.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:linear-gradient(135deg, #1a1a2e, #16213e);border-radius:24px;padding:32px;margin-bottom:30px}.converter-section{display:grid;grid-template-columns:1fr 1fr auto 1fr;gap:20px;align-items:end}.input-group label{display:block;font-size:0.8rem;color:var(--gray-400);margin-bottom:8px}.converter-input{width:100%;padding:12px 16px;border:1px solid var(--gray-700);border-radius:12px;background:rgba(255,255,255,0.05);color:white;font-size:1.1rem;font-family:'Fira Code',monospace}.converter-input:focus{outline:none;border-color:var(--primary-color)}.converter-select{width:100%;padding:12px 16px;border:1px solid var(--gray-700);border-radius:12px;background:rgba(255,255,255,0.05);color:white;font-size:0.95rem;cursor:pointer}.converter-select option{background:#1a1a2e}.swap-icon{display:flex;align-items:center;justify-content:center;padding-top:28px;cursor:pointer;color:var(--gray-500);font-size:1.5rem;transition:all 0.3s}.swap-icon:hover{color:var(--primary-color);transform:scale(1.1)}.result-section{text-align:center;margin-top:28px;padding:20px;border-top:1px solid var(--gray-700)}.result-value{font-size:3rem;font-weight:700;color:#4ade80;font-family:'Fira Code',monospace}.result-unit{font-size:1.2rem;color:var(--gray-400);margin-top:8px}.preset-buttons{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}.preset-btn{background:var(--gray-100);border:1px solid var(--gray-300);padding:8px 20px;border-radius:40px;cursor:pointer;font-size:0.8rem;transition:all 0.2s}.preset-btn:hover{background:var(--primary-color);border-color:var(--primary-color);color:white}.table-wrapper{overflow-x:auto;margin-top:16px}.conversion-table{width:100%;border-collapse:collapse;font-size:0.85rem}.conversion-table th,.conversion-table td{padding:10px 14px;text-align:center;border:1px solid var(--gray-200)}.conversion-table th{background:var(--gray-100);font-weight:600}.conversion-table tr:nth-child(even){background:var(--gray-50)}.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:900px){.stats-grid{grid-template-columns:repeat(2, 1fr)}.converter-section{grid-template-columns:1fr;gap:16px}.swap-icon{padding-top:0;transform:rotate(90deg)}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}}@media (max-width:600px){.stats-grid{grid-template-columns:1fr}.converter-main{padding:20px}.result-value{font-size:2rem}.knowledge-grid{grid-template-columns:1fr}}