.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)}.converter-main{background:var(--gray-50);border-radius:20px;padding:24px;margin-bottom:24px}.input-section{margin-bottom:16px}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;flex-wrap:wrap;gap:12px}.section-header h3{font-size:1rem;display:flex;align-items:center;gap:8px}.input-actions{display:flex;gap:8px}.input-wrapper,.output-wrapper{display:flex;gap:12px;align-items:center}.value-input,.result-input{flex:1;padding:14px 18px;border:1px solid var(--gray-300);border-radius:16px;font-size:1.2rem;font-family:'Fira Code',monospace;min-width:0}.value-input:focus,.result-input:focus{outline:none;border-color:var(--primary-color)}.result-input{background:#1a1a2e;color:#4ade80}.unit-select{padding:12px 16px;border:1px solid var(--gray-300);border-radius:12px;background:white;font-size:0.95rem;min-width:80px}.swap-section{text-align:center;margin:8px 0 16px}.swap-btn{width:48px;height:48px;border-radius:50%;border:2px solid var(--gray-300);background:white;cursor:pointer;transition:all 0.3s;font-size:1.2rem;color:var(--gray-600)}.swap-btn:hover{border-color:var(--primary-color);background:var(--primary-color);color:white;transform:rotate(180deg)}.output-section{margin-top:4px}.output-actions{display:flex;gap:8px}.quick-section{margin-bottom:24px}.quick-buttons{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.quick-btn{background:var(--gray-100);border:1px solid var(--gray-300);padding:8px 16px;border-radius:40px;cursor:pointer;font-size:0.8rem;transition:all 0.2s}.quick-btn:hover{background:var(--primary-color);border-color:var(--primary-color);color:white}.reference-section{margin-bottom:24px}.ref-table-wrapper{margin-top:12px;overflow-x:auto}.ref-table{width:100%;border-collapse:collapse;font-size:0.85rem}.ref-table th,.ref-table td{padding:10px 12px;text-align:center;border:1px solid var(--gray-200)}.ref-table th{background:var(--gray-50);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}@media (max-width:600px){.stats-grid{grid-template-columns:1fr}.input-wrapper,.output-wrapper{flex-direction:column}.value-input,.result-input{width:100%}.unit-select{width:100%}.quick-buttons{flex-direction:column}.knowledge-grid{grid-template-columns:1fr}}@media (max-width:900px){.stats-grid{grid-template-columns:repeat(2, 1fr)}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}}