.srs-review {
  margin: 2rem auto 1.5rem;
}

.srs-review__panel {
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 24px;
  padding: 1.35rem;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 24px 54px rgba(15, 23, 42, 0.08);
}

.srs-review__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.srs-review__eyebrow {
  margin: 0 0 0.25rem;
  color: #64748b;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.srs-review__title {
  margin: 0;
  color: #0f172a;
  font-size: 1.35rem;
}

.srs-review__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.5rem;
  padding: 0.38rem 0.8rem;
  border-radius: 999px;
  background: rgba(30, 41, 59, 0.08);
  color: #334155;
  font-size: 0.88rem;
  font-weight: 700;
}

.srs-review__badge.is-muted {
  background: rgba(239, 68, 68, 0.12);
  color: #b91c1c;
}

.srs-review__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0 1.15rem;
}

.srs-review__stat {
  padding: 0.75rem 0.85rem;
  border-radius: 18px;
  background: rgba(248, 250, 252, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.16);
}

.srs-review__stat-value {
  display: block;
  color: #0f172a;
  font-size: 1.1rem;
  font-weight: 700;
}

.srs-review__stat-label {
  color: #64748b;
  font-size: 0.82rem;
}

.srs-review__message {
  margin: 0;
  color: #475569;
  line-height: 1.7;
}

.srs-review__flashcard {
  margin-bottom: 1rem;
  padding: 1.15rem;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(241, 245, 249, 0.96), rgba(255, 255, 255, 0.96));
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.srs-review__prompt {
  margin-bottom: 0.55rem;
  color: #0f172a;
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  font-family: "Noto Serif SC", "Songti SC", "STSong", "PingFang SC", "Microsoft YaHei", serif;
}

.srs-review__hint,
.srs-review__source,
.srs-review__pinyin,
.srs-review__gloss,
.srs-review__progress-label {
  margin: 0;
}

.srs-review__hint {
  color: #64748b;
  text-align: center;
}

.srs-review__answer {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-top: 1rem;
}

.srs-review__pinyin {
  color: #475569;
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.srs-review__gloss {
  color: #0f172a;
  font-size: 1.02rem;
  line-height: 1.6;
}

.srs-review__source {
  color: #64748b;
  font-size: 0.9rem;
}

.srs-review__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.srs-review__audio,
.srs-review__reveal,
.srs-review__grade,
.srs-save-btn {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.srs-review__reveal,
.srs-save-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.72rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  color: #f8fafc;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.srs-review__reveal:hover,
.srs-save-btn:hover,
.srs-review__grade:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.12);
}

.srs-review__grades {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
}

.srs-review__grade {
  padding: 0.7rem 0.85rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.96);
  color: #0f172a;
  font-weight: 700;
  border: 1px solid rgba(148, 163, 184, 0.22);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.srs-review__grade[data-srs-quality="1"] {
  border-color: rgba(248, 113, 113, 0.42);
}

.srs-review__grade[data-srs-quality="3"] {
  border-color: rgba(251, 191, 36, 0.42);
}

.srs-review__grade[data-srs-quality="4"] {
  border-color: rgba(96, 165, 250, 0.42);
}

.srs-review__grade[data-srs-quality="5"] {
  border-color: rgba(74, 222, 128, 0.42);
}

.srs-review__progress-bar {
  overflow: hidden;
  width: 100%;
  height: 0.7rem;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.18);
}

.srs-review__progress-bar > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #3b82f6, #22c55e);
}

.srs-review__progress-label {
  margin-top: 0.55rem;
  color: #64748b;
  font-size: 0.85rem;
}

.srs-popover__actions {
  margin-top: 0.8rem;
}

.srs-save-btn {
  width: 100%;
  justify-content: center;
  background: linear-gradient(135deg, #0f766e, #2563eb);
}

.srs-save-btn.is-saved,
.srs-save-btn:disabled {
  cursor: default;
  background: linear-gradient(135deg, #15803d, #16a34a);
  opacity: 0.96;
  box-shadow: none;
  transform: none;
}

@media (max-width: 768px) {
  .srs-review__panel {
    padding: 1rem;
  }

  .srs-review__header {
    flex-direction: column;
  }

  .srs-review__stats,
  .srs-review__grades {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .srs-review__grade,
  .srs-review__reveal,
  .srs-save-btn {
    width: 100%;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-user-color-scheme]) .srs-review__panel,
  :root:not([data-user-color-scheme]) .srs-review__flashcard,
  :root:not([data-user-color-scheme]) .srs-review__stat,
  :root:not([data-user-color-scheme]) .srs-review__grade {
    background: rgba(15, 23, 42, 0.88);
    border-color: rgba(148, 163, 184, 0.18);
    box-shadow: none;
  }

  :root:not([data-user-color-scheme]) .srs-review__title,
  :root:not([data-user-color-scheme]) .srs-review__prompt,
  :root:not([data-user-color-scheme]) .srs-review__gloss,
  :root:not([data-user-color-scheme]) .srs-review__stat-value,
  :root:not([data-user-color-scheme]) .srs-review__grade {
    color: #f8fafc;
  }

  :root:not([data-user-color-scheme]) .srs-review__eyebrow,
  :root:not([data-user-color-scheme]) .srs-review__hint,
  :root:not([data-user-color-scheme]) .srs-review__source,
  :root:not([data-user-color-scheme]) .srs-review__progress-label,
  :root:not([data-user-color-scheme]) .srs-review__stat-label,
  :root:not([data-user-color-scheme]) .srs-review__pinyin,
  :root:not([data-user-color-scheme]) .srs-review__message {
    color: #cbd5e1;
  }

  :root:not([data-user-color-scheme]) .srs-review__badge {
    background: rgba(96, 165, 250, 0.16);
    color: #bfdbfe;
  }
}

[data-user-color-scheme="dark"] .srs-review__panel,
[data-user-color-scheme="dark"] .srs-review__flashcard,
[data-user-color-scheme="dark"] .srs-review__stat,
[data-user-color-scheme="dark"] .srs-review__grade {
  background: rgba(15, 23, 42, 0.88);
  border-color: rgba(148, 163, 184, 0.18);
  box-shadow: none;
}

[data-user-color-scheme="dark"] .srs-review__title,
[data-user-color-scheme="dark"] .srs-review__prompt,
[data-user-color-scheme="dark"] .srs-review__gloss,
[data-user-color-scheme="dark"] .srs-review__stat-value,
[data-user-color-scheme="dark"] .srs-review__grade {
  color: #f8fafc;
}

[data-user-color-scheme="dark"] .srs-review__eyebrow,
[data-user-color-scheme="dark"] .srs-review__hint,
[data-user-color-scheme="dark"] .srs-review__source,
[data-user-color-scheme="dark"] .srs-review__progress-label,
[data-user-color-scheme="dark"] .srs-review__stat-label,
[data-user-color-scheme="dark"] .srs-review__pinyin,
[data-user-color-scheme="dark"] .srs-review__message {
  color: #cbd5e1;
}

[data-user-color-scheme="dark"] .srs-review__badge {
  background: rgba(96, 165, 250, 0.16);
  color: #bfdbfe;
}