.container{max-width:800px;margin:0 auto;padding:20px;font-family:Arial,sans-serif}h1{text-align:center;color:#2c3e50}.calculator-section{background-color:#f8f9fa;border-radius:8px;padding:20px;margin-bottom:20px;box-shadow:0 2px 4px rgba(0,0,0,.1)}h2{color:#2c3e50;margin-top:0}.form-group{margin-bottom:15px}label{display:block;margin-bottom:5px;color:#495057}input{width:100%;padding:8px;border:1px solid #ced4da;border-radius:4px;font-size:16px}.input-group{display:flex;gap:10px}.input-group input{flex:1}.result{margin-top:15px;background-color:#e9ecef;font-weight:700}.offline-indicator,.result{padding:10px;border-radius:4px;text-align:center}.offline-indicator{background-color:#fff3cd;color:#856404;margin-bottom:20px;border:1px solid #ffeaa7}.install-prompt{background-color:#d1ecf1;color:#0c5460;padding:15px;border-radius:8px;margin-bottom:20px;display:flex;align-items:center;justify-content:space-between;border:1px solid #bee5eb;box-shadow:0 2px 4px rgba(0,0,0,.1)}.install-prompt span{flex:1;margin-right:15px}.install-btn{background-color:#4caf50;color:#fff;border:none;padding:8px 16px;border-radius:4px;cursor:pointer;font-size:14px;margin-right:10px}.install-btn:hover{background-color:#45a049}.dismiss-btn{background-color:#f8f9fa;color:#6c757d;border:1px solid #dee2e6;padding:8px 12px;border-radius:4px;cursor:pointer;font-size:16px;font-weight:700}.dismiss-btn:hover{background-color:#e9ecef}@media (max-width:768px){.install-prompt{flex-direction:column;text-align:center}.install-prompt span{margin-right:0;margin-bottom:10px}.dismiss-btn,.install-btn{margin:5px}}