body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Segoe UI', Arial, sans-serif;
  
  /* Superposition de dégradés pour le fond et les bulles */
  background-image:
    radial-gradient(circle at 15% 85%, rgba(144, 205, 244, 0.7) 0%, transparent 40%),
    radial-gradient(circle at 75% 25%, rgba(251, 182, 206, 0.7) 0%, transparent 40%),
    radial-gradient(circle at 40% 60%, rgba(183, 148, 244, 0.7) 0%, transparent 40%),
    linear-gradient(to bottom, #f5f7fa 0%, #d1d5db 100%);

  background-attachment: fixed;
  background-repeat: no-repeat;
}
main {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 2.5rem auto 2rem auto;
  background: rgba(255,255,255,0.95);
  border-radius: 24px;
  box-shadow: 0 8px 32px #0002;
  padding: 2.5rem 2rem 2rem 2rem;
  backdrop-filter: blur(2px);
}

h1 {
  text-align: center;
  margin-top: 0;
  margin-bottom: 2rem;
  font-size: 2.5rem;
  color: #2b6cb0;
  letter-spacing: 1px;
  text-shadow: 0 2px 8px #90cdf455;
}

@media (max-width: 700px) {
  main {
    padding: 1rem 0.5rem;
    margin: 1rem 0;
  }
  h1 {
    font-size: 1.3rem;
  }
}