/* Tool-specific: Diff Checker */

/* ---- Options row --------------------------------------------------------- */

.diff-options-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.diff-fieldset {
  border: none;
  padding: 0;
  margin: 0;
  min-width: 10rem;
}

.diff-fieldset legend {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.option--radio {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

/* ---- Two-pane input layout ----------------------------------------------- */

.diff-input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

@media (max-width: 640px) {
  .diff-input-row {
    grid-template-columns: 1fr;
  }
}

.diff-input-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.diff-input-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.diff-textarea {
  width: 100%;
  min-height: 12rem;
  resize: vertical;
  font-family: var(--font-mono, monospace);
  font-size: 0.875rem;
  line-height: 1.5;
  padding: var(--space-3);
  background: var(--color-bg);
  color: var(--color-ink);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-2);
  box-sizing: border-box;
}

.diff-textarea:focus {
  outline: 2px solid var(--color-signal);
  outline-offset: 1px;
  border-color: var(--color-signal);
}

/* ---- Summary strip ------------------------------------------------------- */

.diff-summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

@media (max-width: 480px) {
  .diff-summary-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

.diff-summary-tile {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-2);
}

.diff-summary-tile--added {
  border-left: 3px solid var(--color-success);
}

.diff-summary-tile--removed {
  border-left: 3px solid var(--color-danger);
}

.diff-summary-tile__label {
  font-size: 0.75rem;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.diff-summary-tile__value {
  font-family: var(--font-mono, monospace);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1;
}

/* ---- Patch filename row -------------------------------------------------- */

.patch-filename-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-3);
}

.patch-filename-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.patch-filename-input {
  font-family: var(--font-mono, monospace);
  font-size: 0.875rem;
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg);
  color: var(--color-ink);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-2);
  width: 14rem;
  max-width: 100%;
}

.patch-filename-input:focus {
  outline: 2px solid var(--color-signal);
  outline-offset: 1px;
  border-color: var(--color-signal);
}

/* ---- Diff output --------------------------------------------------------- */

.diff-output {
  font-family: var(--font-mono, monospace);
  font-size: 0.875rem;
  line-height: 1.6;
  overflow-x: auto;
}

/* Side-by-side: two-column grid with aligned rows */
.diff-side-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.diff-side-table td {
  width: 50%;
  vertical-align: top;
  padding: 0.125rem var(--space-3);
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-side-table .diff-row--added td.diff-cell--right {
  background: var(--color-success-soft);
  color: var(--color-ink);
}

.diff-side-table .diff-row--removed td.diff-cell--left {
  background: var(--color-danger-soft);
  color: var(--color-ink);
}

.diff-side-table .diff-row--equal td {
  background: var(--color-bg);
}

/* Unified view: single column with prefix glyph */
.diff-unified-line {
  display: block;
  padding: 0.1rem var(--space-2);
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-unified-line--added {
  background: var(--color-success-soft);
  color: var(--color-ink);
}

.diff-unified-line--removed {
  background: var(--color-danger-soft);
  color: var(--color-ink);
}

.diff-unified-line--equal {
  color: var(--color-ink-muted);
}

/* Inline view: mixed additions + deletions in document order */
.diff-inline-block {
  padding: var(--space-3);
  white-space: pre-wrap;
  word-break: break-all;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-2);
}

.diff-inline-added {
  background: var(--color-success-soft);
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-success);
}

.diff-inline-removed {
  background: var(--color-danger-soft);
  color: var(--color-ink);
  text-decoration: line-through;
  text-decoration-color: var(--color-danger);
}