:root {
    --primary-color: #1A2639;
    --accent-color: #C5A880;
    --background-color: #F7F7F7;
    --secondary-color: #707070;
    --text-light: #F7F7F7;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--secondary-color);
    line-height: 1.6;
}

/* Header Styles */
.sticky-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--primary-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.logo img {
    height: 60px;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-menu li {
    margin-left: 1.5rem;
}

.nav-menu a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: white;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    padding: 2rem 5%;
    background-image: url('../images/background.jpg');
    background-clip: border-box;
    background-position: bottom;
    background-size: cover;
    text-align: center;
    margin-top: 80px;
    position: relative;
}

/* Add overlay */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(220, 220, 220, 0.8); /* White overlay with 50% opacity */
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2; /* Place content above the overlay */
    max-width: 800px;
    text-align: center;
}

.hero-content h1 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-color);
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    color: var(--secondary-color);
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.cta-group {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--accent-color);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-weight: bold;
}

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

/* About Section */
.about {
    display: flex;
    align-items: center;
    padding: 5rem 5%;
    border-radius: 10px;
}

.about-image {
    flex: 1;
    margin-right: 3rem;
    transition: transform 0.3s ease;
}

.about-image:hover {
    transform: scale(1.05);
}

.about-image img {
    max-width: 100%;
    aspect-ratio: 1/1.2;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.about-content {
    flex: 2;
    padding: 1rem;
}

.about-content h2 {
    font-family: 'Playfair Display', serif;
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

.about-content p {
    color: var(--secondary-color);
    font-size: 1.1rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

/* Blog Section */
.blog {
    padding: 3rem 0;
    background-color: var(--paper-color);
}

.blog .newspaper-header {
    padding: 1rem 2rem;
    margin-bottom: 2rem;
}

.blog .masthead {
    text-align: center;
    padding: 2rem 0;
}

.blog .masthead h2 {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-size: 3rem;
    margin: 0;
    letter-spacing: -1px;
    color: var(--text-color);
}

.blog .articles-grid {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.blog .article-card {
    position: relative;
    background: transparent;
    margin-bottom: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid rgba(44, 24, 16, 0.2);
}

.blog .article-card:last-child {
    border-bottom: none;
}

.blog .article-card h3 {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    margin: 0 0 1rem 0;
    color: var(--text-color);
    line-height: 1.2;
}

.blog .article-meta {
    margin: 0.5rem 0 1rem;
    font-size: 0.9rem;
    color: var(--gray);
    font-style: italic;
}

.blog .read-more {
    color: var(--text-color);
    text-decoration: none;
    font-style: italic;
    position: relative;
    display: inline-block;
}

.blog .read-more::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: var(--text-color);
    transition: opacity 0.2s ease;
}

.blog .read-more:hover::after {
    opacity: 0.7;
}

@media (max-width: 768px) {
    .blog .masthead h2 {
        font-size: 2.5rem;
    }

    .blog .article-card h3 {
        font-size: 1.5rem;
    }

    .blog .articles-grid {
        padding: 0 1rem;
    }
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 2rem 5%;
    text-align: center;
}

.footer-columns {
    display: flex;
    justify-content: space-between;
    padding: 20px;
}
.contact-column, .social-column {
    flex: 1;
    margin: 0 10px;
}
.footer a {
    color: var(--accent-color); /* Gouden accent */
    text-decoration: none;
}
.footer a:hover {
    text-decoration: underline; /* Lichte hover-effect */
}
@media (max-width: 768px) {
    .footer-columns {
        flex-direction: column; /* Stapel kolommen op mobiel */
    }
}
/* Responsive Design */
@media screen and (max-width: 768px) {
    /* Header */
    .sticky-header {
        padding: 0.5rem 2%;
        flex-direction: column;
    }

    .nav-menu {
        flex-direction: column;
        width: 100%;
        text-align: center;
        display: none; /* Hide by default on mobile */
    }

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

    .nav-menu li {
        margin: 0.5rem 0;
    }

    /* Hero Section */
    .hero {
        min-height: auto;
        padding: 4rem 2%;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .cta-group {
        flex-direction: column;
        gap: 1rem;
    }

    /* About Section */
    .about {
        flex-direction: column;
        padding: 3rem 2%;
    }

    .about-image {
        margin-right: 0;
        margin-bottom: 2rem;
        width: 100%;
    }

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

    .about-content h2 {
        font-size: 2rem;
    }

    /* Blog Section */
    .blog {
        padding: 3rem 2%;
    }

    .blog-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .blog-card {
        padding: 1rem;
    }

    /* Footer */
    .footer-columns {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .contact-column, .legal-column, .social-column {
        margin: 0;
    }
}

/* Add hamburger menu styles */
.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--accent-color);
}

@media screen and (max-width: 768px) {
    .menu-toggle {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1rem;
    }
}

/* Small mobile devices */
@media screen and (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.75rem;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .about-content h2 {
        font-size: 1.75rem;
    }
}

/* About Extended Page Styles */
.about-extended {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

.about-section, .expertise-section, .career-section {
    margin-bottom: 4rem;
}

.about-section h2, .expertise-section h2, .career-section h2 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

/* Expertise Grid */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.expertise-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

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

.expertise-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.expertise-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 2rem auto;
}

.timeline-item {
    display: flex;
    margin-bottom: 2rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 120px;
    height: 100%;
    width: 2px;
    background-color: var(--accent-color);
}

.timeline-item:last-child::before {
    display: none;
}

.year {
    width: 120px;
    font-weight: bold;
    color: var(--accent-color);
    padding-right: 2rem;
}

.content {
    flex: 1;
    padding-left: 2rem;
}

.content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    .expertise-grid {
        grid-template-columns: 1fr;
    }

    .timeline-item {
        flex-direction: column;
    }

    .timeline-item::before {
        left: 0;
    }

    .year {
        width: auto;
        padding-bottom: 1rem;
    }

    .content {
        padding-left: 2rem;
    }

    .about-section h2, .expertise-section h2, .career-section h2 {
        font-size: 2rem;
    }
}

/* Publications Page Styles */
.publications {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.publications-section {
    margin-bottom: 4rem;
}

.publications-section h2 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

/* Publications Grid (for books) */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Book Card Styles */
.book-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

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

.book-cover {
    height: 300px;
    overflow: hidden;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Publications List (for papers and articles) */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.publication-item {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.publication-item:hover {
    transform: translateX(5px);
}

.publication-content {
    padding: 1.5rem;
}

.publication-content h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.publication-meta {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.publication-description {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* Publication Links */
.publication-links {
    display: flex;
    gap: 1rem;
}

.link-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--accent-color);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.link-button:hover {
    background-color: var(--primary-color);
    color: var(--accent-color);
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    .publications-grid {
        grid-template-columns: 1fr;
    }

    .publication-item {
        padding: 1rem;
    }

    .publications-section h2 {
        font-size: 2rem;
    }

    .publication-content h3 {
        font-size: 1.3rem;
    }

    .publication-links {
        flex-direction: column;
    }

    .link-button {
        width: 100%;
        justify-content: center;
    }
}

/* Books Page Styles */
.books {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.books-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 3rem;
    padding: 0 2rem;
}

.book-feature {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    overflow: hidden;
    display: flex;
    gap: 3rem;
    padding: 2rem;
}

.book-cover {
    position: relative;
    width: 300px;
    height: 450px;
    perspective: 1500px;
    flex-shrink: 0;
}

.book-cover-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.book-cover:hover .book-cover-inner {
    transform: rotateY(180deg);
}

.book-front, .book-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.book-back {
    transform: rotateY(180deg);
}

.book-front img, .book-back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.book-content h2 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.book-meta {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.book-description {
    color: var(--secondary-color);
    margin: 1.5rem 0;
    line-height: 1.6;
}

.book-actions {
    display: flex;
    gap: 1rem;
    margin-top: auto;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-color);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

@media screen and (max-width: 968px) {
    .book-feature {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .book-cover {
        width: 250px;
        height: 375px;
    }

    .book-actions {
        justify-content: center;
    }
}

@media screen and (max-width: 480px) {
    .book-cover {
        width: 200px;
        height: 300px;
    }

    .book-content h2 {
        font-size: 1.5rem;
    }

    .book-meta {
        font-size: 1rem;
    }
}

/* Contact Page Styles */
.contact-section {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.contact-info {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.contact-info h2 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

/* Contact Info Items */
.info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.info-item:hover {
    background-color: var(--background-color);
}

.info-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-right: 1rem;
    width: 24px;
}

.info-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.info-item p, .info-item a {
    color: var(--secondary-color);
    text-decoration: none;
}

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

/* Responsive Design */
@media screen and (max-width: 768px) {
    .contact-info h2 {
        font-size: 1.75rem;
    }

    .info-item {
        padding: 0.75rem;
    }
}

/* Container Styles */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

/* Grid Layouts */
.books-grid,
.publications-grid,
.articles-grid,
.contact-grid {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Section Widths */
.hero-content,
.about-section,
.publications-section,
.contact-section,
.books section {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Responsive adjustments */
@media screen and (max-width: 1240px) {
    .container,
    .books-grid,
    .publications-grid,
    .articles-grid,
    .contact-grid {
        max-width: 95%;
    }
}