/* ============================================================
   BarqNews Pro — 14 — UI Utilities (scroll-top, progress, skeleton)
   ============================================================ */

/* ---------- Reading progress bar ---------- */
#reading-progress-bar {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  height: 3px;
  background: var(--site-color);
  width: 0%;
  z-index: 9999;
  transition: width 0.08s linear;
  box-shadow: 0 0 8px rgba(var(--site-color-rgb), 0.5);
  pointer-events: none;
}

/* ---------- Scroll-to-top ---------- */
#scroll-top {
  position: fixed;
  bottom: 80px;
  left: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--site-color);
  color: white;
  border: none;
  display: grid;
  place-items: center;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(var(--site-color-rgb), 0.4);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base), background var(--transition-fast);
  z-index: 997;
}
.ltr #scroll-top { left: auto; right: 24px; }

#scroll-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
#scroll-top:hover {
  background: var(--site-color-darker-2);
  transform: translateY(-3px);
}

/* ---------- Skeleton ---------- */
.skeleton-loader {
  background: linear-gradient(90deg,
    var(--skeleton-from) 25%,
    var(--skeleton-to) 50%,
    var(--skeleton-from) 75%);
  background-size: 200% 100%;
  animation: skeletonWave 1.5s infinite;
  border-radius: var(--glob-border-radius);
}
@keyframes skeletonWave {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}

/* ---------- Continue reading gradient ---------- */
.continue-reading {
  position: relative;
  max-height: 240px;
  overflow: hidden;
}
.continue-reading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(to bottom, transparent, var(--bg-color));
  pointer-events: none;
}
.continue-reading-btn {
  display: block;
  margin: -40px auto 24px;
  position: relative;
  z-index: 2;
  padding: 12px 32px;
  border: none;
  border-radius: var(--glob-border-radius);
  background: var(--site-color);
  color: white;
  font-family: var(--site-font);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(var(--site-color-rgb), 0.35);
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.continue-reading-btn:hover {
  background: var(--site-color-darker-2);
  transform: translateY(-2px);
}

/* ---------- Focus visibility ---------- */
:focus-visible {
  outline: 2px solid var(--site-color);
  outline-offset: 2px;
  border-radius: 4px;
}
button:focus-visible,
a:focus-visible {
  outline-offset: 3px;
}

/* ---------- Visually-hidden (sr-only) ---------- */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 575px) {
  #scroll-top { bottom: 72px; left: 12px; width: 40px; height: 40px; }
  .ltr #scroll-top { right: 12px; }
}