header {
    background-color: var(--primary-back-main);
    padding: 10px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--primary-back-main-txt);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

    header div {
        display: flex;
        align-items: center;
    }

    header a {
        color: var(--primary-back-main-txt);
        text-decoration: none;
        font-size: 1.2em;
        font-weight: bold;
        margin-right: 20px;
    }

    header button {
        background: none;
        border: none;
        color: white;
        font-size: 1.5em;
        cursor: pointer;
        margin-left: auto;
    }

        header button span {
            display: block;
            width: 30px;
            height: 3px;
            background: white;
            margin: 5px 0;
        }

    header div ul {
        list-style: none;
        display: flex;
        gap: 30px;
        padding: 0;
        margin: 0;
    }

        header div ul li {
            display: inline;
            width: 50px;
        }

            header div ul li a {
                color: white;
                padding: 8px 15px;
                border-radius: 5px;
                transition: background 0.3s ease;
                width: 100%;
                display: block;
                text-align: center;
            }

                header div ul li a:hover {
                    background: rgba(255, 255, 255, 0.2);
                }

body {
    padding-top: 30px; /* Щоб контент не заходив під хедер */
    height: calc(100vh - 110px);
}