/* ====== 文本差异对比 - 专属样式 ====== */

/* ----- 双栏输入区 ----- */
.diff-inputs {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  align-items: stretch;
}

.diff-input-col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.diff-input-swap-col {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding-top: 28px;
}

.diff-input-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.diff-input-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.diff-input-actions {
  display: flex;
  gap: var(--space-1);
}

.diff-input-col textarea {
  width: 100%;
  min-height: 140px;
  flex: 1;
  box-sizing: border-box;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  resize: vertical;
}

.diff-input-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ----- 示例下拉菜单 ----- */
.dropdown-wrap {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  min-width: 150px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  z-index: 100;
  padding: 4px 0;
}

.dropdown-menu.open {
  display: block;
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  font-family: var(--font-sans);
  transition: background var(--duration-fast) var(--ease-default);
}

.dropdown-item:hover {
  background: var(--color-surface);
}

/* ----- 选项栏 ----- */
.diff-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}

.diff-options-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.diff-option-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

/* ----- 输出区头部：视图切换 + 统计 + 操作 ----- */
.diff-output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.diff-view-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
}

.diff-view-tabs .hash-tab {
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color var(--duration-normal) var(--ease-default), border-color var(--duration-normal) var(--ease-default);
  outline: none;
}

.diff-view-tabs .hash-tab:hover {
  color: var(--color-text);
}

.diff-view-tabs .hash-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.diff-stats {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-sm);
}

.diff-stats .stat-add {
  color: var(--color-success);
  font-weight: 500;
}

.diff-stats .stat-del {
  color: var(--color-error);
  font-weight: 500;
}

.diff-stats .stat-mod {
  color: #d97706;
  font-weight: 500;
}

.diff-output-actions {
  display: flex;
  gap: var(--space-2);
}

/* ----- 差异输出区 ----- */
.diff-output {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.diff-empty {
  padding: var(--space-12) var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  display: none;
}

/* ----- 并排视图 ----- */
.diff-side-by-side {
  display: flex;
  overflow: hidden;
}

.diff-side-panel {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
  max-height: 600px;
  border-right: 1px solid var(--color-border);
}

.diff-side-panel:last-child {
  border-right: none;
}

/* 同步滚动容器 */
.diff-side-panel::-webkit-scrollbar {
  width: 6px;
}

.diff-side-panel::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

/* ----- 单行 ----- */
.diff-line {
  display: flex;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  min-height: 21px;
  white-space: pre;
  border-bottom: 1px solid rgba(0,0,0,0.03);
}

.diff-line-num {
  flex-shrink: 0;
  width: 48px;
  text-align: right;
  padding: 0 var(--space-2);
  color: var(--color-text-muted);
  user-select: none;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
}

.diff-line-content {
  flex: 1;
  padding: 0 var(--space-2);
  overflow: hidden;
}

/* 行级状态 */
.diff-line.ctx .diff-line-content {
  background: transparent;
}

.diff-line.del {
  background: rgba(220, 38, 38, 0.08);
}

.diff-line.del .diff-line-num {
  background: rgba(220, 38, 38, 0.12);
  color: var(--color-error);
}

.diff-line.del .diff-line-content {
  background: rgba(220, 38, 38, 0.06);
}

.diff-line.add {
  background: rgba(5, 150, 105, 0.08);
}

.diff-line.add .diff-line-num {
  background: rgba(5, 150, 105, 0.12);
  color: var(--color-success);
}

.diff-line.add .diff-line-content {
  background: rgba(5, 150, 105, 0.06);
}

/* 占位行（对齐用） */
.diff-line.placeholder {
  background: var(--color-surface);
}

.diff-line.placeholder .diff-line-content {
  color: transparent;
}

/* ----- 词级高亮（在行内容内） ----- */
.diff-word-del {
  background: rgba(220, 38, 38, 0.18);
  border-radius: 2px;
  padding: 0 1px;
  text-decoration: line-through;
}

.diff-word-add {
  background: rgba(5, 150, 105, 0.18);
  border-radius: 2px;
  padding: 0 1px;
}

/* ----- 统一视图 ----- */
.diff-unified {
  max-height: 600px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

.diff-unified .diff-line-header {
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  border-bottom: 1px solid var(--color-border);
  font-weight: 500;
}

.diff-unified .diff-line.ctx {
  background: transparent;
  color: var(--color-text);
}

.diff-unified .diff-line.del {
  background: rgba(220, 38, 38, 0.06);
  color: var(--color-error);
}

.diff-unified .diff-line.del::before {
  content: '-';
  width: 20px;
  flex-shrink: 0;
  display: inline-block;
  text-align: center;
  font-weight: 700;
  margin-right: var(--space-2);
}

.diff-unified .diff-line.add {
  background: rgba(5, 150, 105, 0.06);
  color: var(--color-success);
}

.diff-unified .diff-line.add::before {
  content: '+';
  width: 20px;
  flex-shrink: 0;
  display: inline-block;
  text-align: center;
  font-weight: 700;
  margin-right: var(--space-2);
}

.diff-unified .diff-line.ctx::before {
  content: '';
  width: 20px;
  flex-shrink: 0;
  display: inline-block;
  margin-right: var(--space-2);
}

/* ----- 工具描述 + FAQ 同容器宽度 ----- */
.tool-header .tool-desc {
  max-width: none;
}

.faq-section {
  max-width: none;
}

/* ----- 差异导航条 ----- */
.diff-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) 0;
  margin-bottom: var(--space-3);
  gap: var(--space-3);
}

.diff-nav-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.diff-nav-counter {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  min-width: 64px;
  text-align: center;
  user-select: none;
}

.diff-nav-counter .current {
  font-weight: 600;
  color: var(--color-text);
}

/* ----- 上下文折叠 ----- */
.diff-fold-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  user-select: none;
  transition: background var(--duration-normal) var(--ease-default), color var(--duration-normal) var(--ease-default);
  gap: var(--space-1);
}

.diff-fold-bar:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--color-text);
}

.diff-fold-bar::before {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid currentColor;
  transition: transform var(--duration-normal) var(--ease-default);
  margin-right: 2px;
}

.diff-foldable.folded .diff-fold-bar::before {
  transform: rotate(-90deg);
}

.diff-foldable .diff-line {
  display: flex;
}

.diff-foldable.folded .diff-line {
  display: none;
}

/* ----- 跳转高亮闪烁 ----- */
.diff-line.jump-flash {
  animation: diff-jump-flash 0.6s ease-out;
}

@keyframes diff-jump-flash {
  0%   { background-color: rgba(59, 130, 246, 0.25); }
  100% { background-color: transparent; }
}

.diff-line.del.jump-flash {
  animation: diff-jump-flash-del 0.6s ease-out;
}

@keyframes diff-jump-flash-del {
  0%   { background-color: rgba(220, 38, 38, 0.28); }
  100% { background-color: rgba(220, 38, 38, 0.08); }
}

.diff-line.add.jump-flash {
  animation: diff-jump-flash-add 0.6s ease-out;
}

@keyframes diff-jump-flash-add {
  0%   { background-color: rgba(5, 150, 105, 0.28); }
  100% { background-color: rgba(5, 150, 105, 0.08); }
}

/* ----- 键盘快捷键提示 ----- */
.kbd-shortcuts {
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.kbd-shortcuts-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.kbd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-1) var(--space-4);
}

.kbd-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-text);
  padding: 2px 0;
}

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 20px;
  padding: 0 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
  line-height: 1;
  white-space: nowrap;
}

.kbd + .kbd {
  margin-left: 2px;
}

/* ----- 内联视图 ----- */
.diff-inline {
  max-height: 600px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

.diff-inline .diff-line.ctx {
  background: transparent;
  color: var(--color-text);
}

.diff-inline .diff-line.del {
  background: rgba(220, 38, 38, 0.06);
  color: var(--color-error);
}

.diff-inline .diff-line.add {
  background: rgba(5, 150, 105, 0.06);
  color: var(--color-success);
}

.diff-inline .diff-line.modify {
  background: rgba(217, 119, 6, 0.06);
}

/* ----- 相似度 ----- */
.stat-sim {
  font-weight: 500;
}

.stat-sim-high {
  color: var(--color-success);
}

.stat-sim-low {
  color: #d97706;
}

/* ----- 正则忽略输入 ----- */
.diff-opt-regex {
  display: inline-flex !important;
  align-items: center;
  gap: var(--space-1);
}

.regex-input {
  width: 140px;
  height: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  background: var(--color-card);
  color: var(--color-text);
}

.regex-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-bg);
}

.regex-input.error {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

.regex-input:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ----- 语言选择器 ----- */
.diff-output-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.lang-select {
  height: 28px;
  font-size: var(--text-xs);
  padding: 0 var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-card);
  color: var(--color-text);
  cursor: pointer;
  outline: none;
  font-family: var(--font-sans);
}

.lang-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-bg);
}

/* ----- 语法高亮颜色（浅色） ----- */
.diff-line-content .syn-kw   { color: #7C3AED; font-weight: 500; }
.diff-line-content .syn-str  { color: #059669; }
.diff-line-content .syn-cmt  { color: #9CA3AF; font-style: italic; }
.diff-line-content .syn-num  { color: #D97706; }
.diff-line-content .syn-tag  { color: #DC2626; }
.diff-line-content .syn-attr { color: #7C3AED; }
.diff-line-content .syn-dec  { color: #0891B2; }
.diff-line-content .syn-val  { color: #2563EB; }
.diff-line-content .syn-var  { color: #D97706; }
.diff-line-content .syn-type { color: #0891B2; }

@media (prefers-color-scheme: dark) {
  .diff-line-content .syn-kw   { color: #A78BFA; }
  .diff-line-content .syn-str  { color: #34D399; }
  .diff-line-content .syn-cmt  { color: #6B7280; }
  .diff-line-content .syn-num  { color: #FBBF24; }
  .diff-line-content .syn-tag  { color: #F87171; }
  .diff-line-content .syn-attr { color: #A78BFA; }
  .diff-line-content .syn-dec  { color: #22D3EE; }
  .diff-line-content .syn-val  { color: #60A5FA; }
  .diff-line-content .syn-var  { color: #FBBF24; }
  .diff-line-content .syn-type { color: #22D3EE; }
}

/* ----- 自动换行 ----- */
.diff-word-wrap .diff-line {
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-word-wrap .diff-line .diff-line-content {
  overflow: visible;
}

/* ----- 拖拽高亮 ----- */
.diff-input-col {
  transition: box-shadow var(--duration-fast) var(--ease-default);
}

.diff-input-col.drag-over {
  box-shadow: inset 0 0 0 2px var(--color-primary);
  border-radius: var(--radius-sm);
}

.diff-input-col.drag-over textarea {
  background: var(--color-primary-bg);
}

/* ----- 移动端 700px 断点 ----- */
@media (max-width: 700px) {
  .diff-inputs {
    flex-direction: column;
  }

  .diff-input-swap-col {
    padding-top: 0;
    transform: rotate(90deg);
  }

  .diff-options {
    flex-direction: column;
    gap: var(--space-3);
    align-items: flex-start;
  }

  .diff-options-left {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .diff-output-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .diff-side-panel {
    max-height: 400px;
  }

  .diff-line-num {
    width: 36px;
    font-size: 11px;
  }

  .diff-line {
    font-size: 11px;
  }

  .diff-inline {
    max-height: 400px;
    font-size: 11px;
  }
}