*,
:after,
:before {
    box-sizing: border-box;
}

a:link {
    text-decoration: none;
}

a:visited {
    text-decoration: none;
}

a:hover {
    text-decoration: none;
}

a:active {
    text-decoration: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #24292e;
}

header {
    background-color: #24292e;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

nav {
    background-color: #f6f8fa;
    padding: 1rem 0;
    border-bottom: 1px solid #e1e4e8;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

nav a {
    color: #24292e;
    text-decoration: none;
    font-weight: 500;
}

nav a:hover {
    color: #0366d6;
}

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.project-card {
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 1rem;
    background-color: white;
}

.project-card h3 {
    margin-top: 0;
    color: #0366d6;
}

footer {
    background-color: #f6f8fa;
    border-top: 1px solid #e1e4e8;
    padding: 2rem 0;
    text-align: center;
    margin-top: 2rem;
}

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

.social-links a {
    margin: 0 0.5rem;
    color: #24292e;
    text-decoration: none;
}

.social-links a:hover {
    color: #0366d6;
}