增加Tooltip组件。

src/components/Tooltip.module.css

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+@layer components {
+  .tooltip_container {
+    position: relative;
+    display: inline-block;
+  }
+  .tooltip {
+    position: absolute;
+    padding-inline: calc(var(--spacing) * 3);
+    padding-block: calc(var(--spacing) * 1);
+    border-radius: var(--border-radius-xxs);
+    color: light-dark(
+      oklch(from var(--color-neutral) calc(l + (1 - l) * 0.8) c h),
+      oklch(from var(--color-neutral) calc(l + (1 - l) * 0.7) c h)
+    );
+    background-color: light-dark(
+      oklch(from var(--color-qianbai) calc(l * 0.6) c h),
+      oklch(from var(--color-qihei) calc(l + (1 - l) * 0.2) c h)
+    );
+    font-size: var(--font-size-m);
+    width: fit-content;
+    max-width: 40em;
+    text-wrap: balance;
+    word-break: keep-all;
+    box-shadow: 0 4px 6px -1px oklch(from var(--color-black) l c h / 0.1),
+      0 2px 4px -2px oklch(from var(--color-black) l c h / 0.1);
+    pointer-events: none;
+    &.top {
+      bottom: 100%;
+      left: 50%;
+      transform: translateX(-50%);
+      margin-bottom: calc(var(--spacing) * 4);
+    }
+    &.bottom {
+      top: 100%;
+      left: 50%;
+      transform: translateX(-50%);
+      margin-top: calc(var(--spacing) * 4);
+    }
+    &.left {
+      top: 50%;
+      right: 100%;
+      transform: translateY(-50%);
+      margin-right: calc(var(--spacing) * 4);
+    }
+    &.right {
+      top: 50%;
+      left: 100%;
+      transform: translateY(-50%);
+      margin-left: calc(var(--spacing) * 4);
+    }
+  }
+  .fade_enter {
+    opacity: 0%;
+    transition: opacity 200ms ease-in;
+  }
+  .fade_enter_active {
+    opacity: 100%;
+  }
+  .fade_exit {
+    opacity: 100%;
+    transition: opacity 200ms ease-out;
+  }
+  .fade_exit_active {
+    opacity: 0%;
+  }
+}

src/components/Tooltip.tsx

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+import cx from 'clsx';
+import { ReactNode, useRef, useState } from 'react';
+import { CSSTransition } from 'react-transition-group';
+import styles from './Tooltip.module.css';
+
+interface TooltipProps {
+  content: ReactNode;
+  position?: 'top' | 'bottom' | 'left' | 'right';
+  children?: ReactNode;
+}
+
+const positionMap = {
+  top: styles.top,
+  bottom: styles.bottom,
+  left: styles.left,
+  right: styles.right,
+};
+
+export function Tooltip({ content, position = 'top', children }: TooltipProps) {
+  const [show, setShow] = useState(false);
+  const contentRef = useRef<HTMLDivElement>();
+
+  return (
+    <div
+      className={styles.tooltip_container}
+      onMouseEnter={() => setShow(true)}
+      onMouseLeave={() => setShow(false)}>
+      {children}
+      <CSSTransition
+        nodeRef={contentRef}
+        in={show}
+        unmountOnExit
+        classNames={{
+          enter: styles.fade_enter,
+          enterActive: styles.fade_enter_active,
+          exit: styles.fade_exit,
+          exitActive: styles.fade_exit_active,
+        }}
+        timeout={200}>
+        <div className={cx(styles.tooltip, positionMap[position])} ref={contentRef}>
+          {content}
+        </div>
+      </CSSTransition>
+    </div>
+  );
+}