/* PREMIUM YUKARI CIK BUTONU - progress circle + fade/slide */
#scrollTopBtn {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 56px;
  height: 56px;
  border: 0;
  padding: 0;
  border-radius: 50%;
  background: rgba(2, 11, 28, 0.92);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(18px) scale(0.96);
  transition: opacity .35s ease, visibility .35s ease, transform .35s ease, box-shadow .35s ease;
  z-index: 99999;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
}

#scrollTopBtn.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#scrollTopBtn:hover {
  transform: translateY(-5px) scale(1.06);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.42);
}

#scrollTopBtn:active {
  transform: translateY(-2px) scale(0.98);
}

#scrollTopBtn svg {
  position: absolute;
  inset: 0;
  width: 56px;
  height: 56px;
  transform: rotate(-90deg);
}

#scrollTopBtn .scroll-track {
  stroke: rgba(255, 255, 255, 0.16);
}

#scrollTopBtn .scroll-progress {
  stroke: #ff2b2b;
  stroke-linecap: round;
  transition: stroke-dashoffset .12s linear;
}

#scrollTopBtn .scroll-arrow {
  position: relative;
  z-index: 2;
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  #scrollTopBtn {
    width: 50px;
    height: 50px;
    right: 16px;
    bottom: 72px; /* mobilde CTA ile çakışmaz */
  }

  #scrollTopBtn svg {
    width: 50px;
    height: 50px;
  }
}