/* Reset and Base Styles */
* {
    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-color: #f9f9f9;
}

/* Navigation */
.navbar {
    background-color: #2c3e50;
    padding: 1rem 0;
    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: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

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

.nav-link {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s;
}

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

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

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: white;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.hero h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.3rem;
    color: #7f8c8d;
    margin-bottom: 1rem;
}

/* Content Sections */
.content-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.preview-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.preview-card h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.preview-card h3 {
    margin-bottom: 0.5rem;
}

.preview-card h3 a {
    color: #2c3e50;
    text-decoration: none;
    transition: color 0.3s;
}

.preview-card h3 a:hover {
    color: #3498db;
}

.date {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.read-more {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    margin-top: 1rem;
}

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

/* About Preview */
.about-preview {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.about-preview h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Blog and Papers Lists */
.post-list, .paper-list {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.post-item, .paper-item {
    padding: 1.5rem 0;
    border-bottom: 1px solid #ecf0f1;
}

.post-item:last-child, .paper-item:last-child {
    border-bottom: none;
}

.post-item h2, .paper-item h2 {
    margin-bottom: 0.5rem;
}

.post-item h2 a, .paper-item h2 a {
    color: #2c3e50;
    text-decoration: none;
    transition: color 0.3s;
}

.post-item h2 a:hover, .paper-item h2 a:hover {
    color: #3498db;
}

/* Article Content */
.article {
    background: white;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    max-width: 800px;
    margin: 0 auto;
}

.article h1 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 2rem;
}

.article-meta {
    color: #7f8c8d;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #ecf0f1;
}

.article h2 {
    color: #2c3e50;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.article p {
    margin-bottom: 1rem;
}

.article ul {
    margin-bottom: 1rem;
    margin-left: 2rem;
}

.article ul li {
    margin-bottom: 0.5rem;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: #3498db;
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

/* Button */
.button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
    margin-top: 1rem;
}

.button:hover {
    background-color: #2980b9;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
}

footer p {
    margin: 0.5rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .article {
        padding: 1.5rem;
    }
}