@import url("/css/editorial-system.css?v=20260911-1");

/* Site-wide back-to-top control */
.scroll-top-button {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 2147483000;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 54px;
  height: 54px;
  padding: 0 13px;
  border: 2px solid #c89b18;
  border-radius: 999px;
  background: #102a43;
  color: #fff;
  box-shadow: 0 7px 22px rgba(10, 25, 47, .24);
  font: 800 .78rem/1 "Noto Sans JP", system-ui, sans-serif;
  letter-spacing: .02em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s ease, background .18s ease;
}

.scroll-top-button::before {
  content: "↑";
  font-size: 1.08rem;
  line-height: 1;
}

.scroll-top-button.is-visible {
  opacity: .96;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top-button:hover {
  background: #173a5e;
  color: #fff;
  transform: translateY(-2px);
}

.scroll-top-button:focus-visible {
  outline: 3px solid #f3d36a;
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .scroll-top-button {
    right: max(12px, env(safe-area-inset-right));
    bottom: max(12px, env(safe-area-inset-bottom));
    min-width: 48px;
    height: 48px;
    padding: 0 11px;
    font-size: .72rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-top-button {
    transition: none;
  }
}

@media print {
  .scroll-top-button {
    display: none !important;
  }
}