/* ── Base Layout ── */

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  transition: background var(--transition-base), color var(--transition-base);
}

/* ── App Shell ── */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
}

.app-header h1 {
  font-size: var(--text-xl);
  font-weight: 600;
}

.app-header__actions {
  display: flex;
  gap: var(--space-sm);
}

.app-main {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.app-footer {
  text-align: center;
  padding: var(--space-lg);
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
}

/* ── Shared Components ── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  background: var(--color-danger-hover);
}

.btn-ghost {
  color: var(--color-text-secondary);
  background: transparent;
}

.btn-ghost:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}

/* ── Form Elements ── */

.input {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: border-color var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

/* ── Textarea in card form (supports multi-line content) ── */

textarea.input {
  resize: vertical;
  min-height: 72px;
  line-height: 1.5;
  font-family: inherit;
  width: 100%;
  box-sizing: border-box;
}

.card-form__ta {
  margin-bottom: var(--space-sm);
}

.quick-theme {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.quick-theme .input {
  flex: 1;
}

/* ── Multi-line card content display ── */

.card-item__face {
  white-space: pre-wrap;
  word-break: break-word;
}

/* ── Theme Toggle ── */

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 1.2rem;
  transition: background var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-bg-tertiary);
}

/* ── TTS Settings ── */

.tts-settings__grid {
  display: grid;
  gap: var(--space-md);
}

.tts-settings__field {
  display: grid;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  font-weight: 600;
}

.tts-settings__row {
  display: flex;
  gap: var(--space-sm);
}

.tts-settings__filters {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(120px, 0.45fr);
  gap: var(--space-sm);
}

.tts-settings__row .input {
  min-width: 0;
  flex: 1;
}

/* ── Tab Bar ── */

.tab-bar {
  display: flex;
  gap: 0;
  margin-bottom: var(--space-lg);
  border-bottom: 2px solid var(--color-border);
}

.tab {
  padding: var(--space-sm) var(--space-lg);
  cursor: pointer;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition-fast);
}

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

.tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ── Tab Panel ── */

.tab-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.tab-panel__header h2 {
  font-size: var(--text-lg);
  font-weight: 600;
}

.tab-panel__actions {
  display: flex;
  gap: var(--space-sm);
}

.tab-panel__add {
  display: flex;
  gap: var(--space-sm);
}

.tab-panel__filters {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.tab-panel__filters .input {
  flex: 1;
}

.theme-search {
  width: 100%;
  margin-bottom: var(--space-sm);
}

/* ── Theme List ── */

.theme-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.theme-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  transition: background var(--transition-fast);
}

.theme-item:hover {
  background: var(--color-bg-tertiary);
}

.theme-item--system {
  border: 1px solid var(--color-border);
  background: var(--color-bg);
}

.theme-item__title {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.theme-item__name {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 500;
}

.theme-item__description {
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  line-height: 1.35;
}

.theme-item__badge,
.theme-item__lock {
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
}

.theme-item__badge {
  padding: 1px 6px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg-secondary);
}

.theme-item__count {
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  margin: 0 var(--space-md);
}

.theme-item__actions {
  display: flex;
  gap: var(--space-xs);
}

.theme-composition {
  display: block;
}

.theme-composition-overlay {
  padding: var(--space-md);
}

.theme-composition__header,
.theme-composition__option,
.theme-composition__actions,
.theme-composition__chips {
  display: flex;
  align-items: center;
}

.theme-composition__header,
.theme-composition__option {
  justify-content: space-between;
  gap: var(--space-sm);
}

.theme-composition__header h3 {
  margin: 0;
  font-size: var(--text-base);
}

.theme-composition__counts,
.theme-composition__chips {
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
}

.theme-composition__chips,
.theme-composition__parents,
.theme-composition__actions {
  gap: var(--space-xs);
}

.theme-composition__chips {
  margin: var(--space-sm) 0;
}

.theme-composition__parents {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-top: var(--space-sm);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
}

.theme-composition__chips span,
.theme-composition__parents span {
  padding: 2px 8px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg-secondary);
}

.theme-composition__parents .theme-composition__parents-label {
  border-color: transparent;
  background: transparent;
  padding-left: 0;
}

.theme-composition__parents .theme-composition__parents-more {
  color: var(--color-text-secondary);
  border-style: dashed;
}

.theme-graph {
  margin-top: var(--space-sm);
}

.theme-graph__toolbar,
.theme-graph__cols,
.theme-graph-modal__header,
.theme-graph-modal__tools {
  display: flex;
  align-items: center;
}

.theme-graph__toolbar {
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: 700;
}

.theme-graph__cols {
  align-items: stretch;
  gap: var(--space-sm);
}

.theme-graph__col {
  flex: 1;
  min-width: 0;
  max-height: min(260px, 34vh);
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  overflow: auto;
}

.theme-graph h4 {
  position: sticky;
  top: calc(var(--space-sm) * -1);
  z-index: 1;
  margin: 0 0 var(--space-xs);
  padding: 0 0 var(--space-xs);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: 700;
}

.theme-graph ul {
  list-style: none;
  margin: 0;
  padding-left: var(--space-md);
}

.theme-graph__col > ul {
  padding-left: 0;
}

.theme-graph li {
  position: relative;
  margin-top: var(--space-xs);
}

.theme-graph li::before {
  content: "";
  position: absolute;
  top: 0.8em;
  left: calc(var(--space-sm) * -1);
  width: var(--space-xs);
  border-top: 1px solid var(--color-border);
}

.theme-graph__col > ul > li::before {
  display: none;
}

.theme-graph__node {
  display: inline-block;
  max-width: 100%;
  padding: 2px 8px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  overflow-wrap: anywhere;
}

.theme-graph__node small {
  display: block;
  margin-top: 1px;
  color: var(--color-text-tertiary);
  font-size: 0.72rem;
  font-weight: 400;
}

.theme-graph__node--current {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.theme-graph__node--muted {
  color: var(--color-danger);
  border-color: rgba(255, 59, 48, 0.28);
  background: var(--color-danger-soft);
}

.theme-graph-modal-overlay {
  z-index: 120;
  padding: var(--space-sm);
  background: rgba(0,0,0,0.48);
}

.theme-graph-modal {
  display: flex;
  flex-direction: column;
}

.theme-graph-modal__header {
  justify-content: space-between;
  gap: var(--space-sm);
}

.theme-graph-modal__header h3 {
  margin: 0;
  font-size: var(--text-lg);
}

.theme-graph-modal__header p {
  margin: 2px 0 0;
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
}

.theme-graph-modal__tools {
  justify-content: flex-end;
  gap: var(--space-xs);
  margin: var(--space-sm) 0;
}

.theme-graph-stage {
  flex: 1;
  min-height: min(640px, calc(100vh - 168px));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  overflow: hidden;
  cursor: grab;
  touch-action: none;
}

.theme-graph-stage:active {
  cursor: grabbing;
}

.theme-graph-stage svg {
  display: block;
  width: 100%;
  height: 100%;
}

.theme-graph-stage__edge {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 2.5;
}

.theme-graph-stage__edge--muted {
  stroke: var(--color-danger);
  stroke-dasharray: 8 6;
}

.theme-graph-stage__node rect {
  fill: var(--color-bg);
  stroke: var(--color-border);
  stroke-width: 1.5;
}

.theme-graph-stage__node text {
  fill: var(--color-text-secondary);
  font-size: 16px;
  text-anchor: middle;
  pointer-events: none;
}

.theme-graph-stage__count {
  fill: var(--color-text-tertiary);
  font-size: 12.5px;
  font-weight: 400;
}

.theme-graph-stage__node.is-current rect {
  fill: var(--color-accent-soft);
  stroke: var(--color-accent);
}

.theme-graph-stage__node.is-current text {
  fill: var(--color-accent);
  font-weight: 700;
}

.theme-graph-stage__node.is-muted rect {
  fill: var(--color-danger-soft);
  stroke: var(--color-danger);
}

.theme-graph-stage__node.is-muted text {
  fill: var(--color-danger);
}

.theme-graph-stage__node.is-muted .theme-graph-stage__count {
  fill: var(--color-danger);
  opacity: 0.76;
}

.theme-composition__options {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-height: min(52vh, 420px);
  overflow: auto;
}

.theme-composition__filters,
.theme-composition__pager,
.theme-composition__pager-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.theme-composition__filters {
  margin-bottom: var(--space-sm);
}

.theme-composition__pager {
  justify-content: space-between;
  margin-top: var(--space-sm);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
}

.theme-composition__option {
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
}

.theme-composition__name {
  min-width: 0;
  font-weight: 500;
  overflow-wrap: anywhere;
}

.theme-composition__option-count {
  display: block;
  margin-top: 2px;
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: 400;
}

.theme-picker__group {
  flex: 0 0 100%;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding-top: var(--space-xs);
}

.theme-picker__group + .theme-picker__group {
  margin-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

.theme-picker__group-title {
  flex: 0 0 100%;
  margin: var(--space-xs) 0;
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  font-weight: 700;
}

/* ── Card List ── */

.card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.card-item {
  display: flex;
  flex-direction: column;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  transition: background var(--transition-fast);
}

.card-item:hover {
  background: var(--color-bg-tertiary);
}

.card-item__faces {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xs);
}

.card-item__face {
  flex: 1;
  font-size: var(--text-sm);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.card-item__face em {
  font-style: normal;
  color: var(--color-text-tertiary);
  margin-right: var(--space-xs);
  font-size: var(--text-xs);
}

.card-item__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.card-item__info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  min-width: 0;
}

.card-item__themes {
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
}

.card-item__stats {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
}

.card-item__stats span {
  padding: 1px 6px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
}

.card-item__actions {
  display: flex;
  flex-shrink: 0;
  gap: var(--space-xs);
}

/* ── Empty State ── */

.empty-state {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  color: var(--color-text-tertiary);
}

.empty-state__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.empty-state__text {
  font-size: var(--text-sm);
}

/* ── Modal ── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  max-width: 480px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 4px 24px rgba(0,0,0,0.15);
}

.modal--wide {
  max-width: 680px;
}

.modal.theme-graph-modal {
  width: min(1440px, calc(100vw - 24px));
  max-width: none;
  height: calc(100vh - 24px);
  max-height: none;
  padding: var(--space-md);
}

.modal h3 {
  margin-bottom: var(--space-md);
  font-size: var(--text-lg);
  font-weight: 600;
}

.field-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
  margin-top: var(--space-sm);
}

.field-label:first-of-type {
  margin-top: 0;
}

.bulk-create__help {
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  line-height: 1.5;
}

.bulk-create__examples {
  margin: 0 0 var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  line-height: 1.6;
  white-space: pre-wrap;
}

.bulk-create__file-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}

.bulk-create__file {
  flex: 0 1 260px;
}

.bulk-create__file-tip {
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
}

.bulk-create__ta {
  min-height: 220px;
  max-height: 42vh;
  overflow-y: auto;
}

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
}

.checkbox-label:hover {
  background: var(--color-bg-tertiary);
}

.modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

/* ── List Mode ── */

.list-config {
  margin-bottom: var(--space-lg);
}

.list-config__row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}

.list-config__row label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.list-table {
  width: 100%;
  border-collapse: collapse;
}

.list-table th,
.list-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.list-table th {
  color: var(--color-text-tertiary);
  font-weight: 500;
  font-size: var(--text-xs);
}

.list-table td {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
}

.list-table tr:hover td {
  background: var(--color-bg-tertiary);
}

/* ── Quiz Mode ── */

.quiz-config {
  margin-bottom: var(--space-lg);
}

.quiz-config__row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}

.quiz-config__row label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.quiz-progress {
  display: grid;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.quiz-progress__meta,
.quiz-progress__energy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.quiz-progress__encourage {
  color: var(--color-text-tertiary);
}

.quiz-streak {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 var(--space-sm);
  border-radius: 999px;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.quiz-streak--hot {
  color: #b06000;
  border-color: rgba(255, 159, 10, 0.45);
  background: rgba(255, 159, 10, 0.12);
  animation: quiz-streak-pulse 900ms ease both;
}

.quiz-progress__bar {
  width: 100%;
  height: 6px;
  background: var(--color-border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: var(--space-xs);
}

.quiz-progress__fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: 3px;
  transition: width 0.3s;
}

.progress-bar {
  width: 100%;
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--color-bg-tertiary);
}

.progress-bar__fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--color-accent), var(--color-success), var(--color-warning));
  transition: width 360ms ease;
}

.quiz-mode--progress-milestone .progress-bar__fill {
  box-shadow: 0 0 16px rgba(52, 199, 89, 0.55);
}

/* ── Card Flip ── */

.card-flip {
  perspective: 1000px;
  margin: var(--space-lg) auto;
  max-width: 480px;
  cursor: default;
  animation: quiz-card-enter 320ms ease both;
}

.card-flip--no-enter {
  animation: none;
}

.card-flip-inner,
.card-flip__inner {
  transition: transform 0.5s;
  transform-style: preserve-3d;
  position: relative;
  min-height: 260px;
}

.card-flip.flipped .card-flip-inner,
.card-flip__inner.flipped {
  transform: rotateY(180deg);
}

.card-flip-front,
.card-flip-back,
.card-flip__front,
.card-flip__back {
  backface-visibility: hidden;
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  min-height: 260px;
}

.card-flip-back,
.card-flip__back {
  transform: rotateY(180deg);
}

.card-flip__face--question {
  background: linear-gradient(145deg, rgba(0, 113, 227, 0.1), var(--color-bg-secondary) 58%);
  border-color: rgba(0, 113, 227, 0.28);
}

.card-flip__face--answer {
  background: linear-gradient(145deg, rgba(52, 199, 89, 0.13), var(--color-bg-secondary) 58%);
  border-color: rgba(52, 199, 89, 0.32);
}

.card-flip--correct .card-flip__front,
.card-flip--correct .card-flip__back {
  border-color: rgba(52, 199, 89, 0.55);
  box-shadow: 0 16px 40px rgba(52, 199, 89, 0.16);
}

.card-flip--wrong {
  animation: quiz-card-shake 380ms ease both;
}

.card-flip--wrong .card-flip__front,
.card-flip--wrong .card-flip__back {
  border-color: rgba(255, 59, 48, 0.5);
  box-shadow: 0 16px 40px rgba(255, 59, 48, 0.12);
}

.card-flip__label,
.card-flip__face-label {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(0, 0, 0, 0.06);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-flip__face--question .card-flip__face-label {
  color: var(--color-accent);
  border-color: rgba(0, 113, 227, 0.22);
}

.card-flip__face--answer .card-flip__face-label {
  color: #248a3d;
  border-color: rgba(52, 199, 89, 0.28);
}

html.dark .card-flip__face-label {
  background: rgba(28, 28, 30, 0.72);
}

html.dark .card-flip__face--answer .card-flip__face-label {
  color: #32d74b;
}

.card-flip__text {
  font-size: var(--text-lg);
  text-align: center;
  line-height: 1.6;
  word-break: break-word;
  white-space: pre-wrap;
  max-width: 100%;
  max-height: 100%;
  overflow: auto;
}

.card-flip__text--short {
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1.18;
}

.card-flip__text--medium {
  font-size: var(--text-2xl);
  font-weight: 650;
  line-height: 1.35;
}

.card-flip__text--long {
  font-size: var(--text-lg);
  line-height: 1.65;
}

/* ── Quiz Actions ── */

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.quiz-actions .btn {
  min-width: 100px;
}

.quiz-actions .quiz-read-btn {
  min-width: 48px;
  padding-inline: var(--space-sm);
}

.quiz-actions .btn:disabled {
  cursor: default;
  opacity: 0.58;
  transform: none;
}

.quiz-actions .btn:hover {
  transform: translateY(-1px);
}

.quiz-actions .btn:disabled:hover {
  transform: none;
}

.quiz-actions .btn:active {
  transform: translateY(1px) scale(0.98);
}

.quiz-card-area {
  position: relative;
}

.quiz-feedback {
  position: absolute;
  z-index: 3;
  left: 50%;
  top: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  max-width: min(92vw, 440px);
  padding: var(--space-xs) var(--space-md);
  border-radius: 999px;
  color: #fff;
  font-weight: 700;
  pointer-events: none;
  box-shadow: var(--shadow-lg);
  transform: translate(-50%, -30%);
  animation: quiz-feedback-pop 1100ms ease both;
}

.quiz-feedback--correct {
  background: linear-gradient(135deg, #188038, #34c759);
}

.quiz-feedback--wrong {
  background: linear-gradient(135deg, #c5221f, #ff9f0a);
}

.quiz-feedback--review {
  background: linear-gradient(135deg, #0071e3, #34c759);
}

.quiz-feedback__icon {
  font-size: 1.15rem;
}

.quiz-feedback__text,
.quiz-feedback__badge {
  white-space: nowrap;
}

.quiz-feedback__badge {
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.22);
  font-size: var(--text-xs);
}

.quiz-sparks,
.quiz-spark,
.quiz-finale,
.quiz-finale__spark {
  pointer-events: none;
}

.quiz-spark,
.quiz-finale__spark {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #fff;
  opacity: 0;
}

.quiz-spark {
  left: 50%;
  top: 50%;
  animation: quiz-spark 800ms ease-out both;
}

.quiz-spark--1 { --x: -110px; --y: -32px; background: #fff; }
.quiz-spark--2 { --x: -88px; --y: 36px; background: #ffd60a; }
.quiz-spark--3 { --x: -48px; --y: -54px; background: #64d2ff; }
.quiz-spark--4 { --x: -18px; --y: 48px; background: #fff; }
.quiz-spark--5 { --x: 24px; --y: -62px; background: #ffd60a; }
.quiz-spark--6 { --x: 58px; --y: 42px; background: #64d2ff; }
.quiz-spark--7 { --x: 92px; --y: -38px; background: #fff; }
.quiz-spark--8 { --x: 118px; --y: 28px; background: #ffd60a; }
.quiz-spark--9 { --x: 0; --y: -82px; background: #64d2ff; }
.quiz-spark--10 { --x: 0; --y: 70px; background: #fff; }

/* ── Quiz Result Panel ── */

.quiz-results {
  position: relative;
  overflow: hidden;
  text-align: center;
  animation: quiz-result-enter 420ms ease both;
}

.quiz-results h2 {
  position: relative;
  z-index: 1;
}

.quiz-results__motto {
  position: relative;
  z-index: 1;
  margin: var(--space-xs) 0 var(--space-lg);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.quiz-results__stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
}

.quiz-results__note {
  position: relative;
  z-index: 1;
  margin: 0 0 var(--space-md);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.quiz-results__actions {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.stat {
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  animation: quiz-stat-rise 460ms ease both;
}

.stat:nth-child(2) { animation-delay: 60ms; }
.stat:nth-child(3) { animation-delay: 120ms; }
.stat:nth-child(4) { animation-delay: 180ms; }
.stat:nth-child(5) { animation-delay: 240ms; }
.stat:nth-child(6) { animation-delay: 300ms; }

.stat--streak {
  border-color: rgba(255, 159, 10, 0.42);
  background: rgba(255, 159, 10, 0.1);
}

.stat__val {
  display: block;
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-accent);
}

.stat__label {
  display: block;
  margin-top: var(--space-xs);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
}

.quiz-detail {
  position: relative;
  z-index: 1;
  margin-top: var(--space-lg);
  text-align: left;
}

.quiz-detail__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.quiz-detail__item span {
  min-width: 0;
  word-break: break-word;
}

.quiz-detail__icon,
.quiz-detail__sep {
  color: var(--color-text-tertiary);
}

.quiz-finale {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.quiz-finale__spark {
  top: 50%;
  left: 50%;
  animation: quiz-finale-spark 1100ms ease-out both;
}

.quiz-finale__spark--1 { --x: -330px; --y: -110px; background: #34c759; animation-delay: 0ms; }
.quiz-finale__spark--2 { --x: -280px; --y: 80px; background: #ff9f0a; animation-delay: 70ms; }
.quiz-finale__spark--3 { --x: -220px; --y: -150px; background: #64d2ff; animation-delay: 120ms; }
.quiz-finale__spark--4 { --x: -150px; --y: 130px; background: #ffd60a; animation-delay: 40ms; }
.quiz-finale__spark--5 { --x: -80px; --y: -90px; background: #ff3b30; animation-delay: 170ms; }
.quiz-finale__spark--6 { --x: 0; --y: -155px; background: #34c759; animation-delay: 90ms; }
.quiz-finale__spark--7 { --x: 70px; --y: 120px; background: #64d2ff; animation-delay: 140ms; }
.quiz-finale__spark--8 { --x: 130px; --y: -120px; background: #ff9f0a; animation-delay: 30ms; }
.quiz-finale__spark--9 { --x: 190px; --y: 95px; background: #34c759; animation-delay: 180ms; }
.quiz-finale__spark--10 { --x: 250px; --y: -80px; background: #ffd60a; animation-delay: 60ms; }
.quiz-finale__spark--11 { --x: 300px; --y: 140px; background: #ff3b30; animation-delay: 110ms; }
.quiz-finale__spark--12 { --x: -20px; --y: 165px; background: #64d2ff; animation-delay: 210ms; }
.quiz-finale__spark--13 { --x: -360px; --y: 20px; background: #ffd60a; animation-delay: 150ms; }
.quiz-finale__spark--14 { --x: 350px; --y: 10px; background: #34c759; animation-delay: 20ms; }

.quiz-result {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.quiz-result__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-md);
}

.quiz-result__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.quiz-result__stat {
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
}

.quiz-result__stat-value {
  font-size: var(--text-xxl);
  font-weight: 700;
  color: var(--color-accent);
}

.quiz-result__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
}

.quiz-result__detail {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.quiz-result__card {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  text-align: left;
}

.quiz-result__card-side {
  flex: 1;
  font-size: var(--text-sm);
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-wrap;
}

.quiz-result__card-side em {
  font-style: normal;
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  margin-right: var(--space-xs);
}

.quiz-result__card-badge {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: var(--text-xs);
  white-space: nowrap;
}

.quiz-result__card-badge--pass    { background: #e6f4ea; color: #137333; }
.quiz-result__card-badge--review  { background: #fef7e0; color: #b06000; }
.quiz-result__card-badge--hard    { background: #fce8e6; color: #c5221f; }

@keyframes quiz-card-enter {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes quiz-card-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px) rotate(-0.6deg); }
  40% { transform: translateX(7px) rotate(0.6deg); }
  60% { transform: translateX(-4px) rotate(-0.3deg); }
  80% { transform: translateX(4px) rotate(0.3deg); }
}

@keyframes quiz-feedback-pop {
  0% { opacity: 0; transform: translate(-50%, -10%) scale(0.86); }
  18% { opacity: 1; transform: translate(-50%, -45%) scale(1.06); }
  75% { opacity: 1; transform: translate(-50%, -58%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -74%) scale(0.96); }
}

@keyframes quiz-spark {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
  18% { opacity: 1; }
  100% { opacity: 0; transform: translate(calc(-50% + var(--x)), calc(-50% + var(--y))) scale(0.9); }
}

@keyframes quiz-streak-pulse {
  0% { transform: scale(0.96); }
  45% { transform: scale(1.06); }
  100% { transform: scale(1); }
}

@keyframes quiz-result-enter {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes quiz-stat-rise {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes quiz-finale-spark {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.4); }
  20% { opacity: 1; }
  100% { opacity: 0; transform: translate(calc(-50% + var(--x)), calc(-50% + var(--y))) scale(1.1); }
}

@media (max-width: 560px) {
  .app-header {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-sm);
  }

  .app-header__actions {
    max-width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .app-main {
    padding: var(--space-md) var(--space-sm);
  }

  .tts-settings__filters {
    grid-template-columns: 1fr;
  }

  .tts-settings__row {
    flex-direction: column;
  }

  .tts-settings__row .btn {
    justify-content: center;
    width: 100%;
  }

  .card-flip__inner,
  .card-flip__front,
  .card-flip__back {
    min-height: 220px;
  }

  .card-flip__text--short {
    font-size: var(--text-2xl);
  }

  .card-flip__text--medium {
    font-size: var(--text-xl);
  }

  .quiz-progress__meta,
  .quiz-progress__energy,
  .quiz-results__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .quiz-actions .btn,
  .quiz-results__actions .btn {
    width: 100%;
    justify-content: center;
  }

  .quiz-feedback {
    max-width: calc(100vw - 48px);
    font-size: var(--text-sm);
  }

  .quiz-detail__item {
    grid-template-columns: auto 1fr;
  }

  .quiz-detail__sep {
    display: none;
  }

  .theme-graph__cols,
  .theme-graph-modal__header {
    align-items: stretch;
    flex-direction: column;
  }

  .theme-graph__col {
    max-height: min(220px, 30vh);
  }

  .theme-graph-stage {
    min-height: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card-flip,
  .card-flip__inner,
  .card-flip--wrong,
  .quiz-feedback,
  .quiz-spark,
  .quiz-streak--hot,
  .quiz-results,
  .stat,
  .quiz-finale__spark,
  .progress-bar__fill {
    animation: none;
    transition: none;
  }

  .quiz-feedback {
    opacity: 1;
    transform: translate(-50%, -30%);
  }
}

/* ── Dedup Modal ── */

.dd-modal {
  max-width: 560px;
}

.dd-modal h3 {
  margin-bottom: var(--space-xs);
}

.dd-conflicts {
  max-height: 400px;
  overflow-y: auto;
  margin: var(--space-md) 0;
}

.dd-conflict {
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
}

.dd-conflict__sidea {
  font-size: var(--text-sm);
  margin-bottom: var(--space-xs);
}

.dd-conflict__pair {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.dd-card {
  flex: 1;
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--color-bg-tertiary);
  font-size: var(--text-sm);
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-wrap;
}

.dd-card__tag {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: var(--text-xs);
  margin-right: var(--space-xs);
}