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

body {
    font-family: 'Lato', Arial, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

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

/* Header and Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e0e0e0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    font-size: 24px;
    font-weight: 500;
    color: #182B49;
    text-decoration: none;
    transition: color 0.3s ease;
}

.logo a:hover {
    color: #2c4a75;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 400;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: #182B49;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #182B49;
    transition: width 0.3s ease;
}

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

/* Hero Section */
.hero-section {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
}

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

.profile-image img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center 30%;
    border: 5px solid #ffffff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.hero-text h1 {
    font-size: 48px;
    font-weight: 500;
    color: #182B49;
    margin-bottom: 10px;
}

.hero-text h2 {
    font-size: 24px;
    font-weight: 300;
    color: #666;
    margin-bottom: 20px;
}

.hero-text p {
    font-size: 18px;
    color: #555;
    margin-bottom: 30px;
    max-width: 500px;
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-links a {
    padding: 10px 20px;
    background: #182B49;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 400;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #2c4a75;
    transform: translateY(-2px);
}

/* Content Sections */
.content-section {
    padding: 80px 0;
}

.content-section:nth-child(even) {
    background: #f8f9fa;
}

.content-section h2 {
    font-size: 36px;
    font-weight: 500;
    color: #182B49;
    margin-bottom: 40px;
    text-align: center;
}

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

.about-content p {
    font-size: 18px;
    margin-bottom: 20px;
    color: #555;
}

/* Experience Section */
.experience-list {
    max-width: 800px;
    margin: 0 auto;
}

.experience-item {
    background: white;
    padding: 30px;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #182B49;
}

.experience-item h3 {
    font-size: 24px;
    font-weight: 500;
    color: #182B49;
    margin-bottom: 5px;
}

.experience-item h4 {
    font-size: 18px;
    font-weight: 400;
    color: #666;
    margin-bottom: 10px;
}

.experience-item .date {
    font-size: 14px;
    color: #888;
    font-style: italic;
    display: block;
    margin-bottom: 15px;
}

.experience-item p {
    color: #555;
}

/* Skills Section */
.skills-content {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.skills-category {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-top: 4px solid #182B49;
}

.skills-category h3 {
    font-size: 20px;
    font-weight: 500;
    color: #182B49;
    margin-bottom: 20px;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    background: #f8f9fa;
    color: #182B49;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.skill-tag:hover {
    background: #182B49;
    color: white;
    transform: translateY(-2px);
}

.achievements-list {
    list-style: none;
    padding: 0;
}

.achievements-list li {
    padding: 8px 0;
    border-bottom: 1px solid #e9ecef;
    color: #555;
    position: relative;
    padding-left: 20px;
}

.achievements-list li:before {
    content: '🏆';
    position: absolute;
    left: 0;
    top: 8px;
}

.achievements-list li:last-child {
    border-bottom: none;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.project-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.project-image {
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.project-item:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: 25px;
}

.project-content h3 {
    font-size: 22px;
    font-weight: 500;
    color: #182B49;
    margin-bottom: 15px;
}

.project-content p {
    color: #555;
    margin-bottom: 20px;
}

.project-links {
    display: flex;
    gap: 15px;
}

.project-links a {
    padding: 8px 16px;
    background: #f8f9fa;
    color: #182B49;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.project-links a:hover {
    background: #182B49;
    color: white;
}

/* Publications Section */
.publications-list {
    max-width: 1000px;
    margin: 0 auto;
}

.publication-item {
    display: flex;
    background: white;
    padding: 30px;
    margin-bottom: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    gap: 25px;
    transition: transform 0.3s ease;
}

.publication-item:hover {
    transform: translateX(10px);
}

.publication-image {
    flex-shrink: 0;
    width: 120px;
    height: 80px;
    overflow: hidden;
    border-radius: 5px;
}

.publication-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.publication-content h3 {
    font-size: 20px;
    font-weight: 500;
    color: #182B49;
    margin-bottom: 10px;
    line-height: 1.3;
}

.publication-content .authors {
    font-size: 16px;
    color: #666;
    margin-bottom: 5px;
}

.publication-content .venue {
    font-size: 14px;
    color: #888;
    font-style: italic;
    margin-bottom: 15px;
}

.publication-links {
    display: flex;
    gap: 15px;
}

.publication-links a {
    padding: 6px 12px;
    background: #f8f9fa;
    color: #182B49;
    text-decoration: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.publication-links a:hover {
    background: #182B49;
    color: white;
}

/* Contact Section */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-content p {
    font-size: 18px;
    color: #555;
    margin-bottom: 30px;
}

.contact-info {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.contact-info p {
    font-size: 16px;
    margin-bottom: 15px;
    text-align: left;
}

.contact-info strong {
    color: #182B49;
}

/* Footer */
footer {
    background: #182B49;
    color: white;
    text-align: center;
    padding: 30px 0;
}

footer p {
    font-size: 14px;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }
    
    .profile-image img {
        width: 200px;
        height: 200px;
    }
    
    .hero-text h1 {
        font-size: 36px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .publication-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .publication-image {
        width: 100%;
        height: 150px;
    }
    
    .social-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-section {
        padding: 100px 0 60px;
    }
    
    .content-section {
        padding: 60px 0;
    }
    
    .hero-text h1 {
        font-size: 28px;
    }
    
    .content-section h2 {
        font-size: 28px;
    }
}