/* CHECKBOX */
.checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--text-caption-size);
  color: var(--color-ink);
  user-select: none;
}
.checkbox input {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* MODE TOGGLE (segmented button group) */
.mode-toggle {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  height: 24px;
}
.mode-toggle__btn {
  padding: 0 var(--space-3);
  cursor: pointer;
  color: var(--color-ink-muted);
  font-family: var(--font-base);
  font-size: 11px;
  font-weight: 400;
  background: var(--color-surface-1);
  border: none;
  border-right: 1px solid var(--color-border);
  transition: background var(--motion-fast) var(--motion-easing),
              color var(--motion-fast) var(--motion-easing);
  line-height: 1;
  display: inline-flex;
  align-items: center;
}
.mode-toggle__btn:last-child {
  border-right: none;
}
.mode-toggle__btn:hover {
  background: var(--color-surface-2);
  color: var(--color-ink);
}
.mode-toggle__btn[aria-pressed="true"] {
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 600;
}

/* EDITOR */
.editor {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}
.editor--dragover::after {
  content: 'Drop JSON file here';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 120, 212, 0.08);
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  z-index: 10;
  pointer-events: none;
}

.editor__gutter {
  width: 48px;
  flex-shrink: 0;
  overflow: hidden;
  background: var(--color-surface-2);
  border-right: 1px solid var(--color-border);
  padding: var(--space-3) 0;
  user-select: none;
}
.editor__gutter-line {
  height: calc(var(--text-mono-size) * 1.5);
  padding: 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-mono-size);
  line-height: 1.5;
  color: var(--color-ink-subdued);
  text-align: right;
}
.editor__gutter-line--error {
  background: rgba(209, 52, 56, 0.12);
  color: var(--color-danger);
  font-weight: 600;
}

.editor__textarea {
  flex: 1;
  resize: none;
  border: none;
  outline: none;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-mono-size);
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-surface-1);
  white-space: pre;
  overflow-wrap: normal;
  overflow-x: auto;
  overflow-y: auto;
  tab-size: 2;
}
.editor__textarea::placeholder {
  color: var(--color-ink-subdued);
}

/* TAB BAR */
.tab-bar {
  display: flex;
  align-items: center;
  position: relative;
  gap: var(--space-1);
}
.tab-bar__tab {
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-base);
  font-size: var(--text-caption-size);
  font-weight: 400;
  color: var(--color-ink-muted);
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  transition: color var(--motion-fast);
  display: flex;
  align-items: center;
}
.tab-bar__tab:hover {
  color: var(--color-ink);
}
.tab-bar__tab--active {
  color: var(--color-primary);
  font-weight: 600;
}
.tab-bar__tab--active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-3);
  right: var(--space-3);
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px 1px 0 0;
}

/* OUTPUT PANEL */
.output-panel {
  flex: 1;
  overflow: auto;
  position: relative;
}
.output-panel__code {
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-mono-size);
  line-height: 1.5;
  color: var(--color-ink);
  white-space: pre;
  overflow-x: auto;
  margin: 0;
  min-height: 100%;
}
.output-panel__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 200px;
  color: var(--color-ink-subdued);
  text-align: center;
  padding: var(--space-6);
  gap: var(--space-3);
}
.output-panel__empty-icon {
  width: 48px;
  height: 48px;
  color: var(--color-border);
}
.output-panel__empty-text {
  font-size: var(--text-body-size);
  color: var(--color-ink-muted);
}

/* TREE VIEW */
.tree-view {
  flex: 1;
  overflow: auto;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-mono-size);
  line-height: 1.5;
}
.tree-view__controls {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.tree-view__warning {
  padding: var(--space-4);
  color: var(--color-ink-muted);
  font-family: var(--font-base);
  font-size: var(--text-body-size);
}

.tree-node {
  position: relative;
}
.tree-node__header {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 1px 0;
  cursor: default;
  border-radius: var(--radius-sm);
}
.tree-node__header:hover {
  background: var(--color-surface-2);
}
.tree-node__toggle {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-ink-muted);
  padding: 0;
  flex-shrink: 0;
  transition: transform var(--motion-fast) var(--motion-easing);
  transform: rotate(90deg);
}
.tree-node--collapsed > .tree-node__header .tree-node__toggle {
  transform: rotate(0deg);
}
.tree-node__spacer {
  width: 16px;
  flex-shrink: 0;
}
.tree-node__colon {
  color: var(--color-ink-muted);
}
.tree-node__summary {
  color: var(--color-ink-subdued);
  font-size: var(--text-mono-size);
}
.tree-node__type {
  margin-left: var(--space-2);
  font-family: var(--font-base);
}
.tree-node__children {
  display: block;
}
.tree-node--collapsed > .tree-node__children {
  display: none;
}

/* STATS PANEL */
.stats-panel {
  flex: 1;
  overflow: auto;
  padding: var(--space-4);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-3);
}
.stat-card {
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  text-align: center;
}
.stat-card__value {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}
.stat-card__label {
  font-size: var(--text-caption-size);
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stats-breakdown {
  margin-top: var(--space-5);
}
.stats-breakdown__title {
  font-size: var(--text-body-size);
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.stats-breakdown__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-body-size);
}
.stats-breakdown__row:last-child {
  border-bottom: none;
}
.stats-breakdown__label {
  color: var(--color-ink-muted);
}
.stats-breakdown__value {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: var(--text-mono-size);
}

/* STATUS BAR */
.status-bar {
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  gap: var(--space-4);
  font-size: var(--text-caption-size);
  color: var(--color-ink-muted);
  flex-shrink: 0;
  margin-bottom: var(--space-9);
}
.status-bar__item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  white-space: nowrap;
}
.status-bar__item svg {
  width: 14px;
  height: 14px;
}
.status-bar__validity--valid {
  color: var(--color-success);
}
.status-bar__validity--invalid {
  color: var(--color-danger);
}
.status-bar__validity--empty {
  color: var(--color-ink-subdued);
}
.status-bar__spacer {
  flex: 1;
}

/* MODAL */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.modal--open {
  display: flex;
}
.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
}
.modal__dialog {
  position: relative;
  background: var(--color-surface-1);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-flyout);
  padding: var(--space-6);
  max-width: 480px;
  width: calc(100% - var(--space-8));
}
.modal__title {
  font-size: var(--text-heading-size);
  font-weight: var(--text-heading-weight);
  margin-bottom: var(--space-4);
}
.modal__input {
  width: 100%;
  height: 36px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-base);
  font-size: var(--text-body-size);
  color: var(--color-ink);
  background: var(--color-surface-1);
  margin-bottom: var(--space-4);
  transition: border-color var(--motion-fast);
}
.modal__input:focus {
  outline: none;
  border-color: var(--color-primary);
  border-bottom-width: 2px;
}
.modal__input::placeholder {
  color: var(--color-ink-subdued);
}
.modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* SYNTAX HIGHLIGHTING */
.sh-key { color: #0451A5; }
.sh-string { color: #107C10; }
.sh-number { color: #0078D4; }
.sh-boolean { color: #B5461E; }
.sh-null { color: #A19F9D; font-style: italic; }

/* RESPONSIVE */
@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .status-bar__cursor,
  .status-bar__size {
    display: none;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}