:root{--bg-primary:#0b0c10;--bg-secondary:#13151c;--bg-tertiary:#1a1d27;--bg-input:#1a1d27;--text-primary:#fff;--text-secondary:#94a3b8;--text-muted:#64748b;--border-color:#272a37;--accent-primary:#6366f1;--accent-hover:#4f46e5;--accent-gradient:linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);--danger:#ef4444;--success:#10b981;--warning:#f59e0b;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--sidebar-width:280px;--font-family:"Inter", system-ui, -apple-system, sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;font-family:var(--font-family);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased}a{color:var(--accent-primary);text-decoration:none}a:hover{color:var(--accent-hover)}button{cursor:pointer;font-family:var(--font-family);border:none;outline:none}input,textarea,select{font-family:var(--font-family);outline:none}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.login-shell{background:var(--bg-primary);justify-content:center;align-items:center;height:100%;display:flex}.login-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);width:100%;max-width:400px;padding:40px;position:relative}.login-glow{border-radius:var(--radius-lg);background:var(--accent-gradient);opacity:.15;z-index:-1;filter:blur(12px);position:absolute;inset:-1px}.login-title{text-align:center;background:var(--accent-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:8px;font-size:24px;font-weight:700}.login-subtitle{text-align:center;color:var(--text-secondary);margin-bottom:32px;font-size:14px}.login-form{flex-direction:column;gap:20px;display:flex}.field{flex-direction:column;gap:6px;display:flex}.field label{color:var(--text-secondary);font-size:13px;font-weight:500}.field input{background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);padding:10px 14px;font-size:14px;transition:border-color .2s}.field input:focus{border-color:var(--accent-primary)}.login-error{color:var(--danger);border-radius:var(--radius-sm);background:#ef44441a;padding:8px 12px;font-size:13px}.login-btn{background:var(--accent-gradient);color:#fff;border-radius:var(--radius-sm);padding:12px;font-size:15px;font-weight:600;transition:opacity .2s}.login-btn:hover:not(:disabled){opacity:.9}.login-btn:disabled{opacity:.5;cursor:not-allowed}.chat-layout{height:100%;display:flex}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border-color);flex-direction:column;height:100%;display:flex}.new-chat-btn{background:var(--accent-gradient);color:#fff;border-radius:var(--radius-sm);margin:12px;padding:10px;font-size:14px;font-weight:600;transition:opacity .2s}.new-chat-btn:hover{opacity:.9}.conversation-list{flex:1;padding:0 8px;overflow-y:auto}.conv-item{border-radius:var(--radius-sm);cursor:pointer;align-items:center;margin-bottom:2px;padding:10px 12px;transition:background .15s;display:flex;position:relative}.conv-item:hover,.conv-item.active{background:var(--bg-tertiary)}.conv-title{color:var(--text-secondary);text-overflow:ellipsis;white-space:nowrap;flex:1;padding-right:52px;font-size:13px;overflow:hidden}.conv-item.active .conv-title{color:var(--text-primary)}.conv-actions{gap:4px;display:none;position:absolute;top:50%;right:8px;transform:translateY(-50%)}.conv-item:hover .conv-actions{display:flex}.conv-action-btn{width:26px;height:26px;color:var(--text-muted);background:0 0;border-radius:4px;justify-content:center;align-items:center;font-size:12px;transition:color .15s,background .15s;display:flex}.conv-action-btn:hover{color:var(--text-primary);background:var(--border-color)}.conv-delete-btn:hover{color:var(--danger)}.conv-rename-input{background:var(--bg-input);border:1px solid var(--accent-primary);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);padding:4px 8px;font-size:13px}.conv-empty{text-align:center;color:var(--text-muted);padding:20px 12px;font-size:13px}.sidebar-footer{border-top:1px solid var(--border-color);padding:12px}.sidebar-user{align-items:center;gap:8px;margin-top:12px;display:flex}.user-avatar{background:var(--accent-gradient);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:30px;height:30px;font-size:13px;font-weight:600;display:flex}.user-name{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:13px;overflow:hidden}.logout-btn{width:28px;height:28px;color:var(--text-muted);background:0 0;border-radius:4px;justify-content:center;align-items:center;font-size:16px;transition:color .15s;display:flex}.logout-btn:hover{color:var(--danger)}.budget-indicator{margin-bottom:4px}.budget-text{color:var(--text-muted);justify-content:space-between;margin-bottom:4px;font-size:11px;display:flex}.budget-track{background:var(--bg-tertiary);border-radius:2px;height:4px;overflow:hidden}.budget-fill{border-radius:2px;height:100%;transition:width .3s}.chat-main{flex-direction:column;flex:1;min-width:0;height:100%;display:flex}.chat-header{border-bottom:1px solid var(--border-color);background:var(--bg-secondary);justify-content:space-between;align-items:center;padding:12px 20px;display:flex}.chat-title{white-space:nowrap;text-overflow:ellipsis;max-width:400px;font-size:16px;font-weight:600;overflow:hidden}.chat-header-right .model-selector{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);padding:6px 10px;font-size:13px}.message-list{flex:1;padding:20px;overflow-y:auto}.empty-chat{height:100%;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;display:flex}.empty-chat-icon{opacity:.3;margin-bottom:12px;font-size:40px}.empty-chat h3{color:var(--text-secondary);margin-bottom:6px;font-size:18px}.empty-chat p{font-size:14px}.message-row{margin-bottom:20px;display:flex}.user-row{justify-content:flex-end}.assistant-row{justify-content:flex-start}.message-bubble{border-radius:var(--radius-md);max-width:75%;padding:12px 16px;font-size:14px;line-height:1.6}.user-bubble{background:var(--accent-gradient);color:#fff;border-bottom-right-radius:4px;position:relative}.edit-msg-btn{width:24px;height:24px;color:var(--text-muted);opacity:0;background:0 0;border-radius:4px;justify-content:center;align-items:center;font-size:12px;transition:opacity .15s,color .15s;display:flex;position:absolute;top:4px;left:-32px}.user-bubble:hover .edit-msg-btn{opacity:1}.edit-msg-btn:hover{color:var(--text-primary);background:var(--border-color)}.assistant-bubble{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color);border-bottom-left-radius:4px}.assistant-bubble.streaming{border-color:var(--accent-primary)}.error-bubble{color:var(--danger);background:#ef44441a;border:1px solid #ef44444d}.message-bubble p{margin:0}.message-bubble p+p{margin-top:8px}.message-bubble pre{background:var(--bg-primary);border-radius:var(--radius-sm);margin:8px 0;padding:12px;font-size:13px;line-height:1.5;overflow-x:auto}.message-bubble code{font-family:SF Mono,Fira Code,Consolas,monospace;font-size:13px}.message-bubble :not(pre)>code{background:var(--bg-primary);border-radius:4px;padding:2px 6px}.message-bubble ul,.message-bubble ol{padding-left:20px}.message-bubble table{border-collapse:collapse;width:100%;margin:8px 0}.message-bubble th,.message-bubble td{border:1px solid var(--border-color);text-align:left;padding:6px 10px}.message-bubble th{background:var(--bg-primary);font-weight:600}.message-bubble blockquote{border-left:3px solid var(--accent-primary);color:var(--text-secondary);margin:8px 0;padding-left:12px}.typing-indicator{gap:4px;padding:4px 0;display:flex}.typing-indicator span{background:var(--text-muted);border-radius:50%;width:6px;height:6px;animation:1.4s ease-in-out infinite typing}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,80%,to{opacity:.3;transform:scale(.8)}40%{opacity:1;transform:scale(1)}}.chat-input-bar{border-top:1px solid var(--border-color);background:var(--bg-secondary);align-items:flex-end;gap:8px;padding:16px 20px;display:flex}.chat-input{background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);resize:none;flex:1;max-height:180px;padding:10px 14px;font-size:14px;line-height:1.5;transition:border-color .2s}.chat-input:focus{border-color:var(--accent-primary)}.chat-input:disabled{opacity:.5;cursor:not-allowed}.chat-input::placeholder{color:var(--text-muted)}.send-btn{background:var(--accent-gradient);color:#fff;border-radius:var(--radius-sm);flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;font-size:18px;font-weight:700;transition:opacity .2s;display:flex}.send-btn:hover:not(:disabled){opacity:.9}.send-btn:disabled{opacity:.4;cursor:not-allowed}.stop-btn{background:var(--danger)}.thinking-section{border:1px solid var(--border-color);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden}.thinking-summary{color:var(--text-muted);cursor:pointer;-webkit-user-select:none;user-select:none;background:var(--bg-primary);padding:8px 12px;font-size:12px;font-weight:500;transition:color .15s}.thinking-summary:hover{color:var(--text-secondary)}.thinking-content{color:var(--text-muted);white-space:pre-wrap;border-top:1px solid var(--border-color);padding:8px 12px 12px;font-size:12px;line-height:1.5}.edit-bubble{flex-direction:column;gap:8px;max-width:75%;display:flex}.edit-textarea{background:var(--bg-input);border:1px solid var(--accent-primary);border-radius:var(--radius-md);color:var(--text-primary);font-size:14px;line-height:1.5;font-family:var(--font-family);resize:none;outline:none;max-height:180px;padding:10px 14px}.edit-actions{justify-content:flex-end;gap:8px;display:flex}.edit-save-btn{background:var(--accent-gradient);color:#fff;border-radius:var(--radius-sm);padding:6px 14px;font-size:12px;font-weight:600;transition:opacity .2s}.edit-save-btn:hover{opacity:.9}.edit-cancel-btn{color:var(--text-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);background:0 0;padding:6px 14px;font-size:12px;transition:color .15s,border-color .15s}.edit-cancel-btn:hover{color:var(--text-primary);border-color:var(--text-muted)}@media (width<=768px){.sidebar{z-index:10;width:100%;min-width:100%;transition:transform .3s;position:absolute;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.message-bubble{max-width:90%}}