* {
    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: #f5f5f5;
}

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

header {
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.nav-menu {
    background-color: #2c3e50;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.nav-menu ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-menu a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-menu a:hover {
    background-color: #34495e;
}

.nav-menu a.active {
    background-color: #3498db;
}

h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

h2 {
    color: #34495e;
    margin-bottom: 1rem;
}

h3 {
    color: #34495e;
    margin: 1.5rem 0 1rem;
}

.content {
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.app-card {
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    background-color: #fff;
    transition: transform 0.2s;
}

.app-card:hover {
    transform: translateY(-2px);
}

.app-card img {
    max-width: 128px;
    height: auto;
    border-radius: 12px;
    margin-bottom: 1rem;
}

.app-meta {
    color: #666;
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

.resources ul {
    list-style: none;
    margin: 1rem 0;
}

.resources li {
    padding: 0.5rem 0;
}

.resources a {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
}

.resources a:hover {
    text-decoration: underline;
}

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

.about-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

footer {
    margin-top: 2rem;
    text-align: center;
    color: #7f8c8d;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav-menu ul {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }
    
    .project-grid {
        grid-template-columns: 1fr;
    }
}