:root {
  /* ── Elevation Scale ── */
  --shadow-none:  none;
  --shadow-xs:    0 1px 2px rgba(28, 25, 23, 0.05);
  --shadow-sm:    0 1px 3px rgba(28, 25, 23, 0.08), 0 1px 2px rgba(28, 25, 23, 0.04);
  --shadow-md:    0 4px 6px rgba(28, 25, 23, 0.07), 0 2px 4px rgba(28, 25, 23, 0.04);
  --shadow-lg:    0 10px 15px rgba(28, 25, 23, 0.08), 0 4px 6px rgba(28, 25, 23, 0.04);
  --shadow-xl:    0 20px 25px rgba(28, 25, 23, 0.08), 0 10px 10px rgba(28, 25, 23, 0.03);
  --shadow-inner: inset 0 2px 4px rgba(28, 25, 23, 0.06);

  /* ── Focus Rings ── */
  --shadow-focus:       0 0 0 3px rgba(67, 56, 202, 0.2);
  --shadow-focus-error: 0 0 0 3px rgba(220, 38, 38, 0.2);

  /* ── Semantic Aliases ── */
  --shadow-card:       var(--shadow-sm);
  --shadow-card-hover: var(--shadow-md);
  --shadow-dropdown:   var(--shadow-lg);
  --shadow-modal:      var(--shadow-xl);
  --shadow-popover:    var(--shadow-lg);
}