.btn{padding:.625rem 1.25rem;border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s;border:none;display:inline-flex;align-items:center;justify-content:center;gap:.5rem}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-sm{padding:.375rem .75rem;font-size:.8rem}.btn-primary{background:#6366f1;color:#fff}.btn-primary:hover:not(:disabled){background:#4f46e5}.btn-secondary{background:#f1f5f9;color:#475569;border:1px solid #e2e8f0}.btn-secondary:hover:not(:disabled){background:#e2e8f0}.btn-success{background:#10b981;color:#fff}.btn-success:hover:not(:disabled){background:#059669}.btn-danger{background:#dc2626;color:#fff}.btn-danger:hover:not(:disabled){background:#b91c1c}.btn-warning{background:#d97706;color:#fff}.btn-warning:hover:not(:disabled){background:#b45309}.btn-icon{width:36px;height:36px;padding:0;border-radius:8px;border:1px solid var(--border-color, #e2e8f0);background:#fff;cursor:pointer;font-size:1.25rem;color:#475569;display:inline-flex;align-items:center;justify-content:center}.btn-icon:hover:not(:disabled){background:#f1f5f9}.btn-icon-sm{width:32px;height:32px;font-size:1rem}.btn-link{background:none;border:none;color:#6366f1;cursor:pointer;font-size:.875rem;padding:0}.btn-link:hover{text-decoration:underline}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:var(--modal-bg, #1f2937);border:1px solid var(--modal-border, #374151);border-radius:12px;padding:24px;width:100%;max-width:480px;max-height:90vh;overflow-y:auto;box-shadow:0 25px 50px -12px #00000080}.modal-sm{max-width:400px}.modal-lg{max-width:640px}.modal-content{background:#fff;border-radius:12px;width:100%;max-width:450px;box-shadow:0 20px 60px #0003}.modal h2,.modal-header h3{font-size:1.125rem;font-weight:600;margin:0;color:var(--text-primary, #f3f4f6)}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.25rem;border-bottom:1px solid var(--border-color, #e2e8f0)}.modal-header .close-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;color:#94a3b8;line-height:1}.modal-header .close-btn:hover{color:#475569}.modal-body{padding:1.25rem}.modal-footer,.modal-actions{display:flex;justify-content:flex-end;gap:.75rem;padding:1rem 1.25rem;border-top:1px solid var(--border-color, #e2e8f0)}.modal-description{color:#9ca3af;margin:0 0 20px}.confirm-message{font-size:15px;color:#d1d5db;line-height:1.6;margin-bottom:16px}.confirm-message strong{color:#f3f4f6}.table-container{overflow-x:auto}.data-table{width:100%;border-collapse:collapse;font-size:14px}.data-table th{text-align:left;padding:12px 16px;background:var(--bg-secondary, #f8fafc);border-bottom:1px solid var(--border-color, #e2e8f0);font-weight:600;color:var(--text-secondary, #64748b);white-space:nowrap}.data-table td{padding:12px 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#475569);margin-bottom:.375rem}.form-input,.form-select,.form-textarea{width:100%;padding:.625rem .75rem;border:1px solid var(--border-color, #e2e8f0);border-radius:8px;font-size:.9rem;font-family:inherit;color:var(--text-primary, #1a1a2e);background:var(--input-bg, white)}.form-textarea{resize:vertical;min-height:100px}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:#6366f1;box-shadow:0 0 0 3px #6366f11a}.form-hint{font-size:12px;color:var(--text-secondary, #64748b);margin-top:6px}.filter-select{padding:.5rem 1rem;border:1px solid var(--border-color, #e2e8f0);border-radius:8px;font-size:.875rem;color:#475569;background:#fff;cursor:pointer}.filter-select:focus{outline:none;border-color:#6366f1}.filters-bar,.filters{display:flex;gap:1rem;margin-bottom:16px}.radio-group{display:flex;flex-direction:column;gap:8px}.radio-label{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--input-bg, #111827);border:2px solid transparent;border-radius:8px;cursor:pointer;transition:all .2s}.radio-label:hover{border-color:#6366f14d}.radio-label.selected{border-color:#6366f1;background:#6366f11a}.radio-label input[type=radio]{width:18px;height:18px;accent-color:#6366f1}.radio-text{font-size:14px;color:var(--text-primary, #f3f4f6)}.status-badge{display:inline-block;padding:4px 8px;border-radius:4px;font-size:12px;font-weight:500;text-transform:capitalize}.status-badge.status-draft{background:var(--bg-tertiary, #f1f5f9);color:var(--text-secondary, #64748b)}.status-badge.status-pending{background:#ffc1071a;color:var(--warning-color, #d97706)}.status-badge.status-approved{background:#4caf501a;color:var(--success-color, #16a34a)}.status-badge.status-rejected{background:#f443361a;color:var(--error-text, #dc2626)}.difficulty-badge{font-size:.7rem;font-weight:500;padding:.25rem .5rem;border-radius:4px}.difficulty-beginner{background:#dcfce7;color:#16a34a}.difficulty-intermediate{background:#fef3c7;color:#d97706}.difficulty-advanced{background:#fee2e2;color:#dc2626}.improvement-badge{font-size:.8rem;font-weight:600;padding:.25rem .5rem;border-radius:4px}.improvement-positive{background:#dcfce7;color:#16a34a}.improvement-negative{background:#fee2e2;color:#dc2626}.improvement-neutral{background:#f1f5f9;color:#64748b}.tab-badge{display:inline-flex;align-items:center;justify-content:center;min-width:18px;height:18px;padding:0 6px;margin-left:6px;background:#ef4444;color:#fff;font-size:11px;font-weight:600;border-radius:9px}.score-badge{font-size:.8rem;font-weight:600;color:#1a1a2e;background:#e2e8f0;padding:.25rem .5rem;border-radius:4px}.card{background:var(--bg-secondary, white);border:1px solid var(--border-color, #e2e8f0);border-radius:12px;padding:1.25rem}.card:hover{border-color:#6366f1;box-shadow:0 4px 12px #6366f11a}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.75rem}.card-title{font-size:1.125rem;font-weight:600;color:var(--text-primary, #1a1a2e);margin:0}.card-description{color:var(--text-secondary, #64748b);line-height:1.6;margin:0}.card-footer{display:flex;justify-content:space-between;align-items:center;padding-top:.75rem;border-top:1px solid var(--border-color, #f1f5f9)}.stat-card{background:var(--bg-secondary, #f8fafc);border:1px solid var(--border-color, #e2e8f0);border-radius:12px;padding:20px}.stat-card h3{font-size:14px;font-weight:500;color:var(--text-secondary, #64748b);margin:0 0 8px}.stat-value{font-size:36px;font-weight:700;color:var(--text-primary, #1a1a2e);margin-bottom:12px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-bottom:32px}.mini-stat{background:#1e293b;border-radius:8px;padding:16px 24px;display:flex;flex-direction:column;align-items:center;gap:4px}.mini-stat-value{font-size:24px;font-weight:700;color:#f3f4f6}.mini-stat-label{font-size:12px;color:#9ca3af}.settings-card{background:var(--bg-secondary, #1f2937);border:1px solid var(--border-color, #374151);border-radius:12px;padding:24px}.loading-state{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:4rem;color:#64748b}.spinner{width:40px;height:40px;border:3px solid #e2e8f0;border-top-color:#6366f1;border-radius:50%;animation:spin .8s linear infinite;margin-bottom:1rem}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:4rem;text-align:center;color:#64748b}.empty-state-card{grid-column:1/-1;text-align:center;padding:40px 20px;color:var(--text-secondary, #64748b);font-style:italic;background:var(--bg-secondary, white);border-radius:8px;border:1px dashed var(--border-color, #e2e8f0)}.error-banner{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background:#fef2f2;border:1px solid #fecaca;color:#dc2626;font-size:.875rem;border-radius:8px;margin-bottom:16px}.error-banner .close-btn{background:none;border:none;font-size:1.25rem;cursor:pointer;color:#dc2626}.error-message{background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:.75rem;color:#dc2626;font-size:.875rem;margin-bottom:1rem}.warning-box{background:#f59e0b1a;border:1px solid rgba(245,158,11,.3);border-radius:8px;padding:12px 16px;color:#fbbf24;font-size:14px;font-weight:500;text-align:center}.success-state{text-align:center;padding:40px 20px}.success-state .success-icon{display:inline-flex;align-items:center;justify-content:center;width:64px;height:64px;background:#10b981;color:#fff;font-size:32px;border-radius:50%;margin-bottom:16px}.hint-box{padding:.75rem 1rem;background:#fef3c7;border-radius:8px;font-size:.875rem;color:#92400e}.hint-label{font-weight:600}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.section-header h2{font-size:20px;font-weight:600;margin:0}.section-subtitle{font-size:14px;color:var(--text-secondary, #64748b);margin:4px 0 0}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#f5f7fa}