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

:root {
    --primary-color: #57068c;
    --secondary-color: #8900e1;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --accent-color: #57068c;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

html {
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-brand a:hover {
    color: var(--secondary-color);
}

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

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Profile Section */
.profile-section {
    display: flex;
    align-items: center;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 0;
}

.profile-image {
    flex-shrink: 0;
}

.profile-image img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.profile-info {
    flex: 1;
}

.profile-name {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.profile-title {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.profile-institution {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.social-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border: 2px solid var(--primary-color);
    border-radius: 0.375rem;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Research Section */
.research-list {
    max-width: 900px;
    margin: 0 auto;
}

.research-paper {
    background-color: var(--bg-white);
    padding: 2.5rem;
    margin-bottom: 3rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.research-paper:hover {
    box-shadow: var(--shadow-lg);
}

.paper-title-link {
    text-decoration: none;
    color: var(--text-dark);
    transition: color 0.3s ease;
}

.paper-title-link:hover {
    color: var(--primary-color);
}

.paper-title-link h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.research-paper .authors {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.research-paper .paper-image {
    width: 100%;
    max-width: 800px;
    height: auto;
    display: block;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 1.5rem;
    border-radius: 0.25rem;
    box-shadow: var(--shadow-sm);
}

/* Responsive image sizing */
@media (max-width: 1200px) {
    .research-paper .paper-image {
        max-width: 700px;
    }
}

@media (max-width: 992px) {
    .research-paper .paper-image {
        max-width: 600px;
    }
}

@media (max-width: 768px) {
    .research-paper .paper-image {
        max-width: 100%;
    }
}

.research-paper .abstract {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 1rem;
    text-align: justify;
}

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

.section-alt {
    background-color: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

/* Teaching Section */
.teaching-section {
    max-width: 900px;
    margin: 0 auto;
}

.teaching-heading {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    color: var(--text-dark);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.teaching-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
    border-left: 2px solid var(--border-color);
}

.teaching-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0 1rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

.teaching-year {
    font-weight: 700;
    color: var(--primary-color);
    min-width: 80px;
}

.teaching-details {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.teaching-role {
    font-weight: 700;
    color: var(--text-dark);
}

.teaching-note {
    color: var(--text-light);
    font-style: italic;
}


/* Footer */
.footer {
    background-color: var(--text-dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

.footer p {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
    }
    
    .profile-section {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    
    .profile-image img {
        width: 200px;
        height: 200px;
    }
    
    .profile-name {
        font-size: 2.5rem;
    }
    
    .profile-title {
        font-size: 1.25rem;
    }
    
    .profile-institution {
        font-size: 1.125rem;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .profile-name {
        font-size: 2rem;
    }
    
    .profile-image img {
        width: 180px;
        height: 180px;
    }
}