body {
  margin: 0;
  background: #0a0a0f;
  color: #e0e0e0;
  font-family: monospace;
}

header {
  text-align: center;
  padding: 20px;
  border-bottom: 1px solid #222;
}

h1 {
  color: #00ffcc;
  margin: 0;
}

#store {
  padding: 20px;
}

.app {
  background: #111;
  border: 1px solid #222;
  border-radius: 12px;
  padding: 15px;
  margin-bottom: 15px;
}

.app h2 {
  margin: 0 0 5px 0;
}

button {
  background: #00ffcc;
  color: #000;
  border: none;
  padding: 8px 14px;
  font-weight: bold;
  cursor: pointer;
  border-radius: 6px;
}

button:hover {
  background: #00ccaa;
}