body,
h1,
ul,
li,
a,
button {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
    border: none;
    background: none;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #000;
    color: #fff;
    padding: 15px 20px;
}

.container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.logo img {
    height: 30px;
}

nav ul {
    display: flex;
    gap: 20px;
    padding: 0;
    margin: 0;
}

nav ul li {
    display: inline-block;
}

nav ul li a,
nav ul li .logout-button {
    color: #fff;
    font-size: 20px;
    transition: color 0.3s;
    padding: 5px 10px;
    display: inline-block;
    cursor: pointer;
}

nav ul li a:hover,
nav ul li .logout-button:hover {
    color: #aaa;
}

@media (min-width: 768px) and (max-width: 850px) {
    header {
        padding: 12px 15px;
    }

    .logo img {
        height: 24px;
    }

    nav ul {
        gap: 10px;
    }

    nav ul li a,
    nav ul li .logout-button {
        font-size: 15px;
        padding: 5px 8px;
    }
}

@media (max-width: 767px) {
    header {
        padding: 10px 15px;
    }

    .container {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .logo img {
        height: 17px;
    }

    nav {
        width: 100%;
    }

    nav ul {
        flex-direction: column;
        gap: 6px;
        width: 100%;
    }

    nav ul li {
        display: block;
        width: 100%;
    }

    nav ul li a,
    nav ul li .logout-button {
        font-size: 12px;
        padding: 2px 0;
        display: block;
        width: 100%;
        text-align: left;
    }
}