/* ==========================================================================
   AshiucheOS — motion layer

   Four intentional motions, nothing else:
     1. Compose  — content settles in: opacity + a short upward translate.
     2. Reveal   — evidence and detail disclose with height + opacity.
     3. Sweep    — a single hairline pass when a value refreshes (never loops).
     4. Press    — springy tactile feedback on primary controls.

   Durations: 180 / 280 / 450 / 700ms. Entrances use ease-out cubic.
   Under prefers-reduced-motion every one of these collapses to an instant
   state change or a bare opacity fade; the 3D camera goes static.
   ========================================================================== */

/* ------------------------------- 1. Compose ------------------------------- */

/* Staging is gated on `html.js`, so a document without scripting — or with a
   failed module load — renders fully visible instead of blank. */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(var(--reveal-shift, 16px));
  transition:
    opacity var(--t-slow) var(--ease-out),
    transform var(--t-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
  /* Hard fail-safe: never leave content blank if the observer/module stalls. */
  animation: reveal-failsafe 0.01s linear 1.1s forwards;
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  will-change: auto;
  animation: none;
}
@keyframes reveal-failsafe {
  to { opacity: 1; transform: none; }
}

/* Hero composes with a longer, more cinematic settle. */
[data-reveal="hero"] {
  --reveal-shift: 26px;
  transition-duration: var(--t-cine);
}

/* Staggered list arrival, capped so a long list never crawls in. */
.js [data-stagger] > * {
  opacity: 0;
  transform: translateY(10px);
  transition:
    opacity var(--t-base) var(--ease-out),
    transform var(--t-base) var(--ease-out);
  animation: reveal-failsafe 0.01s linear 1.2s forwards;
}
[data-stagger].is-revealed > * {
  opacity: 1;
  transform: none;
  animation: none;
}
[data-stagger].is-revealed > *:nth-child(1) { transition-delay: 0ms; }
[data-stagger].is-revealed > *:nth-child(2) { transition-delay: 40ms; }
[data-stagger].is-revealed > *:nth-child(3) { transition-delay: 80ms; }
[data-stagger].is-revealed > *:nth-child(4) { transition-delay: 120ms; }
[data-stagger].is-revealed > *:nth-child(5) { transition-delay: 160ms; }
[data-stagger].is-revealed > *:nth-child(n + 6) { transition-delay: 200ms; }

/* ---------------------- 2. View transition between panes ---------------------- */

/* The Control Room swaps panes rather than reloading: the outgoing pane lifts
   away, the incoming pane settles down into place. */

.content.is-leaving {
  opacity: 0;
  transform: translateY(-6px);
  transition:
    opacity var(--t-quick) var(--ease-out),
    transform var(--t-quick) var(--ease-out);
}
.content.is-entering {
  opacity: 0;
  transform: translateY(10px);
}
.content {
  opacity: 1;
  transform: none;
  transition:
    opacity var(--t-base) var(--ease-out),
    transform var(--t-base) var(--ease-out);
}

/* Native view transitions where the browser supports them. */
@view-transition { navigation: auto; }

::view-transition-old(root) {
  animation: vt-out var(--t-quick) var(--ease-out) both;
}
::view-transition-new(root) {
  animation: vt-in var(--t-base) var(--ease-out) both;
}
@keyframes vt-out { to { opacity: 0; transform: translateY(-8px); } }
@keyframes vt-in { from { opacity: 0; transform: translateY(12px); } }

/* ------------------------------- 3. Reveal ------------------------------- */

.disclosure {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition:
    grid-template-rows var(--t-base) var(--ease-out),
    opacity var(--t-base) var(--ease-out);
}
.disclosure > * { overflow: hidden; }
.disclosure.is-open { grid-template-rows: 1fr; opacity: 1; }

/* --------------------------- 4. Press + hover --------------------------- */

.nav-item,
.ledger-row,
tbody tr.clickable {
  transition-timing-function: var(--ease-out);
}

.btn.primary::after {
  /* A brief brass wash rides across the primary action on hover. */
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(100deg, transparent 20%, rgba(255, 255, 255, 0.22), transparent 80%);
  transform: translateX(-120%);
  opacity: 0;
  pointer-events: none;
}
.btn.primary:hover::after {
  animation: btn-wash var(--t-cine) var(--ease-out) 1;
}
@keyframes btn-wash {
  0% { transform: translateX(-120%); opacity: 0; }
  35% { opacity: 1; }
  100% { transform: translateX(120%); opacity: 0; }
}

/* Rows lift a hairline toward brass while pointed at. */
.panel .attn-item,
.panel .def-row {
  transition:
    border-color var(--t-base) var(--ease-out),
    background var(--t-base) var(--ease-out),
    transform var(--t-base) var(--ease-out);
}
.panel .def-row:hover { border-color: var(--line); }

/* --------------------------- Reduced-motion path --------------------------- */

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal],
  .js [data-stagger] > * {
    opacity: 1;
    transform: none;
    transition: opacity 120ms linear;
    animation: none;
  }
  .content.is-entering,
  .content.is-leaving { opacity: 1; transform: none; }
  .disclosure { transition: opacity 120ms linear; }
  .btn.primary:hover::after { animation: none; }
  ::view-transition-old(root),
  ::view-transition-new(root) { animation: none; }
}