/* Dark mode toggle button */
.theme-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1000;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #333;
  transition: color 0.2s ease;
}

.theme-toggle:hover {
  color: #1772d0;
}

/* Light mode (default) */
:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --link-color: #1772d0;
  --link-hover-color: #f5b461;
  --border-color: #e0e0e0;
}

/* Dark mode */
[data-theme="dark"] {
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --link-color: #4a9eff;
  --link-hover-color: #ffb366;
  --border-color: #404040;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.2s ease, color 0.2s ease;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:focus, a:hover {
  color: var(--link-hover-color);
  text-decoration: none;
}

body,td,th {
  font-family: 'Source Sans Pro', Arial, sans-serif;
  font-size: 16px;
  font-weight: 400;
  color: var(--text-color);
  transition: color 0.2s ease;
}

heading {
  font-family: 'Source Sans Pro', Arial, sans-serif;
  font-size: 19px;
  font-weight: 600;
  color: var(--text-color);
  transition: color 0.2s ease;
}

strong {
  font-family: 'Source Sans Pro', Arial, sans-serif;
  font-size: 16px;
  font-weight: 800;
  color: var(--text-color);
  transition: color 0.2s ease;
}

strongred {
  font-family: 'Source Sans Pro', Arial, sans-serif;
  color: 'red' ;
  font-size: 16px
}

sectionheading {
  font-family: 'Source Sans Pro', Arial, sans-serif;
  font-size: 22px;
  font-weight: 600;
  color: var(--text-color);
  transition: color 0.2s ease;
}

pageheading {
  font-family: 'Source Sans Pro', Arial, sans-serif;
  font-size: 60px;
  font-weight: 400;
  color: var(--text-color);
  transition: color 0.2s ease;
}

table {
  background-color: var(--bg-color);
  transition: background-color 0.2s ease;
}

td {
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.2s ease, color 0.2s ease;
}