* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* COLORS */
    --main-header-primary-color: #CCC;
    --main-header-secondary-color: #151515;
    --main-header-tertiary-color: #252525;
    --main-header-quaternary-color: #aaa;
    --main-header-shadow-color: rgba(0, 0, 0, 0.9);

    /* FONT */
    --main-header-font-family: Calibri, sans-serif;

    /* MAIN HEADER */
    --main-header-menu-width: 450px;
    --main-header-menu-button-height: 40px;
    --main-header-menu-button-width: 100px;

    /* TRASITION */
    --main-header-transition: all 0.35s ease;
}

/* MAIN HEADER */
.main-header {
    position: fixed; z-index:2;
    width: 100%;
    display: flex;
    justify-content: center;
    background: var(--main-header-primary-color);
    height: 70px;
    font-family: var(--main-header-font-family); 
    box-shadow: 0 0 10px var(--main-header-shadow-color);   
    text-transform: uppercase;
    transition: var(--main-header-transition);
}
    .main-header .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        max-width: 1280px;
    }
        .main-header-logo {
            margin: 20px;
            min-width: 120px;
        }
        .main-header-menu {
            display: none;
            font-weight: 100;
            width: var(--main-header-menu-width);
            margin: 250px;
        }
            .main-header-menu ul {
                display: flex;
                justify-content: space-between;
                height: 100%;
                width: 100%;    
                list-style-type: none;
            }
                .main-header-menu a {
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    background: var(--main-header-secondary-color);
                    color: var(--main-header-quaternary-color);
                    border: 1px solid var(--main-header-tertiary-color);
                    width: var(--main-header-menu-button-width);
                    height: var(--main-header-menu-button-height);
                    border-radius: 5px;
                    margin: 5px;
                    transition: var(--main-header-transition);
                    text-decoration: none;
                }
                    .main-header-menu a:hover {
                        background: var(--main-header-tertiary-color);
                        box-shadow: 0px 4px 10px var(--main-header-shadow-color);
                    }

/* SIDE MENU */
.side-menu {
    display: flex;
    width: 1000px;
    position: absolute;
    left: -1000px;
    z-index: 10;
    height: 1000px;
    transition: var(--main-header-transition);
}
    .side-menu-content {
        height: 100%;
        width: 276px;
        background: #333;
    }
        .side-menu ul {
            display: flex;
            flex-direction: column;
            height: 100%;
            top: 70px;
            background: var(--main-header-secondary-color);
            overflow: hidden;
            transition: var(--main-header-transition);
        }
            .side-menu a {
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    background: var(--main-header-secondary-color);
                    color: var(--main-header-quaternary-color);
                    border-bottom: 1px solid var(--main-header-tertiary-color);
                    width: 100%;
                    height: calc(var(--main-header-menu-button-height)*2);
                    transition: var(--main-header-transition);
                    text-decoration: none;
                    text-transform: uppercase;
                    font-family: var(--main-header-font-family);
                }
                    .side-menu a:hover {
                        background: var(--main-header-tertiary-color);
                    }
    .side-menu-close-div {
        height: 100%;
        width: 724px;
        background: rgba(0, 0, 0, 0);
        transition: var(--main-header-transition);
    }

/* SIDE BUTTON */
.main-header-side-menu-button {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: var(--main-header-menu-button-height);
    min-width: Var(--main-header-menu-button-height);
    margin: 20px;
    background: var(--main-header-secondary-color);
    border: 1px solid var(--main-header-tertiary-color);
    border-radius: 5px;
    cursor: pointer;
    transition: var(--main-header-transition);
}
    .main-header-side-menu-button:hover {
        background: var(--main-header-tertiary-color);
        box-shadow: 0px 4px 10px var(--main-header-shadow-color);
    }
    .main-header-side-menu-button .stripes {
        background: var(--main-header-quaternary-color); 
        height: 2px;
        min-width: 25px;
        margin: 2px 0;
    }

/* MEDIA QUERIES MAIN HEADER */
@media (min-width: 768px) {
    .main-header-menu {
        display: flex;
    }
    .side-menu {
        display: none;
    }
    .main-header-side-menu-button {
        display: none;
    }
}