:root {
    --primary-color: #005A9C;
    --secondary-color: #f4f4f4;
    --text-color: #333;
    --results-bg: #eef7ff;
    --export-color: #00796b;
    --border-radius: 8px;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}
body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}
.calculator-container {
    background: #fff;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 500px;
    width: 100%;
    margin: 20px auto;
}
header {
    text-align: center;
    margin-bottom: 25px;
}
header h1 {
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 700;
}
.input-group {
    margin-bottom: 20px;
}
.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}
.input-group input,
.input-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    box-sizing: border-box;
    font-size: 1rem;
}
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type=number] {
  -moz-appearance: textfield;
}
.calculate-btn {
    width: 100%;
    padding: 15px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}
.calculate-btn:hover {
    background-color: #004170;
}
#results-container {
    margin-top: 30px;
    padding: 20px;
    background-color: var(--results-bg);
    border: 1px dashed var(--primary-color);
    border-radius: var(--border-radius);
}
#results-container.hidden {
    display: none;
}
#export-area h2 {
    text-align: center;
    color: var(--primary-color);
    margin-top: 0;
}
#results table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}
#results td {
    padding: 8px 4px;
    font-size: 1rem;
}
#results td:last-child {
    text-align: right;
    font-weight: 500;
}
#results tr.total td {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color);
    padding-top: 15px;
    border-top: 1px solid #ccc;
}
.results-disclaimer {
    font-size: 0.8rem;
    margin-top: 15px;
    color: #555;
    text-align: left;
}
.export-btn {
    margin-top: 20px;
    background-color: var(--export-color);
}
.export-btn:hover {
    background-color: #004d40;
}

@media print {
  body * {
    visibility: hidden;
  }
  #export-area, #export-area * {
    visibility: visible;
  }
  #export-area {
    position: absolute;
    left: 0;
    top: 0;
    margin: 0.5in;
    padding: 0;
    width: calc(100% - 1in);
    border: none;
    box-shadow: none;
    font-size: 10pt;
  }
  #export-area h2 {
    font-size: 16pt;
  }
  #results td {
    padding: 6px 4px;
    font-size: 10pt;
  }
  #results tr.total td {
    font-size: 12pt;
  }
  .results-disclaimer {
    font-size: 8pt;
  }
  #export-btn {
    display: none;
  }
}