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var(--transition-normal);text-align:center;flex-direction:column;justify-content:center;align-items:center;display:flex}.import-students__dropzone:hover{border-color:var(--color-primary);background:var(--color-bg-tertiary)}.import-students__dropzone-icon{color:var(--color-primary);margin-bottom:var(--space-sm)}.import-students__dropzone-text{font-size:var(--text-sm);color:var(--color-text-primary);margin-bottom:2px}.import-students__dropzone-sub{font-size:var(--text-xs);color:var(--color-text-secondary)}.import-students__loading{justify-content:center;align-items:center;gap:var(--space-sm);padding:var(--space-md);font-size:var(--text-sm);color:var(--color-primary);display:flex}.import-students__spinner{border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;width:16px;height:16px;animation:.8s linear infinite spin}.import-students__ai-header{justify-content:space-between;align-items:center;gap:var(--space-sm);display:flex}.import-students__key-btn{border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:var(--text-xs);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);background:0 0;align-items:center;gap:4px;padding:4px 8px;display:flex}.import-students__key-btn:hover{color:var(--color-text-primary);border-color:var(--color-primary)}.import-students__key-box{background:var(--color-bg-secondary);border:1px solid var(--color-border);padding:var(--space-sm);border-radius:var(--radius-md)}.import-students__preview{gap:var(--space-md);flex-direction:column;display:flex}.import-students__preview-header{justify-content:space-between;align-items:center;display:flex}.import-students__preview-count{font-size:var(--text-sm);color:var(--color-text-primary)}.import-students__table-container{border:1px solid var(--color-border);border-radius:var(--radius-md);max-height:340px;overflow-y:auto}.import-students__table{border-collapse:collapse;width:100%;font-size:var(--text-sm)}.import-students__table th{background:var(--color-bg-secondary);padding:var(--space-xs) var(--space-sm);text-align:left;font-weight:var(--font-medium);color:var(--color-text-secondary);border-bottom:1px solid var(--color-border);z-index:1;position:sticky;top:0}.import-students__table td{padding:4px var(--space-sm);border-bottom:1px solid var(--color-border)}.import-students__index-col{color:var(--color-text-tertiary,#9ca3af);font-size:var(--text-xs);text-align:center}.import-students__cell-input{border-radius:var(--radius-sm);width:100%;color:var(--color-text-primary);font-size:var(--text-sm);transition:all var(--transition-fast);background:0 0;border:1px solid #0000;padding:4px 8px}.import-students__cell-input:focus{background:var(--color-bg-primary);border-color:var(--color-primary);outline:none}.import-students__del-btn{color:var(--color-text-secondary);cursor:pointer;border-radius:var(--radius-sm);transition:all var(--transition-fast);background:0 0;border:none;justify-content:center;align-items:center;padding:4px;display:flex}.import-students__del-btn:hover{color:var(--color-danger,#ef4444);background:var(--color-danger-subtle,#ef44441a)}.import-students__actions{margin-top:var(--space-sm);justify-content:space-between;align-items:center;display:flex}.students-tab{gap:var(--space-md);flex-direction:column;display:flex}.students-tab__toolbar{justify-content:space-between;align-items:center;gap:var(--space-sm);background:var(--color-bg-primary);border:1px solid var(--color-border);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-lg);flex-wrap:wrap;display:flex}.students-tab__info{align-items:center;gap:var(--space-md);display:flex}.students-tab__badge{background:var(--color-primary-subtle,#4f46e51a);color:var(--color-primary);font-size:var(--text-xs);font-weight:var(--font-semibold);border-radius:9999px;align-items:center;padding:4px 10px;display:inline-flex}.students-tab__search{align-items:center;display:flex;position:relative}.students-tab__search-icon{color:var(--color-text-secondary);pointer-events:none;position:absolute;left:10px}.students-tab__search-input{font-size:var(--text-sm);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-secondary);color:var(--color-text-primary);width:220px;transition:all var(--transition-fast);outline:none;padding:6px 12px 6px 32px}.students-tab__search-input:focus{border-color:var(--color-primary);background:var(--color-bg-primary);width:260px}.students-tab__actions{align-items:center;gap:var(--space-xs);display:flex}.students-tab__loading{padding:var(--space-xl);text-align:center;color:var(--color-text-secondary);font-size:var(--text-sm)}.students-tab__empty{padding:var(--space-2xl) var(--space-md);background:var(--color-bg-primary);border:1px dashed var(--color-border);border-radius:var(--radius-lg);text-align:center;flex-direction:column;justify-content:center;align-items:center;display:flex}.students-tab__empty-icon{margin-bottom:var(--space-sm);font-size:2.5rem}.students-tab__empty h3{margin:0 0 var(--space-xs) 0;font-size:var(--text-lg);color:var(--color-text-primary)}.students-tab__empty p{color:var(--color-text-secondary);font-size:var(--text-sm);max-width:380px;margin:0}.students-tab__table-card{background:var(--color-bg-primary);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.students-tab__table-container{max-height:calc(100vh - 280px);overflow-y:auto}.students-tab__table{border-collapse:collapse;width:100%;font-size:var(--text-sm)}.students-tab__table th{background:var(--color-bg-secondary);padding:var(--space-sm) var(--space-md);text-align:left;font-weight:var(--font-semibold);color:var(--color-text-secondary);border-bottom:1px solid var(--color-border);z-index:1;-webkit-user-select:none;user-select:none;position:sticky;top:0}.students-tab__table td{padding:var(--space-sm) var(--space-md);border-bottom:1px solid var(--color-border);vertical-align:middle}.students-tab__table tbody 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var(--color-border);border-radius:var(--radius-md);justify-content:center;align-items:center;gap:2px;padding:2px;display:inline-flex}.students-tab__counter-btn{width:24px;height:24px;color:var(--color-text-secondary);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;justify-content:center;align-items:center;display:flex}.students-tab__counter-btn:hover:not(:disabled){background:var(--color-bg-tertiary);color:var(--color-text-primary)}.students-tab__counter-btn:disabled{opacity:.3;cursor:not-allowed}.students-tab__counter-input{text-align:center;width:38px;color:var(--color-text-primary);font-weight:var(--font-semibold);font-size:var(--text-sm);-moz-appearance:textfield;background:0 0;border:none}.students-tab__counter-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.students-tab__counter-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.students-tab__counter-input:focus{background:var(--color-bg-primary);border-radius:var(--radius-sm);outline:none}.students-tab__row-actions{justify-content:flex-end;align-items:center;gap:4px;display:flex}.students-tab__action-btn{width:28px;height:28px;color:var(--color-text-secondary);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;justify-content:center;align-items:center;display:flex}.students-tab__action-btn:hover{background:var(--color-bg-secondary);color:var(--color-text-primary)}.students-tab__action-btn--danger:hover{background:var(--color-danger-subtle,#ef44441a);color:var(--color-danger,#ef4444)}.class-detail{max-width:960px;padding-bottom:120px}.class-detail__header{margin-bottom:var(--space-lg);justify-content:space-between;align-items:flex-start;gap:var(--space-md);flex-wrap:wrap;display:flex}.class-detail__title{font-size:var(--text-xl);font-weight:var(--font-bold)}.class-detail__subject{font-size:var(--text-sm);color:var(--text-secondary)}.class-detail__actions{gap:var(--space-sm);display:flex}.class-detail__tabs{gap:var(--space-xs);border-bottom:2px solid var(--border-secondary);margin-bottom:var(--space-xl);background:var(--bg-primary);z-index:10;padding-top:var(--space-xs);scrollbar-width:none;-ms-overflow-style:none;display:flex;position:sticky;top:0;overflow-x:auto}.class-detail__tabs::-webkit-scrollbar{display:none}.class-detail__tab{align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-md);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--text-secondary);transition:all var(--transition-fast);white-space:nowrap;border-bottom:2px solid #0000;margin-bottom:-2px;display:flex}.class-detail__tab:hover{color:var(--text-primary)}.class-detail__tab--active{color:var(--accent-primary);border-bottom-color:var(--accent-primary)}.class-detail__content{min-height:400px}.class-detail__loading,.class-detail__not-found{padding:var(--space-2xl);text-align:center;color:var(--text-tertiary)}@media (width<=640px){.class-detail__header{flex-direction:column;align-items:flex-start}.class-detail__tab{padding:var(--space-sm);font-size:var(--text-xs);flex:1;justify-content:center}}.quiz-dashboard{gap:var(--space-xl);flex-direction:column;display:flex}.quiz-dashboard__loading{padding:var(--space-2xl);text-align:center;color:var(--text-tertiary)}.quiz-dashboard__header{justify-content:space-between;align-items:flex-start;gap:var(--space-md);flex-wrap:wrap;display:flex}.quiz-dashboard__title{font-size:var(--text-2xl);font-weight:var(--font-bold);color:var(--text-primary)}.quiz-dashboard__subtitle{font-size:var(--text-sm);color:var(--text-secondary);margin-top:4px}.quiz-dashboard__tabs{gap:var(--space-xs);border-bottom:2px solid var(--border-secondary);display:flex}.quiz-dashboard__tab{align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-md);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--text-secondary);border-bottom:2px solid #0000;margin-bottom:-2px;display:flex}.quiz-dashboard__tab--active{color:var(--accent-primary);border-bottom-color:var(--accent-primary)}.quiz-dashboard__empty{justify-content:center;align-items:center;gap:var(--space-md);padding:var(--space-2xl);background:var(--bg-secondary);border-radius:var(--radius-xl);text-align:center;border:1px dashed var(--border-secondary);flex-direction:column;display:flex}.quiz-dashboard__empty-icon{color:var(--accent-primary)}.quiz-dashboard__grid{gap:var(--space-lg);grid-template-columns:repeat(auto-fill,minmax(320px,1fr));display:grid}.quiz-dashboard__card{gap:var(--space-md);padding:var(--space-lg);flex-direction:column;justify-content:space-between;display:flex}.quiz-dashboard__card-header{justify-content:space-between;align-items:center;display:flex}.quiz-dashboard__slides-count{font-size:var(--text-xs);color:var(--text-tertiary);align-items:center;gap:4px;display:flex}.quiz-dashboard__card-title{font-size:var(--text-lg);font-weight:var(--font-bold);color:var(--text-primary)}.quiz-dashboard__card-desc{font-size:var(--text-sm);color:var(--text-secondary);text-overflow:ellipsis;-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.quiz-dashboard__card-actions{justify-content:space-between;align-items:center;gap:var(--space-sm);padding-top:var(--space-md);border-top:1px solid var(--border-secondary);flex-wrap:wrap;display:flex}.quiz-dashboard__btn-group{align-items:center;gap:var(--space-xs);display:flex}.quiz-dashboard__action-btn{border-radius:var(--radius-md);background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-secondary);font-size:var(--text-xs);font-weight:var(--font-medium);cursor:pointer;white-space:nowrap;transition:all var(--transition-fast);align-items:center;gap:6px;padding:6px 12px;display:inline-flex}.quiz-dashboard__action-btn:hover{background:var(--bg-hover);border-color:var(--border-primary)}.quiz-dashboard__action-btn--delete{color:var(--color-error,#ef4444);padding:6px 8px}.quiz-dashboard__action-btn--delete:hover{background:#ef444426;border-color:#ef44444d}.quiz-dashboard__qr-modal{align-items:center;gap:var(--space-md);text-align:center;padding:var(--space-md) 0;flex-direction:column;display:flex}.quiz-dashboard__qr-box{padding:var(--space-md);border-radius:var(--radius-lg);background:#fff}.quiz-dashboard__qr-pin{font-size:var(--text-lg)}.quiz-dashboard__qr-hint{font-size:var(--text-xs);color:var(--text-tertiary)}.word-cloud{justify-content:center;align-items:center;gap:var(--space-md) var(--space-lg);padding:var(--space-xl);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#00000040;flex-wrap:wrap;width:100%;min-height:240px;max-height:380px;display:flex;overflow-y:auto}.word-cloud__empty{padding:var(--space-2xl);font-size:var(--text-base);color:#ffffffb3;border-radius:var(--radius-xl);background:#0003;justify-content:center;align-items:center;width:100%;font-style:italic;display:flex}.word-cloud__tag{font-weight:var(--font-bold);border-radius:var(--radius-md);transition:transform var(--transition-normal), font-size var(--transition-normal);text-shadow:0 2px 8px #0006;background:#ffffff14;align-items:center;gap:6px;padding:4px 10px;line-height:1.2;animation:.4s cubic-bezier(.175,.885,.32,1.275) backwards popIn;display:inline-flex}.word-cloud__tag:hover{background:#ffffff2e;transform:scale(1.15)translateY(-2px)}.word-cloud__tag-count{border-radius:var(--radius-full);color:#fff;font-size:.65em;font-weight:var(--font-medium);vertical-align:super;background:#fff3;padding:2px 6px}@keyframes popIn{0%{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}.quiz-builder{height:calc(100vh - var(--navbar-height));margin:calc(-1 * var(--space-xl));background:var(--bg-primary);flex-direction:column;display:flex}.quiz-builder__loading{padding:var(--space-2xl);text-align:center;color:var(--text-tertiary)}.quiz-builder__topbar{padding:var(--space-sm) var(--space-lg);background:var(--bg-secondary);border-bottom:1px solid var(--border-secondary);justify-content:space-between;align-items:center;height:56px;display:flex}.quiz-builder__topbar-left{align-items:center;gap:var(--space-md);flex:1;display:flex}.quiz-builder__title-input{font-size:var(--text-lg);font-weight:var(--font-bold);color:var(--text-primary);background:0 0;border:none;outline:none;width:320px}.quiz-builder__title-input:focus{border-bottom:2px solid var(--accent-primary)}.quiz-builder__topbar-actions{align-items:center;gap:var(--space-sm);display:flex}.quiz-builder__main{flex:1;display:flex;overflow:hidden}.quiz-builder__slides-sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-secondary);width:220px;padding:var(--space-md);gap:var(--space-md);flex-direction:column;display:flex}.quiz-builder__slides-list{gap:var(--space-sm);flex-direction:column;flex:1;display:flex;overflow-y:auto}.quiz-builder__slide-thumb{align-items:center;gap:var(--space-xs);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);border:2px solid #0000;padding:4px;display:flex}.quiz-builder__slide-thumb--active{border-color:var(--accent-primary);background:var(--accent-primary-light)}.quiz-builder__slide-thumb-num{font-size:var(--text-xs);font-weight:var(--font-bold);text-align:center;width:16px;color:var(--text-secondary)}.quiz-builder__slide-thumb-preview{border-radius:var(--radius-sm);color:#fff;flex:1;justify-content:center;align-items:center;height:60px;padding:4px;display:flex;overflow:hidden}.quiz-builder__slide-thumb-text{text-align:center;text-overflow:ellipsis;-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:10px;display:-webkit-box;overflow:hidden}.quiz-builder__slide-thumb-actions{flex-direction:column;gap:2px;display:flex}.quiz-builder__slide-thumb-actions button{color:var(--text-tertiary);padding:2px}.quiz-builder__slide-thumb-actions button:hover{color:var(--text-primary)}.quiz-builder__add-slide-btn{width:100%}.quiz-builder__canvas-container{padding:var(--space-xl);transition:background var(--transition-normal);flex:1;justify-content:center;align-items:center;display:flex;overflow-y:auto}.quiz-builder__canvas{gap:var(--space-xl);flex-direction:column;align-items:center;width:100%;max-width:800px;display:flex}.quiz-builder__question-input{width:100%;padding:var(--space-md) var(--space-lg);font-size:var(--text-xl);font-weight:var(--font-bold);text-align:center;border-radius:var(--radius-lg);color:#fff;background:#0000004d;border:2px dashed #fff6;outline:none}.quiz-builder__question-input:focus{background:#00000080;border-color:#fff}.quiz-builder__word-cloud-preview-box{width:100%;max-width:700px}.quiz-builder__media-box{border-radius:var(--radius-lg);background:#0003;justify-content:center;align-items:center;width:100%;max-width:480px;min-height:180px;display:flex;overflow:hidden}.quiz-builder__media-input-wrapper{align-items:center;gap:var(--space-sm);width:100%;padding:var(--space-md);color:#ffffffb3;flex-direction:column;display:flex}.quiz-builder__media-url-input{border-radius:var(--radius-md);color:#fff;width:85%;font-size:var(--text-sm);text-align:center;background:#0006;border:1px solid #ffffff4d;padding:8px 12px}.quiz-builder__media-preview{width:100%;height:200px;position:relative}.quiz-builder__media-preview img{object-fit:cover;width:100%;height:100%}.quiz-builder__media-remove{color:#fff;background:#000000b3;border-radius:50%;padding:6px;position:absolute;top:8px;right:8px}.quiz-builder__options-container{gap:var(--space-md);flex-direction:column;width:100%;display:flex}.quiz-builder__options-grid{gap:var(--space-md);grid-template-columns:1fr 1fr;width:100%;display:grid}.quiz-builder__option-card{align-items:center;gap:var(--space-md);padding:10px var(--space-md);border-radius:var(--radius-lg);color:#fff;box-shadow:var(--shadow-md);min-height:56px;display:flex;position:relative}.quiz-builder__option-shape{flex-shrink:0;font-size:22px}.quiz-builder__option-input{font-size:var(--text-sm);font-weight:var(--font-semibold);color:#fff;resize:none;field-sizing:content;word-break:break-word;white-space:pre-wrap;background:0 0;border:none;outline:none;flex:1;align-self:center;height:auto;min-height:1.35em;max-height:2.7em;padding:0;font-family:inherit;line-height:1.35;display:block;overflow:hidden}.quiz-builder__option-input::placeholder{color:#ffffffb3}.quiz-builder__option-actions{align-items:center;gap:var(--space-xs);flex-shrink:0;display:flex}.quiz-builder__option-check{color:#fff6;cursor:pointer;border-radius:var(--radius-full);transition:all var(--transition-fast);background:0 0;border:none;justify-content:center;align-items:center;padding:4px;display:flex}.quiz-builder__option-check:hover{color:#fff}.quiz-builder__option-check--correct{transform:scale(1.2);color:#4ade80!important}.quiz-builder__option-remove{color:#ffffffb3;cursor:pointer;border-radius:var(--radius-full);transition:all 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