body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--bg-secondary);min-height:100vh;color:var(--text-primary);transition:background-color .2s ease,color .2s ease;display:flex;align-items:center;justify-content:center;padding:clamp(12px,3vw,20px);line-height:1.5;overflow:auto}.login-container{width:min(90%,400px);background:var(--bg-elevated);border-radius:16px;border:1px solid var(--border-primary);box-shadow:var(--shadow-lg);overflow:hidden;margin:0 auto;max-height:90vh;display:flex;flex-direction:column}.login-content{overflow-y:auto;max-height:calc(90vh - 80px);flex:1}.login-content::-webkit-scrollbar{width:6px}.login-content::-webkit-scrollbar-track{background:transparent;border-radius:3px}.login-content::-webkit-scrollbar-thumb{background:var(--border-primary);border-radius:3px}.login-content::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.verification-container{width:min(90%,350px);background:var(--bg-elevated);border-radius:16px;border:1px solid var(--border-primary);box-shadow:var(--shadow-lg);overflow:hidden;margin:0 auto;padding:20px;text-align:center;max-height:90vh;overflow-y:auto}.verification-icon-container{display:flex;justify-content:center;margin-bottom:20px}.verification-icon{position:relative;height:50px;display:flex;justify-content:center;align-items:center}.spinner{position:absolute;top:0;left:0;width:100%;height:100%;border:3px solid rgba(52,152,219,.2);border-radius:50%;border-top-color:var(--accent-primary);animation:spin 1.5s linear infinite}.icon{font-size:20px;color:var(--accent-primary);position:relative;z-index:2}.status-title{font-size:1.4rem;font-weight:700;color:var(--text-primary);margin-bottom:10px}.status-message{font-size:.9rem;color:var(--text-secondary);margin-bottom:20px;line-height:1.5}.verification-icon-error{font-size:48px;color:var(--accent-primary);margin-bottom:20px}.success-icon{color:#10b981}.error-icon{color:#ef4444}.login-header{padding:25px 25px 20px;text-align:center;flex-shrink:0}.logo{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:20px}.logo-icon{position:relative;width:35px;height:35px;display:flex;align-items:center;justify-content:center}.logo-icon .gear{font-size:35px;color:var(--accent-primary);position:absolute}.logo-icon .robot{font-size:18px;color:#fff;z-index:1;filter:drop-shadow(0 0 .5px #1a1a1a)}.logo-text{font-size:1.4rem;font-weight:700;color:var(--text-primary)}.login-title{font-size:1.4rem;font-weight:700;color:var(--text-primary);margin-bottom:8px}.login-subtitle{font-size:.9rem;color:var(--text-secondary);margin-bottom:15px;line-height:1.5}.back-to-landing{background:none;border:1px solid var(--border-primary);color:var(--text-secondary);padding:8px 16px;border-radius:8px;font-size:.85rem;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;gap:8px;margin:0 auto}.back-to-landing:hover{background:var(--bg-secondary);color:var(--accent-primary);border-color:var(--accent-primary)}.login-form{padding:0 25px 25px;flex:1;overflow-y:auto}.form-group{margin-bottom:18px}.form-label{display:block;font-size:.85rem;font-weight:500;color:var(--text-primary);margin-bottom:8px}.form-input{width:100%;border:1px solid var(--border-secondary);border-radius:8px;padding:12px 14px;font-size:.85rem;outline:none;transition:all .2s ease;background:var(--bg-primary);color:var(--text-primary);font-family:inherit}.form-input:focus{box-shadow:0 0 0 3px #3b82f61a}.form-input::placeholder{color:var(--text-muted)}.password-container{position:relative}.password-toggle{position:absolute;right:12px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;border-radius:4px;transition:color .2s ease}.password-toggle:hover{color:var(--text-secondary)}.form-options{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;font-size:.85rem}.remember-me{display:flex;align-items:center;gap:8px;color:var(--text-secondary)}.remember-me input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent-primary)}.link-button{background:none;border:none;color:var(--accent-primary);cursor:pointer;padding:0;margin-left:4px;font:inherit;font-size:.85rem}.link-button:hover{color:var(--accent-hover)}.forgot-password{color:var(--accent-primary);text-decoration:none;font-weight:500;transition:color .2s ease;font-size:.85rem}.forgot-password:hover{color:var(--accent-hover)}.btn{width:100%;padding:12px 16px;border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s ease;border:1px solid transparent;display:flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;font-family:inherit}.btn-primary{background:var(--accent-primary);color:#fff;margin-bottom:15px}.btn-google{background:var(--bg-primary);color:var(--text-primary);border:1px solid var(--border-secondary);margin-bottom:20px}.btn-google:hover{background:var(--bg-secondary);border-color:var(--border-primary);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.google-icon{display:inline-block!important;width:18px!important;height:18px!important;background:url(https://www.google.com/favicon.ico) no-repeat center!important;background-size:contain!important}.btn-secondary{background:var(--bg-primary);color:var(--accent-primary);border:1px solid var(--border-secondary)}.btn-secondary:hover{background:var(--bg-secondary);border-color:var(--border-primary);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.spinner-container{position:relative;height:60px;margin:20px 0}.spinner{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:48px;height:48px;border:4px solid rgba(52,152,219,.2);border-radius:50%;border-top-color:#3498db;animation:spin 1s linear infinite}@keyframes spin{to{transform:translate(-50%,-50%) rotate(360deg)}}#loading-state{text-align:center;padding:25px;position:relative}.info-box{background:var(--bg-secondary);padding:12px;border-radius:8px;margin:15px 0;border-left:4px solid var(--accent-primary);color:var(--text-secondary);box-shadow:var(--shadow-sm);font-size:.85rem;text-align:left;line-height:1.5}.info-box i{color:var(--accent-primary);margin-right:8px}.success-details{background:var(--bg-secondary);padding:12px;border-radius:8px;margin:15px 0;border-left:4px solid var(--accent-primary);color:var(--text-secondary);box-shadow:var(--shadow-sm);font-size:.85rem;text-align:left;line-height:1.5}.divider{display:flex;align-items:center;margin:20px 0;color:var(--text-muted);font-size:.85rem}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--border-primary)}.divider span{padding:0 12px}.register-link{text-align:center;padding:20px 25px;border-top:1px solid var(--border-primary);color:var(--text-secondary);font-size:.85rem;flex-shrink:0;background:var(--bg-elevated)}.register-link a{color:var(--accent-primary);text-decoration:none;font-weight:500;transition:color .2s ease}.register-link a:hover{color:var(--accent-hover)}.theme-toggle{position:fixed;top:15px;right:20px;background:var(--text-bg);color:#fff;border:1px solid var(--accent-border);border-radius:50%;width:38px;height:38px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease;z-index:100}.theme-toggle:hover{background:var(--text-bg);color:#fff}@media (max-width: 480px){body{padding:15px;display:flex;align-items:center;justify-content:center;min-height:100vh}.login-container{width:100%;max-width:100%;margin:0 auto;max-height:85vh;border-radius:12px}.login-header{padding:20px 20px 15px}.login-form{padding:0 20px 20px}.theme-toggle{top:10px;right:15px;width:40px;height:40px}.verification-container{width:100%;max-width:100%;margin:0 auto;border-radius:12px;max-height:85vh;padding:20px 15px}.register-link{padding:15px 20px}}@media (min-width: 481px) and (max-width: 767px){.login-container{width:85%;max-width:380px}.verification-container{width:85%;max-width:350px}}@media (min-width: 768px) and (max-width: 1023px){.login-container{width:80%;max-width:420px}.verification-container{width:80%;max-width:380px}}@media (min-width: 1024px){.login-container{width:400px}.verification-container{width:380px}}button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--border-focus);outline-offset:2px}.btn.loading{opacity:.7;cursor:not-allowed}.btn.loading:after{content:"";width:16px;height:16px;border:2px solid transparent;border-top:2px solid currentColor;border-radius:50%;animation:spin 1s linear infinite;margin-left:8px}.modal-overlay{position:fixed;inset:0;background-color:#000c;display:flex;justify-content:center;align-items:center;z-index:1000;padding:20px}.modal-content{background:#fff;border-radius:12px;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a;max-width:800px;width:100%;max-height:90vh;overflow:hidden;position:relative}[data-theme=dark] .modal-content{background:#1a1a1a;border:1px solid #333333}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid #e5e7eb;background:#f9fafb}[data-theme=dark] .modal-header{background:#2d2d2d;border-bottom:1px solid #404040}.modal-header h2{margin:0;color:#111827;font-size:1.5rem;font-weight:600}[data-theme=dark] .modal-header h2{color:#f9fafb}.close-btn{background:none;border:none;color:#6b7280;font-size:1.2rem;cursor:pointer;padding:8px;border-radius:6px;transition:background-color .2s ease}[data-theme=dark] .close-btn{color:#d1d5db}.close-btn:hover{background-color:#f3f4f6}[data-theme=dark] .close-btn:hover{background-color:#374151}.modal-body{padding:24px;overflow-y:auto;max-height:calc(90vh - 140px);background:#fff}[data-theme=dark] .modal-body{background:#1a1a1a}.modal-footer{padding:20px 24px;border-top:1px solid #e5e7eb;background:#f9fafb;display:flex;justify-content:flex-end}[data-theme=dark] .modal-footer{background:#2d2d2d;border-top:1px solid #404040}.terms-content,.privacy-content{line-height:1.6;color:#374151}[data-theme=dark] .terms-content,[data-theme=dark] .privacy-content{color:#d1d5db}.terms-content h3,.privacy-content h3{color:#2563eb;margin-top:24px;margin-bottom:12px;font-size:1.1rem;font-weight:600}[data-theme=dark] .terms-content h3,[data-theme=dark] .privacy-content h3{color:#60a5fa}.terms-content h3:first-child,.privacy-content h3:first-child{margin-top:0}.terms-content p,.privacy-content p{margin-bottom:16px;color:#6b7280}[data-theme=dark] .terms-content p,[data-theme=dark] .privacy-content p{color:#9ca3af}.terms-content ul,.privacy-content ul{margin-bottom:16px;padding-left:20px}.terms-content li,.privacy-content li{margin-bottom:8px;color:#6b7280}[data-theme=dark] .terms-content li,[data-theme=dark] .privacy-content li{color:#9ca3af}.agreement-checkbox{display:flex;align-items:flex-start;gap:10px;margin:15px 0;padding:12px;background:var(--bg-secondary);border-radius:8px;border:1px solid var(--border-primary);font-size:.85rem}[data-theme=dark] .agreement-checkbox{background:#2d2d2d;border:1px solid #404040}.agreement-checkbox input[type=checkbox]{margin:2px 0 0;flex-shrink:0}.agreement-checkbox label{margin:0;font-size:.85rem;line-height:1.4;color:var(--text-secondary);cursor:pointer}[data-theme=dark] .agreement-checkbox label{color:#9ca3af}.agreement-checkbox a{color:var(--accent-primary);text-decoration:none;font-weight:500}[data-theme=dark] .agreement-checkbox a{color:#60a5fa}.agreement-checkbox a:hover{text-decoration:underline}.agreement-error{color:#dc2626;font-size:.8rem;margin-top:6px;display:flex;align-items:center;gap:5px}[data-theme=dark] .agreement-error{color:#f87171}.agreement-error i{font-size:.85rem}.btn.loading{position:relative;opacity:.8;cursor:not-allowed}.button-spinner{width:16px;height:16px;border:2px solid transparent;border-top:2px solid currentColor;border-radius:50%;animation:spin 1s linear infinite;margin-right:6px}.spinner-small{width:14px;height:14px;border:2px solid transparent;border-top:2px solid var(--accent-primary);border-radius:50%;animation:spin 1s linear infinite}.google-login-wrapper{position:relative}.loading-overlay{position:absolute;inset:0;background:#fffc;display:flex;align-items:center;justify-content:center;border-radius:8px;z-index:10}[data-theme=dark] .loading-overlay{background:#0009}.form-input:disabled,.password-toggle:disabled,.remember-me input:disabled,.link-button:disabled{opacity:.6;cursor:not-allowed}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.btn{transition:all .3s ease}.btn:disabled{transform:none;box-shadow:none}.btn:focus-visible{outline:2px solid var(--border-focus);outline-offset:2px}@media (max-width: 480px){.button-spinner{width:14px;height:14px;margin-right:5px}.spinner-small{width:12px;height:12px}}.register-swal{background:var(--bg-elevated)!important;border:1px solid var(--border-primary)!important;border-radius:8px!important;padding:1.5rem!important;width:auto!important;max-width:420px!important;box-shadow:0 10px 30px #0003!important}.register-swal-title{color:var(--text-primary)!important;font-size:1.25rem!important;font-weight:600!important;margin:0 0 .5rem!important;padding:0!important;text-align:center!important;line-height:1.4!important}.register-swal-content{color:var(--text-secondary)!important;margin:0 0 1.5rem!important;padding:0!important;font-size:1rem!important;text-align:center!important;line-height:1.5!important}.register-swal-actions{gap:.75rem!important;justify-content:center!important;margin:0!important;padding:0!important;flex-wrap:nowrap!important}.register-swal-confirm{background:var(--accent-primary)!important;color:#fff!important;border-radius:6px!important;padding:.625rem 1.5rem!important;margin:0!important;font-size:.875rem!important;font-weight:500!important;border:none!important;transition:all .2s ease!important;min-width:120px!important;height:auto!important}.register-swal-confirm:hover{background:var(--accent-hover)!important;transform:translateY(-1px)!important;box-shadow:0 4px 12px #00000026!important}.register-swal-cancel{background:var(--accent-light)!important;color:var(--text-primary)!important;border-radius:6px!important;padding:.625rem 1.5rem!important;margin:0!important;font-size:.875rem!important;font-weight:500!important;border:none!important;transition:all .2s ease!important;min-width:120px!important;height:auto!important}.register-swal-cancel:hover{background:var(--accent-light-hover)!important;transform:translateY(-1px)!important;box-shadow:0 4px 12px #0000001a!important}@media (max-width: 480px){.register-swal{margin:1rem!important;max-width:calc(100vw - 2rem)!important;padding:1.25rem!important}.register-swal-actions{flex-direction:column!important;width:100%!important}.register-swal-confirm,.register-swal-cancel{width:100%!important;min-width:auto!important}}.swal2-popup.logout-swal{background:var(--bg-elevated)!important;border:1px solid var(--border-primary)!important;border-radius:8px!important;padding:1.5rem!important;width:auto!important;max-width:400px!important}.swal2-title.logout-swal-title{color:var(--text-primary)!important;font-size:1.25rem!important;font-weight:600!important;margin:0 0 .5rem!important;padding:0!important;text-align:center!important}.swal2-html-container.logout-swal-content{color:var(--text-secondary)!important;margin:0 0 1.5rem!important;padding:0!important;font-size:1rem!important;text-align:center!important}.swal2-actions.logout-swal-actions{gap:.75rem!important;justify-content:center!important;margin:0!important;padding:0!important}.swal2-confirm.logout-swal-confirm{background:var(--accent-primary)!important;color:#fff!important;border-radius:6px!important;padding:.5rem 1rem!important;margin:0!important;font-size:.875rem!important;font-weight:500!important;border:none!important;transition:all .2s ease!important;min-width:100px!important}.swal2-confirm.logout-swal-confirm:hover{background:var(--accent-hover)!important;transform:translateY(-1px)!important}.swal2-cancel.logout-swal-cancel{background:var(--accent-light)!important;color:var(--text-primary)!important;border-radius:6px!important;padding:.5rem 1rem!important;margin:0!important;font-size:.875rem!important;font-weight:500!important;border:none!important;transition:all .2s ease!important;min-width:100px!important}.swal2-cancel.logout-swal-cancel:hover{background:var(--accent-light-hover)!important;transform:translateY(-1px)!important}.swal2-icon.swal2-question{color:var(--accent-primary)!important;border-color:var(--accent-primary)!important;margin:0 auto 1rem!important}.login-swal{background:var(--bg-elevated)!important;border:1px solid var(--border-primary)!important;border-radius:8px!important;padding:1.5rem!important;width:auto!important;max-width:420px!important;box-shadow:0 10px 30px #0003!important}.login-swal-title{color:var(--text-primary)!important;font-size:1.25rem!important;font-weight:600!important;margin:0 0 .5rem!important;padding:0!important;text-align:center!important;line-height:1.4!important}.login-swal-content{color:var(--text-secondary)!important;margin:0 0 1.5rem!important;padding:0!important;font-size:1rem!important;text-align:center!important;line-height:1.5!important}.login-swal-actions{gap:.75rem!important;justify-content:center!important;margin:0!important;padding:0!important;flex-wrap:nowrap!important}.login-swal-confirm{background:var(--accent-primary)!important;color:#fff!important;border-radius:6px!important;padding:.625rem 1.5rem!important;margin:0!important;font-size:.875rem!important;font-weight:500!important;border:none!important;transition:all .2s ease!important;min-width:120px!important;height:auto!important}.login-swal-confirm:hover{background:var(--accent-hover)!important;transform:translateY(-1px)!important;box-shadow:0 4px 12px #00000026!important}.login-swal-cancel{background:var(--accent-light)!important;color:var(--text-primary)!important;border-radius:6px!important;padding:.625rem 1.5rem!important;margin:0!important;font-size:.875rem!important;font-weight:500!important;border:none!important;transition:all .2s ease!important;min-width:120px!important;height:auto!important}.login-swal-cancel:hover{background:var(--accent-light-hover)!important;transform:translateY(-1px)!important;box-shadow:0 4px 12px #0000001a!important}.swal2-icon.swal2-success{color:var(--success-color)!important;border-color:var(--success-color)!important}.swal2-icon.swal2-error{color:var(--error-color)!important;border-color:var(--error-color)!important}.swal2-icon.swal2-warning{color:var(--warning-color)!important;border-color:var(--warning-color)!important}.swal2-icon.swal2-info{color:var(--info-color)!important;border-color:var(--info-color)!important}.swal2-noanimation{animation:none!important}@media (max-width: 480px){.login-swal{margin:1rem!important;max-width:calc(100vw - 2rem)!important;padding:1.25rem!important}.login-swal-actions{flex-direction:column!important;width:100%!important}.login-swal-confirm,.login-swal-cancel{width:100%!important;min-width:auto!important}}*{margin:0;padding:0;box-sizing:border-box}@supports (-webkit-touch-callout: none){body,#app-container{height:-webkit-fill-available}}html,body{margin:0;padding:0;width:100%;height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--bg-secondary);overflow:auto;min-height:100vh;height:100dvh;overflow:hidden;color:var(--text-primary);transition:background-color .2s ease,color .2s ease}body.landing-page{height:auto;min-height:100vh;overflow-x:hidden;overflow-y:auto}.texts,.register-link{color:var(--text-secondary)}.loading{position:relative;pointer-events:none}.loading:after{content:"";position:absolute;right:10px;top:50%;transform:translateY(-50%);width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:spin 1s linear infinite}@keyframes spin{to{transform:translateY(-50%) rotate(360deg)}}.google-icon{display:inline-block;width:18px;height:18px;background:url(https://upload.wikimedia.org/wikipedia/commons/5/53/Google_%22G%22_Logo.svg) no-repeat center;background-size:contain;margin-right:8px;vertical-align:middle}#app-container{display:flex;width:100vw;height:100vh;height:100dvh;margin:0;padding:0;background:var(--bg-primary);position:fixed;inset:0}.sidebar-logo{display:flex;align-items:center;padding:20px 15px;gap:10px;position:relative}.logo-icon{position:relative;width:36px;height:36px;display:flex;align-items:center;justify-content:center}.logo-text{font-size:1.5rem;font-weight:700;color:var(--text-primary)}[data-theme=light] .logo-icon .robot{color:#fff}.logo-text{font-size:1.2rem;font-weight:700;color:var(--text-primary);transition:opacity .2s ease}.header-minimizer i{transition:transform .3s ease}.sidebar.collapsed .header-minimizer i{transform:rotate(180deg)}.sidebar.collapsed{width:70px!important;display:flex;flex-direction:column;justify-content:space-between}.sidebar.collapsed .sidebar-header,.sidebar.collapsed .chat-history,.sidebar.collapsed .chat-item>*,.sidebar.collapsed .profile-info{display:none!important}.sidebar.collapsed .sidebar-logo{padding:20px 0;justify-content:center;left:5px}.sidebar.collapsed .logo-text{opacity:0;width:0}.sidebar.collapsed .user-profile{padding:15px 0;justify-content:center;margin:0 auto}.sidebar.collapsed .sidebar-minimizer i{transform:rotate(180deg)}.sidebar-minimizer i,.header-minimizer i{font-size:var(--icon-size)}#send-btn i{font-size:1.2em}.new-chat-btn{position:relative;display:flex;align-items:center;justify-content:center;background:var(--accent-primary);color:#fff;border:none;cursor:pointer;transition:all .2s ease;margin:10px 15px;padding:10px 15px;border-radius:8px}.new-chat-btn i{margin-right:8px;color:#fff}.sidebar.collapsed .new-chat-btn{width:40px;height:40px;margin:10px auto;padding:0;border-radius:50%}.sidebar.collapsed .new-chat-btn span{display:none}.sidebar.collapsed .new-chat-btn i{margin:0;font-size:1.2rem}.chat-header{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;background:var(--bg-secondary);position:sticky;top:0;z-index:5;border-bottom:1px solid var(--border-primary)}.header-info{display:flex;align-items:center;gap:10px}.header-info h2{font-size:1.2rem;margin:0;display:flex;align-items:center;gap:10px}.header-minimizer{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease;background:var(--accent-light);color:var(--text-primary);border:1px solid var(--accent-border)}.header-minimizer:hover{background:var(--accent-light-hover)}.header-minimizer i{font-size:1.2rem;transition:transform .2s ease}.user-profile{position:relative;cursor:pointer}.logout-dropdown{display:none;position:absolute;bottom:100%;left:15px;width:auto;min-width:160px;background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:8px;padding:8px 0;box-shadow:var(--shadow-lg);z-index:1000;margin-bottom:10px;animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}.sidebar.collapsed .logout-dropdown{left:10px;min-width:140px}.logout-item,.items{display:flex;align-items:center;gap:10px;padding:8px 16px;color:var(--text-primary);transition:all .2s ease;white-space:nowrap;cursor:pointer}.sidebar.collapsed .items,.sidebar.collapsed .logout-item{padding:8px 12px}.logout-item:hover,.items:hover{background:var(--accent-light)}.items i{color:var(--text-secondary);width:18px;text-align:center;font-size:.9rem}.logout-item i{color:var(--error);width:18px;text-align:center;font-size:.9rem}@media (max-width: 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0;padding-left:20px}.bot-message li{margin:6px 0;color:var(--text-primary)}.bot-message blockquote{border-left:3px solid var(--border-focus);margin:12px 0;padding-left:16px;color:var(--text-secondary);font-style:italic}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--scrollbar-track)}::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:3px;transition:background .2s ease}::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-thumb-hover)}::-webkit-scrollbar-corner{background:var(--scrollbar-track)}.sidebar-minimizer{display:none}@media (max-width: 768px){#app-container{flex-direction:column;height:100vh;overflow:hidden}.sidebar{width:280px;position:fixed;left:-280px;top:0;bottom:0;z-index:1000;transition:transform .3s ease;transform:translate(-100%)}.sidebar.open{transform:translate(0);left:0}.sidebar.open .sidebar-minimizer{display:flex;position:fixed;right:15px;transition:all .2s 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auto;padding:24px 20px;max-width:90%}.welcome-message h3{font-size:1.1rem}.welcome-icon{font-size:2rem}.input-container{padding:12px 16px}.input-wrapper{padding:12px 12px 48px;min-height:70px}#user-input{font-size:14px;max-height:100px}.button-group{right:8px;bottom:8px;height:32px;gap:6px}#send-btn,#mic-btn{width:32px;height:32px}.sidebar-overlay{display:block;position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;z-index:999;opacity:0;visibility:hidden;transition:all .3s ease}.sidebar.open+.sidebar-overlay{opacity:1;visibility:visible}}@media (min-width: 769px){.sidebar-minimizer{display:none!important}}@media (min-width: 769px) and (max-width: 1024px){.sidebar{width:250px}.sidebar.collapsed{width:70px!important}.message{max-width:min(80%,720px)}}@media (max-width: 480px){#chat-box{padding:16px}.user-message{max-width:90%}.bot-message,.typing-indicator{margin-left:44px;max-width:calc(92% - 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0 8px;color:var(--heading-color)}.response-h4{font-size:1rem;font-weight:600;margin:16px 0 8px;color:var(--heading-color)}.section-divider{height:1px;background-color:var(--divider-color);margin:12px 0;opacity:.5}.response-ul{margin:12px 0;padding-left:24px}.response-li{margin-bottom:6px}.response-quote{border-left:3px solid var(--quote-color);padding-left:12px;margin:12px 0;color:var(--quote-text);font-style:italic}.response-bold{font-weight:700}.response-italic{font-style:italic}.input-welcome-text{font-size:1.5rem;font-weight:600;color:var(--text-primary);text-align:center;margin:0 0 24px;padding:0 20px;line-height:1.4;opacity:.9;transition:all .3s ease}@media (max-width: 768px){.input-welcome-text{font-size:1.25rem;margin:0 0 20px;padding:0 16px}}@media (max-width: 480px){.input-welcome-text{font-size:1.1rem;margin:0 0 16px}}.chat-container.has-messages .input-welcome-text{font-size:1.1rem;margin:0 0 16px;opacity:.8}[data-theme=dark] .input-welcome-text{opacity:.95}.user-name{font-weight:600;color:var(--accent-primary);font-style:italic;opacity:.9;transition:all .3s ease}body.landing-page{overflow-x:hidden;overflow-y:auto;height:auto;min-height:100vh}.landing-nav{position:fixed;top:0;left:0;right:0;background:var(--bg-elevated);border-bottom:1px solid var(--border-primary);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:1000;transition:all .3s ease}.nav-toggle{display:none;background:var(--accent-primary);color:#fff;border:1px solid var(--accent-primary);width:40px;height:40px;border-radius:8px;align-items:center;justify-content:center}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.nav-container{max-width:1300px;margin:0 auto;padding:0 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ease;position:relative;overflow:hidden}.feature-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--gradient-main);transform:scaleX(0);transition:transform .3s ease}.feature-card:hover:before{transform:scaleX(1)}.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-xl);border-color:var(--accent-primary)}.feature-icon{width:80px;height:80px;background:var(--gradient-main);border-radius:20px;display:flex;align-items:center;justify-content:center;margin:0 auto 24px;font-size:2rem;color:#fff;box-shadow:0 20px 60px var(--accent-hover1)}.feature-title{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:16px}.feature-description{font-size:1rem;color:var(--text-secondary);line-height:1.6}.about-section{width:100%;min-width:100vw;padding:100px 0;background:var(--bg-secondary)}.about-container{max-width:1200px;margin:0 auto;padding:0 20px}.about-content{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,6vw,80px);align-items:center}.about-text .section-title{text-align:left;margin-bottom:24px}.about-description{font-size:1.2rem;color:var(--text-secondary);line-height:1.7;margin-bottom:40px}.about-features{display:grid;gap:16px}.about-feature{display:flex;align-items:center;gap:12px;font-size:1.1rem;color:var(--text-primary)}.about-feature i{color:var(--accent-primary);font-size:1.2rem}.about-image{display:flex;justify-content:center;align-items:center}.about-illustration{position:relative;width:350px;height:350px;display:flex;align-items:center;justify-content:center}.student-avatar{width:150px;height:150px;background:var(--gradient-main);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:3rem;color:#fff;box-shadow:0 20px 60px var(--accent-hover1);animation:pulse 2s ease-in-out infinite}.learning-elements{position:absolute;width:100%;height:100%}.element{position:absolute;width:60px;height:60px;background:var(--bg-elevated);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:var(--accent-primary);box-shadow:var(--shadow-lg);animation:orbit 6s linear infinite}.element-1{top:20%;left:20%;animation-delay:0s}.element-2{top:20%;right:20%;animation-delay:2s}.element-3{bottom:20%;left:50%;transform:translate(-50%);animation-delay:4s}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes orbit{0%{transform:rotate(0) translate(100px) rotate(0)}to{transform:rotate(360deg) translate(100px) rotate(-360deg)}}.cta-section{width:100%;min-width:100vw;padding:100px 0;background:var(--gradient-main);color:var(--text-primary1);text-align:center}.cta-container{max-width:800px;margin:0 auto;padding:0 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var(--border-primary);text-align:center}.footer-copyright{color:var(--text-muted);font-size:.9rem}.footer-legal{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:16px}.footer-legal-link{background:none;border:none;color:var(--text-secondary);font-size:.9rem;cursor:pointer;transition:color .2s ease;padding:4px 8px;border-radius:4px;text-decoration:none}.footer-legal-link:hover{color:var(--accent-primary);background:var(--bg-hover)}.footer-separator{color:var(--text-muted);font-size:.9rem}@media (min-width: 1920px){.hero-container{max-width:1400px;gap:80px}.hero-title{font-size:4rem}.hero-subtitle{font-size:1.4rem}.features-container,.about-container,.cta-container,.footer-container{max-width:1400px}.section-title{font-size:3rem}.section-subtitle{font-size:1.3rem}.features-grid{grid-template-columns:repeat(3,1fr);gap:50px}.feature-card{padding:50px 40px}.hero-illustration{width:500px;height:500px}.hero-logo-image{width:400px;height:400px}}@media (min-width: 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ease!important}.user-message{background:var(--bg-input)!important;border-color:var(--border-primary)!important;transition:background-color .15s ease,border-color .15s ease!important}.bot-message{background:transparent!important;transition:none!important}.code-block{background:var(--code-bg)!important;border-color:var(--code-border)!important;transition:background-color .15s ease,border-color .15s ease!important}.code-header{background:var(--code-header-bg)!important;color:var(--code-header-text)!important;border-color:var(--code-border)!important;transition:background-color .15s ease,color .15s ease,border-color .15s ease!important}[data-theme] *{transition-duration:.15s!important}.theme-changing{transition:none!important}