.stats-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:20px;margin-bottom:30px}.stat-card{background:white;border-radius:20px;padding:20px;display:flex;align-items:center;gap:16px;border:1px solid var(--gray-200);transition:all 0.3s}.stat-card:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(0,0,0,0.1)}.stat-icon{width:50px;height:50px;background:linear-gradient(135deg, #e0e7ff, #f0f4ff);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:24px;color:var(--primary-color)}.stat-value{font-size:1.6rem;font-weight:700;color:var(--gray-800)}.stat-label{font-size:0.75rem;color:var(--gray-500)}.options-section,.presets-section{margin-bottom:24px}.options-section h3{font-size:1rem;margin-bottom:16px;color:var(--gray-700);display:flex;align-items:center;gap:8px}.options-grid{background:var(--gray-50);border-radius:20px;padding:20px;display:grid;grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));gap:24px}.option-group label{display:block;font-size:0.85rem;font-weight:500;margin-bottom:10px;color:var(--gray-700)}.complexity-buttons{display:flex;gap:10px}.complexity-btn{padding:6px 16px;border:1px solid var(--gray-200);border-radius:30px;background:white;cursor:pointer;font-size:0.8rem;transition:all 0.2s}.complexity-btn.active{background:var(--primary-color);color:white;border-color:var(--primary-color)}.type-checkboxes{display:flex;flex-wrap:wrap;gap:12px}.type-checkboxes label{display:flex;align-items:center;gap:6px;font-size:0.8rem;cursor:pointer}.count-control{display:flex;align-items:center;gap:12px}.count-btn{width:32px;height:32px;border:1px solid var(--gray-300);border-radius:8px;background:white;cursor:pointer;font-size:1.2rem;transition:all 0.2s}.count-btn:hover{background:var(--gray-100)}#itemCount{width:60px;text-align:center;border:1px solid var(--gray-300);border-radius:8px;padding:4px}.presets-header{margin-bottom:12px;font-size:0.85rem;color:var(--gray-600)}.presets-buttons{display:flex;flex-wrap:wrap;gap:12px}.preset-btn{background:var(--gray-100);border:1px solid var(--gray-200);padding:8px 20px;border-radius:40px;font-size:0.8rem;cursor:pointer;transition:all 0.2s}.preset-btn:hover{background:var(--primary-color);color:white}.calc-section{text-align:center;margin:24px 0}.calc-btn{padding:12px 40px;font-size:1rem}.result-section{background:white;border-radius:20px;border:1px solid var(--gray-200);overflow:hidden;margin-bottom:24px;animation:fadeIn 0.3s ease}.result-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:linear-gradient(135deg, var(--gray-50), #fafafa);border-bottom:1px solid var(--gray-200)}.result-header h3{font-size:1rem;display:flex;align-items:center;gap:8px}.result-actions{display:flex;gap:8px}.result-content{padding:20px;background:#1a1a2e;max-height:500px;overflow-y:auto}.result-pre{font-family:'Fira Code',monospace;font-size:0.85rem;color:#4ade80;white-space:pre-wrap;word-break:break-all;margin:0;line-height:1.6}.result-footer{padding:12px 20px;background:var(--gray-50);border-top:1px solid var(--gray-200);display:flex;gap:20px;font-size:0.7rem;color:var(--gray-500)}.validate-section{margin-bottom:24px;border:1px solid var(--gray-200);border-radius:16px;overflow:hidden}.validate-header{padding:12px 20px;background:var(--gray-50);cursor:pointer;display:flex;align-items:center;gap:8px;font-size:0.85rem;font-weight:500}.validate-header .toggle-icon{margin-left:auto;transition:transform 0.3s}.validate-header.open .toggle-icon{transform:rotate(180deg)}.validate-content{padding:16px 20px;border-top:1px solid var(--gray-200)}.validate-controls{display:flex;gap:12px;flex-wrap:wrap}.validate-result{margin-top:12px;padding:12px 16px;border-radius:12px}.validate-result.valid{background:#d1fae5;color:#065f46}.validate-result.invalid{background:#fee2e2;color:#991b1b}.reference-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:20px;margin-top:20px}.ref-card{background:var(--gray-50);border-radius:16px;padding:16px}.ref-card h4{font-size:0.85rem;margin-bottom:12px;color:var(--gray-700)}.ref-card ul{list-style:none;padding:0}.ref-card ul li{padding:4px 0;font-size:0.75rem;color:var(--gray-600);font-family:monospace}.knowledge-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:20px;margin-top:20px}.knowledge-card{background:var(--gray-50);border-radius:16px;padding:20px;text-align:center}.knowledge-card i{font-size:28px;color:var(--primary-color);margin-bottom:12px}.knowledge-card h4{font-size:0.85rem;margin-bottom:8px}.knowledge-card p{font-size:0.75rem;color:var(--gray-500);line-height:1.5}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (max-width:900px){.stats-grid{grid-template-columns:repeat(2, 1fr)}.reference-grid{grid-template-columns:repeat(2, 1fr)}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}}@media (max-width:600px){.stats-grid{grid-template-columns:1fr}.options-grid{grid-template-columns:1fr}.reference-grid{grid-template-columns:1fr}.knowledge-grid{grid-template-columns:1fr}.presets-buttons{flex-direction:column}}