/*
 * Styles communs : palette, écrans plein cadre, boutons ronds et réglages du son.
 * Les trois écrans sont empilés ; un seul est visible à la fois (attribut hidden).
 */
:root {
  --bg-purple-dark: #2a1f45;
  --purple-primary: #a884f3;
  --purple-light: #e0d5f7;
  --glass-bg: rgba(62, 47, 91, .65);
  --white-off: #fffcf2;
  --text-dark: #3e2f5b;
  --pink: #ff69b4;
  --crimson: #dc143c;
  --pixel-font: "VT323", monospace;
  --radius-pixel: 12px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background-color: #1a1a1a;
  overflow: hidden;
}

.screen {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
}
.screen[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

button { font: inherit; }
button:focus-visible,
input:focus-visible,
[role="slider"]:focus-visible {
  outline: 3px solid var(--pink);
  outline-offset: 3px;
}

.round-btn {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  padding: 0;
  border-radius: 50%;
  cursor: pointer;
  transition: transform .2s, background .2s;
}
.round-btn:hover { transform: scale(1.1); }
.round-btn:active { transform: scale(.95); }

/* Réglages du son : bouton muet, panneau de volumes au survol ou au focus clavier */
.volume-control {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: row-reverse;
  align-items: center;
  gap: 15px;
}
.mute-btn {
  position: static;
  color: #fff;
  font-size: 1.5rem;
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .2);
  box-shadow: 0 4px 6px rgba(0, 0, 0, .1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.mute-btn:hover { background: rgba(255, 255, 255, .2); }
.volume-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, .3);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  opacity: 0;
  visibility: hidden;
  transform: translateX(10px);
  transition: all .3s cubic-bezier(.4, 0, .2, 1);
}
.volume-control:hover .volume-panel,
.volume-control:focus-within .volume-panel {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}
.slider-group {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-size: 1.2rem;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100px;
  height: 4px;
  background: rgba(168, 132, 243, .3);
  border-radius: 2px;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--purple-primary);
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 5px rgba(0, 0, 0, .5);
}
input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--purple-primary);
  border: 2px solid #fff;
  border-radius: 50%;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}