.status background: #00000066; border-radius: 40px; padding: 0.6rem 1rem; text-align: center; font-family: monospace; font-size: 1.2rem; font-weight: bold; color: #c0e0ff; letter-spacing: 2px;

footer text-align: center; font-size: 0.7rem; margin-top: 1.5rem; opacity: 0.7; </style> </head> <body> <div class="card"> <h1>❤️ LUB DUB VALVES</h1> <div class="sub">atrioventricular → lub | semilunar → dub</div>

I'll assume you're asking for a related to a "lub dub valves" concept — likely a cardiac simulation, medical training tool, or interactive visualization of heart valves producing the "lub-dub" sound.

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

// ----- Animation & Valve Activation ----- const lubValveDiv = document.getElementById('lubValve'); const dubValveDiv = document.getElementById('dubValve'); const statusSpan = document.getElementById('statusMsg');

// helper: simple beep with decay (lub = lower freq, dub = higher + shorter) function playLub() if (audioCtx.state === 'suspended') audioCtx.resume(); const now = audioCtx.currentTime; const osc = audioCtx.createOscillator(); const gain = audioCtx.createGain(); osc.connect(gain); gain.connect(audioCtx.destination); osc.frequency.value = 85; // thud-like gain.gain.value = 0.45; gain.gain.exponentialRampToValueAtTime(0.0001, now + 0.35); osc.start(); osc.stop(now + 0.35); // extra low harmonic for "lub" richness const osc2 = audioCtx.createOscillator(); const gain2 = audioCtx.createGain(); osc2.connect(gain2); gain2.connect(audioCtx.destination); osc2.frequency.value = 170; gain2.gain.value = 0.2; gain2.gain.exponentialRampToValueAtTime(0.0001, now + 0.28); osc2.start(); osc2.stop(now + 0.28);

button:active transform: scale(0.96);