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.valves-container display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap; margin-bottom: 2rem;

function activateDub() dubValveDiv.classList.add('active'); setTimeout(() => dubValveDiv.classList.remove('active'), 180);

// combined lub-dub with timing function playLubDub() playLub(); activateLub(); statusSpan.innerHTML = '❤️ LUB (S1) – AV valves close'; setTimeout(() => playDub(); activateDub(); statusSpan.innerHTML = '💙 DUB (S2) – Semilunar valves close'; , 220); // natural split between lub & dub