.scroll-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 999;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid rgba(184, 134, 11, 0.4);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  color: #0f1f3f;
  box-shadow: 0 4px 18px rgba(15, 31, 63, 0.14);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0.25s ease,
    background 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.scroll-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background: #0f1f3f;
  color: #daa520;
  border-color: #b8860b;
  box-shadow: 0 6px 22px rgba(15, 31, 63, 0.24);
}

.scroll-to-top:focus-visible {
  outline: 2px solid #b8860b;
  outline-offset: 3px;
}

[data-theme='dark'] .scroll-to-top {
  background: rgba(37, 37, 71, 0.95);
  color: #dfc978;
  border-color: rgba(218, 165, 32, 0.45);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
}

[data-theme='dark'] .scroll-to-top:hover {
  background: #8b6914;
  color: #fff;
  border-color: #dfc978;
}

@media (max-width: 700px) {
  .scroll-to-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }

  .scroll-to-top svg {
    width: 18px;
    height: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-to-top {
    transition: opacity 0.15s ease, visibility 0.15s ease;
    transform: none;
  }

  .scroll-to-top.is-visible {
    transform: none;
  }
}