/*
header
*/
.header{
    color: #fff;
    padding: clamp(8px, 1vh, 12px) clamp(10px, 2vw, 28px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    width: 100%;
    box-sizing: border-box;
    background-color: transparent;
    backdrop-filter: none;
    overflow: hidden;
    flex-wrap: nowrap !important; /* 折り返さない */  
}
.header-logo{
    display: block;
    height: clamp(32px, 4vw, 50px);
    width: auto;
}
.header > .logo{
    flex: 0 0 clamp(72px, 10vw, 140px);
    width: clamp(72px, 10vw, 140px);
    min-width: clamp(72px, 10vw, 140px);
}
.header > .logo > a > img{
    display: block;
    width: clamp(56px, 5vw, 80px);
    height: auto;
}
.headr > .img{
    display: block;
    width: 150px;
    height: auto;
}
.header-nav{
    margin-left: clamp(8px, 2vw, 24px); /* ロゴとの間隔も割合で制御 */
    flex: 1 1 auto;              /* ナビゲーションエリアを柔軟に広げる */
    min-width: 0;
    display: flex;
    justify-content: flex-end;
}
.nav-list {
    display: flex;
    align-items: center;
    flex-wrap: nowrap !important; /* リスト内も絶対に1行 */
    gap: clamp(2px, 0.45vw, 8px); /* 項目間の隙間を画面幅に応じて制御 */
    list-style: none;
    margin: 0;
    padding: 0;
}
.nav-item{
    display: inline-flex;
    align-items: center;
    position: relative;
    white-space: nowrap;    /* テキスト自体が途中で改行されるのを防ぐ */
}
.nav-item + .nav-item::before{
    content: "";
    width: 1px;
    height: clamp(12px, 1.5vw, 18px);
    background: rgba(255, 255, 255, 0.45);
    margin: 0 clamp(4px, 0.6vw, 10px);
}
.nav-item a{
    color: #fff;
    position: relative;
    display: inline-block;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding: clamp(5px, 0.7vw, 8px) clamp(8px, 1vw, 16px);
    border: 0;
    transition: color 0.2s ease, transform 0.25s ease;
    padding: 8px 16px;           
    border-radius: 4px;         
    transition: all 0.3s ease;  
}
.nav-item a::after{
    content: "";
    position: absolute;
    left: clamp(8px, 0.8vw, 12px);
    right: clamp(8px, 0.8vw, 12px);
    bottom: 3px;
    height: 2px;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(154, 232, 255, 0.95), rgba(255, 255, 255, 0.95));
    transform: scaleX(0.05);
    transform-origin: left center;
    opacity: 0;
    transition: transform 0.32s cubic-bezier(0.17, 0.84, 0.44, 1), opacity 0.2s ease;
}
.nav-item a:hover{
    opacity: 1;
    transform: translateY(-1px);
    color: #0fb3ea;
    background-color: rgba(154, 232, 255, 0.15); 
    text-shadow: 0 0 8px rgba(154, 232, 255, 0.5); 
    transform: translateY(-2px);
}
.nav-item a:hover::after,
.nav-item a:focus-visible::after{
    opacity: 1;
    transform: scaleX(1);
    
}
.nav-item a:focus-visible{
    outline: none;
    color: #e9fbff;
}
@media (max-width: 820px) {
    .header{
        padding: 10px 14px;
    }
    .header > .logo > img{
        width: 80px;
    }
    .nav-list{
        gap: 0;
    }
    .nav-item a{
        font-size: 14px;
        padding: 6px 9px;
    }
    .nav-item a::after{
        left: 9px;
        right: 9px;
        bottom: 2px;
    }
    .nav-item + .nav-item::before{
        height: 14px;
        margin: 0 6px;
    }
}
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: nowrap !important; 
    padding: 1vh 2vw;    
    width: 100%;
}

.header-nav {
    margin-left: 2vw;           
    flex: 1;                    
    display: flex;
    justify-content: flex-end;
}

.nav-list {
    display: flex;
    align-items: center;
    flex-wrap: nowrap !important; 
    gap: 0.5vw;                  
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    white-space: nowrap;       
}

.nav-item a {
    font-size: clamp(10px, 1.2vw, 16px); 
    padding: 0.8vh 1vw;                
}

.nav-item + .nav-item::before {
    content: "";
    width: 1px;
    height: clamp(12px, 1.5vw, 18px);
    background: rgba(255, 255, 255, 0.45);
    margin: 0 clamp(4px, 0.4vw, 8px);
}

@media (max-width: 820px) {
    .header{
        padding: 8px clamp(10px, 2vw, 14px);
    }
    .header > .logo{
        flex-basis: clamp(64px, 16vw, 110px);
        width: clamp(64px, 16vw, 110px);
        min-width: clamp(64px, 16vw, 110px);
    }
    .header > .logo > img{
        width: 100%;
    }
    .nav-list{
        gap: clamp(1px, 0.25vw, 4px);
    }
    .nav-item a{
        font-size: clamp(10px, 2.8vw, 14px);
        padding: clamp(4px, 0.9vw, 6px) clamp(6px, 1.3vw, 9px);
    }
    .nav-item a::after{
        left: clamp(6px, 1.2vw, 9px);
        right: clamp(6px, 1.2vw, 9px);
        bottom: 2px;
    }
    .nav-item + .nav-item::before{
        height: clamp(10px, 2.2vw, 14px);
        margin: 0 clamp(3px, 1vw, 6px);
    }
}
@media (max-width: 474px) {
    .logo{
        display: none;
    }
}