/* =========================================================
ヘッダー・フッター
========================================================= */

header,
footer{
    width:100%;
    background:var(--header-bg);
    color:var(--header-text);
}

header{
    display:flex;
    align-items:center;
    justify-content:space-between;
    flex-wrap:wrap;
    padding:12px 20px;
    border-bottom:1px solid rgba(255,255,255,0.18);
}

footer{
    margin-top:40px;
    padding:22px 16px;
    text-align:center;
}

.logo img{
    width:auto;
    max-height:46px;
}

header nav,
footer nav{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:18px;
    min-width:0;
    max-width:100%;
    overflow-x:auto;
    white-space:nowrap;
    -webkit-overflow-scrolling:touch;
}

header nav::-webkit-scrollbar,
footer nav::-webkit-scrollbar{
    display:none;
}

header nav a,
footer nav a{
    position:relative;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    flex:0 0 auto;
    padding:6px 2px;
    color:var(--header-text);
    text-decoration:none;
    font-size:14px;
    font-weight:700;
    letter-spacing:.02em;
}

header nav a::after,
footer nav a::after{
    content:"";
    position:absolute;
    left:0;
    bottom:-3px;
    width:0;
    height:2px;
    background:#60a5fa;
    transition:width .25s ease;
}

header nav a:hover::after,
footer nav a:hover::after{
    width:100%;
}

header input{
    max-width:100%;
    margin-left:10px;
}

footer p{
    margin:0 0 12px;
    color:#d1d5db;
    font-size:13px;
}

/* =========================================================
全体レイアウト
========================================================= */

.container{
    display:flex;
    flex-wrap:wrap;
    align-items:flex-start;
    justify-content:space-between;
    gap:20px;
    width:100%;
    max-width:var(--container-max);
    margin:0 auto;
    padding:20px;
}

.main-content{
    flex:1 1 0;
    max-width:calc(100% - 324px);
    min-width:0;
}

.sidebar{
    flex:0 0 300px;
    width:300px;
    min-width:0;
    padding:16px;
    margin-top:20px;
    background:var(--sidebar-bg);
    border-radius:10px;
    position:sticky;
    top:20px;
    align-self:flex-start;
}

.main-content > .ad-area,
.main-content > .top-news,
.main-content > .sub-news{
    width:100%;
    max-width:var(--main-max);
}

/* =========================================================
PCヘッダー調整
========================================================= */

@media (min-width:641px){
    header{
        justify-content:flex-start;
        column-gap:28px;
        row-gap:0;
        padding:16px max(24px, calc((100vw - var(--container-max)) / 2)) 14px;
        border-bottom:1px solid var(--header-border);
        box-shadow:
            inset 0 1px 0 rgba(255,255,255,0.04),
            0 1px 0 rgba(0,0,0,0.08);
    }

    .logo{
        flex:0 0 auto;
        margin-bottom:0;
    }

    .logo img{
        max-height:50px;
    }

    header nav{
        flex:1 1 0;
        justify-content:flex-start;
        gap:24px;
        width:auto;
        max-width:none;
        overflow:visible;
        margin-top:0;
    }

    header nav a{
        padding:10px 0 9px;
        font-size:14px;
        font-weight:700;
        line-height:1.2;
        letter-spacing:.03em;
    }

    header nav a::after{
        bottom:-1px;
        background:var(--header-line);
    }

    footer{
        border-top:1px solid var(--header-border);
        padding-left:max(16px, calc((100vw - var(--container-max)) / 2));
        padding-right:max(16px, calc((100vw - var(--container-max)) / 2));
    }

    footer nav{
        gap:20px;
        overflow:visible;
        width:auto;
    }

    footer nav a{
        padding:6px 0;
        font-size:13px;
    }

    footer nav a::after{
        bottom:-2px;
        background:rgba(255,255,255,0.68);
    }

    .main-content > .ad-area,
    .main-content > .top-news,
    .main-content > .sub-news{
        margin-left:0;
        margin-right:auto;
    }
}

/* =========================================================
レスポンシブ
========================================================= */

@media (max-width:1023px){
    .container{
        gap:16px;
    }

    .main-content,
    .sidebar{
        flex:0 0 100%;
        max-width:100%;
        width:100%;
    }

    .sidebar{
        position:static;
        margin-top:0;
    }

    .main-content > .ad-area,
    .main-content > .top-news,
    .main-content > .sub-news{
        max-width:100%;
    }
}

@media (max-width:640px){
    header{
        flex-direction:column;
        align-items:center;
        padding:12px 12px 10px;
        border-bottom:1px solid var(--header-border);
        box-shadow:inset 0 1px 0 rgba(255,255,255,0.04);
    }

    .logo{
        margin-bottom:10px;
    }

    .logo img{
        max-height:42px;
    }

    header nav,
    footer nav{
        display:grid;
        grid-template-columns:repeat(2, minmax(0, 1fr));
        gap:0;
        width:100%;
        max-width:420px;
        overflow:visible;
        white-space:normal;
        justify-content:stretch;
        padding-bottom:2px;
    }

    footer nav{
        margin:0 auto;
    }

    header nav a,
    footer nav a{
        min-height:44px;
        padding:10px 8px;
        text-align:center;
        font-size:13px;
        font-weight:700;
        line-height:1.45;
        letter-spacing:.02em;
        border-bottom:1px solid var(--header-border);
    }

    header nav a:nth-child(odd),
    footer nav a:nth-child(odd){
        border-right:1px solid var(--header-border);
    }

    header nav a::after,
    footer nav a::after{
        display:none;
    }

    header nav a:hover,
    header nav a:focus,
    footer nav a:hover,
    footer nav a:focus{
        background:var(--header-hover);
    }

    header nav a:nth-last-child(-n+2),
    footer nav a:nth-last-child(-n+2){
        border-bottom:none;
    }

    footer{
        padding:22px 12px;
        border-top:1px solid var(--header-border);
    }
}

@media (max-width:480px){
    header input{
        width:100%;
        margin-left:0;
        margin-top:10px;
    }

    .container{
        padding-left:6px;
        padding-right:6px;
    }
}

@media (max-width:380px){
    header nav,
    footer nav{
        max-width:100%;
    }

    header nav a,
    footer nav a{
        min-height:42px;
        padding:9px 6px;
        font-size:12px;
        line-height:1.4;
    }
}