/**
 * Tab switch — horizontal bar sweep (GPU-friendly, .app-main only).
 */

.app-main {
  isolation: isolate;
}

.app-main.is-tab-transitioning > *:not(.app-tab-transition) {
  visibility: hidden;
  pointer-events: none;
}

.app-tab-transition {
  position: absolute;
  inset: 0;
  z-index: 50;
  overflow: hidden;
  pointer-events: none;
  visibility: hidden;
  contain: strict;
}

.app-tab-transition.is-active {
  visibility: visible;
  pointer-events: auto;
}

/* Solid cover — no fade animation (avoids extra paints) */
.app-tab-transition__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  opacity: 1;
}

/* One moving layer: horizontal bars drawn with gradients */
.app-tab-transition__sweep {
  position: absolute;
  top: 0;
  left: 0;
  width: 115%;
  height: 100%;
  transform: translate3d(105%, 0, 0);
  transition: none;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  contain: strict;
}

.app-tab-transition__bars {
  position: absolute;
  inset: 5% 0;
  background:
    repeating-linear-gradient(
      180deg,
      transparent 0,
      transparent 16px,
      color-mix(in srgb, var(--primary, #3658ff) 52%, #ffffff) 16px,
      color-mix(in srgb, var(--primary, #3658ff) 68%, #ffffff) 44px,
      color-mix(in srgb, var(--primary, #3658ff) 45%, #e2e8f0) 44px,
      transparent 44px,
      transparent 58px
    ),
    linear-gradient(
      90deg,
      color-mix(in srgb, var(--primary, #3658ff) 12%, transparent) 0%,
      color-mix(in srgb, var(--primary, #3658ff) 28%, transparent) 50%,
      color-mix(in srgb, var(--primary, #3658ff) 10%, transparent) 100%
    );
  border-radius: 2px;
}

.app-tab-transition__edge {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(255, 255, 255, 0.9) 45%,
    color-mix(in srgb, var(--primary, #3658ff) 70%, #fff) 50%,
    rgba(255, 255, 255, 0.85) 55%,
    transparent
  );
}

.app-tab-transition.is-back .app-tab-transition__edge {
  left: auto;
  right: 0;
}

.app-tab-transition.is-animating .app-tab-transition__sweep {
  transition: transform 0.4s cubic-bezier(0.33, 1, 0.68, 1);
  will-change: transform;
}

.app-tab-transition.is-forward.is-animating .app-tab-transition__sweep {
  transform: translate3d(-105%, 0, 0);
}

.app-tab-transition.is-back .app-tab-transition__sweep {
  transform: translate3d(-105%, 0, 0);
}

.app-tab-transition.is-back.is-animating .app-tab-transition__sweep {
  transform: translate3d(105%, 0, 0);
}

body.theme-dark .app-tab-transition__veil,
.dark .app-tab-transition__veil {
  background: linear-gradient(180deg, #0f172a 0%, #0c1222 100%);
}

body.theme-dark .app-tab-transition__bars,
.dark .app-tab-transition__bars {
  background:
    repeating-linear-gradient(
      180deg,
      transparent 0,
      transparent 16px,
      color-mix(in srgb, var(--primary, #3658ff) 48%, #1e293b) 16px,
      color-mix(in srgb, var(--primary, #3658ff) 62%, #334155) 44px,
      color-mix(in srgb, var(--primary, #3658ff) 42%, #0f172a) 44px,
      transparent 44px,
      transparent 58px
    ),
    linear-gradient(
      90deg,
      color-mix(in srgb, var(--primary, #3658ff) 18%, transparent) 0%,
      color-mix(in srgb, var(--primary, #3658ff) 32%, transparent) 100%
    );
}

@media (prefers-reduced-motion: reduce) {
  .app-tab-transition {
    display: none !important;
  }

  .app-main.is-tab-transitioning > *:not(.app-tab-transition) {
    visibility: visible;
  }
}