/* Library review */
.review-view {
  width: min(100%, 760px);
  margin: 0 auto;
  padding: 8px 0 48px;
  color: var(--ink);
}

.review-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 20px;
  align-items: center;
  margin-bottom: 20px;
  padding: 0 4px;
}

.review-header h2,
.review-state-card h3 {
  margin: 0;
  font-family: var(--serif);
  line-height: 1.08;
}

.review-header h2 { font-size: clamp(1.9rem, 5vw, 2.65rem); }

.review-kicker {
  margin: 0 0 5px;
  color: var(--rose-deep);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.review-streak {
  display: grid;
  grid-template-columns: auto auto;
  grid-template-rows: auto auto;
  column-gap: 8px;
  align-items: center;
  min-width: 112px;
  padding: 10px 14px;
  border: 1px solid color-mix(in srgb, var(--rose) 24%, var(--line));
  border-radius: 999px;
  background: var(--rose-ghost);
  box-shadow: var(--shadow-sm);
}

.review-streak > span {
  grid-row: 1 / 3;
  font-size: 1.35rem;
  filter: saturate(.75);
}

.review-streak strong { line-height: 1; }
.review-streak small { color: var(--muted); font-size: .65rem; white-space: nowrap; }

.review-progress {
  grid-column: 1 / -1;
  height: 8px;
  margin-top: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: color-mix(in srgb, var(--line) 70%, transparent);
}

.review-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--rose), var(--rose-deep));
  transition: width .35s ease;
}

.review-count {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  text-align: right;
}

.review-card,
.review-state-card,
.review-loading {
  border: 1px solid color-mix(in srgb, var(--line) 84%, transparent);
  box-shadow: var(--shadow);
}

.review-card {
  position: relative;
  min-height: 430px;
  padding: clamp(22px, 5vw, 42px);
  overflow: hidden;
}

.review-card::before {
  position: absolute;
  width: 180px;
  height: 180px;
  top: -100px;
  right: -70px;
  border-radius: 50%;
  background: var(--lilac-soft);
  content: '';
  opacity: .56;
  pointer-events: none;
}

.review-card-meta {
  position: relative;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.review-card-meta span {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--rose-soft);
  color: var(--rose-deep);
  font-size: .72rem;
  font-weight: 750;
  letter-spacing: .04em;
}

.review-card-meta span + span { background: var(--gold-soft); color: var(--ink); }
.review-question { position: relative; }

.review-view .mcq-q {
  max-width: 650px;
  margin-bottom: 24px;
  font-family: var(--serif);
  font-size: clamp(1.45rem, 4vw, 2.1rem);
  font-weight: 650;
  line-height: 1.3;
}

.review-view .mcq-opts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.review-view .mcq-opts button {
  display: flex;
  gap: 12px;
  align-items: center;
  min-height: 64px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--card);
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease, background .16s ease;
}

.review-view .mcq-opts button:hover:not(:disabled) {
  border-color: var(--rose);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.review-view .mcq-opts button:focus-visible,
.review-flip:focus-visible,
.review-self button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--rose) 34%, transparent);
  outline-offset: 3px;
}

.review-view .mcq-opts b,
.review-self kbd {
  display: grid;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--rose-ghost);
  color: var(--rose-deep);
  font: 700 .72rem/1 inherit;
}

.review-view .mcq-opts button.right {
  border-color: var(--sage);
  background: var(--sage-soft);
}

.review-view .mcq-opts button.wrong {
  border-color: var(--rose);
  background: var(--rose-soft);
}

.review-view .mcq-why {
  margin-top: 16px;
  padding: 13px 16px;
  border-radius: 12px;
  background: var(--sage-soft);
  line-height: 1.5;
}

.review-actions {
  display: flex;
  min-height: 56px;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
}

.review-feedback { margin: 0; font-weight: 700; }
.review-feedback.is-waiting { color: var(--muted); }
.review-feedback.is-right { color: var(--sage); }
.review-feedback.is-wrong { color: var(--rose-deep); }
.review-next { flex: 0 0 auto; }

.review-instruction { margin: -8px 0 14px; color: var(--muted); text-align: center; }
.review-flip { display: block; width: min(100%, 540px); height: 270px; margin: 0 auto; padding: 0; border: 0; background: transparent; color: inherit; cursor: pointer; perspective: 1100px; }
.review-flip-inner { position: relative; display: block; width: 100%; height: 100%; transition: transform .58s cubic-bezier(.2, .75, .25, 1); transform-style: preserve-3d; }
.review-flip.is-flipped .review-flip-inner { transform: rotateY(180deg); }

.review-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  justify-content: center;
  padding: 28px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--rose) 25%, var(--line));
  border-radius: var(--r-lg);
  background: linear-gradient(145deg, var(--rose-ghost), var(--card));
  box-shadow: var(--shadow);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.review-face::after {
  position: absolute;
  width: 120px;
  height: 120px;
  right: -44px;
  bottom: -54px;
  border-radius: 50%;
  background: var(--rose-soft);
  content: '';
}

.review-face small { color: var(--rose-deep); font-weight: 750; letter-spacing: .05em; text-transform: uppercase; }
.review-face strong { z-index: 1; font-family: var(--serif); font-size: clamp(1.65rem, 5vw, 2.8rem); line-height: 1.15; }
.review-face em { z-index: 1; max-width: 420px; color: var(--muted); font-size: .88rem; font-style: normal; line-height: 1.45; }
.review-back { background: linear-gradient(145deg, var(--sage-soft), var(--card)); transform: rotateY(180deg); }
.review-back strong { font-size: clamp(1.25rem, 4vw, 1.85rem); }

.review-self { display: flex; gap: 12px; justify-content: center; margin-top: 18px; }
.review-self button { display: inline-flex; gap: 9px; align-items: center; justify-content: center; min-width: 138px; min-height: 48px; border-radius: 999px; font: inherit; font-weight: 750; cursor: pointer; }
.review-self button:disabled { cursor: default; opacity: .62; }
.review-not-yet { border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.review-self .btn kbd { border-color: color-mix(in srgb, white 35%, transparent); background: color-mix(in srgb, white 16%, transparent); color: inherit; }

.review-state-card { padding: clamp(32px, 7vw, 64px); text-align: center; }
.review-state-card h3 { margin: 10px 0 12px; font-size: clamp(1.65rem, 5vw, 2.4rem); }
.review-state-card > p:not(.review-kicker) { max-width: 500px; margin: 0 auto; line-height: 1.65; }
.review-state-icon { display: grid; width: 68px; height: 68px; margin: 0 auto 18px; place-items: center; border-radius: 22px; background: var(--lilac-soft); color: var(--rose-deep); font-family: var(--serif); font-size: 1.35rem; font-weight: 750; transform: rotate(-3deg); }
.review-state-icon.review-check { background: var(--sage-soft); color: var(--sage); font-family: inherit; font-size: 1.8rem; transform: none; }
.review-finish .review-kicker { margin-top: 20px; }
.review-again { margin-top: 26px; }

.review-shelf {
  display: grid;
  grid-template-columns: repeat(6, minmax(42px, 1fr));
  gap: 7px;
  align-items: end;
  max-width: 540px;
  margin: 32px auto 0;
  padding: 18px 12px 12px;
  border-bottom: 6px solid color-mix(in srgb, var(--rose-deep) 28%, var(--line));
  border-radius: 0 0 8px 8px;
  background: linear-gradient(to top, var(--rose-ghost), transparent 70%);
}

.review-shelf-step { display: flex; min-width: 0; flex-direction: column; gap: 7px; align-items: center; justify-content: flex-end; }
.review-shelf-step strong { display: flex; width: 100%; min-height: 28px; align-items: center; justify-content: center; border: 1px solid color-mix(in srgb, var(--rose) 22%, var(--line)); border-radius: 9px 9px 3px 3px; background: var(--rose-soft); color: var(--rose-deep); font-size: .82rem; }
.review-shelf-step:nth-child(2n) strong { background: var(--lilac-soft); }
.review-shelf-step:nth-child(3n) strong { background: var(--gold-soft); }
.review-shelf-step span { color: var(--muted); font-size: .62rem; white-space: nowrap; }

.review-loading { display: grid; min-height: 250px; place-items: center; align-content: center; gap: 14px; color: var(--muted); }
.review-loading p { margin: 0; }
.review-loading span { width: 34px; height: 34px; border: 3px solid var(--rose-soft); border-top-color: var(--rose-deep); border-radius: 50%; animation: review-spin .75s linear infinite; }

@keyframes review-spin { to { transform: rotate(360deg); } }

@media (max-width: 700px) {
  .review-view { padding-bottom: 28px; }
  .review-header { gap: 8px 12px; }
  .review-streak { min-width: 0; padding: 9px 11px; }
  .review-streak small { font-size: .58rem; }
  .review-card { min-height: 0; padding: 21px 16px; }
  .review-card-meta { margin-bottom: 20px; }
  .review-view .mcq-opts { grid-template-columns: 1fr; gap: 9px; }
  .review-view .mcq-opts button { min-height: 57px; padding: 10px 12px; }
  .review-actions { align-items: stretch; flex-direction: column; }
  .review-next { width: 100%; }
  .review-flip { height: 250px; }
  .review-face { padding: 22px 18px; }
  .review-self { align-items: stretch; }
  .review-self button { min-width: 0; flex: 1; padding-inline: 10px; }
  .review-state-card { padding: 34px 18px; }
  .review-shelf { gap: 4px; padding-inline: 5px; }
  .review-shelf-step span { font-size: .54rem; }
}

@media (prefers-reduced-motion: reduce) {
  .review-progress span,
  .review-flip-inner,
  .review-view .mcq-opts button { transition: none; }
  .review-loading span { animation-duration: 1.5s; }
}