.back-to-top {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 9999px;
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
  color: #fff;
  box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.45);
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.28s ease, visibility 0.28s, transform 0.28s ease;
}

.back-to-top:hover {
  filter: brightness(1.08);
}

.back-to-top:focus-visible {
  outline: 2px solid #818cf8;
  outline-offset: 3px;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.fixed-download-btn {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 55;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.85rem 0.65rem 0.85rem 0.85rem;
  border-radius: 0.75rem 0 0 0.75rem;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  color: #f8fafc;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  box-shadow: -4px 0 24px rgba(15, 23, 42, 0.35);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-right: none;
  text-decoration: none;
  transition: padding 0.2s ease, box-shadow 0.2s ease;
}

.fixed-download-btn:hover {
  padding-right: 0.85rem;
  box-shadow: -6px 0 32px rgba(79, 70, 229, 0.35);
}

.fixed-download-btn:focus-visible {
  outline: 2px solid #818cf8;
  outline-offset: 2px;
}

.fixed-download-btn i {
  font-size: 1.15rem;
  color: #a5b4fc;
}

@media (max-width: 640px) {
  .fixed-download-btn span {
    display: none;
  }
  .fixed-download-btn {
    padding: 0.75rem 0.5rem;
  }
}

/* Language dropdown */
.lang-dropdown {
  position: relative;
  display: inline-block;
}

.lang-dropdown-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.6rem;
  border-radius: 0.5rem;
  border: 1px solid #e2e8f0;
  background: #fff;
  color: #475569;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.lang-dropdown-btn:hover {
  border-color: #cbd5e1;
  background: #f8fafc;
  color: #1e293b;
}

.lang-dropdown-btn[aria-expanded="true"] {
  border-color: #818cf8;
  background: #eef2ff;
  color: #4f46e5;
}

.lang-dropdown-btn i.fa-chevron-down {
  font-size: 0.65rem;
  transition: transform 0.2s;
}

.lang-dropdown-btn[aria-expanded="true"] i.fa-chevron-down {
  transform: rotate(180deg);
}

.lang-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.25rem);
  right: 0;
  min-width: 8rem;
  padding: 0.25rem;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
  z-index: 50;
}

.lang-dropdown-menu.hidden {
  display: none;
}

.lang-dropdown-menu a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  color: #475569;
  font-size: 0.875rem;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.lang-dropdown-menu a:hover {
  background: #f1f5f9;
  color: #1e293b;
}

.lang-dropdown-menu a.is-current {
  background: #eef2ff;
  color: #4f46e5;
  font-weight: 600;
  pointer-events: none;
}

/* Hide scrollbar for navbar while keeping scroll */
header [class*="overflow-x-auto"] {
  -ms-overflow-style: none;
  scrollbar-width: none;
}
header [class*="overflow-x-auto"]::-webkit-scrollbar {
  display: none;
}