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var(--transition-slow);width:100%}.skip-intro-button:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}.skip-intro-button:hover:before{left:100%}.tutor-free-mode{display:flex;flex:1 1;flex-direction:column;gap:var(--space-lg);overflow:hidden}.topic-selection{animation:fadeInUp .6s var(--transition-bounce);text-align:center}.topic-selection h3{-webkit-text-fill-color:transparent;background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);background-clip:text;-webkit-background-clip:text;font-size:1.5rem;font-weight:700;margin-bottom:var(--space-lg);position:relative}.topic-selection h3:before{content:"💡";font-size:1.3rem;margin-right:var(--space-sm)}.topic-grid{grid-gap:var(--space-md);background:hsla(0,0%,100%,.02);border-radius:var(--radius-lg);display:grid;gap:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-top:var(--space-md);max-height:40vh;overflow-y:auto;padding:var(--space-sm)}.topic-grid::-webkit-scrollbar{width:8px}.topic-grid::-webkit-scrollbar-track{background:hsla(0,0%,100%,.05);border-radius:var(--radius-full)}.topic-grid::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);border-radius:var(--radius-full)}.topic-card{align-items:center;animation:fadeInUp .6s var(--transition-bounce);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);cursor:pointer;display:flex;flex-direction:column;gap:var(--space-sm);justify-content:center;min-height:120px;overflow:hidden;padding:var(--space-lg);position:relative;text-align:center;transition:all var(--transition-normal)}.topic-card:before{background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);content:"";height:2px;left:0;opacity:0;position:absolute;right:0;top:0;transition:opacity var(--transition-normal)}.topic-card:hover{border-color:#9b59b6;border-color:var(--tutor-primary);box-shadow:var(--shadow-lg),0 0 30px rgba(155,89,182,.4);box-shadow:var(--shadow-lg),var(--tutor-shadow-glow);transform:translateY(-5px) scale(1.02)}.topic-card:hover:before{opacity:1}.topic-icon{font-size:2.5rem;margin-bottom:var(--space-sm);transition:transform var(--transition-normal)}.topic-card:hover .topic-icon{transform:scale(1.1)}.topic-name{color:var(--text-primary);font-size:1rem;font-weight:700;margin-bottom:var(--space-xs)}.topic-description{color:var(--text-muted);font-size:.85rem;line-height:1.4}.custom-topic{border-color:#9b59b6;border-color:var(--tutor-primary);border-style:dashed}.custom-topic:hover{border-style:solid}.custom-topic-input{animation:slideInUp .5s var(--transition-bounce);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-lg);margin-bottom:var(--space-lg);padding:var(--space-lg)}.custom-topic-input input{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:hsla(0,0%,100%,.08);border:2px solid hsla(0,0%,100%,.1);border-radius:var(--radius-md);color:var(--text-primary);font-size:1rem;font-weight:500;margin-bottom:var(--space-md);padding:var(--space-md);transition:all var(--transition-normal);width:100%}.custom-topic-input input:focus{border-color:#9b59b6;border-color:var(--tutor-primary);box-shadow:0 0 0 4px rgba(155,89,182,.2),0 0 30px rgba(155,89,182,.4);box-shadow:0 0 0 4px rgba(155,89,182,.2),var(--tutor-shadow-glow);outline:none;transform:translateY(-2px)}.custom-topic-input input::placeholder{color:var(--text-muted)}.custom-topic-buttons{display:flex;gap:var(--space-md);justify-content:center}.custom-topic-buttons button{background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);border:none;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);color:#fff;cursor:pointer;flex:1 1;font-size:.9rem;font-weight:600;max-width:120px;padding:var(--space-sm) var(--space-lg);transition:all var(--transition-normal)}.custom-topic-buttons button:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.custom-topic-buttons button:last-child{background:linear-gradient(135deg,#e74c3c,#c0392b);background:var(--tutor-accent-gradient)}.chat-area{animation:fadeInUp .6s var(--transition-bounce) .3s both;-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);flex:1 1;flex-direction:column}.chat-area,.selected-topic{display:flex;overflow:hidden;position:relative}.selected-topic{align-items:center;background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);border-bottom:1px solid var(--glass-border);color:#fff;padding:var(--space-md)}.selected-topic:before{animation:shimmer 3s infinite;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.2),transparent);content:"";height:100%;left:-100%;position:absolute;top:0;width:100%}.selected-topic .topic-icon{font-size:1.2rem;margin-bottom:0;margin-right:var(--space-sm)}.selected-topic .topic-name{color:#fff;flex:1 1;font-size:1rem;font-weight:700;margin-bottom:0}.change-topic-button{background:hsla(0,0%,100%,.2);border:1px solid hsla(0,0%,100%,.3);border-radius:var(--radius-md);color:#fff;cursor:pointer;font-size:.8rem;font-weight:600;letter-spacing:.3px;padding:var(--space-xs) var(--space-sm);text-transform:uppercase;transition:all var(--transition-normal)}.change-topic-button:hover{background:hsla(0,0%,100%,.3);transform:translateY(-1px)}.chat-container{-webkit-overflow-scrolling:touch;background:hsla(0,0%,100%,.02);display:flex;flex:1 1;flex-direction:column;gap:var(--space-md);overflow-y:auto;padding:var(--space-lg)}.chat-container::-webkit-scrollbar{width:6px}.chat-container::-webkit-scrollbar-track{background:hsla(0,0%,100%,.05);border-radius:var(--radius-full)}.chat-container::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);border-radius:var(--radius-full)}.chat-container::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#3498db,#2980b9);background:var(--tutor-secondary-gradient)}.chat-message{align-items:flex-start;animation:slideInUp .3s ease;display:flex;gap:var(--space-sm);margin-bottom:var(--space-md)}.user-message{flex-direction:row-reverse;justify-content:flex-end}.assistant-message{justify-content:flex-start}.system-message{justify-content:center;margin:var(--space-lg) 0}.message-avatar{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:2px solid var(--glass-border);border-radius:var(--radius-full);box-shadow:var(--shadow-sm);display:flex;flex-shrink:0;font-size:1.2rem;height:40px;justify-content:center;width:40px}.user-message .message-avatar{background:rgba(52,152,219,.15);background:var(--chat-user-bg);border-color:rgba(52,152,219,.3)}.assistant-message .message-avatar{background:rgba(155,89,182,.15);background:var(--chat-assistant-bg);border-color:rgba(155,89,182,.3)}.message-content{-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-lg);box-shadow:0 4px 15px rgba(0,0,0,.1);box-shadow:var(--tutor-shadow-message);max-width:75%;padding:var(--space-md);position:relative;transition:all var(--transition-normal);word-break:break-word}.message-content:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.user-message .message-content{background:rgba(52,152,219,.15);background:var(--chat-user-bg);border-bottom-right-radius:var(--radius-sm);border-color:rgba(52,152,219,.3)}.user-message .message-content:after{border:8px solid transparent;border-bottom:0;border-left:8px solid var(--chat-user-bg);border-right:0;bottom:0;content:"";height:0;position:absolute;right:-8px;width:0}.assistant-message .message-content{background:rgba(155,89,182,.15);background:var(--chat-assistant-bg);border-bottom-left-radius:var(--radius-sm);border-color:rgba(155,89,182,.3)}.assistant-message .message-content:after{border:8px solid transparent;border-bottom:0;border-left:0;border-right:8px solid var(--chat-assistant-bg);bottom:0;content:"";height:0;left:-8px;position:absolute;width:0}.system-message .message-content{background:rgba(46,204,113,.1);background:var(--chat-system-bg);border-color:rgba(46,204,113,.3);border-radius:var(--radius-lg);color:var(--text-muted);font-size:.85rem;max-width:60%;padding:var(--space-sm) var(--space-md);text-align:center}.message-text{color:var(--text-primary);font-size:.95rem;line-height:1.6;margin:0}.message-time{color:var(--text-muted);font-size:.7rem;margin-top:var(--space-xs);text-align:right}.user-message .message-time{text-align:left}.message-actions{display:flex;gap:var(--space-xs);justify-content:flex-end;margin-top:var(--space-sm)}.feedback-button,.speak-button{align-items:center;background:none;border:none;border-radius:var(--radius-sm);color:var(--text-muted);cursor:pointer;display:flex;font-size:1rem;height:28px;justify-content:center;padding:var(--space-xs);transition:all var(--transition-normal);width:28px}.feedback-button:hover,.speak-button:hover{background:rgba(155,89,182,.1);color:#9b59b6;color:var(--tutor-primary);transform:scale(1.1)}.speak-button:disabled{color:hsla(0,0%,100%,.3);cursor:not-allowed;transform:none}.feedback-button:hover{background:rgba(231,76,60,.1);color:#e74c3c;color:var(--tutor-accent)}.typing-indicator{animation:slideInUp .3s ease;border:1px solid rgba(155,89,182,.3);border-radius:var(--radius-lg);box-shadow:0 4px 15px rgba(0,0,0,.1);box-shadow:var(--tutor-shadow-message);margin-bottom:var(--space-md);padding:var(--space-md);width:fit-content}.typing-avatar,.typing-indicator{align-items:center;background:rgba(155,89,182,.15);background:var(--chat-assistant-bg);display:flex}.typing-avatar{border:2px solid rgba(155,89,182,.3);border-radius:var(--radius-full);font-size:1rem;height:32px;justify-content:center;width:32px}.typing-avatar,.typing-name{margin-right:var(--space-sm)}.typing-name{color:var(--text-muted);font-size:.8rem;font-weight:600}.typing-dots{display:flex;gap:var(--space-xs)}.typing-dot{animation:typingAnimation 1.5s ease-in-out infinite;background:#9b59b6;background:var(--tutor-primary);border-radius:var(--radius-full);height:8px;width:8px}.typing-dot:nth-child(2){animation-delay:.3s}.typing-dot:nth-child(3){animation-delay:.6s}@keyframes typingAnimation{0%,to{opacity:.5;transform:translateY(0)}50%{opacity:1;transform:translateY(-6px)}}.input-area{grid-gap:var(--space-sm);align-items:flex-end;-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border-top:1px solid var(--glass-border);display:grid;gap:var(--space-sm);grid-template-columns:auto 1fr auto;padding:var(--space-lg);position:relative}.input-area:before{background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);content:"";height:1px;left:0;opacity:.5;position:absolute;right:0;top:0}.voice-input-button{align-items:center;-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:2px solid var(--glass-border);border-radius:var(--radius-full);box-shadow:var(--shadow-sm);color:var(--text-primary);cursor:pointer;display:flex;font-size:1.3rem;height:48px;justify-content:center;overflow:hidden;position:relative;transition:all var(--transition-normal);width:48px}.voice-input-button:before{background:linear-gradient(135deg,#e74c3c,#c0392b);background:var(--tutor-accent-gradient);border-radius:var(--radius-full);bottom:0;content:"";left:0;opacity:0;position:absolute;right:0;top:0;transition:opacity var(--transition-normal)}.voice-input-button:hover{border-color:#9b59b6;border-color:var(--tutor-primary);box-shadow:var(--shadow-md),0 0 30px rgba(155,89,182,.4);box-shadow:var(--shadow-md),var(--tutor-shadow-glow);transform:translateY(-2px) scale(1.05)}.voice-input-button.listening{animation:pulseRecord 1.5s infinite;background:linear-gradient(135deg,#e74c3c,#c0392b);background:var(--tutor-accent-gradient);border-color:#e74c3c;border-color:var(--tutor-accent);box-shadow:var(--shadow-lg),0 0 20px rgba(231,76,60,.3);box-shadow:var(--shadow-lg),var(--tutor-shadow-accent)}.voice-input-button.listening:before{opacity:.2}.message-input{-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:hsla(0,0%,100%,.08);background:var(--chat-input-bg);border:2px solid var(--glass-border);border-radius:var(--radius-lg);color:var(--text-primary);font-family:inherit;font-size:1rem;font-weight:500;line-height:1.5;max-height:120px;min-height:48px;padding:var(--space-md);resize:none;transition:all var(--transition-normal)}.message-input:focus{background:hsla(0,0%,100%,.12);border-color:#9b59b6;border-color:var(--tutor-primary);box-shadow:0 0 0 4px rgba(155,89,182,.2),0 0 30px rgba(155,89,182,.4);box-shadow:0 0 0 4px rgba(155,89,182,.2),var(--tutor-shadow-glow);outline:none;transform:translateY(-2px)}.message-input::placeholder{color:var(--text-muted);font-weight:400}.send-button{align-items:center;background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);border:none;border-radius:var(--radius-full);box-shadow:var(--shadow-md);color:#fff;cursor:pointer;display:flex;font-size:1.3rem;height:48px;justify-content:center;overflow:hidden;position:relative;transition:all var(--transition-normal);width:48px}.send-button:before{background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.3),transparent);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left var(--transition-slow);width:100%}.send-button:after{content:"➤";position:relative;transition:transform var(--transition-normal);z-index:2}.send-button:hover{box-shadow:var(--shadow-lg),0 0 30px rgba(155,89,182,.4);box-shadow:var(--shadow-lg),var(--tutor-shadow-glow);transform:translateY(-3px) scale(1.05)}.send-button:hover:before{left:100%}.send-button:hover:after{transform:translateX(2px)}.send-button:disabled{background:rgba(155,89,182,.3);box-shadow:var(--shadow-sm);cursor:not-allowed;transform:none}.send-button:disabled:before{display:none}.feedback-container{animation:slideInUp .5s var(--transition-bounce);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid rgba(231,76,60,.3);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);margin-top:var(--space-md);overflow:hidden}.feedback-header{align-items:center;background:linear-gradient(135deg,#e74c3c,#c0392b);background:var(--tutor-accent-gradient);color:#fff;display:flex;justify-content:space-between;overflow:hidden;padding:var(--space-md);position:relative}.feedback-header:before{animation:shimmer 3s infinite;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.2),transparent);content:"";height:100%;left:-100%;position:absolute;top:0;width:100%}.feedback-header h4{align-items:center;display:flex;font-size:1.1rem;font-weight:700;gap:var(--space-sm);margin:0}.feedback-header h4:before{content:"📝";font-size:1rem}.close-feedback-button{align-items:center;background:hsla(0,0%,100%,.2);border:1px solid hsla(0,0%,100%,.3);border-radius:var(--radius-full);color:#fff;cursor:pointer;display:flex;font-size:1.2rem;height:32px;justify-content:center;padding:var(--space-xs);transition:all var(--transition-normal);width:32px}.close-feedback-button:hover{background:hsla(0,0%,100%,.3);transform:rotate(90deg) scale(1.1)}.feedback-content{background:hsla(0,0%,100%,.02);color:var(--text-secondary);font-size:.95rem;line-height:1.7;padding:var(--space-lg);white-space:pre-wrap}.scroll-bottom-button{align-items:center;animation:bounce 2s infinite alternate;background:linear-gradient(135deg,#9b59b6,#8e44ad);background:var(--tutor-gradient);border:none;border-radius:var(--radius-full);bottom:100px;box-shadow:var(--shadow-lg);color:#fff;cursor:pointer;display:flex;font-size:1.5rem;height:50px;justify-content:center;position:fixed;right:30px;transition:all var(--transition-normal);width:50px;z-index:var(--z-menu)}.scroll-bottom-button:hover{box-shadow:var(--shadow-lg),0 0 30px rgba(155,89,182,.4);box-shadow:var(--shadow-lg),var(--tutor-shadow-glow);transform:scale(1.1)}.input-language-indicator{animation:slideInUp .3s ease;-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);color:#f39c12;color:var(--tutor-warning);font-size:.8rem;font-weight:600;left:60px;padding:var(--space-xs) var(--space-sm);position:absolute;top:-30px}.detected-language{color:#2ecc71;color:var(--tutor-success)}.feedback-modal{align-items:center;animation:fadeIn .3s ease;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:var(--bg-overlay);display:flex;height:100%;justify-content:center;left:0;position:fixed;top:0;width:100%;z-index:var(--z-modal)}.feedback-modal-content{animation:slideUp .5s var(--transition-bounce);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);max-height:85vh;max-width:700px;overflow-y:auto;padding:var(--space-xl);position:relative;width:90%}.feedback-modal-content:before{background:linear-gradient(135deg,#e74c3c,#c0392b);background:var(--tutor-accent-gradient);border-radius:var(--radius-xl) var(--radius-xl) 0 0;content:"";height:4px;left:0;position:absolute;right:0;top:0}.feedback-modal-header{align-items:center;border-bottom:1px solid var(--glass-border);display:flex;justify-content:space-between;margin-bottom:var(--space-lg);padding-bottom:var(--space-md)}.feedback-modal-header h3{-webkit-text-fill-color:transparent;background:linear-gradient(135deg,#e74c3c,#c0392b);background:var(--tutor-accent-gradient);background-clip:text;-webkit-background-clip:text;font-size:1.5rem;font-weight:700;margin:0}.feedback-language-selector{align-items:center;background:hsla(0,0%,100%,.05);border:1px solid var(--glass-border);border-radius:var(--radius-lg);display:flex;gap:var(--space-md);margin-bottom:var(--space-lg);padding:var(--space-md)}.feedback-language-selector label{color:var(--text-primary);font-weight:600;white-space:nowrap}.feedback-language-selector select{-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-primary);flex:1 1;font-size:.9rem;padding:var(--space-sm) var(--space-md);transition:all var(--transition-normal)}.feedback-language-selector select:focus{border-color:#9b59b6;border-color:var(--tutor-primary);box-shadow:0 0 0 2px rgba(155,89,182,.2);outline:none}.feedback-message-preview{background:rgba(52,152,219,.1);border:1px solid rgba(52,152,219,.3);border-radius:var(--radius-lg);margin-bottom:var(--space-lg);overflow:hidden;padding:var(--space-lg);position:relative}.feedback-message-preview:before{background:linear-gradient(135deg,#3498db,#2980b9);background:var(--tutor-secondary-gradient);content:"";height:2px;left:0;position:absolute;right:0;top:0}.feedback-preview-label{align-items:center;color:var(--text-primary);display:flex;font-size:.9rem;font-weight:700;gap:var(--space-sm);margin-bottom:var(--space-sm)}.feedback-preview-label:before{content:"💬";font-size:1rem}.feedback-preview-text{color:var(--text-secondary);font-size:.95rem;line-height:1.6}.generate-feedback-button,.regenerate-feedback-button{background:linear-gradient(135deg,#e74c3c,#c0392b);background:var(--tutor-accent-gradient);border:none;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);color:#fff;cursor:pointer;font-size:1rem;font-weight:600;letter-spacing:.5px;overflow:hidden;position:relative;text-transform:uppercase;transition:all 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