diff --git a/frontend/src/components/react/AssetsButton.tsx b/frontend/src/components/react/AssetsButton.tsx
index 2b507ec..22b0165 100644
--- a/frontend/src/components/react/AssetsButton.tsx
+++ b/frontend/src/components/react/AssetsButton.tsx
@@ -8,7 +8,7 @@ interface Props {
 }
 
 export default function AssetsButton({
-  className = 'inline-flex items-center gap-2 bg-surface0 hover:bg-surface1 text-subtext1 hover:text-text px-3 py-2 rounded-lg border border-surface1 transition-colors text-sm',
+  className = 'btn btn--ghost',
   label = 'Assets',
   iconSize = 14,
 }: Props) {
@@ -89,8 +89,7 @@ export default function AssetsButton({
                 type="button"
                 onClick={() => setOpen(false)}
                 aria-label="Close"
-                className="p-1.5 text-[var(--subtext0)] hover:text-[var(--text)] hover:bg-[var(--surface0)] transition-colors"
-                style={{ borderRadius: 2 }}
+                className="btn btn--ghost btn--icon btn--sm"
               >
                 <svg
                   xmlns="http://www.w3.org/2000/svg"
diff --git a/frontend/src/components/react/ContactForm.tsx b/frontend/src/components/react/ContactForm.tsx
index 40aea37..b578278 100644
--- a/frontend/src/components/react/ContactForm.tsx
+++ b/frontend/src/components/react/ContactForm.tsx
@@ -169,7 +169,7 @@ export default function ContactForm() {
       <button
         type="submit"
         disabled={status === 'sending'}
-        className="btn-stamp disabled:opacity-60"
+        className="btn btn--primary"
       >
         {status === 'sending' ? 'Sending…' : 'Send message'}
       </button>
diff --git a/frontend/src/components/react/DeletePostButton.tsx b/frontend/src/components/react/DeletePostButton.tsx
index 45ac22e..0434bd4 100644
--- a/frontend/src/components/react/DeletePostButton.tsx
+++ b/frontend/src/components/react/DeletePostButton.tsx
@@ -31,7 +31,7 @@ export default function DeletePostButton({ slug, title, variant = 'full' }: Prop
         disabled={busy}
         title="Delete post"
         aria-label="Delete post"
-        className="p-2 rounded-md bg-surface0/80 hover:bg-red/20 text-subtext0 hover:text-red border border-surface1 transition-colors disabled:opacity-50"
+        className="btn btn--danger btn--icon btn--sm"
       >
         <svg
           xmlns="http://www.w3.org/2000/svg"
@@ -60,7 +60,7 @@ export default function DeletePostButton({ slug, title, variant = 'full' }: Prop
       type="button"
       onClick={handleClick}
       disabled={busy}
-      className="inline-flex items-center gap-2 bg-surface0 hover:bg-red/15 text-subtext1 hover:text-red px-3 py-1.5 md:px-4 md:py-2 rounded-md border border-surface1 hover:border-red/30 transition-colors text-sm disabled:opacity-50"
+      className="btn btn--danger btn--sm"
     >
       <svg
         xmlns="http://www.w3.org/2000/svg"
diff --git a/frontend/src/components/react/PostList.tsx b/frontend/src/components/react/PostList.tsx
index 9688bdf..ccac36a 100644
--- a/frontend/src/components/react/PostList.tsx
+++ b/frontend/src/components/react/PostList.tsx
@@ -197,8 +197,7 @@ export default function PostList({ posts: initialPosts, isAdmin = false }: Props
                   onClick={e => e.stopPropagation()}
                   title="Edit"
                   aria-label={`Edit ${displayTitle}`}
-                  className="p-1.5 bg-[var(--mantle)] text-[var(--rosewater)] hover:bg-[var(--blue)] border border-[var(--surface2)] transition-colors"
-                  style={{ borderRadius: 1 }}
+                  className="btn btn--ghost btn--icon btn--sm"
                 >
                   <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M17 3a2.85 2.83 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5Z" /><path d="m15 5 4 4" /></svg>
                 </a>
@@ -208,8 +207,7 @@ export default function PostList({ posts: initialPosts, isAdmin = false }: Props
                   disabled={isDeleting}
                   title="Remove"
                   aria-label={`Remove ${displayTitle}`}
-                  className="p-1.5 bg-[var(--mantle)] text-[var(--rosewater)] hover:bg-[var(--red)] border border-[var(--surface2)] transition-colors disabled:opacity-50"
-                  style={{ borderRadius: 1 }}
+                  className="btn btn--danger btn--icon btn--sm"
                 >
                   <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M3 6h18" /><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6" /><path d="M8 6V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2" /><line x1="10" x2="10" y1="11" y2="17" /><line x1="14" x2="14" y1="11" y2="17" /></svg>
                 </button>
diff --git a/frontend/src/components/react/admin/AssetManager.tsx b/frontend/src/components/react/admin/AssetManager.tsx
index 0ffec2f..60c0d58 100644
--- a/frontend/src/components/react/admin/AssetManager.tsx
+++ b/frontend/src/components/react/admin/AssetManager.tsx
@@ -109,8 +109,7 @@ export default function AssetManager({ mode = 'manage', onSelect }: Props) {
                   {mode === 'select' && onSelect && (
                     <button
                       onClick={() => onSelect(asset)}
-                      className="bg-[var(--mauve)] hover:bg-[var(--red)] text-[var(--rosewater)] px-4 py-2 text-sm font-display italic font-medium transition-colors shadow-lg inline-flex items-center gap-1.5"
-                      style={{ borderRadius: 1 }}
+                      className="btn btn--primary btn--sm"
                     >
                       <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><path d="M5 12h14"/><path d="m12 5 7 7-7 7"/></svg>
                       Insert
@@ -118,8 +117,7 @@ export default function AssetManager({ mode = 'manage', onSelect }: Props) {
                   )}
                   <button
                     onClick={() => handleDelete(asset.name)}
-                    className="bg-[var(--red)]/80 hover:bg-[var(--red)] text-[var(--rosewater)] p-2.5 transition-colors shadow-lg"
-                    style={{ borderRadius: 1 }}
+                    className="btn btn--danger btn--icon btn--sm"
                   >
                     <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M3 6h18"/><path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"/><path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2"/></svg>
                   </button>
diff --git a/frontend/src/components/react/admin/Editor.tsx b/frontend/src/components/react/admin/Editor.tsx
index 024ff26..20179ed 100644
--- a/frontend/src/components/react/admin/Editor.tsx
+++ b/frontend/src/components/react/admin/Editor.tsx
@@ -415,11 +415,11 @@ export default function Editor({ editSlug }: Props) {
       {/* Actions bar */}
       <div className="flex flex-wrap gap-4 mb-6">
         {originalSlug && (
-          <button onClick={handleDelete} className="btn-ghost py-3 px-6 text-[var(--red)] border-[var(--red)]/40 hover:bg-[var(--red)]/10 hover:border-[var(--red)] hover:text-[var(--red)]">
+          <button onClick={handleDelete} className="btn btn--danger">
             Remove
           </button>
         )}
-        <button onClick={handleSave} className="btn-stamp py-3 px-8 whitespace-nowrap">
+        <button onClick={handleSave} className="btn btn--primary">
           Save work
         </button>
         {originalSlug && (
@@ -427,7 +427,7 @@ export default function Editor({ editSlug }: Props) {
             href={`/posts/${encodeURIComponent(originalSlug)}`}
             target="_blank"
             rel="noreferrer"
-            className="btn-ghost py-3 px-6 inline-flex items-center justify-center gap-2 whitespace-nowrap"
+            className="btn btn--ghost"
           >
             <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"/><polyline points="15 3 21 3 21 9"/><line x1="10" y1="14" x2="21" y2="3"/></svg>
             View work
@@ -521,12 +521,7 @@ export default function Editor({ editSlug }: Props) {
             <button
               type="button"
               onClick={() => setVimEnabled(v => !v)}
-              className={`text-xs px-3 py-1.5 border transition-colors font-mono ${
-                vimEnabled
-                  ? 'bg-[var(--mauve)]/20 text-[var(--mauve)] border-[var(--mauve)]/30'
-                  : 'bg-[var(--surface0)] text-[var(--subtext0)] border-[var(--surface2)] hover:text-[var(--text)]'
-              }`}
-              style={{ borderRadius: 2 }}
+              className={`btn btn--sm${vimEnabled ? ' is-active' : ''}`}
               title={vimEnabled ? 'Vim mode ON' : 'Vim mode OFF'}
             >
               {vimEnabled ? 'VIM' : 'vim'}
@@ -534,19 +529,14 @@ export default function Editor({ editSlug }: Props) {
             <button
               type="button"
               onClick={() => setShowPreview(p => !p)}
-              className={`text-xs px-3 py-1.5 border transition-colors ${
-                showPreview
-                  ? 'bg-[var(--blue)]/20 text-[var(--blue)] border-[var(--blue)]/30'
-                  : 'bg-[var(--surface0)] text-[var(--subtext0)] border-[var(--surface2)] hover:text-[var(--text)]'
-              }`}
-              style={{ borderRadius: 2 }}
+              className={`btn btn--sm${showPreview ? ' is-active' : ''}`}
             >
               {showPreview ? 'Hide Preview' : 'Show Preview'}
             </button>
             <button
               type="button"
               onClick={() => setShowModal(true)}
-              className="btn-stamp text-sm py-1.5 px-4"
+              className="btn btn--primary btn--sm"
               title="Insert an image — also: drag an image into the editor, or paste from clipboard"
             >
               <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><rect width="18" height="18" x="3" y="3" rx="2" ry="2"/><circle cx="9" cy="9" r="2"/><path d="m21 15-3.086-3.086a2 2 0 0 0-2.828 0L6 21"/></svg>
@@ -563,11 +553,7 @@ export default function Editor({ editSlug }: Props) {
               role="tab"
               aria-selected={mobileView === 'edit'}
               onClick={() => setMobileView('edit')}
-              className={`flex-1 text-xs px-3 py-2 rounded border transition-colors ${
-                mobileView === 'edit'
-                  ? 'bg-blue/20 text-blue border-blue/30'
-                  : 'bg-surface0 text-subtext0 border-surface1 hover:text-text'
-              }`}
+              className={`btn btn--sm flex-1${mobileView === 'edit' ? ' is-active' : ''}`}
             >
               Edit
             </button>
@@ -576,11 +562,7 @@ export default function Editor({ editSlug }: Props) {
               role="tab"
               aria-selected={mobileView === 'preview'}
               onClick={() => setMobileView('preview')}
-              className={`flex-1 text-xs px-3 py-2 rounded border transition-colors ${
-                mobileView === 'preview'
-                  ? 'bg-blue/20 text-blue border-blue/30'
-                  : 'bg-surface0 text-subtext0 border-surface1 hover:text-text'
-              }`}
+              className={`btn btn--sm flex-1${mobileView === 'preview' ? ' is-active' : ''}`}
             >
               Preview
             </button>
@@ -679,7 +661,7 @@ export default function Editor({ editSlug }: Props) {
                 <h2 className="font-display italic text-2xl md:text-3xl text-[var(--text)] leading-tight">Add image</h2>
                 <p className="text-xs text-[var(--subtext0)] font-display italic mt-1">Click an image to insert it. Drag new files in to upload.</p>
               </div>
-              <button onClick={closeAssetModal} className="p-2 text-[var(--subtext0)] hover:text-[var(--red)] transition-colors">
+              <button onClick={closeAssetModal} className="btn btn--ghost btn--icon btn--sm">
                 <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M18 6 6 18"/><path d="m6 6 12 12"/></svg>
               </button>
             </header>
diff --git a/frontend/src/components/react/admin/Inbox.tsx b/frontend/src/components/react/admin/Inbox.tsx
index 5d24d88..7280608 100644
--- a/frontend/src/components/react/admin/Inbox.tsx
+++ b/frontend/src/components/react/admin/Inbox.tsx
@@ -120,7 +120,7 @@ export default function Inbox() {
                   {m.email && (
                     <a
                       href={`mailto:${m.email}${m.subject ? `?subject=${encodeURIComponent('Re: ' + m.subject)}` : ''}`}
-                      className="chip chip-accent uppercase"
+                      className="btn btn--ghost btn--sm"
                     >
                       Reply
                     </a>
@@ -128,7 +128,7 @@ export default function Inbox() {
                   <button
                     type="button"
                     onClick={() => remove(m.id)}
-                    className="chip text-[var(--red)]"
+                    className="btn btn--danger btn--sm"
                   >
                     Delete
                   </button>
diff --git a/frontend/src/components/react/admin/Login.tsx b/frontend/src/components/react/admin/Login.tsx
index db3e1e5..fbf28a4 100644
--- a/frontend/src/components/react/admin/Login.tsx
+++ b/frontend/src/components/react/admin/Login.tsx
@@ -65,7 +65,7 @@ export default function Login() {
           <button
             type="submit"
             disabled={busy}
-            className="btn-stamp w-full justify-center disabled:opacity-60 disabled:cursor-not-allowed"
+            className="btn btn--primary btn--block"
           >
             {busy ? 'Unlocking…' : 'Enter'}
           </button>
diff --git a/frontend/src/components/react/admin/Settings.tsx b/frontend/src/components/react/admin/Settings.tsx
index 77d7e0b..cb63232 100644
--- a/frontend/src/components/react/admin/Settings.tsx
+++ b/frontend/src/components/react/admin/Settings.tsx
@@ -215,7 +215,7 @@ export default function Settings() {
         <Field label="Footer text" value={config.footer || ''} onChange={v => update('footer', v)} />
       </section>
 
-      <button type="submit" className="btn-stamp">
+      <button type="submit" className="btn btn--primary">
         Save site settings
       </button>
     </form>
diff --git a/frontend/src/pages/404.astro b/frontend/src/pages/404.astro
index e39601d..56c4a4f 100644
--- a/frontend/src/pages/404.astro
+++ b/frontend/src/pages/404.astro
@@ -19,6 +19,6 @@ import Layout from '../layouts/Layout.astro';
             The room you reached for has either been re-hung, withdrawn,<br class="hidden md:block" />
             or never made it to the wall in the first place.
         </p>
-        <a href="/" class="btn-stamp">↶ Return to the catalogue</a>
+        <a href="/" class="btn btn--primary">↶ Return to the catalogue</a>
     </div>
 </Layout>
diff --git a/frontend/src/pages/index.astro b/frontend/src/pages/index.astro
index b8d95a0..9866d90 100644
--- a/frontend/src/pages/index.astro
+++ b/frontend/src/pages/index.astro
@@ -96,16 +96,16 @@ const isAdmin = Astro.cookies.get('admin_session')?.value === '1';
 
 				{isAdmin && (
 					<div class="mt-8 flex flex-wrap items-center gap-3">
-						<a href="/admin/editor" class="btn-stamp">
+						<a href="/admin/editor" class="btn btn--primary">
 							<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 12h14"/><path d="M12 5v14"/></svg>
 							New work
 						</a>
-						<AssetsButton client:idle className="btn-ghost" iconSize={12} />
-						<a href="/admin/messages" class="btn-ghost">
+						<AssetsButton client:idle className="btn btn--ghost btn--sm" iconSize={12} />
+						<a href="/admin/messages" class="btn btn--ghost">
 							<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z"/><polyline points="22,6 12,13 2,6"/></svg>
 							Messages
 						</a>
-						<a href="/admin/settings" class="btn-ghost">
+						<a href="/admin/settings" class="btn btn--ghost">
 							<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="12" r="3"/><path d="M12.22 2h-.44a2 2 0 0 0-2 2v.18a2 2 0 0 1-1 1.73l-.43.25a2 2 0 0 1-2 0l-.15-.08a2 2 0 0 0-2.73.73l-.22.38a2 2 0 0 0 .73 2.73l.15.1a2 2 0 0 1 1 1.72v.51a2 2 0 0 1-1 1.74l-.15.09a2 2 0 0 0-.73 2.73l.22.38a2 2 0 0 0 2.73.73l.15-.08a2 2 0 0 1 2 0l.43.25a2 2 0 0 1 1 1.73V20a2 2 0 0 0 2 2h.44a2 2 0 0 0 2-2v-.18a2 2 0 0 1 1-1.73l.43-.25a2 2 0 0 1 2 0l.15.08a2 2 0 0 0 2.73-.73l.22-.39a2 2 0 0 0-.73-2.73l-.15-.08a2 2 0 0 1-1-1.74v-.5a2 2 0 0 1 1-1.74l.15-.09a2 2 0 0 0 .73-2.73l-.22-.38a2 2 0 0 0-2.73-.73l-.15.08a2 2 0 0 1-2 0l-.43-.25a2 2 0 0 1-1-1.73V4a2 2 0 0 0-2-2z"/></svg>
 							Settings
 						</a>
@@ -128,7 +128,7 @@ const isAdmin = Astro.cookies.get('admin_session')?.value === '1';
 			</p>
 			<p class="font-sans text-[var(--subtext1)] mt-4">Check back soon.</p>
 			{isAdmin && (
-				<a href="/admin/editor" class="btn-stamp mt-8">Create the first post</a>
+				<a href="/admin/editor" class="btn btn--primary mt-8">Create the first post</a>
 			)}
 		</div>
 	)}
diff --git a/frontend/src/pages/posts/[slug].astro b/frontend/src/pages/posts/[slug].astro
index bd4c80e..0ce26b7 100644
--- a/frontend/src/pages/posts/[slug].astro
+++ b/frontend/src/pages/posts/[slug].astro
@@ -84,7 +84,7 @@ const displayTitle = post ? (post.title || formatSlug(post.slug)) : 'Work';
     <div class="max-w-2xl mx-auto py-20 md:py-32 text-center">
       <div class="font-display italic text-[var(--subtext0)] text-sm tracking-[0.3em] uppercase mb-4">Pardon —</div>
       <h2 class="font-display italic text-3xl md:text-5xl text-[var(--mauve)] mb-6 leading-tight">{error}</h2>
-      <a href="/" class="btn-ghost">← Return to the catalogue</a>
+      <a href="/" class="btn btn--ghost">← Return to the catalogue</a>
     </div>
   )}
 
@@ -99,7 +99,7 @@ const displayTitle = post ? (post.title || formatSlug(post.slug)) : 'Work';
 
         {isAdmin && (
           <div class="flex items-center gap-2">
-            <a href={`/admin/editor?edit=${encodeURIComponent(post.slug)}`} class="btn-ghost">
+            <a href={`/admin/editor?edit=${encodeURIComponent(post.slug)}`} class="btn btn--ghost">
               <svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M17 3a2.85 2.83 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5Z"/><path d="m15 5 4 4"/></svg>
               Edit
             </a>
diff --git a/frontend/src/styles/global.css b/frontend/src/styles/global.css
index 71d1860..bc01371 100644
--- a/frontend/src/styles/global.css
+++ b/frontend/src/styles/global.css
@@ -914,58 +914,98 @@ code, pre, kbd, samp {
     0 14px 40px -24px rgba(0, 0, 0, 0.9);
 }
 
-/* ───── Buttons ───── */
-.btn-stamp {
+/* ───── Buttons — one system ─────
+ * Base .btn = layout + size + focus/disabled. One variant for color
+ * (--primary / --ghost / --danger), one size modifier (--sm / --lg),
+ * shape modifiers (--icon / --block). Never restyle buttons ad-hoc. */
+.btn {
   display: inline-flex;
   align-items: center;
+  justify-content: center;
   gap: 0.5rem;
+  height: 2.5rem;
+  padding: 0 1.2rem;
   font-family: var(--font-display);
   font-style: italic;
   font-weight: 500;
   font-size: 0.95rem;
-  padding: 0.55rem 1.2rem;
+  line-height: 1;
+  letter-spacing: 0.02em;
+  background: transparent;
+  color: var(--text);
+  border: 1px solid transparent;
+  border-radius: 1px;
+  text-decoration: none;
+  white-space: nowrap;
+  cursor: pointer;
+  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease,
+              border-color 0.15s ease, box-shadow 0.15s ease;
+}
+.btn:focus-visible {
+  outline: none;
+  border-color: var(--mauve);
+  box-shadow: 0 0 0 2px color-mix(in srgb, var(--mauve) 35%, transparent);
+}
+.btn:disabled,
+.btn[aria-disabled="true"] {
+  opacity: 0.55;
+  cursor: default;
+  pointer-events: none;
+}
+.btn svg { width: 1.05em; height: 1.05em; flex-shrink: 0; }
+
+/* Variants */
+.btn--primary {
   background: var(--mauve);
   color: var(--rosewater);
-  border: 1px solid var(--mauve);
-  border-radius: 1px;
-  letter-spacing: 0.02em;
-  text-decoration: none;
-  cursor: pointer;
-  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
+  border-color: var(--mauve);
   box-shadow: 0 4px 0 -2px color-mix(in srgb, var(--mauve) 60%, black);
 }
-.btn-stamp:hover {
+.btn--primary:hover {
   transform: translateY(-1px);
   background: var(--red);
   border-color: var(--red);
   box-shadow: 0 6px 0 -2px color-mix(in srgb, var(--red) 60%, black);
 }
-.btn-stamp:active {
+.btn--primary:active {
   transform: translateY(1px);
   box-shadow: 0 1px 0 -1px color-mix(in srgb, var(--mauve) 60%, black);
 }
-.btn-ghost {
-  display: inline-flex;
-  align-items: center;
-  gap: 0.5rem;
-  font-family: var(--font-sans);
-  font-size: 0.82rem;
-  padding: 0.4rem 0.85rem;
-  background: transparent;
+.btn--ghost {
   color: var(--subtext1);
-  border: 1px solid var(--surface2);
-  border-radius: 1px;
-  letter-spacing: 0.06em;
-  text-transform: uppercase;
-  text-decoration: none;
-  cursor: pointer;
-  transition: color 0.15s, border-color 0.15s, background 0.15s;
+  border-color: var(--surface2);
+  background: color-mix(in srgb, var(--surface0) 45%, transparent);
 }
-.btn-ghost:hover {
+.btn--ghost:hover {
   color: var(--mauve);
-  border-color: var(--mauve);
-  background: color-mix(in srgb, var(--mauve) 8%, transparent);
+  border-color: color-mix(in srgb, var(--mauve) 50%, var(--surface2));
+  background: color-mix(in srgb, var(--surface0) 80%, transparent);
 }
+.btn--danger {
+  color: var(--red);
+  border-color: color-mix(in srgb, var(--red) 40%, var(--surface2));
+  background: color-mix(in srgb, var(--surface0) 45%, transparent);
+}
+.btn--danger:hover {
+  color: var(--rosewater);
+  background: var(--red);
+  border-color: var(--red);
+}
+/* Pressed/selected state for toggle & tab buttons */
+.btn.is-active {
+  color: var(--mauve);
+  border-color: color-mix(in srgb, var(--mauve) 55%, var(--surface2));
+  background: color-mix(in srgb, var(--mauve) 14%, transparent);
+}
+
+/* Sizes */
+.btn--sm { height: 2rem; padding: 0 0.85rem; font-size: 0.85rem; gap: 0.35rem; }
+.btn--lg { height: 3rem; padding: 0 1.6rem; font-size: 1.05rem; }
+
+/* Shapes */
+.btn--icon { padding: 0; width: 2.5rem; }
+.btn--icon.btn--sm { width: 2rem; }
+.btn--block { width: 100%; }
 
 /* ───── Top-bar controls — one height, one language ───── */
 .topbar-control {