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

:root {
    --sage-green: #B4B8AB;
    --dark-blue: #153243;
    --medium-blue: #284B63;
    --off-white: #EEF0EB;
}

body {
    font-family: 'Georgia', serif;
    line-height: 1.6;
    color: var(--dark-blue);
    background-color: var(--off-white);
}

/* Header and Navigation */
header {
    background-color: var(--off-white);
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-blue);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    background-color: var(--sage-green);
    color: var(--dark-blue);
}

/* Social Icons */
.social-icons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.social-icons a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-icons a:hover {
    color: #0077b5;  /* LinkedIn blue color on hover */
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.page {
    display: none;
    animation: fadeIn 0.5s ease-in;
}

.page.active {
    display: block;
}

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

/* Homepage Styles */
.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    color: var(--medium-blue);
    margin-bottom: 1rem;
    font-weight: 300;
}

.hero .subtitle {
    font-size: 1.5rem;
    color: var(--sage-green);
    margin-bottom: 2rem;
}

.profile-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--sage-green);
    margin: 0 auto 2rem;
    display: block;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
}

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

.intro {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 3rem;
}

.intro h2 {
    color: var(--medium-blue);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.intro p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    text-align: justify;
}

/* General Content Styles */
.content-section {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.content-section h2 {
    color: var(--medium-blue);
    margin-bottom: 1.5rem;
    font-size: 2rem;
    border-bottom: 2px solid var(--sage-green);
    padding-bottom: 0.5rem;
}

.content-section h3 {
    color: var(--dark-blue);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.content-section p {
    margin-bottom: 1rem;
    text-align: justify;
}

/* Publications */
.publication-item {
    border-left: 4px solid var(--sage-green);
    padding-left: 1rem;
    margin-bottom: 1.5rem;
}

.publication-item h4 {
    color: var(--medium-blue);
    margin-bottom: 0.5rem;
}

.publication-item .authors {
    font-style: italic;
    color: var(--dark-blue);
    margin-bottom: 0.3rem;
}

.publication-item .journal {
    color: var(--sage-green);
    font-weight: bold;
}

/* Materials */
.material-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.material-card {
    background-color: var(--off-white);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--sage-green);
    transition: transform 0.3s ease;
}

.material-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.material-card h4 {
    color: var(--medium-blue);
    margin-bottom: 0.5rem;
}

/* Miscellaneous */
.misc-item {
    background-color: var(--off-white);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid var(--medium-blue);
}

/* Contact */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.contact-card {
    background-color: var(--off-white);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.contact-card h4 {
    color: var(--medium-blue);
    margin-bottom: 0.5rem;
}

/* Blog Styles */
.blog-list {
    list-style: none;
    padding: 0;
}

.blog-entry {
    margin-bottom: 2rem;
}

.blog-entry h3 {
    margin-bottom: 0.5rem;
}

.blog-entry a {
    color: #333;
    text-decoration: none;
}

.blog-entry a:hover {
    text-decoration: underline;
}

.post-date {
    color: #666;
    font-size: 0.9rem;
    margin: 0.25rem 0;
}

.post-description {
    margin-top: 0.5rem;
}

/* Talks */
.talks-list {
    list-style: none;
    padding: 0;
}

.talk-entry {
    margin-bottom: 1.5rem;
}

.talk-entry h3 {
    margin-bottom: 0.5rem;
}

.talk-links {
    font-size: 0.9rem;
}

.talk-links a {
    color: #0066cc;
    text-decoration: none;
}

.talk-links a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        padding: 0.3rem 0.8rem;
        font-size: 0.9rem;
    }

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

    .hero .subtitle {
        font-size: 1.2rem;
    }

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

    main {
        padding: 2rem 1rem;
    }
}