/* ── 404 page ────────────────────────────────────────────────────────────── */
#not-found {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  padding-bottom: 4rem;
  gap: 1.75rem;
}

/* Optical centering on desktop — extra bottom padding pulls the
   composition slightly above the geometric midpoint. */
@media (min-width: 768px) {
  #not-found {
    padding-bottom: 18vh;
  }
}

.err-code {
  font-family: var(--my-font-ui);
  font-size: 4rem;
  font-weight: 500;
  padding-bottom: 2rem;
  letter-spacing: -0.03em;
  color: var(--my-black);
  line-height: 1;
  margin: 0;
}

#the-kitty {
  width: clamp(8rem, 22vw, 13rem);
  height: auto;
  display: block;
  /* Gentle settle-in on load (adds a slight float-up over the opacity fade).
     The element's own resting state is opacity:1 / no transform, and the
     animation has NO backwards/forwards fill — so it can only override opacity
     *while running*. If the animation is ever paused or never plays (throttled
     background tab, reduced motion), the cat stays visible rather than stuck. */
  opacity: 1;
  animation: kittySettle var(--motion-slow) ease-out;
}

@keyframes kittySettle {
  from { opacity: 0; transform: translateY(8px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)   scale(1);    }
}

@media (prefers-reduced-motion: reduce) {
  #the-kitty { animation: none; opacity: 1; transform: none; }
}
html[data-bs-theme="dark"] #the-kitty {
  filter: invert(1);
}

.err-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.err-title {
  font-family: var(--my-font-ui);
  font-size: 1rem;
  font-weight: 600;
  color: var(--my-black);
  margin: 0;
}

.err-sub {
  font-family: var(--my-font-ui);
  font-size: 0.95rem;
  color: var(--my-gray-3);
  margin: 0;
  line-height: 1.7;
}

.err-sub a {
  color: var(--bs-body-color);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.err-sub a:hover {
  text-decoration-color: var(--my-theme-day);
}

html[data-bs-theme="dark"] .err-sub a:hover {
  text-decoration-color: var(--my-theme-night);
}