/* ==========================================================================
   FROZEN WORKS — Utilities
   ========================================================================== */

.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;
}

.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }
.stack { display: flex; flex-direction: column; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }

.section-head { max-width: 640px; margin-bottom: var(--space-xl); }
.section-head.text-center { margin-inline: auto; }
.section-head h2 { margin-top: 0.5rem; }

/* ---- Scroll reveal ----
   Compositor-friendly only: opacity + transform. JS toggles [data-revealed]. */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
  will-change: opacity, transform;
}
[data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: translateY(0);
  will-change: auto;
}
[data-reveal-group] > * { transition-delay: calc(var(--reveal-index, 0) * 70ms); }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

.divider { height: 1px; background: var(--color-border); border: none; margin-block: var(--space-lg); }

@media print {
  .site-header, .site-footer, .cookie-banner, .back-to-top, .nav-toggle { display: none !important; }
}