body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: #1a1a1a;
    color: #f0f0f0;
}

header nav {
    display: flex;
    justify-content: space-around;
    background-color: #333;
    padding: 1rem;
}

nav a {
    color: #f0f0f0;
    text-decoration: none;
    padding: 0.5rem;
}

.dropdown {
    position: relative;
}

.dropbtn {
    background: none;
    border: none;
    color: #f0f0f0;
    cursor: pointer;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #444;
    min-width: 160px;
    z-index: 1;
}

.dropdown-content a {
    color: #f0f0f0;
    padding: 0.5rem;
    text-decoration: none;
    display: block;
}

.dropdown:hover .dropdown-content {
    display: block;
}

main {
    padding: 2rem;
    text-align: center;
}

.pdf-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    list-style-type: none;
    padding: 0;
    gap: 1rem;
    margin-top: 1.5rem;
}

.pdf-list li {
    width: 100%;
    max-width: 300px;
}

.pdf-list a {
    display: block;
    padding: 1rem;
    background-color: #4CAF50;
    color: #fff;
    text-decoration: none;
    text-align: center;
    border-radius: 5px;
    transition: background-color 0.3s;
    font-size: 1rem;
}

.pdf-list a:hover {
    background-color: #45a049;
}

.pdf-container {
    margin-top: 2rem;
    border: 1px solid #444;
    border-radius: 5px;
    overflow: hidden;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: #333;
}


.hero-image {
    width: 128px;
    height: 128px;
    border-radius: 50%; 
    object-fit: cover; 
    margin: 20px 0;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.hero-image:hover {
    transform: scale(1.05);
}