/* CSS Reset and Variables */
:root {
    /* Blue Color Scheme */
    --primary-blue: #2563eb;
    --dark-blue: #1e40af;
    --light-blue: #3b82f6;
    --pale-blue: #dbeafe;
    --accent-blue: #60a5fa;
    
    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-light: #6b7280;
    --text-white: #ffffff;
    
    /* Background Colors */
    --bg-white: #ffffff;
    --bg-gray: #f9fafb;
    --bg-light-blue: #eff6ff;
    
    /* Borders and Shadows */
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1);
    
    /* Spacing and Sizing */
    --container-width: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}
/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
    font-size: 1rem;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography Scale */
h1 { font-size: 3.5rem; font-weight: 700; line-height: 1.2; }
h2 { font-size: 2.25rem; font-weight: 600; line-height: 1.3; }
h3 { font-size: 1.5rem; font-weight: 600; line-height: 1.4; }
h4 { font-size: 1.25rem; font-weight: 500; line-height: 1.5; }
p { font-size: 1rem; line-height: 1.7; margin-bottom: 1rem; }

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.875rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.125rem; }
}
/* Header Section */
header {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
    min-height: 450px;
    display: flex;
    align-items: center;
    position: relative;
    color: var(--text-white);
}

.header-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    background-image: radial-gradient(circle at 20% 80%, var(--light-blue) 0%, transparent 50%),
                      radial-gradient(circle at 80% 20%, var(--accent-blue) 0%, transparent 50%);
}

.header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    width: 100%;
    padding: 2rem 0;
}

.animated-title {
    font-family: 'Playfair Display', serif;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 300;
    margin-bottom: 0.5rem;
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.2s both;
}
.affiliation {
    font-size: 1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.header-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 25px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
    font-size: 0.9rem;
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.stat-item i {
    font-size: 1rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
/* Navigation */
nav {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0;
}

.nav-link {
    display: block;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--primary-blue);
    transition: width 0.3s ease;
}
.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue);
    background: var(--bg-light-blue);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 60%;
}

/* Main Content Sections */
main {
    padding: 4rem 0;
}

section {
    margin-bottom: 5rem;
    padding: 0;
}

section h2 {
    margin-bottom: 2.5rem;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 0.75rem;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 2px;
}

.section-number {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 400;
    margin-right: 0.75rem;
    display: inline-block;
}
/* About Section - Fixed Layout */
#about {
    padding-top: 2rem;
}

.about-hero {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 3rem;
    align-items: start;
}

/* About Left Column */
.about-hero-left {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.profile-photo-container {
    position: relative;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

.profile-photo {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    display: block;
}

.photo-accent {
    position: absolute;
    top: -10px;
    left: -10px;
    right: 10px;
    bottom: 10px;
    background: var(--pale-blue);
    border-radius: var(--border-radius);
    z-index: -1;
}
.quick-facts {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.fact-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.fact-item:last-child {
    border-bottom: none;
}

.fact-item i {
    font-size: 1rem;
    color: var(--primary-blue);
    margin-top: 0.25rem;
    width: 20px;
    text-align: center;
}

.fact-item div {
    flex: 1;
}

.fact-item strong {
    display: block;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
}

.fact-item span {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.4;
}
/* About Right Column */
.about-hero-right {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.lead-statement {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin: 0;
    padding: 1.5rem;
    background: var(--bg-light-blue);
    border-left: 4px solid var(--primary-blue);
    border-radius: var(--border-radius);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.about-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
    height: 100%;
}

.about-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--light-blue);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}
.card-header i {
    font-size: 1.25rem;
    color: var(--primary-blue);
}

.card-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin: 0;
}

.about-card p {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin: 0;
}

/* Expertise Section */
.expertise-section {
    background: var(--bg-gray);
    border-radius: var(--border-radius);
    padding: 1.75rem;
}

.expertise-section h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    padding: 0.375rem 0.875rem;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    transition: var(--transition);
}
.tag:hover {
    background: var(--primary-blue);
    color: var(--text-white);
    border-color: var(--primary-blue);
    transform: translateY(-1px);
}

/* Research Section */
.section-intro {
    font-size: 1rem;
    color: var(--text-light);
    text-align: center;
    margin: -1.5rem 0 2rem 0;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.research-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.75rem;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-blue);
    transform: translateY(-100%);
    transition: transform 0.3s ease;
}
.research-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--light-blue);
}

.research-card:hover::before {
    transform: translateY(0);
}

.research-card.active {
    background: var(--bg-light-blue);
    border-color: var(--primary-blue);
}

.card-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--light-blue), var(--primary-blue));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.card-icon i {
    font-size: 1.5rem;
    color: var(--text-white);
}

.research-card h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.pub-count {
    font-size: 0.75rem;
    color: var(--primary-blue);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}
.research-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.explore-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--primary-blue);
    font-weight: 500;
    font-size: 0.875rem;
}

.explore-btn i {
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

.research-card:hover .explore-btn i {
    transform: translateX(3px);
}

/* Projects Timeline */
.current-projects {
    background: var(--bg-gray);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-top: 2rem;
}

.current-projects h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
}

.projects-timeline {
    position: relative;
    padding-left: 3rem;
}
.projects-timeline::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--light-blue);
}

.project-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 2rem;
}

.project-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.25rem;
    width: 14px;
    height: 14px;
    background: var(--bg-white);
    border: 2px solid var(--primary-blue);
    border-radius: 50%;
}

.project-year {
    font-size: 0.8125rem;
    color: var(--primary-blue);
    font-weight: 600;
    margin-bottom: 0.375rem;
}

.project-content h4 {
    font-size: 1.0625rem;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.project-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.5rem;
}
.project-tag {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--primary-blue);
    color: var(--text-white);
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* Impact Section */
.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.impact-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: var(--transition);
}

.impact-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--light-blue);
}

.impact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--light-blue), var(--primary-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.impact-icon i {
    font-size: 1.5rem;
    color: var(--text-white);
}
.impact-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.impact-card ul {
    list-style: none;
    padding: 0;
}

.impact-card li {
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

.impact-card li:last-child {
    border-bottom: none;
}

/* Media Coverage Section */
.media-coverage {
    background: var(--bg-gray);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-bottom: 2rem;
}

.media-coverage h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.media-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}
.media-item {
    background: var(--bg-white);
    padding: 1.25rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.media-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.media-source {
    font-weight: 600;
    color: var(--primary-blue);
    font-size: 0.875rem;
    margin-bottom: 0.375rem;
}

.media-title {
    color: var(--text-primary);
    font-size: 0.9375rem;
    line-height: 1.4;
    margin-bottom: 0.375rem;
}

.media-date {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* Publications Section */
.publication-tabs {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.625rem 1.5rem;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}
.tab-btn:hover {
    background: var(--bg-light-blue);
    border-color: var(--light-blue);
}

.tab-btn.active {
    background: var(--primary-blue);
    color: var(--text-white);
    border-color: var(--primary-blue);
}

.publication-content {
    display: none;
}

.publication-content.active {
    display: block;
}

#publicationDisplay {
    min-height: 150px;
}

.topic-publications h4 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--light-blue);
}

.publication-list {
    list-style: none;
    padding: 0;
}
.publication-item {
    padding: 1.25rem;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 0.75rem;
    transition: var(--transition);
}

.publication-item:hover {
    box-shadow: var(--shadow-sm);
    transform: translateX(2px);
    border-color: var(--light-blue);
}

.publication-item strong {
    color: var(--text-primary);
    display: block;
    font-size: 0.9375rem;
    margin-bottom: 0.375rem;
}

.publication-item em {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Teaching Section */
.teaching-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.teaching-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
}

.teaching-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.teaching-card h4 {
    font-size: 1rem;
    color: var(--primary-blue);
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.teaching-card ul {
    list-style: none;
    padding: 0;
}

.teaching-card li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

.teaching-card li:last-child {
    border-bottom: none;
}
/* Contact Section */
#contact {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
    border-radius: var(--border-radius);
    padding: 3rem;
    color: var(--text-white);
    text-align: center;
    margin-bottom: 2rem;
}

#contact h2 {
    color: var(--text-white);
    margin-bottom: 1.5rem;
}

#contact h2::after {
    background: var(--text-white);
    margin: 0.75rem auto 0;
    left: 50%;
    transform: translateX(-50%);
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
}

.contact-info p {
    margin-bottom: 1.5rem;
    font-size: 1rem;
    opacity: 0.95;
}

.contact-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
}

.contact-item i {
    font-size: 1.25rem;
    margin-bottom: 0.375rem;
}

.contact-item a {
    color: var(--text-white);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition);
}

.contact-item a:hover {
    text-decoration: underline;
    opacity: 0.9;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.social-links a {
    width: 42px;
    height: 42px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--text-white);
    color: var(--primary-blue);
    transform: translateY(-2px);
}
/* Footer */
footer {
    background: var(--text-primary);
    color: var(--text-white);
    text-align: center;
    padding: 1.5rem 0;
    font-size: 0.875rem;
}

/* Utility Classes */
.fade-in {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design - Tablet */
@media (max-width: 1024px) {
    .about-hero {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-hero-left {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }
    
    .profile-photo-container {
        grid-column: 1;
    }
    
    .quick-facts {
        grid-column: 2;
    }
}
/* Responsive Design - Mobile */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    header {
        min-height: 380px;
    }
    
    .header-stats {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }
    
    .stat-item {
        width: 100%;
        max-width: 250px;
        justify-content: center;
    }
    
    nav ul {
        flex-direction: column;
    }
    
    .nav-link {
        width: 100%;
        text-align: center;
        padding: 0.75rem;
    }
    
    .about-hero-left {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .research-grid,
    .impact-grid,
    .teaching-grid,
    .media-items {
        grid-template-columns: 1fr;
    }
    
    .contact-details {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    #contact {
        padding: 2rem 1.5rem;
    }
}

/* Accessibility */
:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    nav, .social-links, .explore-btn {
        display: none;
    }
    
    body {
        font-size: 11pt;
        line-height: 1.4;
    }
    
    .research-card,
    .impact-card {
        page-break-inside: avoid;
    }
}