.flash-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 16px;
  min-height: calc(100vh - 60px);
}

.flash-sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.flash-main {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.field--row {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.field__label {
  font-size: 0.75rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.vocab-editor {
  max-height: 280px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 10px 0;
}

.vocab-row {
  display: grid;
  grid-template-columns: 1fr 1.2fr auto;
  gap: 6px;
  align-items: start;
}

.vocab-row input,
.vocab-row textarea {
  width: 100%;
  background: var(--surface-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 8px;
  font: inherit;
}

.vocab-row textarea {
  min-height: 52px;
  resize: vertical;
}

.vocab-row__remove {
  background: var(--surface-btn);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 8px;
  cursor: pointer;
}

.vocab-row__remove:hover {
  border-color: var(--btn-hover-border);
  color: var(--text);
}

.mode-tabs {
  display: flex;
  gap: 8px;
}

.mode-tab {
  background: var(--surface-toc);
  border: 1px solid var(--border-strong);
  color: var(--text-soft);
  border-radius: var(--radius);
  padding: 0.625rem 1rem;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.mode-tab:hover {
  color: var(--text);
  border-color: var(--btn-hover-border);
}

.mode-tab--active {
  border-color: var(--toc-active-border);
  background: var(--toc-active-bg);
  color: var(--accent);
  font-weight: 600;
}

.drill-panel,
.quiz-panel {
  background: linear-gradient(180deg, var(--surface-panel-shine), transparent 60%), var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}

.flashcard {
  perspective: 1200px;
  max-width: 640px;
  margin: 0 auto 20px;
  min-height: 220px;
  cursor: pointer;
}

.flashcard__inner {
  position: relative;
  width: 100%;
  min-height: 220px;
  transition: transform 0.5s;
  transform-style: preserve-3d;
}

.flashcard__inner--flipped {
  transform: rotateY(180deg);
}

.flashcard__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel2);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.flashcard__face--back {
  transform: rotateY(180deg);
}

.flashcard__label {
  font-size: 0.75rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  margin-bottom: 12px;
}

.flashcard__text {
  font-size: 1.35rem;
  line-height: 1.45;
  color: var(--text);
}

.flashcard__text--vocab-term {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 1.75rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.35;
  text-align: center;
}

.flashcard__text--vocab-definition {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-soft);
}

.drill-hint {
  text-align: center;
  margin: 0 0 16px;
}

.drill-controls,
.drill-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.quiz-question {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.quiz-question__prompt {
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 300;
  letter-spacing: -0.01em;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.quiz-option {
  text-align: left;
  background: var(--surface-toc);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  color: var(--text-soft);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.quiz-option:hover {
  color: var(--text);
  border-color: var(--btn-hover-border);
}

.quiz-option--selected {
  border-color: var(--btn-accent-border);
  background: var(--btn-accent-bg);
}

.quiz-option--correct {
  border-color: var(--good-border);
  background: var(--good-bg);
}

.quiz-option--wrong {
  border-color: var(--bad-border);
  background: var(--bad-bg);
}

.quiz-types {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  margin-bottom: 12px;
}

.flash-main a {
  color: var(--accent);
}

.flash-main code {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

.cli-hint {
  margin-top: 12px;
  padding: 10px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.78rem;
  overflow-x: auto;
  white-space: pre-wrap;
  color: var(--muted);
}

.hidden {
  display: none !important;
}

@media (max-width: 960px) {
  .flash-layout {
    grid-template-columns: 1fr;
  }
}

body[data-demo="true"] .flash-layout {
  grid-template-columns: 1fr;
}

body[data-demo="true"] .flash-sidebar {
  display: none;
}

body[data-demo="true"] .demoBanner {
  display: none;
}