/* ==========================================================================
   OgbonMath — Unified Empty States
   --------------------------------------------------------------------------
   Empty-state pattern for: bookmarks, notes, review queue, progress,
   search, and any future "no data yet" surface. Warm paper card with
   a calm glyph, short encouraging copy, and a CTA that points somewhere.
   ========================================================================== */

.empty-state {
  display: flex !important;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center !important;
  max-width: 460px;
  margin: var(--sp-8) auto !important;
  padding: var(--sp-10) var(--sp-6) !important;
  background: var(--bg2);
  border: 1px solid var(--bdr);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xs);
  gap: var(--sp-3);
  color: var(--tx) !important;  /* defeat the inline var(--tx3) */
}

.empty-state-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px !important;
  height: 72px !important;
  margin: 0 auto !important;
  border-radius: var(--radius-full);
  background: var(--ac-soft);
  border: 1px solid var(--ac);
  color: var(--ac);
  font-size: 32px !important;
  font-family: var(--font-sans);
  font-weight: var(--fw-regular);
  line-height: 1;
  margin-bottom: var(--sp-1) !important;
}

.empty-state-title {
  font-family: var(--font-display) !important;
  font-size: var(--fs-xl) !important;
  font-weight: var(--fw-semibold) !important;
  letter-spacing: var(--ls-tight) !important;
  line-height: var(--lh-snug) !important;
  color: var(--tx) !important;
  margin: 0 !important;
}

.empty-state-sub {
  font-family: var(--font-serif) !important;
  font-size: var(--fs-base) !important;
  line-height: var(--lh-relaxed) !important;
  color: var(--tx1) !important;
  max-width: 38ch;
  margin: 0 auto !important;
  font-weight: var(--fw-regular) !important;
}

.empty-state-cta {
  margin-top: var(--sp-4);
  padding: 10px 22px;
  background: var(--ac);
  color: var(--ac-tx);
  border: 1px solid var(--ac);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.empty-state-cta:hover {
  background: var(--ac2);
  border-color: var(--ac2);
  color: var(--ac-tx);
}

.empty-state-cta:active {
  transform: scale(var(--active-scale));
}

/* ==========================================================================
   Secondary CTA variant — ghost button when there are two actions
   ==========================================================================
*/
.empty-state-cta-secondary {
  background: transparent;
  color: var(--tx1);
  border: 1px solid var(--bdr);
}

.empty-state-cta-secondary:hover {
  background: var(--hover-bg);
  color: var(--tx);
  border-color: var(--bdr2);
}

/* ==========================================================================
   Mobile
   ==========================================================================
*/
@media (max-width: 560px) {
  .empty-state {
    margin: var(--sp-6) var(--sp-3) !important;
    padding: var(--sp-8) var(--sp-4) !important;
  }
  .empty-state-title {
    font-size: var(--fs-lg) !important;
  }
  .empty-state-icon {
    width: 60px !important;
    height: 60px !important;
    font-size: 26px !important;
  }
}