/* DIFF VIEWER */

.diff-input__textarea {
  width: 100%;
  flex: 1;
  resize: none;
  border: none;
  outline: none;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-mono-size);
  line-height: var(--text-mono-lh);
  color: var(--color-ink);
  background: var(--color-surface-1);
  tab-size: 2;
}
.diff-input__textarea::placeholder {
  color: var(--color-ink-subdued);
}

/* VIEW MODE TABS */
.diff-tab {
  display: flex;
  gap: var(--space-1);
}
.diff-tab__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 28px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-1);
  color: var(--color-ink-muted);
  font-family: var(--font-base);
  font-size: var(--text-caption-size);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--motion-fast), color var(--motion-fast), border-color var(--motion-fast);
}
.diff-tab__btn:hover {
  background: var(--color-surface-2);
  color: var(--color-ink);
}
.diff-tab__btn[aria-pressed="true"] {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}
.diff-tab__btn svg {
  width: 14px;
  height: 14px;
}

/* STATS BAR */
.diff-stats {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  font-size: var(--text-caption-size);
  color: var(--color-ink-muted);
  flex-wrap: wrap;
}
.diff-stats__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-weight: 600;
}
.diff-stats__item--add {
  color: var(--color-success);
}
.diff-stats__item--del {
  color: var(--color-danger);
}
.diff-stats__item--mod {
  color: #986F0B;
}

/* DIFF OUTPUT */
.diff-output {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: var(--color-surface-1);
  margin-bottom: var(--space-5);
}
.diff-output__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-3);
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
  height: 36px;
  flex-shrink: 0;
}
.diff-output__title {
  font-size: var(--text-caption-size);
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.diff-output__body {
  overflow: auto;
  max-height: 600px;
}

/* UNIFIED VIEW */
.diff-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: var(--text-mono-size);
  line-height: var(--text-mono-lh);
}
.diff-table td {
  padding: 0 var(--space-3);
  vertical-align: top;
  white-space: pre-wrap;
  word-break: break-all;
}
.diff-table__ln {
  width: 1px;
  min-width: 40px;
  text-align: right;
  padding-right: var(--space-2);
  color: var(--color-ink-subdued);
  user-select: none;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface-2);
  font-size: 11px;
}
.diff-table__sign {
  width: 1px;
  min-width: 20px;
  text-align: center;
  color: var(--color-ink-muted);
  user-select: none;
  font-weight: 600;
}
.diff-table__content {
  width: 100%;
}

/* LINE COLORS */
.diff-line--add {
  background: rgba(16, 124, 16, 0.08);
}
.diff-line--add .diff-table__sign {
  color: var(--color-success);
}
.diff-line--del {
  background: rgba(209, 52, 56, 0.08);
}
.diff-line--del .diff-table__sign {
  color: var(--color-danger);
}
.diff-line--mod {
  background: rgba(152, 111, 11, 0.06);
}
.diff-line--ctx {
  background: transparent;
}

/* INLINE HIGHLIGHTS */
.diff-char--add {
  background: rgba(16, 124, 16, 0.22);
  border-radius: 2px;
}
.diff-char--del {
  background: rgba(209, 52, 56, 0.22);
  border-radius: 2px;
}

/* SIDE-BY-SIDE VIEW */
.diff-side {
  display: flex;
  width: 100%;
}
.diff-side__pane {
  flex: 1;
  min-width: 0;
  overflow: auto;
}
.diff-side__pane:first-child {
  border-right: 2px solid var(--color-border);
}
.diff-side__pane .diff-table {
  width: 100%;
}

/* EMPTY STATE */
.diff-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10) var(--space-6);
  color: var(--color-ink-subdued);
  text-align: center;
}
.diff-empty svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  opacity: 0.4;
}
.diff-empty__text {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}
.diff-empty__hint {
  font-size: var(--text-body-size);
  color: var(--color-ink-subdued);
}

/* LINE COUNTER */
.diff-counter {
  font-size: 11px;
  color: var(--color-ink-subdued);
  font-family: var(--font-mono);
}

/* SEPARATOR FOR HUNKS */
.diff-hunk-sep td {
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-ink-subdued);
  font-size: 11px;
  font-style: italic;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .diff-side {
    flex-direction: column;
  }
  .diff-side__pane:first-child {
    border-right: none;
    border-bottom: 2px solid var(--color-border);
  }
  .diff-stats {
    gap: var(--space-2);
  }
}