body {
  margin: 0;
  font-family: Arial, sans-serif;

  /* Sandplatz-Theme */
  background: url("pictures/background_grass.jpg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  color: #fff;

  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}

/* Hauptbox */
.container {
  text-align: center;
  padding: 40px;
  border: 3px solid #ffd1b3;
  border-radius: 20px;
  background: rgba(60, 20, 10, 0.35);
  box-shadow: 0 0 25px rgba(0,0,0,0.5);
  max-width: 520px;
  backdrop-filter: blur(3px);
}

/* Titel */
h1 {
  font-size: 2.7rem;
  margin-bottom: 10px;
  color: #ffe3d1;
  text-shadow: 0 0 12px rgba(0,0,0,0.6);
}

/* Text */
p {
  font-size: 1.1rem;
  margin-bottom: 30px;
  color: #ffe8dc;
}

/* Sandplatzlinie */
.court-line {
  width: 100%;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    #ffd1b3,
    #ffd1b3 12px,
    transparent 12px,
    transparent 22px
  );
  margin: 20px 0;
  opacity: 0.9;
}

/* Button */
button {
  background: #ff5a2a;
  border: none;
  padding: 15px 32px;
  font-size: 1.2rem;
  font-weight: bold;
  border-radius: 50px;
  cursor: pointer;
  transition: 0.25s;
  color: white;
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
}

button:hover {
  transform: scale(1.08);
  background: #ff7a4d;
}

/* Tennisball */
.ball {
  width: 65px;
  height: 65px;
  background: radial-gradient(circle at 30% 30%, #ffffff, #d7ff3f);
  border-radius: 50%;
  position: absolute;
  top: 25px;
  right: 25px;
  animation: bounce 2s infinite;
  box-shadow: 0 0 15px rgba(0,0,0,0.4);
}

/* Bounce Animation */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(28px); }
}

/* Sandstaub Effekt */
.dust {
  position: absolute;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.06) 1px, transparent 2px);
  background-size: 20px 20px;
  opacity: 0.25;
  pointer-events: none;
}