-size:11px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sign-out-btn{width:100%;background:transparent;border:1px solid var(--border);color:var(--text-muted);padding:7px;border-radius:6px;cursor:pointer;font-size:13px;transition:all .15s}.sign-out-btn:hover{background:var(--input-bg);color:var(--text)}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}.chat-window{flex:1;display:flex;flex-direction:column;overflow:hidden}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--border);min-height:50px}.chat-header-left{display:flex;gap:8px}.agent-badge{font-size:14px;font-weight:500;color:var(--text-muted)}.clear-btn{background:transparent;border:1px solid var(--border);color:var(--text-muted);padding:5px 12px;border-radius:6px;cursor:pointer;font-size:13px;transition:all .15s}.clear-btn:hover{border-color:var(--accent);color:var(--text)}.clear-btn.danger{border-color:var(--danger);color:var(--danger)}.messages-container{flex:1;overflow-y:auto;padding:20px 16px;display:flex;flex-direction:column;gap:4px;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px;color:var(--text-muted);margin:auto}.empty-icon{font-size:48px;margin-bottom:16px}.empty-state h2{font-size:22px;color:var(--text);margin-bottom:8px}.empty-state p{font-size:15px}.message-row{display:flex;flex-direction:column;margin:4px 0}.message-row.user{align-items:flex-end}.message-row.assistant{align-items:flex-start}.agent-label{font-size:12px;font-weight:600;color:var(--accent);margin-bottom:4px;padding-left:4px}.message-bubble{max-width:min(720px,80%);padding:10px 14px;border-radius:14px;line-height:1.55;word-break:break-word}.user-bubble{background:var(--user-bubble);border:1px solid var(--border);border-bottom-right-radius:4px}.assistant-bubble{background:transparent;border-bottom-left-radius:4px}.message-text{white-space:pre-wrap}.message-markdown{font-size:15px}.message-markdown p{margin:0 0 8px}.message-markdown p:last-child{margin-bottom:0}.message-markdown h1,.message-markdown h2,.message-markdown h3{margin:12px 0 6px;color:var(--text)}.message-markdown ul,.message-markdown ol{padding-left:20px;margin:6px 0}.message-markdown li{margin:3px 0}.message-markdown blockquote{border-left:3px solid var(--accent);padding-left:12px;color:var(--text-muted);margin:8px 0}.message-markdown table{border-collapse:collapse;width:100%;margin:8px 0;font-size:13px}.message-markdown th,.message-markdown td{border:1px solid var(--border);padding:6px 10px;text-align:left}.message-markdown th{background:#ffffff0d}.inline-code{background:#ffffff1a;padding:1px 5px;border-radius:4px;font-family:SF Mono,Fira Code,monospace;font-size:.88em}.code-block{background:#1a1a1a;border:1px solid var(--border);border-radius:8px;padding:12px;overflow-x:auto;margin:8px 0;font-family:SF Mono,Fira Code,monospace;font-size:13px;line-height:1.5}.code-lang{font-size:11px;color:var(--text-muted);text-transform:uppercase;margin-bottom:6px;letter-spacing:.05em}.download-btn{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff;padding:5px 12px;border-radius:6px;text-decoration:none;font-size:13px;font-weight:500;transition:background .15s}.download-btn:hover{background:var(--accent-hover)}.cursor-blink{animation:blink .8s infinite;color:var(--accent)}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.typing-indicator{display:flex;gap:5px;padding:4px 0}.typing-indicator span{width:7px;height:7px;border-radius:50%;background:var(--text-muted);animation:bounce 1.2s infinite}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:scale(.8);opacity:.5}40%{transform:scale(1.1);opacity:1}}.input-area{padding:12px 16px 16px;background:var(--bg);border-top:1px solid var(--border);transition:border-color .15s}.input-area.dragging{border-color:var(--accent)}.file-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}.file-chip{display:flex;align-items:center;gap:6px;background:var(--input-bg);border:1px solid var(--border);border-radius:20px;padding:4px 10px;font-size:12px;max-width:200px}.file-chip-name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-chip-remove{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:16px;line-height:1;padding:0;flex-shrink:0}.file-chip-remove:hover{color:var(--danger)}.input-row{display:flex;align-items:flex-end;gap:8px;background:var(--input-bg);border:1px solid var(--border);border-radius:12px;padding:8px 8px 8px 12px;transition:border-color .15s}.input-row:focus-within{border-color:var(--accent)}.attach-btn{background:none;border:none;color:var(--text-muted);font-size:18px;cursor:pointer;padding:4px;border-radius:6px;flex-shrink:0;transition:color .15s}.attach-btn:hover{color:var(--text)}.attach-btn:disabled{opacity:.4;cursor:not-allowed}.message-textarea{flex:1;background:none;border:none;color:var(--text);font-size:15px;resize:none;outline:none;font-family:inherit;line-height:1.5;max-height:200px;overflow-y:auto;scrollbar-width:thin}.message-textarea::placeholder{color:var(--text-muted)}.send-btn{background:var(--accent);border:none;color:#fff;width:34px;height:34px;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}.send-btn:hover:not(:disabled){background:var(--accent-hover)}.send-btn:disabled{background:var(--border);cursor:not-allowed}.spinner-small{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg)}.login-card{background:var(--sidebar-bg);border:1px solid var(--border);border-radius:16px;padding:48px 40px;text-align:center;max-width:400px;width:90%}.login-logo{font-size:56px;margin-bottom:16px}.login-card h1{font-size:24px;margin-bottom:10px;color:var(--text)}.login-card p{color:var(--text-muted);font-size:14px;margin-bottom:28px;line-height:1.5}.login-btn{display:inline-flex;align-items:center;justify-content:center;background:var(--accent);color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:500;cursor:pointer;transition:background .15s;width:100%}.login-btn:hover{background:var(--accent-hover)}.login-btn.secondary{background:transparent;border:1px solid var(--border);color:var(--text)}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:16px;color:var(--text-muted)}.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);padding:10px 20px;border-radius:8px;font-size:14px;font-weight:500;z-index:1000;animation:fadeInUp .3s ease;pointer-events:none;white-space:nowrap}.toast-success{background:var(--success);color:#fff}.toast-error{background:var(--danger);color:#fff}.toast-info{background:var(--accent);color:#fff}@keyframes fadeInUp{0%{opacity:0;transform:translate(-50%) translateY(12px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.mobile-menu-btn{display:none;position:fixed;top:12px;left:12px;z-index:200;background:var(--sidebar-bg);border:1px solid var(--border);color:var(--text);font-size:18px;padding:6px 10px;border-radius:8px;cursor:pointer}@media (max-width: 768px){.mobile-menu-btn{display:block}.sidebar{position:fixed;height:100%;z-index:150;box-shadow:4px 0 20px #00000080}.sidebar.collapsed{transform:translate(-100%)}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:140}.chat-header{padding-left:52px}.message-bubble{max-width:90%}}