/* Test Dossier — Diff viewer styles.
 *
 * Class contract is documented in public/scripts/diff.js. The renderers
 * emit pure DOM (no innerHTML) so these styles are the only hook between
 * engine output and visual presentation.
 *
 * Loaded by:
 *   - public/app/index.html (in-app Diff tool panel + History compare)
 *   - public/s.html         (renders kind="diff" shares)
 *
 * Token expectations (consumer page must define):
 *   --bg, --surface, --surface-2, --panel, --border
 *   --text, --text-2, --text-3
 *   --success, --danger, --warning, --accent, --accent-soft
 *   --font-mono (optional; falls back to a system stack)
 *   --r-sm (used elsewhere; not strictly required here)
 */

.tj-diff {
  font-family: var(--font-mono, ui-monospace, "SF Mono", Menlo, Consolas, monospace);
  font-size: 12px;
  line-height: 1.55;
  background: var(--panel);
  color: var(--text);
}
.tj-diff__empty {
  padding: 32px 16px;
  text-align: center;
  color: var(--text-3);
  font-family: var(--font);
  font-size: 13px;
}
.tj-diff__hunk-sep {
  padding: 6px 12px;
  background: var(--surface-2);
  color: var(--text-3);
  font-size: 11px;
  text-align: center;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* Split-view: two columns side by side. Each row pairs left + right
   cells; equal/add/remove/change drives the row background. */
.tj-diff--split .tj-diff__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 35%, transparent);
}
.tj-diff--split .tj-diff__cell {
  padding: 2px 12px;
  overflow-x: auto;
  border-right: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
  white-space: pre-wrap;
  word-break: break-word;
}
.tj-diff--split .tj-diff__cell--b { border-right: none; }
.tj-diff--split .tj-diff__row--equal { background: transparent; }
.tj-diff--split .tj-diff__row--add .tj-diff__cell--b,
.tj-diff--split .tj-diff__row--remove .tj-diff__cell--a,
.tj-diff--split .tj-diff__row--change .tj-diff__cell {
  background: color-mix(in srgb, currentColor 0%, transparent);
}
.tj-diff--split .tj-diff__row--add .tj-diff__cell--b {
  background: color-mix(in srgb, var(--success) 14%, var(--panel));
}
.tj-diff--split .tj-diff__row--add .tj-diff__cell--a {
  background: color-mix(in srgb, var(--surface-2) 70%, transparent);
}
.tj-diff--split .tj-diff__row--remove .tj-diff__cell--a {
  background: color-mix(in srgb, var(--danger) 14%, var(--panel));
}
.tj-diff--split .tj-diff__row--remove .tj-diff__cell--b {
  background: color-mix(in srgb, var(--surface-2) 70%, transparent);
}
.tj-diff--split .tj-diff__row--change .tj-diff__cell--a {
  background: color-mix(in srgb, var(--danger) 8%, var(--panel));
}
.tj-diff--split .tj-diff__row--change .tj-diff__cell--b {
  background: color-mix(in srgb, var(--success) 8%, var(--panel));
}

/* Unified-view: single column with sigil + line numbers. */
.tj-diff--unified .tj-diff__row {
  display: grid;
  grid-template-columns: 44px 44px 16px 1fr;
  align-items: start;
}
.tj-diff--unified .tj-diff__row--add { background: color-mix(in srgb, var(--success) 12%, var(--panel)); }
.tj-diff--unified .tj-diff__row--remove { background: color-mix(in srgb, var(--danger) 12%, var(--panel)); }
.tj-diff--unified .tj-diff__sigil {
  text-align: center;
  color: var(--text-3);
  user-select: none;
  padding: 0 4px;
}
.tj-diff--unified .tj-diff__row--add .tj-diff__sigil { color: var(--success); font-weight: 700; }
.tj-diff--unified .tj-diff__row--remove .tj-diff__sigil { color: var(--danger); font-weight: 700; }
.tj-diff--unified .tj-diff__line {
  white-space: pre-wrap;
  word-break: break-word;
  padding: 0 8px 0 4px;
}

/* Line numbers. Quiet by default; the row colour is what carries meaning. */
.tj-diff__num {
  display: inline-block;
  min-width: 32px;
  padding: 0 8px 0 0;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
  text-align: right;
  user-select: none;
  border-right: 1px solid color-mix(in srgb, var(--border) 40%, transparent);
  margin-right: 8px;
}
.tj-diff__line { display: inline; }

/* Word-level highlights inside paired change rows — strong contrast so
   the eye lands on what actually changed. */
.tj-diff__word--add {
  background: color-mix(in srgb, var(--success) 35%, transparent);
  border-radius: 2px;
  padding: 0 1px;
}
.tj-diff__word--remove {
  background: color-mix(in srgb, var(--danger) 35%, transparent);
  border-radius: 2px;
  padding: 0 1px;
  text-decoration: line-through;
  text-decoration-color: color-mix(in srgb, var(--danger) 60%, transparent);
}