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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-wrapper {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 280px;
    background: #fff;
    padding: 2rem;
    box-shadow: 2px 0 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.profile-photo {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 1.5rem;
    display: block;
    border: 4px solid #3498db;
}

.sidebar h2 {
    text-align: center;
    color: #2c3e50;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.sidebar .tagline {
    text-align: center;
    color: #7f8c8d;
    font-size: 0.95rem;
    margin-bottom: 2rem;
    line-height: 1.4;
}

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

.social-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: #f8f9fa;
    border-radius: 8px;
    text-decoration: none;
    color: #2c3e50;
    transition: all 0.3s;
}

.social-link:hover {
    background: #3498db;
    color: #fff;
    transform: translateX(5px);
}

.social-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.main-content {
    flex: 1;
    min-width: 0;
}

nav {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

nav h1 {
    font-size: 1.5rem;
    color: #2c3e50;
}

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

nav a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover, nav a.active {
    color: #3498db;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

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

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero {
    background: #fff;
    padding: 3rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.07);
    margin-bottom: 2rem;
}

.hero h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    color: #555;
    max-width: 700px;
}

.section {
    background: #fff;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.07);
    margin-bottom: 2rem;
}

.section h3 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 1.5rem;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.5rem;
}

.update, .publication, .blog-post {
    padding: 1.5rem;
    border-left: 4px solid #3498db;
    background: #f8f9fa;
    margin-bottom: 1.5rem;
    border-radius: 4px;
}

.update h4, .publication h4, .blog-post h4 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.date {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.publication-meta {
    color: #555;
    font-style: italic;
    margin-top: 0.5rem;
}

.blog-post p {
    color: #555;
    margin-top: 0.5rem;
}

.read-more {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    margin-top: 0.5rem;
    display: inline-block;
}

.read-more:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .main-wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 1.5rem;
    }

    .profile-photo {
        width: 120px;
        height: 120px;
    }

    nav .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .container {
        padding: 2rem 1rem;
    }

    .hero, .section {
        padding: 2rem 1.5rem;
    }
}