/* rails.css — layout and chrome for on-rails demos. Colors come from fancysauce.css. */

html, body { height: 100%; }
body {
  margin: 0;
  background: hsl(var(--stage));
  color: hsl(var(--foreground));
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

[data-rails] {
  min-height: 100%;
  box-sizing: border-box;
  padding-inline: max(16px, 3vw);
  padding-block: 28px 96px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  cursor: default;
}

.rails-step { display: none; }
.rails-step.is-active {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(0, 2.1fr);
  gap: clamp(20px, 3.5vw, 56px);
  align-items: center;
  max-width: 1320px;
  width: 100%;
  margin-inline: auto;
  animation: rails-in 260ms ease-out;
}
.rails-step.is-full.is-active { grid-template-columns: minmax(0, 1fr); max-width: 1080px; align-content: center; gap: 24px; }

@keyframes rails-in {
  from { opacity: 0.4; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.rails-caption { display: grid; gap: 14px; align-content: center; }
.rails-caption > * { margin: 0; }
.rails-eyebrow {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: hsl(var(--primary-strong));
}
.rails-caption h1, .rails-caption h2 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.015em;
  text-wrap: balance;
  line-height: 1.1;
}
.rails-caption h1 { font-size: clamp(34px, 4.6vw, 60px); }
.rails-caption h2 { font-size: clamp(24px, 2.6vw, 34px); }
.rails-caption p { color: hsl(var(--muted-foreground)); max-width: 46ch; text-wrap: pretty; }
.rails-caption ul { margin: 0; padding-left: 1.1em; color: hsl(var(--muted-foreground)); display: grid; gap: 6px; }
.rails-caption strong { color: hsl(var(--foreground)); }

.rails-scene { min-width: 0; }

/* State reveal: [data-from] elements are dimmed-out until their state. */
[data-from] { transition: opacity 240ms ease, transform 240ms ease; }
[data-from]:not(.is-on) { opacity: 0; transform: translateY(4px); pointer-events: none; }
/* .is-swap: take no space while off, so two states can share one spot. */
[data-from].is-swap:not(.is-on) { display: none; }

/* --- navigation bar ------------------------------------------------------ */
.rails-bar {
  position: fixed;
  left: 50%;
  bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  width: min(720px, calc(100% - 32px));
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 8px;
  border-radius: 999px;
  background: hsl(var(--card) / 0.92);
  border: 1px solid hsl(var(--border));
  box-shadow: 0 6px 24px hsl(var(--shadow) / 0.12);
  backdrop-filter: blur(8px);
  z-index: 20;
}
.rails-btn {
  flex: none;
  font: 600 13px/1 var(--font-sans);
  color: hsl(var(--foreground));
  background: transparent;
  border: 1px solid hsl(var(--border));
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
}
.rails-btn:hover { background: hsl(var(--muted)); }
.rails-next { background: hsl(var(--primary)); border-color: hsl(var(--primary)); color: hsl(var(--primary-foreground)); }
.rails-next:hover { background: hsl(var(--primary) / 0.88); }
.rails-btn:focus-visible, .rails-seg:focus-visible { outline: 2px solid hsl(var(--ring)); outline-offset: 2px; }

.rails-track { flex: 1; display: flex; gap: 4px; min-width: 0; }
.rails-seg {
  flex: 1;
  height: 16px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  position: relative;
}
.rails-seg::after {
  content: "";
  position: absolute;
  inset: 6px 0;
  border-radius: 2px;
  background: hsl(var(--border));
}
.rails-seg.is-done::after { background: hsl(var(--primary) / 0.45); }
.rails-seg.is-current::after { background: hsl(var(--primary)); }
.rails-count {
  flex: none;
  font: 600 12px/1 var(--font-sans);
  color: hsl(var(--muted-foreground));
  font-variant-numeric: tabular-nums;
  white-space: pre;
}

@media (max-width: 900px) {
  .rails-step.is-active { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .rails-caption p { max-width: none; }
  [data-rails] { padding-block: 20px 96px; }
}
@media (max-width: 520px) {
  .rails-count { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .rails-step.is-active { animation: none; }
  [data-from] { transition: none; }
}