.app-shell {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  min-width: 100vw;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 25% 20%, rgba(119, 41, 83, 0.2), transparent 65%);
}

@supports (min-height: 100dvh) {
  .app-shell {
    min-height: 100dvh;
  }
}

.visual-stage {
  position: relative;
  flex: 1 1 auto;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.visual-stage canvas {
  width: 100%;
  height: 100%;
}

.app-shell.is-casting .visual-stage canvas {
  opacity: 0;
  visibility: hidden;
}

.app-shell.is-casting [data-role='koi-tip'],
.app-shell.is-casting [data-role='visualizer-placeholder'],
.app-shell.is-casting [data-role='webgl-placeholder'] {
  display: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
}

.cast-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: var(--space-16);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-medium), transform var(--transition-medium);
}

.app-shell.is-casting .cast-overlay {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.site-footer {
  position: fixed;
  inset-inline: 0;
  inset-block-end: env(safe-area-inset-bottom, 0);
  width: 100%;
  padding: var(--space-6) 0;
  padding-bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0));
  display: flex;
  justify-content: center;
  pointer-events: none;
  z-index: 12;
}

.footer-bar {
  width: min(960px, 100%);
}

.welcome-screen,
.overlay-backdrop,
.overlay-panel {
  position: fixed;
  inset: 0;
}

.welcome-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-overlay);
  z-index: 10;
}

.overlay-backdrop {
  background: rgba(5, 6, 12, 0.75);
  backdrop-filter: blur(16px);
  z-index: 9;
}

.overlay-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-24);
  z-index: 11;
  overflow-y: auto;
}


.export-panel {
  position: fixed;
  top: var(--space-10);
  right: var(--space-10);
  pointer-events: none;
  z-index: 13;
}

.export-panel:not(.is-hidden) {
  pointer-events: auto;
}

.export-panel.is-hidden {
  display: none;
}

@media (max-width: 600px) {
  .welcome-screen {
    padding: 0;
  }

  .overlay-panel {
    padding: 0;
    align-items: stretch;
    justify-content: stretch;
  }
  .export-panel {
    top: var(--space-8);
    right: var(--space-8);
    left: var(--space-8);
  }
}