:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #f59e0b;
  --light: #f8fafc;
  --dark: #1e293b;
  --gray: #64748b;
  --gray-light: #e2e8f0;
  --success: #10b981;
  --border-radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --transition: all 0.3s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Courier New", "SF Mono", Monaco, Inconsolata, "Roboto Mono",
    monospace;
}

body {
  background: linear-gradient(135deg, #dbeafe, #eff6ff);
  color: var(--dark);
  min-height: 100vh;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.main-container {
  width: 100%;
  max-width: 1200px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container {
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 30px;
  width: 100%;
  max-width: 600px;
  margin-bottom: 20px;
  transition: var(--transition);
}

.container:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

h1 {
  text-align: center;
  color: var(--primary);
  margin-bottom: 25px;
  font-size: 28px;
  border-bottom: 2px solid var(--secondary);
  padding-bottom: 10px;
}

.input-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--dark);
  font-size: 15px;
}

input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-light);
  border-radius: var(--border-radius);
  font-size: 16px;
  transition: var(--transition);
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.result {
  background: var(--light);
  padding: 20px;
  border-radius: var(--border-radius);
  margin-top: 25px;
  border: 1px solid var(--gray-light);
}

.result-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 15px;
  text-align: center;
}

.result-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--gray-light);
}

.result-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.result-item.highlight {
  font-weight: 700;
  color: var(--primary);
  font-size: 17px;
}

.result-item.total {
  background-color: rgba(37, 99, 235, 0.05);
  padding: 12px;
  border-radius: 8px;
  margin-top: 10px;
  border: 1px solid var(--primary);
}

button {
  display: block;
  width: 100%;
  max-width: 600px;
  padding: 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

.info-text {
  font-size: 14px;
  color: var(--gray);
  margin-top: 5px;
  font-style: italic;
}

/* Receipt Styles */
.receipt-container {
  position: fixed;
  top: -1000px;
  left: -1000px;
}

.receipt {
  width: 300px;
  background: white;
  padding: 20px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  border: 1px solid #ddd;
}

.receipt-header {
  text-align: center;
  margin-bottom: 15px;
}

.receipt-title {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 5px;
  color: #000;
}

.receipt-subtitle {
  font-size: 14px;
  margin-bottom: 8px;
  color: #666;
}

.receipt-date {
  font-size: 12px;
  color: #888;
  margin-bottom: 10px;
}

.receipt-divider {
  text-align: center;
  margin: 10px 0;
  font-size: 12px;
  color: #000;
  letter-spacing: -1px;
}

.receipt-section {
  margin: 15px 0;
}

.receipt-item {
  margin: 8px 0;
  display: flex;
  flex-direction: column;
}

.receipt-item span:first-child {
  font-weight: bold;
}

.receipt-item span:nth-child(2) {
  font-size: 11px;
  color: #666;
  margin-left: 10px;
}

.receipt-amount {
  align-self: flex-end;
  margin-top: 2px;
  font-weight: bold;
}

.receipt-total-line {
  display: flex;
  justify-content: space-between;
  margin: 6px 0;
  font-size: 13px;
}

.receipt-grand-total {
  display: flex;
  justify-content: space-between;
  margin: 15px 0;
  font-size: 16px;
  font-weight: bold;
  padding-top: 10px;
  border-top: 2px dashed #000;
}

.receipt-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 11px;
  color: #666;
  line-height: 1.4;
}

@media (max-width: 768px) {
  body {
    padding: 15px;
  }

  .container {
    padding: 20px;
  }

  h1 {
    font-size: 24px;
  }

  input {
    padding: 10px 12px;
    font-size: 15px;
  }

  button {
    padding: 12px;
  }

  .receipt {
    width: 280px;
    padding: 15px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 15px;
  }

  h1 {
    font-size: 22px;
  }

  .result-item {
    flex-direction: column;
  }

  .result-item span:first-child {
    margin-bottom: 5px;
  }

  .result-item span:last-child {
    font-weight: 600;
  }

  .receipt {
    width: 260px;
    padding: 12px;
  }

  .receipt-title {
    font-size: 18px;
  }
}