/**
 * @fileoverview Diff Viewer styles
 *
 * Styling for the diff viewer modal with split and unified views.
 */

/* ============================================================================
   MODAL OVERLAY
   ============================================================================ */

.wn-diff-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--wn-z-modal-nested);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--wn-backdrop-heavy);
  animation: fadeIn var(--wn-transition-fast) ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ============================================================================
   MODAL CONTAINER
   ============================================================================ */

.wn-diff-modal {
  width: 95%;
  max-width: var(--wn-modal-xl);
  height: 85vh;
  display: flex;
  flex-direction: column;
  border-radius: var(--wn-radius-lg);
  border: 1px solid var(--wn-zinc-700);
  background-color: var(--wn-zinc-900);
  box-shadow: var(--wn-shadow-lg);
  animation: zoomIn var(--wn-transition-fast) ease-out;
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================================================
   HEADER
   ============================================================================ */

.wn-diff-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--wn-space-4) var(--wn-space-5);
  border-bottom: 1px solid var(--wn-zinc-700);
  flex-shrink: 0;
}

.wn-diff-header-left {
  display: flex;
  align-items: center;
  gap: var(--wn-space-5);
}

.wn-diff-title {
  margin: 0;
  font-size: var(--wn-font-base);
  font-weight: 600;
  color: var(--wn-zinc-50);
}

.wn-diff-stats {
  display: flex;
  gap: var(--wn-space-3);
}

.wn-diff-stat {
  padding: var(--wn-space-1) var(--wn-space-3);
  border-radius: var(--wn-radius-sm);
  font-size: var(--wn-font-xs);
  font-weight: 500;
  font-family: ui-monospace, monospace;
}

.wn-diff-stat--added {
  background-color: var(--wn-success-alpha-20);
  color: #4ade80;
}

.wn-diff-stat--removed {
  background-color: var(--wn-error-alpha-20);
  color: var(--wn-error-400);
}

.wn-diff-header-right {
  display: flex;
  align-items: center;
  gap: var(--wn-space-3);
}

.wn-diff-view-toggle {
  display: flex;
  border: 1px solid var(--wn-zinc-700);
  border-radius: var(--wn-radius-sm);
  overflow: hidden;
}

.wn-diff-view-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--wn-icon-btn-lg);
  height: var(--wn-icon-btn-md);
  padding: 0;
  border: none;
  background-color: transparent;
  color: var(--wn-zinc-500);
  cursor: pointer;
  transition:
    background-color var(--wn-transition-fast),
    color var(--wn-transition-fast);
}

.wn-diff-view-btn:hover {
  background-color: var(--wn-overlay-5);
  color: var(--wn-zinc-400);
}

.wn-diff-view-btn--active {
  background-color: var(--wn-brand-alpha-20);
  color: var(--wn-brand-400);
}

.wn-diff-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--wn-icon-btn-lg);
  height: var(--wn-icon-btn-lg);
  padding: 0;
  border: none;
  border-radius: var(--wn-radius-sm);
  background-color: transparent;
  color: var(--wn-zinc-400);
  cursor: pointer;
  transition:
    background-color var(--wn-transition-fast),
    color var(--wn-transition-fast);
}

.wn-diff-close:hover {
  background-color: var(--wn-overlay-10);
  color: var(--wn-zinc-50);
}

/* ============================================================================
   CONTENT
   ============================================================================ */

.wn-diff-content {
  flex: 1;
  overflow: hidden;
}

/* ============================================================================
   SPLIT VIEW
   ============================================================================ */

.wn-diff-split {
  display: flex;
  height: 100%;
}

.wn-diff-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.wn-diff-column:first-child {
  border-right: 1px solid var(--wn-zinc-700);
}

.wn-diff-column-header {
  padding: var(--wn-space-3) var(--wn-space-5);
  border-bottom: 1px solid var(--wn-zinc-700);
  background-color: var(--wn-zinc-950);
  font-size: var(--wn-font-xs);
  font-weight: 500;
  color: var(--wn-zinc-400);
  flex-shrink: 0;
}

.wn-diff-column-content {
  flex: 1;
  overflow-y: auto;
  font-family: ui-monospace, monospace;
  font-size: var(--wn-font-sm);
  line-height: 1.5;
}

/* ============================================================================
   UNIFIED VIEW
   ============================================================================ */

.wn-diff-unified {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.wn-diff-unified-header {
  display: flex;
  align-items: center;
  gap: var(--wn-space-4);
  padding: var(--wn-space-3) var(--wn-space-5);
  border-bottom: 1px solid var(--wn-zinc-700);
  background-color: var(--wn-zinc-950);
  flex-shrink: 0;
}

.wn-diff-unified-label {
  font-size: var(--wn-font-xs);
  font-weight: 500;
}

.wn-diff-unified-label--old {
  color: var(--wn-error-400);
}

.wn-diff-unified-label--new {
  color: #4ade80;
}

.wn-diff-unified-arrow {
  color: var(--wn-zinc-600);
}

.wn-diff-unified-content {
  flex: 1;
  overflow-y: auto;
  font-family: ui-monospace, monospace;
  font-size: var(--wn-font-sm);
  line-height: 1.5;
}

/* ============================================================================
   DIFF LINES
   ============================================================================ */

.wn-diff-line {
  display: flex;
  min-height: 1.5rem;
}

.wn-diff-line--added {
  background-color: var(--wn-success-alpha-15);
}

.wn-diff-line--removed {
  background-color: var(--wn-error-alpha-15);
}

.wn-diff-line--empty {
  background-color: rgba(63, 63, 70, 0.3);
}

.wn-diff-line-num {
  width: var(--wn-space-9);
  padding: 0 var(--wn-space-3);
  text-align: right;
  color: var(--wn-zinc-600);
  background-color: rgba(0, 0, 0, 0.2);
  flex-shrink: 0;
  user-select: none;
}

.wn-diff-unified .wn-diff-line-num {
  width: 2.5rem;
}

.wn-diff-line-content {
  flex: 1;
  padding: 0 var(--wn-space-4);
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--wn-zinc-300);
}

.wn-diff-line--added .wn-diff-line-content {
  color: #4ade80;
}

.wn-diff-line--removed .wn-diff-line-content {
  color: var(--wn-error-400);
}

.wn-diff-line-marker {
  display: inline-block;
  width: var(--wn-space-5);
  font-weight: 600;
}

/* ============================================================================
   LIGHT MODE OVERRIDES
   ============================================================================ */

.wn-light .wn-diff-overlay {
  background-color: rgba(0, 0, 0, 0.6);
}

.wn-light .wn-diff-modal {
  border-color: var(--wn-zinc-200);
  background-color: #fff;
}

.wn-light .wn-diff-header {
  border-bottom-color: var(--wn-zinc-200);
}

.wn-light .wn-diff-title {
  color: var(--wn-zinc-900);
}

.wn-light .wn-diff-stat--added {
  background-color: var(--wn-success-alpha-15);
  color: #16a34a;
}

.wn-light .wn-diff-stat--removed {
  background-color: var(--wn-error-alpha-15);
  color: var(--wn-error-600);
}

.wn-light .wn-diff-view-toggle {
  border-color: var(--wn-zinc-200);
}

.wn-light .wn-diff-view-btn {
  color: var(--wn-zinc-400);
}

.wn-light .wn-diff-view-btn:hover {
  background-color: var(--wn-overlay-light-3);
  color: var(--wn-zinc-500);
}

.wn-light .wn-diff-view-btn--active {
  background-color: var(--wn-brand-alpha-15);
  color: var(--wn-brand-600);
}

.wn-light .wn-diff-close {
  color: var(--wn-zinc-500);
}

.wn-light .wn-diff-close:hover {
  background-color: var(--wn-overlay-light-5);
  color: var(--wn-zinc-900);
}

.wn-light .wn-diff-column:first-child {
  border-right-color: var(--wn-zinc-200);
}

.wn-light .wn-diff-column-header {
  border-bottom-color: var(--wn-zinc-200);
  background-color: var(--wn-zinc-50);
  color: var(--wn-zinc-500);
}

.wn-light .wn-diff-unified-header {
  border-bottom-color: var(--wn-zinc-200);
  background-color: var(--wn-zinc-50);
}

.wn-light .wn-diff-unified-label--old {
  color: var(--wn-error-600);
}

.wn-light .wn-diff-unified-label--new {
  color: #16a34a;
}

.wn-light .wn-diff-unified-arrow {
  color: var(--wn-zinc-400);
}

.wn-light .wn-diff-line--added {
  background-color: var(--wn-success-alpha-10);
}

.wn-light .wn-diff-line--removed {
  background-color: var(--wn-error-alpha-10);
}

.wn-light .wn-diff-line--empty {
  background-color: rgba(228, 228, 231, 0.5);
}

.wn-light .wn-diff-line-num {
  color: var(--wn-zinc-400);
  background-color: var(--wn-overlay-light-3);
}

.wn-light .wn-diff-line-content {
  color: var(--wn-zinc-700);
}

.wn-light .wn-diff-line--added .wn-diff-line-content {
  color: #16a34a;
}

.wn-light .wn-diff-line--removed .wn-diff-line-content {
  color: var(--wn-error-600);
}