* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
  font-family: system-ui, sans-serif;

  /* Ciel nocturne */
  background: radial-gradient(circle at top, #1e293b 0, #020617 55%, #000 100%);
  color: #fff;
}

/* Canvas plein écran derrière le contenu */
#snow-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.message-box {
  background: rgba(15, 23, 42, 0.85);
  padding: 40px;
  border-radius: 14px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  z-index: 1;
  text-align: center;
}

h1 {
  font-size: 2.2rem;
}

@media (max-width: 480px) {
  .message-box {
    padding: 26px 20px;
  }

  h1 {
    font-size: 1.7rem;
  }

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at center,
      transparent 0%,
      transparent 50%,
      rgba(0,0,0,0.35) 100%);
}

}