/* Skeleton Loading Component — UI Comprehensive Refactor
 * Requires: tokens.css
 * Uses GPU-only animation (background-position) for 60fps pulse.
 *
 * Usage:
 *   <div class="skeleton skeleton--text"></div>
 *   <div class="skeleton skeleton--card"></div>
 *   <div class="skeleton skeleton--avatar"></div>
 *   <div class="skeleton skeleton--row"></div>
 */

/* ── Base ──────────────────────────────────────────────────────────────── */
.skeleton {
  border-radius: var(--radius-base);
  background: linear-gradient(
    90deg,
    var(--surface-card)  0%,
    var(--surface-hover) 50%,
    var(--surface-card)  100%
  );
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s linear infinite;
}

@keyframes skeleton-pulse {
  0%   { background-position: 200% center; }
  100% { background-position: -200% center; }
}

/* ── Text variants ─────────────────────────────────────────────────────── */
.skeleton--text {
  height: 14px;
  margin: 4px 0;
  border-radius: var(--radius-xs);
}

.skeleton--text-lg {
  height: 18px;
  margin: 4px 0;
  border-radius: var(--radius-xs);
}

.skeleton--text-xl {
  height: 24px;    /* KPI values */
  margin: 4px 0;
  border-radius: var(--radius-xs);
}

/* ── Block variants ────────────────────────────────────────────────────── */
.skeleton--card {
  height: 80px;
  border-radius: var(--radius-md);
}

.skeleton--row {
  height: 56px;    /* table rows */
  border-radius: var(--radius-xs);
}

/* ── Avatar ────────────────────────────────────────────────────────────── */
.skeleton--avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* ── Reduced motion ────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .skeleton { animation: none; }
}