*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--c-primary: #2563eb;--c-primary-hover: #1d4ed8;--c-bg: #f9fafb;--c-surface: #ffffff;--c-sidebar: #1e293b;--c-sidebar-hover: #334155;--c-sidebar-active: #3b82f6;--c-text: #111827;--c-text-secondary: #6b7280;--c-border: #e5e7eb;--c-user-bubble: #2563eb;--c-user-text: #ffffff;--c-assistant-bg: #f3f4f6;--c-error: #ef4444;--radius: 8px;--radius-lg: 12px;--shadow: 0 1px 3px rgba(0, 0, 0, .1);--sidebar-w: 280px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif}html,body,#root{height:100%}body{font-family:var(--font);color:var(--c-text);background:var(--c-bg);-webkit-font-smoothing:antialiased}.auth-page{display:flex;align-items:center;justify-content:center;min-height:100%;padding:24px;background:linear-gradient(135deg,#eff6ff,#f9fafb)}.auth-card{width:100%;max-width:400px;background:var(--c-surface);border-radius:var(--radius-lg);box-shadow:0 4px 24px #00000014;padding:40px 32px}.auth-card h1{font-size:24px;font-weight:700;text-align:center;color:var(--c-primary)}.auth-subtitle{text-align:center;color:var(--c-text-secondary);font-size:14px;margin-top:4px;margin-bottom:24px}.auth-tabs{display:flex;border-radius:var(--radius);border:1px solid var(--c-border);overflow:hidden;margin-bottom:24px}.auth-tab{flex:1;padding:10px;border:none;background:transparent;font-size:14px;font-weight:500;cursor:pointer;transition:background .15s,color .15s;color:var(--c-text-secondary)}.auth-tab.active{background:var(--c-primary);color:#fff}.auth-card label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--c-text)}.auth-card input{width:100%;padding:10px 12px;border:1px solid var(--c-border);border-radius:var(--radius);font-size:14px;font-family:var(--font);margin-bottom:16px;outline:none;transition:border-color .15s}.auth-card input:focus{border-color:var(--c-primary);box-shadow:0 0 0 3px #2563eb1a}.auth-error{color:var(--c-error);font-size:13px;margin-bottom:12px}.auth-submit{width:100%;padding:11px;border:none;border-radius:var(--radius);background:var(--c-primary);color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s}.auth-submit:hover:not(:disabled){background:var(--c-primary-hover)}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.chat-layout{display:flex;height:100%}.sidebar{width:var(--sidebar-w);background:var(--c-sidebar);display:flex;flex-direction:column;flex-shrink:0}.sidebar-overlay{display:none}.sidebar-header{padding:16px;border-bottom:1px solid rgba(255,255,255,.08)}.new-chat-btn{width:100%;padding:10px;border:1px solid rgba(255,255,255,.2);border-radius:var(--radius);background:transparent;color:#fff;font-size:14px;font-weight:500;cursor:pointer;transition:background .15s}.new-chat-btn:hover{background:var(--c-sidebar-hover)}.sidebar-list{flex:1;overflow-y:auto;padding:8px}.sidebar-empty{color:#fff6;font-size:13px;text-align:center;padding:24px 8px}.sidebar-item{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-radius:var(--radius);color:#fffc;font-size:14px;cursor:pointer;transition:background .15s;margin-bottom:2px}.sidebar-item:hover{background:var(--c-sidebar-hover)}.sidebar-item.active{background:var(--c-sidebar-active);color:#fff}.sidebar-item-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}.sidebar-edit-input{flex:1;min-width:0;padding:2px 6px;border:1px solid rgba(255,255,255,.4);border-radius:4px;background:#ffffff1a;color:#fff;font-size:13px;font-family:var(--font);outline:none}.sidebar-edit-input:focus{border-color:#fff}.sidebar-item-del{background:none;border:none;color:#fff6;font-size:18px;cursor:pointer;padding:0 4px;line-height:1;opacity:0;transition:opacity .15s,color .15s}.sidebar-item:hover .sidebar-item-del{opacity:1}.sidebar-item-del:hover{color:#fff}.sidebar-footer{padding:12px 16px;border-top:1px solid rgba(255,255,255,.08);display:flex;align-items:center;justify-content:space-between}.sidebar-user{color:#fff9;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.logout-btn{background:none;border:1px solid rgba(255,255,255,.2);color:#ffffffb3;padding:4px 10px;border-radius:var(--radius);font-size:12px;cursor:pointer;transition:background .15s,color .15s;flex-shrink:0}.logout-btn:hover{background:#ffffff1a;color:#fff}.main-panel{flex:1;display:flex;flex-direction:column;min-width:0}.main-header{display:flex;align-items:center;padding:12px 20px;border-bottom:1px solid var(--c-border);background:var(--c-surface);gap:12px}.menu-btn{display:none;background:none;border:none;font-size:20px;cursor:pointer;color:var(--c-text);padding:4px}.main-title{font-size:15px;font-weight:600;color:var(--c-text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.messages{flex:1;overflow-y:auto;padding:24px 0}.messages-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;padding:48px 24px;color:var(--c-text-secondary)}.messages-empty h2{font-size:24px;font-weight:700;color:var(--c-text);margin-bottom:8px}.messages-empty p{font-size:15px;max-width:360px}.message{display:flex;gap:12px;padding:12px 24px;max-width:800px;margin:0 auto}.message-user{flex-direction:row-reverse}.message-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}.message-user .message-avatar{background:var(--c-user-bubble);color:var(--c-user-text)}.message-assistant .message-avatar{background:var(--c-assistant-bg);color:var(--c-text);border:1px solid var(--c-border)}.message-content{font-size:15px;line-height:1.6;word-break:break-word;max-width:85%}.message-content p{margin-bottom:8px}.message-content p:last-child{margin-bottom:0}.message-content ul,.message-content ol{padding-left:20px;margin-bottom:8px}.message-content li{margin-bottom:4px}.message-content code{background:#0000000f;border-radius:4px;padding:2px 6px;font-size:13px;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace}.message-content pre{background:#0000000f;border-radius:8px;padding:12px 16px;overflow-x:auto;margin-bottom:8px}.message-content pre code{background:none;padding:0;border-radius:0}.message-user .message-content code{background:#ffffff26}.message-user .message-content pre{background:#ffffff1a}.message-user .message-content{background:var(--c-user-bubble);color:var(--c-user-text);padding:10px 16px;border-radius:16px 16px 4px}.message-assistant .message-content{background:var(--c-assistant-bg);padding:10px 16px;border-radius:16px 16px 16px 4px}.message-content.thinking{color:var(--c-text-secondary);font-style:italic}.message-error{text-align:center;padding:16px 24px;color:var(--c-error);font-size:14px}.spinner{width:24px;height:24px;border:3px solid var(--c-border);border-top-color:var(--c-primary);border-radius:50%;animation:spin .7s linear infinite;margin:0 auto 12px}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{color:var(--c-text-secondary);font-size:14px}.chat-input{display:flex;gap:8px;padding:16px 24px;border-top:1px solid var(--c-border);background:var(--c-surface);max-width:800px;margin:0 auto;width:100%}.chat-input textarea{flex:1;padding:10px 14px;border:1px solid var(--c-border);border-radius:var(--radius-lg);font-size:14px;font-family:var(--font);resize:none;outline:none;line-height:1.5;min-height:44px;max-height:120px;transition:border-color .15s}.chat-input textarea:focus{border-color:var(--c-primary);box-shadow:0 0 0 3px #2563eb1a}.chat-input button{padding:10px 20px;border:none;border-radius:var(--radius-lg);background:var(--c-primary);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s;white-space:nowrap}.chat-input button:hover:not(:disabled){background:var(--c-primary-hover)}.chat-input button:disabled{opacity:.5;cursor:not-allowed}@media(max-width:768px){.sidebar{position:fixed;top:0;left:0;bottom:0;z-index:100;transform:translate(-100%);transition:transform .2s ease}.sidebar.open{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:99}.menu-btn{display:inline-flex}.message{padding:10px 16px}.chat-input{padding:12px 16px}.auth-card{padding:28px 20px}}