/* ══════════════════════════════════════════════════════════════════
   LANGUAGE TOGGLE — Vietnamese / English
   Default: Vietnamese (vi). Toggle to English (en).
   ══════════════════════════════════════════════════════════════════ */

.lang-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.10);
  border: 1.5px solid rgba(255,255,255,0.22);
  border-radius: 999px;
  padding: 5px 14px 5px 10px;
  cursor: pointer;
  font-family: 'Work Sans', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  color: #FFFFFF;
  letter-spacing: 0.03em;
  transition: background 0.18s, border-color 0.18s, transform 0.12s;
  white-space: nowrap;
  flex-shrink: 0;
}

.lang-toggle-btn:hover {
  background: rgba(212,175,55,0.18);
  border-color: rgba(212,175,55,0.5);
  transform: translateY(-1px);
}

.lang-toggle-btn .lang-flag {
  font-size: 1rem;
  line-height: 1;
}

/* On dark nav (site-header) */
.site-header .lang-toggle-btn {
  background: rgba(212,175,55,0.12);
  border-color: rgba(212,175,55,0.30);
  color: #F4D068;
}

.site-header .lang-toggle-btn:hover {
  background: rgba(212,175,55,0.25);
  border-color: #D4AF37;
  color: #FFE066;
}

/* On portal header (dark green bg) */
.portal-header .lang-toggle-btn,
.pdash-header .lang-toggle-btn {
  background: rgba(212,175,55,0.10);
  border-color: rgba(212,175,55,0.28);
  color: #E5C378;
}

.portal-header .lang-toggle-btn:hover,
.pdash-header .lang-toggle-btn:hover {
  background: rgba(212,175,55,0.22);
  border-color: #D4AF37;
  color: #FFE066;
}

/* Animation when language switches */
[data-lang-target].lang-switching {
  opacity: 0;
  transition: opacity 0.15s ease;
}
[data-lang-target].lang-visible {
  opacity: 1;
  transition: opacity 0.2s ease;
}