:root {
  --diff-added-bg: rgba(16, 185, 129, 0.12);
  --diff-added-border: rgba(16, 185, 129, 0.35);
  --diff-removed-bg: rgba(239, 68, 68, 0.12);
  --diff-removed-border: rgba(239, 68, 68, 0.35);
  --diff-same-bg: color-mix(in srgb, var(--surface-2) 82%, transparent);
}

.diff-shell {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 36px;
}

.diff-workbench {
  gap: 20px;
}

.diff-topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.diff-toolbar-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.diff-mode-group,
.diff-actions,
.diff-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.diff-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.diff-check {
  min-height: 56px;
  padding: 0 14px;
}

.editor-grid,
.result-grid,
.summary-grid {
  display: grid;
  gap: 16px;
}

.editor-grid,
.result-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.summary-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.compare-submit-row {
  width: 100%;
}

.compare-btn--wide {
  width: 100%;
  min-height: 60px;
  font-size: 1.05rem;
}

.editor-pane {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.pane-head,
.result-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.pane-head {
  font-weight: 700;
}

.pane-meta,
.summary-label {
  color: var(--muted);
  font-size: 0.9rem;
}

#source-left,
#source-right {
  min-height: 360px;
  resize: vertical;
  font-family: Consolas, "Courier New", monospace !important;
  line-height: 1.6;
}

.diff-summary-card {
  padding: 20px;
  border-radius: 22px;
}

.summary-value {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1;
}

.result-card,
.timeline-card {
  gap: 16px;
}

.result-card h3,
.timeline-card h3 {
  margin: 0;
}

.result-list,
.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.compare-view {
  width: 100%;
}

.compare-view-switch {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.is-hidden {
  display: none;
}

.result-item,
.result-empty {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 14px 16px;
  background: var(--surface-2);
}

.result-item {
  font-family: Consolas, "Courier New", monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.result-item--added {
  background: var(--diff-added-bg);
  border-color: var(--diff-added-border);
}

.result-item--removed {
  background: var(--diff-removed-bg);
  border-color: var(--diff-removed-border);
}

.timeline-list {
  gap: 0;
}

.unified-diff-shell {
  border: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
  border-radius: 20px;
  overflow: hidden;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--surface) 92%, #0b1220 8%) 0, color-mix(in srgb, var(--surface) 92%, #0b1220 8%) 108px, var(--surface) 108px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.unified-diff-header {
  display: grid;
  grid-template-columns: 54px 54px 32px minmax(0, 1fr);
  min-height: 36px;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 84%, transparent);
}

.unified-diff-head {
  display: block;
}

.unified-diff-body {
  display: flex;
  flex-direction: column;
}

.unified-row {
  display: grid;
  grid-template-columns: 54px 54px 32px minmax(0, 1fr);
  min-height: 34px;
  border-top: 1px solid color-mix(in srgb, var(--border) 68%, transparent);
}

.unified-row:first-child {
  border-top: none;
}

.unified-row--same {
  background: color-mix(in srgb, var(--surface) 90%, transparent);
}

.unified-row--removed {
  background: linear-gradient(90deg, rgba(127, 29, 29, 0.18) 0, rgba(127, 29, 29, 0.18) 140px, rgba(239, 68, 68, 0.09) 140px);
}

.unified-row--added {
  background: linear-gradient(90deg, rgba(6, 78, 59, 0.18) 0, rgba(6, 78, 59, 0.18) 140px, rgba(16, 185, 129, 0.09) 140px);
}

.unified-gutter,
.unified-marker,
.unified-code {
  padding: 8px 10px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.93rem;
  line-height: 1.55;
}

.unified-gutter {
  color: var(--muted);
  text-align: right;
  user-select: none;
}

.unified-marker {
  text-align: center;
  font-weight: 700;
  user-select: none;
}

.unified-marker--removed {
  color: #f87171;
}

.unified-marker--added {
  color: #34d399;
}

.unified-marker--same {
  color: transparent;
}

.unified-code {
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}

.inline-change {
  border-radius: 6px;
  padding: 0 1px;
}

.inline-change--removed {
  background: rgba(239, 68, 68, 0.22);
  color: #fecaca;
}

.inline-change--added {
  background: rgba(16, 185, 129, 0.22);
  color: #bbf7d0;
}

.result-grid--secondary {
  align-items: start;
}

.split-diff-shell {
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  background: var(--surface-2);
}

.split-diff-header,
.split-diff-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.split-diff-header {
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border-bottom: 1px solid var(--border);
}

.split-diff-head-cell {
  padding: 14px 18px;
  font-weight: 700;
}

.split-diff-head-cell + .split-diff-head-cell,
.split-diff-cell + .split-diff-cell {
  border-left: 1px solid var(--border);
}

.split-diff-list {
  display: flex;
  flex-direction: column;
}

.split-diff-row + .split-diff-row {
  border-top: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
}

.split-diff-cell {
  min-height: 54px;
  padding: 12px 16px;
  font-family: Consolas, "Courier New", monospace;
  background: var(--surface);
}

.split-diff-cell--same {
  background: var(--diff-same-bg);
}

.split-diff-cell--added {
  background: var(--diff-added-bg);
}

.split-diff-cell--removed {
  background: var(--diff-removed-bg);
}

.split-diff-line {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
}

.split-diff-number {
  min-width: 2.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
}

.split-diff-content {
  white-space: pre-wrap;
  word-break: break-word;
}

.split-diff-cell--empty .split-diff-number,
.split-diff-cell--empty .split-diff-content {
  opacity: 0.34;
}

.result-empty {
  color: var(--muted);
}

.diff-blank {
  display: inline-block;
  min-width: 1.5rem;
  opacity: 0.45;
}

@media (max-width: 980px) {
  .editor-grid,
  .result-grid,
  .summary-grid,
  .diff-options {
    grid-template-columns: 1fr;
  }

  .split-diff-header,
  .split-diff-row {
    grid-template-columns: 1fr;
  }

  .split-diff-head-cell + .split-diff-head-cell,
  .split-diff-cell + .split-diff-cell {
    border-left: none;
    border-top: 1px solid var(--border);
  }

  #source-left,
  #source-right {
    min-height: 260px;
  }

  .unified-diff-header,
  .unified-row {
    grid-template-columns: 44px 44px 26px minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .diff-actions {
    width: 100%;
  }

  .diff-actions > button {
    flex: 1 1 calc(50% - 6px);
  }

  .result-card-head > button {
    width: 100%;
  }

  .diff-toolbar-group {
    width: 100%;
  }
}