/* Mobile-first portrait layout. Each "screen" is a full-height column with
   a scrollable body and a sticky bottom dock for the primary CTA. */

.app-loading {
  display: grid;
  place-items: center;
  min-height: 100dvh;
  background: var(--page);
}

.boot {
  display: grid;
  gap: var(--s-2);
  text-align: center;
}

.boot-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 1.26px;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

#app {
  background: var(--canvas);
}

/* ---------- Screen shell ---------- */
.screen {
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  background: var(--canvas);
}

.screen-header {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: max(var(--s-3), env(safe-area-inset-top)) var(--s-5) var(--s-3);
  background: var(--canvas);
  position: sticky;
  top: 0;
  z-index: 4;
}

.header-back {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-primary);
}

.header-back:active { background: var(--surface-3); }

.header-progress {
  flex: 1;
  display: flex;
  justify-content: center;
  gap: 6px;
}

.header-progress-dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--surface-2);
  transition: background 200ms ease, transform 200ms ease;
}

.header-progress-dot.is-done { background: var(--accent); }
.header-progress-dot.is-active {
  background: var(--accent);
  transform: scale(1.4);
}

.header-skip {
  height: 40px;
  padding: 0 var(--s-3);
  border: 0;
  background: transparent;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.07px;
  border-radius: var(--r-md);
}

.header-skip:active { background: var(--surface-2); }

/* ---------- Body ---------- */
.screen-body {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--s-3) var(--s-5) var(--s-7);
  display: grid;
  gap: var(--s-5);
  align-content: start;
}

.screen-headline {
  display: grid;
  gap: var(--s-2);
  margin: var(--s-3) 0 var(--s-2);
}

.screen-eyebrow {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 1.26px;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.screen-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(28px, 7vw, 36px);
  line-height: 1.08;
  font-weight: 400;
  letter-spacing: -0.95px;
  color: var(--text-primary);
}

.screen-sub {
  font-size: 15px;
  line-height: 22px;
  color: var(--text-secondary);
  max-width: 38ch;
}

/* ---------- Sticky bottom dock ---------- */
.screen-dock {
  display: grid;
  gap: var(--s-2);
  padding: var(--s-4) var(--s-5) max(var(--s-5), env(safe-area-inset-bottom));
  background: var(--canvas);
  border-top: 1px solid var(--border-subtle);
  position: sticky;
  bottom: 0;
  z-index: 5;
}

/* Hide the dock divider when the body fits without scroll (visual cleanliness) */
.screen-dock.is-flush {
  border-top: 0;
}