:root {
    --primary-color: #2d1810;
    --secondary-color: #c17f59;
    --accent-color: #d4956b;
    --text-color: #e6e6e6;
    --background-color: rgba(18, 18, 18, 0.75);
    --card-background: rgba(26, 26, 26, 0.85);
    --nav-background: rgba(18, 18, 18, 0.95);
}

body {
    font-family: 'CMU Concrete', 'CMU Serif', serif;
    line-height: 1.6;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    background-color: #121212;
    background-image: url('M31_v1.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(18, 18, 18, 0.6); /* Made more transparent for brighter background */
    z-index: -1;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--nav-background);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

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

.nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 1rem;
    padding: 0.5rem;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    position: relative;
    color: var(--text-color);
    padding: 8rem 2rem 4rem;
    text-align: center;
}

.hero-content {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.title {
    color: var(--secondary-color);
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

/* Social Links */
.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Profile Links - for aligning buttons horizontally */
.profile-links {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem; /* Add some spacing between items */
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    background-color: rgba(193, 127, 89, 0.2);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.social-link img {
    height: 24px;
    width: auto;
    object-fit: contain;
    filter: invert(1);
}

.social-icon {
    height: 24px;
    width: auto;
    object-fit: contain;
    filter: invert(1);
}

.spie-logo {
    height: 24px;
    width: auto;
    object-fit: contain;
    filter: none;
}

.social-link:hover {
    background-color: rgba(193, 127, 89, 0.3);
    transform: translateY(-2px);
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--background-color);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    margin-top: -2rem;
    position: relative;
    z-index: 1;
}

section {
    margin-bottom: 4rem;
}

h2 {
    color: var(--accent-color);
    font-size: 2rem;
    margin-bottom: 2rem;
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--secondary-color);
    margin-top: 0.5rem;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    align-items: start;
}

.profile-img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* Research and Projects Sections */
.research-grid, .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.research-card, .project-card {
    background-color: var(--card-background);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
    backdrop-filter: blur(5px);
}

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

.project-role {
    color: var(--secondary-color);
    font-weight: bold;
    margin: 0.5rem 0;
}

/* Publications Section */
.publications-section {
    padding: 2rem;
    background-color: var(--background-color);
    color: var(--text-color);
}

.publications-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.publications-section ul {
    list-style: none;
    padding: 0;
}

.publications-section li {
    margin-bottom: 0.5rem;
}

.publications-section a {
    color: var(--accent-color);
    text-decoration: none;
}

.publications-section a:hover {
    text-decoration: underline;
}

/* Contact Section */
.contact-section {
    text-align: center;
}

.contact-content {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    display: inline-block;
    backdrop-filter: blur(5px);
}

.email-link {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.email-link:hover {
    color: var(--secondary-color);
}

/* CV Link */
.cv-link {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--text-color);
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
    margin-top: 1rem;
}

.cv-link:hover {
    background-color: var(--secondary-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--nav-background);
    color: var(--text-color);
    margin-top: 4rem;
    backdrop-filter: blur(10px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        display: none;
    }

    .nav-content {
        flex-direction: column;
        text-align: center;
    }

    .nav-links {
        margin-top: 1rem;
    }

    .nav-links a {
        display: block;
        margin: 0.5rem 0;
    }

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

    .hero {
        padding: 6rem 1rem 3rem;
    }

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

    main {
        padding: 1rem;
        margin-top: -1rem;
    }

    .social-links {
        flex-direction: column;
        gap: 1rem;
    }
}