/* Premium publication polish: motion, glass surfaces, skeletons, ad spacing, mobile chrome */

:root {
  --ca-motion: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --ca-radius-premium: 1.25rem;
}

/* --- Reading progress (post) — subtle glow --- */
#readingProgress {
  box-shadow: 0 0 12px color-mix(in srgb, var(--ca-primary) 45%, transparent);
}

/* --- Glass header reinforcement --- */
.ca-header {
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--ca-border) 80%, transparent);
}

html.dark .ca-header {
  box-shadow: 0 1px 0 color-mix(in srgb, var(--ca-border) 50%, transparent);
}

/* --- Cards: lift + shadow (respect reduced motion) --- */
@media (hover: hover) and (pointer: fine) {
  .ca-card-modern,
  .ca-post-card.ca-card-modern {
    transition:
      transform var(--ca-motion),
      box-shadow var(--ca-motion),
      border-color var(--ca-motion);
  }

  .ca-card-modern:hover {
    transform: translateY(-3px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ca-card-modern:hover {
    transform: none;
  }
}

/* --- In-article AdSense: spacing + no accidental overlap --- */
.post-ad-slot {
  margin-top: 2.5rem;
  margin-bottom: 2.5rem;
  padding: 1rem 0.75rem;
  border-radius: var(--ca-radius-premium);
  border: 1px dashed color-mix(in srgb, var(--ca-border) 70%, transparent);
  background: color-mix(in srgb, var(--ca-surface-2) 55%, transparent);
}

html.dark .post-ad-slot {
  border-color: color-mix(in srgb, var(--ca-border) 90%, transparent);
  background: color-mix(in srgb, var(--ca-surface-2) 40%, transparent);
}

.post-ad-slot .adsbygoogle {
  min-height: 100px;
}

/* --- Deferred ad placeholder (before ins mounts) --- */
.ca-ad-slot--deferred {
  min-height: 120px;
}

/* --- Scroll to top --- */
#ca-scroll-top {
  position: fixed;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 1200;
  width: 3rem;
  height: 3rem;
  min-width: 44px;
  min-height: 44px;
  border-radius: 9999px;
  border: 1px solid var(--ca-border);
  background: color-mix(in srgb, var(--ca-surface) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--ca-text);
  box-shadow: 0 8px 28px rgb(0 0 0 / 0.12);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition:
    opacity var(--ca-motion),
    transform var(--ca-motion),
    background var(--ca-motion);
}

#ca-scroll-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

#ca-scroll-top:hover {
  background: color-mix(in srgb, var(--ca-primary) 12%, var(--ca-surface));
  border-color: color-mix(in srgb, var(--ca-primary) 35%, var(--ca-border));
}

html.dark #ca-scroll-top {
  background: color-mix(in srgb, var(--ca-surface-2) 88%, transparent);
  box-shadow: 0 8px 28px rgb(0 0 0 / 0.35);
}

/* --- Mobile bottom navigation --- */
.ca-mobile-bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1100;
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  gap: 0.25rem;
  padding: 0.5rem max(0.75rem, env(safe-area-inset-left)) calc(0.5rem + env(safe-area-inset-bottom))
    max(0.75rem, env(safe-area-inset-right));
  background: color-mix(in srgb, var(--ca-surface) 88%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-top: 1px solid var(--ca-border);
  box-shadow: 0 -4px 24px rgb(0 0 0 / 0.06);
}

html.dark .ca-mobile-bottom-nav {
  background: color-mix(in srgb, var(--ca-surface) 75%, #000);
  box-shadow: 0 -4px 24px rgb(0 0 0 / 0.25);
}

.ca-mobile-bottom-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  min-height: 48px;
  min-width: 0;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ca-muted);
  text-decoration: none;
  border-radius: 0.75rem;
  transition: color var(--ca-motion), background var(--ca-motion);
}

.ca-mobile-bottom-nav a[aria-current="page"] {
  color: var(--ca-primary);
  background: color-mix(in srgb, var(--ca-primary) 10%, transparent);
}

.ca-mobile-bottom-nav a:hover,
.ca-mobile-bottom-nav a:focus-visible {
  color: var(--ca-primary);
  outline: none;
}

.ca-mobile-bottom-nav svg {
  width: 1.35rem;
  height: 1.35rem;
}

@media (min-width: 768px) {
  .ca-mobile-bottom-nav {
    display: none;
  }
}

/* Reserve space so content isn’t hidden behind bottom bar */
@media (max-width: 767.98px) {
  body.ca-shell:not(.post-page) {
    padding-bottom: calc(4.25rem + env(safe-area-inset-bottom));
  }

  /* Float scroll button above bottom nav (non-post pages) */
  body:not(.post-page) #ca-scroll-top {
    bottom: calc(4.75rem + env(safe-area-inset-bottom));
  }
}

/* --- Skeleton loading (blog / cards) --- */
@keyframes ca-skeleton-pulse {
  0%,
  100% {
    opacity: 0.45;
  }
  50% {
    opacity: 0.9;
  }
}

.ca-skeleton {
  border-radius: 0.75rem;
  background: linear-gradient(
    90deg,
    var(--ca-surface-2) 0%,
    color-mix(in srgb, var(--ca-surface-2) 70%, var(--ca-border)) 50%,
    var(--ca-surface-2) 100%
  );
  background-size: 200% 100%;
  animation: ca-skeleton-pulse 1.4s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .ca-skeleton {
    animation: none;
    opacity: 0.55;
  }
}

.ca-skeleton-line {
  height: 0.85rem;
  margin-bottom: 0.5rem;
}

.ca-skeleton-line:last-child {
  width: 66%;
}

/* --- TOC active link polish --- */
.toc-link {
  transition:
    color var(--ca-motion),
    background-color var(--ca-motion),
    padding-left var(--ca-motion);
}