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

:root {
  --color-primary: #1C2F4D; /* Diep marineblauw */
  --color-secondary: #5A7B9B; /* Gedempt blauw */
  --color-accent: #9BB0C7; /* Zacht institutioneel blauw */
  --color-bg: #F5F5F5; /* Licht neutraal grijs */
  --color-text: #333333; /* Donker neutraal grijs */
  --color-bg-darker: #EAEAEA;
  --color-white: #FFFFFF;
  --color-border: #DCDCDC;
  --font-family-base: 'Lato', 'Open Sans', sans-serif;
  --header-height: 80px;
  --section-padding: clamp(4rem, 10vw, 8rem);
  --border-radius: 8px;
}

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

body {
  font-family: var(--font-family-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 1rem;
}

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: 1.5rem; max-width: 75ch; }
a { color: var(--color-secondary); text-decoration: none; transition: color 0.3s ease; }
a:hover, a:focus { color: var(--color-primary); text-decoration: underline; }

/* --- Layout & Helpers --- */
.container {
  width: 90%;
  max-width: 1200px;
  margin-inline: auto;
}

.section {
  padding-block: var(--section-padding);
}

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

.text-center {
  text-align: center;
}

.centered-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  font-weight: 600;
  color: var(--color-primary);
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links li.active a::after {
  width: 100%;
}

.nav-dropdown {
  position: relative;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-white);
  min-width: 300px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  border-radius: var(--border-radius);
  padding: 1rem;
  z-index: 1;
}

.nav-dropdown:hover .dropdown-content {
  display: block;
}

.dropdown-content a {
  color: var(--color-primary);
  padding: 0.75rem 1rem;
  display: block;
  white-space: nowrap;
  font-weight: 400;
}

.dropdown-content a:hover {
  background-color: var(--color-bg);
  text-decoration: none;
}

.dropdown-content a::after {
  display: none;
}

.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
}

.hamburger .bar {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px auto;
  background-color: var(--color-primary);
  transition: all 0.3s ease-in-out;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
  color: var(--color-white);
  text-align: left;
  padding: 4rem 0;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(28, 47, 77, 0.85) 0%, rgba(28, 47, 77, 0.6) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: var(--color-white);
  max-width: 25ch;
  margin-bottom: 0;
}

.hero .breadcrumbs {
  margin-top: 1rem;
  color: var(--color-accent);
}

.hero .breadcrumbs a {
  color: var(--color-accent);
  text-decoration: none;
}

.hero .breadcrumbs a:hover {
  text-decoration: underline;
}

/* --- Image Styling --- */
img, .hero {
  filter: grayscale(1) brightness(0.9) sepia(0.1);
}

.content-image {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  object-fit: cover;
}

/* --- Page Specific Sections --- */

/* Home Page */
.intro-section p {
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 65ch;
}

.ecosystem-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.ecosystem-item {
  background-color: var(--color-white);
  padding: 2rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.ecosystem-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(90, 123, 155, 0.15);
}

.ecosystem-item h3 {
  color: var(--color-secondary);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.themes-section {
  background-color: var(--color-primary);
  color: var(--color-bg);
  padding-block: var(--section-padding);
}

.themes-section h2 {
  color: var(--color-white);
  text-align: center;
  margin-bottom: 3rem;
}

.themes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.theme-link {
  color: var(--color-accent);
  font-size: 1.2rem;
  font-weight: 600;
  display: block;
  padding: 2rem;
  border: 1px solid var(--color-secondary);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-link:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

/* About Page & Article Pages */
.content-section {
  padding-block: var(--section-padding);
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
  align-items: center;
}

.content-grid-2-col {
  grid-template-columns: 1fr 1fr;
}

.content-grid-2-col-reverse > :first-child {
  order: 2;
}

.content-grid h2 {
  margin-bottom: 1.5rem;
}

.values-list {
  list-style: none;
  padding-left: 0;
}

.values-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 1rem;
}

.values-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: bold;
}

.article-content {
  font-size: 1.1rem;
  line-height: 1.8;
}

.article-content h3 {
  margin-top: 3rem;
  margin-bottom: 1rem;
  color: var(--color-secondary);
}

.article-meta {
  color: #777;
  margin-bottom: 2rem;
  font-style: italic;
}

.related-articles {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-border);
}

.related-articles h3 {
  text-align: center;
  margin-bottom: 2rem;
}

.related-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.related-article-card {
  text-decoration: none;
  color: var(--color-text);
  display: block;
}

.related-article-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
}

.related-article-card h4 {
  color: var(--color-secondary);
  margin-bottom: 0.5rem;
}

.related-article-card:hover h4 {
  color: var(--color-primary);
  text-decoration: underline;
}

/* Contact Page */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: flex-start;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-info-item svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  margin-top: 5px;
  color: var(--color-secondary);
}

.contact-info-item h4 {
  margin-bottom: 0.25rem;
  font-size: 1.1rem;
}

.contact-info-item p,
.contact-info-item a {
  margin-bottom: 0;
  color: var(--color-text);
}

.contact-info-item a:hover {
  color: var(--color-primary);
}

.contact-form .form-group {
  margin-bottom: 1.5rem;
}

.contact-form label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(90, 123, 155, 0.2);
}

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

.form-disclaimer {
  font-size: 0.9rem;
  color: #777;
  margin-top: 1rem;
}

.btn-submit {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

.btn-submit:hover {
  background-color: var(--color-secondary);
  transform: translateY(-2px);
}

.map-container {
  width: 100%;
  height: 450px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  margin-top: 2rem;
}

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

/* Privacy/Legal page */
.legal-content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

/* Thank You Page */
.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(--color-primary);
  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(--color-text);
  max-width: 600px;
  margin-bottom: 30px;
}
.btn-home {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: background-color 0.3s ease;
}
.btn-home:hover {
  background-color: var(--color-secondary);
  text-decoration: none;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-bg);
  padding-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
}

.footer-about h4, .footer-links h4, .footer-contact h4 {
  color: var(--color-white);
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
}
.footer-about p {
  color: var(--color-accent);
  font-size: 0.9rem;
  line-height: 1.6;
}
.footer-links ul, .footer-contact ul {
  list-style: none;
}
.footer-links ul li, .footer-contact ul li {
  margin-bottom: 0.75rem;
}
.footer-links a, .footer-contact a {
  color: var(--color-accent);
  text-decoration: none;
}
.footer-links a:hover, .footer-contact a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-contact .contact-item {
  display: flex;
  align-items: start;
  gap: 0.5rem;
}
.footer-contact .contact-item svg {
  width: 18px;
  height: 18px;
  margin-top: 5px;
  flex-shrink: 0;
}

.footer-bottom {
  border-top: 1px solid var(--color-secondary);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-accent);
}

/* --- Cookie Banner --- */
#cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(28, 47, 77, 0.95);
  color: var(--color-white);
  padding: 1.5rem;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

#cookie-banner p {
  margin: 0;
  flex-grow: 1;
}

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

.cookie-buttons {
  display: flex;
  gap: 1rem;
  flex-shrink: 0;
}

.cookie-btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.3s ease, color 0.3s ease;
}

#accept-cookies {
  background-color: var(--color-accent);
  color: var(--color-primary);
}
#accept-cookies:hover {
  background-color: var(--color-white);
}

#decline-cookies {
  background-color: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-accent);
}
#decline-cookies:hover {
 background-color: var(--color-secondary);
 border-color: var(--color-secondary);
}

/* --- Scroll to Top Button --- */
#scroll-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  transition: opacity 0.3s ease, transform 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}
#scroll-to-top.visible {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}
#scroll-to-top:hover {
  background-color: var(--color-primary);
}


/* --- Responsive Design --- */
@media (max-width: 1024px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: 80%;
    max-width: 350px;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem;
    gap: 1.5rem;
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
  }
  .nav-links.active {
    transform: translateX(0);
  }
  .nav-links a {
    font-size: 1.2rem;
  }
  .hamburger {
    display: block;
  }
  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }
  .hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .nav-dropdown .dropdown-content {
      display: block;
      position: static;
      background: none;
      box-shadow: none;
      padding: 0;
      padding-left: 1rem;
      transform: none;
      min-width: unset;
  }
  .nav-dropdown:hover .dropdown-content {
      display: block;
  }
  .dropdown-content a {
    padding: 0.5rem 0;
    font-size: 1rem;
  }
  .nav-dropdown > a {
    pointer-events: none; /* Disables click on "Artikelen" itself */
  }


  .footer-grid {
    grid-template-columns: 1fr;
  }
  .map-container {
    height: 350px;
  }
  .content-grid-2-col-reverse > :first-child {
    order: 0;
  }
  .content-grid-2-col {
    grid-template-columns: 1fr;
  }
  #cookie-banner {
    flex-direction: column;
    text-align: center;
  }
}