/* Language switcher — 白背景・黒文字（サイズは初版準拠） */
.lang-switcher {
    position: fixed;
    top: max(0.75rem, env(safe-area-inset-top));
    right: max(0.75rem, env(safe-area-inset-right));
    z-index: 50;
}
.lang-switcher__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.62rem 0.95rem;
    border-radius: 0.35rem;
    border: 1px solid #111827;
    background: #ffffff;
    color: #111827;
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    box-shadow: 0 1px 2px rgba(17, 24, 39, 0.08);
    cursor: pointer;
    transition: background 0.15s ease, box-shadow 0.15s ease;
}
.lang-switcher__btn:hover {
    background: #f9fafb;
    box-shadow: 0 2px 5px rgba(17, 24, 39, 0.1);
}
.lang-switcher__btn:active {
    background: #f3f4f6;
}
.lang-switcher__icon {
    font-size: 0.9rem;
    line-height: 1;
}
.lang-switcher__label {
    color: #111827;
    font-weight: 800;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.lang-switcher__sep {
    color: #9ca3af;
    font-weight: 400;
}
.lang-switcher__current {
    color: #111827;
    font-weight: 900;
    font-size: 0.78rem;
}
.lang-switcher__caret {
    color: #6b7280;
    font-size: 0.62rem;
    margin-left: 0.1rem;
}
.lang-switcher__menu {
    display: none;
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 10.5rem;
    padding: 0.35rem;
    border-radius: 0.4rem;
    border: 1px solid #111827;
    background: #ffffff;
    box-shadow: 0 16px 36px rgba(17, 24, 39, 0.12);
}
.lang-switcher.is-open .lang-switcher__menu { display: block; }
.lang-switcher__item {
    width: 100%;
    text-align: left;
    padding: 0.58rem 0.72rem;
    border: none;
    border-radius: 0.28rem;
    background: transparent;
    font-size: 0.82rem;
    font-weight: 700;
    color: #111827;
    cursor: pointer;
    transition: background 0.12s ease;
}
.lang-switcher__item:hover {
    background: #f3f4f6;
}
.lang-switcher__item.is-active {
    background: #e5e7eb;
    color: #111827;
    font-weight: 700;
}