body {
  margin: 0;
  background: linear-gradient(#1e3c72, #2a5298);
  font-family: Arial, sans-serif;
  color: white;
  text-align: center;
}

.tabs {
  display: flex;
  background: rgba(0,0,0,0.25);
}

.tabs button {
  flex: 1;
  padding: 14px;
  background: transparent;
  border: none;
  color: white;
  font-size: 18px;
}

.tabs button:hover {
  background: rgba(255,255,255,0.06);
}

.tab {
  display: none;
  padding: 18px;
}

.tab.active {
  display: block;
}

#melon {
  width: 260px;
  max-width: 80%;
  image-rendering: auto;
  cursor: pointer;
  transition: transform 0.08s ease;
  margin-top: 8px;
}

#melon.clicked {
  transform: scale(0.92);
}

.counter {
  font-size: 24px;
  margin-top: 6px;
}

.panel {
  background: rgba(255,255,255,0.06);
  padding: 12px;
  border-radius: 10px;
  margin: 8px auto;
  max-width: 520px;
}

button.upgrade {
  width: 100%;
  padding: 12px;
  margin: 8px 0;
  font-size: 16px;
  border-radius: 8px;
  border: none;
  background: linear-gradient(#4facfe,#00f2fe);
  color: #012;
}