/* Base styles */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --medium-gray: #ddd;
    --dark-gray: #777;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Source Sans Pro', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: white;
    font-size: 20px;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 60px 0;
    border-bottom: 1px solid var(--medium-gray);
}

h1, h2, h3, h4 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

h1 {
    font-size: 3.25rem;
}

h2 {
    font-size: 2.5rem;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--secondary-color);
    display: inline-block;
    margin-bottom: 30px;
}

h3 {
    font-size: 2rem;
    margin-top: 30px;
}

p {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Header */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 30px 0;
    position: relative;
}

header h1 {
    color: white;
    margin-bottom: 5px;
}

header .subtitle {
    font-size: 1.2rem;
    margin-bottom: 20px;
    font-weight: 300;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
}

nav li {
    margin-right: 20px;
    margin-bottom: 10px;
}

nav a {
    color: white;
    font-weight: 600;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    font-size: 1.3rem;
}

nav a:hover {
    color: white;
    border-bottom: 2px solid white;
}

/* Profile section */
.profile {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
}

.profile-image {
    flex: 0 0 350px;
    text-align: center;
}

.profile-image img {
    border-radius: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    max-width: 100%;
    aspect-ratio: 1/1;
    object-fit: cover;
    width: 320px;
    height: 320px;
}

.profile-title {
    margin-top: 15px;
    font-weight: 600;
    font-size: 1.4rem;
    color: var(--primary-color);
}

.profile-content {
    flex: 1;
    min-width: 300px;
}

.social-links {
    margin-top: 15px;
    text-align: center;
}

.social-links a {
    font-size: 1.9rem;
    margin-right: 15px;
    color: var(--dark-gray);
}

.social-links a:hover {
    color: var(--secondary-color);
}

/* Research section */
.research-item {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--medium-gray);
}

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

/* Publications section */
.publication {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--medium-gray);
}

.publication:last-child {
    border-bottom: none;
}

.publication-title {
    font-weight: 700;
    font-size: 1.3rem;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.publication-authors {
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.publication-journal {
    font-style: italic;
    color: var(--dark-gray);
    margin-bottom: 15px;
}

.publication-links {
    margin-top: 15px;
}

.button {
    display: inline-block;
    padding: 6px 18px;
    background-color: var(--light-gray);
    border: 1px solid var(--medium-gray);
    border-radius: 4px;
    margin-right: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.button:hover {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

/* CV section */
.cv-item {
    display: flex;
    margin-bottom: 30px;
}

.cv-year {
    flex: 0 0 150px;
    font-weight: 600;
    color: var(--dark-gray);
}

.cv-content {
    flex: 1;
}

.cv-content h4 {
    margin-bottom: 5px;
}

/* Contact section */
.contact-info p {
    margin-bottom: 15px;
}

.contact-info i {
    margin-right: 10px;
    color: var(--secondary-color);
}

/* Footer */
footer {
    background-color: var(--light-gray);
    padding: 20px 0;
    text-align: center;
    color: var(--dark-gray);
    font-size: 1rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .profile {
        flex-direction: column;
        text-align: center;
    }
    
    .profile-image {
        margin-bottom: 20px;
    }
    
    .cv-item {
        flex-direction: column;
    }
    
    .cv-year {
        margin-bottom: 5px;
    }
}