/* Vibrant Color Scheme */
:root {
    --primary: #2980b9;       /* Deep blue */
    --secondary: #e74c3c;     /* Vibrant red */
    --accent: #f39c12;        /* Orange */
    --proof: #27ae60;         /* Green */
    --light: #ecf0f1;
    --dark: #2c3e50;
    --text: #333;
    --bg: #f9f9f9;
    --card-bg: #ffffff;
    --nav-bg: #2c3e50;
}

/* Dark Mode */
.dark-mode {
    --primary: #3498db;
    --secondary: #e74c3c;
    --text: #ecf0f1;
    --bg: #2c3e50;
    --card-bg: #34495e;
    --nav-bg: #1a252f;
}

/* Base Styles */
body {
    font-family: 'Lato', sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    margin: 0;
    padding: 0;
    transition: all 0.3s ease;
}

h1, h2, h3 {
    font-family: 'Merriweather', serif;
    color: var(--primary);
}
/* ... (previous styles remain the same until navigation section) ... */

/* Fixed Navigation with Smooth Transition */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    color: white;
    padding: 1rem 2rem;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: padding 0.3s ease;
}

.header-content {
    transition: all 0.3s ease;
    height: auto;
    overflow: hidden;
}

.main-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    padding: 0.5rem 0;
    transition: all 0.3s ease;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.nav-link i {
    font-size: 1.2rem;
    min-width: 1.2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.nav-text {
    transition: all 0.3s ease;
    white-space: nowrap;
    display: inline-block;
    max-width: 100px;
    overflow: hidden;
}

.theme-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0 0.5rem;
    margin-left: 1rem;
}

/* Collapsed Navigation */
.main-header.scrolled {
    padding: 0.5rem 2rem;
}

.main-header.scrolled .header-content {
    height: 0;
    opacity: 0;
}

.main-header.scrolled .nav-text {
    max-width: 0;
    opacity: 0;
    margin-left: 0;
}

.main-header.scrolled .nav-link {
    padding: 0.5rem;
}

/* Talks Section */
.talks-section {
    margin: 4rem 0;
}

.talk-category {
    margin-bottom: 3rem;
}

.talk-category h3 {
    border-bottom: 2px solid var(--accent);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.talk-item {
    background: var(--card-bg);
    padding: 1.2rem;
    margin-bottom: 1rem;
    border-radius: 6px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    border-left: 3px solid var(--primary);
}

.talk-title {
    font-weight: bold;
    margin-bottom: 0.3rem;
}

.talk-meta {
    color: var(--text);
    opacity: 0.8;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.talk-links {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.talk-link {
    color: var(--secondary);
    text-decoration: none;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.talk-link:hover {
    text-decoration: underline;
}

.external-link {
    color: var(--secondary);
    font-size: 0.8em;
    margin-left: 0.5rem;
}

/* Teaching Section */
.teaching-section {
    margin: 4rem 0;
}

.teaching-category {
    margin-bottom: 3rem;
}

.teaching-category h3 {
    border-bottom: 2px solid var(--proof);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.teaching-item {
    background: var(--card-bg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.08);
}

.course-title {
    font-weight: bold;
    margin-bottom: 0.3rem;
}

.course-title a {
    color: var(--primary);
    text-decoration: none;
}

.course-title a:hover {
    text-decoration: underline;
}

.course-meta {
    color: var(--text);
    opacity: 0.8;
    font-style: italic;
    margin-bottom: 1rem;
}

.course-responsibilities {
    padding-left: 1.5rem;
    margin-top: 0.5rem;
}

.course-responsibilities li {
    margin-bottom: 0.5rem;
}

/* Adjust content wrapper for fixed header */
.content-wrapper {
    padding-top: 180px; /* Adjust based on your header height */
    transition: padding-top 0.3s ease;
}

.main-header.scrolled + .content-wrapper {
    padding-top: 80px; /* Reduced when header is collapsed */
}

/* ... (rest of the existing styles remain the same) ... */

/* Main Content */
.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* About Section */
.about-section {
    display: flex;
    gap: 3rem;
    margin: 3rem 0;
    align-items: center;
}

.profile-container {
    flex: 1;
    max-width: 300px;
    position: relative;
}

.profile-img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    border: 3px solid var(--primary);
}

.profile-img:hover {
    transform: translateY(-5px);
}

.complexity-badge {
    position: absolute;
    top: -15px;
    right: -15px;
    background: var(--secondary);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.about-text {
    flex: 2;
}

.research-focus {
    background: rgba(39, 174, 96, 0.1);
    border-left: 3px solid var(--proof);
    padding: 0.8rem;
    margin-top: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Research Section */
.research-section {
    margin: 4rem 0;
}

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.interest-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 4px solid var(--accent);
}

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

.interest-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.card-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

/* Publications Section */
.publications-section {
    margin: 4rem 0;
}

.publication-category {
    margin-bottom: 3rem;
}

.publication-category h3 {
    position: relative;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary);
}

.publication-item {
    background: var(--card-bg);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-left: 4px solid var(--primary);
}

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

.pub-title {
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.pub-authors {
    color: var(--text);
    opacity: 0.8;
    font-style: italic;
    margin-bottom: 1rem;
}

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

.pub-link {
    color: var(--secondary);
    text-decoration: none;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    border: 1px solid var(--secondary);
}

.pub-link:hover {
    background: var(--secondary);
    color: white;
}

/* Footer */
.main-footer {
    background: var(--nav-bg);
    color: white;
    padding: 2rem;
    margin-top: 3rem;
}

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

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

.contact-info i {
    margin-right: 0.5rem;
}

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

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.social-links a {
    color: white;
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.social-links a:hover {
    transform: translateY(-3px);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
}

.modal-content {
    background: var(--bg);
    margin: 2rem auto;
    padding: 2rem;
    width: 80%;
    max-width: 800px;
    border-radius: 8px;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
    border-left: 5px solid var(--primary);
}

.close-modal {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
}

#modal-body {
    padding: 1rem 0;
}

#modal-body h3 {
    margin-top: 0;
    color: var(--primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .about-section {
        flex-direction: column;
    }
    
    .profile-container {
        max-width: 200px;
        margin: 0 auto 1.5rem;
    }
    
    .main-nav {
        gap: 1rem;
        flex-wrap: wrap;
    }
    
    .pub-links {
        flex-direction: column;
    }
    
    .modal-content {
        width: 90%;
        padding: 1.5rem;
    }
    
    .interests-grid {
        grid-template-columns: 1fr;
    }
    
    .main-header.scrolled .main-nav {
        justify-content: space-around;
    }
}