:root{--bg-primary:#fff;--bg-secondary:#f8f9fa;--bg-tertiary:#f1f3f5;--bg-input:#fff;--text-primary:#1a1a1a;--text-secondary:#6b7280;--text-muted:#9ca3af;--border-color:#e5e7eb;--accent-color:#10b981;--accent-light:#d1fae5;--accent-hover:#059669;--sidebar-width:260px;--header-height:56px;--content-max-width:720px;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--shadow-sm:0 1px 2px #0000000a;--shadow-md:0 4px 12px #0000000f;--shadow-lg:0 8px 24px #00000014}[data-theme=dark]{--bg-primary:#0f0f0f;--bg-secondary:#18181b;--bg-tertiary:#27272a;--bg-input:#1f1f23;--text-primary:#fafafa;--text-secondary:#a1a1aa;--text-muted:#71717a;--border-color:#27272a;--accent-color:#34d399;--accent-light:#064e3b;--accent-hover:#10b981;--shadow-sm:0 1px 2px #0003;--shadow-md:0 4px 12px #0000004d;--shadow-lg:0 8px 24px #0006}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{width:100%;height:100%;overflow:hidden}body{background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.6}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}[data-theme=dark] ::-webkit-scrollbar-thumb{background:var(--bg-tertiary)}[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.app-container{width:100vw;height:100vh;display:flex}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-primary);border-right:1px solid var(--border-color);flex-direction:column;height:100vh;display:flex;position:fixed;top:0;left:0;overflow:hidden}.sidebar-header{border-bottom:1px solid var(--border-color);flex-shrink:0;padding:12px}.new-chat-btn{border:1px solid var(--border-color);border-radius:var(--radius-md);width:100%;color:var(--text-primary);cursor:pointer;background:0 0;align-items:center;gap:8px;padding:10px 14px;font-size:14px;font-weight:500;transition:all .15s;display:flex}.new-chat-btn:hover{background:var(--bg-secondary)}.new-chat-btn svg{stroke:currentColor;stroke-width:2px;fill:none;width:16px;height:16px}.sidebar-content{flex:1;min-height:0;padding:8px;overflow-y:auto}.sidebar-section{margin-bottom:16px}.sidebar-section-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;padding:8px 12px 4px;font-size:11px;font-weight:600}.sidebar-item{border-radius:var(--radius-md);width:100%;color:var(--text-secondary);text-align:left;cursor:pointer;background:0 0;border:none;align-items:center;gap:10px;padding:10px 12px;font-size:14px;transition:all .15s;display:flex}.sidebar-item:hover,.sidebar-item.active{background:var(--bg-secondary);color:var(--text-primary)}.sidebar-item svg{stroke:currentColor;stroke-width:1.5px;fill:none;flex-shrink:0;width:16px;height:16px}.sidebar-item span{text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.sidebar-item-delete{border-radius:var(--radius-sm);width:20px;height:20px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;display:none}.sidebar-item:hover .sidebar-item-delete{display:flex}.sidebar-item-delete:hover{background:var(--bg-tertiary);color:var(--text-primary)}.sidebar-item-delete svg{stroke:currentColor;stroke-width:2px;fill:none;width:12px;height:12px}.sidebar-empty{text-align:center;color:var(--text-muted);padding:24px 16px;font-size:13px}.sidebar-footer{border-top:1px solid var(--border-color);flex-shrink:0;padding:12px}.sidebar-footer-item{border-radius:var(--radius-md);width:100%;color:var(--text-secondary);cursor:pointer;background:0 0;border:none;align-items:center;gap:10px;padding:10px 12px;font-size:13px;transition:all .15s;display:flex}.sidebar-footer-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.sidebar-footer-item svg{stroke:currentColor;stroke-width:1.5px;fill:none;width:16px;height:16px}.main-content{min-width:0;height:100vh;margin-left:var(--sidebar-width);flex-direction:column;flex:1;display:flex}.header{height:var(--header-height);background:var(--bg-primary);border-bottom:1px solid var(--border-color);flex-shrink:0;justify-content:space-between;align-items:center;padding:0 20px;display:flex}.header-left{align-items:center;gap:12px;display:flex}.menu-btn{border-radius:var(--radius-md);width:36px;height:36px;color:var(--text-primary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;display:none}.menu-btn:hover{background:var(--bg-secondary)}.menu-btn svg{stroke:currentColor;stroke-width:2px;fill:none;width:20px;height:20px}.header-title{color:var(--text-primary);font-size:17px;font-weight:600}.header-actions{align-items:center;gap:4px;display:flex}.header-btn{border-radius:var(--radius-md);width:36px;height:36px;color:var(--text-secondary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;transition:all .15s;display:flex}.header-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.header-btn svg{stroke:currentColor;stroke-width:1.5px;fill:none;width:18px;height:18px}.chat-container{max-width:var(--content-max-width);flex-direction:column;flex:1;width:100%;min-height:0;margin:0 auto;padding:0 20px;display:flex}.messages-area{flex-direction:column;flex:1;gap:20px;padding:24px 0;display:flex;overflow-y:auto}.empty-state{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;min-height:360px;padding:60px 20px;display:flex}.empty-icon{background:var(--accent-light);border-radius:var(--radius-lg);width:52px;height:52px;color:var(--accent-color);justify-content:center;align-items:center;margin-bottom:20px;display:flex}.empty-icon svg{fill:currentColor;width:26px;height:26px}.empty-state h2{color:var(--text-primary);margin-bottom:10px;font-size:22px;font-weight:600}.empty-state p{color:var(--text-secondary);max-width:300px;font-size:15px}.message{gap:14px;animation:.25s ease-out messageIn;display:flex}@keyframes messageIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.message.user{flex-direction:row-reverse}.message-avatar{background:var(--bg-secondary);border:1px solid var(--border-color);width:30px;height:30px;color:var(--text-secondary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;display:flex}.message.user .message-avatar{background:var(--accent-color);color:#fff;border:none}.message.assistant .message-avatar{background:linear-gradient(135deg, var(--accent-color), var(--accent-hover));color:#fff;border:none}.message-avatar svg{fill:currentColor;width:14px;height:14px}.message-content{flex:1;max-width:calc(100% - 52px)}.message.user .message-content{flex-direction:column;align-items:flex-end;display:flex}.message-bubble{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);color:var(--text-primary);padding:12px 16px;font-size:16px;line-height:1.7}.message.user .message-bubble{background:var(--accent-color);color:#fff;border:none}.message-bubble p{margin:0 0 8px}.message-bubble p:last-child{margin-bottom:0}.message-bubble h1{margin:12px 0 8px;font-size:18px;font-weight:600}.message-bubble h2{margin:10px 0 6px;font-size:16px;font-weight:600}.message-bubble h3{margin:8px 0 4px;font-size:15px;font-weight:600}.message-bubble h1:first-child,.message-bubble h2:first-child,.message-bubble h3:first-child{margin-top:0}.message-bubble ul,.message-bubble ol{margin:8px 0;padding-left:20px}.message-bubble li{margin:4px 0}.message-bubble code{background:#0000000f;border-radius:4px;padding:2px 6px;font-family:SF Mono,Fira Code,Monaco,monospace;font-size:13px}[data-theme=dark] .message-bubble code{background:#ffffff1a}.message-bubble pre{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);margin:8px 0;padding:12px;overflow-x:auto}.message-bubble pre code{background:0 0;padding:0;font-size:13px;line-height:1.5}.message-bubble blockquote{border-left:3px solid var(--border-color);color:var(--text-secondary);margin:8px 0;padding-left:12px}.message-bubble a{color:var(--accent-color)}.message-bubble strong{font-weight:600}.message-footer{opacity:0;justify-content:space-between;align-items:center;margin-top:6px;transition:opacity .15s;display:flex}.message:hover .message-footer{opacity:1}.message-time{color:var(--text-muted);padding:0 4px;font-size:11px}.message-actions{gap:4px;display:flex}.action-btn{border-radius:var(--radius-sm);width:26px;height:26px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;transition:all .15s;display:flex}.action-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.action-btn svg{stroke:currentColor;stroke-width:2px;fill:none;width:14px;height:14px}.typing-indicator{align-items:center;gap:14px;display:flex}.typing-dots{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);align-items:center;gap:4px;padding:10px 14px;display:flex}.typing-dots span{background:var(--text-muted);border-radius:50%;width:6px;height:6px;animation:1.4s ease-in-out infinite typing}.typing-dots span:first-child{animation-delay:-.32s}.typing-dots span:nth-child(2){animation-delay:-.16s}.typing-dots span:nth-child(3){animation-delay:0}@keyframes typing{0%,80%,to{opacity:.5;transform:scale(.8)}40%{opacity:1;transform:scale(1)}}.input-area{padding:12px 0 24px}.input-wrapper{background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);align-items:flex-end;gap:10px;padding:10px 12px 10px 16px;transition:all .2s;display:flex}.input-wrapper:focus-within{border-color:var(--accent-color);box-shadow:var(--shadow-lg), 0 0 0 3px var(--accent-light)}.input-wrapper textarea{color:var(--text-primary);resize:none;background:0 0;border:none;outline:none;flex:1;min-height:26px;max-height:140px;padding:0;font-family:inherit;font-size:16px;line-height:1.6}.input-wrapper textarea::placeholder{color:var(--text-muted)}.send-btn{background:var(--accent-color);border-radius:var(--radius-md);color:#fff;cursor:pointer;border:none;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;transition:all .15s;display:flex}.send-btn:hover:not(:disabled){background:var(--accent-hover);transform:scale(1.05)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.send-btn svg{stroke:currentColor;stroke-width:2px;fill:none;width:16px;height:16px}.input-hint{text-align:center;color:var(--text-muted);margin-top:10px;font-size:12px}.toast{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);box-shadow:var(--shadow-lg);z-index:100;padding:10px 20px;font-size:14px;animation:.25s ease-out toastIn;position:fixed;bottom:24px;left:50%;transform:translate(-50%)}@keyframes toastIn{0%{opacity:0;transform:translate(-50%)translateY(10px)}to{opacity:1;transform:translate(-50%)translateY(0)}}.sidebar-overlay{z-index:40;background:#00000080;display:none;position:fixed;inset:0}.sidebar-overlay.show{display:block}@media (width<=768px){.sidebar{z-index:50;transition:transform .3s;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0}.menu-btn{display:flex}.chat-container{padding:0 16px}.messages-area{gap:16px;padding:20px 0}.input-area{padding:10px 0 20px}.empty-state{min-height:280px;padding:40px 16px}}*{box-sizing:border-box}html,body,#root{width:100%;height:100%;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}#root{flex-direction:column;display:flex}@keyframes spin{to{transform:rotate(360deg)}}.auth-page{background:var(--bg-primary);background-image:radial-gradient(ellipse at 50% 0%, var(--accent-light) 0%, transparent 50%), radial-gradient(ellipse at 80% 80%, #10b9810f 0%, transparent 40%), radial-gradient(ellipse at 20% 90%, #10b9810a 0%, transparent 30%);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}[data-theme=dark] .auth-page{background-image:radial-gradient(at 50% 0,#34d39914 0%,#0000 50%),radial-gradient(at 80% 80%,#34d3990a 0%,#0000 40%),radial-gradient(at 20% 90%,#34d39908 0%,#0000 30%)}.auth-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:20px;width:100%;max-width:420px;padding:40px 36px;animation:.4s cubic-bezier(.16,1,.3,1) cardIn;box-shadow:0 4px 6px -1px #0000000d,0 10px 20px -2px #0000000f,0 0 0 1px #00000005}[data-theme=dark] .auth-card{box-shadow:0 4px 6px -1px #0003,0 10px 20px -2px #0000004d,0 0 0 1px #ffffff08}.auth-theme-toggle{cursor:pointer;background:0 0;border:none;border-radius:8px;padding:8px;font-size:20px;transition:background .2s;position:absolute;top:16px;right:16px}.auth-theme-toggle:after{content:"🌙"}[data-theme=light] .auth-theme-toggle:after{content:"☀️"}.auth-theme-toggle:hover{background:#0000000d}[data-theme=dark] .auth-theme-toggle:hover{background:#ffffff1a}@keyframes cardIn{0%{opacity:0;transform:translateY(12px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.auth-header{text-align:center;margin-bottom:32px}.auth-logo{color:#fff;background:linear-gradient(135deg,#059669,#10b981);border-radius:16px;justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto 20px;display:flex;box-shadow:0 4px 14px -2px #05966959}[data-theme=dark] .auth-logo{background:linear-gradient(135deg,#34d399,#10b981);box-shadow:0 4px 14px -2px #34d3994d}.auth-logo svg{fill:currentColor;width:28px;height:28px}.auth-header h1{color:var(--text-primary);letter-spacing:-.3px;margin:0 0 8px;font-size:24px;font-weight:600}.auth-header p{color:var(--text-secondary);margin:0;font-size:14px}.auth-form{flex-direction:column;gap:18px;display:flex}.auth-error{color:#dc2626;background:#fef2f2;border:1px solid #fecaca;border-radius:12px;align-items:center;gap:8px;padding:12px 16px;font-size:13px;display:flex}[data-theme=dark] .auth-error{color:#fca5a5;background:#dc26261a;border-color:#dc262640}.auth-error:before{content:"";background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23dc2626' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cline x1='12' y1='8' x2='12' y2='12'/%3E%3Cline x1='12' y1='16' x2='12.01' y2='16'/%3E%3C/svg%3E");background-size:contain;flex-shrink:0;width:16px;height:16px}[data-theme=dark] .auth-error:before{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fca5a5' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cline x1='12' y1='8' x2='12' y2='12'/%3E%3Cline x1='12' y1='16' x2='12.01' y2='16'/%3E%3C/svg%3E")}.form-group{flex-direction:column;gap:8px;display:flex}.form-group label{color:var(--text-primary);padding-left:4px;font-size:13px;font-weight:500}.input-wrapper-icon{align-items:center;display:flex;position:relative}.input-icon{width:18px;height:18px;color:var(--text-muted);pointer-events:none;z-index:1;transition:color .2s;position:absolute;left:14px}.input-icon svg{stroke:currentColor;stroke-width:1.5px;fill:none;width:100%;height:100%}.input-wrapper-icon input{padding-left:44px!important}.input-wrapper-icon:focus-within .input-icon{color:var(--accent-color)}.form-group input{background:var(--bg-input);border:1.5px solid var(--border-color);color:var(--text-primary);border-radius:12px;width:100%;padding:13px 16px;font-size:15px;transition:border-color .2s,box-shadow .2s,background-color .2s}.form-group input::placeholder{color:var(--text-muted);font-size:14px}.form-group input:hover{border-color:var(--text-muted)}.form-group input:focus{border-color:var(--accent-color);background:var(--bg-secondary);box-shadow:0 0 0 4px var(--accent-light), 0 0 0 1px var(--accent-color);outline:none}[data-theme=dark] .form-group input:focus{box-shadow:0 0 0 4px #34d3991f, 0 0 0 1px var(--accent-color)}.auth-btn{color:#fff;cursor:pointer;letter-spacing:.2px;border:none;border-radius:12px;margin-top:8px;padding:14px 24px;font-size:15px;font-weight:600;transition:transform .15s cubic-bezier(.34,1.56,.64,1),box-shadow .15s,opacity .15s;position:relative;overflow:hidden;background:linear-gradient(135deg,#10b981,#059669)!important}.auth-btn:after{content:"";opacity:0;background:linear-gradient(135deg,#fff3 0%,#0000 50% 100%);transition:opacity .2s;position:absolute;inset:0}.auth-btn:hover:not(:disabled){transform:translateY(-2px)scale(1.02);box-shadow:0 8px 20px -4px #05966980}[data-theme=dark] .auth-btn{background:linear-gradient(135deg,#34d399,#10b981)}[data-theme=dark] .auth-btn:hover:not(:disabled){box-shadow:0 8px 20px -4px #34d39966}.auth-btn:hover:not(:disabled):after{opacity:1}.auth-btn:active:not(:disabled){transform:translateY(0)scale(.98);box-shadow:0 2px 8px -2px #00000026}.auth-btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.auth-btn .btn-spinner{vertical-align:middle;border:2px solid #ffffff4d;border-top-color:#fff;border-radius:50%;width:16px;height:16px;margin-right:8px;animation:.7s linear infinite spin;display:inline-block}.auth-footer{text-align:center;color:var(--text-secondary);border-top:1px solid var(--border-color);margin-top:28px;padding-top:20px;font-size:14px}.auth-footer a{color:var(--accent-color);font-weight:600;text-decoration:none;transition:color .15s}.auth-footer a:hover{color:var(--accent-hover);text-decoration:underline}.loading-screen{background:var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;display:flex}@media (width<=480px){.auth-card{border-radius:16px;max-width:100%;padding:32px 24px}.auth-header h1{font-size:22px}.auth-logo{border-radius:14px;width:52px;height:52px}.auth-logo svg{width:26px;height:26px}.form-group input{padding:12px 14px;font-size:16px}.auth-btn{padding:13px 20px;font-size:15px}}@media (width>=768px){.auth-card{padding:44px 40px}}.loading-screen{background:var(--bg-primary);justify-content:center;align-items:center;height:100vh;display:flex}.loading-spinner{border:3px solid var(--border-color);border-top-color:var(--accent-color);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}.sidebar-loading{text-align:center;color:var(--text-muted);padding:24px 16px;font-size:14px}.sidebar-user{justify-content:space-between;align-items:center;padding:8px 12px;display:flex}.user-email{color:var(--text-secondary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:13px;overflow:hidden}.logout-btn{border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;background:0 0;padding:6px 12px;font-size:12px;transition:all .15s}.logout-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.header-right{align-items:center;gap:4px;display:flex}.theme-toggle-btn{border-radius:var(--radius-md);width:36px;height:36px;color:var(--text-secondary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;font-size:18px;transition:background .15s;display:flex}.theme-toggle-btn:hover{background:var(--bg-secondary)}