/* ===========================================================================
   loader.css — .lnet processing showcase. Skeleton of the stage plus a
   parse-pipeline readout and igniting resource nodes. Shown only between drop
   and render; reduced-motion skips it entirely (committed in JS).
   =========================================================================== */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Skeleton primitive ---- */
.skel {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-sm);
  background: var(--bg-2);
}
.skel::after {
  content: '';
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, oklch(1 0 0 / 0.05), transparent);
  animation: shimmer 1.3s var(--ease-out-quart) infinite;
}
@keyframes shimmer { to { transform: translateX(100%); } }

/* ---- Status bar skeleton (reuses .vis__bar shell) ---- */
.skel--file  { width: 200px; height: 16px; }
.skel--stats { width: 220px; height: 12px; }
.skel--btn   { width: 96px;  height: 30px; border-radius: var(--r-md); }

/* ---- Graph skeleton ---- */
.load-graph {
  position: relative;
  display: grid;
  place-items: center;
}
.load-graph__scan {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  border-radius: var(--r-lg);
}
.load-graph__scan::before {
  content: '';
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 40%;
  background: linear-gradient(180deg, transparent, var(--accent-wash) 70%, oklch(0.82 0.15 195 / 0.22));
  transform: translateY(-120%);
  animation: load-scan 1.6s var(--ease-out-quint) infinite;
}
@keyframes load-scan {
  0%   { transform: translateY(-120%); }
  100% { transform: translateY(300%); }
}

.load-graph__nodes {
  position: absolute;
  inset: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}
.load-node {
  position: absolute;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--c);
  box-shadow: 0 0 16px var(--c);
  opacity: 0;
  transform: scale(0.5);
  animation: node-ignite 1.5s var(--ease-out-quart) infinite;
  animation-delay: var(--d);
}
.load-node--0 { left: 24%; top: 34%; }
.load-node--1 { left: 62%; top: 26%; }
.load-node--2 { left: 72%; top: 60%; }
.load-node--3 { left: 36%; top: 66%; }
.load-node--4 { left: 50%; top: 46%; width: 18px; height: 18px; }
@keyframes node-ignite {
  0%, 100% { opacity: 0.14; transform: scale(0.5); }
  45%      { opacity: 1;    transform: scale(1); }
}

/* ---- Pipeline readout (focal) ---- */
.load-steps {
  position: relative;
  z-index: 2;
  width: min(330px, 82%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--space-5);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background: oklch(0.145 0.02 250 / 0.72);
  backdrop-filter: blur(8px);
}
.load-step {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--text-sm);
  color: var(--fg-faint);
  transition: color 0.2s var(--ease-out-quart);
}
.load-step.is-active { color: var(--fg-dim); }
.load-step.is-done   { color: var(--fg); }
.load-step__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--line);
  transition: background 0.2s var(--ease-out-quart), box-shadow 0.2s var(--ease-out-quart);
}
.load-step.is-active .load-step__dot {
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse-dot 0.8s ease-in-out infinite;
}
.load-step.is-done .load-step__dot {
  background: var(--type-chemical);
  box-shadow: 0 0 8px var(--type-chemical);
}
.load-step__k { flex: 1; }
.load-step__v {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

.load-progress {
  margin-top: 6px;
  height: 3px;
  border-radius: 2px;
  background: var(--bg-3);
  overflow: hidden;
}
.load-progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform-origin: left;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--accent), var(--type-chemical));
  transition: transform 0.25s var(--ease-out-quart);
}

/* ---- Detail panel skeleton ---- */
.detail--skel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.skel--line  { height: 14px; }
.skel--line.w70 { width: 70%; }
.skel--line.w40 { width: 40%; }
.skel--chip  { width: 120px; height: 22px; border-radius: 20px; }
.skel--block { height: 64px; border-radius: var(--r-sm); }

@media (prefers-reduced-motion: reduce) {
  .skel::after,
  .load-graph__scan::before,
  .load-node,
  .load-step.is-active .load-step__dot { animation: none; }
}