.sets-container{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}.set-card{background:linear-gradient(135deg, #fff, #f8fafc);border-radius:24px;border:1px solid var(--gray-200);overflow:hidden;transition:all 0.3s;box-shadow:0 4px 15px rgba(0,0,0,0.02)}.set-card:hover{border-color:var(--primary-light);box-shadow:0 8px 25px rgba(0,0,0,0.05)}.set-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:var(--gray-50);border-bottom:1px solid var(--gray-200)}.set-title{display:flex;align-items:center;gap:12px}.set-badge{font-weight:700;font-size:1.1rem;padding:4px 12px;border-radius:30px}.set-a .set-badge{background:linear-gradient(135deg, #3b82f6, #2563eb);color:white}.set-b .set-badge{background:linear-gradient(135deg, #10b981, #059669);color:white}.set-count{font-size:0.7rem;color:var(--gray-500)}.set-actions{display:flex;gap:8px}.action-icon{background:transparent;border:none;width:32px;height:32px;border-radius:50%;cursor:pointer;transition:all 0.2s;color:var(--gray-500)}.action-icon:hover{background:var(--gray-200);color:var(--danger-color)}.set-textarea{width:100%;min-height:160px;padding:16px;font-family:'Inter',monospace;font-size:0.85rem;line-height:1.6;border:none;resize:vertical}.set-textarea:focus{outline:none}.set-footer{padding:10px 16px;background:var(--gray-50);border-top:1px solid var(--gray-200);font-size:0.7rem;color:var(--gray-500)}.element-preview{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.operation-bar{margin-bottom:24px}.operation-buttons{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}.op-btn{background:white;border:1px solid var(--gray-200);padding:14px 24px;border-radius:60px;cursor:pointer;transition:all 0.3s;text-align:center;min-width:140px}.op-btn i{font-size:1.2rem;margin-right:8px}.op-btn span{display:block;font-weight:600;font-size:0.9rem}.op-btn small{display:block;font-size:0.65rem;color:var(--gray-500);margin-top:2px}.op-btn:hover{transform:translateY(-2px);border-color:var(--primary-color);box-shadow:0 6px 20px rgba(59,130,246,0.15)}.op-btn.active{background:linear-gradient(135deg, var(--primary-color), var(--primary-dark));border-color:transparent;color:white}.op-btn.active small{color:rgba(255,255,255,0.8)}.op-btn.union.active{background:linear-gradient(135deg, #3b82f6, #2563eb)}.op-btn.intersection.active{background:linear-gradient(135deg, #10b981, #059669)}.op-btn.difference.active{background:linear-gradient(135deg, #f59e0b, #d97706)}.op-btn.symdiff.active{background:linear-gradient(135deg, #8b5cf6, #7c3aed)}.result-container{background:var(--gray-50);border-radius:24px;overflow:hidden;margin-bottom:24px}.result-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:white;border-bottom:1px solid var(--gray-200);flex-wrap:wrap;gap:12px}.result-title{display:flex;align-items:center;gap:12px;font-weight:600}.result-badge{background:var(--primary-color);color:white;padding:2px 10px;border-radius:20px;font-size:0.7rem}.result-actions{display:flex;gap:8px}.result-display{min-height:120px;padding:24px;font-family:'Inter',monospace;font-size:0.9rem;line-height:1.8}.result-placeholder{text-align:center;color:var(--gray-400);padding:30px}.result-placeholder i{font-size:48px;margin-bottom:12px}.result-tag{display:inline-block;background:white;border-radius:30px;padding:6px 14px;margin:4px;font-size:0.85rem;transition:all 0.2s;border:1px solid var(--gray-200)}.result-tag:hover{border-color:var(--primary-color);transform:scale(1.02)}.advanced-options{margin-bottom:24px}.advanced-panel{margin-top:16px;padding:20px;background:var(--gray-50);border-radius:16px}.options-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(200px, 1fr));gap:20px}.option-item{display:flex;flex-direction:column;gap:8px}.option-item label{font-size:0.8rem;font-weight:500;color:var(--gray-600)}.toggle-switch{position:relative;display:inline-block;width:50px;height:24px}.toggle-switch input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background-color:var(--gray-300);transition:0.3s;border-radius:34px}.toggle-slider:before{position:absolute;content:"";height:18px;width:18px;left:3px;bottom:3px;background-color:white;transition:0.3s;border-radius:50%}.toggle-switch input:checked+.toggle-slider{background-color:var(--primary-color)}.toggle-switch input:checked+.toggle-slider:before{transform:translateX(26px)}.info-grid{display:grid;grid-template-columns:repeat(2, 1fr);gap:12px;padding:16px}.info-item{display:flex;align-items:center;gap:10px;font-size:0.8rem;color:var(--gray-600);padding:8px;background:white;border-radius:12px}.info-item i{width:28px;color:var(--primary-color)}@media (max-width:768px){.sets-container{grid-template-columns:1fr}.operation-buttons{gap:8px}.op-btn{padding:10px 16px;min-width:auto;flex:1}.op-btn span{font-size:0.75rem}.op-btn i{font-size:1rem}.info-grid{grid-template-columns:1fr}}