/* 工具页共享布局：简洁顶栏 + 满高编辑区 + 自然页脚 */
:root {
  --header-height: 56px;
  --page-bg: #F7F8FA;
  --border-color: #E5E6EB;
  --brand: #1677FF;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body.tool-page {
  margin: 0;
  min-height: 100vh;
  background-color: var(--page-bg);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  color: #1D2129;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-y: auto;
}

.border-custom {
  border-color: var(--border-color);
}

/* —— 顶栏 —— */
.tool-page-header {
  height: var(--header-height);
  flex-shrink: 0;
  background: #fff;
  border-bottom: 1px solid var(--border-color);
}

.tool-page-header__inner {
  max-width: 100%;
  height: 100%;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.tool-page-header__brand-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  min-width: 0;
}

.tool-page-logo {
  color: var(--brand);
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.tool-page-logo:hover {
  color: #4096FF;
}

.tool-page-nav {
  display: none;
  align-items: center;
  gap: 4px;
}

.tool-page-nav .nav-link {
  color: #4E5969;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  padding: 8px 12px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}

.tool-page-nav .nav-link:hover {
  color: var(--brand);
}

.tool-page-nav .nav-link.active {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

.tool-page-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  padding: 8px;
  border: none;
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
}

.tool-page-menu-toggle:hover {
  background: #F2F3F5;
}

.tool-page-menu-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: #4E5969;
}

.tool-page-mobile-menu {
  display: none;
  background: #fff;
  border-top: 1px solid var(--border-color);
  padding: 8px 16px 12px;
}

.tool-page-mobile-menu.is-open {
  display: block;
}

.tool-page-mobile-menu a {
  display: block;
  padding: 8px 0;
  font-size: 14px;
  font-weight: 500;
  color: #4E5969;
  text-decoration: none;
}

.tool-page-mobile-menu a.active {
  color: var(--brand);
}

@media (min-width: 768px) {
  .tool-page-nav {
    display: flex;
  }

  .tool-page-menu-toggle {
    display: none;
  }
}

/* —— 编辑工作区：恰好占满 100vh - 顶栏 —— */
.editor-workspace {
  height: calc(100vh - var(--header-height));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--page-bg);
}

.editor-workspace__toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--page-bg);
}

.editor-workspace__toolbar .tool-btn {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background: #fff;
  color: #4E5969;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.editor-workspace__toolbar .tool-btn:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.editor-workspace__toolbar .toolbar-meta {
  margin-left: auto;
  font-size: 12px;
  color: #86909C;
}

.main-content {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.split-pane {
  flex: 1;
  min-height: 0;
  display: flex;
  overflow: hidden;
  padding: 8px;
  background: var(--page-bg);
}

.editor-panel,
.preview-panel,
.input-panel,
.tree-panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.panel-header,
.panel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  background: #FAFAFA;
  flex-shrink: 0;
}

.panel-toolbar {
  gap: 8px;
  padding: 6px 12px;
}

.panel-toolbar .tool-btn {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background: #fff;
  color: #4E5969;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.panel-toolbar .tool-btn:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.panel-toolbar .tool-btn.is-active {
  border-color: var(--brand);
  color: var(--brand);
  background: #F0F5FF;
}

.panel-title {
  font-size: 13px;
  font-weight: 500;
  color: #4E5969;
}

.panel-hint {
  font-size: 12px;
  color: #C9CDD4;
}

.editor-panel textarea,
.input-panel textarea {
  flex: 1;
  min-height: 0;
  width: 100%;
  border: none;
  padding: 16px;
  font-family: 'SF Mono', 'Menlo', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
  resize: none;
  outline: none;
  background: #FAFBFC;
  color: #1D2129;
  overflow: auto;
}

.preview-content {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 20px 24px;
  background: #FAFBFC;
  font-size: 15px;
  line-height: 1.8;
  color: #1D2129;
  word-wrap: break-word;
}

.tree-container {
  flex: 1;
  min-height: 0;
  overflow: auto;
}

/* —— 页脚（非 fixed，位于工作区下方） —— */
.tool-page-footer {
  background: #fff;
  border-top: 1px solid var(--border-color);
}

.tool-page-footer__inner {
  max-width: 100%;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: #86909C;
}

.tool-page-footer__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 16px;
}

.tool-page-footer__links a {
  color: #4E5969;
  text-decoration: none;
  transition: color 0.2s ease;
}

.tool-page-footer__links a:hover {
  color: var(--brand);
}

.tool-page-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.tool-page-footer__legal a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.tool-page-footer__legal a:hover {
  color: var(--brand);
}

.tool-page-footer__sep {
  color: #E5E6EB;
}

@media (min-width: 768px) {
  .tool-page-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
  }

  .tool-page-footer__links {
    justify-content: flex-start;
  }

  .tool-page-footer__legal {
    justify-content: flex-end;
  }
}

/* 移动端：上下分栏仍占满工作区 */
@media (max-width: 768px) {
  .split-pane {
    flex-direction: column;
  }

  .split-pane > .editor-panel,
  .split-pane > .preview-panel,
  .split-pane > .input-panel,
  .split-pane > .tree-panel {
    flex: 1 !important;
    width: 100% !important;
    min-height: 0;
  }
}