#menu ul {
    margin: 0;
    padding: 0;
}

#menu .main-menu {
    display: none;
   
}

#tm:checked + .main-menu {
    display: block;
}

#menu input[type="checkbox"],
#menu ul span.drop-icon {
    display: none;
}

#menu li,
#toggle-menu,
#menu .sub-menu {
    border-style: solid;
    border-color: rgba(0, 0, 0, .05);
}

#menu li,
#toggle-menu {
    border-width: 0 0 1px;
}

#menu .sub-menu {
    background-color: rgba(20,114,168,255);
    border-width: 1px 1px 0;
    margin: 0 1em;
}

    #menu .sub-menu li:last-child {
        border-width: 0;
    }

#menu li,
#toggle-menu,
#menu a {
    position: relative;
    display: block;
    color: white;
    text-shadow: 1px 1px 0 rgba(0, 0, 0, .125);
}

#menu,
#toggle-menu {
    background-color: #09c;
}

    #toggle-menu,
    #menu a {
        padding: 1em 1.5em;
    }

    #menu a {
        transition: all .125s ease-in-out;
        -webkit-transition: all .125s ease-in-out;
    }

        #menu a:hover {
            background-color: rgb(0 224 255);
        }

    #menu .sub-menu {
        display: none;
    }

    #menu input[type="checkbox"]:checked + .sub-menu {
        display: block;
    }

    #menu .sub-menu a:hover {
        color: #444;
    }

    #toggle-menu .drop-icon,
    #menu li label.drop-icon {
        position: absolute;
        right: 1.5em;
        top: 1.25em;
    }

    #menu label.drop-icon, #toggle-menu span.drop-icon {
        border-radius: 50%;
        width: 1em;
        height: 1em;
        text-align: center;
        background-color: rgba(0, 0, 0, .125);
        text-shadow: 0 0 0 transparent;
        color: rgba(255, 255, 255, .75);
    }

    #menu .drop-icon {
        line-height: 1;
    }

@media only screen and (max-width: 64em) and (min-width: 52.01em) {
    #menu li {
        width: 33.333%;
    }

    #menu .sub-menu li {
        width: auto;
    }
}

@media only screen and (min-width: 52em) {
    #menu .main-menu {
        display: block;
    }

    #toggle-menu,
    #menu label.drop-icon {
        display: none;
    }

    #menu ul span.drop-icon {
        display: inline-block;
    }

    #menu li {
        float: left;
        border-width: 0 1px 0 0;
    }

    #menu .sub-menu li {
        float: none;
    }

    #menu .sub-menu {
        border-width: 0;
        margin: 0;
        position: absolute;
        top: 100%;
        left: 0;
        width: 12em;
        z-index: 3000;
    }

    #menu .sub-menu,
    #menu input[type="checkbox"]:checked + .sub-menu {
        display: none;
    }

        #menu .sub-menu li {
            border-width: 0 0 1px;
        }

        #menu .sub-menu .sub-menu {
            top: 0;
            left: 100%;
        }

    #menu li:hover > input[type="checkbox"] + .sub-menu {
        display: block;
    }
}