:root {
    --fdrx-dark: #2c3e50;
    --fdrx-darker: #333;
    --fdrx-blue: #00244f;
    --fdrx-blue-dark: #001d44;
    --fdrx-red: #ff5f58;
    --fdrx-red-dark: #c62626;
    --fdrx-white: #ffffff;

    --font-family-1: sohne, "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-family-2: source-serif-pro, Georgia, Cambria, "Times New Roman", Times, serif;
  
    --font-h1: 700 42px / normal var(--font-family-1);
    --font-h2: 700 32px / normal var(--font-family-1);
    --font-h3: 700 22px / normal var(--font-family-1);
    --font-h4: 400 18px / normal var(--font-family-1);
    --font-content: 400 20px / normal var(--font-family-2);
    --font-list: 400 18px / normal var(--font-family-2);
    --font-link: 400 20px / normal var(--font-family-2);
    --font-legend: 600 12px / normal var(--font-family-1);
    --font-small: 600 11px / normal var(--font-family-1);
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    box-sizing: border-box;
}

body {
  font-family: var(--font-family-1);
  max-width: 1200px;
  margin: 0 auto;
  background: var(--fdrx-white);
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
}

h1 {
  color: var(--fdrx-dark);
  border-bottom: 2px solid var(--fdrx-blue);
}

h2 {
  
}

h3 {
  
}

h4 {
  
}

h5 {
  
}

.red { 
  color: var(--fdrx-red);
}

.dark {
  color: var(--fdrx-dark);
}

.darker {
  color: var(--fdrx-darker);
}

.dark-cell {
  background-color: var(--fdrx-dark);
  color: var(--fdrx-white);
  padding-left: 5px;
}

h3.red,
h3.dark {
  margin-top: 40px;
}

a {
  color: var(--fdrx-red);
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

img.thumbnail {
  width: 100%;
  height: 190px;
  object-fit: cover;
  margin-bottom: 15px;
} 
@media (max-width: 900px) {
  img.thumbnail {
    width: 100%;
    height: auto;
  }
}
@media (max-width: 600px) {
  img.thumbnail {
    max-height: 200px;
  }
}

img.thumb {
  max-width: 200px;
  max-height: 140px;
  height: auto;
  cursor: pointer;
  transition: transform 0.2s;
}

img.thumb:hover {
  transform: scale(1.05);
}

.links-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto 20px;
}

.link-section {
  display: flex;
  flex-direction: column;
}

.links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.links li {
  text-align: left;
}

@media (max-width: 1200px) {
  .dark-cell {
    margin-left: 5px;
    margin-right: 5px;
  }
  .links-container {
    padding-left: 10px;
  }
}

@media (max-width: 680px) {
  .dark-cell {
    margin-left: 5px;
    margin-right: 5px;
  }
  .links-container {
    padding-left: 10px;
  }
}

@media (max-width: 768px) {
  .links-container {
    grid-template-columns: 1fr;
  }
}

/* CHECKBOXES */
#filter-form input[type="checkbox"] {
  appearance: none;
  width: 16px;
  height: 16px;
  border: 2px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  background-color: #fff;
  vertical-align: middle;
  margin-right: 0;
}

#filter-form input[type="checkbox"]:checked {
  background-color: var(--fdrx-dark);
  border-color: var(--fdrx-dark);
}

#filter-form input[type="checkbox"]:checked::after {
  content: "✔";
  color: #fff;
  font-size: 11px;
  text-align: center;
  display: block;
  margin-top: -2px;
}

#filter-form label {
  margin-right: 15px;
  user-select: none;
}

@media (max-width: 1200px) {
  #filter-form {
    margin-left: 5px;
  }
}