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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(to right, #000011, #000033);
  color: #00eaff;
  text-align: center;
  min-height: 100vh;
}

.screen {
  padding: 20px;
}

h1, h2, h3 {
  text-shadow: 0 0 10px #00eaff;
}

input[type="text"],
input[type="password"] {
  padding: 10px;
  margin: 10px 0;
  width: 200px;
  border: 1px solid #00eaff;
  background-color: rgba(0, 234, 255, 0.1);
  color: #00eaff;
  border-radius: 4px;
}

button {
  padding: 10px 20px;
  margin: 5px;
  background-color: #00eaff;
  color: #000;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
}

button:hover {
  background-color: #00aadd;
  transform: scale(1.05);
}

.game-area {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin: 20px auto;
  max-width: 900px;
}

.planet, .galaxy {
  background-color: rgba(0, 234, 255, 0.1);
  padding: 20px;
  border-radius: 10px;
  border: 1px solid #00eaff;
  width: 45%;
  min-width: 300px;
}

#stars {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin: 10px 0;
}

.star {
  width: 80px;
  padding: 10px;
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px dashed #aaa;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.3s;
}

.star:hover {
  background-color: rgba(255, 255, 255, 0.2);
  border-color: #fff;
}

.star.owned {
  border-color: #00eaff;
  background-color: rgba(0, 234, 255, 0.2);
  color: #00eaff;
}

#message-box {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 10px 20px;
  border-radius: 5px;
  color: white;
  z-index: 1000;
  display: none;
  animation: slideIn 0.3s ease-out;
}

#message-box.success {
  background-color: #28a745;
}

#message-box.error {
  background-color: #dc3545;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.footer {
  margin-top: 40px;
  font-size: 12px;
  color: #00aadd;
}