body {
  margin: 0;
  background: #ffffff;
  font-family: 'Courier New', monospace;
  color: #000;
}

.header {
  background: #E7584F;
  text-align: center;
  font-size: 24px;
  font-weight: bold;
  padding: 15px;
  border-bottom: 2px solid #000;
}

.container {
  padding: 20px;
  max-width: 500px;
  margin: auto;
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 15px 0;
}

.button {
  background: #f0f0f0;
  padding: 15px;
  border-radius: 10px;
  font-size: 18px;
  cursor: pointer;
}

.button.active {
  background: #bf2117 !important;
  color: white !important;
  font-weight: bold;
}

.energy-box, .transactions-box {
  border: 2px solid black;
  border-radius: 12px;
  padding: 10px;
  margin: 10px 0;
  font-size: 20px;
  font-weight: bold;
}

.note {
  background: #ee8a83;
  font-size: 13px;
  padding: 10px;
  border-radius: 10px;
  margin: 15px 0;
}

.discount {
  font-size: 15px;
  margin-bottom: 20px;
}

.discount .old {
  text-decoration: line-through;
  color: #999;
}

.discount .new {
  color: #c2251c;
  font-weight: bold;
}

.cost {
  font-size: 22px;
  font-weight: bold;
  color: #c2251c;
  margin-top: 20px;
}