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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #34495e 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid white;
    box-shadow: var(--shadow-hover);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-top: 20px;
}

.subtitle {
    font-size: 1.3rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Navigation */
.navbar {
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 15px 20px;
}

.navbar a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.navbar a:hover {
    background-color: var(--bg-light);
    color: var(--secondary-color);
}

/* Sections */
.section {
    padding: 60px 0;
}

.section:nth-child(even) {
    background-color: var(--bg-light);
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--primary-color);
    text-align: center;
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.qualifications,
.awards,
.experience {
    margin-top: 40px;
    padding: 25px;
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.qualifications h3,
.awards h3,
.experience h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.qualifications ul,
.awards ul,
.experience ul {
    list-style: none;
    padding-left: 0;
}

.qualifications li,
.awards li,
.experience li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
}

.qualifications li:before,
.awards li:before,
.experience li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.project-card {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.project-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.project-card p {
    color: var(--text-light);
    margin-bottom: 15px;
}

.project-description {
    font-size: 0.95rem;
    line-height: 1.6;
}

.project-link {
    display: inline-block;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    margin-top: 10px;
    transition: color 0.3s ease;
}

.project-link:hover {
    color: var(--accent-color);
}

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

.publication-item {
    background: white;
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--secondary-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.publication-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-hover);
}

.publication-item h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.2rem;
    line-height: 1.4;
}

.authors {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 8px;
}

.journal {
    color: var(--text-light);
    margin-bottom: 10px;
}

.pub-link {
    display: inline-block;
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.pub-link:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Contact Section */
.contact-info {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.contact-info p {
    margin-bottom: 15px;
    font-size: 1.1rem;
}

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

.contact-info a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
}

footer p {
    opacity: 0.8;
}

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

    .subtitle {
        font-size: 1.1rem;
    }

    .profile-image {
        width: 150px;
        height: 150px;
    }

    .navbar .container {
        flex-direction: column;
        gap: 10px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 40px 0;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}