/* ==========================================================================
   scroll-to-top.css — floating "back to top" control
   Loaded by assets/js/scroll-to-top.js on www and sibling *.sillylaird.ca hosts.
   Self-contained so sibling pages that do not load site.css still look right.
   Selectors are more specific than site.css's `a:hover` so the global link
   glow / scale does not leak onto the control.
   ========================================================================== */

a.scroll-to-top {
  --stt-bg: var(--bg, #000000);
  --stt-ink: var(--gold, #8b0000);
  --stt-border: var(--border, #3a0000);
  --stt-hover: var(--accent-cyan, #8b0000);
  position: fixed;
  right: max(0.85rem, env(safe-area-inset-right, 0px));
  bottom: max(1.1rem, env(safe-area-inset-bottom, 0px));
  z-index: 10050;
  box-sizing: border-box;
  width: 2.75rem;
  height: 2.75rem;
  margin: 0;
  padding: 0.2rem 0 0.15rem;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.05rem;
  border: 1px solid var(--stt-border);
  border-radius: 6px;
  background: var(--stt-bg);
  color: var(--stt-ink);
  font-family: "JetBrains Mono", "IBM Plex Mono", "Source Code Pro", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1;
  text-decoration: none;
  text-transform: uppercase;
  text-shadow: none;
  box-shadow:
    0 0 0 1px rgba(160, 0, 0, .18),
    0 0 14px -2px rgba(160, 0, 0, .4),
    inset 0 0 10px rgba(160, 0, 0, .12);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(10px);
  transition:
    opacity .2s ease,
    visibility .2s ease,
    transform .2s ease,
    color .15s ease,
    border-color .15s ease,
    box-shadow .25s ease,
    background-color .15s ease;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

a.scroll-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
}

a.scroll-to-top .scroll-to-top-caret {
  font-size: 0.85rem;
  letter-spacing: 0;
  line-height: 1;
  transform: translateY(1px);
}

a.scroll-to-top .scroll-to-top-label {
  font-size: 0.52rem;
  letter-spacing: 0.16em;
}

a.scroll-to-top:hover,
a.scroll-to-top:focus-visible {
  background: var(--stt-bg);
  color: var(--stt-hover);
  text-decoration: none;
  text-shadow:
    0 0 6px rgba(255, 0, 0, .85),
    0 0 14px rgba(139, 0, 0, .45);
  border-color: rgba(255, 0, 0, .75);
  border-radius: 6px;
  transform: none;
  box-shadow:
    0 0 0 1px rgba(255, 0, 0, .45),
    0 0 16px rgba(139, 0, 0, .4),
    0 0 32px -6px rgba(139, 0, 0, .35),
    inset 0 0 10px rgba(139, 0, 0, .08);
}

a.scroll-to-top:focus-visible {
  outline: 2px solid var(--stt-hover);
  outline-offset: 2px;
}

a.scroll-to-top:active {
  transform: translateY(1px);
}

/* Light theme — www uses body.light-mode; blog uses data-blog-theme */
body.light-mode a.scroll-to-top,
html[data-blog-theme="light"] a.scroll-to-top {
  --stt-bg: #fff8f1;
  --stt-ink: #8b0000;
  --stt-border: #e8c8c8;
  --stt-hover: #5a0000;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, .95) inset,
    0 8px 22px rgba(139, 0, 0, .16);
}

body.light-mode a.scroll-to-top:hover,
body.light-mode a.scroll-to-top:focus-visible,
html[data-blog-theme="light"] a.scroll-to-top:hover,
html[data-blog-theme="light"] a.scroll-to-top:focus-visible {
  background: #ffffff;
  color: #5a0000;
  text-shadow: none;
  border-color: #8b0000;
  box-shadow:
    0 0 0 1px rgba(139, 0, 0, .35),
    0 8px 22px rgba(139, 0, 0, .22);
}

/* When the visit-counter has no footer to live in, it docks bottom-right.
   Lift it so the two chips do not sit on top of each other. */
body.has-scroll-to-top #site-visit-counter[data-stt-docked="1"] {
  bottom: 4.65rem;
}

@media (max-width: 520px) {
  a.scroll-to-top {
    width: 2.55rem;
    height: 2.55rem;
    right: max(0.65rem, env(safe-area-inset-right, 0px));
    bottom: max(0.85rem, env(safe-area-inset-bottom, 0px));
  }
}

@media (prefers-reduced-motion: reduce) {
  a.scroll-to-top,
  a.scroll-to-top.is-visible,
  a.scroll-to-top:hover,
  a.scroll-to-top:focus-visible,
  a.scroll-to-top:active {
    transition: none;
    transform: none;
  }
}

@media print {
  a.scroll-to-top,
  .footer-back-to-top {
    display: none !important;
  }
}