/* Global Styles */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --spacing-unit: 2rem;
}

body {
    font-family: 'Roboto', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    padding-top: 76px;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
}

/* Navigation */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
}

.nav-link {
    font-weight: 500;
    color: var(--primary-color) !important;
}

/* Hero Section */
.hero-section {
    padding: 6rem 0;
    background-color: var(--light-bg);
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-section h2 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.social-links {
    margin-top: 2rem;
}

.social-links a {
    margin: 0 0.5rem;
}

/* Section Styles */
.section-padding {
    padding: 5rem 0;
}

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

/* Research Timeline */
.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline-item {
    margin-bottom: 3rem;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

.timeline-item h3 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

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

.period {
    color: #666;
    font-style: italic;
}

/* Publications */
.publication-item {
    padding: 2rem;
    margin-bottom: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

.publication-item h3 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.journal {
    color: var(--secondary-color);
    font-style: italic;
}

/* Skills */
.skill-category {
    margin-bottom: 2rem;
}

.skill-list {
    list-style: none;
    padding-left: 0;
}

.skill-list li {
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    background: white;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Contact Section */
.contact-info {
    margin-top: 2rem;
}

.contact-info p {
    margin-bottom: 1rem;
}

.contact-info i {
    margin-right: 0.5rem;
    color: var(--secondary-color);
}

/* Footer */
.footer {
    padding: 2rem 0;
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .hero-section h2 {
        font-size: 1.25rem;
    }
    
    .section-padding {
        padding: 3rem 0;
    }
}