/* R3 slice 8/14 (35-skeletons.css) — extracted VERBATIM from styles.css lines 5049-5174.
   skeleton loaders (shapes, containers, responsive), .empty state.
   Link order in index.html is load-bearing: cascade tie-breaks depend on it. Do not reorder. */

/* ===================================================================
   Skeleton loaders (PR-2). Pure presentational shapes — no semantics.
   Compose these via window.Skeletons factories (frontend/src/skeletons.js).
   =================================================================== */

.skel {
  display: block;
  background: var(--surface-2);
  border-radius: 12px;
  position: relative;
  overflow: hidden;
}

.skel::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    transparent 20%,
    rgba(255, 255, 255, .55) 50%,
    transparent 80%
  );
  transform: translateX(-100%);
  animation: skel-shimmer 1.4s cubic-bezier(.4, .0, .2, 1) infinite;
}

body.dark .skel::after {
  background: linear-gradient(
    100deg,
    transparent 20%,
    rgba(255, 255, 255, .06) 50%,
    transparent 80%
  );
}

@keyframes skel-shimmer {
  100% { transform: translateX(100%); }
}

@media (prefers-reduced-motion: reduce) {
  .skel::after { animation: none; }
}

/* Shape variants */
.skel-line     { height: 14px; border-radius: 7px; }
.skel-line-sm  { height: 10px; border-radius: 5px; }
.skel-line-lg  { height: 24px; border-radius: 8px; }
.skel-circle   { border-radius: 50%; }
.skel-rect     { border-radius: 20px; }
.skel-bar      { height: 11px; border-radius: 6px; }
.skel-pill     { height: 22px; border-radius: 999px; }

/* Containers (no shimmer themselves — they hold shaped .skel children) */
.skel-page {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 0 40px 40px;
}

.skel-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.skel-row  { display: flex; gap: 18px; }
.skel-col  { display: flex; flex-direction: column; gap: 12px; flex: 1; }
.skel-grid { display: grid; gap: 18px; }
.skel-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.skel-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.skel-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 900px) {
  .skel-page { padding: 0 16px 40px; }
  .skel-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .skel-grid.cols-3 { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .skel-grid.cols-4,
  .skel-grid.cols-2 { grid-template-columns: 1fr; }

  /* Confirmation-mix donut: stack legend under the donut so the percent
     column never clips on narrow phones. */
  .mix-donut-wrap {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .mix-legend { width: 100%; }
}

/* Card-bodied skeletons share the .card chrome from foundations */
.skel-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
  padding: 26px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 120px;
}

.skel-stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 140px;
}

.empty {
  padding: 24px;
  color: var(--muted);
  text-align: center;
}