:root{--bg-color: #f9fafb;--surface-color: #ffffff;--text-color: #111827;--text-muted: #4b5563;--border-color: #e5e7eb;--primary-color: #3b82f6;--primary-hover: #2563eb;--ring-color: rgba(59, 130, 246, .1);--success-bg: #d1fae5;--success-border: #10b981;--error-bg: #fee2e2;--error-border: #ef4444}:root.dark{--bg-color: #111827;--surface-color: #1f2937;--text-color: #f3f4f6;--text-muted: #9ca3af;--border-color: #374151;--primary-color: #3b82f6;--primary-hover: #60a5fa;--ring-color: rgba(59, 130, 246, .2);--success-bg: rgba(6, 95, 70, .3);--success-border: #10b981;--error-bg: rgba(153, 27, 27, .3);--error-border: #ef4444}.pagination{display:flex;justify-content:center;align-items:center;gap:1.5rem;margin:2rem 0;padding:1rem;background:var(--surface-color);border-radius:8px;border:1px solid var(--border-color)}.pagination-info{font-size:.95rem;color:var(--text-muted)}.pagination-btn{padding:.5rem 1rem;border-radius:6px;border:1px solid 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var(--ring-color)}.cloze-input.correct{border-color:#10b981;background-color:#d1fae5;color:#065f46}.cloze-input.incorrect{border-color:#ef4444;background-color:#fee2e2;color:#991b1b}.cloze-input.finished{opacity:1;background-color:var(--bg-color);border-color:var(--primary-color);cursor:default;font-weight:600}.translation-section{margin-bottom:1.5rem}.translation-input{width:100%;padding:1rem;font-size:1.2rem;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-color);color:var(--text-color);resize:vertical}.translation-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px var(--ring-color)}.answer-section{margin-bottom:1.5rem;padding:1rem;background:var(--success-bg, #d1fae5);border:1px solid var(--success-border, #10b981);border-radius:8px}.practice-actions{display:flex;justify-content:center;gap:1rem}.feedback-message{margin-top:1rem;padding:1rem;border-radius:8px;text-align:center;font-weight:700}.feedback-message.success{background-color:#d1fae5;color:#065f46;border:1px solid #10b981}.feedback-message.error{background-color:#fee2e2;color:#991b1b;border:1px solid #ef4444}.mode-selector{display:flex;gap:.5rem;background:var(--bg-secondary);padding:.25rem;border-radius:8px;border:1px solid var(--border-color)}.mode-btn{padding:.4rem 1rem;border-radius:6px;border:none;background:transparent;color:var(--text-secondary);cursor:pointer;font-size:.9rem;transition:all .2s}.mode-btn.active{background:var(--card-bg);color:var(--primary-color);box-shadow:0 2px 4px #0000001a}.definition-box{background:var(--bg-secondary);padding:1.5rem;border-radius:8px;border-left:4px solid var(--primary-color);font-size:1.1rem;line-height:1.6;margin-bottom:1.5rem}.blocks-container{display:flex;flex-wrap:wrap;gap:.5rem;padding:1rem;border-radius:8px;min-height:3rem;align-items:center}.result-area{background:var(--bg-secondary);border:2px dashed var(--border-color);margin-bottom:1.5rem}.pool-area{background:var(--surface-color);border:1px solid var(--border-color)}.block{background:var(--surface-color);border:1px solid var(--border-color);padding:.5rem 1rem;border-radius:6px;cursor:pointer;-webkit-user-select:none;user-select:none;transition:all .2s;box-shadow:0 1px 3px #0000001a}.block:hover{border-color:var(--primary-color);transform:translateY(-1px)}.block.selected{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.placeholder{color:var(--text-muted);font-style:italic}.error-box{background:#fee2e2;color:#991b1b;padding:1rem;border-radius:8px;border:1px solid #fecaca;font-size:1.1rem;margin-bottom:1.5rem;text-align:center}.prompt-box{background:#e0e7ff;color:#1e40af;padding:1rem;border-radius:8px;border:1px solid #c7d2fe;font-size:1.1rem;margin-bottom:1rem}.practice-textarea{width:100%;min-height:120px;padding:1rem;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-color);color:var(--text-color);font-family:inherit;font-size:1rem;resize:vertical;margin-bottom:1rem}.tip{font-size:.85rem;color:var(--text-secondary);font-style:italic}.feedback-banner{padding:.75rem;border-radius:6px;text-align:center;font-weight:600;margin-bottom:1rem}.feedback-banner.success{background:var(--success-bg, #d1fae5);color:var(--success-text, #065f46)}.feedback-banner.failure{background:var(--error-bg, #fee2e2);color:var(--error-text, #991b1b)}.feedback-text{font-size:1rem;color:var(--text-color);line-height:1.5;margin-bottom:1rem}.correct-answer{background:var(--bg-color, #f3f4f6);color:var(--text-color, #1f2937);padding:.75rem;border-radius:6px;border-left:4px solid var(--success-border, #10b981);font-family:monospace}.grade-actions{display:flex;gap:.5rem;justify-content:center;width:100%}.grade-btn{padding:.5rem 1rem;border-radius:6px;border:1px solid var(--border-color);background:var(--surface-color);color:var(--text-color);cursor:pointer;transition:all .2s}.grade-btn.again{background-color:#fee2e2;color:#991b1b;border-color:#fecaca}.grade-btn.hard{background-color:#ffedd5;color:#9a3412;border-color:#fed7aa}.grade-btn.good{background-color:#d1fae5;color:#065f46;border-color:#a7f3d0}.grade-btn.easy{background-color:#e0e7ff;color:#1e40af;border-color:#c7d2fe}.practice-input,.practice-textarea{width:100%;padding:.75rem;font-size:1.1rem;border:2px solid var(--border-color);border-radius:8px;background:var(--bg-color);color:var(--text-color);outline:none}.practice-input:focus{border-color:var(--primary-color)}.practice-input.correct{border-color:#10b981}.practice-input.incorrect{border-color:#ef4444}.feedback-msg{margin-top:1rem;text-align:center;font-weight:700}.feedback-msg.success{color:#10b981}.feedback-msg.error{color:#ef4444}.answer-reveal{margin-top:1rem;padding:1rem;background:var(--bg-secondary);border-radius:8px;text-align:center}.setup-view .practice-card{max-width:600px;margin:2rem auto}.setup-section{margin-bottom:2rem;text-align:left}.setup-section h3{font-size:1.1rem;margin-bottom:1rem;color:var(--text-color);border-bottom:1px solid var(--border-color);padding-bottom:.5rem}.checkbox-group,.radio-group{display:flex;flex-direction:column;gap:.75rem}.checkbox-item,.radio-item{display:flex;align-items:center;gap:.75rem;cursor:pointer;padding:.5rem;border-radius:6px;transition:background .2s}.checkbox-item:hover,.radio-item:hover{background:var(--bg-secondary)}.checkbox-item input,.radio-item input{width:1.2rem;height:1.2rem;cursor:pointer}.setup-actions{margin-top:2rem;display:flex;justify-content:center}.start-btn{padding:.8rem 2.5rem;font-size:1.1rem}.back-btn{background:transparent;border:none;color:var(--text-muted);cursor:pointer;font-size:1rem;padding:.5rem;transition:color .2s}.back-btn:hover{color:var(--primary-color)}.topics-tree-container{max-height:300px;overflow-y:auto;border:1px solid var(--border-color);border-radius:8px;padding:1rem;background:var(--bg-color);margin-bottom:1rem}.topics-grid{display:flex;flex-direction:column;gap:.5rem}.topic-item{border:1px solid var(--border-color);border-radius:6px;padding:.5rem;background:var(--surface-color)}.topic-header{display:flex;align-items:center;font-weight:700;margin-bottom:.25rem}.btn-toggle{background:none;border:none;cursor:pointer;padding:.25rem;display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:transform .2s}.btn-toggle:hover{color:var(--primary-color)}.btn-toggle.collapsed{transform:rotate(-90deg)}.subtopics-list{padding-left:1.5rem;display:flex;flex-direction:column;gap:.25rem;border-left:1px dashed var(--border-color);margin-left:.5rem}.checkbox-item.small{font-size:.9rem}.loading-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem 1rem;text-align:center;color:var(--text-muted)}.spinner{width:40px;height:40px;border:4px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:1.5rem}@keyframes spin{to{transform:rotate(360deg)}}.modal-overlay{position:fixed;inset:0;background-color:#0009;display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background-color:var(--surface-color);border-radius:12px;width:90%;max-width:500px;max-height:90vh;display:flex;flex-direction:column;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a;padding:0}.modal-header{padding:1.5rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.modal-header h2{margin:0;font-size:1.25rem}.modal-body{padding:1.5rem}.modal-actions{padding:1.5rem;border-top:1px solid var(--border-color);display:flex;justify-content:flex-end;gap:1rem}.btn-close{background:none;border:none;font-size:1.25rem;cursor:pointer;color:var(--text-muted)}.btn-cancel{background:none;border:1px solid var(--border-color);padding:.6rem 1.2rem;border-radius:8px;cursor:pointer;color:var(--text-color)}.mode-option:hover{background-color:var(--ring-color)!important;border-color:var(--primary-color)!important}.modal-overlay{position:fixed;inset:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background-color:var(--surface-color);padding:2rem;border-radius:12px;width:100%;max-width:500px;box-shadow:0 10px 25px #0000001a}.modal-content h2{margin-top:0;margin-bottom:1.5rem;color:var(--text-color)}.form-group{margin-bottom:1.25rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:600;color:var(--text-color)}.form-group input,.form-group textarea{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:6px;background-color:var(--surface-color);color:var(--text-color);font-family:inherit}.form-group textarea{min-height:100px;resize:vertical}.modal-actions{display:flex;justify-content:flex-end;gap:1rem;margin-top:2rem}.btn-primary{background-color:var(--primary-color);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:6px;font-weight:600;cursor:pointer}.btn-primary:disabled{opacity:.7;cursor:not-allowed}.btn-secondary{background-color:transparent;color:var(--text-muted);border:1px solid var(--border-color);padding:.75rem 1.5rem;border-radius:6px;font-weight:600;cursor:pointer}.btn-secondary:hover{background-color:var(--ring-color)}.auth-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background-color:var(--bg-color, #f3f4f6)}.auth-card{background-color:var(--surface-color, #ffffff);padding:2rem;border-radius:8px;box-shadow:0 4px 6px #0000001a;width:100%;max-width:400px;text-align:center}.auth-card h2{margin-bottom:1.5rem;color:var(--text-color, #333333)}.auth-form{display:flex;flex-direction:column;gap:1rem}.auth-form-group{display:flex;flex-direction:column;text-align:left}.auth-form-group label{margin-bottom:.5rem;font-size:.875rem;color:var(--text-color, #333333)}.auth-form-group input{padding:.75rem;border:1px solid var(--border-color, #d1d5db);border-radius:4px;font-size:1rem;background-color:var(--bg-color, #ffffff);color:var(--text-color, #333333)}.auth-button{padding:.75rem;background-color:#3b82f6;color:#fff;border:none;border-radius:4px;font-size:1rem;cursor:pointer;margin-top:1rem}.auth-button:disabled{background-color:#9ca3af;cursor:not-allowed}.auth-error{color:#ef4444;font-size:.875rem;margin-bottom:1rem;text-align:left}.auth-link{margin-top:1rem;font-size:.875rem;color:#3b82f6;text-decoration:none}.users-page{padding:2rem;max-width:1200px;margin:0 auto}.users-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.users-header h2{font-size:1.5rem;color:var(--text-color, #111827)}.users-table-container{background:var(--surface-color, #ffffff);border-radius:8px;box-shadow:0 1px 3px #0000001a;overflow:hidden}.users-table{width:100%;border-collapse:collapse;text-align:left}.users-table th,.users-table td{padding:1rem;border-bottom:1px solid var(--border-color, #e5e7eb)}.users-table th{background-color:var(--bg-color, #f9fafb);font-weight:600;color:var(--text-color, #374151);text-transform:uppercase;font-size:.75rem;letter-spacing:.05em}.users-table tbody tr:hover{background-color:var(--bg-color-hover, #f3f4f6)}.badge{display:inline-flex;align-items:center;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:500}.badge-approved{background-color:#d1fae5;color:#065f46}.badge-pending{background-color:#fef3c7;color:#92400e}.badge-admin{background-color:#ede9fe;color:#5b21b6}.badge-user{background-color:#f3f4f6;color:#374151}.action-buttons{display:flex;gap:.5rem}.btn-approve{padding:.25rem .75rem;background-color:#10b981;color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:.875rem}.btn-approve:hover{background-color:#059669}.btn-delete{padding:.25rem .75rem;background-color:transparent;color:#ef4444;border:1px solid #ef4444;border-radius:4px;cursor:pointer;font-size:.875rem}.btn-delete:hover{background-color:#fef2f2}.modal-overlay{position:fixed;inset:0;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000}.modal-content{background-color:var(--surface-color, #ffffff);padding:2rem;border-radius:8px;max-width:400px;width:100%}.modal-content h3{margin-bottom:1rem;color:var(--text-color, #111827)}.modal-content p{margin-bottom:1.5rem;color:var(--text-color-muted, #4b5563);line-height:1.5}.modal-actions{display:flex;justify-content:flex-end;gap:1rem}.btn-cancel{padding:.5rem 1rem;background-color:#e5e7eb;color:#374151;border:none;border-radius:4px;cursor:pointer}.btn-cancel:hover{background-color:#d1d5db}.btn-confirm-delete{padding:.5rem 1rem;background-color:#ef4444;color:#fff;border:none;border-radius:4px;cursor:pointer}.btn-confirm-delete:hover{background-color:#dc2626}