:root {
    --bg: #050505;
    --primary: #ff0055;
    --text: #ffffff;
    --font: 'Syncopate', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--bg); color: var(--text); font-family: var(--font); overflow: hidden; height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; }
body.flash { background: #ffffff; color: #000000; }

.bass-ring {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 0; height: 0; border: 2px solid var(--primary); border-radius: 50%;
    opacity: 0; pointer-events: none;
}
body.boom .bass-ring { animation: ripple 1s ease-out; }
body.boom .bass-ring.delay-1 { animation-delay: 0.1s; }
body.boom .bass-ring.delay-2 { animation-delay: 0.2s; }
@keyframes ripple {
    0% { width: 0; height: 0; opacity: 1; border-width: 20px; }
    100% { width: 100vw; height: 100vw; opacity: 0; border-width: 1px; }
}

.container { position: relative; z-index: 10; }
h1 { font-size: 6rem; text-transform: uppercase; letter-spacing: -2px; margin-bottom: 1rem; cursor: pointer; transition: 0.1s; }
.subtitle { font-size: 1.2rem; letter-spacing: 5px; color: #888; margin-bottom: 3rem; }

.shake-extreme:hover { animation: shake 0.1s infinite; color: var(--primary); text-shadow: 0 0 20px var(--primary); }
body.flash .shake-extreme { color: #000; text-shadow: none; }
@keyframes shake {
    0% { transform: translate(5px, 5px) rotate(0deg); }
    20% { transform: translate(-5px, -5px) rotate(-1deg); }
    40% { transform: translate(5px, -5px) rotate(1deg); }
    60% { transform: translate(-5px, 5px) rotate(0deg); }
    80% { transform: translate(5px, 0px) rotate(1deg); }
    100% { transform: translate(-5px, 0px) rotate(-1deg); }
}

.btn-play {
    background: transparent; color: var(--primary); border: 2px solid var(--primary);
    padding: 1rem 3rem; font-family: var(--font); font-size: 1.5rem; cursor: pointer;
    text-transform: uppercase; transition: 0.2s; position: relative; overflow: hidden;
}
.btn-play:hover { background: var(--primary); color: var(--bg); box-shadow: 0 0 30px var(--primary); }

.equalizer { position: absolute; bottom: 0; left: 0; width: 100%; height: 100px; display: flex; align-items: flex-end; justify-content: space-around; opacity: 0.2; pointer-events: none; }
.bar { flex: 1; margin: 0 2px; background: var(--primary); height: 10px; transition: height 0.05s; }
body.boom .equalizer { opacity: 0.8; }