.auth-page{min-height:100vh;background:linear-gradient(135deg,#0f0f23 0%,#1a1a2e 50%,#16213e 100%);display:flex;align-items:center;justify-content:center;padding:2rem;position:relative;overflow:hidden;width:100%}.auth-background{position:absolute;top:0;left:0;right:0;bottom:0;z-index:0}.auth-particles{position:absolute;top:0;left:0;right:0;bottom:0;background-image:radial-gradient(circle at 20% 80%,rgba(102,126,234,.1) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(118,75,162,.1) 0%,transparent 50%),radial-gradient(circle at 40% 40%,rgba(102,126,234,.05) 0%,transparent 50%);animation:float 20s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-20px) rotate(180deg)}}.auth-container{width:100%;max-width:450px;z-index:1;position:relative;display:flex;align-items:center;justify-content:center}.auth-card{background:rgba(255,255,255,.05);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.1);border-radius:24px;padding:3rem 2.5rem;box-shadow:0 25px 50px #0000004d;position:relative;overflow:hidden;width:100%;max-width:450px}.auth-card:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.1),transparent);transition:left .5s ease}.auth-card:hover:before{left:100%}.auth-header{text-align:center;margin-bottom:2.5rem}.auth-logo{display:flex;align-items:center;justify-content:center;gap:.75rem;margin-bottom:1.5rem}.logo-icon{background:transparent;border-radius:12px;padding:.5rem;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:none}.logo-icon img{width:40px;height:40px;border-radius:8px;object-fit:cover;background:transparent}.logo-text{font-size:2rem;font-weight:800;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0;text-shadow:0 0 30px rgba(102,126,234,.3);letter-spacing:-.5px}.auth-header h2{font-size:1.75rem;font-weight:700;color:#fff;margin:0 0 .5rem}.auth-header p{color:#b0b0b0;font-size:1rem;margin:0;line-height:1.5}.auth-form{margin-bottom:2rem}.form-group label{display:block;font-weight:600;color:#fff;margin-bottom:.5rem;font-size:.9rem}.form-group input{width:100%;background:rgba(255,255,255,.08);border:2px solid rgba(255,255,255,.1);border-radius:12px;padding:1rem 1.25rem;color:#fff;font-size:1rem;transition:all .3s ease;box-sizing:border-box}.form-group input::placeholder{color:#888}.form-group input:focus{outline:none;border-color:#667eea;background:rgba(255,255,255,.12);box-shadow:0 0 0 4px #667eea1a}.form-group input.error{border-color:#ff6b6b;background:rgba(255,107,107,.1)}.password-input-container{position:relative}.password-toggle{position:absolute;right:1rem;top:50%;transform:translateY(-50%);background:none;border:none;color:#888;cursor:pointer;padding:.25rem;border-radius:4px;transition:all .3s ease}.password-toggle:hover{color:#667eea;background:rgba(102,126,234,.1)}.password-toggle:disabled{opacity:.5;cursor:not-allowed}.error-message{color:#ff6b6b;font-size:.85rem;margin-top:.5rem;display:flex;align-items:center;gap:.5rem}.error-message:before{content:"⚠️";font-size:.75rem}.submit-error{background:rgba(255,107,107,.1);border:1px solid rgba(255,107,107,.3);border-radius:8px;padding:.75rem;margin-bottom:1rem}.auth-button{width:100%;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:12px;padding:1rem;color:#fff;font-weight:600;font-size:1rem;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:.5rem;box-shadow:0 8px 24px #667eea4d;position:relative;overflow:hidden;text-decoration:none}.auth-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s ease}.auth-button:hover:before{left:100%}.auth-button:hover{transform:translateY(-2px);box-shadow:0 12px 32px #667eea66}.auth-button:disabled{opacity:.7;cursor:not-allowed;transform:none}.auth-button:disabled:hover{transform:none;box-shadow:0 8px 24px #667eea4d}.auth-button.secondary{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);box-shadow:0 4px 16px #0003}.auth-button.secondary:hover{background:rgba(255,255,255,.15);border-color:#667eea4d;box-shadow:0 8px 24px #0000004d}.auth-links{text-align:center;margin-top:1rem}.forgot-password-link{color:#667eea;text-decoration:none;font-size:.9rem;transition:all .3s ease}.forgot-password-link:hover{color:#5a6fd8;text-decoration:underline}.auth-footer{text-align:center;margin-bottom:2rem}.auth-footer p{color:#b0b0b0;font-size:.9rem;margin:0}.auth-link{color:#667eea;text-decoration:none;font-weight:600;transition:all .3s ease}.auth-link:hover{color:#5a6fd8;text-decoration:underline}.auth-features{margin-top:2rem;padding-top:2rem;border-top:1px solid rgba(255,255,255,.1)}.auth-features h3{color:#fff;font-size:1.1rem;font-weight:600;margin-bottom:1rem;text-align:center}.features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.feature-item{display:flex;align-items:center;gap:.5rem;color:#b0b0b0;font-size:.85rem}.feature-icon{font-size:1.2rem;filter:drop-shadow(0 0 8px rgba(102,126,234,.5))}.password-requirements{margin-top:.75rem;padding:.75rem;background:rgba(255,255,255,.05);border-radius:8px;border:1px solid rgba(255,255,255,.1)}.password-requirements small{color:#888;font-size:.8rem;display:block;margin-bottom:.5rem}.password-requirements ul{list-style:none;padding:0;margin:0}.password-requirements li{color:#b0b0b0;font-size:.8rem;margin-bottom:.25rem;padding-left:1.25rem;position:relative}.password-requirements li:before{content:"○";position:absolute;left:0;color:#666}.password-requirements li.valid{color:#10b981}.password-requirements li.valid:before{content:"●";color:#10b981}.auth-terms{text-align:center;margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid rgba(255,255,255,.1)}.auth-terms p{color:#888;font-size:.8rem;margin:0;line-height:1.5}.auth-terms a{color:#667eea;text-decoration:none;transition:all .3s ease}.auth-terms a:hover{color:#5a6fd8;text-decoration:underline}.success-content,.error-content{text-align:center;margin-bottom:2rem}.success-icon,.error-icon{margin-bottom:1.5rem;display:flex;justify-content:center}.success-icon svg{color:#10b981;filter:drop-shadow(0 0 16px rgba(16,185,129,.5))}.error-icon svg{color:#ff6b6b;filter:drop-shadow(0 0 16px rgba(255,107,107,.5))}.success-message h3,.error-message h3{color:#fff;font-size:1.3rem;font-weight:600;margin-bottom:1rem}.success-message p,.error-message p{color:#b0b0b0;font-size:.95rem;line-height:1.6;margin-bottom:1rem}.success-message strong{color:#667eea;font-weight:600}.email-instructions{margin:1.5rem 0;padding:1rem;background:rgba(255,255,255,.05);border-radius:12px;border:1px solid rgba(255,255,255,.1)}.email-instructions h4{color:#fff;font-size:1rem;font-weight:600;margin-bottom:.75rem}.email-instructions ul{list-style:none;padding:0;margin:0;text-align:left}.email-instructions li{color:#b0b0b0;font-size:.9rem;margin-bottom:.5rem;padding-left:1.5rem;position:relative}.email-instructions li:before{content:"•";position:absolute;left:0;color:#667eea;font-weight:700}.auth-actions{display:flex;flex-direction:column;gap:1rem;align-items:center;margin-top:2rem}.auth-actions .auth-button{width:auto;min-width:200px}@media (max-width: 768px){.auth-page{padding:1rem}.auth-card{padding:2rem 1.5rem}.logo-text{font-size:1.75rem}.auth-header h2{font-size:1.5rem}.features-grid{grid-template-columns:1fr;gap:.75rem}.feature-item{font-size:.8rem}.auth-actions{gap:.75rem}.auth-actions .auth-button{min-width:180px}}@media (max-width: 480px){.auth-card{padding:1.5rem 1rem}.logo-text{font-size:1.5rem}.auth-header h2{font-size:1.25rem}.form-group input{padding:.875rem 1rem}.auth-button{padding:.875rem}.auth-actions .auth-button{min-width:160px}}.header{position:fixed;top:0;left:0;right:0;height:64px;background:var(--bg-gradient-secondary);border-bottom:1px solid var(--border-primary);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:var(--z-fixed);display:flex;align-items:center;justify-content:space-between;padding:0 var(--spacing-xl);box-sizing:border-box}.header-left{display:flex;align-items:center;gap:var(--spacing-lg)}.sidebar-toggle{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:var(--spacing-sm);border-radius:var(--radius-sm);transition:all .3s ease;display:flex;align-items:center;justify-content:center;width:40px;height:40px}.sidebar-toggle:hover{background:var(--surface-primary);color:var(--text-primary);transform:scale(1.05)}.sidebar-toggle svg{transition:transform .3s ease}.sidebar-toggle.open svg{transform:rotate(90deg)}.logo{display:flex;align-items:center}.logo-icon{display:flex;align-items:center;justify-content:center}.logo-icon img{border-radius:var(--radius-sm);box-shadow:0 4px 16px var(--shadow-primary)}.header-right{display:flex;align-items:center;gap:var(--spacing-md)}.user-profile{position:relative;display:flex;align-items:center;justify-content:center}.avatar-button{background:none;border:none;cursor:pointer;padding:var(--spacing-xs);border-radius:50%;transition:all .3s ease;display:flex;align-items:center;justify-content:center}.avatar-button:hover{background:var(--surface-primary);transform:scale(1.05)}.avatar{width:40px;height:40px;border-radius:50%;object-fit:cover;border:2px solid var(--border-secondary);transition:all .3s ease}.avatar-button:hover .avatar{border-color:var(--primary-color);box-shadow:0 0 0 2px #667eea33}.avatar-initial{width:40px;height:40px;border-radius:50%;background:var(--primary-gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px;border:2px solid var(--border-secondary);transition:all .3s ease;text-transform:uppercase;letter-spacing:.5px;box-shadow:0 4px 16px var(--shadow-secondary);text-shadow:0 2px 4px rgba(0,0,0,.5);font-family:inherit;line-height:1}.avatar-button:hover .avatar-initial{border-color:var(--primary-color);box-shadow:0 0 0 2px #667eea33,0 6px 20px var(--shadow-primary);transform:scale(1.05)}.dropdown-menu{position:absolute;top:calc(100% + var(--spacing-sm));right:0;background:var(--surface-overlay);border:1px solid var(--border-primary);border-radius:var(--radius-md);box-shadow:0 8px 32px var(--shadow-overlay);min-width:240px;max-width:300px;max-height:400px;z-index:1010;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);animation:slideInDown .2s ease;overflow-y:auto;overflow-x:hidden;margin-right:var(--spacing-md);bottom:auto}.dropdown-menu.dropdown-top{top:auto;bottom:calc(100% + var(--spacing-sm));animation:slideInUp .2s ease}@keyframes slideInUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.dropdown-header{padding:var(--spacing-md);border-bottom:1px solid var(--border-secondary);background:var(--surface-tertiary);display:flex;flex-direction:column;align-items:flex-start;gap:var(--spacing-xs)}.username{font-weight:600;color:var(--text-primary);margin:0;font-size:14px;line-height:1.3;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;width:100%;text-align:left}.email{font-size:12px;color:var(--text-tertiary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.3;margin:0;width:100%;text-align:left}.dropdown-divider{height:1px;background:var(--border-secondary);margin:var(--spacing-xs) 0}.dropdown-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);color:var(--text-secondary);text-decoration:none;transition:all .2s ease;border:none;background:none;width:100%;text-align:left;cursor:pointer;font-size:14px;font-family:inherit;font-weight:500;border-radius:var(--radius-sm);margin:2px 4px;position:relative;overflow:hidden}.dropdown-item:hover{background:var(--surface-primary);color:var(--text-primary);transform:translate(2px);box-shadow:0 2px 8px #0000001a}.dropdown-item:hover svg{transform:scale(1.1);color:var(--primary-color)}.dropdown-item:active{transform:translate(1px) scale(.98);transition:all .1s ease}.dropdown-item.logout{color:var(--status-error);font-weight:600;border:1px solid transparent;margin-top:var(--spacing-xs)}.dropdown-item.logout:hover{background:rgba(239,68,68,.1);color:var(--status-error);border-color:#ef44444d;transform:translate(4px)}.dropdown-item svg{color:var(--text-tertiary);transition:color .2s ease;flex-shrink:0;width:16px;height:16px}.dropdown-item:hover svg{color:var(--primary-color)}.dropdown-item.logout svg{color:var(--status-error)}@media (max-width: 768px){.header{padding:0 var(--spacing-md)}.header-left{gap:var(--spacing-md)}.logo-icon img{width:40px;height:40px}.avatar,.avatar-initial{width:36px;height:36px}.avatar-initial{font-size:14px}.dropdown-menu{min-width:200px;max-width:260px;right:var(--spacing-sm);margin-right:0;transform:translate(0);left:auto}.username{font-size:13px}.email{font-size:11px}}@media (max-width: 480px){.header{padding:0 var(--spacing-sm)}.header-left{gap:var(--spacing-sm)}.logo-icon img{width:36px;height:36px}.avatar,.avatar-initial{width:32px;height:32px}.avatar-initial{font-size:12px}.dropdown-menu{min-width:calc(100vw - 2 * var(--spacing-lg));max-width:calc(100vw - 2 * var(--spacing-lg));right:var(--spacing-sm);margin-right:0;left:var(--spacing-sm);transform:none}.dropdown-item{padding:var(--spacing-sm);font-size:13px}.username{font-size:12px}.email{font-size:10px}}.sidebar{position:fixed;top:64px;left:0;width:256px;height:calc(100vh - 64px);background:var(--bg-gradient-secondary);border-right:1px solid var(--border-primary);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:1000;transition:all .3s cubic-bezier(.4,0,.2,1);overflow-y:auto;overflow-x:hidden}.sidebar.collapsed{width:80px;transform:translate(0)}.sidebar-tooltip{position:absolute;left:100%;top:50%;transform:translateY(-50%);background:var(--surface-overlay);color:var(--text-primary);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);font-size:12px;font-weight:500;white-space:nowrap;box-shadow:0 4px 16px var(--shadow-overlay);border:1px solid var(--border-primary);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:1005;animation:slideInLeft .2s ease;margin-left:var(--spacing-sm)}@keyframes slideInLeft{0%{opacity:0;transform:translateY(-50%) translate(-10px)}to{opacity:1;transform:translateY(-50%) translate(0)}}.sidebar-tooltip:before{content:"";position:absolute;left:-4px;top:50%;transform:translateY(-50%);width:0;height:0;border-top:4px solid transparent;border-bottom:4px solid transparent;border-right:4px solid var(--surface-overlay)}.sidebar-content{display:flex;flex-direction:column;height:100%;padding:0}.sidebar::-webkit-scrollbar{width:6px}.sidebar::-webkit-scrollbar-track{background:transparent}.sidebar::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:3px}.sidebar::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.new-chat-section{padding:var(--spacing-lg) var(--spacing-md) var(--spacing-md) var(--spacing-md);transition:all .3s ease}.new-chat-button{width:100%;background:var(--primary-gradient);border:none;border-radius:var(--radius-md);padding:var(--spacing-md) var(--spacing-lg);color:var(--text-primary);font-weight:600;font-size:14px;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);box-shadow:0 4px 16px var(--shadow-primary);position:relative;overflow:hidden;white-space:nowrap;text-decoration:none}.new-chat-button:disabled{opacity:.6;cursor:not-allowed;transform:none}.sidebar.collapsed .new-chat-button{padding:var(--spacing-md);justify-content:center;opacity:1;pointer-events:auto;width:48px;height:48px;border-radius:var(--radius-md)}.sidebar.collapsed .new-chat-button span{display:none}.sidebar.collapsed .new-chat-button svg{width:20px;height:20px}.new-chat-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s ease}.new-chat-button:hover:before{left:100%}.new-chat-button:hover{transform:translateY(-2px);box-shadow:0 8px 24px var(--shadow-primary);background:var(--primary-gradient-hover)}.new-chat-button:active{transform:translateY(0) scale(.98);box-shadow:0 4px 16px var(--shadow-primary);transition:all .1s ease}.new-chat-button svg{transition:transform .3s ease}.new-chat-button:hover svg{transform:rotate(90deg)}.chat-list-section{flex:1;overflow:hidden;display:flex;flex-direction:column;transition:all .3s ease}.section-header{padding:var(--spacing-lg) var(--spacing-md) var(--spacing-md) var(--spacing-md);transition:all .3s ease;display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-sm)}.section-header h3{font-size:12px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin:0;flex:1;text-align:left;transition:all .3s ease}.refresh-button:hover{color:var(--text-primary);background:var(--surface-secondary);transform:scale(1.1)}.refresh-button:disabled{opacity:.5;cursor:not-allowed;transform:none}.sidebar.collapsed .section-header{padding:var(--spacing-md) var(--spacing-sm) var(--spacing-sm) var(--spacing-sm);justify-content:center}.sidebar.collapsed .section-header h3{display:none}.sidebar.collapsed .refresh-button{width:32px;height:32px;padding:var(--spacing-xs)}.chat-list{flex:1;overflow-y:auto;padding:0 var(--spacing-md) var(--spacing-md) var(--spacing-md);transition:all .3s ease;scroll-behavior:smooth;max-height:calc(100vh - 300px)}.sidebar.collapsed .chat-list{padding:0 var(--spacing-xs);display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm)}.chat-list::-webkit-scrollbar{width:6px}.chat-list::-webkit-scrollbar-track{background:transparent;border-radius:3px}.chat-list::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:3px;transition:background .2s ease}.chat-list::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.chat-list::-webkit-scrollbar-thumb:active{background:var(--primary-color)}.chat-item{position:relative;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-md);cursor:pointer;outline:none;margin-bottom:var(--spacing-sm);padding-right:calc(var(--spacing-lg) + 40px)}.chat-item:focus{box-shadow:0 0 0 2px var(--primary-color);background:var(--surface-primary)}.chat-item:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.chat-item:hover{background:var(--surface-primary);transform:translate(2px);box-shadow:0 4px 16px var(--shadow-secondary);border-left:2px solid rgba(102,126,234,.4);transition:all .2s ease}.chat-item:not(.active):hover{background:var(--surface-secondary);border-left:2px solid rgba(102,126,234,.3)}.delete-button-container{position:absolute;right:var(--spacing-md);top:50%;transform:translateY(-50%);width:32px;height:32px;display:flex;align-items:center;justify-content:center;z-index:10}.delete-button{background:none;border:none;color:var(--status-error);cursor:pointer;padding:var(--spacing-xs);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all .2s ease;width:28px;height:28px;position:relative}.delete-button.hidden{opacity:0;pointer-events:none;transform:scale(.8)}.delete-button.visible{opacity:1;pointer-events:auto;transform:scale(1)}.delete-button:hover{background:rgba(239,68,68,.15);color:var(--status-error);transform:scale(1.05);box-shadow:0 2px 8px #ef44444d}.delete-button:active{transform:scale(.95);transition:all .1s ease}.delete-button:disabled{opacity:.5;cursor:not-allowed;transform:scale(1)}.delete-spinner{width:12px;height:12px;border:2px solid var(--status-error);border-top:2px solid transparent;border-radius:50%;animation:spin 1s linear infinite}.chat-item{border-radius:var(--radius-md);margin-bottom:var(--spacing-xs);transition:all .3s cubic-bezier(.4,0,.2,1);min-height:72px}.chat-item:hover{background:var(--surface-primary);box-shadow:0 4px 16px var(--shadow-secondary)}.chat-item.active{background:rgba(102,126,234,.2);border-left:4px solid var(--primary-color);box-shadow:0 4px 16px var(--shadow-primary);transform:translate(4px);border-radius:var(--radius-md);outline:1px solid rgba(102,126,234,.3);outline-offset:-1px}.sidebar.collapsed .chat-item{width:48px;height:48px;padding:var(--spacing-sm);justify-content:center;border-radius:var(--radius-md);margin-bottom:var(--spacing-sm)}.sidebar.collapsed .chat-item:hover{transform:translateY(-1px)}.sidebar.collapsed .chat-item.active{border-left:none;border-bottom:3px solid var(--primary-color)}.chat-item.active:hover{background:rgba(102,126,234,.25);transform:translate(4px);box-shadow:0 6px 20px var(--shadow-primary);border-left-color:var(--primary-color-light)}.sidebar.collapsed .chat-item.active:hover{transform:translateY(-1px)}.chat-item:active{transform:translate(2px) scale(.98);transition:all .1s ease}.sidebar.collapsed .chat-item:active{transform:translateY(-1px) scale(.98)}.chat-item.navigating{opacity:.7;pointer-events:none;transform:scale(.98)}.chat-item.navigating .chat-icon{animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.95)}}.chat-icon{width:36px;height:36px;background:var(--surface-primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);flex-shrink:0;transition:all .3s ease;border:1px solid var(--border-tertiary)}.sidebar.collapsed .chat-icon{width:32px;height:32px}.chat-item.active .chat-icon{background:rgba(102,126,234,.2);color:var(--primary-color);border-color:#667eea4d;box-shadow:0 0 0 1px #667eea33;transform:scale(1.05)}.chat-icon svg{transition:all .3s ease}.chat-item:hover .chat-icon{background:var(--surface-secondary);color:var(--text-secondary);transform:scale(1.05);border-color:var(--border-secondary)}.chat-item.active:hover .chat-icon{background:rgba(102,126,234,.25);color:var(--primary-color);transform:scale(1.1);border-color:#667eea66}.chat-item:active .chat-icon{transform:scale(.95);transition:all .1s ease}.chat-info{flex:1;min-width:0;transition:all .3s ease;display:flex;flex-direction:column;justify-content:center;gap:2px;align-items:flex-start}.sidebar.collapsed .chat-info{display:none}.chat-title{font-weight:600;color:var(--text-primary);margin:0;font-size:14px;line-height:1.4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;width:100%;transition:color .2s ease;text-shadow:0 1px 2px rgba(0,0,0,.1);text-align:left}.chat-item.active .chat-title{color:var(--text-primary);font-weight:700;text-shadow:0 1px 2px rgba(0,0,0,.2)}.chat-item:hover .chat-title{color:var(--text-primary)}.chat-preview{font-size:12px;color:var(--text-secondary);margin:0;line-height:1.3;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;width:100%;transition:color .2s ease;font-weight:400;text-align:left}.chat-item.active .chat-preview{color:#ffffffe6;font-weight:500}.chat-item:hover .chat-preview{color:var(--text-secondary)}.chat-meta{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--text-tertiary);gap:var(--spacing-sm);transition:color .2s ease;width:100%;margin:2px 0 0}.chat-item.active .chat-meta{color:#fffc}.chat-item:hover .chat-meta{color:var(--text-secondary)}.chat-date,.chat-count{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color .2s ease;font-size:11px;line-height:1.2}.chat-count{flex-shrink:0;text-align:left}.chat-date{flex-shrink:0;text-align:right;margin-left:auto}.chat-item.active .chat-date,.chat-item.active .chat-count{color:#ffffffe6;font-weight:600}.chat-item.active{background:rgba(102,126,234,.15);border-left:3px solid var(--primary-color);box-shadow:0 2px 8px var(--shadow-primary);transform:translate(2px);position:relative}.chat-item.active:after{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--primary-gradient);border-radius:0 2px 2px 0;animation:slideInLeft .3s ease}.sidebar.collapsed .chat-item.active{border-left:none;border-bottom:3px solid var(--primary-color);transform:translateY(-1px)}.chat-item.active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--primary-gradient);border-radius:0 2px 2px 0;transition:all .3s ease}.sidebar.collapsed .chat-item.active:before{left:auto;right:0;top:auto;bottom:0;width:auto;height:3px;border-radius:2px 2px 0 0}.chat-item.active:hover{background:rgba(102,126,234,.2);transform:translate(1px)}.sidebar.collapsed .chat-item.active:hover{transform:translateY(0)}.chat-list::-webkit-scrollbar{width:8px}.chat-list::-webkit-scrollbar-track{background:transparent;border-radius:4px;margin:4px 0}.chat-list::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:4px;transition:background .2s ease;border:2px solid transparent;background-clip:content-box}.chat-list::-webkit-scrollbar-thumb:hover{background:var(--text-secondary);background-clip:content-box}.chat-list::-webkit-scrollbar-thumb:active{background:var(--primary-color);background-clip:content-box}.chat-list{scrollbar-width:thin;scrollbar-color:var(--text-tertiary) transparent}.sidebar.collapsed .chat-preview,.sidebar.collapsed .chat-meta,.sidebar.collapsed .chat-title{display:none}.loading-chats{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl) var(--spacing-lg);color:var(--text-secondary);gap:var(--spacing-md);transition:all .3s ease}.sidebar.collapsed .loading-chats{padding:var(--spacing-2xl) var(--spacing-sm)}.loading-spinner{width:24px;height:24px;border:2px solid var(--surface-secondary);border-top:2px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl) var(--spacing-lg);color:var(--text-secondary);text-align:center;gap:var(--spacing-md);transition:all .3s ease}.sidebar.collapsed .empty-state{padding:var(--spacing-2xl) var(--spacing-sm)}.sidebar.collapsed .empty-state p,.sidebar.collapsed .empty-state span{display:none}.empty-state svg{color:var(--text-tertiary)}.empty-state p{font-size:14px;font-weight:500;color:var(--text-secondary);margin:0}.empty-state span{font-size:12px;color:var(--text-tertiary)}.status-section{padding:var(--spacing-md);border-top:1px solid var(--border-primary);display:flex;flex-direction:column;gap:var(--spacing-md);transition:all .3s ease;background:var(--surface-tertiary);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);margin-top:auto;position:sticky;bottom:0;z-index:10}.sidebar.collapsed .status-section{padding:var(--spacing-md) var(--spacing-sm);gap:var(--spacing-sm);justify-content:center}.status-indicator{display:flex;align-items:center;gap:var(--spacing-sm);transition:all .3s ease;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm);background:rgba(16,185,129,.1);border:1px solid rgba(16,185,129,.2)}.sidebar.collapsed .status-indicator{flex-direction:column;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-xs)}.status-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;animation:pulse 2s infinite}.status-text{font-size:12px;color:var(--text-secondary);font-weight:500;transition:all .3s ease;white-space:nowrap}.sidebar.collapsed .status-text{display:none}.status-details{display:flex;flex-direction:column;gap:var(--spacing-sm);align-items:flex-start}.sidebar.collapsed .status-details{display:none}.version-info{font-size:11px;color:var(--text-tertiary);transition:all .3s ease;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-xs);background:var(--surface-secondary);border:1px solid var(--border-secondary);white-space:nowrap;align-self:flex-end}.sidebar.collapsed .version-info{display:none}.timestamp{font-size:10px;color:var(--text-tertiary);text-align:center;margin-top:var(--spacing-xs);padding:2px var(--spacing-xs);border-radius:3px;background:var(--surface-tertiary);border:1px solid var(--border-tertiary);white-space:nowrap;align-self:flex-start}@media (max-width: 768px){.sidebar{position:fixed;top:64px;left:0;width:256px;height:calc(100vh - 104px);transform:translate(-100%);transition:transform .3s cubic-bezier(.4,0,.2,1)}.sidebar:not(.collapsed){transform:translate(0)}.sidebar.collapsed{transform:translate(-100%);width:80px}.new-chat-button{padding:var(--spacing-md) var(--spacing-lg);font-size:15px}.chat-item{padding:var(--spacing-md) var(--spacing-lg)}.chat-title{font-size:14px}.chat-meta{font-size:12px}.chat-list{max-height:calc(100vh - 320px)}.status-section{padding:var(--spacing-md) var(--spacing-lg);gap:var(--spacing-sm)}.status-details{gap:var(--spacing-xs)}.connection-status{font-size:10px;padding:2px var(--spacing-xs)}.timestamp{font-size:9px;padding:1px 3px}.version-info{font-size:10px;padding:3px var(--spacing-sm)}}@media (max-width: 480px){.sidebar{width:100%;top:64px}.new-chat-button{padding:var(--spacing-lg) var(--spacing-xl);font-size:16px}.chat-item{padding:var(--spacing-md) var(--spacing-xl)}.section-header h3{font-size:16px;padding:var(--spacing-lg) var(--spacing-xl)}.chat-list{max-height:calc(100vh - 340px)}.chat-item:hover{transform:translate(2px)}.chat-item.active:hover{transform:translate(1px)}.status-section{padding:var(--spacing-sm) var(--spacing-md);gap:var(--spacing-sm)}.status-indicator{padding:3px var(--spacing-sm)}.status-text{font-size:11px}.status-details{gap:var(--spacing-xs)}.connection-status{font-size:9px;padding:1px 3px}.timestamp{font-size:8px;padding:1px 2px}.version-info{font-size:9px;padding:2px var(--spacing-xs)}}.markdown-content{line-height:1.6;color:inherit;word-wrap:break-word;overflow-wrap:break-word}.markdown-paragraph{margin:0 0 var(--spacing-sm) 0;line-height:1.6}.markdown-paragraph:last-child{margin-bottom:0}.markdown-bold{font-weight:700;color:var(--text-primary)}.markdown-italic{font-style:italic;color:var(--text-secondary)}.markdown-inline-code{background:var(--surface-secondary);border:1px solid var(--border-secondary);border-radius:var(--radius-sm);padding:2px 6px;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.85em;color:var(--primary-color)}.markdown-code-block{background:var(--surface-tertiary);border:1px solid var(--border-secondary);border-radius:var(--radius-md);padding:var(--spacing-md);margin:var(--spacing-sm) 0;overflow-x:auto;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.9em;line-height:1.4}.markdown-code-block code{background:none;border:none;padding:0;color:var(--text-primary)}.markdown-heading{font-weight:700;color:var(--text-primary);margin:var(--spacing-md) 0 var(--spacing-sm) 0;line-height:1.3}.markdown-h1{font-size:1.5em;border-bottom:2px solid var(--border-secondary);padding-bottom:var(--spacing-xs)}.markdown-h2{font-size:1.3em;border-bottom:1px solid var(--border-tertiary);padding-bottom:var(--spacing-xs)}.markdown-h3{font-size:1.2em}.markdown-h4{font-size:1.1em}.markdown-h5,.markdown-h6{font-size:1em}.markdown-list{margin:var(--spacing-sm) 0;padding-left:var(--spacing-lg)}.markdown-ordered-list{list-style-type:decimal}.markdown-list ul,.markdown-list ol{margin-top:0;margin-bottom:0}.markdown-list-item{margin:var(--spacing-xs) 0;line-height:1.6}.markdown-link{color:var(--primary-color);text-decoration:underline;text-decoration-color:#667eea66;transition:all .2s ease}.markdown-link:hover{color:var(--primary-color-light);text-decoration-color:var(--primary-color-light)}.markdown-blockquote{border-left:4px solid var(--primary-color);background:var(--surface-secondary);margin:var(--spacing-sm) 0;padding:var(--spacing-sm) var(--spacing-md);border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-style:italic;color:var(--text-secondary)}.markdown-blockquote p{margin:0}.markdown-table{border-collapse:collapse;margin:var(--spacing-md) 0;width:100%;border:1px solid var(--border-secondary);border-radius:var(--radius-md);overflow:hidden}.markdown-table-header{background:var(--surface-secondary);font-weight:600;color:var(--text-primary);border-bottom:2px solid var(--border-secondary);padding:var(--spacing-sm) var(--spacing-md);text-align:left}.markdown-table-cell{border-bottom:1px solid var(--border-tertiary);padding:var(--spacing-sm) var(--spacing-md);color:var(--text-secondary)}.markdown-table-row:hover{background:var(--surface-tertiary)}.markdown-table-row:last-child .markdown-table-cell{border-bottom:none}.markdown-content hr{border:none;height:1px;background:var(--border-secondary);margin:var(--spacing-lg) 0}.markdown-content input[type=checkbox]{margin-right:var(--spacing-xs);accent-color:var(--primary-color)}@media (max-width: 768px){.markdown-code-block{font-size:.8em;padding:var(--spacing-sm)}.markdown-table{font-size:.9em}.markdown-table-cell,.markdown-table-header{padding:var(--spacing-xs) var(--spacing-sm)}.markdown-h1{font-size:1.3em}.markdown-h2{font-size:1.2em}}.chat-interface{display:flex;flex-direction:column;height:100%;background:var(--bg-gradient-primary);position:relative;overflow:hidden}.chat-title-header{padding:var(--spacing-lg) var(--spacing-2xl);background:var(--surface-tertiary);border-bottom:1px solid var(--border-primary);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);min-height:72px;flex-wrap:wrap;box-sizing:border-box}.chat-title-edit-form{display:flex;align-items:center;gap:var(--spacing-sm);flex:1}.chat-title-input{background:var(--surface-primary);border:2px solid var(--border-focus);border-radius:var(--radius-sm);padding:var(--spacing-xs) var(--spacing-sm);color:var(--text-primary);font-size:16px;font-weight:600;flex:1;outline:none}.chat-title-display{display:flex;align-items:center;gap:var(--spacing-sm);cursor:pointer;padding:var(--spacing-xs);border-radius:var(--radius-sm);transition:all .2s ease;flex:1}.chat-title-display:hover{background:var(--surface-primary)}.chat-title{font-size:20px;font-weight:700;color:var(--text-primary);margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;line-height:1.4;text-shadow:0 1px 2px rgba(0,0,0,.1)}.chat-info-badge{font-size:13px;color:var(--text-tertiary);display:flex;align-items:center;gap:var(--spacing-sm);background:var(--surface-primary);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm);border:1px solid var(--border-secondary);font-weight:500;flex-shrink:0;min-width:fit-content}.chat-messages{flex:1;overflow-y:auto;padding:calc(var(--spacing-2xl) + 16px) var(--spacing-2xl) calc(100px + var(--spacing-2xl)) var(--spacing-2xl);scroll-behavior:smooth;position:relative;min-height:0;display:flex;flex-direction:column;gap:0}.search-bar{position:sticky;top:0;background:var(--surface-overlay);border:1px solid var(--border-primary);border-radius:var(--radius-md);padding:var(--spacing-md);margin-bottom:var(--spacing-lg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:10;display:flex;align-items:center;gap:var(--spacing-sm)}.search-input{flex:1;background:transparent;border:none;outline:none;color:var(--text-primary);font-size:14px}.search-results{font-size:12px;color:var(--text-tertiary);margin-right:var(--spacing-sm)}.search-button{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:var(--spacing-xs);border-radius:var(--radius-sm);transition:all .2s ease}.search-button:disabled{color:var(--text-quaternary);cursor:default}.search-button:hover:not(:disabled){background:var(--surface-primary);color:var(--text-primary)}.empty-chat-state{display:flex;align-items:center;justify-content:center;flex:1;padding:var(--spacing-2xl) var(--spacing-lg);min-height:0;text-align:center}.empty-chat-content{max-width:500px;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center}.empty-chat-icon{width:80px;height:80px;background:var(--primary-gradient);border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:var(--spacing-lg);box-shadow:0 8px 32px var(--shadow-primary)}.empty-chat-title{font-size:2rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-md);line-height:1.2;word-wrap:break-word;overflow-wrap:break-word;white-space:normal;text-align:center;width:100%;max-width:100%}.empty-chat-description{font-size:1.1rem;color:var(--text-secondary);line-height:1.6;margin:0;word-wrap:break-word;overflow-wrap:break-word;white-space:normal;text-align:center;width:100%;max-width:100%}.empty-chat-actions{margin-top:var(--spacing-lg);display:flex;gap:var(--spacing-md);flex-wrap:wrap;justify-content:center}.message-container{display:flex;gap:var(--spacing-lg);padding:var(--spacing-xl) 0;opacity:1;position:relative;margin-bottom:var(--spacing-md);border-bottom:1px solid var(--border-tertiary);padding-bottom:var(--spacing-xl)}.message-container:last-child{border-bottom:none;margin-bottom:0;padding-bottom:var(--spacing-lg)}.message-container.user{flex-direction:row-reverse;justify-content:flex-end}.message-container.assistant{flex-direction:row;justify-content:flex-start}.message-container.streaming{border-top:1px solid var(--border-tertiary);padding-top:var(--spacing-xl)}.message-avatar{width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:0 4px 16px var(--shadow-secondary);border:2px solid var(--border-secondary)}.message-avatar.user{background:var(--primary-gradient)}.message-avatar.assistant{background:var(--status-success)}.message-avatar img{width:20px;height:20px;filter:brightness(0) invert(1)}.message-content-wrapper{display:flex;flex-direction:column;max-width:75%;position:relative}.message-content-wrapper.user{align-items:flex-end}.message-content-wrapper.assistant{align-items:flex-start}.message-content{border-radius:var(--radius-lg);padding:var(--spacing-md) var(--spacing-lg);color:var(--text-primary);line-height:1.6;word-wrap:break-word;overflow-wrap:break-word;white-space:pre-wrap;max-width:100%;position:relative;font-size:15px;border:1px solid var(--border-primary)}.message-content.user{background:var(--primary-gradient);border-radius:var(--radius-lg) var(--radius-sm) var(--radius-lg) var(--radius-lg);border-color:var(--primary-color);box-shadow:0 4px 16px var(--shadow-primary)}.message-content.assistant{background:var(--surface-primary);border-radius:var(--radius-sm) var(--radius-lg) var(--radius-lg) var(--radius-lg);box-shadow:0 2px 8px var(--shadow-secondary)}.message-content.streaming{min-height:24px}.message-content .typing-cursor{opacity:.7;animation:typing-cursor 1s infinite}@keyframes typing-cursor{0%,50%{opacity:1}51%,to{opacity:0}}.message-edit-form{background:var(--surface-primary);border:2px solid var(--border-focus);border-radius:var(--radius-lg);padding:var(--spacing-md);width:100%;box-shadow:0 4px 16px var(--shadow-secondary)}.message-edit-textarea{width:100%;background:transparent;border:none;outline:none;resize:none;font-size:14px;line-height:1.6;color:var(--text-primary);font-family:inherit;min-height:60px;max-height:200px}.message-edit-actions{display:flex;gap:var(--spacing-sm);margin-top:var(--spacing-sm);justify-content:flex-end}.message-edit-save,.message-edit-cancel{border:none;border-radius:var(--radius-sm);padding:var(--spacing-xs) var(--spacing-sm);cursor:pointer;font-size:12px;font-weight:500;transition:all .2s ease}.message-edit-save{background:var(--status-success);color:var(--text-primary)}.message-edit-cancel{background:var(--surface-secondary);border:1px solid var(--border-primary);color:var(--text-secondary)}.message-actions{position:absolute;top:4px;background:var(--surface-overlay);border:1px solid var(--border-primary);border-radius:var(--radius-md);padding:var(--spacing-xs);display:flex;gap:var(--spacing-xs);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 4px 16px var(--shadow-overlay);z-index:10}.message-actions.user{right:0}.message-actions.assistant{left:0}.message-action-button{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:var(--spacing-xs);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all .2s ease;width:28px;height:28px}.message-action-button:hover{background:var(--surface-primary);color:var(--text-primary)}.message-action-button svg{width:14px;height:14px}.message-timestamp{font-size:11px;color:var(--text-tertiary);margin-top:var(--spacing-sm);padding:0 var(--spacing-sm);font-weight:500;letter-spacing:.3px}.message-timestamp.user{text-align:right}.message-timestamp.assistant{text-align:left}.loading-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.1);display:flex;align-items:center;justify-content:center;z-index:100;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.typing-indicator{display:flex;align-items:center;gap:var(--spacing-xs);color:var(--text-tertiary);font-size:12px;font-style:italic}.typing-dots{display:flex;gap:2px}.typing-dot{width:4px;height:4px;background:var(--text-tertiary);border-radius:50%;animation:typing 1.4s infinite ease-in-out}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.4}30%{transform:translateY(-10px);opacity:1}}.chat-input-container{position:fixed;bottom:0;left:0;right:0;background:var(--bg-gradient-overlay);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-top:1px solid var(--border-primary);padding:var(--spacing-lg) var(--spacing-2xl);z-index:100;width:100%;box-sizing:border-box;transition:left .3s cubic-bezier(.4,0,.2,1);box-shadow:0 -4px 16px #0000001a}.chat-input-container.sidebar-open{left:250px}.chat-input-form{max-width:800px;margin:0 auto;width:100%;box-sizing:border-box}.input-wrapper{display:flex;align-items:flex-end;gap:var(--spacing-md);background:var(--surface-primary);border:2px solid var(--border-primary);border-radius:var(--radius-lg);padding:var(--spacing-md) var(--spacing-lg);transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);width:100%;box-sizing:border-box;min-height:64px;box-shadow:0 4px 16px var(--shadow-secondary)}.input-wrapper:focus-within{border-color:var(--border-focus);box-shadow:0 0 0 4px #667eea26;background:var(--surface-secondary);transform:translateY(-1px)}.file-upload-button{background:none;border:none;color:var(--text-tertiary);cursor:pointer;padding:var(--spacing-sm);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all .2s ease;flex-shrink:0;width:40px;height:40px}.file-upload-button:hover{background:var(--surface-secondary);color:var(--text-secondary)}.file-upload-button svg{width:20px;height:20px}.selected-file{display:flex;align-items:center;gap:var(--spacing-sm);background:var(--surface-secondary);border:1px solid var(--border-secondary);border-radius:var(--radius-sm);padding:var(--spacing-xs) var(--spacing-sm);font-size:12px;color:var(--text-secondary);max-width:200px;overflow:hidden}.selected-file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.remove-file-button{background:none;border:none;color:var(--text-quaternary);cursor:pointer;padding:2px;border-radius:2px;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.remove-file-button:hover{color:var(--status-error);background:rgba(239,68,68,.1)}.remove-file-button svg{width:10px;height:10px}.message-textarea{flex:1;background:transparent;border:none;outline:none;resize:none;font-size:16px;line-height:1.5;color:var(--text-primary);font-family:inherit;min-height:32px;max-height:120px;width:100%;box-sizing:border-box;padding:0;margin:0}.message-textarea::placeholder{color:var(--text-tertiary);opacity:.8}.send-button{background:var(--primary-gradient);border:none;border-radius:var(--radius-md);padding:var(--spacing-md);color:var(--text-primary);cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;width:48px;height:48px;flex-shrink:0;box-shadow:0 4px 16px var(--shadow-primary);font-weight:600}.send-button:disabled{opacity:.6;cursor:not-allowed;transform:none}.send-button:not(:disabled):hover{background:var(--primary-gradient-hover);transform:scale(1.05) translateY(-1px);box-shadow:0 6px 20px var(--shadow-primary)}.send-button:not(:disabled):active{transform:scale(.95) translateY(0)}.send-button img{width:24px;height:24px;filter:brightness(0) invert(1)}.error-overlay{position:fixed;top:80px;left:50%;transform:translate(-50%);background:var(--surface-overlay);border:1px solid var(--border-primary);color:var(--text-primary);padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-md);z-index:200;max-width:500px;text-align:center;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 8px 32px var(--shadow-overlay);display:flex;flex-direction:column;gap:var(--spacing-sm);align-items:center}.error-header{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--status-error)}.error-header svg{width:16px;height:16px}.error-title{font-weight:600}.error-retry-button{background:var(--primary-gradient);border:none;border-radius:var(--radius-sm);padding:var(--spacing-xs) var(--spacing-md);color:var(--text-primary);cursor:pointer;font-size:12px;font-weight:500;transition:all .2s ease}.error-retry-button:hover{background:var(--primary-gradient-hover);transform:translateY(-1px)}@media (max-width: 768px){.chat-title-header{padding:var(--spacing-md) var(--spacing-lg);min-height:64px}.chat-messages{padding:var(--spacing-lg) var(--spacing-lg) calc(90px + var(--spacing-lg)) var(--spacing-lg)}.message-container{gap:var(--spacing-md);padding:var(--spacing-lg) 0}.message-avatar{width:36px;height:36px}.message-content-wrapper{max-width:80%}.message-content{padding:var(--spacing-sm) var(--spacing-md);font-size:14px}.chat-input-container{padding:var(--spacing-md) var(--spacing-lg);bottom:0;left:0!important}.input-wrapper{padding:var(--spacing-sm) var(--spacing-md);gap:var(--spacing-sm)}.message-textarea{font-size:14px}.send-button{width:44px;height:44px}}@media (max-width: 768px){.chat-title-header{padding:var(--spacing-md) var(--spacing-lg);min-height:64px;flex-wrap:wrap}.chat-messages{padding:var(--spacing-md);gap:var(--spacing-md)}.message-container{gap:var(--spacing-sm);padding:var(--spacing-sm)}.message-content-wrapper{max-width:90%}.chat-input-container{padding:var(--spacing-md);position:sticky;bottom:0;left:0;right:0;width:100%;margin:0}.input-wrapper{min-height:48px;padding:var(--spacing-sm) var(--spacing-md)}.chat-input{font-size:16px;line-height:1.4;padding:var(--spacing-sm)}.send-button,.file-upload-button{min-width:44px;min-height:44px;touch-action:manipulation}}@media (max-width: 480px){.chat-title-header{padding:var(--spacing-sm) var(--spacing-md);min-height:56px}.chat-title{font-size:16px}.chat-messages{padding:var(--spacing-sm);gap:var(--spacing-sm)}.message-container{gap:var(--spacing-xs);padding:var(--spacing-xs)}.message-avatar{width:32px;height:32px;flex-shrink:0}.message-content-wrapper{max-width:85%;min-width:0}.message-content{font-size:14px;line-height:1.5;word-break:break-word}.chat-input-container{padding:var(--spacing-sm);position:sticky;bottom:0;left:0;right:0;width:100%;box-sizing:border-box}.input-wrapper{padding:var(--spacing-xs) var(--spacing-sm);min-height:48px;max-height:120px}.chat-input{font-size:16px;max-height:80px;padding:var(--spacing-xs) var(--spacing-sm)}.send-button{width:42px;height:42px;min-width:42px;min-height:42px}.file-upload-button{width:38px;height:38px;min-width:38px;min-height:38px}.message-timestamp{font-size:11px}.message-actions{gap:var(--spacing-xs)}.code-block{font-size:12px;padding:var(--spacing-sm);overflow-x:auto;max-width:100%}}@media (max-width: 375px){.chat-title-header{padding:var(--spacing-xs) var(--spacing-sm)}.chat-messages,.chat-input-container{padding:var(--spacing-xs)}.message-content{font-size:13px}.input-wrapper{min-height:44px}.send-button,.file-upload-button{width:40px;height:40px;min-width:40px;min-height:40px}}.chat-page{height:100vh;overflow:hidden;display:flex;flex-direction:column;position:relative}.chat-area{flex:1;overflow:hidden;position:relative;display:flex;flex-direction:column;height:100%;min-width:0}.chat-area .welcome-message{display:flex;align-items:center;justify-content:center;height:100%;text-align:center;padding:var(--spacing-2xl)}.main-content{height:calc(100vh - 64px)}.main-content{flex:1;overflow:hidden;display:flex;position:relative;height:calc(100vh - 64px);width:100%}.page-content{flex:1;overflow:hidden;position:relative;display:flex;flex-direction:column;height:100%;margin-left:0;min-width:0;transition:all .3s ease-out}.page-content.sidebar-open{margin-left:256px}@media (max-width: 768px){.page-content,.page-content.sidebar-open{margin-left:0!important}.main-content{height:calc(100vh - 64px)}}.profile-content,.settings-content{padding:1.5rem;max-width:64rem;margin:0 auto;width:100%}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,#0f0f23 0%,#1a1a2e 50%,#16213e 100%);color:#fff;overflow:hidden;height:100vh}body.auth-page{overflow:auto;overflow-x:hidden}#root{height:100vh;display:flex;flex-direction:column}#root.auth-page{height:100vh;overflow:auto}.App{display:flex;height:100vh;background:var(--bg-gradient-primary);overflow:hidden}.App.auth-page{display:block;height:auto;overflow:visible;background:none}.header{position:fixed;top:0;left:0;right:0;height:64px;z-index:var(--z-fixed)}.main-content{flex:1;margin-left:250px;margin-top:64px;height:calc(100vh - 64px);display:flex;flex-direction:column;transition:margin-left .3s ease;overflow:hidden}.sidebar{position:fixed;top:64px;left:0;width:250px;height:calc(100vh - 64px);z-index:var(--z-fixed);transition:transform .3s ease}.sidebar.collapsed{transform:translate(-100%)}.sidebar.collapsed+.main-content{margin-left:0}.chat-interface{flex:1;display:flex;flex-direction:column;height:100%;min-height:0;overflow:hidden}.chat-messages{flex:1;overflow-y:auto;overflow-x:hidden;min-height:0;display:flex;flex-direction:column;gap:var(--spacing-md);padding:var(--spacing-lg);scroll-behavior:smooth}.chat-input-container{flex-shrink:0;position:sticky;bottom:0;background:var(--bg-gradient-overlay);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-top:1px solid var(--border-primary);padding:var(--spacing-lg) var(--spacing-xl);z-index:var(--z-sticky);width:100%;box-sizing:border-box}.message-content{word-wrap:break-word;overflow-wrap:break-word;white-space:pre-wrap;max-width:100%;line-height:1.6;-webkit-hyphens:auto;hyphens:auto}.header h1{font-size:1.5rem;font-weight:700;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0}.header-actions{display:flex;align-items:center;gap:1rem}.sidebar-header{padding:1.5rem;border-bottom:1px solid rgba(255,255,255,.1)}.new-chat-btn{width:100%;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:12px;padding:1rem;color:#fff;font-weight:600;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:.5rem;box-shadow:0 8px 32px #667eea4d}.new-chat-btn:hover{transform:translateY(-2px);box-shadow:0 12px 40px #667eea66}.sidebar-content{flex:1;overflow-y:auto;padding:1rem}.chat-list{list-style:none}.chat-item{padding:.75rem 1rem;margin-bottom:.5rem;background:rgba(255,255,255,.05);border-radius:8px;cursor:pointer;transition:all .3s ease;border:1px solid transparent}.chat-item:hover{background:rgba(255,255,255,.1);border-color:#667eea4d;transform:translate(5px)}.chat-item.active{background:linear-gradient(135deg,rgba(102,126,234,.2) 0%,rgba(118,75,162,.2) 100%);border-color:#667eea80}.loading-spinner{display:inline-block;width:20px;height:20px;border:2px solid rgba(255,255,255,.3);border-top:2px solid #667eea;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.btn{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:8px;padding:.75rem 1.5rem;color:#fff;font-weight:600;cursor:pointer;transition:all .3s ease;text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;box-shadow:0 4px 16px #667eea4d}.btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px #667eea66}.btn-secondary{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2)}.btn-secondary:hover{background:rgba(255,255,255,.15)}.form-group{margin-bottom:1.5rem}.form-label{display:block;margin-bottom:.5rem;font-weight:600;color:#fff}.form-input{width:100%;padding:.75rem 1rem;background:rgba(255,255,255,.08);border:2px solid rgba(255,255,255,.1);border-radius:8px;color:#fff;font-size:1rem;transition:all .3s ease}.form-input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 4px #667eea1a;background:rgba(255,255,255,.12)}.form-input::placeholder{color:#888}.card{background:rgba(255,255,255,.05);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:2rem;box-shadow:0 8px 32px #0003}.text-center{text-align:center}.text-gradient{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.glass-effect{background:rgba(255,255,255,.05);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.1)}@media (max-width: 1200px){.sidebar{width:280px}.main-content{margin-left:280px}.chat-messages{padding:var(--spacing-lg)}}@media (max-width: 768px){.header{height:60px}.sidebar{width:100%;top:60px;height:calc(100vh - 60px);transform:translate(-100%);z-index:1100;background:var(--bg-gradient-primary);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.sidebar:not(.collapsed){transform:translate(0)}.main-content{margin-left:0;margin-top:60px;height:calc(100vh - 60px)}.chat-messages{padding:var(--spacing-md);gap:var(--spacing-sm)}.chat-input-container{padding:var(--spacing-md)}.sidebar:not(.collapsed):before{content:"";position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,.5);z-index:-1}}@media (max-width: 480px){.header{height:56px;padding:0 var(--spacing-md)}.sidebar{top:56px;height:calc(100vh - 56px)}.main-content{margin-top:56px;height:calc(100vh - 56px)}.chat-messages{padding:var(--spacing-sm);gap:var(--spacing-xs)}.chat-input-container{padding:var(--spacing-sm)}body{font-size:14px}.card{padding:var(--spacing-lg);border-radius:var(--radius-md)}.btn{padding:.625rem 1.25rem;font-size:14px}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:rgba(255,255,255,.05)}::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#5a6fd8 0%,#6a4190 100%)}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .5s ease-out}*:focus{outline:2px solid #667eea;outline-offset:2px}::selection{background:rgba(102,126,234,.3);color:#fff}