/* =========================
   Language FAB (PC + Mobile)
========================= */
.lang-fab{
    display: inline-flex;
    align-items: center;
    gap: 6px;
    position: fixed;
    right: 16px;
    bottom: 18px;
    z-index: 9999;

    height: 44px;
    padding: 0 14px;
    border-radius: 999px;

    border: 1px solid rgba(0,0,0,.12);
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 0 10px 22px rgba(0,0,0,.14);

    color: rgba(0,0,0,.86);
    font-weight: 800;
    letter-spacing: .5px;
    cursor: pointer;
}
.lang-fab:active{ transform: translateY(1px); }

/* =========================
   Sheet Overlay (更协调背景：雾感+模糊)
========================= */
.lang-sheet{
    position: fixed;
    inset: 0;
    z-index: 10000;
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease;
}
.lang-sheet.is-open{
    opacity: 1;
    pointer-events: auto;
}
.lang-sheet-bg{
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,.55);
    backdrop-filter: blur(6px) saturate(120%);
    -webkit-backdrop-filter: blur(6px) saturate(120%);
}

/* =========================
   Panel
   - PC: 居中
   - Mobile: 底部（但不全屏）
   ✅ max-height: calc(100vh - 300px)
   ✅ 玻璃拟态：与背景更协调
========================= */
.lang-sheet-panel{
    position: absolute;
    width: min(560px, calc(100% - 32px));
    max-height: calc(100vh - 300px);

    background: rgba(255,255,255,.78);
    backdrop-filter: blur(18px) saturate(160%);
    -webkit-backdrop-filter: blur(18px) saturate(160%);

    border: 1px solid rgba(255,255,255,.35);
    border-radius: 22px;
    box-shadow: 0 28px 90px rgba(0,0,0,.35);
    overflow: hidden;

    display: flex;
    flex-direction: column;
    transition: transform .22s ease;
}

/* PC 居中 */
@media (min-width: 901px){
    .lang-sheet-panel{
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%) scale(.98);
    }
    .lang-sheet.is-open .lang-sheet-panel{
        transform: translate(-50%, -50%) scale(1);
    }
}

/* Mobile 底部（不全屏） */
@media (max-width: 900px){
    .lang-sheet-panel{
        left: 50%;
        bottom: 86px; /* 留出右下角按钮空间 */
        transform: translateX(-50%) translateY(10px);
    }
    .lang-sheet.is-open .lang-sheet-panel{
        transform: translateX(-50%) translateY(0);
    }
}

/* header */
.lang-sheet-header{
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 14px 12px 14px;

    background: rgba(255,255,255,.55);
    border-bottom: 1px solid rgba(0,0,0,.06);
}
.lang-sheet-title{
    font-size: 14px;
    font-weight: 900;
    color: rgba(0,0,0,.75);
}
.lang-sheet-close{
    border: 1px solid rgba(0,0,0,.06);
    background: rgba(0,0,0,.06);
    width: 34px;
    height: 34px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    color: rgba(0,0,0,.7);
}

/* list scroll */
.lang-sheet-list{
    padding: 12px;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

/* items：半透明卡片，融入背景 */
.lang-sheet-item{
    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 12px 12px;
    margin: 8px 4px;
    border-radius: 14px;

    text-decoration: none;
    color: rgba(0,0,0,.86);

    background: rgba(255,255,255,.55);
    border: 1px solid rgba(0,0,0,.06);
    box-shadow: 0 10px 22px rgba(0,0,0,.06);
}
.lang-sheet-item:hover{
    background: rgba(255,255,255,.70);
}

/* ✅ 选中项：黑灰体系（更像“玻璃高亮”，不会突兀） */
.lang-sheet-item.is-active{
    background: rgba(255,255,255,.82);
    border-color: rgba(0,0,0,.18);
    box-shadow: 0 14px 30px rgba(0,0,0,.10);
}

.lang-sheet-item-name{
    font-size: 14px;
    font-weight: 900;
}
.lang-sheet-item-sub{
    margin-top: 4px;
    font-size: 12px;
    color: rgba(0,0,0,.55);
    font-weight: 700;
}

.lang-sheet-item-right{
    font-size: 18px;
    color: rgba(0,0,0,.40);
    font-weight: 900;
}

/* ✅ 勾勾/右侧符号：黑色 */
.lang-sheet-item.is-active .lang-sheet-item-right{
    color: rgba(0,0,0,.85);
}

@media (max-width: 420px){
    .lang-sheet-panel{
        width: calc(100% - 24px);
        bottom: 78px;
    }
}

.lang-icon{
    /* 黑白滤镜 */
    filter: invert(1)
}