/* ==========================================================================
   R2Art JSON Diff — Diff Visualizer Styles
   ========================================================================== */

.diff-output-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* 1. Side-by-Side Split Diff View */
.split-diff-container {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}

.diff-column {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border-color);
}

.diff-column:last-child {
  border-right: none;
}

.diff-column-header {
  height: 32px;
  background-color: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justifyContent: space-between;
  padding: 0 0.85rem;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.diff-scroll-body {
  flex: 1;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
}

.diff-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.diff-row {
  height: 22px;
}

.diff-line-num {
  width: 44px;
  min-width: 44px;
  padding: 0 6px;
  text-align: right;
  color: var(--text-muted);
  user-select: none;
  background-color: var(--bg-surface-elevated);
  border-right: 1px solid var(--border-subtle);
  font-size: 0.75rem;
}

.diff-line-sign {
  width: 18px;
  min-width: 18px;
  text-align: center;
  user-select: none;
  font-weight: bold;
}

.diff-line-content {
  padding: 0 8px;
  white-space: pre;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

/* Row states */
.diff-row.row-added {
  background-color: var(--diff-added-bg);
}
.diff-row.row-added .diff-line-sign {
  color: var(--diff-added-text);
}
.diff-row.row-added .diff-line-content {
  color: var(--diff-added-text);
  font-weight: 600;
}

.diff-row.row-removed {
  background-color: var(--diff-removed-bg);
}
.diff-row.row-removed .diff-line-sign {
  color: var(--diff-removed-text);
}
.diff-row.row-removed .diff-line-content {
  color: var(--diff-removed-text);
  font-weight: 600;
}

.diff-row.row-modified {
  background-color: var(--diff-modified-bg);
}
.diff-row.row-modified .diff-line-sign {
  color: var(--diff-modified-text);
}
.diff-row.row-modified .diff-line-content {
  color: var(--diff-modified-text);
  font-weight: 600;
}

.diff-row.row-empty {
  background-color: var(--bg-surface-alt);
}
.diff-row.row-empty .diff-line-num {
  background-color: var(--bg-surface-alt);
}

/* 2. Unified Diff View */
.unified-diff-container {
  flex: 1;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
}

.unified-row {
  display: flex;
  align-items: center;
  min-width: fit-content;
  border-bottom: 1px solid transparent;
}

.unified-num-old, .unified-num-new {
  width: 44px;
  min-width: 44px;
  padding: 0 6px;
  text-align: right;
  color: var(--text-muted);
  user-select: none;
  background-color: var(--bg-surface-elevated);
  border-right: 1px solid var(--border-subtle);
  font-size: 0.75rem;
}

.unified-sign {
  width: 22px;
  min-width: 22px;
  text-align: center;
  font-weight: bold;
  user-select: none;
}

.unified-content {
  padding: 0 8px;
  white-space: pre;
  flex: 1;
}

.unified-row.row-added {
  background-color: var(--diff-added-bg);
  color: var(--diff-added-text);
}
.unified-row.row-added .unified-sign {
  color: var(--diff-added-text);
}

.unified-row.row-removed {
  background-color: var(--diff-removed-bg);
  color: var(--diff-removed-text);
}
.unified-row.row-removed .unified-sign {
  color: var(--diff-removed-text);
}

.unified-row.row-modified {
  background-color: var(--diff-modified-bg);
  color: var(--diff-modified-text);
}
.unified-row.row-modified .unified-sign {
  color: var(--diff-modified-text);
}

/* 3. Tree / Semantic Delta View */
.tree-diff-container {
  flex: 1;
  overflow: auto;
  padding: 0.85rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.tree-node-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  margin-bottom: 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.tree-node-item:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-surface-elevated);
}

.tree-node-idx {
  color: var(--text-muted);
  font-size: 0.72rem;
  min-width: 22px;
  user-select: none;
}

.tree-node-path {
  font-weight: 700;
  color: var(--text-primary);
  min-width: 200px;
  max-width: 320px;
  word-break: break-word;
  background-color: var(--bg-surface-alt);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
}

.tree-node-change {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tree-val-old {
  color: var(--diff-removed-text);
  background-color: var(--diff-removed-bg);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  text-decoration: line-through;
  word-break: break-all;
  border: 1px solid var(--diff-removed-border);
}

.tree-val-arrow {
  color: var(--text-muted);
  font-weight: bold;
}

.tree-val-new {
  color: var(--diff-added-text);
  background-color: var(--diff-added-bg);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-weight: 600;
  word-break: break-all;
  border: 1px solid var(--diff-added-border);
}

.btn-copy-path {
  opacity: 0;
  transition: opacity var(--transition-fast);
  margin-left: auto;
}

.tree-node-item:hover .btn-copy-path {
  opacity: 1;
}

/* Empty or identical state */
.diff-identical-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  gap: 10px;
}

.diff-identical-icon {
  font-size: 36px;
  color: var(--diff-added-text);
}

.diff-identical-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}