/*
 * Canvas Empty Stage — overlay rendered when the active page has no sections.
 * Mounted as a sibling of the iframe inside .pb-iframe-wrap, mirroring the
 * GlassOverlay positioning pattern. See builder/scripts/ui/canvas-empty-stage.js.
 */

/* ── Stage container ────────────────────────────────────────────────── */

.pb-stage {
  position: absolute;
  inset: 0;
  z-index: 100;
  pointer-events: auto;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--pb-radius-chip);
  color: var(--pb-text);
  font-family: inherit;

  /* Cursor spotlight position (rAF-throttled writes from JS).
     Default 50% so the spotlight has a sensible resting position. */
  --pb-stage-mx: 50%;
  --pb-stage-my: 35%;
}

.pb-stage[hidden] {
  display: none;
}

/* ── Background layers ──────────────────────────────────────────────── */

/* Soft canvas-y background that reads as "page builder, not error state". */
.pb-stage-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(120% 60% at 50% 0%, var(--pb-accent-muted, rgba(0, 120, 212, 0.06)) 0%, transparent 60%),
    linear-gradient(180deg, var(--pb-surface) 0%, var(--pb-bg) 100%);
}

/* Dot grid — rendered with two stacked radial-gradients on a single layer.
   Static, ~22px spacing, very subtle. */
.pb-stage-dotgrid {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, var(--pb-border) 1px, transparent 0);
  background-size: 22px 22px;
  background-position: 0 0;
  opacity: 0.55;
  mask-image: radial-gradient(circle 60% at 50% 45%, #000 35%, transparent 95%);
  -webkit-mask-image: radial-gradient(circle 60% at 50% 45%, #000 35%, transparent 95%);
}

/* Cursor-aware spotlight — single layer, GPU-cheap, no filter:blur. */
.pb-stage-spotlight {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image: radial-gradient(
    circle 280px at var(--pb-stage-mx) var(--pb-stage-my),
    rgba(0, 120, 212, 0.13) 0%,
    rgba(0, 120, 212, 0.05) 40%,
    transparent 70%
  );
  transition: opacity 240ms var(--pb-transition);
  will-change: transform, opacity;
}

/* ── Content column (centered) ──────────────────────────────────────── */

.pb-stage-content {
  position: relative;
  z-index: 3;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--pb-space-8);
  padding: var(--pb-space-10) var(--pb-space-6);
  text-align: center;
}

/* ── Wireframe page silhouette ──────────────────────────────────────── */

.pb-stage-wire {
  position: relative;
  width: min(360px, 70%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.pb-stage-wire-block {
  display: block;
  width: 100%;
  border-radius: var(--pb-radius-md);
  background: var(--pb-surface);
  border: 1px solid var(--pb-border);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.pb-stage-wire-nav      { height: 14px; width: 88%; }
.pb-stage-wire-hero     {
  height: 110px;
  background:
    linear-gradient(180deg, var(--pb-accent-muted, rgba(0, 120, 212, 0.08)) 0%, transparent 22%),
    var(--pb-surface);
}
.pb-stage-wire-content  { height: 28px; width: 96%; }
.pb-stage-wire-footer   { height: 18px; width: 64%; }

/* ── Headline + subtitle ───────────────────────────────────────────── */

.pb-stage-greeting {
  display: flex;
  flex-direction: column;
  gap: var(--pb-space-3);
  align-items: center;
}

.pb-stage-headline {
  font-size: var(--pb-font-4xl);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--pb-text-bright);
  line-height: 1.15;
  margin: 0;
}

.pb-stage-subtitle {
  font-size: var(--pb-font-md);
  color: var(--pb-text-dim);
  margin: 0;
  max-width: 56ch;
  line-height: 1.5;
}

.pb-stage-subtitle strong {
  color: var(--pb-text);
  font-weight: 600;
}

/* ── Door row ──────────────────────────────────────────────────────── */

.pb-stage-doors {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 240px));
  gap: var(--pb-space-6);
  width: 100%;
  max-width: 820px;
  align-items: stretch;
}

.pb-stage-door {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--pb-space-4);
  padding: var(--pb-space-6);
  background: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: var(--pb-radius-lg);
  color: var(--pb-text);
  font-family: inherit;
  font-size: inherit;
  text-align: left;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.04);
  transition:
    transform var(--pb-transition-spring),
    border-color var(--pb-transition),
    box-shadow var(--pb-transition);
  overflow: hidden;
  isolation: isolate;
}

.pb-stage-door:hover,
.pb-stage-door:focus-visible {
  transform: translateY(-4px);
  border-color: var(--pb-accent);
  box-shadow:
    0 1px 3px rgba(15, 23, 42, 0.06),
    0 18px 36px rgba(0, 120, 212, 0.18),
    0 0 0 1px var(--pb-accent-glow, rgba(0, 120, 212, 0.18));
  outline: none;
}

.pb-stage-door:active {
  transform: translateY(-1px);
}

/* Door icon area — visual hint of what each door does */

.pb-stage-door-art {
  position: relative;
  height: 88px;
  border-radius: var(--pb-radius-md);
  background: linear-gradient(180deg, var(--pb-bg) 0%, var(--pb-surface) 100%);
  border: 1px dashed var(--pb-border);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Door 1 — three stacked mini-thumbnails. Fan on hover. */

.pb-stage-door-art-stack {
  position: relative;
  width: 70%;
  height: 60%;
}

.pb-stage-door-art-stack > span {
  position: absolute;
  inset: 0;
  background: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: var(--pb-radius-sm);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.06);
  transition: transform var(--pb-transition-spring);
  transform-origin: 50% 100%;
}
.pb-stage-door-art-stack > span:nth-child(1) { transform: translate(-6px, 4px) rotate(-3deg); }
.pb-stage-door-art-stack > span:nth-child(2) { transform: translate(0,    0)   rotate(0);    z-index: 2; }
.pb-stage-door-art-stack > span:nth-child(3) { transform: translate(6px,  4px) rotate(3deg); }

.pb-stage-door-art-stack > span::after {
  content: '';
  position: absolute;
  left: 10%;
  right: 60%;
  top: 18%;
  height: 4px;
  border-radius: 2px;
  background: var(--pb-accent-muted, rgba(0, 120, 212, 0.18));
}

.pb-stage-door:hover .pb-stage-door-art-stack > span:nth-child(1) { transform: translate(-22px, 2px) rotate(-9deg); }
.pb-stage-door:hover .pb-stage-door-art-stack > span:nth-child(3) { transform: translate(22px,  2px) rotate(9deg); }

/* Door 2 — three stacked horizontal cards. Slight shuffle on hover. */

.pb-stage-door-art-deck {
  position: relative;
  width: 70%;
  height: 60%;
}

.pb-stage-door-art-deck > span {
  position: absolute;
  left: 0;
  right: 0;
  height: 28%;
  background: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: var(--pb-radius-sm);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.05);
  transition: transform var(--pb-transition-spring);
}
.pb-stage-door-art-deck > span:nth-child(1) { top: 0;   transform: translateX(0); }
.pb-stage-door-art-deck > span:nth-child(2) { top: 36%; transform: translateX(0); }
.pb-stage-door-art-deck > span:nth-child(3) { top: 72%; transform: translateX(0); }

.pb-stage-door:hover .pb-stage-door-art-deck > span:nth-child(1) { transform: translateX(8px); }
.pb-stage-door:hover .pb-stage-door-art-deck > span:nth-child(3) { transform: translateX(-8px); }

/* Door 3 — URL line (rendered as a real <input>, see HTML).
   The art container inherits .pb-stage-door-art (full width, 88px height,
   dashed border, flex-centering) so Door 3 lines up vertically with Doors 1 & 2.
   The input is sized smaller and centered within. */

.pb-stage-door-art-url {
  position: relative;
}

.pb-stage-door-url-input {
  width: 84%;
  box-sizing: border-box;
  padding: var(--pb-space-3) var(--pb-space-4);
  background: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: var(--pb-radius-md);
  color: var(--pb-text-bright);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: var(--pb-font-md);
  letter-spacing: 0.01em;
  text-align: center;
  transition: border-color var(--pb-transition), box-shadow var(--pb-transition);
}

.pb-stage-door-url-input::placeholder {
  color: var(--pb-text-dim);
  opacity: 0.7;
}

.pb-stage-door-url-input:focus {
  outline: none;
  border-color: var(--pb-accent);
  box-shadow: 0 0 0 3px var(--pb-accent-glow, rgba(0, 120, 212, 0.18));
}

/* Door label area */

.pb-stage-door-body {
  display: flex;
  flex-direction: column;
  gap: var(--pb-space-2);
}

.pb-stage-door-title {
  display: flex;
  align-items: center;
  gap: var(--pb-space-3);
  font-size: var(--pb-font-lg);
  font-weight: 600;
  color: var(--pb-text-bright);
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.pb-stage-door-desc {
  font-size: var(--pb-font-sm);
  color: var(--pb-text-dim);
  line-height: 1.45;
  margin: 0;
}

/* Keyboard hint badge (1 / 2 / 3) */

.pb-stage-door-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border-radius: var(--pb-radius-sm);
  background: var(--pb-bg);
  border: 1px solid var(--pb-border);
  color: var(--pb-text-dim);
  font-size: var(--pb-font-sm);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  transition: opacity var(--pb-transition);
}

.pb-stage.pb-stage-badges-dismissed .pb-stage-door-badge {
  opacity: 0;
}

/* ── Tip ticker ─────────────────────────────────────────────────────── */

.pb-stage-ticker {
  font-size: var(--pb-font-sm);
  color: var(--pb-text-dim);
  letter-spacing: 0.005em;
  min-height: 1.2em;
  display: flex;
  align-items: center;
  gap: var(--pb-space-3);
}

.pb-stage-ticker-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
}

.pb-stage-ticker-text {
  transition: opacity 320ms ease;
}

.pb-stage-ticker-text.pb-stage-ticker-out {
  opacity: 0;
}

/* ── Cinematic intro (one-shot, gated by .pb-stage-intro) ───────────────
 * The JS adds .pb-stage-intro to the stage element on the first-ever show
 * and runs Element.animate() on each labelled child below. While the class
 * is present, the elements start in their "hidden" state; the WAAPI
 * animations drive them to visible. The class is removed when the intro
 * resolves, after which the natural CSS resting state (opacity:1) applies.
 *
 * For users without intro replay (subsequent loads, page switches, etc.)
 * the class is never added — elements show in resting state immediately.
 */

.pb-stage.pb-stage-intro .pb-stage-wire-block {
  opacity: 0;
  transform: scaleX(0);
}

.pb-stage.pb-stage-intro .pb-stage-greeting {
  opacity: 0;
  transform: translateY(8px);
}

.pb-stage.pb-stage-intro .pb-stage-door {
  opacity: 0;
  transform: translateY(14px) scale(0.96);
}

.pb-stage.pb-stage-intro .pb-stage-door-badge {
  opacity: 0;
}

.pb-stage.pb-stage-intro .pb-stage-ticker {
  opacity: 0;
}

/* ── Compact (small canvas) ─────────────────────────────────────────── */

@media (max-width: 760px) {
  .pb-stage-content   { gap: var(--pb-space-6); padding: var(--pb-space-6) var(--pb-space-4); }
  .pb-stage-wire      { display: none; }
  .pb-stage-doors     { grid-template-columns: 1fr; max-width: 320px; gap: var(--pb-space-4); }
  .pb-stage-door      { padding: var(--pb-space-4); }
  .pb-stage-door-art  { height: 64px; }
  .pb-stage-headline  { font-size: var(--pb-font-3xl); }
}

@media (max-height: 620px) {
  .pb-stage-wire      { display: none; }
  .pb-stage-content   { gap: var(--pb-space-5); }
  .pb-stage-headline  { font-size: var(--pb-font-3xl); }
}

/* ── Reduced motion ────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .pb-stage-door,
  .pb-stage-door-art-stack > span,
  .pb-stage-door-art-deck > span,
  .pb-stage-door-url-input,
  .pb-stage-spotlight,
  .pb-stage-ticker-text {
    transition: none;
  }
  .pb-stage-door:hover,
  .pb-stage-door:focus-visible {
    transform: none;
  }
  .pb-stage-door:hover .pb-stage-door-art-stack > span,
  .pb-stage-door:hover .pb-stage-door-art-deck > span {
    transform: none;
  }
  .pb-stage-spotlight {
    background-image: none;
  }
}