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h3{font-size:14px;font-weight:600;margin-bottom:2px;color:var(--charcoal)}.student-email{color:var(--gray);font-size:12px;margin-bottom:5px}.student-stats{display:flex;gap:8px;font-size:12px}.streak{color:var(--coral);font-weight:600}.lessons-count{color:var(--gray)}.student-card-actions{display:flex;flex-direction:column;gap:6px;flex-shrink:0}.student-card-actions button{background:var(--cream);border:1px solid var(--border);color:var(--charcoal);padding:6px 12px;border-radius:6px;cursor:pointer;transition:all .15s;font-size:12px;font-weight:500;white-space:nowrap;font-family:inherit}.student-card-actions button:hover{background:var(--cream-dark);border-color:var(--gray)}.student-card-actions .archive-button{background:var(--coral-light);border-color:#f5c9be;color:var(--coral)}.student-card-actions .archive-button:hover{background:#f0c8bf}.student-card.inactive{opacity:.55}.toggle-archive-button{margin-top:1.5rem;background:none;border:1px solid var(--border);color:var(--gray);padding:9px 16px;border-radius:var(--radius-sm);cursor:pointer;font-size:14px;transition:all .15s;font-family:inherit}.toggle-archive-button:hover{background:var(--cream-dark);color:var(--charcoal)}.empty-state{text-align:center;padding:56px 20px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.empty-icon{font-size:44px;margin-bottom:14px}.empty-state h3{font-size:18px;margin-bottom:8px;color:var(--charcoal);font-weight:700}.empty-state p{color:var(--gray);font-size:14px;max-width:380px;margin:0 auto 22px;line-height:1.6}.modal-overlay{position:fixed;inset:0;background:#1c2b2a80;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 32px;width:90%;max-width:500px;box-shadow:var(--shadow-md)}.modal input,.modal select{width:100%;padding:9px 12px;background:var(--cream);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--charcoal);font-size:14px;margin-top:5px;font-family:inherit;transition:border-color .2s}.modal input:focus,.modal select:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px var(--teal-light)}.modal label{text-align:left;display:block;font-size:12px;font-weight:600;color:var(--gray);text-transform:uppercase;letter-spacing:.05em}.lessons-subsection{margin-top:2rem;width:100%}.lessons-subsection h3{margin-bottom:1rem;padding-bottom:.5rem;border-bottom:1px solid var(--border);color:var(--charcoal);font-size:15px}.list-card{list-style:none;padding:0;display:flex;flex-direction:column;gap:.6rem}.list-card li{background-color:var(--white);border:1px solid var(--border);padding:.85rem 1rem;border-radius:var(--radius-sm);display:flex;justify-content:space-between;align-items:center;box-shadow:var(--shadow-sm)}.list-card small{color:var(--gray);font-size:12px}@media (max-width: 768px){.teacher-header{padding:0 16px;height:56px}.stat-pill,.dashboard-sidebar{display:none}.dashboard-main{padding:20px 16px}}.report-section{display:flex;flex-direction:column;gap:20px}.report-section h2{font-size:1.1rem;font-weight:600;color:var(--charcoal);margin:0}.report-selector{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.report-selector label{font-size:.875rem;font-weight:500;color:var(--gray);white-space:nowrap}.report-selector select{padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--white);color:var(--charcoal);font-size:.875rem;min-width:220px;cursor:pointer}.report-selector select:focus{outline:2px solid var(--teal);border-color:var(--teal)}.report-stat-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}.report-stat-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:20px 16px;text-align:center;box-shadow:var(--shadow-sm)}.report-stat-value{font-size:2rem;font-weight:700;color:var(--teal);line-height:1;margin-bottom:6px}.report-stat-label{font-size:.75rem;font-weight:500;color:var(--gray);text-transform:uppercase;letter-spacing:.04em}.report-chart-container{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:20px;box-shadow:var(--shadow-sm)}.report-chart-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:12px}.report-chart-header h4{font-size:.9rem;font-weight:600;color:var(--charcoal);margin:0}.report-period-btns{display:flex;gap:6px}.report-period-btn{padding:5px 14px;border:1px solid var(--border);border-radius:20px;background:var(--white);color:var(--gray);font-size:.8rem;font-weight:500;cursor:pointer;transition:all .15s}.report-period-btn:hover{border-color:var(--teal);color:var(--charcoal)}.report-period-btn.active{background:var(--teal-light);border-color:var(--teal);color:var(--teal);font-weight:600}.attendance-period-filter{display:flex;gap:6px}.period-btn{padding:5px 14px;border:1px solid var(--border);border-radius:20px;background:var(--white);color:var(--gray);font-size:.8rem;font-weight:500;cursor:pointer;transition:all .15s}.period-btn:hover{border-color:var(--teal);color:var(--charcoal)}.period-btn.active{background:var(--teal-light);border-color:var(--teal);color:var(--teal);font-weight:600}.attendance-rate-badge{font-size:1.1rem;font-weight:700;padding:10px 16px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-sm);display:inline-block;box-shadow:var(--shadow-sm)}.attendance-table{width:100%;border-collapse:collapse;font-size:.875rem;background:var(--white);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm)}.attendance-table th{background:var(--cream-dark);color:var(--gray);font-weight:600;font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;padding:10px 14px;text-align:left;border-bottom:1px solid var(--border)}.attendance-table td{padding:10px 14px;border-bottom:1px solid var(--border);color:var(--charcoal)}.attendance-table tr:last-child td{border-bottom:none}.attendance-table tr:hover td{background:var(--cream)}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#1c2b2a80;display:flex;align-items:center;justify-content:center;z-index:1000}.chatbot-container{width:90%;max-width:500px;height:80vh;max-height:700px;background-color:var(--white);border:1px solid var(--border);border-radius:16px;box-shadow:0 16px 48px #1c2b2a1f;display:flex;flex-direction:column;overflow:hidden}.chatbot-header{padding:1rem 1.5rem;border-bottom:1px solid var(--border);position:relative;flex-shrink:0;background:var(--cream)}.chatbot-header h2{margin:0;color:var(--charcoal);font-size:1rem;font-weight:700}.chatbot-header p{margin:4px 0 0;color:var(--gray);font-size:.85rem}.close-button{position:absolute;top:10px;right:15px;background:none;border:none;color:var(--gray);font-size:1.8rem;cursor:pointer;line-height:1;transition:color .2s}.close-button:hover{color:var(--charcoal)}.chatbot-body{padding:1.5rem;display:flex;flex-direction:column;gap:1rem;flex-grow:1;overflow-y:auto;min-height:0;background:var(--cream)}.chat-bubble-wrapper{display:flex;width:100%}.chat-bubble{max-width:80%;padding:.75rem 1rem;border-radius:16px;line-height:1.5}.chat-bubble p{margin:0;white-space:pre-wrap}.sender-label{display:block;font-size:.72rem;font-weight:700;margin-bottom:4px;opacity:.7;text-transform:uppercase;letter-spacing:.05em}.chat-bubble-wrapper.ai{justify-content:flex-start}.chat-bubble-wrapper.ai .chat-bubble{background-color:var(--white);color:var(--charcoal);border:1px solid var(--border);border-bottom-left-radius:4px}.chat-bubble-wrapper.user{justify-content:flex-end}.chat-bubble-wrapper.user .chat-bubble{background-color:var(--teal);color:var(--white);border-bottom-right-radius:4px}.chatbot-form{display:flex;padding:1rem;border-top:1px solid var(--border);gap:8px;flex-shrink:0;background:var(--white)}.chatbot-form input{flex-grow:1;padding:.7rem 1rem;border:1px solid var(--border);background-color:var(--cream);color:var(--charcoal);border-radius:20px;font-size:14px;font-family:inherit;transition:border-color .2s}.chatbot-form input:focus{outline:none;border-color:var(--teal)}.chatbot-form button{padding:.7rem 1.2rem;border-radius:20px;border:none;background-color:var(--teal);color:var(--white);cursor:pointer;font-weight:600;font-family:inherit;transition:background .2s}.chatbot-form button:hover:not(:disabled){background-color:var(--teal-mid)}.chatbot-form button:disabled{background-color:var(--border);color:var(--gray);cursor:not-allowed}.loading-dots span{opacity:0;animation:blink 1s infinite}.loading-dots span:nth-child(2){animation-delay:.2s}.loading-dots span:nth-child(3){animation-delay:.4s}@keyframes blink{0%{opacity:0}50%{opacity:1}to{opacity:0}}.ai-message-content{display:flex;align-items:center;gap:12px}.play-button,.reveal-button{background:var(--teal);color:var(--white);border:none;border-radius:50%;width:38px;height:38px;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;transition:background .2s}.reveal-button{width:auto;border-radius:20px;padding:8px 14px;font-size:.8rem;gap:5px}.play-button:hover,.reveal-button:hover{background:var(--teal-mid)}.ai-message-content p{margin:0}.speaking-form{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1rem;border-top:1px solid var(--border);min-height:94px;flex-shrink:0;background:var(--white)}.mic-button{background:var(--teal);color:var(--white);border:none;width:56px;height:56px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s}.mic-button:hover{background:var(--teal-mid)}.mic-button.recording{background:var(--coral);animation:pulse 1.5s infinite}.recording-status{color:var(--gray);font-size:.8rem;margin-top:10px;height:1em}@keyframes pulse{0%{box-shadow:0 0 #e05a3ab3}70%{box-shadow:0 0 0 10px #e05a3a00}to{box-shadow:0 0 #e05a3a00}}@media (max-width: 768px){.chatbot-container{width:100%;height:100dvh;max-width:100%;max-height:100%;border-radius:0}.chatbot-header,.chatbot-body{padding:1rem}.chat-bubble{max-width:90%}}@keyframes fadeInSlideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.storage-only-label{font-size:13px;color:var(--gray);margin:0;padding:4px 0}.lesson-detail-container{padding:2rem;max-width:900px;margin:2rem auto;color:var(--charcoal);animation:fadeInSlideUp .4s ease-out forwards}.back-link{display:inline-flex;align-items:center;gap:6px;margin-bottom:2rem;color:var(--gray);text-decoration:none;font-weight:500;font-size:14px;transition:color .2s}.back-link:hover{color:var(--teal)}.lesson-header{background:var(--charcoal);border-radius:16px;padding:2rem;margin-bottom:2.5rem;text-align:center}.lesson-header h1{font-size:2rem;margin:0;color:var(--white);font-weight:800;letter-spacing:-.5px}.lesson-header p{font-size:1rem;color:#ffffff80;margin-top:.5rem}.ai-summary-section,.materials-section{margin-bottom:2.5rem}.ai-summary-section h2,.materials-section h2{font-size:1.3rem;color:var(--charcoal);border-bottom:2px solid var(--cream-dark);padding-bottom:.5rem;margin-bottom:1.5rem;font-weight:700;letter-spacing:-.2px}.ai-summary-section p{line-height:1.7;color:var(--gray)}.materials-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}.material-card{background-color:var(--white);border:1px solid var(--border);border-radius:12px;overflow:hidden;transition:all .2s ease;display:flex;flex-direction:column}.material-card:hover{border-color:var(--teal);box-shadow:0 4px 16px #0f7b6c1a;transform:translateY(-2px)}.card-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;background-color:var(--cream);border-bottom:1px solid var(--border)}.card-title{display:flex;align-items:center;gap:.75rem;font-weight:700;font-size:1rem;color:var(--charcoal)}.icon-button{background:none;border:none;color:var(--gray);cursor:pointer;padding:.4rem;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .2s}.icon-button:hover{background-color:var(--cream-dark);color:var(--charcoal)}.card-body{padding:1.5rem;flex-grow:1;display:flex;flex-direction:column;justify-content:center}.practice-buttons{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}.practice-buttons button{background-color:var(--teal-light);color:var(--teal);border:1px solid rgba(15,123,108,.2);padding:.75rem;border-radius:8px;cursor:pointer;font-weight:600;font-size:13px;transition:all .2s;text-align:center;font-family:inherit}.practice-buttons button:hover{background-color:var(--teal);color:var(--white);border-color:var(--teal)}.status-text{text-align:center;color:var(--gray);font-style:italic;font-size:14px}.error-text{color:var(--coral);font-weight:600}.material-card.processing,.material-card.failed{opacity:.65}@media (max-width: 768px){.lesson-detail-container{padding:1rem;margin:1rem auto}.lesson-header h1{font-size:1.6rem}.materials-grid{grid-template-columns:1fr}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--cream);color:var(--charcoal);line-height:1.6}.App{min-height:100vh}.loading{display:flex;align-items:center;justify-content:center;min-height:100vh;font-size:16px;color:var(--gray);background:var(--cream)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--cream)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--gray)}@media (max-width: 768px){body{font-size:14px}}