:root {
    --primary-color: #2563eb;
    --primary-light: #60a5fa;
    --primary-dark: #1d4ed8;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --accent-color: #3b82f6;
    --transition: all 0.3s ease;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --primary-color: #60a5fa;
    --primary-light: #93c5fd;
    --primary-dark: #2563eb;
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --accent-color: #60a5fa;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
        Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
}

.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--bg-primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.nav-links a.active {
    color: var(--primary-color);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 70px;
    background-color: var(--bg-secondary);
    padding: 2rem;
}

.hero-content {
    max-width: 800px;
    animation: fadeIn 1s ease-out;
}

.profile-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    margin-bottom: 2rem;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: var(--card-shadow);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-text {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

.social-links a {
    color: var(--text-primary);
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.section-subtitle {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
    align-items: start;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.skills-highlight {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--card-shadow);
}

.skills-highlight h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.skills-highlight ul {
    list-style: none;
}

.skills-highlight li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.skills-highlight li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

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

.skills-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.skills-category p {
    color: var(--text-secondary);
    line-height: 1.5;
}

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

.education-card {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.education-card:hover {
    transform: translateY(-5px);
}

.education-header h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

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

.duration {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.achievements {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.coursework h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.coursework p {
    color: var(--text-secondary);
}

.experience-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.experience-item h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.experience-item h3 span {
    font-size: 1rem;
    color: var(--text-secondary);
    display: block;
    margin-top: 0.5rem;
}

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

.experience-item ul li {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.5;
}

.experience-item ul li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.experience-gap {
    height: 0rem;
}

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

.project-card {
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--card-shadow);
}

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

.project-content {
    padding: 1.5rem;
}

.project-content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tech-stack span {
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
}

.project-links a {
    text-decoration: none;
    color: var(--primary-dark);
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
    margin-right: 1rem;
}

.project-links a:hover {
    color: var(--primary-light);
}

.publications-list {
    display: grid;
    gap: 1.5rem;
    margin-top: 2rem;
}

.publication-item {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.publication-item:hover {
    transform: translateY(-3px);
}

.publication-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    line-height: 1.4;
}

.authors {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.journal {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.paper-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    display: inline-block;
}

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

.resume-viewer {
    margin: 2rem 0;
}

.resume-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    margin-top: 1rem;
}

.resume-button:hover {
    background-color: var(--primary-dark);
}



footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    transition: var(--transition);
}

#theme-toggle:hover {
    color: var(--primary-color);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.25rem;
    }

    .section {
        padding: 6rem 1rem;
    }

    .contact-container {
        flex-direction: column;
    }
}

.contact-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    margin-top: 2rem;
    padding: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    font-size: 1.1rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.contact-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    font-size: 1.2rem;
}

.social-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.social-links a i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

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

/* Desktop view (default) */
.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links-container {
    position: static;
    display: flex;
    gap: 1.5rem;
    background: none;
    box-shadow: none;
    transition: none;
    height: auto;
    width: auto;
}

/* Hide mobile menu toggle button on larger screens */
.mobile-menu-toggle {
    display: none;
}

/* Mobile view (max-width: 768px) */
@media (max-width: 768px) {
    .nav-links-container {
        position: fixed;
        top: 0;
        right: -100%; /* Hidden initially */
        height: 100%; /* Full screen height */
        width: 250px; /* Set width for the sliding menu */
        background-color: black; /* Apply black background to the entire navbar */
        box-shadow: var(--card-shadow);
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem;
        gap: 1rem;
        transition: var(--transition);
        z-index: 1100; /* Ensure it appears above other content */
    }

    .nav-links-container.active {
        right: 0;
    }

    .nav-links-container a {
        display: block;
        width: 100%;
        padding: 0.5rem 1rem;
        color: white; /* Ensure text is visible on a black background */
        text-decoration: none;
        transition: background-color 0.3s ease;
    }

    .nav-links-container a:hover {
        background-color: var(--primary-dark); /* Optional hover effect */
    }

    .mobile-menu-toggle {
        display: block;
        background: black;
        border: none;
        color: var(--text-primary);
        font-size: 1.5rem;
        cursor: pointer;
    }

    .mobile-menu-toggle:hover {
        color: var(--primary-color);
    }
}

/* General link styling for navigation */
.nav-links-container a {
    text-decoration: none;
    color: var(--text-primary); /* Set your desired default color */
    font-weight: 500;
    position: relative;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* Styling for active links */
.nav-links-container a.active {
    color: var(--primary-color); /* Highlight active link */
}

/* Styling for hover state */
.nav-links-container a:hover {
    color: var(--primary-dark); /* Change color on hover */
}

/* Ensure visited links do not change color */
.nav-links-container a:visited {
    color: var(--text-primary); /* Same as default color */
}