/* CSS Variables */
:root {
    --primary-navy: #1e3a8a;
    --secondary-charcoal: #374151;
    --accent-blue: #3b82f6;
    --light-gray: #f9fafb;
    --white: #ffffff;
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --dark-text: #e2e8f0;
    --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--secondary-charcoal);
    background: var(--white);
    transition: all 0.3s ease;
    scroll-behavior: smooth;
}

body.dark-mode {
    background: var(--dark-bg);
    color: var(--dark-text);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.8rem; }
h4 { font-size: 1.5rem; }

p {
    margin-bottom: 1rem;
    font-weight: 400;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.dark-mode .header {
    background: rgba(15, 23, 42, 0.95);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav {
    padding: 1rem 0;
}

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

.logo h2 {
    color: var(--primary-navy);
    font-size: 1.5rem;
    margin: 0;
}

.dark-mode .logo h2 {
    color: var(--accent-blue);
}

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

.nav-link {
    text-decoration: none;
    color: var(--secondary-charcoal);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--accent-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--accent-blue);
    transition: width 0.3s ease;
}

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

.dark-mode .nav-link {
    color: var(--dark-text);
}

.nav-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.theme-toggle,
.mobile-menu-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--secondary-charcoal);
    transition: color 0.3s ease;
}

.theme-toggle:hover,
.mobile-menu-toggle:hover {
    color: var(--accent-blue);
}

.dark-mode .theme-toggle,
.dark-mode .mobile-menu-toggle {
    color: var(--dark-text);
}

.mobile-menu-toggle {
    display: none;
}

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, var(--light-gray) 0%, rgba(59, 130, 246, 0.05) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.dark-mode .hero {
    background: linear-gradient(135deg, var(--dark-bg) 0%, rgba(30, 58, 138, 0.1) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    align-items: center;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.profile-photo {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow-large);
    border: 6px solid var(--white);
    transition: transform 0.3s ease;
}

.profile-photo:hover {
    transform: scale(1.05);
}

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

.hero-title {
    font-size: 4rem;
    color: var(--primary-navy);
    margin-bottom: 0.5rem;
}

.dark-mode .hero-title {
    color: var(--dark-text);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--accent-blue);
    margin-bottom: 2rem;
    font-weight: 500;
}

.hero-affiliations {
    margin-bottom: 2rem;
}

.hero-affiliations p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.hero-affiliations i {
    color: var(--accent-blue);
    width: 20px;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-navy);
    font-family: 'JetBrains Mono', monospace;
}

.dark-mode .stat-number {
    color: var(--accent-blue);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--secondary-charcoal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.dark-mode .stat-label {
    color: var(--dark-text);
}

.hero-cta {
    display: flex;
    gap: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: var(--primary-navy);
}

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

.btn-secondary {
    background: transparent;
    color: var(--primary-navy);
    border-color: var(--primary-navy);
}

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

.dark-mode .btn-secondary {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

.dark-mode .btn-secondary:hover {
    background: var(--accent-blue);
    color: var(--dark-bg);
}

/* Sections */
.section {
    padding: 5rem 0;
}

.bg-light {
    background: var(--light-gray);
}

.dark-mode .bg-light {
    background: var(--dark-card);
}

.section-title {
    text-align: center;
    color: var(--primary-navy);
    margin-bottom: 3rem;
    position: relative;
}

.dark-mode .section-title {
    color: var(--dark-text);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--accent-blue);
    border-radius: 2px;
}

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

.about-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.dark-mode .about-card {
    background: var(--dark-card);
}

.about-card h3 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dark-mode .about-card h3 {
    color: var(--accent-blue);
}

.about-card i {
    font-size: 1.5rem;
}

/* Research Section */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.research-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

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

.dark-mode .research-card {
    background: var(--dark-card);
}

.research-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--white);
}

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

.dark-mode .research-card h3 {
    color: var(--accent-blue);
}

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

.pub-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.pub-stat-card {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-medium);
}

.pub-stat-card h3 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
}

.pub-stat-card p {
    font-size: 1.1rem;
    margin: 0;
    opacity: 0.9;
}

.journal-list {
    margin-bottom: 3rem;
}

.journal-list h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-navy);
}

.dark-mode .journal-list h3 {
    color: var(--dark-text);
}

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

.journal-item {
    background: var(--white);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    border-left: 4px solid var(--accent-blue);
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

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

.dark-mode .journal-item {
    background: var(--dark-card);
    color: var(--dark-text);
}

.awards-section h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-navy);
}

.dark-mode .awards-section h3 {
    color: var(--dark-text);
}

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

.award-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

.award-item:hover {
    transform: translateY(-3px);
}

.dark-mode .award-item {
    background: var(--dark-card);
    color: var(--dark-text);
}

.award-item i {
    font-size: 1.5rem;
    color: var(--accent-blue);
    min-width: 24px;
}

/* News Section */
.news-timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.news-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: var(--accent-blue);
    border-radius: 2px;
}

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 20px;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background: var(--accent-blue);
    border-radius: 50%;
    border: 4px solid var(--white);
    z-index: 2;
}

.dark-mode .timeline-item::before {
    border-color: var(--dark-bg);
}

.timeline-date {
    flex: 0 0 120px;
    font-weight: 600;
    color: var(--accent-blue);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    display: flex;
    align-items: flex-start;
    padding-top: 0.5rem;
}

.timeline-item:nth-child(even) .timeline-date {
    justify-content: flex-end;
    padding-left: 2rem;
}

.timeline-item:nth-child(odd) .timeline-date {
    justify-content: flex-start;
    padding-right: 2rem;
}

.timeline-content {
    flex: 1;
    background: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    margin: 0 2rem;
    position: relative;
}

.dark-mode .timeline-content {
    background: var(--dark-card);
}

.timeline-content h3 {
    color: var(--primary-navy);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.dark-mode .timeline-content h3 {
    color: var(--accent-blue);
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 20px;
    width: 0;
    height: 0;
    border: 10px solid transparent;
}

.timeline-item:nth-child(odd) .timeline-content::before {
    left: -20px;
    border-right-color: var(--white);
}

.timeline-item:nth-child(even) .timeline-content::before {
    right: -20px;
    border-left-color: var(--white);
}

.dark-mode .timeline-item:nth-child(odd) .timeline-content::before {
    border-right-color: var(--dark-card);
}

.dark-mode .timeline-item:nth-child(even) .timeline-content::before {
    border-left-color: var(--dark-card);
}

/* Editorial Section */
.editorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.editorial-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-light);
}

.dark-mode .editorial-card {
    background: var(--dark-card);
}

.editorial-card h3 {
    color: var(--primary-navy);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.dark-mode .editorial-card h3 {
    color: var(--accent-blue);
}

.editorial-card ul {
    list-style: none;
}

.editorial-card li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

.editorial-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: bold;
}

.editorial-card strong {
    color: var(--primary-navy);
}

.dark-mode .editorial-card strong {
    color: var(--accent-blue);
}

/* Collaboration Section */
.collab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
    margin-bottom: 4rem;
}

.collab-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: transform 0.3s ease;
}

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

.dark-mode .collab-card {
    background: var(--dark-card);
}

.collab-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--white);
}

.collab-card h3 {
    color: var(--primary-navy);
    margin-bottom: 1.5rem;
}

.dark-mode .collab-card h3 {
    color: var(--accent-blue);
}

.collab-card p {
    margin-bottom: 1rem;
    text-align: left;
}

.partners-section h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-navy);
}

.dark-mode .partners-section h3 {
    color: var(--dark-text);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.partner-item {
    background: var(--white);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    color: var(--primary-navy);
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

.partner-item:hover {
    transform: scale(1.05);
}

.dark-mode .partner-item {
    background: var(--dark-card);
    color: var(--accent-blue);
}

/* Footer */
.footer {
    background: var(--primary-navy);
    color: var(--white);
    padding: 3rem 0 1rem;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

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

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

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

.footer-section a:hover {
    color: var(--white);
}

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

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: background 0.3s ease;
}

.social-links a:hover {
    background: var(--accent-blue);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 1rem;
    text-align: center;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1rem 0;
        box-shadow: var(--shadow-medium);
    }
    
    .dark-mode .nav-menu {
        background: var(--dark-bg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-cta {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .timeline-item {
        flex-direction: column !important;
        align-items: center;
    }
    
    .timeline-item:nth-child(even) {
        flex-direction: column !important;
    }
    
    .news-timeline::before {
        display: none;
    }
    
    .timeline-item::before {
        display: none;
    }
    
    .timeline-content {
        margin: 0;
        margin-top: 1rem;
    }
    
    .timeline-content::before {
        display: none;
    }
    
    .timeline-date {
        flex: none;
        padding: 0;
        justify-content: center !important;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.8rem; }
    h3 { font-size: 1.4rem; }
    
    .section {
        padding: 3rem 0;
    }
    
    .about-grid,
    .research-grid,
    .collab-grid,
    .editorial-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 6rem 0 3rem;
    }
    
    .profile-photo {
        width: 200px;
        height: 200px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .pub-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}