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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--color-text-dark);
    background: var(--gradient-body-light);
    overflow-x: hidden;
}

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

/* Typography */
h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-secondary-navy);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary-teal);
    margin-bottom: 1rem;
    line-height: 1.5;
}

h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-primary-teal);
    margin-bottom: 1rem;
    line-height: 1.4;
}

h4 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-primary-teal);
    margin-bottom: 0.75rem;
}

p {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--color-text-dark);
    line-height: 1.7;
}

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

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

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.top-bar {
    background: var(--gradient-navbar);
    padding: 8px 0;
    color: var(--color-text-white);
    font-size: 0.9rem;
}

.contact-info .highlight {
    color: var(--color-text-white);
    font-weight: 600;
}

.contact-info a {
    color: var(--color-text-white);
    text-decoration: none;
}

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

/* Main Navigation */
.main-nav {
    background: var(--color-accent-cream);
    padding: 15px 0;
    position: relative;
}

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

.logo img {
    height: 60px;
    width: auto;
    transition: height 0.3s ease;
}

.header.scrolled .logo img {
    height: 45px;
}

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

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: var(--color-primary-teal);
    font-weight: 500;
    padding: 10px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.nav-menu a:hover,
.nav-menu .current a {
    color: #de211c;
    border-bottom-color: #65bc7b;
}

/* Dropdown Styles */
.dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-bg-white);
    box-shadow: var(--shadow-light);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    min-width: 250px;
    z-index: 1000;
}

.nav-menu li:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown li {
    border-bottom: 1px solid #f0f0f0;
}

.dropdown a {
    display: block;
    padding: 12px 20px;
    color: var(--color-primary-teal);
    border-bottom: none;
}

.dropdown a:hover {
    background: var(--color-bg-light);
    color: var(--color-accent-gold);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 10px;
}

.nav-toggle i {
    font-size: 1.5rem;
    color: var(--color-primary-teal);
}

/* Hero Section */
.hero-section {
    position: relative;
    height: 600px;
    overflow: hidden;
    margin-top: 120px;
}

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

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.slide.active {
    opacity: 1;
}

.slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.slide-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.slide-title {
    color: var(--color-text-white);
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Main Content */
.main-content {
    padding: 80px 0;
    min-height: calc(100vh - 600px);
}

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

.page-title {
    font-size: 2.5rem;
    color: var(--color-primary-teal);
    font-weight: 300;
    margin-bottom: 2rem;
    padding-left: 0;
}

/* Publications Grid */
.publications-grid {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.publication-item {
    background: var(--color-bg-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease;
    animation-fill-mode: both;
}

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

.publication-item:nth-child(1) { animation-delay: 0.1s; }
.publication-item:nth-child(2) { animation-delay: 0.2s; }
.publication-item:nth-child(3) { animation-delay: 0.3s; }
.publication-item:nth-child(4) { animation-delay: 0.4s; }
.publication-item:nth-child(5) { animation-delay: 0.5s; }
.publication-item:nth-child(6) { animation-delay: 0.6s; }

.publication-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.publication-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.publication-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.publication-item:hover .publication-image img {
    transform: scale(1.05);
}

.publication-info {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    padding-left: 66px;
}

.publication-icon {
    position: absolute;
    left: 1.5rem;
    top: 1.5rem;
    width: 46px;
    height: 46px;
    background-color: var(--color-primary-teal);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-white);
    font-size: 1.25rem;
}

.publication-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary-teal);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.publication-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

.publication-title a:hover {
    color: var(--color-accent-gold);
}

.publication-meta {
    flex: 1;
    margin-bottom: 1rem;
}

.publication-meta p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-medium);
    margin-bottom: 0.75rem;
}

.publication-meta strong {
    color: var(--color-text-dark);
    font-weight: 600;
}

.publication-meta em {
    font-style: italic;
}

.read-more-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: transparent;
    color: var(--color-primary-teal);
    font-weight: 500;
    border: 1px solid var(--color-primary-teal);
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    align-self: flex-start;
    margin-top: auto;
}

.read-more-btn:hover {
    background: var(--color-primary-teal);
    color: var(--color-text-white);
    transform: translateX(3px);
}

.read-more-btn::after {
    content: '→';
    margin-left: 8px;
    transition: transform 0.3s ease;
}

.read-more-btn:hover::after {
    transform: translateX(3px);
}

/* Special styling for publications without images */
.publication-item:nth-child(2) .publication-content,
.publication-item:nth-child(3) .publication-content {
    padding: 2rem 1.5rem;
}

.publication-item:nth-child(2) .publication-info,
.publication-item:nth-child(3) .publication-info {
    padding-left: 66px;
}

/* Footer Styles */
.footer {
    background: var(--gradient-navbar);
    color: var(--color-text-white);
    margin-top: 4rem;
}

.footer-widgets {
    padding: 3rem 0 2rem;
}

.footer-columns {
    display: grid;
    grid-template-columns: 1fr 1fr 2fr;
    gap: 2rem;
    align-items: start;
}

.footer-column {
    display: flex;
    flex-direction: column;
}

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

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

.footer-nav a {
    color: var(--color-text-white);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.footer-nav a:hover {
    color: var(--color-accent-cream);
}

.contact-info p {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.contact-info a {
    color: var(--color-text-white);
}

.footer-logos {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-end;
}

.footer-logo {
    max-width: 200px;
    height: auto;
}

.partners-logo {
    max-width: 300px;
    height: auto;
}

.footer-copyright {
    background: rgba(0, 0, 0, 0.2);
    padding: 1.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.copyright-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.copyright-text p {
    font-size: 0.9rem;
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
}

.copyright-text a {
    color: var(--color-text-white);
    text-decoration: underline;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-text-white);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--color-primary-teal);
    color: var(--color-text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-accent-gold);
    transform: translateY(-3px);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .publications-grid {
        gap: 1.5rem;
    }
    
    .footer-columns {
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }
    
    .footer-logos {
        align-items: flex-start;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--color-bg-white);
        flex-direction: column;
        padding: 2rem 0;
        box-shadow: var(--shadow-light);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: all 0.3s ease;
        gap: 0;
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-menu li {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid #f0f0f0;
    }
    
    .nav-menu a {
        display: block;
        padding: 15px 20px;
        width: 100%;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: var(--color-bg-light);
    }
    
    .hero-section {
        height: 400px;
        margin-top: 140px;
    }
    
    .slide-title {
        font-size: 2rem;
        padding: 0 1rem;
    }
    
    .main-content {
        padding: 40px 0;
    }
    
    .page-title {
        font-size: 2rem;
        text-align: center;
    }
    
    .publication-info {
        padding: 1rem;
        padding-left: 60px;
    }
    
    .publication-icon {
        left: 1rem;
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }
    
    .publication-title {
        font-size: 1.1rem;
    }
    
    .footer-columns {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .footer-logos {
        align-items: center;
    }
    
    .copyright-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .slide-title {
        font-size: 1.5rem;
    }
    
    .page-title {
        font-size: 1.8rem;
    }
    
    .publication-item {
        margin-bottom: 1rem;
    }
    
    .publication-info {
        padding: 0.75rem;
        padding-left: 50px;
    }
    
    .publication-icon {
        width: 35px;
        height: 35px;
        font-size: 1rem;
        left: 0.75rem;
        top: 0.75rem;
    }
    
    .publication-title {
        font-size: 1rem;
    }
    
    .publication-meta p {
        font-size: 0.9rem;
    }
    
    .read-more-btn {
        font-size: 0.85rem;
        padding: 6px 12px;
    }
    
    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }
}

/* Loading Animation */
@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.publication-icon {
    animation: pulse 2s infinite;
}

/* Hover Effects for Enhanced Interactivity */
.publication-item {
    position: relative;
    overflow: hidden;
}

.publication-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
    z-index: 1;
}

.publication-item:hover::before {
    left: 100%;
}

/* Focus States for Accessibility */
.nav-menu a:focus,
.read-more-btn:focus,
.back-to-top:focus {
    outline: 2px solid var(--color-accent-gold);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .hero-section,
    .footer,
    .back-to-top {
        display: none;
    }
    
    .main-content {
        margin-top: 0;
        padding: 0;
    }
    
    .publication-item {
        break-inside: avoid;
        margin-bottom: 1rem;
        box-shadow: none;
        border: 1px solid var(--color-border-light);
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .publication-item {
        border: 2px solid #000;
    }
    
    .publication-title a {
        text-decoration: underline;
    }
    
    .read-more-btn {
        border-width: 2px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}