:root {
    --header-height: 56px;
}

/* Desktop 預設隱藏；手機版由 media query 顯示 */
#mobileMenuBtn {
    display: none;
}

@media (max-width: 768px) {
    #mobileMenuBtn {
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
    }
}

.header {
    border-bottom: 1px solid #1a1a1a !important;
}

.header .clock-date,
.header .clock-time {
    color: #c8d8e8 !important;
}

.header .header-avatar {
    background: #1c1c1c !important;
    border: 1px solid #2a2a2a !important;
    color: #9ab8d0 !important;
}

.lang-btn {
    background: transparent;
    border: 1px solid #383838;
    color: #9ab8d0;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 11px;
    border-radius: 6px;
    cursor: pointer;
    letter-spacing: 0.4px;
    transition: all 0.15s;
    white-space: nowrap;
    font-family: inherit;
    line-height: 1.4;
    touch-action: manipulation;
}

.lang-btn:hover {
    background: #1a1a1a;
    color: #e0e8f0;
}

.lang-btn.is-zh {
    color: #ff9d6f;
    border-color: rgba(255, 107, 53, 0.55);
}