diff --git a/docs/book.toml b/docs/book.toml
index d9129e2..2bf715b 100644
--- a/docs/book.toml
+++ b/docs/book.toml
@@ -1,5 +1,5 @@
 [book]
-title = "Kaptan Developer Manual"
+title = "Kaptan documentation"
 description = "Architecture, board bring-up, simulation, and contributor guidance for Kaptan."
 authors = ["Kaptan contributors"]
 language = "en"
diff --git a/docs/src/SUMMARY.md b/docs/src/SUMMARY.md
index 356a602..1a4381c 100644
--- a/docs/src/SUMMARY.md
+++ b/docs/src/SUMMARY.md
@@ -1,6 +1,6 @@
 # Summary
 
-- [Kaptan Developer Manual](index.md)
+- [Kaptan documentation](index.md)
 - [Getting started](getting-started.md)
 - [Architecture](architecture.md)
   - [Safety boundary](safety-boundary.md)
diff --git a/docs/theme/lore.css b/docs/theme/lore.css
index e80a272..d3826cb 100644
--- a/docs/theme/lore.css
+++ b/docs/theme/lore.css
@@ -1,6 +1,6 @@
 /*
- * Static, text-first presentation inspired by lore.kernel.org.
- * Palette: Orkavian's published black, silver, and green site tokens.
+ * A static documentation layout: kernel-docs navigation with lore-like
+ * restraint. Colours follow Orkavian's black, silver, and green palette.
  */
 :root,
 html.light,
@@ -8,18 +8,18 @@ html.rust,
 html.coal,
 html.navy,
 html.ayu {
-    --background: #050505;
-    --background-secondary: #0a0a0a;
-    --text: #cccccc;
-    --text-muted: #888888;
-    --accent: #00ff41;
-    --border: #333333;
+    --kaptan-background: #050505;
+    --kaptan-surface: #0a0a0a;
+    --kaptan-text: #cccccc;
+    --kaptan-muted: #888888;
+    --kaptan-accent: #00ff41;
+    --kaptan-border: #333333;
 }
 
 html,
 body {
-    background: var(--background);
-    color: var(--text);
+    background: var(--kaptan-background);
+    color: var(--kaptan-text);
     font-family: "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Monaco,
         Consolas, "Liberation Mono", monospace;
     font-size: 15px;
@@ -33,48 +33,87 @@ body {
     transition: none !important;
 }
 
-/* Replace mdBook's interactive chrome with a quiet, static masthead. */
-#mdbook-sidebar,
+/* The book remains static: no help, theme picker, resizing, or search UI. */
+#mdbook-help-container,
 #mdbook-sidebar-toggle-anchor,
 #mdbook-menu-bar-hover-placeholder,
-#mdbook-help-container,
 #mdbook-menu-bar .left-buttons,
-#mdbook-menu-bar .right-buttons {
+#mdbook-menu-bar .right-buttons,
+#mdbook-sidebar-resize-handle {
     display: none !important;
 }
 
-#mdbook-page-wrapper,
-.page-wrapper,
-.page {
-    margin-left: 0 !important;
-    transform: none !important;
-}
-
 #mdbook-menu-bar {
-    background: var(--background-secondary);
-    border-bottom: 1px solid var(--border);
-    display: block;
+    background: var(--kaptan-surface);
+    border-bottom: 1px solid var(--kaptan-border);
     height: auto;
     margin: 0;
     min-height: 0;
-    padding: 0.55rem max(1rem, calc((100vw - 78ch) / 2));
+    padding: 0.65rem 1.25rem;
     position: static;
 }
 
 #mdbook-menu-bar .menu-title {
-    color: var(--text);
+    color: var(--kaptan-text);
     font-family: inherit;
     font-size: 0.85rem;
     font-weight: 700;
     letter-spacing: 0.08em;
-    line-height: 1.4;
+    line-height: 1.35;
     text-transform: uppercase;
 }
 
+#mdbook-sidebar {
+    background: var(--kaptan-surface);
+    border-right: 1px solid var(--kaptan-border);
+    box-sizing: border-box;
+    display: none !important;
+    overflow-y: auto;
+}
+
+.sidebar-scrollbox {
+    padding: 0.75rem 0;
+}
+
+.sidebar-scrollbox ol {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+}
+
+.sidebar-scrollbox .chapter-item {
+    margin: 0;
+}
+
+.sidebar-scrollbox .chapter-item a {
+    color: var(--kaptan-text);
+    display: block;
+    font-size: 0.85rem;
+    line-height: 1.45;
+    padding: 0.3rem 1rem;
+    text-decoration: none;
+}
+
+.sidebar-scrollbox .chapter-item a:hover,
+.sidebar-scrollbox .chapter-item a.active {
+    background: transparent;
+    color: var(--kaptan-accent);
+}
+
+.sidebar-scrollbox .section .chapter-item a {
+    padding-left: 2rem;
+}
+
+.sidebar-scrollbox strong {
+    color: var(--kaptan-muted);
+    font-weight: 400;
+}
+
 .content {
+    box-sizing: border-box;
     margin: 0 auto;
-    max-width: 78ch;
-    padding: 1.75rem 1rem 3rem;
+    max-width: 84ch;
+    padding: 2rem 1.5rem 3rem;
 }
 
 .content main {
@@ -86,19 +125,19 @@ h1,
 h2,
 h3,
 h4 {
-    color: var(--text);
+    color: var(--kaptan-text);
     font-family: inherit;
     font-weight: 700;
     line-height: 1.35;
 }
 
 h1 {
-    font-size: 1.25rem;
+    font-size: 1.35rem;
     margin: 0 0 1.25rem;
 }
 
 h2 {
-    border-bottom: 1px solid var(--border);
+    border-bottom: 1px solid var(--kaptan-border);
     font-size: 1rem;
     margin: 2rem 0 0.75rem;
     padding-bottom: 0.35rem;
@@ -111,7 +150,7 @@ h4 {
 }
 
 a {
-    color: var(--accent);
+    color: var(--kaptan-accent);
     text-decoration: underline;
     text-underline-offset: 0.15em;
 }
@@ -146,14 +185,14 @@ kbd {
 }
 
 code {
-    background: var(--background-secondary);
-    color: var(--text);
+    background: var(--kaptan-surface);
+    color: var(--kaptan-text);
     padding: 0.05rem 0.25rem;
 }
 
 pre {
-    background: var(--background-secondary);
-    border: 1px solid var(--border);
+    background: var(--kaptan-surface);
+    border: 1px solid var(--kaptan-border);
     overflow-x: auto;
     padding: 0.75rem;
 }
@@ -169,31 +208,24 @@ table {
 
 th,
 td {
-    border: 1px solid var(--border);
+    border: 1px solid var(--kaptan-border);
     padding: 0.35rem 0.5rem;
     text-align: left;
 }
 
 th {
-    color: var(--text);
     font-weight: 700;
 }
 
 blockquote {
-    border-left: 2px solid var(--border);
-    color: var(--text-muted);
+    border-left: 2px solid var(--kaptan-border);
+    color: var(--kaptan-muted);
     margin-left: 0;
     padding-left: 0.8rem;
 }
 
-hr {
-    border: 0;
-    border-top: 1px solid var(--border);
-    margin: 1.5rem 0;
-}
-
 .nav-wrapper {
-    border-top: 1px solid var(--border);
+    border-top: 1px solid var(--kaptan-border);
     margin-top: 2rem;
     padding-top: 0.75rem;
 }
@@ -203,7 +235,33 @@ hr {
 }
 
 .nav-chapters a {
-    color: var(--accent);
+    color: var(--kaptan-accent);
+}
+
+@media (min-width: 900px) {
+    #mdbook-sidebar {
+        bottom: 0;
+        display: block !important;
+        left: 0;
+        position: fixed;
+        top: 0;
+        transform: none !important;
+        width: 17.5rem;
+    }
+
+    #mdbook-page-wrapper,
+    .page-wrapper {
+        margin-left: 17.5rem !important;
+        transform: none !important;
+    }
+}
+
+@media (max-width: 899px) {
+    #mdbook-page-wrapper,
+    .page-wrapper {
+        margin-left: 0 !important;
+        transform: none !important;
+    }
 }
 
 @media print {
@@ -213,8 +271,9 @@ hr {
         color: #000000;
     }
 
-    #mdbook-menu-bar {
-        display: none;
+    #mdbook-menu-bar,
+    #mdbook-sidebar {
+        display: none !important;
     }
 
     a {