.scroll-top {
  position: fixed;
  right: 14px;
  bottom: max(22px, env(safe-area-inset-bottom));
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 68px;
  height: 48px;
  padding: 0 15px 0 13px;
  border: 1px solid rgba(35, 216, 237, .35);
  border-radius: 999px;
  background: rgba(7, 26, 51, .94);
  color: #fff;
  box-shadow: 0 14px 40px rgba(3, 16, 37, .28);
  font: 800 10px "DM Sans", sans-serif;
  letter-spacing: .11em;
  text-transform: uppercase;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity .22s ease, transform .22s ease, visibility .22s, background .2s, border-color .2s;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.scroll-top[hidden] { display: none; }
.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}
.scroll-top svg {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform .2s;
}
.scroll-top:hover { background: #0c2748; border-color: var(--cyan); }
.scroll-top:hover svg { transform: translateY(-2px); }
.scroll-top:focus-visible { outline: 3px solid rgba(35, 216, 237, .4); outline-offset: 3px; }
@media (max-width: 1100px) {
  .scroll-top {
    right: 10px;
    bottom: max(15px, env(safe-area-inset-bottom));
    width: 46px;
    min-width: 46px;
    height: 46px;
    padding: 0;
    justify-content: center;
  }
  .scroll-top span {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .scroll-top { transition: none; }
  .scroll-top svg { transition: none; }
}