body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f0f0f0;
}

h1 {
  color: #333;
}

.coin {
  width: 120px;
  height: 120px;
  background: gold;
  border-radius: 50%;
  display: inline-block;
  line-height: 120px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  font-size: 40px;
}

.stats, .shop, .boxes, .inventory {
  margin-top: 20px;
  padding: 10px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  width: 80%;
  margin-left: auto;
  margin-right: auto;
}

button {
  margin: 5px;
  padding: 10px 20px;
  cursor: pointer;
}

.log {
  margin-top: 20px;
  background: #fff;
  padding: 10px;
  border-radius: 8px;
  height: 150px;
  overflow-y: auto;
  text-align: left;
}

.common { color: gray; }
.rare { color: blue; }
.epic { color: purple; }