/* mode-shell.css — Build / Collect / Play mode page containers + transitions. */

.mode-page {
  /* Each mode owns the entire viewport below the topbar. */
  display: block;
  width: 100%;
  height: calc(100vh - var(--topbar-h, 56px));
  overflow: hidden;
}

.mode-page[hidden] { display: none !important; }

/* Build mode hosts the existing 3-panel app-main grid; preserve its height. */
#build-mode .app-main {
  height: 100%;
}

/* Collect / Play placeholders shown until other agents fill them in. */
.mode-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  text-align: center;
  padding: 40px 24px;
  color: var(--text-muted);
}
.mode-placeholder h2 {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 10px;
}
.mode-placeholder p { font-size: 14px; }

/* ── Mode enter animation (fade + slight slide) ───────────── */
@keyframes mode-enter-anim {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.mode-page.mode-enter {
  animation: mode-enter-anim 200ms ease-out;
}

/* Mobile: shrink topbar offset. */
@media (max-width: 720px) {
  .mode-page {
    height: calc(100vh - var(--topbar-h-mobile, 48px));
  }
}

/* Reduced-motion overrides. */
body.reduce-motion .mode-page,
body.reduce-motion .mode-page.mode-enter { animation: none !important; }
@media (prefers-reduced-motion: reduce) {
  .mode-page.mode-enter { animation: none; }
}