diff --git a/agent.md b/agent.md
index 37c4d76..432f31c 100644
--- a/agent.md
+++ b/agent.md
@@ -37,6 +37,7 @@ This project replaces the Excel/VBA workflow named `Catalog maker - 20` with a N
 - Prefer Tailwind utility classes and Tailwind-style component patterns for buttons, panels, dialogs and responsive layouts.
 - Whenever a reusable pattern appears, prefer Tailwind component patterns (`@layer components` with `@apply`) over handwritten legacy CSS; keep one-off layout details as utility classes where practical.
 - Whenever possible, use Tailwind UI / Tailwind Plus application components and patterns for shells, multi-column layouts, sidebars, drawers, dialogs, navigation and forms; adapt them to this project's dense catalog workflow instead of inventing a separate visual pattern.
+- Multi-column panels must use a shared collapse pattern: collapsing a panel removes its grid track, lets the adjacent workspace expand, preserves an accessible expand/collapse control, and stacks predictably on mobile.
 - Use Playwright to inspect the rendered result after every visual change at desktop and narrow viewport sizes.
 
 ## TypeScript workflow
diff --git a/public/app.js b/public/app.js
index 5211152..00da89e 100644
--- a/public/app.js
+++ b/public/app.js
@@ -50,6 +50,9 @@ const testLocalDbButton = document.querySelector("#testLocalDbButton");
 const localDbTestResult = document.querySelector("#localDbTestResult");
 const lightContrastSelect = document.querySelector("#lightContrastSelect");
 const darkContrastSelect = document.querySelector("#darkContrastSelect");
+const catalogScreen = document.querySelector(".catalog-screen");
+const secondaryPanelToggle = document.querySelector("#secondaryPanelToggle");
+const mainWorkspaceToggle = document.querySelector("#mainWorkspaceToggle");
 const nativeFetch = window.fetch.bind(window);
 window.fetch = (input, init = {}) => {
     const url = typeof input === "string" ? input : input.url;
@@ -164,6 +167,8 @@ loadProductButton.addEventListener("click", loadProductInfoForCurrentProduct);
 findSourcesButton.addEventListener("click", findSourcesForCurrentProduct);
 getPicturesButton.addEventListener("click", getPicturesForCurrentProduct);
 parserDrawerToggle.addEventListener("click", toggleParserDrawer);
+secondaryPanelToggle.addEventListener("click", toggleSecondaryPanel);
+mainWorkspaceToggle.addEventListener("click", toggleMainWorkspace);
 sidebarOpenButton.addEventListener("click", openSidebar);
 sidebarCloseButton.addEventListener("click", closeSidebar);
 sidebarOverlay.addEventListener("click", closeSidebar);
@@ -855,6 +860,7 @@ function openSidebar() {
     sidebarOpenButton.hidden = true;
     sidebarOpenButton.setAttribute("aria-expanded", "true");
     sidebarDrawer.setAttribute("aria-hidden", "false");
+    catalogScreen.classList.remove("sidebar-collapsed");
 }
 function closeSidebar() {
     sidebarDrawer.classList.remove("is-open");
@@ -862,6 +868,21 @@ function closeSidebar() {
     sidebarOpenButton.hidden = false;
     sidebarOpenButton.setAttribute("aria-expanded", "false");
     sidebarDrawer.setAttribute("aria-hidden", "true");
+    catalogScreen.classList.add("sidebar-collapsed");
+}
+function toggleSecondaryPanel() {
+    const isCollapsed = catalogScreen.classList.toggle("secondary-collapsed");
+    secondaryPanelToggle.setAttribute("aria-expanded", String(!isCollapsed));
+    secondaryPanelToggle.setAttribute("aria-label", isCollapsed ? "Expand product details" : "Collapse product details");
+    secondaryPanelToggle.title = isCollapsed ? "Expand product details" : "Collapse product details";
+    secondaryPanelToggle.textContent = isCollapsed ? "›" : "‹";
+}
+function toggleMainWorkspace() {
+    const isCollapsed = catalogScreen.classList.toggle("workspace-collapsed");
+    mainWorkspaceToggle.setAttribute("aria-expanded", String(!isCollapsed));
+    mainWorkspaceToggle.setAttribute("aria-label", isCollapsed ? "Expand main workspace" : "Collapse main workspace");
+    mainWorkspaceToggle.title = isCollapsed ? "Expand main workspace" : "Collapse main workspace";
+    mainWorkspaceToggle.textContent = isCollapsed ? "‹" : "›";
 }
 function loadTheme() {
     const isDark = localStorage.getItem("catalog-maker:theme") === "dark";
diff --git a/public/app.ts b/public/app.ts
index 7daebc7..f0391a7 100644
--- a/public/app.ts
+++ b/public/app.ts
@@ -50,6 +50,9 @@ const testLocalDbButton = document.querySelector("#testLocalDbButton");
 const localDbTestResult = document.querySelector("#localDbTestResult");
 const lightContrastSelect = document.querySelector("#lightContrastSelect");
 const darkContrastSelect = document.querySelector("#darkContrastSelect");
+const catalogScreen = document.querySelector(".catalog-screen");
+const secondaryPanelToggle = document.querySelector("#secondaryPanelToggle");
+const mainWorkspaceToggle = document.querySelector("#mainWorkspaceToggle");
 
 const nativeFetch = window.fetch.bind(window);
 window.fetch = (input, init = {}) => {
@@ -170,6 +173,8 @@ loadProductButton.addEventListener("click", loadProductInfoForCurrentProduct);
 findSourcesButton.addEventListener("click", findSourcesForCurrentProduct);
 getPicturesButton.addEventListener("click", getPicturesForCurrentProduct);
 parserDrawerToggle.addEventListener("click", toggleParserDrawer);
+secondaryPanelToggle.addEventListener("click", toggleSecondaryPanel);
+mainWorkspaceToggle.addEventListener("click", toggleMainWorkspace);
 sidebarOpenButton.addEventListener("click", openSidebar);
 sidebarCloseButton.addEventListener("click", closeSidebar);
 sidebarOverlay.addEventListener("click", closeSidebar);
@@ -942,6 +947,7 @@ function openSidebar() {
   sidebarOpenButton.hidden = true;
   sidebarOpenButton.setAttribute("aria-expanded", "true");
   sidebarDrawer.setAttribute("aria-hidden", "false");
+  catalogScreen.classList.remove("sidebar-collapsed");
 }
 
 function closeSidebar() {
@@ -950,6 +956,23 @@ function closeSidebar() {
   sidebarOpenButton.hidden = false;
   sidebarOpenButton.setAttribute("aria-expanded", "false");
   sidebarDrawer.setAttribute("aria-hidden", "true");
+  catalogScreen.classList.add("sidebar-collapsed");
+}
+
+function toggleSecondaryPanel() {
+  const isCollapsed = catalogScreen.classList.toggle("secondary-collapsed");
+  secondaryPanelToggle.setAttribute("aria-expanded", String(!isCollapsed));
+  secondaryPanelToggle.setAttribute("aria-label", isCollapsed ? "Expand product details" : "Collapse product details");
+  secondaryPanelToggle.title = isCollapsed ? "Expand product details" : "Collapse product details";
+  secondaryPanelToggle.textContent = isCollapsed ? "›" : "‹";
+}
+
+function toggleMainWorkspace() {
+  const isCollapsed = catalogScreen.classList.toggle("workspace-collapsed");
+  mainWorkspaceToggle.setAttribute("aria-expanded", String(!isCollapsed));
+  mainWorkspaceToggle.setAttribute("aria-label", isCollapsed ? "Expand main workspace" : "Collapse main workspace");
+  mainWorkspaceToggle.title = isCollapsed ? "Expand main workspace" : "Collapse main workspace";
+  mainWorkspaceToggle.textContent = isCollapsed ? "‹" : "›";
 }
 
 function loadTheme() {
diff --git a/public/index.html b/public/index.html
index e44c0e9..a58596d 100644
--- a/public/index.html
+++ b/public/index.html
@@ -97,12 +97,20 @@
       </aside>
 
       <section class="product-panel secondary-panel" aria-label="Product details">
+        <div class="column-header">
+          <span>Product details</span>
+          <button class="column-toggle" id="secondaryPanelToggle" type="button" aria-expanded="true" aria-controls="fieldGrid" aria-label="Collapse product details" title="Collapse product details">‹</button>
+        </div>
         <div class="field-grid" id="fieldGrid"></div>
       </section>
 
       <section class="data-panel main-workspace" aria-label="Catalog workspace">
+        <div class="column-header workspace-header">
+          <span>Main workspace</span>
+          <button class="column-toggle" id="mainWorkspaceToggle" type="button" aria-expanded="true" aria-controls="variantGrid" aria-label="Collapse main workspace" title="Collapse main workspace">›</button>
+        </div>
         <div class="table-wrap">
-          <div class="variant-grid" role="table" aria-label="Product combinations">
+          <div class="variant-grid" id="variantGrid" role="table" aria-label="Product combinations">
             <div class="variant-header" id="variantHeader" role="row"></div>
             <div class="variant-rows" id="variantRows" role="rowgroup">
               <div class="empty-row" id="emptyTableMessage" role="row">Select manufacturer to load data.</div>
diff --git a/public/styles.css b/public/styles.css
index e372360..ffe22ef 100644
--- a/public/styles.css
+++ b/public/styles.css
@@ -1,2 +1,2 @@
 /*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */
-@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-shadow:0 0 #0000;--tw-shadow-color:initial;--tw-shadow-alpha:100%;--tw-inset-shadow:0 0 #0000;--tw-inset-shadow-color:initial;--tw-inset-shadow-alpha:100%;--tw-ring-color:initial;--tw-ring-shadow:0 0 #0000;--tw-inset-ring-color:initial;--tw-inset-ring-shadow:0 0 #0000;--tw-ring-inset:initial;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-offset-shadow:0 0 #0000;--tw-duration:initial;--tw-ease:initial;--tw-border-style:solid;--tw-font-weight:initial;--tw-tracking:initial;--tw-translate-x:0;--tw-translate-y:0;--tw-translate-z:0;--tw-leading:initial}}}@layer theme{:root,:host{--font-sans:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--color-red-100:oklch(93.6% .032 17.717);--color-red-600:oklch(57.7% .245 27.325);--color-red-700:oklch(50.5% .213 27.518);--color-lime-700:oklch(53.2% .157 131.589);--color-emerald-100:oklch(95% .052 163.051);--color-emerald-700:oklch(50.8% .118 165.612);--color-teal-50:oklch(98.4% .014 180.72);--color-slate-50:oklch(98.4% .003 247.858);--color-slate-100:oklch(96.8% .007 247.896);--color-slate-200:oklch(92.9% .013 255.508);--color-slate-300:oklch(86.9% .022 252.894);--color-slate-400:oklch(70.4% .04 256.788);--color-slate-500:oklch(55.4% .046 257.417);--color-slate-600:oklch(44.6% .043 257.281);--color-slate-700:oklch(37.2% .044 257.287);--color-slate-800:oklch(27.9% .041 260.031);--color-slate-900:oklch(20.8% .042 265.755);--color-slate-950:oklch(12.9% .042 264.695);--color-white:#fff;--spacing:.25rem;--container-md:28rem;--container-2xl:42rem;--container-3xl:48rem;--text-xs:.75rem;--text-xs--line-height:calc(1 / .75);--text-sm:.875rem;--text-sm--line-height:calc(1.25 / .875);--text-lg:1.125rem;--text-lg--line-height:calc(1.75 / 1.125);--text-xl:1.25rem;--text-xl--line-height:calc(1.75 / 1.25);--font-weight-normal:400;--font-weight-medium:500;--font-weight-semibold:600;--font-weight-bold:700;--tracking-wide:.025em;--leading-tight:1.25;--radius-lg:.5rem;--ease-out:cubic-bezier(0, 0, .2, 1);--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono);--color-catalog-surface:#f4f6f8;--color-catalog-panel-soft:#2d333b;--color-catalog-accent:#7ee34d;--color-catalog-accent-text:#10220b;--color-catalog-focus:#2f6fed}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}*,:before,:after{box-sizing:border-box}html{color-scheme:light}html.dark{color-scheme:dark}body{min-height:100vh;font-family:var(--font-sans);color:#15181c;background:var(--color-catalog-surface);margin:0}button,input,select{font:inherit}}@layer components{.catalog-screen{background-color:var(--color-catalog-surface);min-height:100vh;padding-left:calc(var(--spacing) * 72);grid-template-columns:minmax(240px,292px) minmax(0,1fr);display:grid;position:relative}.sidebar-drawer{z-index:40;min-height:100vh;width:calc(var(--spacing) * 72);gap:calc(var(--spacing) * 1.5);background-color:var(--color-slate-900);padding:calc(var(--spacing) * 1.5);color:var(--color-slate-200);--tw-shadow:0 20px 25px -5px var(--tw-shadow-color,#0000001a), 0 8px 10px -6px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow);transition-property:transform,translate,scale,rotate;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration));--tw-duration:.2s;--tw-ease:var(--ease-out);transition-duration:.2s;transition-timing-function:var(--ease-out);inset-block:0;flex-direction:column;font-size:11px;display:flex;position:fixed;left:0;overflow-y:auto}.sidebar-drawer-header{border-bottom-style:var(--tw-border-style);border-bottom-width:1px;border-color:var(--color-slate-700);padding-bottom:var(--spacing);justify-content:space-between;align-items:center;display:flex}.sidebar-drawer-title{padding-inline:var(--spacing);--tw-font-weight:var(--font-weight-semibold);font-size:10px;font-weight:var(--font-weight-semibold);--tw-tracking:var(--tracking-wide);letter-spacing:var(--tracking-wide);color:var(--color-slate-400);text-transform:uppercase}.sidebar-close-button,.sidebar-open-button{height:calc(var(--spacing) * 7);width:calc(var(--spacing) * 7);border-style:var(--tw-border-style);border-width:1px;border-color:var(--color-slate-700);background-color:var(--color-slate-800);color:var(--color-slate-200);--tw-shadow:0 1px 3px 0 var(--tw-shadow-color,#0000001a), 0 1px 2px -1px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow);transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration));border-radius:.25rem;justify-content:center;align-items:center;display:inline-flex}@media (hover:hover){:is(.sidebar-close-button,.sidebar-open-button):hover{border-color:var(--color-slate-500);background-color:var(--color-slate-700)}}.sidebar-close-button .sidebar-icon,.sidebar-open-button .sidebar-icon{height:calc(var(--spacing) * 4);width:calc(var(--spacing) * 4)}.sidebar-open-button{top:calc(var(--spacing) * 2);left:calc(var(--spacing) * 2);z-index:30;position:fixed}.sidebar-overlay{z-index:30;background-color:#02061880;position:fixed;inset:0}@supports (color:color-mix(in lab, red, red)){.sidebar-overlay{background-color:color-mix(in oklab, var(--color-slate-950) 50%, transparent)}}.sidebar-overlay[hidden]{display:none}.sidebar-drawer[aria-hidden=true]{--tw-translate-x:-100%;translate:var(--tw-translate-x) var(--tw-translate-y)}.sidebar-section{border-top-style:var(--tw-border-style);border-top-width:1px;border-color:var(--color-slate-700);padding-top:var(--spacing)}.drawer-trigger{min-height:calc(var(--spacing) * 8);align-items:center;gap:calc(var(--spacing) * 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.drawer-chevron{font-size:var(--text-sm);line-height:var(--tw-leading,var(--text-sm--line-height));color:var(--color-slate-400);margin-left:auto}.parser-drawer[hidden]{display:none}.sidebar-icon{height:calc(var(--spacing) * 4);width:calc(var(--spacing) * 4);font-size:var(--text-sm);line-height:var(--tw-leading,var(--text-sm--line-height));--tw-leading:1;color:var(--color-slate-300);flex-shrink:0;justify-content:center;align-items:center;line-height:1;display:inline-flex}.action-button{justify-content:center;align-items:center;gap:calc(var(--spacing) * 1.5);display:flex}.action-button .sidebar-icon{color:var(--color-slate-400)}.sidebar-footer{gap:var(--spacing);border-top-style:var(--tw-border-style);border-top-width:1px;border-color:var(--color-slate-700);padding-top:calc(var(--spacing) * 2);margin-top:auto;display:grid}.app-status{border-style:var(--tw-border-style);border-width:1px;border-color:var(--color-slate-700);background-color:var(--color-slate-950);padding:var(--spacing);--tw-leading:var(--leading-tight);font-size:10px;line-height:var(--leading-tight);color:var(--color-slate-100);border-radius:.25rem}.safe-mode,#modePill{background-color:var(--color-slate-100);padding-inline:var(--spacing);padding-block:calc(var(--spacing) * .5);--tw-font-weight:var(--font-weight-semibold);font-size:10px;font-weight:var(--font-weight-semibold);color:var(--color-slate-800);border-radius:.25rem;display:inline-block}#databaseStatus.database-error{background-color:var(--color-red-100);color:var(--color-red-700)}.record-id{height:calc(var(--spacing) * 10);border-style:var(--tw-border-style);border-width:1px;border-color:var(--color-lime-700);background-color:var(--color-catalog-accent);--tw-leading:1;--tw-font-weight:var(--font-weight-bold);font-size:26px;line-height:1;font-weight:var(--font-weight-bold);color:var(--color-catalog-accent-text);border-radius:.25rem;justify-content:center;align-items:center;display:flex}.arrow-row{gap:var(--spacing);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.arrow-button,.action-button,.input-like{border-style:var(--tw-border-style);border-width:1px;border-color:var(--color-slate-700);background-color:var(--color-slate-800);text-align:center;width:100%;color:var(--color-slate-200);--tw-shadow:0 1px 3px 0 var(--tw-shadow-color,#0000001a), 0 1px 2px -1px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), 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(max-width:980px){.catalog-screen{flex-direction:column;padding-left:0;display:flex}.sidebar-drawer{width:min(18rem,100vw - 1rem);min-height:0}.sidebar-drawer:not([aria-hidden=true]){max-height:100vh}.sidebar-drawer[aria-hidden=true]{--tw-translate-x:-100%;translate:var(--tw-translate-x) var(--tw-translate-y)}.sidebar-open-button{top:calc(var(--spacing) * 2);left:calc(var(--spacing) * 2)}.secondary-panel{border-right-style:var(--tw-border-style);border-right-width:0;order:1;padding-top:0}.main-workspace{order:2}.table-wrap{max-height:70vh}.column-header{height:calc(var(--spacing) * 7);writing-mode:horizontal-tb}.secondary-collapsed .secondary-panel .column-header,.workspace-collapsed .main-workspace .workspace-header{height:calc(var(--spacing) * 7);writing-mode:horizontal-tb;flex-direction:row;padding-block:0}.secondary-collapsed .secondary-panel .column-header span,.workspace-collapsed .main-workspace .workspace-header span{display:inline}.workspace-collapsed .main-workspace .table-wrap{display:none}.variant-grid{min-width:0}.variant-header{display:none}.variant-row{column-gap:calc(var(--spacing) * 2);border-bottom-style:var(--tw-border-style);border-bottom-width:1px;border-color:var(--color-slate-300);padding:calc(var(--spacing) * 2);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.variant-cell{min-height:calc(var(--spacing) * 7);justify-content:space-between;align-items:center;gap:calc(var(--spacing) * 2);border-bottom-style:var(--tw-border-style);border-bottom-width:1px;border-color:var(--color-slate-200);padding-inline:var(--spacing);padding-block:var(--spacing);text-align:right;white-space:normal;display:flex}.variant-cell:before{content:attr(data-label);text-align:left;--tw-font-weight:var(--font-weight-medium);font-size:10px;font-weight:var(--font-weight-medium);color:var(--color-slate-500);flex-shrink:0}.variant-cell[data-label=""]:before{content:none}.variant-cell[data-label=""]{grid-column:span 2/span 2}.variant-message-row{display:block}html.dark .variant-row,html.dark .variant-cell{border-color:var(--color-slate-700)}}@media (min-width:981px){.sidebar-overlay{display:none}}html:not(.dark) .control-panel{background-color:var(--color-slate-100);color:var(--color-slate-700)}html:not(.dark) .sidebar-drawer-header,html:not(.dark) .sidebar-footer{border-color:var(--color-slate-300)}html:not(.dark) .sidebar-drawer-title{color:var(--color-slate-500)}html:not(.dark) .sidebar-close-button,html:not(.dark) .sidebar-open-button,html:not(.dark) .drawer-trigger,html:not(.dark) .arrow-button,html:not(.dark) .action-button,html:not(.dark) .input-like{border-color:var(--color-slate-300);background-color:var(--color-white);color:var(--color-slate-700)}html:not(.dark) .sidebar-close-button:hover,html:not(.dark) .sidebar-open-button:hover,html:not(.dark) .drawer-trigger:hover,html:not(.dark) .arrow-button:hover:not(:disabled),html:not(.dark) .action-button:hover:not(:disabled){border-color:var(--color-slate-400);background-color:var(--color-slate-200);color:var(--color-slate-900)}html:not(.dark) .arrow-button:before{color:var(--color-slate-700)}html:not(.dark) #scanInput{background-color:var(--color-slate-200)}html:not(.dark) #scanInput::placeholder{color:var(--color-slate-500)}html:not(.dark) .picture-slot,html:not(.dark) .mapping-box{border-color:var(--color-slate-300);background-color:var(--color-white);color:var(--color-slate-600)}html:not(.dark) .mapping-toggle:before{color:var(--color-slate-700)}html:not(.dark) .app-status,html:not(.dark) .manufacturer-trigger{border-color:var(--color-slate-300);background-color:var(--color-white);color:var(--color-slate-700)}html:not(.dark) .manufacturer-trigger:hover{border-color:var(--color-slate-400);background-color:var(--color-slate-200)}html:not(.dark) .column-header{border-color:var(--color-slate-300);color:var(--color-slate-600)}html.contrast-light-high:not(.dark) .control-panel{background-color:var(--color-slate-200);color:var(--color-slate-900)}html.contrast-light-high:not(.dark) .action-button,html.contrast-light-high:not(.dark) .arrow-button,html.contrast-light-high:not(.dark) .input-like,html.contrast-light-high:not(.dark) .manufacturer-trigger{border-color:var(--color-slate-500);color:var(--color-slate-900)}html.contrast-light-high:not(.dark) .sidebar-icon{color:var(--color-slate-700)}html.dark body{background-color:var(--color-slate-950);color:var(--color-slate-100)}html.dark .control-panel{background-color:var(--color-slate-950)}html.dark .secondary-panel{border-color:var(--color-slate-700);background-color:var(--color-slate-800)}html.dark .data-panel{background-color:var(--color-slate-950)}html.dark .field-label{border-color:var(--color-slate-700);background-color:var(--color-slate-800);color:var(--color-slate-200)}html.dark .field-value{border-color:var(--color-slate-700);background-color:var(--color-slate-900);color:var(--color-slate-100)}html.dark .variant-header-cell{border-color:var(--color-slate-700);background-color:var(--color-slate-800);color:var(--color-slate-100)}html.dark .variant-row{border-color:var(--color-slate-700)}html.dark .variant-row:nth-child(2n){background-color:var(--color-slate-800)}html.dark .variant-row:hover{background-color:var(--color-slate-700)}html.dark .variant-cell{border-color:var(--color-slate-700);color:var(--color-slate-200)}html.dark .arrow-button,html.dark .action-button,html.dark .input-like{border-color:var(--color-slate-600);background-color:var(--color-slate-800);color:var(--color-slate-100)}html.dark .arrow-button:hover:not(:disabled),html.dark .action-button:hover:not(:disabled){border-color:var(--color-slate-400);background-color:var(--color-slate-700)}html.dark #scanInput{background-color:var(--color-slate-700)}html.dark #scanInput::placeholder{color:var(--color-slate-400)}html.dark .manufacturer-menu{border-color:var(--color-slate-700);background-color:var(--color-slate-900)}html.dark .manufacturer-search{border-color:var(--color-slate-600);background-color:var(--color-slate-800);color:var(--color-slate-100)}html.dark .manufacturer-option{color:var(--color-slate-200)}@media (hover:hover){html.dark .manufacturer-option:hover{background-color:var(--color-slate-800)}}html.dark .manufacturer-option[aria-selected=true]{background-color:var(--color-slate-700);color:var(--color-white)}html.dark .column-header{border-color:var(--color-slate-700);color:var(--color-slate-300)}html.contrast-dark-high.dark .control-panel{background-color:var(--color-slate-950);color:var(--color-white)}html.contrast-dark-high.dark .action-button,html.contrast-dark-high.dark .arrow-button,html.contrast-dark-high.dark .input-like,html.contrast-dark-high.dark .manufacturer-trigger{border-color:var(--color-slate-500);background-color:var(--color-slate-700);color:var(--color-white)}html.contrast-dark-high.dark .sidebar-icon{color:var(--color-slate-100)}html.dark .settings-dialog,html.dark .suggested-dialog,html.dark .source-dialog{border-color:var(--color-slate-700);background-color:var(--color-slate-900)}html.dark .suggested-header{border-color:var(--color-slate-700);background-color:var(--color-slate-800)}html.dark .suggested-header h2,html.dark .settings-group legend,html.dark .settings-option,html.dark .settings-field{color:var(--color-slate-100)}html.dark .settings-group{border-color:var(--color-slate-700)}html.dark .settings-field input,html.dark .modal-close,html.dark .settings-test-button,html.dark .suggested-pick,html.dark .source-row-action,html.dark .source-picture-action{border-color:var(--color-slate-600);background-color:var(--color-slate-800);color:var(--color-slate-100)}@media (hover:hover){:is(html.dark .modal-close,html.dark .settings-test-button,html.dark .suggested-pick,html.dark .source-row-action,html.dark .source-picture-action):hover{background-color:var(--color-slate-700)}}html.dark .source-section{border-color:var(--color-slate-700)}html.dark .source-section-header{border-color:var(--color-slate-700);background-color:var(--color-slate-800);color:var(--color-slate-100)}html.dark .source-row{border-color:var(--color-slate-700);background-color:var(--color-slate-900);color:var(--color-slate-100)}@media (hover:hover){html.dark .source-row:hover{background-color:var(--color-slate-800)}}html.dark .suggested-row,html.dark .picture-candidate{border-color:var(--color-slate-700)}html.dark .suggested-row:nth-child(2n){background-color:var(--color-slate-800)}}@layer utilities{.collapse{visibility:collapse}.visible{visibility:visible}.contents{display:contents}.grid{display:grid}.hidden{display:none}.table{display:table}}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-duration{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@property --tw-leading{syntax:"*";inherits:false}
\ No newline at end of file
diff --git a/src/tailwind.css b/src/tailwind.css
index 0e65b2d..0de938a 100644
--- a/src/tailwind.css
+++ b/src/tailwind.css
@@ -41,7 +41,10 @@
 }
 
 @layer components {
-  .catalog-screen { @apply relative grid min-h-screen grid-cols-[minmax(240px,292px)_minmax(0,1fr)] bg-catalog-surface pl-72; }
+  .catalog-screen { @apply relative grid min-h-screen bg-catalog-surface pl-72; --secondary-track: minmax(240px,292px); --workspace-track: minmax(0,1fr); grid-template-columns: var(--secondary-track) var(--workspace-track); }
+  .catalog-screen.sidebar-collapsed { @apply pl-0; }
+  .catalog-screen.secondary-collapsed { --secondary-track: 44px; }
+  .catalog-screen.workspace-collapsed { --workspace-track: 44px; }
   .sidebar-drawer { @apply fixed inset-y-0 left-0 z-40 flex w-72 min-h-screen flex-col gap-1.5 overflow-y-auto bg-slate-900 p-1.5 text-[11px] text-slate-200 shadow-xl transition-transform duration-200 ease-out; }
   .sidebar-drawer-header { @apply flex items-center justify-between border-b border-slate-700 pb-1; }
   .sidebar-drawer-title { @apply px-1 text-[10px] font-semibold uppercase tracking-wide text-slate-400; }
@@ -110,7 +113,15 @@
   .mapping-source-status.is-ok { @apply bg-emerald-100 text-emerald-700; }
   .mapping-source-status.is-bad { @apply bg-red-100 text-red-700; }
   .mapping-source-status.is-muted { @apply bg-slate-200 text-slate-600; }
-  .secondary-panel { @apply min-w-0 border-r border-slate-400 bg-slate-300 pt-[22px]; }
+  .secondary-panel { @apply min-w-0 border-r border-slate-400 bg-slate-300; }
+  .column-header { @apply flex h-7 items-center justify-between gap-1 border-b border-slate-400 px-1 text-[10px] font-semibold uppercase tracking-wide text-slate-600; }
+  .column-toggle { @apply inline-flex h-5 w-5 items-center justify-center rounded border border-slate-400 bg-white text-sm leading-none text-slate-700 hover:bg-slate-200; }
+  .secondary-panel .field-grid { @apply overflow-hidden; }
+  .secondary-collapsed .secondary-panel .column-header { @apply h-full flex-col justify-start py-1; writing-mode: vertical-rl; }
+  .secondary-collapsed .secondary-panel .field-grid { display: none; }
+  .workspace-collapsed .main-workspace .workspace-header { @apply h-full flex-col justify-start py-1; writing-mode: vertical-rl; }
+  .workspace-collapsed .main-workspace .workspace-header span,
+  .workspace-collapsed .main-workspace .table-wrap { display: none; }
   .field-grid { @apply grid grid-cols-[132px_minmax(0,168px)] content-start; }
   .field-label, .field-value { @apply min-h-[22px] border-b border-slate-300 px-1 py-0.5 text-[11px] leading-tight; }
   .field-label { @apply bg-slate-200 text-slate-800; }
@@ -183,6 +194,12 @@
     .secondary-panel { @apply order-1; }
     .main-workspace { @apply order-2; }
     .table-wrap { @apply max-h-[70vh]; }
+    .column-header { @apply h-7; writing-mode: horizontal-tb; }
+    .secondary-collapsed .secondary-panel .column-header,
+    .workspace-collapsed .main-workspace .workspace-header { @apply h-7 flex-row py-0; writing-mode: horizontal-tb; }
+    .secondary-collapsed .secondary-panel .column-header span,
+    .workspace-collapsed .main-workspace .workspace-header span { display: inline; }
+    .workspace-collapsed .main-workspace .table-wrap { display: none; }
     .variant-grid { @apply min-w-0; }
     .variant-header { @apply hidden; }
     .variant-row { @apply grid grid-cols-2 gap-x-2 border-b border-slate-300 p-2; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@@ -222,6 +239,7 @@
   html:not(.dark) .app-status { @apply border-slate-300 bg-white text-slate-700; }
   html:not(.dark) .manufacturer-trigger { @apply border-slate-300 bg-white text-slate-700; }
   html:not(.dark) .manufacturer-trigger:hover { @apply border-slate-400 bg-slate-200; }
+  html:not(.dark) .column-header { @apply border-slate-300 text-slate-600; }
   html.contrast-light-high:not(.dark) .control-panel { @apply bg-slate-200 text-slate-900; }
   html.contrast-light-high:not(.dark) .action-button,
   html.contrast-light-high:not(.dark) .arrow-button,
@@ -250,6 +268,7 @@
   html.dark .manufacturer-search { @apply border-slate-600 bg-slate-800 text-slate-100; }
   html.dark .manufacturer-option { @apply text-slate-200 hover:bg-slate-800; }
   html.dark .manufacturer-option[aria-selected="true"] { @apply bg-slate-700 text-white; }
+  html.dark .column-header { @apply border-slate-700 text-slate-300; }
   html.contrast-dark-high.dark .control-panel { @apply bg-slate-950 text-white; }
   html.contrast-dark-high.dark .action-button,
   html.contrast-dark-high.dark .arrow-button,
diff --git a/tests/ui/catalog-maker.smoke.spec.ts b/tests/ui/catalog-maker.smoke.spec.ts
index 2b0cf84..04a45cd 100644
--- a/tests/ui/catalog-maker.smoke.spec.ts
+++ b/tests/ui/catalog-maker.smoke.spec.ts
@@ -57,6 +57,22 @@ test("left controls open in a responsive sidebar drawer", async ({ page }) => {
   await expect(page.locator("#sidebarOverlay")).toBeHidden();
 });
 
+test("workspace columns collapse and expand without leaving a gap", async ({ page }) => {
+  await page.goto("/");
+  await page.locator("#sidebarCloseButton").click();
+  await expect(page.locator(".catalog-screen")).toHaveClass(/sidebar-collapsed/);
+
+  await page.locator("#secondaryPanelToggle").click();
+  await expect(page.locator(".catalog-screen")).toHaveClass(/secondary-collapsed/);
+  await page.locator("#mainWorkspaceToggle").click();
+  await expect(page.locator(".catalog-screen")).toHaveClass(/workspace-collapsed/);
+
+  await page.locator("#secondaryPanelToggle").click();
+  await page.locator("#mainWorkspaceToggle").click();
+  await expect(page.locator(".catalog-screen")).not.toHaveClass(/secondary-collapsed/);
+  await expect(page.locator(".catalog-screen")).not.toHaveClass(/workspace-collapsed/);
+});
+
 test("theme toggle switches and persists dark mode", async ({ page }) => {
   await page.goto("/");
   await page.evaluate(() => localStorage.clear());