:root {
  --zbtool-shell-padding: 10px;
  --zbtool-workspace-gap: 14px;
  --zbtool-lang-min-width: 210px;
  --tool-border: #d8e1ec;
  --tool-surface: #ffffff;
  --tool-muted: #f7faff;
  --tool-accent: #2563eb;
  --tool-danger: #e45a5a;
  --tool-success: #18a06a;
  --tool-warning: #f59e0b;
}

.diff-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.95fr);
  gap: 16px;
}

.diff-stack {
  display: grid;
  gap: 14px;
}

.diff-block {
  padding: 18px;
  border: 1px solid var(--tool-border);
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
}

.section-head {
  margin: 0 0 12px;
  font-size: 16px;
  color: #223147;
}

.editor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.editor-panel {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--tool-border);
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #f9fbff 100%);
}

.editor-panel-left {
  border-color: #bfd0fb;
  background: linear-gradient(180deg, #edf4ff 0%, #fcfdff 100%);
}

.editor-panel-right {
  border-color: #ffd3b2;
  background: linear-gradient(180deg, #fff1e4 0%, #fffdf9 100%);
}

.editor-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.editor-title {
  font-size: 14px;
  color: #55657b;
  font-weight: 700;
}

.editor-panel-left .editor-title {
  color: #2554c7;
}

.editor-panel-right .editor-title {
  color: #c8661c;
}

.editor-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.editor-actions button {
  border: 1px solid #cdd7e3;
  background: #f6f8fb;
  color: #415166;
  border-radius: 10px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
}

.editor-actions label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: 10px;
  border: 1px solid #d6e1ee;
  background: #fff;
  color: #526072;
  font-size: 13px;
}

.editor-box {
  box-sizing: border-box;
  width: 100%;
  min-height: 260px;
  padding: 14px 15px;
  border: 1px solid var(--tool-border);
  border-radius: 16px;
  resize: vertical;
  background: #fff;
  color: #334155;
  line-height: 1.7;
  font-size: 14px;
}

.editor-panel-left .editor-box {
  border-color: #bfd0fb;
  background: #fdfefe;
  box-shadow: inset 0 0 0 1px rgba(103, 136, 235, 0.08);
}

.editor-panel-right .editor-box {
  border-color: #ffd3b2;
  background: #fffdfa;
  box-shadow: inset 0 0 0 1px rgba(227, 131, 48, 0.08);
}

.editor-box.wrap-off {
  white-space: pre;
  overflow-x: auto;
}

.workspace-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.workspace-actions button {
  border: 1px solid #cdd7e3;
  background: #f6f8fb;
  color: #415166;
  border-radius: 12px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
}

.workspace-actions button.primary {
  background: linear-gradient(135deg, #2b6fff 0%, #4d87ff 100%);
  border-color: #2b6fff;
  color: #fff;
}

.workspace-actions button.success {
  background: #edf9f3;
  border-color: #bde6ce;
  color: #127147;
}

.tool-tip {
  min-height: 24px;
  margin-top: 10px;
  color: #5f6e82;
  font-size: 14px;
}

.tool-tip.error {
  color: var(--tool-danger);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.preview-panel {
  border: 1px solid var(--tool-border);
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
}

.preview-panel-left {
  border-color: #bfd0fb;
  background: linear-gradient(180deg, #f4f8ff 0%, #ffffff 100%);
}

.preview-panel-right {
  border-color: #ffd3b2;
  background: linear-gradient(180deg, #fff5ed 0%, #ffffff 100%);
}

.preview-head {
  padding: 12px 14px;
  background: #f7faff;
  border-bottom: 1px solid var(--tool-border);
  color: #55657b;
  font-size: 14px;
}

.preview-panel-left .preview-head {
  background: #eaf2ff;
  border-bottom-color: #bfd0fb;
  color: #2554c7;
}

.preview-panel-right .preview-head {
  background: #ffefdf;
  border-bottom-color: #ffd3b2;
  color: #c8661c;
}

.preview-lines {
  max-height: 420px;
  overflow: auto;
}

.preview-line {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 10px;
  padding: 8px 12px;
  border-bottom: 1px solid #edf2f7;
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.preview-line .num {
  color: #90a0b7;
  text-align: right;
}

.preview-line.is-change {
  background: #fff7db;
}

.preview-line.is-delete {
  background: #ffe7e7;
}

.preview-line.is-insert {
  background: #e9f8ef;
}

.preview-panel-left .preview-line.is-change {
  background: #eaf2ff;
  box-shadow: inset 3px 0 0 #5b84ff;
}

.preview-panel-right .preview-line.is-change {
  background: #fff0e4;
  box-shadow: inset 3px 0 0 #ef8a42;
}

.preview-panel-left .preview-line.is-delete {
  background: #ffe5e5;
  box-shadow: inset 3px 0 0 #dd5f5f;
}

.preview-panel-right .preview-line.is-insert {
  background: #e8f7ee;
  box-shadow: inset 3px 0 0 #27a56a;
}

.preview-line.is-empty {
  color: #9aa9bc;
  font-style: italic;
}

.merge-list {
  display: grid;
  gap: 12px;
}

.merge-item {
  padding: 14px 16px;
  border: 1px solid var(--tool-border);
  border-radius: 16px;
  background: linear-gradient(180deg, #ffffff 0%, #f9fbff 100%);
}

.merge-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.merge-item-title {
  color: #223147;
  font-size: 14px;
}

.merge-item-meta {
  color: #7a8aa2;
  font-size: 13px;
}

.merge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.merge-actions button {
  border: 1px solid #cdd7e3;
  background: #f6f8fb;
  color: #415166;
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 13px;
  cursor: pointer;
}

.stats-grid {
  display: grid;
  gap: 10px;
}

.stat-card {
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--tool-border);
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.stat-card span {
  display: block;
  font-size: 13px;
  color: #74839a;
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: 24px;
  color: #13243a;
}

.feature-list {
  margin: 0;
  padding-left: 18px;
  color: #4d5f77;
  line-height: 1.8;
}

.panel-related h2 {
  margin: 0 0 10px;
  font-size: 18px;
  color: #223147;
}

@media (max-width: 1160px) {
  .diff-layout,
  .editor-grid,
  .preview-grid {
    grid-template-columns: 1fr;
  }
}