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

body {
  font-family: 'Noto Sans', sans-serif;
  background: #000;
  color: #fff;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.container {
  width: 100%;
  max-width: 500px;
}

.input-section {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}

#generateBtn {
  padding: 20px 40px;
  font-size: 18px;
  font-weight: 600;
  background: #fff;
  color: #000;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
}

#generateBtn:hover {
  opacity: 0.9;
}

#generateBtn:active {
  transform: scale(0.98);
}

.result {
  background: #111;
  border: 2px solid #333;
  border-radius: 12px;
  padding: 24px;
  transition: opacity 0.3s, transform 0.3s;
}

.result.hidden {
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
}

.item-name {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid #333;
}

.surcharge-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #222;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.surcharge-name {
  flex: 1;
  font-size: 14px;
  color: #ccc;
}

.surcharge-amount {
  font-weight: 600;
  color: #fff;
}

.total-section {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 2px solid #333;
}

.subtotal {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 14px;
  color: #999;
}

.total {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 20px;
  font-weight: 700;
}