/* SVEA motion system v2
   Principle: motion must support orientation, hierarchy or state.
   No scroll-jacking, autoplay loops or layout-triggering animation. */

:root {
  --motion-fast: 160ms;
  --motion-base: 360ms;
  --motion-slow: 520ms;
  --motion-arrival: 420ms;
  --motion-ease: cubic-bezier(.2,.75,.25,1);
  --motion-distance: 12px;
}

.motion-hero {
  opacity: 0;
  transform: translate3d(0, 10px, 0);
  transition:
    opacity var(--motion-slow) var(--motion-ease),
    transform var(--motion-slow) var(--motion-ease);
  will-change: opacity, transform;
}

.motion-hero.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

/* First-arrival signature: one non-blocking brand cue per browser session. */
.motion-first-arrival {
  position: relative;
}

.svea-first-arrival-line {
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: -8px;
  width: min(112px, 30%);
  height: 1px;
  background: linear-gradient(90deg, currentColor 0%, currentColor 72%, transparent 100%);
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

.motion-first-arrival.is-arrived .svea-first-arrival-line {
  animation: svea-first-arrival-line var(--motion-arrival) var(--motion-ease) both;
}

.motion-first-arrival .svea-first-arrival-item {
  opacity: .94;
  transform: translate3d(0, 5px, 0);
  transition:
    opacity 300ms var(--motion-ease),
    transform 300ms var(--motion-ease);
}

.motion-first-arrival.is-arrived .svea-first-arrival-item {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.motion-first-arrival .svea-arrival-delay-1 { transition-delay: 35ms; }
.motion-first-arrival .svea-arrival-delay-2 { transition-delay: 80ms; }
.motion-first-arrival .svea-arrival-delay-3 { transition-delay: 125ms; }
.motion-first-arrival .svea-arrival-delay-4 { transition-delay: 170ms; }

@keyframes svea-first-arrival-line {
  0% {
    opacity: 0;
    transform: scaleX(0);
  }
  28% {
    opacity: .48;
  }
  68% {
    opacity: .48;
    transform: scaleX(1);
  }
  100% {
    opacity: 0;
    transform: scaleX(1);
  }
}

.motion-reveal {
  opacity: 0;
  transform: translate3d(0, var(--motion-distance), 0);
  transition:
    opacity var(--motion-base) var(--motion-ease),
    transform var(--motion-base) var(--motion-ease);
  transition-delay: var(--motion-delay, 0ms);
  will-change: opacity, transform;
}

.motion-reveal.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.motion-stagger > .motion-stagger-item {
  opacity: 0;
  transform: translate3d(0, 8px, 0);
  transition:
    opacity var(--motion-base) var(--motion-ease),
    transform var(--motion-base) var(--motion-ease);
  transition-delay: calc(var(--motion-index, 0) * 55ms);
}

.motion-stagger.is-visible > .motion-stagger-item {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

/* Micro-interactions: only elements that are already interactive. */
@media (hover: hover) and (pointer: fine) {
  :where(a, button, summary, [role="button"]).svea-interactive {
    transition:
      transform var(--motion-fast) var(--motion-ease),
      box-shadow var(--motion-fast) var(--motion-ease),
      border-color var(--motion-fast) var(--motion-ease),
      background-color var(--motion-fast) var(--motion-ease);
  }

  :where(a, button, summary, [role="button"]).svea-interactive:hover {
    transform: translate3d(0, -2px, 0);
  }
}

/* Reduced motion is a hard override, not a cosmetic preference. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
  }

  .motion-hero,
  .motion-reveal,
  .motion-stagger > .motion-stagger-item,
  .motion-first-arrival .svea-first-arrival-item,
  :where(a, button, summary, [role="button"]).svea-interactive {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    animation: none !important;
    will-change: auto !important;
  }

  .svea-first-arrival-line {
    display: none !important;
  }
}