/*반응형 웹 CSS*/
@media (max-width: 768px) {
    header {
        padding: 2rem 0;
    }
    header h1 {
        font-size: 1.5rem;
    }
    .container {
        width: 90%;
        padding: 1rem;
        grid-template-columns: 1fr;
    }
    nav a {
        margin: 0 0.5rem;
    }
    .project-box {
        height: 150px;
    }
}
@media (max-width: 480px) {
    header {
        padding: 1.5rem 0;
    }
    header h1 {
        font-size: 1.2rem;
    }
    nav a {
        display: block;
        margin: 0.5rem 0;
    }
    .project-box {
        height: 100px;
    }
}