feat: implement markdown components for enhanced rendering

web/src/components/MemoContent/CodeBlock.tsx

@@ -6,14 +6,15 @@ import { useAuth } from "@/contexts/AuthContext";
 import { cn } from "@/lib/utils";
 import { getThemeWithFallback, resolveTheme } from "@/utils/theme";
 import { MermaidBlock } from "./MermaidBlock";
+import type { ReactMarkdownProps } from "./markdown/types";
 import { extractCodeContent, extractLanguage } from "./utils";
 
-interface CodeBlockProps {
+interface CodeBlockProps extends ReactMarkdownProps {
   children?: React.ReactNode;
   className?: string;
 }
 
-export const CodeBlock = ({ children, className, ...props }: CodeBlockProps) => {
+export const CodeBlock = ({ children, className, node: _node, ...props }: CodeBlockProps) => {
   const { userGeneralSetting } = useAuth();
   const [copied, setCopied] = useState(false);
 
@@ -114,20 +115,41 @@ export const CodeBlock = ({ children, className, ...props }: CodeBlockProps) =>
   };
 
   return (
-    <pre className="relative">
-      <div className="absolute right-2 leading-3 top-1.5 flex flex-row justify-end items-center gap-1 opacity-60 hover:opacity-80">
-        <span className="text-[10px] font-medium text-muted-foreground/60 uppercase tracking-wider select-none">{language}</span>
+    <pre className="relative my-3 rounded-lg border border-border bg-muted/30 overflow-hidden">
+      {/* Header with language label and copy button */}
+      <div className="flex items-center justify-between px-3 py-1.5 border-b border-border bg-accent/30">
+        <span className="text-xs font-medium text-muted-foreground uppercase tracking-wide select-none">{language || "text"}</span>
         <button
           onClick={handleCopy}
-          className={cn("rounded-md transition-all", "hover:bg-accent/50", copied ? "text-primary" : "text-muted-foreground")}
+          className={cn(
+            "inline-flex items-center gap-1.5 px-2 py-0.5 rounded-md text-xs font-medium",
+            "transition-all duration-200",
+            "hover:bg-accent/80 active:scale-95",
+            copied ? "text-primary bg-primary/10" : "text-muted-foreground bg-transparent",
+          )}
           aria-label={copied ? "Copied" : "Copy code"}
           title={copied ? "Copied!" : "Copy code"}
         >
-          {copied ? <CheckIcon className="w-3 h-3" /> : <CopyIcon className="w-3 h-3" />}
+          {copied ? (
+            <>
+              <CheckIcon className="w-3.5 h-3.5" />
+              <span>Copied</span>
+            </>
+          ) : (
+            <>
+              <CopyIcon className="w-3.5 h-3.5" />
+              <span>Copy</span>
+            </>
+          )}
         </button>
       </div>
-      <div className={className} {...props}>
-        <code className={`language-${language}`} dangerouslySetInnerHTML={{ __html: highlightedCode }} />
+
+      {/* Code content */}
+      <div className="overflow-x-auto">
+        <code
+          className={cn("block px-3 py-2 text-sm leading-relaxed", `language-${language}`)}
+          dangerouslySetInnerHTML={{ __html: highlightedCode }}
+        />
       </div>
     </pre>
   );

web/src/components/MemoContent/Table.tsx

@@ -0,0 +1,83 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./markdown/types";
+
+interface TableProps extends React.HTMLAttributes<HTMLTableElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+export const Table = ({ children, className, node: _node, ...props }: TableProps) => {
+  return (
+    <div className="w-full overflow-x-auto rounded-lg border border-border my-4">
+      <table className={cn("w-full border-collapse text-sm", className)} {...props}>
+        {children}
+      </table>
+    </div>
+  );
+};
+
+interface TableHeadProps extends React.HTMLAttributes<HTMLTableSectionElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+export const TableHead = ({ children, className, node: _node, ...props }: TableHeadProps) => {
+  return (
+    <thead className={cn("bg-accent", className)} {...props}>
+      {children}
+    </thead>
+  );
+};
+
+interface TableBodyProps extends React.HTMLAttributes<HTMLTableSectionElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+export const TableBody = ({ children, className, node: _node, ...props }: TableBodyProps) => {
+  return (
+    <tbody className={cn("divide-y divide-border", className)} {...props}>
+      {children}
+    </tbody>
+  );
+};
+
+interface TableRowProps extends React.HTMLAttributes<HTMLTableRowElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+export const TableRow = ({ children, className, node: _node, ...props }: TableRowProps) => {
+  return (
+    <tr className={cn("transition-colors hover:bg-muted/50", "even:bg-accent/50", className)} {...props}>
+      {children}
+    </tr>
+  );
+};
+
+interface TableHeaderCellProps extends React.ThHTMLAttributes<HTMLTableCellElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+export const TableHeaderCell = ({ children, className, node: _node, ...props }: TableHeaderCellProps) => {
+  return (
+    <th
+      className={cn(
+        "px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-muted-foreground",
+        "border-b-2 border-border",
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </th>
+  );
+};
+
+interface TableCellProps extends React.TdHTMLAttributes<HTMLTableCellElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+export const TableCell = ({ children, className, node: _node, ...props }: TableCellProps) => {
+  return (
+    <td className={cn("px-4 py-3 text-left", className)} {...props}>
+      {children}
+    </td>
+  );
+};

web/src/components/MemoContent/TaskListItem.tsx

@@ -1,16 +1,15 @@
-import type { Element } from "hast";
 import { useRef } from "react";
 import { Checkbox } from "@/components/ui/checkbox";
 import { useUpdateMemo } from "@/hooks/useMemoQueries";
 import { toggleTaskAtIndex } from "@/utils/markdown-manipulation";
 import { useMemoViewContext, useMemoViewDerived } from "../MemoView/MemoViewContext";
+import type { ReactMarkdownProps } from "./markdown/types";
 
-interface TaskListItemProps extends React.InputHTMLAttributes<HTMLInputElement> {
-  node?: Element; // AST node from react-markdown
+interface TaskListItemProps extends React.InputHTMLAttributes<HTMLInputElement>, ReactMarkdownProps {
   checked?: boolean;
 }
 
-export const TaskListItem: React.FC<TaskListItemProps> = ({ checked, ...props }) => {
+export const TaskListItem: React.FC<TaskListItemProps> = ({ checked, node: _node, ...props }) => {
   const { memo } = useMemoViewContext();
   const { readonly } = useMemoViewDerived();
   const checkboxRef = useRef<HTMLButtonElement>(null);
@@ -35,14 +34,19 @@ export const TaskListItem: React.FC<TaskListItemProps> = ({ checked, ...props })
     if (taskIndexStr !== null) {
       taskIndex = parseInt(taskIndexStr);
     } else {
-      // Fallback: Calculate index by counting ALL task list items in the memo
-      // Find the markdown-content container by traversing up from the list item
-      const container = listItem.closest(".markdown-content");
-      if (!container) {
-        return;
+      // Fallback: Calculate index by counting task list items
+      // Walk up to find the parent element with all task items
+      let searchRoot = listItem.parentElement;
+      while (searchRoot && !searchRoot.classList.contains("contains-task-list")) {
+        searchRoot = searchRoot.parentElement;
       }
 
-      const allTaskItems = container.querySelectorAll("li.task-list-item");
+      // If not found, search from the document root
+      if (!searchRoot) {
+        searchRoot = document.body;
+      }
+
+      const allTaskItems = searchRoot.querySelectorAll("li.task-list-item");
       for (let i = 0; i < allTaskItems.length; i++) {
         if (allTaskItems[i] === listItem) {
           taskIndex = i;

web/src/components/MemoContent/index.tsx

@@ -17,6 +17,8 @@ import { CodeBlock } from "./CodeBlock";
 import { isTagNode, isTaskListItemNode } from "./ConditionalComponent";
 import { COMPACT_MODE_CONFIG, SANITIZE_SCHEMA } from "./constants";
 import { useCompactLabel, useCompactMode } from "./hooks";
+import { Blockquote, Heading, HorizontalRule, Image, InlineCode, Link, List, ListItem, Paragraph } from "./markdown";
+import { Table, TableBody, TableCell, TableHead, TableHeaderCell, TableRow } from "./Table";
 import { Tag } from "./Tag";
 import { TaskListItem } from "./TaskListItem";
 import type { MemoContentProps } from "./types";
@@ -37,7 +39,7 @@ const MemoContent = (props: MemoContentProps) => {
       <div
         ref={memoContentContainerRef}
         className={cn(
-          "markdown-content relative w-full max-w-full wrap-break-word text-base leading-6",
+          "relative w-full max-w-full wrap-break-word text-base leading-6",
           showCompactMode === "ALL" && `max-h-[${COMPACT_MODE_CONFIG.maxHeightVh}vh] overflow-hidden`,
           contentClassName,
         )}
@@ -62,12 +64,38 @@ const MemoContent = (props: MemoContentProps) => {
               }
               return <span {...rest} />;
             }) as React.ComponentType<React.ComponentProps<"span">>,
-            pre: CodeBlock,
-            a: ({ href, children, ...aProps }) => (
-              <a href={href} target="_blank" rel="noopener noreferrer" {...aProps}>
+            // Headings
+            h1: ({ children }) => <Heading level={1}>{children}</Heading>,
+            h2: ({ children }) => <Heading level={2}>{children}</Heading>,
+            h3: ({ children }) => <Heading level={3}>{children}</Heading>,
+            h4: ({ children }) => <Heading level={4}>{children}</Heading>,
+            h5: ({ children }) => <Heading level={5}>{children}</Heading>,
+            h6: ({ children }) => <Heading level={6}>{children}</Heading>,
+            // Block elements
+            p: ({ children }) => <Paragraph>{children}</Paragraph>,
+            blockquote: ({ children }) => <Blockquote>{children}</Blockquote>,
+            hr: () => <HorizontalRule />,
+            // Lists
+            ul: ({ children, ...props }) => <List {...props}>{children}</List>,
+            ol: ({ children, ...props }) => (
+              <List ordered {...props}>
                 {children}
-              </a>
+              </List>
             ),
+            li: ({ children, ...props }) => <ListItem {...props}>{children}</ListItem>,
+            // Inline elements
+            a: ({ children, ...props }) => <Link {...props}>{children}</Link>,
+            code: ({ children }) => <InlineCode>{children}</InlineCode>,
+            img: ({ ...props }) => <Image {...props} />,
+            // Code blocks
+            pre: CodeBlock,
+            // Tables
+            table: ({ children }) => <Table>{children}</Table>,
+            thead: ({ children }) => <TableHead>{children}</TableHead>,
+            tbody: ({ children }) => <TableBody>{children}</TableBody>,
+            tr: ({ children }) => <TableRow>{children}</TableRow>,
+            th: ({ children, ...props }) => <TableHeaderCell {...props}>{children}</TableHeaderCell>,
+            td: ({ children, ...props }) => <TableCell {...props}>{children}</TableCell>,
           }}
         >
           {content}

web/src/components/MemoContent/markdown/Blockquote.tsx

@@ -0,0 +1,17 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface BlockquoteProps extends React.BlockquoteHTMLAttributes<HTMLQuoteElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+/**
+ * Blockquote component with left border accent
+ */
+export const Blockquote = ({ children, className, node: _node, ...props }: BlockquoteProps) => {
+  return (
+    <blockquote className={cn("my-0 mb-2 border-l-4 border-border pl-3 text-muted-foreground", className)} {...props}>
+      {children}
+    </blockquote>
+  );
+};

web/src/components/MemoContent/markdown/Heading.tsx

@@ -0,0 +1,30 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface HeadingProps extends React.HTMLAttributes<HTMLHeadingElement>, ReactMarkdownProps {
+  level: 1 | 2 | 3 | 4 | 5 | 6;
+  children: React.ReactNode;
+}
+
+/**
+ * Heading component for h1-h6 elements
+ * Renders semantic heading levels with consistent styling
+ */
+export const Heading = ({ level, children, className, node: _node, ...props }: HeadingProps) => {
+  const Component = `h${level}` as const;
+
+  const levelClasses = {
+    1: "text-3xl font-bold border-b border-border pb-1",
+    2: "text-2xl border-b border-border pb-1",
+    3: "text-xl",
+    4: "text-base",
+    5: "text-sm",
+    6: "text-sm text-muted-foreground",
+  };
+
+  return (
+    <Component className={cn("mt-3 mb-2 font-semibold leading-tight", levelClasses[level], className)} {...props}>
+      {children}
+    </Component>
+  );
+};

web/src/components/MemoContent/markdown/HorizontalRule.tsx

@@ -0,0 +1,11 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface HorizontalRuleProps extends React.HTMLAttributes<HTMLHRElement>, ReactMarkdownProps {}
+
+/**
+ * Horizontal rule separator
+ */
+export const HorizontalRule = ({ className, node: _node, ...props }: HorizontalRuleProps) => {
+  return <hr className={cn("my-2 h-0 border-0 border-b border-border", className)} {...props} />;
+};

web/src/components/MemoContent/markdown/Image.tsx

@@ -0,0 +1,12 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface ImageProps extends React.ImgHTMLAttributes<HTMLImageElement>, ReactMarkdownProps {}
+
+/**
+ * Image component for markdown images
+ * Responsive with rounded corners
+ */
+export const Image = ({ className, alt, node: _node, ...props }: ImageProps) => {
+  return <img className={cn("max-w-full h-auto rounded-lg my-2", className)} alt={alt} {...props} />;
+};

web/src/components/MemoContent/markdown/InlineCode.tsx

@@ -0,0 +1,17 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface InlineCodeProps extends React.HTMLAttributes<HTMLElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+/**
+ * Inline code component with background and monospace font
+ */
+export const InlineCode = ({ children, className, node: _node, ...props }: InlineCodeProps) => {
+  return (
+    <code className={cn("font-mono text-sm bg-muted px-1 py-0.5 rounded", className)} {...props}>
+      {children}
+    </code>
+  );
+};

web/src/components/MemoContent/markdown/Link.tsx

@@ -0,0 +1,24 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface LinkProps extends React.AnchorHTMLAttributes<HTMLAnchorElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+/**
+ * Link component for external links
+ * Opens in new tab with security attributes
+ */
+export const Link = ({ children, className, href, node: _node, ...props }: LinkProps) => {
+  return (
+    <a
+      href={href}
+      target="_blank"
+      rel="noopener noreferrer"
+      className={cn("text-primary underline transition-opacity hover:opacity-80", className)}
+      {...props}
+    >
+      {children}
+    </a>
+  );
+};

web/src/components/MemoContent/markdown/List.tsx

@@ -0,0 +1,66 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface ListProps extends React.HTMLAttributes<HTMLUListElement | HTMLOListElement>, ReactMarkdownProps {
+  ordered?: boolean;
+  children: React.ReactNode;
+}
+
+/**
+ * List component for both regular and task lists (GFM)
+ * Detects task lists via the "contains-task-list" class added by remark-gfm
+ */
+export const List = ({ ordered, children, className, node: _node, ...domProps }: ListProps) => {
+  const Component = ordered ? "ol" : "ul";
+  const isTaskList = className?.includes("contains-task-list");
+
+  return (
+    <Component
+      className={cn(
+        "my-0 mb-2 list-outside",
+        isTaskList ? "pl-0 list-none" : cn("pl-6", ordered ? "list-decimal" : "list-disc"),
+        className,
+      )}
+      {...domProps}
+    >
+      {children}
+    </Component>
+  );
+};
+
+interface ListItemProps extends React.LiHTMLAttributes<HTMLLIElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+/**
+ * List item component for both regular and task list items
+ * Detects task items via the "task-list-item" class added by remark-gfm
+ * Applies specialized styling for task checkboxes
+ */
+export const ListItem = ({ children, className, node: _node, ...domProps }: ListItemProps) => {
+  const isTaskListItem = className?.includes("task-list-item");
+
+  if (isTaskListItem) {
+    return (
+      <li
+        className={cn(
+          "mt-0.5 leading-6 list-none",
+          // Task item styles: checkbox margins, inline paragraph, nested list indent
+          "[&>button]:mr-2 [&>button]:align-middle",
+          "[&>p]:inline [&>p]:m-0",
+          "[&>.contains-task-list]:pl-6",
+          className,
+        )}
+        {...domProps}
+      >
+        {children}
+      </li>
+    );
+  }
+
+  return (
+    <li className={cn("mt-0.5 leading-6", className)} {...domProps}>
+      {children}
+    </li>
+  );
+};

web/src/components/MemoContent/markdown/Paragraph.tsx

@@ -0,0 +1,17 @@
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface ParagraphProps extends React.HTMLAttributes<HTMLParagraphElement>, ReactMarkdownProps {
+  children: React.ReactNode;
+}
+
+/**
+ * Paragraph component with compact spacing
+ */
+export const Paragraph = ({ children, className, node: _node, ...props }: ParagraphProps) => {
+  return (
+    <p className={cn("my-0 mb-2 leading-6", className)} {...props}>
+      {children}
+    </p>
+  );
+};

web/src/components/MemoContent/markdown/README.md

@@ -0,0 +1,97 @@
+# Markdown Components
+
+Modern, type-safe React components for rendering markdown content via react-markdown.
+
+## Architecture
+
+### Component-Based Rendering
+Following patterns from popular AI chat apps (ChatGPT, Claude, Perplexity), we use React components instead of CSS selectors for markdown rendering. This provides:
+
+- **Type Safety**: Full TypeScript support with proper prop types
+- **Maintainability**: Components are easier to test, modify, and understand
+- **Performance**: No CSS specificity conflicts, cleaner DOM
+- **Modularity**: Each element is independently styled and documented
+
+### Type System
+
+All components extend `ReactMarkdownProps` which includes the AST `node` prop passed by react-markdown. This is explicitly destructured as `node: _node` to:
+1. Filter it from DOM props (avoids `node="[object Object]"` in HTML)
+2. Keep it available for advanced use cases (e.g., detecting task lists)
+3. Maintain type safety without `as any` casts
+
+### GFM Task Lists
+
+Task lists (from remark-gfm) are handled by:
+- **Detection**: `contains-task-list` and `task-list-item` classes from remark-gfm
+- **Styling**: Tailwind utilities with arbitrary variants for nested elements
+- **Checkboxes**: Custom `TaskListItem` component with Radix UI checkbox
+- **Interactivity**: Updates memo content via `toggleTaskAtIndex` utility
+
+### Component Patterns
+
+Each component follows this structure:
+```tsx
+import { cn } from "@/lib/utils";
+import type { ReactMarkdownProps } from "./types";
+
+interface ComponentProps extends React.HTMLAttributes<HTMLElement>, ReactMarkdownProps {
+  children?: React.ReactNode;
+  // component-specific props
+}
+
+/**
+ * JSDoc description
+ */
+export const Component = ({ children, className, node: _node, ...props }: ComponentProps) => {
+  return (
+    <element className={cn("base-classes", className)} {...props}>
+      {children}
+    </element>
+  );
+};
+```
+
+## Components
+
+| Component | Element | Purpose |
+|-----------|---------|---------|
+| `Heading` | h1-h6 | Semantic headings with level-based styling |
+| `Paragraph` | p | Compact paragraphs with consistent spacing |
+| `Link` | a | External links with security attributes |
+| `List` | ul/ol | Regular and GFM task lists |
+| `ListItem` | li | List items with task checkbox support |
+| `Blockquote` | blockquote | Quotes with left border accent |
+| `InlineCode` | code | Inline code with background |
+| `Image` | img | Responsive images with rounded corners |
+| `HorizontalRule` | hr | Section separators |
+
+## Styling Approach
+
+- **Tailwind CSS**: All styling uses Tailwind utilities
+- **Design Tokens**: Colors use CSS variables (e.g., `--primary`, `--muted-foreground`)
+- **Responsive**: Max-width constraints, responsive images
+- **Accessibility**: Semantic HTML, proper ARIA attributes via Radix UI
+
+## Integration
+
+Components are mapped to HTML elements in `MemoContent/index.tsx`:
+
+```tsx
+<ReactMarkdown
+  components={{
+    h1: ({ children }) => <Heading level={1}>{children}</Heading>,
+    p: ({ children, ...props }) => <Paragraph {...props}>{children}</Paragraph>,
+    // ... more mappings
+  }}
+>
+  {content}
+</ReactMarkdown>
+```
+
+## Future Enhancements
+
+- [ ] Syntax highlighting themes for code blocks
+- [ ] Table sorting/filtering interactions
+- [ ] Image lightbox/zoom functionality
+- [ ] Collapsible sections for long content
+- [ ] Copy button for code blocks

web/src/components/MemoContent/markdown/index.ts

@@ -0,0 +1,8 @@
+export { Blockquote } from "./Blockquote";
+export { Heading } from "./Heading";
+export { HorizontalRule } from "./HorizontalRule";
+export { Image } from "./Image";
+export { InlineCode } from "./InlineCode";
+export { Link } from "./Link";
+export { List, ListItem } from "./List";
+export { Paragraph } from "./Paragraph";

web/src/components/MemoContent/markdown/types.ts

@@ -0,0 +1,9 @@
+import type { Element } from "hast";
+
+/**
+ * Props passed by react-markdown to custom components
+ * Includes the AST node for advanced use cases
+ */
+export interface ReactMarkdownProps {
+  node?: Element;
+}

web/src/index.css

@@ -15,343 +15,16 @@
   }
 
   /* ========================================
-   * Task List Styles
-   * Based on GitHub's implementation for proper nesting
+   * Embedded Content
    * ======================================== */
 
-  /* Task list items - remove default list styling */
-  .markdown-content .task-list-item,
-  .prose .task-list-item {
-    list-style-type: none;
-  }
-
-  /* Task list checkboxes - use negative margin for proper alignment */
-  .markdown-content .task-list-item > input[type="checkbox"],
-  .prose .task-list-item > input[type="checkbox"] {
-    margin: 0 0.2em 0.25em -1.4em;
-    vertical-align: middle;
-  }
-
-  /* Paragraphs inside task items should not have extra margins */
-  .markdown-content .task-list-item > p,
-  .prose .task-list-item > p {
-    display: inline;
-    margin: 0;
-  }
-
-  /* Task list containers maintain standard list spacing */
-  .markdown-content .contains-task-list,
-  .prose .contains-task-list {
-    list-style: none;
-    padding-left: 0;
-  }
-
-  /* Nested task lists get proper indentation (standard list padding) */
-  .markdown-content .task-list-item .contains-task-list,
-  .prose .task-list-item .contains-task-list {
-    padding-left: 1.5em;
-  }
-
-  /* ========================================
-   * Markdown Content Styles
-   * Compact spacing optimized for memos/notes
-   *
-   * Key principles:
-   * 1. Block elements use 8px (0.5rem) bottom margin (compact)
-   * 2. First child has no top margin, last child has no bottom margin
-   * 3. Nested elements have minimal spacing
-   * 4. Inline elements have no vertical spacing
-   * ======================================== */
-
-  .markdown-content {
-    font-size: 1rem;
-    line-height: 1.5;
-    color: var(--foreground);
-    word-wrap: break-word;
-  }
-
-  /* ========================================
-   * First/Last Child Normalization
-   * Remove boundary spacing to prevent double margins
-   * ======================================== */
-
-  .markdown-content > :first-child {
-    margin-top: 0 !important;
-  }
-
-  .markdown-content > :last-child {
-    margin-bottom: 0 !important;
-  }
-
-  /* ========================================
-   * Block Elements
-   * Compact 8px bottom margin
-   * ======================================== */
-
-  .markdown-content p,
-  .markdown-content blockquote,
-  .markdown-content ul,
-  .markdown-content ol,
-  .markdown-content dl,
-  .markdown-content table,
-  .markdown-content pre,
-  .markdown-content hr {
-    margin-top: 0;
-    margin-bottom: 0.5rem;
-  }
-
-  /* ========================================
-   * Headings
-   * Compact spacing for visual separation
-   * ======================================== */
-
-  .markdown-content h1,
-  .markdown-content h2,
-  .markdown-content h3,
-  .markdown-content h4,
-  .markdown-content h5,
-  .markdown-content h6 {
-    margin-top: 0.75rem;
-    margin-bottom: 0.5rem;
-    font-weight: 600;
-    line-height: 1.25;
-  }
-
-  .markdown-content h1 {
-    font-size: 2em;
-    font-weight: 700;
-    border-bottom: 1px solid var(--border);
-    padding-bottom: 0.25rem;
-  }
-
-  .markdown-content h2 {
-    font-size: 1.5em;
-    border-bottom: 1px solid var(--border);
-    padding-bottom: 0.25rem;
-  }
-
-  .markdown-content h3 {
-    font-size: 1.25em;
-  }
-
-  .markdown-content h4 {
-    font-size: 1em;
-  }
-
-  .markdown-content h5 {
-    font-size: 0.875em;
-  }
-
-  .markdown-content h6 {
-    font-size: 0.85em;
-    color: var(--muted-foreground);
-  }
-
-  /* ========================================
-   * Paragraphs
-   * ======================================== */
-
-  .markdown-content p {
-    line-height: 1.5;
-  }
-
-  /* ========================================
-   * Links
-   * ======================================== */
-
-  .markdown-content a {
-    color: var(--primary);
-    text-decoration: underline;
-    transition: opacity 150ms;
-  }
-
-  .markdown-content a:hover {
-    opacity: 0.8;
-  }
-
-  /* ========================================
-   * Lists
-   * ======================================== */
-
-  .markdown-content ul,
-  .markdown-content ol {
-    padding-left: 1.5em;
-    list-style-position: outside;
-  }
-
-  .markdown-content ul {
-    list-style-type: disc;
-  }
-
-  .markdown-content ol {
-    list-style-type: decimal;
-  }
-
-  .markdown-content li {
-    margin-top: 0.125rem;
-    line-height: 1.5;
-  }
-
-  .markdown-content li > p {
-    margin-bottom: 0.125rem;
-  }
-
-  /* Nested lists should have minimal spacing */
-  .markdown-content li > ul,
-  .markdown-content li > ol {
-    margin-top: 0.125rem;
-    margin-bottom: 0.125rem;
-  }
-
-  /* First and last items in lists */
-  .markdown-content li:first-child {
-    margin-top: 0;
-  }
-
-  .markdown-content li + li {
-    margin-top: 0.125rem;
-  }
-
-  /* ========================================
-   * Code (inline and blocks)
-   * ======================================== */
-
-  .markdown-content code {
-    font-family: var(--font-mono);
-    font-size: 0.875em;
-    background: var(--muted);
-    padding: 0.125rem 0.25rem;
-    border-radius: 0.25rem;
-  }
-
-  .markdown-content pre {
-    font-family: var(--font-mono);
-    font-size: 0.875rem;
-    background: var(--muted);
-    padding: 0.5rem 0.75rem;
-    border-radius: 0.375rem;
-    overflow-x: auto;
-    white-space: pre-wrap;
-    word-wrap: break-word;
-  }
-
-  .markdown-content pre code {
-    background: none;
-    padding: 0;
-    font-size: inherit;
-    border-radius: 0;
-  }
-
-  /* ========================================
-   * Blockquotes
-   * ======================================== */
-
-  .markdown-content blockquote {
-    padding: 0 0.75rem;
-    color: var(--muted-foreground);
-    border-left: 0.25rem solid var(--border);
-  }
-
-  .markdown-content blockquote > :first-child {
-    margin-top: 0;
-  }
-
-  .markdown-content blockquote > :last-child {
-    margin-bottom: 0;
-  }
-
-  /* ========================================
-   * Horizontal Rules
-   * ======================================== */
-
-  .markdown-content hr {
-    height: 0.25em;
-    padding: 0;
-    background: transparent;
-    border: 0;
-    border-bottom: 1px solid var(--border);
-  }
-
-  /* ========================================
-   * Tables
-   * ======================================== */
-
-  .markdown-content table {
-    display: block;
-    width: 100%;
-    width: max-content;
-    max-width: 100%;
-    overflow: auto;
-    border-spacing: 0;
-    border-collapse: collapse;
-  }
-
-  .markdown-content table th,
-  .markdown-content table td {
-    padding: 0.25rem 0.5rem;
-    border: 1px solid var(--border);
-  }
-
-  .markdown-content table th {
-    font-weight: 600;
-    background: var(--muted);
-  }
-
-  .markdown-content table tr {
-    background: transparent;
-    border-top: 1px solid var(--border);
-  }
-
-  .markdown-content table tr:nth-child(2n) {
-    background: var(--muted);
-    opacity: 0.5;
-  }
-
-  /* ========================================
-   * Images
-   * ======================================== */
-
-  .markdown-content img {
-    max-width: 100%;
-    height: auto;
-    border-radius: 0.5rem;
-  }
-
-  /* ========================================
-   * Embedded Content (iframes, videos)
-   * ======================================== */
-
-  .markdown-content iframe {
+  /* iframes (e.g., YouTube embeds, maps) */
+  iframe {
     max-width: 100%;
     border-radius: 0.5rem;
     border: 1px solid var(--border);
   }
 
-  /* ========================================
-   * Inline Elements
-   * No vertical spacing
-   * ======================================== */
-
-  .markdown-content strong {
-    font-weight: 600;
-  }
-
-  .markdown-content em {
-    font-style: italic;
-  }
-
-  .markdown-content code,
-  .markdown-content strong,
-  .markdown-content em,
-  .markdown-content a {
-    vertical-align: baseline;
-  }
-
-  /* Strikethrough (GFM) */
-  .markdown-content del {
-    text-decoration: line-through;
-  }
-
   /* Leaflet Popup Overrides */
   .leaflet-popup-content-wrapper {
     border-radius: 0.5rem !important;