.lesson-item.active {
  background:
    linear-gradient(
      180deg,
      rgba(255,255,255,0.98),
      rgba(255,255,255,0.84)
    );

  color:
    rgba(15,23,42,0.98);

  transform:
    translateX(4px);

  border-color:
    rgba(255,225,68,0.92);

  box-shadow:
    0 18px 42px rgba(15,23,42,0.10),
    0 0 0 1px rgba(255,225,68,0.28),
    inset 0 1px 0 rgba(255,255,255,0.86);
}

.lesson-item.active::before {
  opacity: 1;
}

.lesson-item.completed {
  color:
    rgba(15,23,42,0.44);

  background:
    linear-gradient(
      180deg,
      rgba(255,255,255,0.58),
      rgba(255,255,255,0.38)
    );

  border-color:
    rgba(15,23,42,0.04);

  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.46);
}

.lesson-item.completed:hover {
  color:
    rgba(15,23,42,0.68);

  border-color:
    rgba(255,225,68,0.22);

  box-shadow:
    0 12px 30px rgba(15,23,42,0.07),
    0 0 0 1px rgba(255,225,68,0.08),
    inset 0 1px 0 rgba(255,255,255,0.62);
}

.lesson-item.completed span:last-child {
  color:
    rgba(15,23,42,0.68);

  font-weight:
    800;
}

.lesson-item.active span:last-child {
  font-weight:
    800;
}
/* =========================
COUNTER
========================= */

.counter-update {
  transform: scale(1.035);

  border-color:
    rgba(255,225,68,0.32);

  box-shadow:
    0 0 0 1px rgba(255,225,68,0.10),
    0 0 28px rgba(255,225,68,0.16),
    0 18px 42px rgba(0,0,0,0.34),
    inset 0 1px 0 rgba(255,255,255,0.08);

  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    box-shadow 0.16s ease;
}

.micro-help-btn.is-disabled,
.micro-help-btn:disabled {
  opacity: 0.28;
  filter: grayscale(1);
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
  transform: none;
}

.lesson-completion-action {
  text-align: center;
}

.lesson-completion-status {
  margin-top: 12px;
  color: rgba(255,255,255,0.78);
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  transform: translateY(3px);
  transition:
    opacity 0.18s ease,
    transform 0.18s ease;
}

.lesson-completion-status.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================
   MEMORY CARD HOVER
   subtle depth interaction for mini theory cards
========================= */

@media (hover: hover) and (pointer: fine) {
  .mini-theory-card {
    transition:
      transform 0.26s ease,
      box-shadow 0.26s ease,
      border-color 0.26s ease,
      filter 0.26s ease;
    will-change: transform;
  }

  .mini-theory-card img {
    transition:
      transform 0.32s ease,
      filter 0.32s ease;
    will-change: transform;
  }

  .mini-theory-card:hover {
    transform: translateY(-8px) scale(1.018);

    border-color:
      rgba(255, 225, 68, 0.22);

    box-shadow:
      0 34px 90px rgba(15, 23, 42, 0.14),
      0 0 0 1px rgba(255, 225, 68, 0.12),
      0 0 42px rgba(255, 225, 68, 0.10);

    filter:
      saturate(1.03);
  }

  .mini-theory-card:hover img {
    transform: scale(1.025);

    filter:
      brightness(1.03)
      contrast(1.02);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mini-theory-card,
  .mini-theory-card img {
    transition: none;
    will-change: auto;
  }

  .mini-theory-card:hover,
  .mini-theory-card:hover img {
    transform: none;
  }
}