body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background: #f5f5f5;
}

.calculator {
  max-width: 700px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
}

h1 { text-align: center; color: #333; }
h2, h3 { margin-top: 20px; color: #444; }

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.row label {
  flex: 1;
  margin-right: 10px;
}

.row input {
  width: 150px;
  padding: 6px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  padding: 10px 20px;
  background: #0073aa;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 10px;
}

button:hover { background: #005f8d; }

.table-container {
  overflow-x: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 20px;
}

.results-table td {
  padding: 8px;
  border: 1px solid #ddd;
  font-size: 1.1em;
}

.results-table td:first-child {
  font-weight: 500;
  background: #f9f9f9;
  width: 65%;
}

.results-table td:last-child {
  text-align: right;
  font-family: monospace;
}

.footer {
  text-align: center;
  margin-top: 30px;
  font-size: 0.9em;
  color: #666;
}

@media (max-width: 600px) {
  .row {
    flex-direction: column;
    align-items: stretch;
  }
  .row label {
    margin-bottom: 5px;
  }
  .row input {
    width: 100%;
  }
  button {
    width: 100%;
    margin-bottom: 10px;
  }
}