/* ===============================
   Algemene basis
   =============================== */
:root {
  --blue: #1f3c88;
  /* Delfts blauw */
  --white: #ffffff;
  --light-blue: #f2f6fb;
  --dark: #0f1b3d;
  --max-width: 1100px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Arial", sans-serif;
  background: var(--white);
  color: var(--dark);
  line-height: 1.7;
}

/* ===============================
   Header & Navigatie
   =============================== */
/* ===============================
   Header & Navigatie
   =============================== */
header.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 1.5rem;
  /* compacter */
  background: var(--white); /* altijd wit */
  border-bottom: 2px solid var(--blue);
  position: sticky;
  top: 0;
  z-index: 1000;
}

header .logo {
  height: 70px;
  /* kleiner logo */
  transition: transform 0.2s ease;
}

header .logo:hover {
  transform: scale(1.05);
}

nav {
  display: flex;
  gap: 1.5rem;
}

nav a {
  position: relative;
  text-decoration: none;
  color: var(--blue);
  font-weight: bold;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
}

/* Hover underline effect */
nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0%;
  height: 2px;
  background-color: var(--blue);
  transition: width 0.3s ease;
}

nav a:hover {
  color: var(--dark);
}

nav a:hover::after {
  width: 100%;
}


/* ===============================
   Hero sectie
   =============================== */
.hero {
  min-height: 80vh;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
}

.hero .overlay {
  background: rgba(31, 60, 136, 0.6);
  color: var(--white);
  padding: 3rem;
  border-radius: 12px;
  max-width: 800px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero h2 {
  font-size: 1.6rem;
  margin-bottom: 1.5rem;
}


/* ===============================
   Buttons
   =============================== */
.cta-btn {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  padding: 0.75rem 1.5rem;
  margin-top: 1rem;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.3s ease;
}

.cta-btn:hover {
  background: #0f1b3d;
}

/* ===============================
   Secties algemeen
   =============================== */
section {
  padding: 4rem 2rem;
  max-width: var(--max-width);
  margin: auto;
}

section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--blue);
}

section p.intro {
  max-width: 700px;
  margin: 0 auto 2rem auto;
  text-align: center;
  font-size: 1.1rem;
  color: #333;
}

/* ===============================
   About sectie
   =============================== */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.about img {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
}

/* ===============================
   Pilaren sectie
   =============================== */
.pillars .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.pillar {
  background: var(--light-blue);
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
  transition: transform 0.3s ease;
}

.pillar:hover {
  transform: translateY(-5px);
}

.pillars-btn {
  display: flex;
  justify-content: center;
}


/* ===============================
   Sky sectie (background overlay)
   =============================== */
.sky {
  background-size: cover;
  background-position: center;
  text-align: center;
  position: relative;
}

.sky .overlay-light {
  background: rgba(255, 255, 255, 0.85);
  padding: 3rem;
  border-radius: 10px;
  max-width: 800px;
  margin: auto;
}

.sky blockquote {
  font-size: 1.3rem;
  font-style: italic;
  margin: 1rem 0;
  color: var(--blue);
}

/* ===============================
   Skyyurt sectie
   =============================== */
.skyyurt-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.skyyurt-preview img {
  max-width: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

/* ===============================
   Mission & Vision
   =============================== */
.mission {
  background: var(--light-blue);
  border-left: 6px solid var(--blue);
  padding: 3rem 2rem;
  border-radius: 10px;
  max-width: 900px;
  margin: auto;
  text-align: center;
}

/* ===============================
   CTA sectie
   =============================== */
.cta {
  text-align: center;
  background: var(--blue);
  color: var(--white);
  border-radius: 8px;
  padding: 3rem 2rem;
  max-width: 800px;
  margin: 4rem auto;
}

.cta h2 {
  margin-bottom: 1rem;
  color: var(--white);
}

/* ===============================
   Contact
   =============================== */
.contact {
  text-align: center;
  max-width: 700px;
  margin: auto;
}

.contact a {
  color: var(--blue);
  font-weight: bold;
}

/* ===============================
   Footer
   =============================== */
footer {
  background: var(--dark);
  color: var(--white);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  margin-top: 3rem;
}

/* ===============================
   Responsive
   =============================== */
@media (max-width: 900px) {

  .about,
  .skyyurt-preview {
    grid-template-columns: 1fr;
    text-align: center;
  }

  header.main-header {
    flex-direction: column;
  }

  nav {
    margin-top: 1rem;
  }
}