.device-stage {
  width: 100%;
  min-height: 100dvh;
}

.app-shell {
  position: relative;
  width: 100%;
  max-width: 430px;
  min-height: 100dvh;
  margin: 0 auto;
  overflow-x: hidden;
  overflow-y: auto;
  background: var(--color-bg);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
  min-height: var(--topbar-height);
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  padding: 12px var(--space-4);
  background: var(--color-topbar);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: blur(18px);
}

.topbar__copy {
  min-width: 0;
}

.topbar__copy p {
  margin-bottom: 2px;
  color: var(--color-muted);
  font-size: var(--font-xs);
  font-weight: var(--weight-medium);
}

.topbar__copy h1 {
  overflow: hidden;
  color: var(--color-ink);
  font-size: var(--font-base);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.app-content {
  min-height: calc(100dvh - var(--topbar-height));
}

.screen {
  display: none;
  padding: var(--space-4) var(--space-4)
    calc(104px + env(safe-area-inset-bottom, 0px));
}

.screen.active {
  display: block;
}

.bottom-nav {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: var(--z-nav);
  width: 100%;
  max-width: 430px;
  min-height: calc(var(--nav-height) + env(safe-area-inset-bottom, 0px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: start;
  padding: 7px 8px calc(8px + env(safe-area-inset-bottom, 0px));
  background: var(--color-nav);
  border-top: 1px solid var(--color-line);
  box-shadow: var(--shadow-nav);
  backdrop-filter: blur(18px);
}

@media (min-width: 700px) {
  .device-stage {
    display: grid;
    place-items: center;
    padding: 24px;
  }

  .app-shell {
    height: min(860px, calc(100dvh - 48px));
    min-height: 0;
    border: 1px solid var(--color-device-border);
    border-radius: 28px;
    box-shadow: 0 24px 70px rgba(35, 35, 35, 0.12);
  }

  .app-content {
    min-height: calc(860px - var(--topbar-height));
  }

  .bottom-nav {
    bottom: 24px;
    border-radius: 0 0 28px 28px;
  }
}