How do I hide top navigation links on phone in landscape mode? Media Query?

Hello professionals,

I'm sort of teaching myself responsive web design through w3schools online, using their css file and a sample template, using my phone to test, which has a screen resolution of 360x756 (portrait) and 756x360 (landscape).

What I'm trying to do is hide the top navbar (replace with the hamburger icon) in landscape mode, as the list is too long and slips below the business name on the left.

How do I do so using media queries? I've played around a bit but with no success.

Here's the page:  http://www.daveharrisonwebdesign.com/test.html

And this is what's included in the css:

@media (min-width:601px){.w3-col.m1{width:8.33333%}.w3-col.m2{width:16.66666%}.w3-col.m3,.w3-quarter{width:24.99999%}.w3-col.m4,.w3-third{width:33.33333%}
.w3-col.m5{width:41.66666%}.w3-col.m6,.w3-half{width:49.99999%}.w3-col.m7{width:58.33333%}.w3-col.m8,.w3-twothird{width:66.66666%}
.w3-col.m9,.w3-threequarter{width:74.99999%}.w3-col.m10{width:83.33333%}.w3-col.m11{width:91.66666%}.w3-col.m12{width:99.99999%}}
@media (min-width:993px){.w3-col.l1{width:8.33333%}.w3-col.l2{width:16.66666%}.w3-col.l3{width:24.99999%}.w3-col.l4{width:33.33333%}
.w3-col.l5{width:41.66666%}.w3-col.l6{width:49.99999%}.w3-col.l7{width:58.33333%}.w3-col.l8{width:66.66666%}
.w3-col.l9{width:74.99999%}.w3-col.l10{width:83.33333%}.w3-col.l11{width:91.66666%}.w3-col.l12{width:99.99999%}}
.w3-rest{overflow:hidden}.w3-stretch{margin-left:-16px;margin-right:-16px}
.w3-content,.w3-auto{margin-left:auto;margin-right:auto}.w3-content{max-width:1100px}.w3-auto{max-width:1140px} /* changed to 1100px from 980px */
.w3-cell-row{display:table;width:100%}.w3-cell{display:table-cell}
.w3-cell-top{vertical-align:top}.w3-cell-middle{vertical-align:middle}.w3-cell-bottom{vertical-align:bottom}
.w3-hide{display:none!important}.w3-show-block,.w3-show{display:block!important}.w3-show-inline-block{display:inline-block!important}
@media (max-width:1205px){.w3-auto{max-width:95%}}
@media (max-width:400px){.w3-modal-content{margin:0 10px;width:auto!important}.w3-modal{padding-top:30px}
.w3-dropdown-hover.w3-mobile .w3-dropdown-content,.w3-dropdown-click.w3-mobile .w3-dropdown-content{position:relative}
.w3-hide-small{display:none!important}.w3-mobile{display:block;width:100%!important}.w3-bar-item.w3-mobile,.w3-dropdown-hover.w3-mobile,.w3-dropdown-click.w3-mobile{text-align:center}
.w3-dropdown-hover.w3-mobile,.w3-dropdown-hover.w3-mobile .w3-btn,.w3-dropdown-hover.w3-mobile .w3-button,.w3-dropdown-click.w3-mobile,.w3-dropdown-click.w3-mobile .w3-btn,.w3-dropdown-click.w3-mobile .w3-button{width:100%}}
@media (max-width:768px){.w3-modal-content{width:500px}.w3-modal{padding-top:50px}}
@media (min-width:993px){.w3-modal-content{width:900px}.w3-hide-large{display:none!important}.w3-sidebar.w3-collapse{display:block!important}}
@media (max-width:992px) and (min-width:601px){.w3-hide-medium{display:none!important}}
@media (max-width:992px){.w3-sidebar.w3-collapse{display:none}.w3-main{margin-left:0!important;margin-right:0!important}.w3-auto{max-width:100%}}

...

Thanks for any assistance,

Dave