.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)}.input-section{background:var(--gray-50);border-radius:24px;padding:24px;margin-bottom:30px}.input-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:20px}.input-group label{display:block;font-weight:600;margin-bottom:8px;color:var(--gray-700);font-size:0.85rem}.mask-input-group{display:flex;gap:12px}.cidr-select{width:120px;padding:12px;border:1px solid var(--gray-300);border-radius:12px;background:white}.action-buttons{display:flex;gap:12px;justify-content:flex-end}.calc-btn{padding:10px 28px}.result-section{animation:fadeIn 0.3s ease}.info-cards{display:grid;grid-template-columns:repeat(4, 1fr);gap:16px;margin-bottom:24px}.info-card{background:linear-gradient(135deg, #f8fafc, #fff);border-radius:16px;padding:16px;display:flex;align-items:center;gap:12px;border:1px solid var(--gray-200);transition:all 0.2s}.info-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-sm)}.card-icon{width:40px;height:40px;background:var(--gray-100);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--primary-color)}.card-content{flex:1;position:relative}.card-label{font-size:0.7rem;color:var(--gray-500);display:block}.card-value{font-family:'Fira Code',monospace;font-size:0.9rem;font-weight:600;color:var(--gray-800);word-break:break-all;padding-right:30px}.copy-value{position:absolute;right:0;top:50%;transform:translateY(-50%);background:transparent;border:none;color:var(--gray-500);cursor:pointer;padding:4px 6px;border-radius:6px}.copy-value:hover{background:var(--gray-200);color:var(--primary-color)}.detail-section{background:var(--gray-50);border-radius:16px;padding:20px;margin-bottom:24px}.detail-section h4{font-size:0.9rem;margin-bottom:16px;color:var(--gray-700);display:flex;align-items:center;gap:8px}.detail-grid{display:grid;grid-template-columns:repeat(2, 1fr);gap:12px}.detail-item{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid var(--gray-200)}.detail-label{font-size:0.8rem;color:var(--gray-500)}.detail-value{font-family:'Fira Code',monospace;font-size:0.8rem;font-weight:500;color:var(--gray-800)}.visual-section{background:var(--gray-50);border-radius:16px;padding:20px;margin-bottom:24px}.visual-section h4{font-size:0.9rem;margin-bottom:16px;color:var(--gray-700)}.visual-bar{display:flex;height:40px;border-radius:8px;overflow:hidden;margin-bottom:16px}.network-part{background:linear-gradient(90deg, #3b82f6, #60a5fa);display:flex;align-items:center;justify-content:flex-start;padding-left:12px;color:white;font-size:0.7rem}.host-part{background:linear-gradient(90deg, #10b981, #34d399);display:flex;align-items:center;justify-content:flex-end;padding-right:12px;color:white;font-size:0.7rem}.visual-legend{display:flex;gap:24px;justify-content:center}.legend-network,.legend-host{display:inline-block;width:16px;height:16px;border-radius:4px;margin-right:6px;vertical-align:middle}.legend-network{background:#3b82f6}.legend-host{background:#10b981}.subnet-section{background:var(--gray-50);border-radius:16px;padding:20px;margin-bottom:24px}.subnet-section h4{font-size:0.9rem;margin-bottom:16px;color:var(--gray-700)}.subnet-controls{display:flex;align-items:center;gap:16px;margin-bottom:16px;flex-wrap:wrap}.subnet-input{width:80px;padding:6px 10px;border:1px solid var(--gray-300);border-radius:8px;text-align:center}.subnet-table-wrapper{overflow-x:auto}.subnet-table{width:100%;border-collapse:collapse;font-size:0.8rem}.subnet-table th,.subnet-table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--gray-200)}.subnet-table th{background:var(--gray-100);font-weight:600}.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:1000px){.stats-grid{grid-template-columns:repeat(2, 1fr)}.info-cards{grid-template-columns:repeat(2, 1fr)}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}}@media (max-width:768px){.input-grid{grid-template-columns:1fr}.detail-grid{grid-template-columns:1fr}.action-buttons{justify-content:center}.mask-input-group{flex-direction:column}.cidr-select{width:100%}}@media (max-width:600px){.stats-grid{grid-template-columns:1fr}.info-cards{grid-template-columns:1fr}.knowledge-grid{grid-template-columns:1fr}}