body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background: #35424a;
    color: #ffffff;
    padding: 20px 0;
    text-align: center;
}

h1 {
    margin: 0;
    font-size: 2.5em;
}

nav {
    margin: 20px 0;
}

nav a {
    color: #ffffff;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
}

#portfolio {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

@media screen and (max-width: 768px) {
    #portfolio {
        grid-template-columns: 1fr;
    }
}

.portfolio-item {
    background: #ffffff;
    border: 1px solid #dddddd;
    margin: 10px;
    padding: 15px;
    flex: 1 1 calc(30% - 20px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.portfolio-item:hover {
    transform: scale(1.05);
}

.portfolio-item video {
    width: 80%;
    max-width: 600px;
    display: block;
    margin: 0 auto;
    border: 2px solid #ccc;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

section {
    border: 2px solid #ccc;
    padding: 20px;
    margin: 20px auto;
    border-radius: 8px;
}

footer {
    text-align: center;
    padding: 20px 0;
    background: #35424a;
    color: #ffffff;
    position: relative;
    bottom: 0;
    width: 100%;
}