/* CSS Variables */
:root {
  --color-primary: #007bff;
  --color-secondary: #6c757d;
  --color-success: #28a745;
  --color-danger: #dc3545;
  --color-warning: #ffc107;
  --color-info: #17a2b8;
  --color-light: #f8f9fa;
  --color-dark: #343a40;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray: #6c757d;
  --font-family: 'Arial', sans-serif;
  --transition-speed: 0.3s;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #375a7f;
    --color-secondary: #444444;
    --color-light: #343a40;
    --color-dark: #f8f9fa;
  }
}

body {
  font-family: var(--font-family);
  margin: 0;
  padding: 0;
  line-height: 1.5;
  color: var(--color-dark);
  background-color: var(--color-light);
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.form-group {
  margin-bottom: 1rem;
  width: 100%;
  max-width: 400px;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: bold;
}

input, select, button {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 0.5rem;
  border: 1px solid var(--color-gray);
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color var(--transition-speed);
}

input:focus, select:focus, button:focus {
  outline: none;
  border-color: var(--color-primary);
}

button {
  background-color: var(--color-primary);
  color: var(--color-white);
  cursor: pointer;
  transition: background-color var(--transition-speed);
}

button:hover {
  background-color: #0056b3; /* Adjusted for better browser compatibility */
}

button:active {
  background-color: #004085; /* Adjusted for better browser compatibility */
}

.error {
  color: var(--color-danger);
  font-size: 0.875rem;
  margin-top: -0.5rem;
  margin-bottom: 0.5rem;
}

.result {
  margin-top: 1rem;
  padding: 1rem;
  background-color: var(--color-light);
  border: 1px solid var(--color-gray);
  border-radius: 4px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.result p {
  margin: 0.5rem 0;
}

@media (min-width: 768px) {
  .container {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media print {
  body {
    color: var(--color-black);
    background-color: var(--color-white);
  }

  .container, .result {
    width: 100%;
    max-width: none;
  }

  button {
    display: none;
  }
}

@supports not (display: grid) {
  .container {
    display: block;
  }
}