:root {
    --primary-color: #2F4F4F; /* Diep leigrijsblauw */
    --secondary-color: #808080; /* Koel grijs */
    --accent-color: #ADD8E6; /* Licht institutioneel blauw */
    --background-color: #F5F5F5; /* Zacht neutraal grijs */
    --text-color: #36454F; /* Donker antraciet */
    --text-muted: #6c757d;
    --light-gray: #EAEAEA;
    --white: #FFFFFF;
    --black: #000000;
    
    --font-family-base: 'Lato', sans-serif;
    
    --container-width: 1200px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;
    --spacing-xxl: 120px;
    
    --border-radius: 4px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08); 
    --transition: all 0.3s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    font-size: 100%;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

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

.text-link {
    color: var(--primary-color);
    font-weight: 700;
    text-decoration: none;
}
.text-link:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius);
}

ul {
    list-style: none;
}

/* --- LAYOUT --- */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-xxl) 0;
}
.section--light {
    background-color: var(--background-color);
}
.section--no-padding-top {
    padding-top: 0;
}

.content-section {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}
.content-section-narrow {
    max-width: 800px;
    margin: 0 auto;
}

/* --- HEADER & NAVIGATION --- */
.header {
    position: sticky;
    top: 0;
    width: 100%;
    background-color: var(--white);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

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

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-weight: 400;
    font-size: 1rem;
    color: var(--text-color);
    text-decoration: none;
    position: relative;
    padding: var(--spacing-sm) 0;
}

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

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

.nav-links a.active {
    font-weight: 700;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 22px;
    position: relative;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
    position: absolute;
    left: 0;
    transition: all 0.3s;
}

.mobile-menu-toggle span:nth-child(1) { top: 0; }
.mobile-menu-toggle span:nth-child(2) { top: 9px; }
.mobile-menu-toggle span:nth-child(3) { top: 18px; }

/* Mobile Menu Open State */
.mobile-menu-toggle.open span:nth-child(1) { transform: rotate(45deg); top: 9px; }
.mobile-menu-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-menu-toggle.open span:nth-child(3) { transform: rotate(-45deg); top: 9px; }

/* --- HERO SECTION --- */
.hero {
    position: relative;
    color: var(--white);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
}
.hero--home {
    min-height: 80vh;
    background: url('https://images.pexels.com/photos/8376285/pexels-photo-8376285.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940') no-repeat center center/cover;
}
.hero--page {
    min-height: 40vh;
    background: url('https://images.pexels.com/photos/10914618/pexels-photo-10914618.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940') no-repeat center center/cover;
}
.hero--article {
    min-height: 50vh;
    background: url('https://images.pexels.com/photos/11785748/pexels-photo-11785748.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940') no-repeat center center/cover;
}

.hero__overlay {
    position: absolute;
    inset: 0;
    background-color: var(--primary-color);
    opacity: 0.8;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero__title {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.hero__subtitle {
    font-size: 1.3rem;
    font-weight: 300;
    opacity: 0.9;
}

/* --- ARTICLE LIST --- */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.article-card {
    background-color: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.article-card__content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-card__category {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}
.article-card__title {
    margin-bottom: var(--spacing-sm);
}

.article-card__title a {
    text-decoration: none;
    color: var(--primary-color);
}
.article-card__title a:hover {
    color: var(--secondary-color);
}

.article-card__excerpt {
    flex-grow: 1;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

/* --- ARTICLE CONTENT --- */
.article-content h2, .article-content h3 { margin-top: var(--spacing-xl); }
.article-content p { font-size: 1.1rem; }
.article-meta {
    margin-bottom: var(--spacing-lg);
    font-style: italic;
    color: var(--text-muted);
}
.article-image {
    margin: var(--spacing-xl) 0;
}
.article-image figcaption {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--spacing-sm);
}
.editorial-callout {
    background-color: var(--background-color);
    border-left: 4px solid var(--accent-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}
.editorial-callout h3 { margin-top: 0; }

.structural-diagram {
    background: var(--background-color);
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    text-align: center;
}
.diagram-title { font-size: 1rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: var(--spacing-lg); }
.diagram-level { border: 1px solid var(--secondary-color); background: var(--white); padding: var(--spacing-md); border-radius: var(--border-radius); }
.diagram-level--side { border-style: dashed;}
.diagram-level h4 { font-size: 1rem; margin-bottom: var(--spacing-xs); }
.diagram-level p { font-size: 0.8rem; margin: 0; color: var(--text-muted); }
.diagram-arrow { color: var(--secondary-color); font-size: 1.5rem; margin: var(--spacing-sm) 0; }
.structural-diagram figcaption { font-size: 0.8rem; color: var(--text-muted); text-align: center; margin-top: var(--spacing-md); }

/* --- GRID LAYOUTS --- */
.grid-2-col {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}
@media (min-width: 768px) {
    .grid-2-col { grid-template-columns: 1fr 1fr; }
    .content-section.grid-2-col { text-align: left; }
}
.grid-2-col-contact {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}
@media (min-width: 1024px) {
    .grid-2-col-contact { grid-template-columns: 1fr 1.2fr; }
}

.focus-list {
    list-style-type: '✓ ';
    padding-left: var(--spacing-md);
    columns: 2;
    text-align: left;
    max-width: 700px;
    margin: var(--spacing-lg) auto 0;
}
.focus-list li { padding-left: var(--spacing-sm); margin-bottom: var(--spacing-sm); }

.section-image-full img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 0;
}

/* --- VALUES GRID --- */
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    text-align: left;
}
.value-card { padding: var(--spacing-lg); background: var(--white); border-radius: var(--border-radius); border: 1px solid var(--light-gray); }
.value-card__icon { color: var(--primary-color); margin-bottom: var(--spacing-md); }
.value-card__icon svg { width: 40px; height: 40px; }
.value-card h3 { margin-bottom: var(--spacing-sm); font-size: 1.2rem; }
.value-card p { font-size: 0.95rem; margin-bottom: 0; }

/* --- CONTACT PAGE --- */
.contact-details { font-size: 1.1rem; }
.contact-info-block { margin-top: var(--spacing-lg); }
.contact-info-item { display: flex; align-items: flex-start; gap: var(--spacing-md); margin-bottom: var(--spacing-lg); }
.contact-icon { width: 24px; height: 24px; color: var(--primary-color); flex-shrink: 0; margin-top: 5px; }
.contact-info-item p { margin-bottom: 0; }
.contact-info-item a { text-decoration: underline; }
.contact-form-container { background: var(--background-color); padding: var(--spacing-xl); border-radius: var(--border-radius); }
.contact-form-container h3 { margin-top: 0; }

/* --- FORMS --- */
.form-group { margin-bottom: var(--spacing-md); }
.form-group label { display: block; font-weight: 700; margin-bottom: var(--spacing-sm); }
.form-group input, .form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-family: var(--font-family-base);
    font-size: 1rem;
    transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(173, 216, 230, 0.5);
}
.form-disclaimer { font-size: 0.9rem; color: var(--text-muted); font-style: italic; }

/* --- BUTTONS --- */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}
.btn-primary { background-color: var(--primary-color); color: var(--white); }
.btn-primary:hover { background-color: #4a7c7c; }
.btn-secondary { background: none; border-color: var(--secondary-color); color: var(--secondary-color); }
.btn-secondary:hover { background-color: var(--secondary-color); color: var(--white); }
.btn-full-width { width: 100%; }

/* --- FOOTER --- */
.footer {
    background-color: var(--text-color);
    color: var(--background-color);
    padding-top: var(--spacing-xl);
}
.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}
.footer__heading { color: var(--white); }
.footer__links a { color: var(--background-color); opacity: 0.8; }
.footer__links a:hover { opacity: 1; color: var(--accent-color); text-decoration: none; }
.footer__column p { opacity: 0.8; }
.footer__column a { color: var(--accent-color); text-decoration: underline; }
.footer__column a:hover { color: var(--white); }

.disclaimer-section {
    background-color: rgba(0,0,0,0.2);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    line-height: 1.6;
    margin: var(--spacing-lg) 0;
    border: 1px solid var(--secondary-color);
}
.disclaimer-section strong { display: block; margin-bottom: var(--spacing-sm); color: var(--white); }

.footer__bottom {
    text-align: center;
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--secondary-color);
    font-size: 0.9rem;
    opacity: 0.7;
}

/* --- GOOGLE MAP --- */
.map-container {
    width: 100%;
    height: 450px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    margin: var(--spacing-xl) 0;
}
.map-container iframe { width: 100%; height: 100%; border: none; }

/* THANK YOU PAGE */
.thank-you-section {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xxl) var(--spacing-lg);
}
.thank-you-icon {
  width: 80px;
  height: 80px;
  background: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
}
.thank-you-icon svg { width: 40px; height: 40px; color: white; }
.thank-you-section h1 { margin-bottom: var(--spacing-md); }
.thank-you-section p { font-size: 1.2rem; color: var(--text-muted); max-width: 600px; margin-bottom: var(--spacing-lg); }

/* --- COOKIE BANNER --- */
#cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(29, 41, 51, 0.95);
    color: var(--white);
    padding: var(--spacing-md) 0;
    z-index: 9999;
    display: none;
    backdrop-filter: blur(5px);
}
.cookie-banner-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}
#cookie-banner p { margin: 0; font-size: 0.9rem; }
.cookie-banner-actions { display: flex; gap: var(--spacing-sm); flex-shrink: 0; }

/* --- BACK TO TOP BUTTON --- */
#back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}
#back-to-top.show {
    opacity: 1;
    visibility: visible;
}

/* --- RESPONSIVE DESIGN --- */
@media (max-width: 768px) {
    .nav-links {
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.5s ease-in-out;
        box-shadow: 0 10px 10px rgba(0,0,0,0.05);
    }

    .nav-links.open {
        max-height: 500px; /* Or a sufficiently large value */
        padding-bottom: var(--spacing-md);
    }
    
    .nav-links li {
        width: 100%;
        text-align: center;
    }
    .nav-links a {
        padding: var(--spacing-md) var(--spacing-lg);
        display: block;
        width: 100%;
    }

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

    .cookie-banner-content { flex-direction: column; }
    #cookie-banner { text-align: center; }
}

@media (max-width: 480px) {
    .focus-list { columns: 1; }
}