/* ============================================================================
   NAVIGATION  -  the dropdown's opening motion
   ----------------------------------------------------------------------------
   The redesign opens each group's menu with a short fade and an 8px settle
   ("menuIn" in the draft). It lives here rather than in the page kit because
   the navigation is a design-system component and must not depend on a route
   module's stylesheet.

   `:not([hidden])` is what replays it: the panel is hidden with the `hidden`
   attribute, so the animation runs each time the group opens instead of once
   per mount. app.css collapses it to 0.01ms under prefers-reduced-motion.
   ========================================================================= */

@layer theme, base, components, utilities;

@layer components {
  .sh-nav-menu:not([hidden]) {
    animation: sh-nav-menu-in var(--motion-duration-base)
      var(--motion-ease-entrance) both;
  }

  /* The "-ER" after "SHARP" in the brand, sliding out from behind the P and
     fading in once the page has settled. The same reveal the home hero used to
     run on its wordmark, now owned by the navigation. The suffix sits in its
     own box whose inline-start edge is the P's right edge, and that box clips;
     the mark starts a full box-width back - entirely beside "SHARP", so
     nothing overlaps it - and travels forward to rest, with the opacity
     reaching 1 before the travel ends, so the glyphs read as solid for the
     last, slowest part of the decelerating slide. The translate is physical
     (translateX) on purpose: the lockup row is pinned to dir="ltr" because a
     Latin wordmark never mirrors, so the P is always left of the suffix, in
     Arabic too.

After that one-time reveal the mark keeps breathing: after a long rest
      (~26s of stillness per cycle) it slides back out from behind the P and
      returns, so the wordmark quietly draws the eye without the glyphs moving
      while they are visible. On the home page none of this runs (Brand.tsx
      drops the classes when the lockup links the page you are on): the hero
      there plays the same reveal once, and a second, looping copy right above
      it would be jarring. The two
     animations are sequenced by delay - the reveal (once, `both` fill, so the
     suffix stays hidden through its delay instead of flashing in) hands over
     to the loop, whose later position in the list wins from its start, and
     whose own delay is when the revealed lockup is simply at rest. Pure CSS,
     so it runs from the server-rendered HTML without waiting for hydration.
     Under prefers-reduced-motion both animations are removed outright -
     app.css only collapses the duration and would leave the delay holding the
     suffix hidden - so the full name is simply there from the start. */
  .sh-brand-suffix {
    overflow: hidden;
  }

  .sh-brand-suffix__mark {
    animation:
      sh-brand-suffix-in var(--motion-duration-reveal)
        var(--motion-ease-entrance) var(--motion-delay-reveal) both,
      sh-brand-breathe calc(var(--motion-duration-reveal) * 37.5)
        ease-in-out calc(var(--motion-duration-reveal) * 5) infinite;
  }

  @media (prefers-reduced-motion: reduce) {
    .sh-brand-suffix__mark {
      animation: none;
    }
  }
}

@keyframes sh-brand-suffix-in {
  from {
    opacity: 0;
    transform: translateX(-100%);
  }

  60% {
    opacity: 1;
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* One 30s breath: dwell at rest (~26s - the stillness is what stretches, the
   gestures stay at a human pace), slide back out behind the P (the reverse of
   the reveal - solid while it pulls away, fading as it leaves), pass on
   hidden, then play the reveal again, and hold. Looped, with the cycle ending
   where it starts so the seam is invisible. Each slide is ONE eased interval
   of roughly one reveal duration - the opacity stop inside the out-slide is
   opacity-only, so it never splits the transform's easing and the glyphs
   cannot stall or hitch mid-gesture. */
@keyframes sh-brand-breathe {
  /* settled */
  0%, 87% {
    transform: translateX(0);
    opacity: 1;
    animation-timing-function: var(--motion-ease-standard);
  }

  /* pull back solid - opacity only, so the 87→90 transform still runs one
     eased interval and the slide never hitches */
  88.5% {
    opacity: 1;
  }

  /* gone, behind the P */
  90% {
    transform: translateX(-100%);
    opacity: 0;
  }

  /* pass, hidden, then the reveal again - one eased slide back in */
  94% {
    transform: translateX(-100%);
    opacity: 0;
    animation-timing-function: var(--motion-ease-entrance);
  }

  97% {
    transform: translateX(0);
    opacity: 1;
  }

  /* settled until the cycle hands over (0% is settled too) */
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes sh-nav-menu-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}