/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2d2d2d;
    --primary-dark: #1a1a1a;
    --secondary-color: #404040;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.12);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background-color: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo a {
    text-decoration: none;
    color: var(--text-dark);
}

.logo h1 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
    color: var(--primary-color);
}

.logo-subtitle {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 400;
}

/* Navigation Styles */
.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-list a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--primary-color);
}

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 5rem 0;
    text-align: center;
}

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

.hero-title {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 0.9rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--bg-white);
    border: 2px solid var(--bg-white);
}

.btn-secondary:hover {
    background-color: var(--bg-white);
    color: var(--primary-color);
}

/* Section Styles */
section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.divider {
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    margin: 0 auto;
}

/* Research in Focus Section */
.research-focus {
    background-color: var(--bg-white);
}

.focus-publications {
    max-width: 1000px;
    margin: 0 auto;
}

/* Landscape Card */
.focus-pub-card-landscape {
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.focus-pub-card-landscape:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.focus-pub-img-landscape {
    width: 100%;
    height: auto;
    display: block;
}

/* Portrait Cards Grid */
.focus-portrait-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.focus-pub-card-portrait {
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.focus-pub-card-portrait:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.focus-pub-img-portrait {
    width: 100%;
    height: auto;
    display: block;
}

/* Publication Info */
.focus-pub-info {
    padding: 1.5rem;
}

.focus-pub-title-compact {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.8rem;
    line-height: 1.4;
}

.focus-pub-authors-compact {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.focus-pub-venue-compact {
    color: var(--primary-color);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.focus-pub-btn {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.focus-pub-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Research Highlights */
.research-highlights {
    background-color: var(--bg-light);
}

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

.highlight-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

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

.highlight-icon {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.highlight-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.highlight-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* CTA Section */
.cta {
    background-color: var(--bg-light);
    text-align: center;
}

.cta-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.cta-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    background-color: var(--text-dark);
    color: white;
    padding: 3rem 0 1.5rem;
}

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

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* Content Pages */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
}

.page-content {
    padding: 4rem 0;
}

.content-section {
    margin-bottom: 3rem;
}

.content-section h3 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.content-section p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

/* Group Photos Slider */
.group-photos-section {
    margin-bottom: 4rem;
    background-color: #d0d2d6;
    padding: 3rem 0;
    margin-left: -20px;
    margin-right: -20px;
    padding-left: 20px;
    padding-right: 20px;
}

.slider-container {
    position: relative;
    max-width: 900px;
    height: 500px;
    margin: 0 auto;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-white);
}

.slider-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

.slide {
    display: none;
    width: 100%;
    height: 100%;
}

.slide.active {
    display: block;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(45, 45, 45, 0.7);
    color: white;
    border: none;
    padding: 1rem 1.2rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background-color 0.3s ease;
    z-index: 10;
}

.slider-btn:hover {
    background-color: rgba(45, 45, 45, 0.9);
}

.prev-btn {
    left: 10px;
    border-radius: 0 4px 4px 0;
}

.next-btn {
    right: 10px;
    border-radius: 4px 0 0 4px;
}

.slider-dots {
    text-align: center;
    padding: 1rem 0;
    position: absolute;
    bottom: 10px;
    width: 100%;
    z-index: 10;
}

.dot {
    height: 12px;
    width: 12px;
    margin: 0 5px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    display: inline-block;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.dot.active,
.dot:hover {
    background-color: rgba(255, 255, 255, 0.9);
}

/* Member Cards */
.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.members-grid-three {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.member-card {
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.member-photo {
    width: 200px;
    height: 200px;
    border-radius: 12px;
    margin: 0 auto 1.5rem;
    background-color: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary-color);
    overflow: hidden;
}

.member-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.member-role {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

.member-bio {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

.member-interest {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Publications List */
.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-item {
    background-color: var(--bg-white);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border-radius: 4px;
}

.publication-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.publication-authors {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.publication-venue {
    color: var(--primary-color);
    font-weight: 500;
}

/* News Items */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.news-item {
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-content {
    padding: 1.5rem;
}

.news-date {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.news-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.8rem;
}

.news-description {
    color: var(--text-light);
    line-height: 1.6;
}

/* Publications Filters */
.filters-section {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 3rem;
}

.filters-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.filter-group-full {
    width: 100%;
}

.filter-label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 1.1rem;
}

/* Segmented Controls */
.segmented-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.segment-btn {
    padding: 0.7rem 1.5rem;
    border-radius: 25px;
    border: 2px solid var(--primary-color);
    background-color: var(--bg-white);
    color: var(--primary-color);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.segment-btn:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(45, 45, 45, 0.2);
}

.segment-btn.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 8px rgba(45, 45, 45, 0.3);
}

.segment-btn:active {
    transform: translateY(0);
}

/* Secondary Filters */
.secondary-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: flex-end;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.filter-select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    background-color: var(--bg-white);
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-dark);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.btn-reset {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

/* Publications Container */
.publications-container {
    max-width: 1000px;
    margin: 0 auto;
}

.year-section {
    margin-bottom: 3rem;
}

.year-heading {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
}

/* Publication Card */
.publication-card {
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

.publication-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.publication-card.hidden {
    display: none;
}

.publication-card-header {
    margin-bottom: 1rem;
    position: relative;
}

.highlighted-badge {
    display: inline-block;
    background-color: #ffd700;
    color: #1a1a1a;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pub-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.5;
    margin-bottom: 0.5rem;
}

.publication-card-body {
    color: var(--text-light);
}

.pub-authors {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.pub-venue {
    font-size: 0.95rem;
    color: var(--primary-color);
    font-weight: 500;
    font-style: italic;
    margin-bottom: 1rem;
}

.pub-link {
    display: inline-block;
    margin-left: 0.5rem;
    padding: 0.2rem 0.6rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    font-style: normal;
    transition: background-color 0.3s ease;
}

.pub-link:hover {
    background-color: var(--primary-dark);
    text-decoration: none;
}

.pub-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.tag-area {
    background-color: #f0f0f0;
    color: #404040;
}

.tag-highlighted {
    background-color: #fff9e6;
    color: #f57c00;
    border: 1px solid #ffd700;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--bg-white);
        box-shadow: var(--shadow);
        display: none;
    }

    .nav.active {
        display: block;
    }

    .nav-list {
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
    }

    .nav-list li {
        border-bottom: 1px solid var(--border-color);
    }

    .nav-list a {
        display: block;
        padding: 1rem 20px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .highlights-grid,
    .members-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

    .members-grid-three {
        grid-template-columns: repeat(2, 1fr);
    }

    .focus-portrait-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.1rem;
    }

    .logo-subtitle {
        font-size: 0.75rem;
    }

    .hero-title {
        font-size: 1.6rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .members-grid-three {
        grid-template-columns: 1fr;
    }

    .focus-pub-title-compact {
        font-size: 1rem;
    }

    .slider-btn {
        padding: 0.5rem 0.7rem;
        font-size: 0.9rem;
    }

    .slider-container {
        border-radius: 0;
        height: 250px;
    }

    .group-photos-section {
        margin-left: -20px;
        margin-right: -20px;
        padding: 1.5rem 20px;
    }
}

/* Course Cards - Teaching Page */
.courses-section {
    max-width: 1000px;
    margin: 0 auto;
}

.course-card {
    display: flex;
    gap: 2rem;
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

.course-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.course-image {
    flex-shrink: 0;
    width: 200px;
    height: 200px;
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-image svg {
    width: 100%;
    height: 100%;
}

.course-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.course-description {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.course-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.course-link {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.course-link:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Responsive for course cards */
@media (max-width: 768px) {
    .course-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .course-image {
        width: 180px;
        height: 180px;
    }

    .course-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .course-image {
        width: 150px;
        height: 150px;
    }

    .course-title {
        font-size: 1.3rem;
    }
}