/**
 * loading-states.css — Viewport spinners, BIM skeleton screens, simulation
 * progress bars, .rvt import progress, save indicator pill.
 * Does NOT own: app-loading-overlay (inline in app.html), Three.js canvas.
 */

/* ── Skeleton pulse animation ──────────────────────────────────────────────── */
@keyframes atl-skeleton-pulse {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

@keyframes atl-spin {
  to { transform: rotate(360deg); }
}

@keyframes atl-saved-in {
  from { opacity: 0; transform: translateY(-6px) scale(0.92); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}

@keyframes atl-saved-out {
  from { opacity: 1; transform: translateY(0)   scale(1); }
  to   { opacity: 0; transform: translateY(-6px) scale(0.92); }
}

@keyframes atl-progress-indeterminate {
  0%   { left: -40%; width: 40%; }
  60%  { left: 100%; width: 40%; }
  100% { left: 100%; width: 40%; }
}

/* ── Viewport init spinner ─────────────────────────────────────────────────── */
.vp-spinner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--bg-viewport, #0d1117);
  z-index: 20;
  pointer-events: none;
  /* crossfade out in <100ms when scene is ready */
  transition: opacity 80ms ease, visibility 80ms ease;
}

.vp-spinner.vp-spinner--gone {
  opacity: 0;
  visibility: hidden;
}

.vp-spinner__ring {
  width: 28px;
  height: 28px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-top-color: rgba(255, 255, 255, 0.55);
  border-radius: 50%;
}

.vp-spinner__label {
  font-size: 10px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.04em;
  font-family: 'DM Mono', monospace, sans-serif;
}

/* Animate ring unless user prefers reduced motion */
@media (prefers-reduced-motion: no-preference) {
  .vp-spinner__ring {
    animation: atl-spin 0.9s linear infinite;
  }
}

/* ── BIM model skeleton screens ────────────────────────────────────────────── */
.atl-skeleton {
  background: linear-gradient(
    90deg,
    rgba(255,255,255,0.04) 25%,
    rgba(255,255,255,0.09) 50%,
    rgba(255,255,255,0.04) 75%
  );
  background-size: 400px 100%;
  border-radius: 4px;
}

@media (prefers-reduced-motion: no-preference) {
  .atl-skeleton {
    animation: atl-skeleton-pulse 1.4s ease-in-out infinite;
  }
}

/* Skeleton wrapper overlay — covers panel until real content is ready */
.atl-skeleton-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-panel, #10151d);
  transition: opacity 200ms ease, visibility 200ms ease;
  pointer-events: none;
}

.atl-skeleton-overlay.atl-skeleton-overlay--gone {
  opacity: 0;
  visibility: hidden;
}

/* Pre-shaped skeleton blocks for project tree */
.atl-skel-tree-row {
  height: 20px;
  border-radius: 4px;
}
.atl-skel-tree-row--indent {
  margin-left: 20px;
  width: calc(100% - 20px);
}

/* Properties panel skeleton — label + value pairs */
.atl-skel-prop {
  display: flex;
  gap: 8px;
  align-items: center;
}
.atl-skel-prop__label {
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
}
.atl-skel-prop__value {
  height: 14px;
  border-radius: 3px;
  flex: 1;
}

/* Viewport skeleton — dark fill with subtle rule marks */
.atl-skel-viewport {
  position: absolute;
  inset: 0;
  z-index: 10;
  background: var(--bg-viewport, #0d1117);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: opacity 200ms ease, visibility 200ms ease;
  pointer-events: none;
}

.atl-skel-viewport.atl-skel-viewport--gone {
  opacity: 0;
  visibility: hidden;
}

/* ── Simulation / analysis progress bar ────────────────────────────────────── */
.atl-sim-progress {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: min(460px, calc(100vw - 48px));
  background: var(--bg-panel, #10151d);
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 10px;
  padding: 14px 18px;
  z-index: 2000;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  /* Slide up on open */
  animation: atl-saved-in 0.2s ease both;
}

.atl-sim-progress.atl-sim-progress--hidden {
  display: none;
}

.atl-sim-progress__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.atl-sim-progress__title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text, #e0e4ea);
  letter-spacing: 0.02em;
}

.atl-sim-progress__elapsed {
  font-size: 11px;
  color: var(--text-muted, rgba(255,255,255,0.4));
  font-family: 'DM Mono', monospace;
  letter-spacing: 0.04em;
}

.atl-sim-progress__track {
  position: relative;
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 8px;
}

.atl-sim-progress__fill {
  height: 100%;
  background: #3479c4;
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* Indeterminate bar (no real percent) */
.atl-sim-progress__fill--indeterminate {
  width: 40% !important;
  position: absolute;
  left: -40%;
  background: linear-gradient(90deg, transparent, #3479c4, transparent);
}

@media (prefers-reduced-motion: no-preference) {
  .atl-sim-progress__fill--indeterminate {
    animation: atl-progress-indeterminate 1.6s ease-in-out infinite;
  }
}

.atl-sim-progress__stage {
  font-size: 11px;
  color: var(--text-muted, rgba(255,255,255,0.45));
  font-family: 'DM Mono', monospace;
  letter-spacing: 0.03em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Stage dots */
.atl-sim-progress__stages {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.atl-sim-progress__stage-dot {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  color: rgba(255,255,255,0.3);
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255,255,255,0.04);
}

.atl-sim-progress__stage-dot--active {
  color: #3479c4;
  background: rgba(52,121,196,0.15);
}

.atl-sim-progress__stage-dot--done {
  color: #4aad6e;
  background: rgba(74,173,110,0.12);
}

.atl-sim-progress__stage-dot::before {
  content: '○';
  font-size: 8px;
}
.atl-sim-progress__stage-dot--active::before { content: '◉'; }
.atl-sim-progress__stage-dot--done::before   { content: '✓'; font-size: 9px; }

/* ── Save indicator pill ───────────────────────────────────────────────────── */
#atl-save-pill {
  position: fixed;
  top: 12px;
  right: 16px;
  z-index: 3000;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  pointer-events: none;
  opacity: 0;
  transition: none;
}

#atl-save-pill.atl-save-pill--visible {
  opacity: 1;
  animation: atl-saved-in 0.18s ease both;
}

#atl-save-pill.atl-save-pill--fading {
  animation: atl-saved-out 0.3s ease both;
}

/* States */
#atl-save-pill[data-state="saved"] {
  background: rgba(74,173,110,0.18);
  border: 1px solid rgba(74,173,110,0.35);
  color: #4aad6e;
}

#atl-save-pill[data-state="retrying"] {
  background: rgba(220,160,60,0.18);
  border: 1px solid rgba(220,160,60,0.35);
  color: #dca03c;
}

#atl-save-pill[data-state="offline"] {
  background: rgba(220,80,60,0.18);
  border: 1px solid rgba(220,80,60,0.35);
  color: #e05040;
}

/* Pill icon dot */
#atl-save-pill::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

/* ── RVT import multi-stage ────────────────────────────────────────────────── */
#atl-rvt-progress {
  /* Re-uses .atl-sim-progress layout; unique ID for JS targeting */
}

/* ── prefers-reduced-motion: disable all animation, show static text ─────── */
@media (prefers-reduced-motion: reduce) {
  .vp-spinner__ring,
  .atl-skeleton,
  .atl-sim-progress__fill--indeterminate {
    animation: none !important;
  }

  .vp-spinner__label {
    /* Static fallback text already in DOM — no extra change needed */
  }
}