body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: white;

  /* achtergrond foto */
  background-image: 
    linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.45)),
    url("background.jpg");

  background-size: cover;
  background-position: center;
  background-attachment: fixed;
    }

    /* HEADER */
    header {
  background-color: #e0f2fe;  /* licht ijsblauw */
  padding: 30px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
    }

    .logo-title {
  display: flex;
  align-items: center;
  gap: 25px;
  font-size: 40px;
  font-weight: bold;
  color: #0f172a;  /* donker voor contrast */
    }

    .logo {
  height: 100px;
    }

    /* NAVIGATIE */
    nav a {
      color: #0f172a;
      text-decoration: none;
      margin-left: 30px;
      font-size: 18px;
      font-weight: 600;
    }

    nav a:hover {
      color: #0369a1;
    }

    /* PAGINA INHOUD */
    main {
      padding: 60px 40px;
      font-size: 22px;
    }

    .container {
  padding: 60px 40px;
  max-width: 1100px;
  margin: auto;
}

.page-title {
  font-size: 42px;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 40px;
  max-width: 700px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  padding: 25px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.2);
}

.card h2 {
  margin-top: 0;
}
header {
  background-color: #e0f2fe;
  padding: 30px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-title {
  display: flex;
  align-items: center;
  gap: 25px;
  font-size: 40px;
  font-weight: bold;
  color: #0f172a;
}

.logo {
  height: 100px;
}

nav a {
  color: #0f172a;
  text-decoration: none;
  margin-left: 25px;
  font-size: 18px;
  font-weight: 600;
}

nav a:hover {
  color: #0369a1;
}

nav a.active {
  font-weight: 900;
  text-decoration: underline;
}
/* ============================= */
/* 📱 MOBILE / TABLET RESPONSIVE */
/* ============================= */

@media (max-width: 900px) {

  /* header stapelen */
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
    padding: 25px;
  }

  /* logo kleiner */
  .logo {
    height: 70px;
  }

  /* titel kleiner */
  .logo-title {
    font-size: 28px;
  }

  /* menu compacter */
  nav {
    margin-top: 10px;
  }

  nav a {
    margin-left: 0;
    margin-right: 18px;
    font-size: 16px;
  }

  /* pagina padding kleiner */
  .container {
    padding: 30px 20px;
  }

  /* titel kleiner */
  .page-title {
    font-size: 32px;
  }

  /* cards onder elkaar i.p.v. 3 naast elkaar */
  .grid {
    grid-template-columns: 1fr;
  }