/* motion.css — skeleton, enter/exit, progress, reduced-motion
   Base: design-motion-principles (portfólio: presença + polish) */

:root {
  --motion-fast: 180ms;
  --motion-base: 280ms;
  --motion-slow: 400ms;
  --motion-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --skel-base: #141414;
  --skel-shine: rgba(255, 255, 255, 0.05);
}

/* Entrada */
.motion-enter {
  opacity: 0;
  transform: translateY(8px);
  animation: motion-enter var(--motion-base) var(--motion-ease) forwards;
  animation-delay: calc(var(--motion-i, 0) * 40ms);
}
@keyframes motion-enter {
  to { opacity: 1; transform: translateY(0); }
}

/* Saída (adicione .is-leaving no host) */
.motion-exit.is-leaving,
.is-leaving.motion-enter {
  animation: motion-exit var(--motion-fast) ease forwards;
}
@keyframes motion-exit {
  to { opacity: 0; transform: translateY(6px); }
}

/* Skeleton genérico */
.skel {
  position: relative;
  overflow: hidden;
  background: var(--skel-base);
  border-radius: 2px;
}
.skel::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, var(--skel-shine), transparent);
  animation: skel-shine 1.2s linear infinite;
}
@keyframes skel-shine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
.skel-line { height: 12px; margin-bottom: 8px; }
.skel-line.w-60 { width: 60%; }
.skel-line.w-40 { width: 40%; }
.skel-block { aspect-ratio: 3 / 4; width: 100%; }

/* Progresso linear */
.motion-progress {
  height: 2px;
  width: 100%;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.motion-progress > span {
  display: block;
  height: 100%;
  width: var(--p, 0%);
  background: rgba(255, 255, 255, 0.55);
  transition: width var(--motion-base) var(--motion-ease);
}
.motion-progress.is-indeterminate > span {
  width: 40%;
  animation: motion-indet 1.1s ease-in-out infinite;
}
@keyframes motion-indet {
  0% { transform: translateX(-120%); }
  100% { transform: translateX(320%); }
}

/* Fade de overlay / modal */
.motion-overlay {
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--motion-base) var(--motion-ease);
}
.motion-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
  .motion-enter,
  .motion-exit.is-leaving,
  .skel::after,
  .motion-progress.is-indeterminate > span {
    animation: none !important;
  }
  .motion-enter { opacity: 1; transform: none; }
  .motion-overlay { transition: none; }
}