.lv-cms-backtop {
  --lv-cms-btt-progress: 0deg;
  position: fixed;
  right: clamp(18px, 2.2vw, 32px);
  bottom: max(22px, env(safe-area-inset-bottom));
  z-index: 950;
  width: 50px;
  height: 50px;
  padding: 2px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 999px;
  background: conic-gradient(from -90deg, var(--lv-accent, #ff8a00) var(--lv-cms-btt-progress), rgba(255,255,255,.16) 0deg);
  box-shadow: 0 14px 34px rgba(0,0,0,.22), 0 0 0 1px rgba(255,138,0,.08);
  box-shadow: 0 14px 34px rgba(0,0,0,.22), 0 0 0 1px color-mix(in srgb, var(--lv-accent, #ff8a00) 8%, transparent);
  color: #fff;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px) scale(.94);
  transition: opacity .24s ease, visibility .24s ease, transform .24s ease, box-shadow .24s ease, color .24s ease;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.lv-cms-backtop::before {
  content: "";
  position: absolute;
  inset: 3px;
  z-index: 0;
  border: 1px solid rgba(255,255,255,.10);
  border-radius: inherit;
  background: rgba(7,9,12,.94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.lv-cms-backtop svg {
  position: relative;
  z-index: 1;
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.65;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform .22s ease;
}

.lv-cms-backtop.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.lv-cms-backtop:hover {
  color: var(--lv-accent, #ff8a00);
  box-shadow: 0 18px 42px rgba(0,0,0,.28), 0 0 28px rgba(255,138,0,.17);
  box-shadow: 0 18px 42px rgba(0,0,0,.28), 0 0 28px color-mix(in srgb, var(--lv-accent, #ff8a00) 17%, transparent);
  transform: translateY(-3px) scale(1.02);
}

.lv-cms-backtop:hover svg { transform: translateY(-2px); }

.lv-cms-backtop:focus-visible {
  color: var(--lv-accent, #ff8a00);
  outline: 2px solid var(--lv-accent, #ff8a00);
  outline-offset: 4px;
}

.lv-cms-backtop:active { transform: translateY(-1px) scale(.97); }

@media (max-width: 680px) {
  .lv-cms-backtop {
    right: 14px;
    bottom: max(16px, env(safe-area-inset-bottom));
    width: 44px;
    height: 44px;
  }

  .lv-cms-backtop svg { width: 16px; height: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .lv-cms-backtop,
  .lv-cms-backtop svg { transition: none; }
}