/* Shared language switcher (index, legal pages, blog) — requires --primary, --text-muted */
:root {
    --fd-motion-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --fd-motion-fast: 280ms;
    --fd-motion-medium: 420ms;
}
@keyframes fd-dropdown-pop {
    from { opacity: 0; transform: translateY(-8px) scale(0.94); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
.lang-switcher-wrap {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 6px;
}
.lang-dropdown { position: relative; }
.lang-switcher-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 10px;
    color: var(--primary);
    font-weight: 900;
    padding: 2px 8px 2px 10px;
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    cursor: pointer;
    transition: transform var(--fd-motion-fast) var(--fd-motion-spring), background-color var(--fd-motion-fast) ease, border-color var(--fd-motion-fast) ease, color var(--fd-motion-fast) ease, box-shadow var(--fd-motion-fast) var(--fd-motion-spring);
    font-family: inherit;
    line-height: 1.2;
}
.lang-switcher-btn:active {
    transform: scale(0.97);
}
.lang-switcher-btn:hover, .lang-switcher-btn[aria-expanded="true"] {
    background: var(--primary);
    color: white;
}
.lang-switcher-btn:hover #currentLangTag, .lang-switcher-btn[aria-expanded="true"] #currentLangTag { color: inherit; }
#currentLangTag {
    pointer-events: none;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
}
.lang-switcher-caret {
    font-size: 7px;
    opacity: 0.9;
    line-height: 1;
    transform: translateY(1px);
    pointer-events: none;
}
.lang-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    margin: 0;
    padding: 4px 0;
    list-style: none;
    min-width: 148px;
    background: #0f172a;
    border: 1px solid rgba(99, 102, 241, 0.35);
    border-radius: 10px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.55);
    z-index: 7000;
    transform-origin: top center;
}
.lang-menu:not([hidden]) {
    animation: fd-dropdown-pop var(--fd-motion-medium) var(--fd-motion-spring) both;
}
.lang-menu[hidden] { display: none !important; }
.lang-menu li {
    margin: 0 !important;
    padding: 9px 14px;
    padding-left: 14px !important;
    font-size: 11px;
    font-weight: 700;
    color: #e2e8f0;
    cursor: pointer;
    transition: transform var(--fd-motion-fast) var(--fd-motion-spring), background-color var(--fd-motion-fast) ease;
}
.lang-menu li:active {
    transform: scale(0.985);
}
.lang-menu li::before {
    content: none !important;
    display: none !important;
}
.lang-menu li:hover, .lang-menu li:focus-visible {
    background: rgba(99, 102, 241, 0.22);
    outline: none;
}
.lang-menu li.is-active {
    color: #a5b4fc;
    background: rgba(99, 102, 241, 0.12);
}
.lang-help-wrap { position: relative; flex-shrink: 0; }
.lang-help-trigger {
    width: 24px;
    height: 24px;
    min-width: 24px;
    min-height: 24px;
    border-radius: 50%;
    border: 1px solid rgba(99, 102, 241, 0.35);
    background: rgba(15, 23, 42, 0.7);
    color: var(--primary);
    font-weight: 900;
    font-size: 11px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    line-height: 1;
    font-family: inherit;
    transition: transform var(--fd-motion-fast) var(--fd-motion-spring), background-color var(--fd-motion-fast) ease, border-color var(--fd-motion-fast) ease, color var(--fd-motion-fast) ease;
}
.lang-help-trigger:active {
    transform: scale(0.92);
}
.lang-help-trigger:hover, .lang-help-trigger[aria-expanded="true"] {
    background: rgba(99, 102, 241, 0.25);
    color: white;
}
.lang-help-popover {
    position: absolute;
    left: 0;
    top: calc(100% + 6px);
    width: max-content;
    max-width: min(240px, calc(100vw - 24px));
    padding: 8px 10px;
    font-size: 10px;
    font-weight: 600;
    line-height: 1.45;
    color: var(--text-muted);
    background: #111827;
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 10px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5);
    z-index: 7001;
    transform-origin: top left;
}
.lang-help-popover:not([hidden]) {
    animation: fd-dropdown-pop var(--fd-motion-medium) var(--fd-motion-spring) both;
}
.lang-help-popover[hidden] { display: none !important; }

.legal-header-lang { position: relative; z-index: 10001; isolation: isolate; }

/* Blog article pages share the legal/about header rhythm. */
nav.navbar:has(.blog-nav-right) {
    position: sticky;
    top: 0;
    height: auto;
    min-height: 70px;
    padding: 15px 25px;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    z-index: 9999;
    isolation: isolate;
    backdrop-filter: blur(20px);
}
nav.navbar:has(.blog-nav-right) .nav-logo img {
    height: 40px;
    width: auto;
    display: block;
    transition: none;
}
nav.navbar:has(.blog-nav-right) .nav-logo:hover img {
    transform: none;
    filter: none;
}
.blog-nav-right {
    display: flex !important;
    align-items: center !important;
    justify-content: flex-end;
    gap: 10px !important;
    position: relative;
    z-index: 10001;
}
.blog-nav-right .lang-menu,
.blog-nav-right .lang-help-popover {
    left: auto;
    right: 0;
}
.blog-nav-right .nav-back {
    position: absolute;
    top: calc(100% + 34px);
    right: 0;
    color: var(--primary);
    border: 0;
    padding: 0;
    border-radius: 0;
    background: transparent;
    font-weight: 800;
    white-space: nowrap;
}
.blog-nav-right .nav-back:hover {
    color: #a5b4fc;
    background: transparent;
    border-color: transparent;
    transform: translateX(-5px);
}
body .article-wrapper {
    max-width: 900px;
    margin: 40px auto 60px auto;
    padding: 0 20px 80px;
}
body .article-footer {
    margin-top: 40px;
    padding: 30px 20px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    opacity: 1;
}

@media (max-width: 640px) {
    nav.navbar:has(.blog-nav-right) {
        flex-wrap: wrap;
        gap: 10px;
        padding: 12px 16px;
    }
    .blog-nav-right .nav-back {
        top: calc(100% + 22px);
        right: 0;
    }
    body .article-wrapper {
        margin: 24px auto 40px auto;
        padding: 0 max(16px, env(safe-area-inset-left)) 60px max(16px, env(safe-area-inset-right));
    }
}

@media (prefers-reduced-motion: reduce) {
    .lang-menu:not([hidden]),
    .lang-help-popover:not([hidden]) {
        animation: none !important;
    }
    .lang-switcher-btn,
    .lang-help-trigger,
    .lang-menu li {
        transition-duration: 0.01ms !important;
    }
    .lang-switcher-btn:active,
    .lang-help-trigger:active,
    .lang-menu li:active {
        transform: none !important;
    }
}