.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)}.shape-selector{display:flex;gap:12px;margin-bottom:24px;flex-wrap:wrap;border-bottom:1px solid var(--gray-200);padding-bottom:12px}.shape-btn{background:transparent;border:none;padding:10px 24px;border-radius:40px;cursor:pointer;font-size:0.9rem;transition:all 0.2s;color:var(--gray-600)}.shape-btn i{margin-right:8px}.shape-btn.active{background:var(--primary-color);color:white}.calc-section{background:var(--gray-50);border-radius:20px;padding:24px;margin-bottom:24px}.calc-section .input-group{margin-bottom:16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}.calc-section .input-group label{width:140px;font-weight:500;color:var(--gray-700)}.calc-input{flex:1;min-width:150px;padding:10px 16px;border:1px solid var(--gray-300);border-radius:12px;font-size:1rem}.calc-input:focus{outline:none;border-color:var(--primary-color)}.input-unit{color:var(--gray-500);font-weight:500}.calc-btn{width:100%;padding:12px;font-size:1rem}.result-section{background:white;border-radius:20px;border:1px solid var(--gray-200);overflow:hidden;animation:fadeIn 0.3s ease;margin-bottom:24px}.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-grid{display:grid;grid-template-columns:repeat(3, 1fr);gap:16px;padding:20px}.result-card{text-align:center;padding:16px;background:var(--gray-50);border-radius:16px}.result-card.primary{background:linear-gradient(135deg, #1a1a2e, #16213e)}.result-card.primary .result-label{color:var(--gray-400)}.result-card.primary .result-value{color:#4ade80}.result-card.primary .result-unit{color:var(--gray-400)}.result-label{font-size:0.7rem;color:var(--gray-500);margin-bottom:8px}.result-value{font-size:1.4rem;font-weight:700;color:var(--gray-800)}.result-value.highlight{color:var(--primary-color);font-size:1.8rem}.result-unit{font-size:0.7rem;color:var(--gray-500);margin-top:4px}.result-detail{padding:16px 20px;border-top:1px solid var(--gray-200)}.result-detail h4{font-size:0.85rem;margin-bottom:12px;color:var(--gray-700)}.detail-content{display:grid;grid-template-columns:repeat(2, 1fr);gap:8px}.detail-item{display:flex;justify-content:space-between;padding:6px 12px;background:var(--gray-50);border-radius:8px;font-size:0.8rem}.detail-item .label{color:var(--gray-500)}.detail-item .value{font-weight:500}.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)}.result-grid{grid-template-columns:repeat(2, 1fr)}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}.calc-section .input-group{flex-direction:column;align-items:stretch}.calc-section .input-group label{width:auto}}@media (max-width:600px){.stats-grid{grid-template-columns:1fr}.result-grid{grid-template-columns:1fr}.shape-selector{flex-direction:column}.detail-content{grid-template-columns:1fr}.knowledge-grid{grid-template-columns:1fr}}