.glass-box {
  background: rgba(0, 0, 0, 0.35);     /* leichte Transparenz */
  border-radius: 20px;
  padding: 40px;
  border: 1px solid rgba(255, 255, 255, 0.15);

  backdrop-filter: blur(12px) brightness(1.2); 
  -webkit-backdrop-filter: blur(12px) brightness(1.2);

  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  max-width: 900px;
  margin: auto;
}