/* --- Globale Reset & Basisinstellingen --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary-color: #34495E;
  --secondary-color: #5A7E9C;
  --accent-color: #6A96C2;
  --background-color: #F5F5F5;
  --text-color: #2C3E50;
  --text-light: #5f6c79;
  --white: #FFFFFF;
  --border-color: #e0e0e0;

  --font-family-sans: 'Open Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-bold: 700;

  --spacing-xs: 4px;
  --spacing-s: 8px;
  --spacing-m: 16px;
  --spacing-l: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-xxxl: 64px;
  --spacing-section: clamp(4rem, 10vw, 8rem);
  --border-radius: 8px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-sans);
  color: var(--text-color);
  background-color: var(--background-color);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Typografie --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-l);
  color: var(--primary-color);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  margin-bottom: var(--spacing-m);
  max-width: 75ch;
  color: var(--text-light);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover, a:focus {
  color: var(--secondary-color);
  text-decoration: underline;
}

ul, ol {
  list-style-position: inside;
  padding-left: var(--spacing-m);
}

/* --- Layout Containers --- */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-xl);
  padding-right: var(--spacing-xl);
}

.section {
  padding-top: var(--spacing-section);
  padding-bottom: var(--spacing-section);
}

.section-light {
    background-color: var(--white);
}

.section-dark {
    background-color: var(--primary-color);
    color: var(--white);
}

.section-dark h1, .section-dark h2, .section-dark h3 {
    color: var(--white);
}

.section-dark p {
    color: rgba(255,255,255,0.8);
}


/* --- Header & Navigatie --- */
.header {
  background-color: var(--white);
  padding: var(--spacing-m) 0;
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: background-color 0.3s ease;
}

.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
  color: var(--secondary-color);
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links li {
  margin-left: var(--spacing-l);
  position: relative;
}

.nav-links a {
  color: var(--text-color);
  font-weight: var(--font-weight-regular);
  text-decoration: none;
  padding: var(--spacing-s) 0;
  font-size: 0.95rem;
}

.nav-links a.active, .nav-links a:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
}

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--white);
  min-width: 250px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  z-index: 1;
  padding: var(--spacing-s) 0;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.dropdown:hover .dropdown-content {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.dropdown-content a {
  color: var(--text-color);
  padding: var(--spacing-s) var(--spacing-m);
  text-decoration: none;
  display: block;
  font-size: 0.9rem;
}

.dropdown-content a:hover {
  background-color: var(--background-color);
  color: var(--accent-color);
}

/* Mobiele Navigatie */
.mobile-menu-toggle {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
}

.mobile-menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--primary-color);
  margin: 5px 0;
  transition: all 0.3s ease-in-out;
}

/* --- Hero Sectie --- */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--white);
  padding: var(--spacing-xxxl) var(--spacing-xl);
  background-size: cover;
  background-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(52, 73, 94, 0.8), rgba(52, 73, 94, 0.6));
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.hero h1 {
  color: var(--white);
  font-size: clamp(2rem, 5vw, 3.5rem);
  text-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.8;
  margin-top: var(--spacing-m);
}

/* --- Breadcrumbs --- */
.breadcrumbs {
    padding: var(--spacing-m) 0;
    font-size: 0.9rem;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--white);
}

.breadcrumbs a {
    color: var(--text-light);
}

.breadcrumbs a:hover {
    color: var(--accent-color);
}

/* --- Footer --- */
.footer {
  background-color: var(--primary-color);
  color: var(--background-color);
  padding: var(--spacing-xxxl) 0;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xxl);
}

.footer-col h4 {
  color: var(--white);
  margin-bottom: var(--spacing-l);
  font-size: 1.1rem;
}

.footer-col p, .footer-col ul li {
  margin-bottom: var(--spacing-s);
  color: rgba(255,255,255,0.7);
}

.footer-col a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--white);
  text-decoration: underline;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-bottom {
  text-align: center;
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-l);
  border-top: 1px solid rgba(255,255,255,0.2);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

/* --- Componenten --- */
.btn {
  display: inline-block;
  padding: var(--spacing-m) var(--spacing-xl);
  font-weight: var(--font-weight-bold);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--white);
}

.btn-primary:hover {
  background-color: var(--secondary-color);
  color: var(--white);
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
}

.btn-secondary:hover {
  background-color: var(--accent-color);
  color: var(--white);
  text-decoration: none;
}

hr.divider {
    border: 0;
    height: 1px;
    background: var(--border-color);
    margin: var(--spacing-xxxl) 0;
}

/* Publications Grid */
.publication-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.publication-card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.publication-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.07);
}

.publication-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-m);
}

.publication-card p {
    flex-grow: 1;
    font-size: 0.95rem;
}

.publication-card a.read-more {
    margin-top: var(--spacing-m);
    font-weight: var(--font-weight-bold);
    align-self: flex-start;
}

/* --- Article Pagina --- */
.article-header {
    text-align: center;
    margin-bottom: var(--spacing-xxxl);
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-content img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: var(--spacing-l) 0;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.article-content h2, .article-content h3 {
    margin-top: var(--spacing-xxl);
}

.article-content blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: var(--spacing-l);
    margin: var(--spacing-l) 0;
    font-style: italic;
    color: var(--text-color);
}

.non-commercial-cta {
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xxxl);
    text-align: center;
}

.non-commercial-cta p {
    font-weight: var(--font-weight-regular);
    color: var(--text-color);
    font-size: 1.1rem;
    margin: 0;
}

/* --- Contact Pagina & Formulier --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xxxl);
    align-items: start;
}

.contact-info-block ul {
    list-style: none;
    padding: 0;
}

.contact-info-block li {
    display: flex;
    align-items: start;
    margin-bottom: var(--spacing-l);
    font-size: 1.1rem;
}

.contact-info-block svg {
    width: 24px;
    height: 24px;
    margin-right: var(--spacing-m);
    color: var(--accent-color);
    flex-shrink: 0;
    margin-top: 4px;
}

.form-group {
    margin-bottom: var(--spacing-l);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-s);
    font-weight: var(--font-weight-regular);
}

.form-control {
    width: 100%;
    padding: var(--spacing-m);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(106, 150, 194, 0.2);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

.form-notice {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-l);
    border-left: 3px solid var(--secondary-color);
    padding-left: var(--spacing-m);
}

.map-container {
  width: 100%;
  height: 450px;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  margin-top: var(--spacing-xxxl);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* --- Scroll-to-top knop --- */
#scrollTopBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 99;
  border: none;
  outline: none;
  background-color: var(--primary-color);
  color: white;
  cursor: pointer;
  padding: 10px;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  transition: opacity 0.3s, visibility 0.3s;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

#scrollTopBtn svg {
    width: 24px;
    height: 24px;
}

#scrollTopBtn:hover {
  background-color: var(--secondary-color);
}

/* --- Cookie Banner --- */
#cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(30, 41, 59, 0.95);
  color: var(--white);
  padding: var(--spacing-l);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-l);
  font-size: 0.9rem;
  backdrop-filter: blur(5px);
}

.cookie-text {
  max-width: 60%;
  text-align: center;
}

.cookie-text a {
    color: var(--accent-color);
    text-decoration: underline;
}

.cookie-buttons {
  display: flex;
  gap: var(--spacing-m);
}

/* --- Dank-u pagina --- */
.thank-you-section {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 20px;
}

.thank-you-icon {
  width: 80px;
  height: 80px;
  background: var(--accent-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 30px;
}

.thank-you-icon svg {
  width: 40px;
  height: 40px;
  color: white;
}

.thank-you-section h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 20px;
}

.thank-you-section p {
  font-size: 1.2rem;
  color: var(--text-light);
  max-width: 600px;
  margin-bottom: 30px;
}

/* --- Responsive Media Queries --- */
@media (max-width: 1024px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--white);
    padding: var(--spacing-m);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    margin: var(--spacing-s) 0;
    width: 100%;
  }

  .nav-links a {
      display: block;
      padding: var(--spacing-m);
      text-align: center;
  }
  
  .nav-links a.active::after {
      display: none;
  }
  
  .dropdown:hover .dropdown-content {
    display: none; /* Disable hover on mobile */
  }
  .dropdown-content {
      position: static;
      display: block;
      opacity: 1;
      transform: none;
      box-shadow: none;
      padding: 0;
      background: #fdfdfd;
      border-radius: var(--border-radius);
      margin-top: var(--spacing-s);
  }
  .dropdown-content a {
      padding-left: var(--spacing-xl);
  }
  .dropdown .dropdown-toggle::after {
    content: " ▼";
    font-size: 0.8em;
  }


  .mobile-menu-toggle {
    display: block;
  }

  .mobile-menu-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .mobile-menu-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .mobile-menu-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .cookie-text {
      max-width: 100%;
      text-align: center;
      margin-bottom: var(--spacing-m);
  }
  #cookie-banner {
      flex-direction: column;
  }

  .map-container {
    height: 350px;
    border-radius: var(--border-radius);
  }
}

.hidden {
  display: none;
}