.chatbot-subject-container{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;border:1px solid #e1e1e1;border-radius:12px;background:#fff;box-shadow:0 4px 20px rgba(0,0,0,.1);display:flex;flex-direction:column;overflow:hidden}.chatbot-subject-header{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;padding:20px;display:flex;justify-content:space-between;align-items:center}.chatbot-subject-header h3{margin:0;font-size:20px;font-weight:600}.chatbot-subject-status{display:flex;align-items:center;gap:8px;font-size:14px;opacity:.9}.status-dot{width:8px;height:8px;border-radius:50%;background:#4ade80}.status-dot.online{background:#4ade80;animation:pulse 2s infinite}@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}.chatbot-user-info{padding:15px 20px;background:#f8fafc;border-bottom:1px solid #e1e1e1}.user-info-fields{display:flex;gap:15px;align-items:end}.user-info-fields .form-group{flex:1;margin-bottom:0}.user-info-fields label{display:block;margin-bottom:5px;font-size:12px;font-weight:600;color:#64748b}.user-info-fields input{width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:6px;font-size:14px;transition:all .2s ease}.user-info-fields input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,.1)}.user-info-fields input:invalid{border-color:#ef4444}.chatbot-subject-messages{flex:1;padding:20px;overflow-y:auto;background:#f8fafc;max-height:calc(100% - 200px);display:flex;flex-direction:column;gap:16px}.chatbot-message{display:flex;align-items:flex-start;gap:12px;max-width:85%}.chatbot-message.user{align-self:flex-end;flex-direction:row-reverse}.chatbot-message.bot{align-self:flex-start}.chatbot-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0;margin-top:4px}.chatbot-message.user .chatbot-avatar{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.chatbot-message.bot .chatbot-avatar{background:linear-gradient(135deg,#10b981,#059669);color:#fff}.chatbot-message-content{padding:12px 16px;border-radius:18px;line-height:1.5;word-wrap:break-word;box-shadow:0 2px 8px rgba(0,0,0,.1)}.chatbot-message.user .chatbot-message-content{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-bottom-right-radius:6px}.chatbot-message.bot .chatbot-message-content{background:#fff;color:#1f2937;border:1px solid #e5e7eb;border-bottom-left-radius:6px}.chatbot-message-meta{font-size:11px;opacity:.7;margin-top:8px;display:flex;justify-content:space-between;align-items:center;gap:12px}.chatbot-subject-input-area{padding:20px;border-top:1px solid #e5e7eb;background:#fff}.chatbot-input-wrapper{display:flex;gap:12px;align-items:flex-end;background:#f8fafc;border:1px solid #e5e7eb;border-radius:24px;padding:8px;transition:all .2s ease}.chatbot-input-wrapper:focus-within{border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,.1)}.chatbot-input{flex:1;border:none;background:0 0;padding:8px 16px;font-size:14px;resize:none;min-height:24px;max-height:120px;outline:none;line-height:1.5}.chatbot-send-btn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:50%;width:40px;height:40px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;flex-shrink:0}.chatbot-send-btn:hover{transform:scale(1.05);box-shadow:0 4px 12px rgba(102,126,234,.3)}.chatbot-send-btn:disabled{background:#9ca3af;cursor:not-allowed;transform:none;box-shadow:none}.chatbot-send-btn svg{width:18px;height:18px;fill:currentColor}.chatbot-typing{display:flex;align-items:center;gap:8px;padding:12px 16px;color:#6b7280;font-style:italic}.chatbot-typing-dots{display:flex;gap:4px}.chatbot-typing-dot{width:6px;height:6px;border-radius:50%;background:#9ca3af;animation:chatbot-typing 1.4s infinite ease-in-out}.chatbot-typing-dot:nth-child(1){animation-delay:-.32s}.chatbot-typing-dot:nth-child(2){animation-delay:-.16s}@keyframes chatbot-typing{0%,80%,100%{transform:scale(.8);opacity:.5}40%{transform:scale(1);opacity:1}}.chatbot-subject-error{background:#fef2f2;color:#dc2626;padding:12px 16px;border-radius:8px;margin:10px 0;border-left:4px solid #ef4444;font-size:14px}.chatbot-subject-warning{background:#fffbeb;color:#92400e;padding:12px 16px;border-radius:8px;margin:10px 0;border-left:4px solid #f59e0b;font-size:14px}.chatbot-teacher-upload-container{max-width:900px;margin:0 auto;padding:20px}.chatbot-teacher-upload-header{text-align:center;margin-bottom:30px;padding:30px;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,.1)}.chatbot-teacher-upload-header h3{margin:0 0 10px;font-size:28px;font-weight:700}.chatbot-teacher-upload-header p{margin:0;opacity:.9;font-size:16px}.chatbot-teacher-upload-form{background:#fff;padding:30px;border-radius:12px;border:1px solid #e5e7eb;box-shadow:0 2px 10px rgba(0,0,0,.05);margin-bottom:30px}.form-row{display:flex;gap:20px;margin-bottom:20px}.form-group{flex:1;margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:#374151;font-size:14px}.form-group input[type=text],.form-group input[type=email],.form-group select,.form-group textarea{width:100%;padding:12px 16px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;transition:all .2s ease;font-family:inherit}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,.1)}.form-group textarea{resize:vertical;min-height:300px;line-height:1.6;font-family:'Courier New',monospace}.content-info{margin-top:8px;font-size:12px;color:#6b7280;display:flex;justify-content:space-between;align-items:center}.content-info.warning{color:#dc2626}.recommendation{color:#9ca3af;font-style:italic}.file-upload-area{position:relative;border:2px dashed #d1d5db;border-radius:8px;padding:40px 20px;text-align:center;transition:all .3s ease;cursor:pointer;background:#fafafa}.file-upload-area:hover{border-color:#667eea;background:#f0f4ff}.file-upload-area.dragover{border-color:#667eea;background:#e0e7ff;transform:scale(1.02)}.file-input{position:absolute;width:100%;height:100%;top:0;left:0;opacity:0;cursor:pointer}.upload-placeholder .upload-icon{font-size:48px;margin-bottom:12px;display:block;opacity:.7}.upload-placeholder p{margin:0 0 8px;color:#6b7280;font-size:16px}.upload-placeholder small{color:#9ca3af}.form-actions{text-align:center;margin-top:30px}.submit-button{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:14px 32px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px rgba(102,126,234,.3)}.submit-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(102,126,234,.4)}.submit-button:disabled{background:#9ca3af;cursor:not-allowed;transform:none;box-shadow:none}.recent-textbooks{background:#fff;padding:24px;border-radius:12px;border:1px solid #e5e7eb;box-shadow:0 2px 10px rgba(0,0,0,.05)}.recent-textbooks h4{margin:0 0 20px;color:#374151;font-size:18px}.textbooks-list{display:flex;flex-direction:column;gap:12px}.textbook-item{padding:16px;border:1px solid #e5e7eb;border-radius:8px;transition:all .2s ease}.textbook-item:hover{border-color:#667eea;box-shadow:0 2px 8px rgba(102,126,234,.1)}.textbook-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.subject-badge{background:#667eea;color:#fff;padding:4px 8px;border-radius:12px;font-size:12px;font-weight:600}.textbook-meta{display:flex;gap:16px;font-size:12px;color:#6b7280}.status{padding:2px 8px;border-radius:8px;font-size:11px;font-weight:600}.status.active{background:#d1fae5;color:#065f46}.status.inactive{background:#fef3c7;color:#92400e}.form-message{margin-top:16px;padding:12px 16px;border-radius:8px;text-align:center;font-weight:500}.form-message.success{background:#d1fae5;color:#065f46;border:1px solid #a7f3d0}.form-message.error{background:#fef2f2;color:#dc2626;border:1px solid #fecaca}@media (max-width:768px){.form-row{flex-direction:column;gap:0}.chatbot-message{max-width:90%}.user-info-fields{flex-direction:column;gap:12px}.chatbot-teacher-upload-container{padding:10px}.chatbot-teacher-upload-form{padding:20px}.textbook-info{flex-direction:column;align-items:flex-start;gap:8px}.textbook-meta{flex-wrap:wrap}}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}.loading-spinner{display:inline-block;animation:spin 1s linear infinite}.math-content mjx-container{display:inline-block !important;margin:0 2px !important;vertical-align:middle !important;line-height:normal !important}.math-content mjx-container[jax=CHTML][display=true]{display:block !important;margin:10px 0 !important;text-align:center !important;overflow-x:auto !important;overflow-y:hidden !important}.chatbot-message-content.math-content,.ms-chatbot-message-bubble.math-content,.message-content.math-content{line-height:1.6 !important;overflow-wrap:break-word !important}.chatbot-message.user .math-content mjx-container,.ms-chatbot-message.user .math-content mjx-container,.user-message .math-content mjx-container{color:inherit !important}.chatbot-message.bot .math-content mjx-container,.ms-chatbot-message.bot .math-content mjx-container,.bot-message .math-content mjx-container{color:inherit !important}.math-content mjx-container mjx-math{font-size:inherit !important}.math-content{min-height:1em}.math-content mjx-container{max-width:100%}.math-content mjx-container[jax=CHTML][display=true]{max-width:100%;overflow-x:auto}