diff --git a/src/renderer/App.tsx b/src/renderer/App.tsx
index 5fe41304..b61a9411 100644
--- a/src/renderer/App.tsx
+++ b/src/renderer/App.tsx
@@ -274,11 +274,24 @@ export function App() {
   useEffect(() => {
     if (!snapshot) return;
     const root = document.documentElement;
-    root.dataset.theme = snapshot.theme;
-    root.style.colorScheme = snapshot.theme === "system" ? "light dark" : snapshot.theme;
+    const applyTheme = () => {
+      const isDark = snapshot.theme === "dark" ||
+        (snapshot.theme === "system" && window.matchMedia("(prefers-color-scheme: dark)").matches);
+      root.classList.toggle("dark", isDark);
+      root.style.colorScheme = isDark ? "dark" : "light";
+    };
+
+    applyTheme();
+
     if (snapshot.locale && snapshot.locale !== locale) {
       setLocale(snapshot.locale);
     }
+
+    if (snapshot.theme === "system") {
+      const mq = window.matchMedia("(prefers-color-scheme: dark)");
+      mq.addEventListener("change", applyTheme);
+      return () => mq.removeEventListener("change", applyTheme);
+    }
   }, [snapshot, locale]);
 
   useEffect(() => {
diff --git a/src/renderer/main.tsx b/src/renderer/main.tsx
index aaf9dc0b..a8384756 100644
--- a/src/renderer/main.tsx
+++ b/src/renderer/main.tsx
@@ -1,6 +1,3 @@
-import "@fontsource-variable/inter";
-import "@fontsource-variable/jetbrains-mono";
-import "@fontsource/instrument-serif";
 import "./styles.css";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
diff --git a/src/renderer/styles.css b/src/renderer/styles.css
index ac6ab6a6..5e74710a 100644
--- a/src/renderer/styles.css
+++ b/src/renderer/styles.css
@@ -1,116 +1,780 @@
 @import "tailwindcss";
+@plugin "@tailwindcss/typography";
 
-@theme {
-  --font-sans: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI",
-    Roboto, "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
-    "Noto Sans CJK SC", Helvetica, Arial, sans-serif;
-  --font-serif: "Instrument Serif", Georgia, "Times New Roman", serif;
-  --font-mono: "JetBrains Mono Variable", "Microsoft YaHei", ui-monospace,
-    SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+@custom-variant dark (&:is(.dark *));
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --color-card: var(--card);
+  --color-card-foreground: var(--card-foreground);
+  --color-popover: var(--popover);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-primary: var(--primary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-secondary: var(--secondary);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-muted: var(--muted);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-accent: var(--accent);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-destructive: var(--destructive);
+  --color-destructive-foreground: var(--destructive-foreground);
+  --color-border: var(--border);
+  --color-input: var(--input);
+  --color-ring: var(--ring);
+  --color-chart-1: var(--chart-1);
+  --color-chart-2: var(--chart-2);
+  --color-chart-3: var(--chart-3);
+  --color-chart-4: var(--chart-4);
+  --color-chart-5: var(--chart-5);
+  --color-sidebar: var(--sidebar);
+  --color-sidebar-foreground: var(--sidebar-foreground);
+  --color-sidebar-primary: var(--sidebar-primary);
+  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+  --color-sidebar-accent: var(--sidebar-accent);
+  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+  --color-sidebar-border: var(--sidebar-border);
+  --color-sidebar-ring: var(--sidebar-ring);
+  --radius-sm: 0.375rem;
+  --radius-md: 0.5rem;
+  --radius-lg: 0px;
+  --radius-xl: 0px;
+  --font-sans: "Maple Mono", "Maple Mono NF CN", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Microsoft YaHei", "PingFang SC", sans-serif;
+  --font-mono: "Maple Mono NF CN", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
 }
 
-/* ─── Light theme — aligned with website ─── */
 :root {
   color-scheme: light;
-  --bg: #FBFAF5;
-  --bg-subtle: #FFFFFF;
-  --panel: #FFFFFF;
-  --panel-soft: #F3F2ED;
-  --panel-strong: #FBFAF5;
-  --line: rgba(25, 25, 25, 0.08);
-  --line-strong: rgba(25, 25, 25, 0.15);
-  --text: #191919;
-  --muted: #7a7a72;
-  --muted-strong: #565650;
-  --accent: #213448;
-  --accent-text: #213448;
-  --accent-soft: rgba(33, 52, 72, 0.07);
-  --accent-hover: #192838;
-  --text-on-accent: #FBFAF5;
-  --danger: #c53030;
-  --danger-soft: #fef2f2;
-  --warn: #b45309;
-  --warn-soft: #fffbeb;
-  --success: #0f766e;
-  --success-soft: #ecfdf5;
+  --radius: 0;
+  --background: oklch(1 0 0);
+  --foreground: oklch(0.145 0 0);
+  --card: oklch(1 0 0);
+  --card-foreground: oklch(0.145 0 0);
+  --popover: oklch(1 0 0);
+  --popover-foreground: oklch(0.145 0 0);
+  --primary: oklch(0.205 0 0);
+  --primary-foreground: oklch(0.985 0 0);
+  --secondary: oklch(0.97 0 0);
+  --secondary-foreground: oklch(0.205 0 0);
+  --muted: oklch(0.97 0 0);
+  --muted-foreground: oklch(0.556 0 0);
+  --accent: oklch(0.97 0 0);
+  --accent-foreground: oklch(0.205 0 0);
+  --destructive: oklch(0.577 0.245 27.325);
+  --destructive-foreground: oklch(0.577 0.245 27.325);
+  --border: oklch(0.922 0 0);
+  --input: oklch(0.922 0 0);
+  --ring: oklch(0.708 0 0);
+  --chart-1: oklch(0.646 0.222 41.116);
+  --chart-2: oklch(0.6 0.118 184.704);
+  --chart-3: oklch(0.398 0.07 227.392);
+  --chart-4: oklch(0.828 0.189 84.429);
+  --chart-5: oklch(0.769 0.188 70.08);
+  --sidebar: oklch(0.985 0 0);
+  --sidebar-foreground: oklch(0.145 0 0);
+  --sidebar-primary: oklch(0.205 0 0);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.97 0 0);
+  --sidebar-accent-foreground: oklch(0.205 0 0);
+  --sidebar-border: oklch(0.922 0 0);
+  --sidebar-ring: oklch(0.708 0 0);
 }
 
-:root[data-theme="light"] {
-  color-scheme: light;
+.dark {
+  --background: oklch(0.145 0 0);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.205 0 0);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.205 0 0);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.985 0 0);
+  --primary-foreground: oklch(0.205 0 0);
+  --secondary: oklch(0.269 0 0);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.269 0 0);
+  --muted-foreground: oklch(0.708 0 0);
+  --accent: oklch(0.269 0 0);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.637 0.237 25.331);
+  --destructive-foreground: oklch(0.985 0 0);
+  --border: oklch(0.269 0 0);
+  --input: oklch(0.269 0 0);
+  --ring: oklch(0.439 0 0);
+  --chart-1: oklch(0.488 0.243 264.376);
+  --chart-2: oklch(0.696 0.17 162.48);
+  --chart-3: oklch(0.769 0.188 70.08);
+  --chart-4: oklch(0.627 0.265 303.9);
+  --chart-5: oklch(0.645 0.246 16.439);
+  --sidebar: oklch(0.145 0 0);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.488 0.243 264.376);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.269 0 0);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(0.269 0 0);
+  --sidebar-ring: oklch(0.439 0 0);
 }
 
-/* ─── Dark theme — aligned with website ─── */
-:root[data-theme="dark"] {
-  color-scheme: dark;
-  --bg: #191919;
-  --bg-subtle: #1e1e1e;
-  --panel: #222222;
-  --panel-soft: #2a2a2a;
-  --panel-strong: #1c1c1c;
-  --line: rgba(251, 250, 245, 0.08);
-  --line-strong: rgba(251, 250, 245, 0.15);
-  --text: #FBFAF5;
-  --muted: #8a8a84;
-  --muted-strong: #b8b8b2;
-  --accent: #94B4C1;
-  --accent-text: #94B4C1;
-  --accent-soft: rgba(148, 180, 193, 0.12);
-  --accent-hover: #a8c4cf;
-  --text-on-accent: #191919;
-  --danger: #f87171;
-  --danger-soft: rgba(248, 113, 113, 0.12);
-  --warn: #f59e0b;
-  --warn-soft: rgba(245, 158, 11, 0.12);
-  --success: #34d399;
-  --success-soft: rgba(52, 211, 153, 0.12);
-}
-
-@media (prefers-color-scheme: dark) {
-  :root[data-theme="system"] {
-    color-scheme: dark;
-    --bg: #191919;
-    --bg-subtle: #1e1e1e;
-    --panel: #222222;
-    --panel-soft: #2a2a2a;
-    --panel-strong: #1c1c1c;
-    --line: rgba(251, 250, 245, 0.08);
-    --line-strong: rgba(251, 250, 245, 0.15);
-    --text: #FBFAF5;
-    --muted: #8a8a84;
-    --muted-strong: #b8b8b2;
-    --accent: #94B4C1;
-    --accent-text: #94B4C1;
-    --accent-soft: rgba(148, 180, 193, 0.12);
-    --accent-hover: #a8c4cf;
-    --text-on-accent: #191919;
-    --danger: #f87171;
-    --danger-soft: rgba(248, 113, 113, 0.12);
-    --warn: #f59e0b;
-    --warn-soft: rgba(245, 158, 11, 0.12);
-    --success: #34d399;
-    --success-soft: rgba(52, 211, 153, 0.12);
+@layer base {
+  * {
+    @apply border-border;
+  }
+  html {
+    height: 100%;
+    -webkit-tap-highlight-color: color-mix(in oklab, var(--foreground) 20%, transparent);
+  }
+  body {
+    @apply bg-background text-foreground antialiased;
+    height: 100%;
+    overflow: hidden;
+  }
+  h1,
+  h2,
+  h3 {
+    text-wrap: balance;
+  }
+  /* Prevent double-tap-to-zoom on interactive elements for mobile */
+  a,
+  button,
+  [role="button"],
+  input,
+  select,
+  textarea,
+  label {
+    touch-action: manipulation;
   }
 }
 
-html,
-body,
-#root {
-  min-height: 100dvh;
+@media (pointer: coarse) {
+  button,
+  [role="button"],
+  input,
+  select,
+  textarea,
+  [data-slot="select-trigger"] {
+    min-height: 44px;
+  }
+
+  [data-slot="toggle"] {
+    min-height: 0;
+  }
 }
 
-body {
+/* Dark mode scrollbars */
+.dark {
+  color-scheme: dark;
+}
+
+.dark *::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+.dark *::-webkit-scrollbar-track {
+  background: oklch(0.205 0 0);
+}
+
+.dark *::-webkit-scrollbar-thumb {
+  background: oklch(0.4 0 0);
+  border-radius: 4px;
+}
+
+.dark *::-webkit-scrollbar-thumb:hover {
+  background: oklch(0.5 0 0);
+}
+
+/* Auto-hide scrollbar: always reserves space, thumb visible only on hover */
+.scrollbar-auto-hide::-webkit-scrollbar {
+  width: 8px !important;
+  background: transparent !important;
+}
+.scrollbar-auto-hide::-webkit-scrollbar-track {
+  background: transparent !important;
+}
+.scrollbar-auto-hide::-webkit-scrollbar-thumb {
+  background: transparent !important;
+}
+.scrollbar-auto-hide:hover::-webkit-scrollbar-track {
+  background: oklch(0.205 0 0) !important;
+}
+.scrollbar-auto-hide:hover::-webkit-scrollbar-thumb {
+  background: oklch(0.4 0 0) !important;
+}
+.scrollbar-auto-hide:hover::-webkit-scrollbar-thumb:hover {
+  background: oklch(0.5 0 0) !important;
+}
+
+/* Expandable dialog transition for max-width changes */
+[data-slot="dialog-content"] {
+  transition: max-width 200ms cubic-bezier(0.16, 1, 0.3, 1);
+}
+
+/* Dashboard activity row entry motion */
+@keyframes dashboard-activity-enter {
+  0% {
+    opacity: 0;
+    transform: translateY(-14px) scale(0.985);
+    filter: blur(4px);
+  }
+  62% {
+    opacity: 1;
+    transform: translateY(2px) scale(1.002);
+    filter: blur(0);
+  }
+  100% {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+    filter: blur(0);
+  }
+}
+
+@keyframes dashboard-activity-highlight {
+  0% {
+    box-shadow: inset 2px 0 0 var(--primary);
+    background-color: color-mix(in oklab, var(--accent) 55%, transparent);
+  }
+  100% {
+    box-shadow: inset 0 0 0 transparent;
+    background-color: transparent;
+  }
+}
+
+.activity-row-enter {
+  animation:
+    dashboard-activity-enter 520ms cubic-bezier(0.16, 1, 0.3, 1),
+    dashboard-activity-highlight 920ms cubic-bezier(0.16, 1, 0.3, 1);
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .activity-row-enter {
+    animation: none;
+  }
+}
+
+/* MDXEditor theme integration */
+.paperclip-mdxeditor-scope,
+.paperclip-mdxeditor {
+  --baseBase: var(--background);
+  --baseBg: transparent;
+  --baseBgSubtle: color-mix(in oklab, var(--accent) 35%, transparent);
+  --baseLine: var(--border);
+  --baseSolid: var(--muted-foreground);
+  --baseSolidHover: var(--foreground);
+  --baseText: var(--muted-foreground);
+  --baseBorderColor: var(--border);
+  --baseBorder: var(--border);
+  --baseBorderHover: var(--ring);
+  --baseTextContrast: var(--foreground);
+  --baseTextContrastMuted: var(--muted-foreground);
+  --baseTextEmphasis: var(--foreground);
+  --basePageBg: var(--background);
+  --baseRadius: var(--radius);
+  --baseLineHeight: 1.5;
+  --accentBorder: color-mix(in oklab, var(--primary) 35%, var(--border));
+  --accentSolid: var(--primary);
+  --accentSolidHover: var(--primary);
+  --accentLine: color-mix(in oklab, var(--primary) 20%, transparent);
+  --accentBg: var(--accent);
+  --accentBgHover: color-mix(in oklab, var(--accent) 80%, var(--background));
+  --accentBgActive: color-mix(in oklab, var(--accent) 72%, var(--background));
+  --accentText: var(--accent-foreground);
+  font-family: inherit;
+  font-size: 0.875rem;
+  line-height: 1.5;
+  color: var(--foreground);
+}
+
+.paperclip-mdxeditor-scope [class*="_iconButton_"],
+.paperclip-mdxeditor [class*="_iconButton_"] {
+  color: var(--baseText);
+}
+
+.paperclip-mdxeditor-scope [class*="_iconButton_"]:hover,
+.paperclip-mdxeditor [class*="_iconButton_"]:hover {
+  color: var(--baseTextContrast);
+}
+
+.paperclip-mdxeditor .mdxeditor-root-contenteditable {
+  min-height: 2.5rem;
+  padding: 0;
+  line-height: 1.5;
+}
+
+.paperclip-mdxeditor [class*="_contentEditable_"] {
+  padding: 0.375rem 0.625rem !important;
+}
+
+.paperclip-mdxeditor--borderless [class*="_contentEditable_"] {
+  padding: 0 !important;
+}
+
+.paperclip-mdxeditor [class*="_placeholder_"] {
+  font-family: inherit;
+  font-size: 0.875rem;
+  line-height: 1.5;
+  color: var(--muted-foreground);
+}
+
+.paperclip-mdxeditor-content {
+  font-family: inherit;
+  font-size: inherit;
+  line-height: inherit;
+  color: inherit;
+}
+
+.paperclip-edit-in-place-content {
+  font-size: 0.9375rem;
+  line-height: 1.75rem;
+}
+
+.paperclip-mdxeditor-content > *:first-child {
+  margin-top: 0;
+}
+
+.paperclip-mdxeditor-content > *:last-child {
+  margin-bottom: 0;
+}
+
+.paperclip-mdxeditor-content p {
   margin: 0;
-  background: var(--bg);
-  color: var(--text);
-  font-family: var(--font-sans);
-  -webkit-font-smoothing: antialiased;
-  text-rendering: optimizeLegibility;
+  line-height: inherit;
 }
 
+.paperclip-mdxeditor-content p + p {
+  margin-top: 1.1em;
+}
+
+.paperclip-mdxeditor-content a.paperclip-mention-chip,
+.paperclip-mdxeditor-content a.paperclip-project-mention-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  margin: 0 0.1rem;
+  padding: 0.05rem 0.45rem;
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  font-size: 0.75rem;
+  line-height: 1.3;
+  text-decoration: none;
+  vertical-align: middle;
+  white-space: nowrap;
+  user-select: none;
+}
+
+.paperclip-mdxeditor-content a.paperclip-mention-chip::before,
+a.paperclip-mention-chip::before {
+  content: "";
+  flex: none;
+}
+
+.paperclip-mdxeditor-content a.paperclip-mention-chip[data-mention-kind="project"]::before,
+a.paperclip-mention-chip[data-mention-kind="project"]::before {
+  width: 0.45rem;
+  height: 0.45rem;
+  border-radius: 999px;
+  background-color: var(--paperclip-mention-project-color, currentColor);
+}
+
+.paperclip-mdxeditor-content a.paperclip-mention-chip[data-mention-kind="agent"]::before,
+a.paperclip-mention-chip[data-mention-kind="agent"]::before {
+  width: 0.75rem;
+  height: 0.75rem;
+  background-color: currentColor;
+  -webkit-mask-image: var(--paperclip-mention-icon-mask);
+  mask-image: var(--paperclip-mention-icon-mask);
+  -webkit-mask-position: center;
+  mask-position: center;
+  -webkit-mask-repeat: no-repeat;
+  mask-repeat: no-repeat;
+  -webkit-mask-size: contain;
+  mask-size: contain;
+}
+
+.paperclip-mdxeditor-content ul,
+.paperclip-mdxeditor-content ol {
+  margin: 1.1em 0;
+  padding-left: 1.6em;
+}
+
+.paperclip-mdxeditor-content ul {
+  list-style: disc;
+}
+
+.paperclip-mdxeditor-content ol {
+  list-style: decimal;
+}
+
+.paperclip-mdxeditor-content li {
+  display: list-item;
+  margin: 0.3em 0;
+  line-height: inherit;
+}
+
+.paperclip-mdxeditor-content li::marker {
+  color: var(--muted-foreground);
+}
+
+.paperclip-mdxeditor-content h1 {
+  margin: 1.4em 0 0.9em;
+  font-size: 1.75em;
+  font-weight: 700;
+  line-height: 1.2;
+}
+
+.paperclip-mdxeditor-content h2 {
+  margin: 1.3em 0 0.85em;
+  font-size: 1.35em;
+  font-weight: 700;
+  line-height: 1.3;
+}
+
+.paperclip-mdxeditor-content h3 {
+  margin: 1.2em 0 0.8em;
+  font-size: 1.15em;
+  font-weight: 600;
+  line-height: 1.35;
+}
+
+.paperclip-mdxeditor-content img {
+  max-height: 18rem;
+  border-radius: calc(var(--radius) - 2px);
+}
+
+.paperclip-mdxeditor-content blockquote {
+  margin: 1.2em 0;
+  padding-left: 1em;
+  border-left: 3px solid var(--border);
+  color: var(--muted-foreground);
+  line-height: inherit;
+}
+
+.paperclip-mdxeditor-content code {
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+  font-size: 1em;
+}
+
+.paperclip-mdxeditor-content pre {
+  margin: 0.4rem 0;
+  padding: 0;
+  border: 1px solid color-mix(in oklab, var(--foreground) 12%, transparent);
+  border-radius: calc(var(--radius) - 3px);
+  background: #1e1e2e;
+  color: #cdd6f4;
+  overflow-x: auto;
+}
+
+/* Dark theme for CodeMirror code blocks inside the MDXEditor.
+   Overrides the default cm6-theme-basic-light that MDXEditor bundles. */
+.paperclip-mdxeditor .cm-editor {
+  background-color: #1e1e2e !important;
+  color: #cdd6f4 !important;
+  font-size: 1em;
+}
+
+.paperclip-mdxeditor .cm-gutters {
+  background-color: #181825 !important;
+  color: #585b70 !important;
+  border-right: 1px solid #313244 !important;
+}
+
+.paperclip-mdxeditor .cm-activeLineGutter {
+  background-color: #1e1e2e !important;
+}
+
+.paperclip-mdxeditor .cm-activeLine {
+  background-color: color-mix(in oklab, #cdd6f4 5%, transparent) !important;
+}
+
+.paperclip-mdxeditor .cm-cursor,
+.paperclip-mdxeditor .cm-dropCursor {
+  border-left-color: #cdd6f4 !important;
+}
+
+.paperclip-mdxeditor .cm-selectionBackground {
+  background-color: color-mix(in oklab, #89b4fa 25%, transparent) !important;
+}
+
+.paperclip-mdxeditor .cm-focused .cm-selectionBackground {
+  background-color: color-mix(in oklab, #89b4fa 30%, transparent) !important;
+}
+
+.paperclip-mdxeditor .cm-content {
+  caret-color: #cdd6f4;
+}
+
+/* MDXEditor code block language selector -- show on hover only */
+.paperclip-mdxeditor-content [class*="_codeMirrorWrapper_"] {
+  position: relative;
+}
+
+.paperclip-mdxeditor-content [class*="_codeMirrorToolbar_"],
+.paperclip-mdxeditor-content [class*="_codeBlockToolbar_"] {
+  position: absolute;
+  top: 0.25rem;
+  right: 0.25rem;
+  z-index: 2;
+  opacity: 0;
+  transition: opacity 150ms ease;
+}
+
+.paperclip-mdxeditor-content [class*="_codeMirrorToolbar_"] select,
+.paperclip-mdxeditor-content [class*="_codeBlockToolbar_"] select {
+  background-color: #313244;
+  color: #cdd6f4;
+  border-color: #45475a;
+}
+
+.paperclip-mdxeditor-content [class*="_codeMirrorWrapper_"]:hover [class*="_codeMirrorToolbar_"],
+.paperclip-mdxeditor-content [class*="_codeMirrorWrapper_"]:hover [class*="_codeBlockToolbar_"],
+.paperclip-mdxeditor-content [class*="_codeMirrorWrapper_"]:focus-within [class*="_codeMirrorToolbar_"],
+.paperclip-mdxeditor-content [class*="_codeMirrorWrapper_"]:focus-within [class*="_codeBlockToolbar_"] {
+  opacity: 1;
+}
+
+/* Rendered markdown code blocks & inline code (prose/MarkdownBody context).
+   Dark theme code blocks with compact sizing.
+   Override prose CSS variables so prose-invert can't revert to defaults. */
+.paperclip-markdown {
+  --tw-prose-pre-bg: #1e1e2e;
+  --tw-prose-pre-code: #cdd6f4;
+  --tw-prose-invert-pre-bg: #1e1e2e;
+  --tw-prose-invert-pre-code: #cdd6f4;
+}
+
+.paperclip-markdown pre {
+  border: 1px solid color-mix(in oklab, var(--foreground) 12%, transparent) !important;
+  border-radius: calc(var(--radius) - 3px) !important;
+  background-color: #1e1e2e !important;
+  color: #cdd6f4 !important;
+  padding: 0.5rem 0.65rem !important;
+  margin: 0.4rem 0 !important;
+  font-size: 1em !important;
+  overflow-x: auto;
+  white-space: pre;
+}
+
+.paperclip-markdown code {
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+  font-size: 1em;
+}
+
+.paperclip-markdown pre code {
+  font-size: inherit;
+  color: inherit;
+  background: none;
+}
+
+/* Remove backtick pseudo-elements from inline code (prose default adds them) */
+.prose code::before,
+.prose code::after {
+  content: none;
+}
+
+/* Inline code background (not inside a code block) */
+.prose :not(pre) > code {
+  background-color: color-mix(in oklab, var(--accent) 60%, transparent);
+  padding: 0.15em 0.35em;
+  border-radius: 3px;
+  font-weight: 500;
+}
+
+.dark .prose :not(pre) > code {
+  background-color: #ffffff0f;
+}
+
+.paperclip-markdown {
+  color: var(--foreground);
+  font-size: 0.9375rem;
+  line-height: 1.6;
+}
+
+.paperclip-markdown > :first-child {
+  margin-top: 0;
+}
+
+.paperclip-markdown > :last-child {
+  margin-bottom: 0;
+}
+
+.paperclip-markdown :where(p, ul, ol, blockquote, pre, table) {
+  margin-top: 0.7rem;
+  margin-bottom: 0.7rem;
+}
+
+.paperclip-markdown :where(ul, ol) {
+  padding-left: 1.15rem;
+}
+
+.paperclip-markdown ul {
+  list-style-type: disc;
+}
+
+.paperclip-markdown ol {
+  list-style-type: decimal;
+}
+
+.paperclip-markdown li {
+  margin: 0.14rem 0;
+  padding-left: 0.2rem;
+}
+
+.paperclip-markdown li > :where(p, ul, ol) {
+  margin-top: 0.3rem;
+  margin-bottom: 0.3rem;
+}
+
+.paperclip-markdown li::marker {
+  color: var(--muted-foreground);
+}
+
+.paperclip-markdown h1,
+.paperclip-markdown h2,
+.paperclip-markdown h3,
+.paperclip-markdown h4 {
+  margin-top: 1.75rem;
+  margin-bottom: 0.45rem;
+  color: var(--foreground);
+  font-weight: 600;
+  letter-spacing: -0.01em;
+  line-height: 1.3;
+}
+
+.paperclip-markdown h1 {
+  font-size: 1.5rem;
+}
+
+.paperclip-markdown h2 {
+  font-size: 1.25rem;
+}
+
+.paperclip-markdown h3 {
+  font-size: 1.05rem;
+}
+
+.paperclip-markdown h4 {
+  font-size: 0.95rem;
+}
+
+.paperclip-markdown :where(strong, b) {
+  color: var(--foreground);
+  font-weight: 600;
+}
+
+.paperclip-markdown a {
+  color: color-mix(in oklab, var(--foreground) 76%, #0969da 24%);
+  text-decoration: none;
+}
+
+.paperclip-markdown a:hover {
+  text-decoration: underline;
+  text-underline-offset: 0.15em;
+}
+
+.dark .paperclip-markdown a {
+  color: color-mix(in oklab, var(--foreground) 80%, #58a6ff 20%);
+}
+
+.paperclip-markdown blockquote {
+  margin-left: 0;
+  padding-left: 0.95rem;
+  border-left: 0.24rem solid color-mix(in oklab, var(--border) 84%, var(--muted-foreground) 16%);
+  color: var(--muted-foreground);
+}
+
+.paperclip-markdown hr {
+  margin: 1.25rem 0;
+  border-color: var(--border);
+}
+
+.paperclip-markdown img {
+  border-radius: calc(var(--radius) + 2px);
+  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--foreground) 10%, transparent);
+}
+
+.paperclip-markdown table {
+  width: 100%;
+}
+
+.paperclip-markdown th {
+  font-weight: 600;
+  text-align: left;
+}
+
+.paperclip-mermaid {
+  margin: 0.5rem 0;
+  padding: 0.45rem 0.55rem;
+  border: 1px solid var(--border);
+  border-radius: calc(var(--radius) - 3px);
+  background-color: color-mix(in oklab, var(--accent) 35%, transparent);
+  overflow-x: auto;
+}
+
+.paperclip-mermaid svg {
+  display: block;
+  width: max-content;
+  max-width: none;
+  min-width: 100%;
+  height: auto;
+}
+
+.paperclip-mermaid-status {
+  margin: 0 0 0.45rem;
+  font-size: 0.75rem;
+  color: var(--muted-foreground);
+}
+
+.paperclip-mermaid-status-error {
+  color: var(--destructive);
+}
+
+.paperclip-mermaid-source {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  background: transparent;
+}
+
+/* Project mention chips rendered inside MarkdownBody */
+a.paperclip-mention-chip,
+a.paperclip-project-mention-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  margin: 0 0.1rem;
+  padding: 0.05rem 0.45rem;
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  font-size: 0.75rem;
+  line-height: 1.3;
+  text-decoration: none;
+  vertical-align: middle;
+  white-space: nowrap;
+}
+
+/* Keep MDXEditor popups above app dialogs, even when they portal to <body>. */
+[class*="_popupContainer_"] {
+  z-index: 81 !important;
+}
+
+[class*="_dialogOverlay_"] {
+  z-index: 80;
+}
+
+[class*="_dialogContent_"],
+[class*="_largeDialogContent_"],
+[class*="_popoverContent_"],
+[class*="_linkDialogPopoverContent_"],
+[class*="_tableColumnEditorPopoverContent_"],
+[class*="_toolbarButtonDropdownContainer_"],
+[class*="_toolbarNodeKindSelectContainer_"] {
+  z-index: 81 !important;
+}
+
+/* Electron window drag region -- CRITICAL */
 .sidebar-drag {
   -webkit-app-region: drag;
 }
-
 .sidebar-drag button,
 .sidebar-drag select,
 .sidebar-drag input,
@@ -118,57 +782,7 @@ body {
   -webkit-app-region: no-drag;
 }
 
-* {
-  box-sizing: border-box;
-}
-
-button,
-input,
-textarea,
-select {
-  font: inherit;
-}
-
-::-webkit-scrollbar {
-  width: 10px;
-  height: 10px;
-}
-
-::-webkit-scrollbar-thumb {
-  border-radius: 999px;
-  background: rgba(25, 25, 25, 0.15);
-}
-
-::-webkit-scrollbar-thumb:hover {
-  background: rgba(25, 25, 25, 0.25);
-}
-
-.mono {
-  font-family: var(--font-mono);
-}
-
-.surface {
-  background: var(--panel);
-  border: 1px solid var(--line);
-  box-shadow: 0 1px 3px rgba(25, 25, 25, 0.06), 0 0 0 0.5px rgba(25, 25, 25, 0.03);
-}
-
-.focus-ring {
-  outline: none;
-  transition:
-    box-shadow 180ms cubic-bezier(0.16, 1, 0.3, 1),
-    border-color 180ms cubic-bezier(0.16, 1, 0.3, 1),
-    transform 120ms cubic-bezier(0.16, 1, 0.3, 1);
-}
-
-.focus-ring:focus-visible {
-  box-shadow:
-    0 0 0 1px rgba(33, 52, 72, 0.5),
-    0 0 0 4px rgba(33, 52, 72, 0.12);
-  border-color: rgba(33, 52, 72, 0.35);
-}
-
-/* ─── ASCII animation ─── */
+/* ASCII animation */
 @keyframes ascii-scroll-up {
   0% { transform: translateY(0); }
   100% { transform: translateY(-50%); }