.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background-color: #f6f6f6;
}

.display-area {
  flex: 1;
  background-color: #fff;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
}

.chain-text {
  font-size: 18px;
  color: #666;
  margin-bottom: 20px;
  word-break: break-all;
  text-align: right;
}

.result-text {
  font-size: 32px;
  color: #333;
  font-weight: bold;
}

.control-area {
  background-color: #e0e0e0;
  padding: 10px;
  padding-bottom: 40px; /* Safe area for some phones */
}

.action-bar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.action-btn {
  background-color: #f8f8f8;
  color: #f00;
  width: 48%;
}

.grid-keyboard {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}

.key-btn {
  background-color: #fff;
  height: 60px;
  line-height: 60px;
  text-align: center;
  font-size: 18px;
  border-radius: 5px;
  padding: 0;
}