// Helper: update display based on current mode and input value function update() let rawValue = kgInput.value.trim(); if (rawValue === "") rawValue = "0"; let numericValue = parseFloat(rawValue); if (isNaN(numericValue)) numericValue = 0;
.sub font-size: 0.9rem; color: #2c5a2e; border-left: 4px solid #3b8b4e; padding-left: 12px; margin-top: 6px; margin-bottom: 28px; font-weight: 500;
<div style="display: flex; justify-content: center;"> <button class="swap-btn" id="swapButton">🔄 Swap to Viss → KG</button> </div>
// Listen to input changes kgInput.addEventListener('input', update);
