body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}

header {
    background-color: #fff;
    border-bottom: 1px solid #ddd;
    padding: 10px 20px;
}

nav a {
    margin-right: 20px;
    color: #007bff;
    text-decoration: none;
}

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

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

article h1 {
    color: #28a745;
    font-size: 24px;
}

.video-container {
    position: relative;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    margin-top: 20px;
    margin-bottom: 20px;
}

.video-container img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.play-button::before {
    content: '';
    display: block;
    width: 0;
    height: 0;
    border-left: 20px solid white;
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
}

.comments {
    margin-top: 40px;
}

.comments h2 {
    font-size: 20px;
    margin-bottom: 20px;
}

.comment {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
}

.comment .avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 10px;
}

.comment-content {
    background-color: #f1f1f1;
    padding: 10px 15px;
    border-radius: 8px;
    flex-grow: 1;
}

.comment-form {
    display: flex;
    flex-direction: column;
}

.comment-form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 8px;
    resize: none;
}

.comment-form button {
    align-self: flex-end;
    padding: 10px 20px;
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.comment-form button:hover {
    background-color: #218838;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #fff;
    border-top: 1px solid #ddd;
}