/* 可拖拽分栏 + 面板最大化 */
.split-pane {
  gap: 0;
  position: relative;
}

.split-pane > .input-panel,
.split-pane > .editor-panel,
.split-pane > .tree-panel,
.split-pane > .preview-panel {
  flex: none;
  min-width: 0;
}

.split-pane > .tree-panel,
.split-pane > .preview-panel {
  flex: 1;
  width: auto;
}

/* 中间整块为隐形拖拽区，无竖条装饰 */
.split-resize-zone {
  flex-shrink: 0;
  width: 16px;
  align-self: stretch;
  cursor: col-resize;
  background: transparent;
  position: relative;
  z-index: 2;
  touch-action: none;
}

.split-resize-zone:hover {
  background: rgba(22, 119, 255, 0.05);
}

.split-resize-zone.is-active {
  background: rgba(22, 119, 255, 0.08);
}

.split-pane.maximized-left > .split-resize-zone,
.split-pane.maximized-right > .split-resize-zone {
  display: none;
}

.split-pane.maximized-left > .input-panel,
.split-pane.maximized-left > .editor-panel {
  flex: 1 !important;
  width: auto !important;
  max-width: none !important;
}

.split-pane.maximized-left > .tree-panel,
.split-pane.maximized-left > .preview-panel {
  display: none;
}

.split-pane.maximized-right > .tree-panel,
.split-pane.maximized-right > .preview-panel {
  flex: 1 !important;
  width: auto !important;
  max-width: none !important;
}

.split-pane.maximized-right > .input-panel,
.split-pane.maximized-right > .editor-panel {
  display: none;
}

/* 全屏最大化：覆盖顶栏，占满整个视口 */
body.is-panel-maximized {
  overflow: hidden;
}

body.is-panel-maximized .split-pane.maximized-left > .input-panel,
body.is-panel-maximized .split-pane.maximized-left > .editor-panel,
body.is-panel-maximized .split-pane.maximized-right > .tree-panel,
body.is-panel-maximized .split-pane.maximized-right > .preview-panel {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100% !important;
  height: 100vh !important;
  max-width: none !important;
  flex: none !important;
  z-index: 1100;
  border-radius: 0;
  margin: 0;
  display: flex !important;
}

.panel-header-actions,
.panel-toolbar-maximize {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

.panel-maximize-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid #C9CDD4;
  border-radius: 4px;
  background: #FFFFFF;
  color: #4E5969;
  cursor: pointer;
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.panel-maximize-btn:hover {
  border-color: #1677FF;
  color: #1677FF;
  background: #F0F5FF;
  box-shadow: 0 2px 6px rgba(22, 119, 255, 0.18);
}

.panel-maximize-btn.is-restored {
  border-color: #1677FF;
  color: #1677FF;
  background: #E6F4FF;
}

.panel-maximize-btn svg {
  display: block;
  pointer-events: none;
}

.panel-maximize-btn .icon-restore {
  display: none;
}

.panel-maximize-btn.is-restored .icon-maximize {
  display: none;
}

.panel-maximize-btn.is-restored .icon-restore {
  display: block;
}

body.is-split-resizing {
  cursor: col-resize !important;
  user-select: none !important;
}

body.is-split-resizing * {
  cursor: col-resize !important;
}

@media (max-width: 768px) {
  .split-resize-zone {
    display: none;
  }

  .split-pane > .input-panel,
  .split-pane > .editor-panel,
  .split-pane > .tree-panel,
  .split-pane > .preview-panel {
    width: 100% !important;
    flex: none !important;
  }

  .split-pane.maximized-left > .input-panel,
  .split-pane.maximized-left > .editor-panel {
    flex: 1 !important;
    height: auto !important;
  }

  .split-pane.maximized-right > .tree-panel,
  .split-pane.maximized-right > .preview-panel {
    flex: 1 !important;
    height: auto !important;
  }
}