body {
    
    background-color: #f4f4f9; 
    
    font-family: 'Malgun Gothic', '맑은 고딕', sans-serif;
    
    font-size: 16px; 
    
    color: #333;
    
    margin: 0;
    
    text-align: center;
}


main {
    max-width: 900px;
    margin: 20px auto; 
    background-color: #fff;
    padding: 20px; 
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}


header {
    background-color: #007bff;
    color: white;
    padding: 10px 0;
}

nav a {
    
    color: white; 
    text-decoration: none;
    margin: 0 15px;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #0056b3;
}


h1 {
    
    color: #007bff; 
    text-align: center; 
    margin-top: 0;
    padding-bottom: 10px;
    border-bottom: 2px solid #007bff;
}


.content-container {
    display: flex;
    flex-direction: column;
    align-items: center; 
    justify-content: center; 
    min-height: 450px; 
    padding: 20px;
    gap: 20px;
}


.media-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}


img {
    border: 3px solid #ccc;
    border-radius: 5px;
    max-width: 100%;
    height: auto;
}


audio, video {
    outline: none;
    border-radius: 5px;
}


ul, ol {
    text-align: left; 
    padding-left: 40px;
}


footer {
    
    background-color: #333; 
    
    color: white;
    padding: 10px 0;
    text-align: center;
    margin-top: 20px;
}


hr {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0), #ccc, rgba(0, 0, 0, 0));
}