/* =========================
   Main Navigation
========================= */

.main-nav{
    display:flex;
    align-items:center;
    justify-content:space-between;

    max-width:1400px;
    margin:0 auto;

    padding:0 40px;
    height:90px;
}
/* =========================
   Top Navigation
========================= */
.top-nav{
    display:flex;
    align-items:center;
    gap:0;
    height:100%;
}

/* =========================
   Menu Button
========================= */

.menu-btn{
    position:relative;
    display:flex;
    align-items:center;
    justify-content:center;

    padding:0 28px;
    height:90px;

    text-decoration:none;
    color:#333;
    background:none;
    border:none;

    font-size:16px;
    font-weight:500;

    cursor:pointer;
    transition:.3s;

    white-space:nowrap;
}
.menu-btn:hover{
    background:#fff;
    color:#0077ff;
}

.menu-btn.active{
    background:#fff;
    color:#0077ff;
}

/* HEADER */

header{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    background:white;
    z-index:999;
    box-shadow:0 2px 10px rgba(0,0,0,0.1);
    transition:.3s;
}





.logo{
opacity:0;
transform:translateY(-10px);
animation:logoFade .8s ease forwards;
transition:.3s;
}

.logo img{
height:80px; /* お好み */
width:auto;
display:block;
}

.logo:hover{
transform:scale(1.05);
}

header.shrink .logo{
transform:scale(.9);
}







/* sub nav */

.sub-nav{
display:flex;
justify-content:center;
gap:50px;
background:#f4f4f4;
overflow:hidden;
max-height:0;
opacity:0;
transition:.35s;
}

.sub-nav.show{
padding:20px;
max-height:200px;
opacity:1;
}

.sub-nav.hide{
max-height:0;
opacity:0;
padding:0;
}

.sub-nav a{
text-decoration:none;
color:#333;
text-align:center;
font-size:14px;
opacity:0;
transform:translateY(10px);
animation:submenuFade .4s ease forwards;
position:relative;
}

.sub-nav a::after{
content:"";
position:absolute;
bottom:-4px;
left:0;
width:0;
height:2px;
background:#0077ff;
transition:.3s;
}

.sub-nav a:hover::after{
width:100%;
}

.icon{
display:block;
font-size:24px;
margin-bottom:5px;
}

@keyframes submenuFade{
0%{opacity:0;transform:translateY(15px);}
100%{opacity:1;transform:translateY(0);}
}

@keyframes logoFade{
0%{opacity:0;transform:translateY(-10px);}
100%{opacity:1;transform:translateY(0);}
}