:root {
  color-scheme: dark;
  --bg: #050505;
  --wave: #57ff9a;
  --wave-dim: rgba(87, 255, 154, 0.16);
  --button-bg: rgba(15, 15, 15, 0.9);
  --button-border: rgba(87, 255, 154, 0.45);
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: radial-gradient(circle at center, #0d1b14 0%, var(--bg) 55%, #000 100%);
}

body {
  position: relative;
  font-family: Arial, Helvetica, sans-serif;
}

#visualizer {
  display: block;
  width: 100vw;
  height: 100vh;
}

#startButton {
  position: fixed;
  inset: auto auto 24px 24px;
  padding: 12px 16px;
  border: 1px solid var(--button-border);
  border-radius: 999px;
  background: var(--button-bg);
  color: white;
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

#startButton:hover {
  border-color: var(--wave);
}

#startButton:disabled {
  opacity: 0;
  pointer-events: none;
}