レスポンシブヘッダーメニュー

<!-- header -->
<header class="header" id="head_wrap">
<div class="inner">
<div id="mobile-head">
<h1 class="logo">
ロゴ
</h1>
<div id="nav-toggle">
<div>
<span></span>
<span></span>
<span></span>
</div>
</div>
</div>
<nav id="global-nav">
<ul>
<li><a href="#menu1">MENU1</a></li>
<li><a href="#menu2">MENU2</a></li>
<li><a href="#menu3">MENU3</a></li>
<li><a href="#menu4">MENU4</a></li>
<li><a href="#menu5">MENU5</a></li>
</ul>
</nav>
</div>
</header>
<!-- /header -->

// 追従ナビ・スマホでハンバーガーメニューになる 
(function($) { 
$(function() { var $header = $('#head_wrap'); 
// Nav Fixed 
$(window).scroll(function() {
 if ($(window).scrollTop() > 350) {
 $header.addClass('fixed'); }
 else {
 $header.removeClass('fixed');
 } });
 // Nav Toggle Button
 $('#nav-toggle, #global-nav ul li a').click(function(){
 $header.toggleClass('open');
 });
 });
 })(jQuery);
 // ゆっくりスクロールする
 $(function(){
 $('a[href^="#"]').click(function() {
 var adjust = 0;
 var speed = 1200;
 var href= $(this).attr("href");
 var target = $(href == "#" || href == "" ? 'html' : href);
 var position = target.offset().top + adjust;
 $('body,html').animate({scrollTop:position}, speed, 'swing');
 return false; }); });

#head_wrap {
    top: -100px;
    position: relative;
    width: 100%;
    margin: 100px auto 0;
    line-height: 1;
    z-index: 999;
    height: 0px;
    text-decoration: none;
}
#head_wrap a {
    text-decoration: none;
}
#head_wrap .inner {
    width: 100%;
    margin: 0 auto;
    position: relative;
}
#head_wrap .inner:after {
    content: "";
    clear: both;
    display: block;
}
#head_wrap .logo {
    float: left;
    font-size: 36px;
}
#global-nav {
    position: absolute;
    right: 0;
    top: 0;
}
#global-nav ul {
    list-style: none;
    font-size: 14px;
    margin-right: 10px;
    display: inline-flex;
}
#global-nav ul li {
    padding: 20px 10px;
}
#global-nav ul li:last-child {
    border-right: none;
}
#global-nav ul li a {
    padding: 0 5px;
    padding: 2px;
    transition: all .6s ease 0s;
    box-sizing: border-box;
    font-weight: bold;
}
#head_wrap.fixed {
    margin-top: 0;
    top: 0;
    position: fixed;
    height: 100px;
    transition: top 0.65s ease-in;
    -webkit-transition: top 0.65s ease-in;
    -moz-transition: top 0.65s ease-in;
    z-index: 9999;
}
#head_wrap.fixed .logo {
    font-size: 36px;
    color: #333;
}
#head_wrap.fixed #global-nav ul li a {
    color: #333;
    padding: 0 20px;
}
#nav-toggle {
    display: none;
    position: absolute;
    right: 12px;
    top: 14px;
    width: 26px;
    height: 26px;
    cursor: pointer;
    z-index: 101;
}
#nav-toggle div {
    position: relative;
}
.fixed {
    padding-top: 0;
    background: transparent;
}










@media screen and (max-width: 780px) {


#mobile-head {
    background: rgba(255, 255, 255, 0.9);
    width: 100%;
    height: 56px;
    z-index: 999;
    position: relative;
}
#head_wrap.fixed .logo, #head_wrap .logo {
    position: absolute;
    left: 13px;
    top: 13px;
    color: #333;
    font-size: 26px;
}
#global-nav {
    position: absolute;
    top: -500px;
    background: rgba(255, 255, 255, 0.9);
    width: 100%;
    text-align: center;
    -webkit-transition: .5s ease-in-out;
    -moz-transition: .5s ease-in-out;
    transition: .5s ease-in-out;
}




#global-nav ul {
list-style: none;
    font-size: 14px;
    margin-right: 0px;
    display:block;
}
#global-nav ul li {
    float: none;
    position: static;
}
#head_wrap #global-nav ul li a, #head_wrap.fixed #global-nav ul li a {
    width: 100%;
    display: block;
    padding: 5px 0;
}
#nav-toggle {
    display: block;
}
#nav-toggle span {
    display: block;
    position: absolute;
    height: 2px;
    width: 100%;
    background: #666;
    left: 0;
    -webkit-transition: .35s ease-in-out;
    -moz-transition: .35s ease-in-out;
    transition: .35s ease-in-out;
}
#nav-toggle span:nth-child(1) {
    top: 0;
}
#nav-toggle span:nth-child(2) {
    top: 8px;
}
#nav-toggle span:nth-child(3) {
    top: 16px;
}


#nav-toggle span:nth-child(3)::after {
  content:"Menu";/*3つ目の要素のafterにMenu表示を指定*/
  position: absolute;
  top:7px;
  color: #111;
  font-size: 0.6rem;
  text-transform: uppercase;
}




.open #nav-toggle span:nth-child(1) {
    top: 11px;
    -webkit-transform: rotate(315deg);
    -moz-transform: rotate(315deg);
    transform: rotate(315deg);
}
.open #nav-toggle span:nth-child(2) {
    width: 0;
    left: 50%;
}
.open #nav-toggle span:nth-child(3) {
    top: 11px;
    -webkit-transform: rotate(-315deg);
    -moz-transform: rotate(-315deg);
    transform: rotate(-315deg);
}


.open #nav-toggle span:nth-child(3)::after {
 content:"Close";/*3つ目の要素のafterにClose表示を指定*/
    transform: translateY(0) rotate(-45deg);
  position: absolute;
  top:10px;
left:11px;
  color: #111;
  font-size: 0.6rem;


}




.open #global-nav {
    -moz-transform: translateY(556px);
    -webkit-transform: translateY(556px);
    transform: translateY(556px);
}
}

レスポンシブ ヘッダーメニュー