:root {
    --primary-color: #2d3e50; /* Deep navy blue */
    --secondary-color: #3498db; /* Bright blue for accents */
    --accent-color: #e74c3c; /* Warm accent for highlights */
    --background-color: #f8f9fa;
    --nav-background: rgba(45, 62, 80, 0.97);
    --text-color: #2d3748;
    --light-text: #ecf0f1;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --hover-bg: rgba(52, 152, 219, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    padding-top: 60px; /* Space for fixed nav */
}

/* Navigation Styles */
.nav-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--nav-background);
    z-index: 1000;
    box-shadow: var(--shadow);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-name {
    color: var(--light-text);
    font-size: 1.2rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--light-text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background-color: var(--secondary-color);
    color: var(--light-text);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--light-text);
    margin: 5px 0;
    transition: all 0.3s ease;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    padding: 3rem 0;
    background-color: white;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.profile-section {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--secondary-color);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.profile-image:hover {
    transform: scale(1.05);
}

.profile-info {
    text-align: left;
}

h1 {
    margin: 0;
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin: 1.5rem 0;
    font-weight: 600;
}

.profile-title {
    color: var(--secondary-color);
    font-size: 1.2rem;
    margin: 0.5rem 0;
    font-weight: 500;
}

section {
    background: white;
    padding: 2rem;
    margin: 2rem 0;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease;
    border-top: 4px solid var(--secondary-color);
}

section:hover {
    transform: translateY(-2px);
}

.research-interests li, 
.publications li {
    margin-bottom: 1rem;
    list-style-position: inside;
}

.contact-info {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.contact-info a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
    border: 1px solid var(--secondary-color);
}

.contact-info a:hover {
    background-color: var(--secondary-color);
    color: white;
}

.publication-year {
    color: var(--secondary-color);
    font-weight: 600;
}

.project-title {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.education-item {
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 3px solid var(--secondary-color);
}

.education-year {
    color: var(--secondary-color);
    font-weight: 500;
}

footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-color);
    opacity: 0.8;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.skill-category {
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: 6px;
    box-shadow: var(--shadow);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.skill-category p {
    color: var(--text-color);
    line-height: 1.6;
}

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

.experience-item {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.experience-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3e50;
    margin-bottom: 0.5rem;
}

.experience-org {
    color: #3498db;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.experience-date {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.experience-details {
    list-style: disc;
    padding-left: 1.5rem;
    color: #555;
}

.experience-details li {
    margin-bottom: 0.5rem;
}

.publication-category {
    margin-bottom: 2rem;
}

.publication-category h3 {
    color: #2d3e50;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #3498db;
}

.publications li {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.publication-year {
    display: inline-block;
    background: #3498db;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.advisor {
    color: #666;
    font-style: italic;
    margin-top: 0.25rem;
}

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

.awards-list li {
    margin-bottom: 1rem;
    padding: 1rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.award-year {
    display: inline-block;
    background: #e74c3c;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    margin-right: 0.5rem;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3e50;
    margin-bottom: 0.5rem;
}

.project-date {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.project-tech {
    margin-top: 0.5rem;
    color: #3498db;
    font-size: 0.9rem;
}

/* Blog Styles */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.blog-post {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.blog-post:hover {
    transform: translateY(-5px);
}

.blog-post-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

.blog-post:hover .blog-post-image img {
    transform: scale(1.05);
}

.blog-post-content {
    padding: 1.5rem;
}

.blog-post-date {
    display: block;
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.blog-post h2 {
    font-size: 1.25rem;
    color: #2d3e50;
    margin-bottom: 1rem;
}

.blog-post-excerpt {
    color: #555;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.read-more {
    display: inline-block;
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: #2980b9;
}

/* Individual Blog Post Page Styles */
.blog-post-page {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.blog-post-header {
    text-align: center;
    margin-bottom: 2rem;
}

.blog-post-header h1 {
    font-size: 2.5rem;
    color: #2d3e50;
    margin-bottom: 1rem;
}

.blog-post-meta {
    color: #666;
    font-size: 1rem;
}

.blog-post-meta span {
    margin: 0 0.5rem;
}

.blog-post-feature-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.blog-post-section {
    margin-bottom: 2rem;
}

.blog-post-section h2 {
    color: #2d3e50;
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.blog-post-section h3 {
    color: #3498db;
    font-size: 1.25rem;
    margin: 1.5rem 0 0.75rem;
}

.blog-post-section p {
    color: #333;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.blog-post-section ul {
    list-style-type: disc;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.blog-post-section li {
    color: #333;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.blog-post-navigation {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

.back-to-blog {
    display: inline-block;
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.back-to-blog:hover {
    color: #2980b9;
}

.image-attribution {
    font-size: 0.8rem;
    color: #666;
    text-align: center;
    margin-top: 0.5rem;
    font-style: italic;
}

@media (max-width: 768px) {
    body {
        padding-top: 50px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--nav-background);
        flex-direction: column;
        padding: 1rem;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .container {
        padding: 1rem;
    }
    
    header {
        padding: 2rem 0;
    }

    .profile-section {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }

    .profile-info {
        text-align: center;
    }
    
    .profile-image {
        width: 150px;
        height: 150px;
    }
    
    section {
        padding: 1.5rem;
        margin: 1rem 0;
    }
    
    .contact-info {
        justify-content: center;
    }

    h1 {
        font-size: 2rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .experience-item,
    .publications li,
    .awards-list li {
        padding: 1rem;
    }

    .blog-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .blog-post-header h1 {
        font-size: 2rem;
    }

    .blog-post-section h2 {
        font-size: 1.5rem;
    }

    .blog-post-section h3 {
        font-size: 1.2rem;
    }
}