:root {
  --color-primary: #23AAE1; /* Donkerblauw */
  --color-secondary: #384A56; /* Donkergrijs */
  --color-tertiary: #28a745; /* Groen */
  --color-quaternary: #dc3545; /* Rood */
  --color-light: #F4F5F5; /* Lichtgrijs */
  --color-dark: #343a40; /* Zwart */
}

/* Algemene stijl voor de pagina */

body {
  background-color: var(--color-light);
  color: var(--color-dark);
  font-family: Arial, sans-serif;
}

/* Header */

header {
  background-color: var(--color-light);
  color: var(--color-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  padding-left: 5%;
  padding-right: 5%;
}

header a {
  color: var(--color-secondary);
  text-decoration: none;
  vertical-align: sub;
  text-transform: uppercase;
  text-style: normal;
  font-weight: bold;
  font-family: Heebo,Helvetica,Arial,Lucida,sans-serif;
  font-weight: 600;
  font-size:17px;
  letter-spacing:1px;
  padding-right: 20px;
}

header a:hover {
	color: var(--color-primary);
}

header nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
}

header nav li {
  margin-left: 20px;
}

/* Hero */

.hero {
  background-image: url(pentests-hero.jpg);
  background-size: cover;
  background-position: center;
  height: 300px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero h1 {
  font-size: 36px;
  color: var(--color-light);
  text-align: center;
  text-shadow: 2px 2px var(--color-dark);
}

/* Artikel */

article {
  margin: 50px;
  margin-left: 5%;
  margin-right: 5%;
}

article h2 {
  font-size: 24px;
  color: var(--color-primary);
  margin-top: 40px;
}

article p {
  font-size: 18px;
  line-height: 1.5;
  margin-top: 20px;
}

article ul {
  margin-top: 20px;
}

article li {
  font-size: 18px;
  line-height: 1.5;
  margin-bottom: 10px;
}

article button {
  background-color: var(--color-secondary);
  color: var(--color-light);
  font-size: 18px;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  margin-top: 40px;
  cursor: pointer;
  transition: background-color 0.2s ease-in-out;
}

header button {
  background-color: var(--color-secondary);
  color: var(--color-light);
  font-size: 18px;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  margin-top: -15px;
  cursor: pointer;
  transition: background-color 0.2s ease-in-out;
}

button:hover {
  background-color: var(--color-primary);
}

/* Footer */

footer {
  background-color: var(--color-secondary);
  color: var(--color-light);
  padding: 20px;
}

footer p {
  font-size: 14px;
}

footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

footer li {
  margin: 0 10px;
}

footer a {
  color: var(--color-light);
  text-decoration: none;
}

.logo-footer {
	margin-top: 2%;
	filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(7500%) brightness(113%) contrast(101%);
}

footer nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
}

footer nav li {
  margin-left: 20px;
}

footer nav {
	display: inline-block;
}

body{
	margin: 0;
}
/* Responsiveness */

@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  header nav ul {
    margin-top: 20px;
  }
  
  header nav li {
    margin-left: 0;
    margin-bottom: 10px;
}

.hero {
height: 200px;
}

.hero h1 {
font-size: 28px;
}

article {
margin: 20px;
}

article h2 {
font-size: 20px;
}

article p {
font-size: 16px;
}

article li {
font-size: 16px;
}

article button {
font-size: 16px;
padding: 8px 16px;
margin-top: 20px;
}

footer ul {
flex-direction: column;
align-items: center;
}

footer li {
margin: 10px 0;
}
}