.how-to-use-nav {
    background-color: #f8f9fa;
    padding: 10px 0;
    margin-bottom: 20px;
    border-bottom: 1px solid #dee2e6;
}

.how-to-use-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.how-to-use-nav li {
    margin: 0 10px;
}

.how-to-use-nav a {
    text-decoration: none;
    color: #4CAF50;;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.how-to-use-nav a:hover {
    background-color: #e9ecef;
    text-decoration: none;
}

.how-to-use-nav a.active {
    background-color: #4CAF50;;
    color: white;
}

.how-to-use-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    line-height: 1.6;
    color: #333;
}

.how-to-use-container h1 {
    font-size: 24px;
    margin-bottom: 20px;
    text-align: center;
}

.how-to-use-container h2 {
    font-size: 18px;
    margin-top: 30px;
    margin-bottom: 15px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 5px;
}

.how-to-use-container p {
    margin-bottom: 15px;
}

.how-to-use-container ol {
    margin-bottom: 15px;
    padding-left: 20px;
}

.how-to-use-container li {
    margin-bottom: 5px;
}

.how-to-use-image {
    max-width: 100%;
    height: auto;
    margin-bottom: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hamburger-menu {
    display: none;
    text-align: right;
    padding: 0 20px;
}

.hamburger-icon {
    width: 30px;
    height: auto;
    cursor: pointer;
}

@media (max-width: 768px) {
    .how-to-use-container {
        padding: 15px;
    }

    .hamburger-menu {
        display: block;
    }

    .how-to-use-nav ul {
        display: none;
        /* Hide by default on mobile */
        flex-direction: column;
        align-items: center;
    }

    .how-to-use-nav li {
        margin: 5px 0;
        width: 100%;
        text-align: center;
    }

    .how-to-use-nav a {
        display: block;
        width: 100%;
        padding: 10px;
        box-sizing: border-box;
    }
}