/* shelf.css — Learn bookshelf and flashcard decks.
   Split from app.module.css; load order in app.html preserves the original cascade. */

/* ---------- learn ---------- */

.cat {
  background: var(--paper);
  border: 1.5px solid var(--line-2);
  border-radius: var(--r);
  padding: 16px;
  text-align: left;
  transition:
    transform 0.08s var(--ease),
    background 0.12s var(--ease);
}

.cat:active {
  transform: scale(0.985);
  background: var(--panel);
}

.cat .i {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--line-1);
  font-size: 1.25rem;
  line-height: 1;
  margin-bottom: 10px;
}

.cat .n {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  letter-spacing: 0;
}

.cat .c {
  display: block;
  color: var(--ink-2);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: 2px;
}

.fact {
  background: var(--paper);
  border: 1.5px solid var(--line-2);
  border-radius: var(--r);
  padding: 14px 16px;
  margin-bottom: 8px;
}

.fact b {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 2px;
}

.fact span {
  color: var(--ink-2);
  font-weight: 500;
  font-size: 0.95rem;
  line-height: 1.5;
}

#learn .big {
  margin-top: 20px;
}

/* ---------- flashcards ---------- */
.deck {
  display: block;
  width: 100%;
  background: var(--paper);
  border: 1.5px solid var(--line-2);
  border-radius: var(--r);
  padding: 14px 16px;
  margin-bottom: 8px;
  text-align: left;
  transition:
    transform 0.08s var(--ease),
    background 0.12s var(--ease);
}

.deck:active {
  transform: scale(0.985);
  background: var(--panel);
}

.deck b {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0;
}

.deck span {
  display: block;
  color: var(--ink-2);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: 2px;
}

.flip {
  position: relative;
  width: 100%;
  min-height: 340px;
  transform-style: preserve-3d;
  transition: transform 0.5s var(--ease);
  cursor: pointer;
  user-select: none;
}

.flip.on {
  transform: rotateY(180deg);
}

.face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--paper);
  border: 1.5px solid var(--line-2);
  border-radius: var(--r-lg);
  box-shadow: var(--drop) var(--lip);
  padding: 30px 24px 42px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow-y: auto;
}

.face.back {
  transform: rotateY(180deg);
  background: var(--brand-soft);
  border-color: var(--brand-line);
  box-shadow: var(--drop) var(--brand-line);
}

.face .k {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0;
  text-wrap: balance;
}

.face .v {
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink-2);
  margin-top: 12px;
  line-height: 1.5;
}

.face.back .v {
  color: var(--brand-ink);
}

.rate {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.rate button {
  padding: 14px 18px;
  border-radius: var(--r);
  line-height: 1.5;
  transition:
    transform 0.08s var(--ease),
    box-shadow 0.08s var(--ease);
}

.rate .again {
  background: var(--amber);
  color: #4a3000;
  box-shadow: var(--drop) var(--amber-lip);
}

.rate .again:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 var(--amber-lip);
}

.rate .got {
  background: var(--green);
  color: #fff;
  box-shadow: var(--drop) var(--green-lip);
}

.rate .got:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 var(--green-lip);
}