.flashcard-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  align-items: center;
  margin: 1rem 0 1.35rem;
}

.flashcard-toolbar .button {
  min-height: 44px;
  padding: .55rem .85rem;
  font-size: .9rem;
}

.flashcard-summary {
  width: 100%;
  margin: .15rem 0 0;
  color: var(--muted);
  font-size: .92rem;
}

.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.flashcard {
  display: flex;
  min-height: 260px;
  flex-direction: column;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 8px 28px rgba(24, 45, 80, .05);
}

.flashcard.is-open {
  border-color: color-mix(in srgb, var(--primary) 45%, var(--line));
}

.flashcard[data-confidence="known"] {
  border-inline-start-width: 4px;
  border-inline-start-color: var(--accent);
  box-shadow: 0 8px 28px rgba(24, 45, 80, .05);
}

.flashcard[data-confidence="review"] {
  border-inline-start-width: 4px;
  border-inline-start-color: #b45309;
  box-shadow: 0 8px 28px rgba(24, 45, 80, .05);
}

.flashcard__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem .75rem;
  margin-bottom: .8rem;
  color: var(--muted);
  font-size: .8rem;
}

.flashcard__question {
  margin: 0 0 1rem;
  font-size: 1.08rem;
}

.flashcard__answer {
  margin: 0 0 1rem;
  padding: .9rem;
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  background: var(--surface-soft);
}

.flashcard__answer p {
  margin: 0;
}

.flashcard__source {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: .82rem;
}

.flashcard__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: auto;
}

.flashcard__actions button {
  min-height: 44px;
  flex: 1 1 170px;
  padding: .55rem .75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  font-weight: 700;
}

.flashcard__actions button:hover:not(:disabled),
.flashcard__actions button[aria-pressed="true"] {
  border-color: currentColor;
  color: var(--text);
  background: var(--surface-soft);
}

.flashcard-toolbar .button:focus-visible,
.flashcard__actions button:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}

.flashcard__actions button:disabled {
  cursor: not-allowed;
  opacity: .48;
}

.flashcard__actions [data-flashcard-toggle] {
  width: 100%;
  flex-basis: 100%;
  border-width: 2px;
  border-color: var(--primary);
  color: var(--text);
}

.flashcard__actions button[aria-pressed="true"] {
  border-width: 2px;
  font-weight: 800;
}

.flashcard__actions button[aria-pressed="true"]::before {
  content: "✓ ";
}

.source-reference {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  background: var(--surface);
  font-size: .92rem;
}

html[data-ntt-theme="dark"] .flashcard,
html[data-ntt-theme="dark"] .flashcard__actions button {
  box-shadow: none;
}

html[data-ntt-theme="dark"] .lesson [data-flashcard-deck] p {
  color: var(--text);
}

html[data-ntt-theme="dark"] .lesson [data-flashcard-deck] .flashcard-summary,
html[data-ntt-theme="dark"] .lesson [data-flashcard-deck] .flashcard__source,
html[data-ntt-theme="dark"] .lesson [data-flashcard-deck] .source-reference {
  color: var(--muted);
}

html[data-ntt-contrast="high"] .flashcard {
  border-width: 2px;
  box-shadow: none;
}

html[data-ntt-contrast="high"] .flashcard__actions button:not(:disabled) {
  border-width: 2px;
}

@media (max-width: 760px) {
  .flashcard-grid {
    grid-template-columns: 1fr;
  }

  .flashcard {
    min-height: 0;
  }

  .flashcard__actions button {
    flex-basis: 100%;
  }
}

@media (forced-colors: active) {
  .flashcard,
  .flashcard.is-open,
  .flashcard[data-confidence] {
    border: 2px solid CanvasText;
    box-shadow: none;
  }

  .flashcard[data-confidence] {
    border-inline-start-width: 6px;
  }

  .flashcard__actions button[aria-pressed="true"] {
    outline: 3px solid Highlight;
    outline-offset: 2px;
  }
}