/* Layout system */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: var(--space-4) var(--space-4) var(--space-8);
}

.app__header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-4) var(--space-6);
  text-align: center;
}

.app__brand {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 8vw, var(--text-4xl));
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1;
}

.app__tagline {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.app__main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: stretch;
}

.app__footer {
  margin-top: auto;
  padding-top: var(--space-8);
  text-align: center;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.screen {
  display: none;
  flex-direction: column;
  gap: var(--space-6);
  animation: screen-in var(--duration-base) var(--ease-out) both;
}

.screen.is-active {
  display: flex;
}

@keyframes screen-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 640px) {
  .app {
    padding: var(--space-8) var(--space-6) var(--space-12);
  }
}