diff --git a/src/App.tsx b/src/App.tsx
index c7f0f55..7c81359 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -623,44 +623,40 @@ export default function App() {
 
   return (
     <main className="app-shell">
-      <section className="hero">
+      <header className="topbar">
         <div>
-          <p className="eyebrow">Static browser CORS diagnostics</p>
+          <p className="eyebrow">Browser CORS tester</p>
           <h1>CORS Test Lab</h1>
-          <p className="hero-copy">
-            Test real browser CORS behavior from this page origin, classify preflights, inspect readable responses,
-            and generate reports for API owners.
-          </p>
         </div>
-        <div className="origin-panel">
-          <span>Testing origin</span>
+        <div className="origin-badge">
+          <span>Actual origin</span>
           <strong>{getOriginLabel()}</strong>
         </div>
-      </section>
+      </header>
 
-      <section className="dashboard">
-        <div className="request-panel">
-          <div className="section-heading">
-            <div>
-              <p className="eyebrow">Request builder</p>
-              <h2>Configure a test</h2>
-            </div>
-            <button className="primary" disabled={isRunning} onClick={() => void runTest()}>
+      <section className="workspace">
+        <div className="tester-card">
+          <div className="card-heading">
+            <h2>Test an API endpoint</h2>
+            <p>Run a real browser request from the origin shown above. The app cannot spoof the Origin header.</p>
+          </div>
+
+          <div className="url-row">
+            <label className="field">
+              <span>API URL</span>
+              <input
+                value={draft.url}
+                onChange={(event) => patchDraft({ url: event.target.value })}
+                placeholder="https://api.example.com/v1/resource"
+                inputMode="url"
+              />
+            </label>
+            <button className="primary run-button" disabled={isRunning} onClick={() => void runTest()}>
               {isRunning ? 'Running...' : 'Run test'}
             </button>
           </div>
 
-          <label className="field field-full">
-            <span>API URL</span>
-            <input
-              value={draft.url}
-              onChange={(event) => patchDraft({ url: event.target.value })}
-              placeholder="https://api.example.com/v1/resource"
-              inputMode="url"
-            />
-          </label>
-
-          <div className="control-grid">
+          <div className="request-grid">
             <label className="field">
               <span>Method</span>
               <select value={draft.method} onChange={(event) => patchDraft({ method: event.target.value as HttpMethod })}>
@@ -706,7 +702,7 @@ export default function App() {
             </label>
           </div>
 
-          <div className="status-strip">
+          <div className="summary-strip">
             <span className={preflightExpected ? 'pill warning' : 'pill ok'}>
               {preflightExpected ? 'Preflight expected' : 'Simple request shape'}
             </span>
@@ -714,165 +710,165 @@ export default function App() {
             <span className="pill">Credentials: {draft.credentials}</span>
           </div>
 
-          <div className="section-subhead">
-            <h3>Headers</h3>
-            <button className="ghost" onClick={() => patchDraft({ headers: [...draft.headers, emptyHeader()] })}>
-              Add header
-            </button>
-          </div>
-          <div className="headers-list">
-            {draft.headers.map((header) => (
-              <div className="header-row" key={header.id}>
-                <input
-                  value={header.name}
-                  onChange={(event) => updateHeader(header.id, 'name', event.target.value)}
-                  placeholder="Header name"
-                />
-                <input
-                  value={header.value}
-                  onChange={(event) => updateHeader(header.id, 'value', event.target.value)}
-                  placeholder="Value"
-                />
-                <button className="icon-button" aria-label="Remove header" onClick={() => removeHeader(header.id)}>
-                  x
-                </button>
-              </div>
-            ))}
-          </div>
-
-          <div className="control-grid body-grid">
-            <label className="field">
-              <span>Content type</span>
-              <select value={draft.contentType} onChange={(event) => patchDraft({ contentType: event.target.value })}>
-                {CONTENT_TYPES.map((contentType) => (
-                  <option key={contentType.value} value={contentType.value}>
-                    {contentType.label}
-                  </option>
-                ))}
-              </select>
-            </label>
-            <label className="field field-body">
-              <span>Body</span>
-              <textarea
-                value={draft.body}
-                onChange={(event) => patchDraft({ body: event.target.value })}
-                placeholder='{"example": true}'
-                spellCheck={false}
-              />
-            </label>
-          </div>
-        </div>
-
-        <aside className="side-panel">
-          <div className="section-heading compact">
+          <div className="quick-probes">
             <div>
-              <p className="eyebrow">Scenarios</p>
-              <h2>One-click probes</h2>
+              <h3>Quick probes</h3>
+              <p>Use the same URL with common CORS shapes.</p>
+            </div>
+            <div className="probe-list">
+              {scenarios.map((scenario) => (
+                <button
+                  className="probe-chip"
+                  key={scenario.id}
+                  disabled={isRunning}
+                  onClick={() => void runTest(scenario.overrides, scenario.title)}
+                  title={scenario.description}
+                >
+                  {scenario.title}
+                </button>
+              ))}
             </div>
-          </div>
-          <div className="scenario-grid">
-            {scenarios.map((scenario) => (
-              <button
-                className="scenario-card"
-                key={scenario.id}
-                disabled={isRunning}
-                onClick={() => void runTest(scenario.overrides, scenario.title)}
-              >
-                <strong>{scenario.title}</strong>
-                <span>{scenario.description}</span>
-              </button>
-            ))}
           </div>
 
-          <div className="policy-panel">
-            <div className="section-heading compact">
-              <div>
-                <p className="eyebrow">Domain policy</p>
-                <h2>Expected origins</h2>
-              </div>
-            </div>
-            <div className="policy-origin">
-              <span>Actual browser origin</span>
-              <strong>{getOriginLabel()}</strong>
-            </div>
-            <p className="policy-note">
-              This static page cannot spoof Origin. Use these lists to record expected allow/block rules; this run
-              only proves behavior for the actual browser origin above.
-            </p>
-            <label className="field policy-field">
-              <span>Expected allowed origins</span>
-              <textarea
-                className="origin-textarea"
-                value={originLines(draft.allowedOrigins)}
-                onChange={(event) => patchDraft({ allowedOrigins: parseOriginLines(event.target.value) })}
-                placeholder={'https://app.example.com\nhttps://admin.example.com'}
-                spellCheck={false}
-              />
-            </label>
-            <label className="field policy-field">
-              <span>Expected blocked origins</span>
-              <textarea
-                className="origin-textarea"
-                value={originLines(draft.blockedOrigins)}
-                onChange={(event) => patchDraft({ blockedOrigins: parseOriginLines(event.target.value) })}
-                placeholder={'https://unknown.example.com\nhttps://staging.example.net'}
-                spellCheck={false}
-              />
-            </label>
-          </div>
-
-          <div className="saved-panel">
-            <div className="section-subhead">
-              <h3>Saved cases</h3>
-              <div className="button-pair">
-                <button className="ghost" disabled={!savedCases.length} onClick={exportCases}>
-                  Export
-                </button>
-                <button className="ghost" onClick={() => fileInputRef.current?.click()}>
-                  Import
+          <details className="details-panel">
+            <summary>Request details</summary>
+            <div className="details-body">
+              <div className="section-subhead">
+                <h3>Headers</h3>
+                <button className="ghost" onClick={() => patchDraft({ headers: [...draft.headers, emptyHeader()] })}>
+                  Add header
                 </button>
               </div>
-            </div>
-            <input ref={fileInputRef} hidden type="file" accept="application/json" onChange={(event) => void importCases(event)} />
-            <div className="save-row">
-              <input value={caseName} onChange={(event) => setCaseName(event.target.value)} placeholder="Case name" />
-              <button className="secondary" onClick={saveCase}>
-                Save
-              </button>
-            </div>
-            <div className="saved-list">
-              {savedCases.length === 0 ? (
-                <p className="muted">No saved cases yet.</p>
-              ) : (
-                savedCases.map((saved) => (
-                  <div className="saved-item" key={saved.id}>
-                    <button onClick={() => loadCase(saved)}>
-                      <strong>{saved.name}</strong>
-                      <span>
-                        {saved.method} {saved.url || 'No URL'}
-                      </span>
-                    </button>
-                    <button
-                      className="icon-button"
-                      aria-label={`Delete ${saved.name}`}
-                      onClick={() => setSavedCases((current) => current.filter((item) => item.id !== saved.id))}
-                    >
+              <div className="headers-list">
+                {draft.headers.map((header) => (
+                  <div className="header-row" key={header.id}>
+                    <input
+                      value={header.name}
+                      onChange={(event) => updateHeader(header.id, 'name', event.target.value)}
+                      placeholder="Header name"
+                    />
+                    <input
+                      value={header.value}
+                      onChange={(event) => updateHeader(header.id, 'value', event.target.value)}
+                      placeholder="Value"
+                    />
+                    <button className="icon-button" aria-label="Remove header" onClick={() => removeHeader(header.id)}>
                       x
                     </button>
                   </div>
-                ))
-              )}
-            </div>
-          </div>
-        </aside>
-      </section>
+                ))}
+              </div>
+
+              <div className="body-grid">
+                <label className="field">
+                  <span>Content type</span>
+                  <select value={draft.contentType} onChange={(event) => patchDraft({ contentType: event.target.value })}>
+                    {CONTENT_TYPES.map((contentType) => (
+                      <option key={contentType.value} value={contentType.value}>
+                        {contentType.label}
+                      </option>
+                    ))}
+                  </select>
+                </label>
+                <label className="field field-body">
+                  <span>Body</span>
+                  <textarea
+                    value={draft.body}
+                    onChange={(event) => patchDraft({ body: event.target.value })}
+                    placeholder='{"example": true}'
+                    spellCheck={false}
+                  />
+                </label>
+              </div>
+            </div>
+          </details>
+
+          <details className="details-panel">
+            <summary>Domain policy notes</summary>
+            <div className="details-body">
+              <div className="policy-origin">
+                <span>Actual browser origin</span>
+                <strong>{getOriginLabel()}</strong>
+              </div>
+              <p className="policy-note">
+                Add expected allowed or blocked origins for your report. This is not a spoofed test; to verify another
+                domain, run this app from that domain.
+              </p>
+              <div className="policy-grid">
+                <label className="field policy-field">
+                  <span>Expected allowed origins</span>
+                  <textarea
+                    className="origin-textarea"
+                    value={originLines(draft.allowedOrigins)}
+                    onChange={(event) => patchDraft({ allowedOrigins: parseOriginLines(event.target.value) })}
+                    placeholder={'https://app.example.com\nhttps://admin.example.com'}
+                    spellCheck={false}
+                  />
+                </label>
+                <label className="field policy-field">
+                  <span>Expected blocked origins</span>
+                  <textarea
+                    className="origin-textarea"
+                    value={originLines(draft.blockedOrigins)}
+                    onChange={(event) => patchDraft({ blockedOrigins: parseOriginLines(event.target.value) })}
+                    placeholder={'https://unknown.example.com\nhttps://staging.example.net'}
+                    spellCheck={false}
+                  />
+                </label>
+              </div>
+            </div>
+          </details>
+
+          <details className="details-panel">
+            <summary>Saved cases</summary>
+            <div className="details-body">
+              <div className="save-row">
+                <input value={caseName} onChange={(event) => setCaseName(event.target.value)} placeholder="Case name" />
+                <button className="secondary" onClick={saveCase}>
+                  Save
+                </button>
+              </div>
+              <div className="saved-actions">
+                <button className="ghost" disabled={!savedCases.length} onClick={exportCases}>
+                  Export JSON
+                </button>
+                <button className="ghost" onClick={() => fileInputRef.current?.click()}>
+                  Import JSON
+                </button>
+              </div>
+              <input ref={fileInputRef} hidden type="file" accept="application/json" onChange={(event) => void importCases(event)} />
+              <div className="saved-list">
+                {savedCases.length === 0 ? (
+                  <p className="muted">No saved cases yet.</p>
+                ) : (
+                  savedCases.map((saved) => (
+                    <div className="saved-item" key={saved.id}>
+                      <button onClick={() => loadCase(saved)}>
+                        <strong>{saved.name}</strong>
+                        <span>
+                          {saved.method} {saved.url || 'No URL'}
+                        </span>
+                      </button>
+                      <button
+                        className="icon-button"
+                        aria-label={`Delete ${saved.name}`}
+                        onClick={() => setSavedCases((current) => current.filter((item) => item.id !== saved.id))}
+                      >
+                        x
+                      </button>
+                    </div>
+                  ))
+                )}
+              </div>
+            </div>
+          </details>
+        </div>
 
-      <section className="results-layout">
         <div className="result-panel">
-          <div className="section-heading">
+          <div className="card-heading result-heading">
             <div>
-              <p className="eyebrow">Latest result</p>
-              <h2>{latestResult ? latestResult.label : 'No test run yet'}</h2>
+              <h2>Result</h2>
+              <p>{latestResult ? latestResult.label : 'Run a test to see browser evidence and diagnostics.'}</p>
             </div>
             {latestResult ? (
               <button className="secondary" onClick={() => void copyReport(latestResult)}>
@@ -892,13 +888,16 @@ export default function App() {
                 <span className={`big-status ${latestResult.status}`}>{latestResult.status}</span>
                 <div>
                   <strong>{latestResult.browserResult}</strong>
-                  <span>
-                    {latestResult.durationMs}ms
-                    {latestResult.statusCode ? `, HTTP ${latestResult.statusCode} ${latestResult.statusText ?? ''}` : ''}
-                  </span>
+                  <span>{latestResult.durationMs}ms</span>
                 </div>
               </div>
 
+              <div className="result-meta">
+                <span>HTTP: {latestResult.statusCode ? `${latestResult.statusCode} ${latestResult.statusText ?? ''}` : 'not readable'}</span>
+                <span>Type: {latestResult.responseType ?? 'not available'}</span>
+                <span>Origin: {getOriginLabel()}</span>
+              </div>
+
               {latestResult.error ? <div className="alert danger">{latestResult.error}</div> : null}
               {latestResult.warnings.map((warning) => (
                 <div className="alert warning" key={warning}>
@@ -922,24 +921,19 @@ export default function App() {
               </div>
             </>
           )}
-        </div>
 
-        <div className="analysis-panel">
-          <div className="section-heading compact">
-            <div>
-              <p className="eyebrow">Analysis</p>
-              <h2>What it means</h2>
-            </div>
+          <div className="analysis-block">
+            <h3>Diagnostics</h3>
+            {latestResult ? (
+              <ul className="diagnostics-list">
+                {latestResult.diagnostics.map((diagnostic) => (
+                  <li key={diagnostic}>{diagnostic}</li>
+                ))}
+              </ul>
+            ) : (
+              <p className="muted">Diagnostics appear after a run.</p>
+            )}
           </div>
-          {latestResult ? (
-            <ul className="diagnostics-list">
-              {latestResult.diagnostics.map((diagnostic) => (
-                <li key={diagnostic}>{diagnostic}</li>
-              ))}
-            </ul>
-          ) : (
-            <p className="muted">Diagnostics appear after a run.</p>
-          )}
 
           <div className="history">
             <h3>Run history</h3>
diff --git a/src/styles.css b/src/styles.css
index f89ca0d..4c95c91 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -2,8 +2,8 @@
   color-scheme: light;
   font-family:
     Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
-  color: #172033;
-  background: #eef4f8;
+  color: #182230;
+  background: #f4f6f8;
   font-synthesis: none;
   text-rendering: optimizeLegibility;
   -webkit-font-smoothing: antialiased;
@@ -14,12 +14,10 @@
 }
 
 body {
-  margin: 0;
   min-width: 320px;
   min-height: 100vh;
-  background:
-    radial-gradient(circle at top left, rgba(37, 99, 235, 0.18), transparent 30rem),
-    linear-gradient(135deg, #f8fbff 0%, #eef4f8 44%, #e8eef5 100%);
+  margin: 0;
+  background: #f4f6f8;
 }
 
 button,
@@ -38,29 +36,6 @@ button:disabled {
   opacity: 0.55;
 }
 
-.app-shell {
-  width: min(1480px, calc(100% - 32px));
-  margin: 0 auto;
-  padding: 28px 0 48px;
-}
-
-.hero {
-  display: grid;
-  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
-  gap: 24px;
-  align-items: end;
-  margin-bottom: 24px;
-}
-
-.eyebrow {
-  margin: 0 0 8px;
-  color: #2563eb;
-  font-size: 0.78rem;
-  font-weight: 800;
-  letter-spacing: 0.08em;
-  text-transform: uppercase;
-}
-
 h1,
 h2,
 h3,
@@ -68,142 +43,162 @@ p {
   margin-top: 0;
 }
 
-h1 {
-  margin-bottom: 12px;
-  color: #0f172a;
-  font-size: clamp(2.8rem, 7vw, 6.5rem);
-  line-height: 0.95;
+.app-shell {
+  width: min(1280px, calc(100% - 32px));
+  margin: 0 auto;
+  padding: 24px 0 48px;
 }
 
-h2 {
-  margin-bottom: 0;
-  color: #111827;
-  font-size: 1.35rem;
-}
-
-h3 {
-  margin-bottom: 10px;
-  color: #1f2937;
-  font-size: 0.98rem;
-}
-
-.hero-copy {
-  max-width: 820px;
-  margin-bottom: 0;
-  color: #526173;
-  font-size: 1.08rem;
-  line-height: 1.65;
-}
-
-.origin-panel {
-  padding: 18px;
-  border: 1px solid rgba(37, 99, 235, 0.18);
-  border-radius: 8px;
-  background: rgba(255, 255, 255, 0.76);
-  box-shadow: 0 18px 50px rgba(30, 41, 59, 0.08);
-}
-
-.origin-panel span,
-.field span {
-  display: block;
-  margin-bottom: 7px;
-  color: #64748b;
-  font-size: 0.78rem;
-  font-weight: 800;
-  text-transform: uppercase;
-}
-
-.origin-panel strong {
-  display: block;
-  overflow-wrap: anywhere;
-  color: #0f172a;
-}
-
-.dashboard,
-.results-layout {
-  display: grid;
-  grid-template-columns: minmax(0, 1.45fr) minmax(360px, 0.8fr);
-  gap: 20px;
-  align-items: start;
-}
-
-.results-layout {
-  margin-top: 20px;
-}
-
-.request-panel,
-.side-panel,
-.result-panel,
-.analysis-panel {
-  border: 1px solid rgba(148, 163, 184, 0.35);
-  border-radius: 8px;
-  background: rgba(255, 255, 255, 0.86);
-  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
-}
-
-.request-panel,
-.result-panel,
-.analysis-panel {
-  padding: 22px;
-}
-
-.side-panel {
-  padding: 18px;
-}
-
-.section-heading,
-.section-subhead {
+.topbar {
   display: flex;
-  gap: 16px;
-  align-items: center;
+  gap: 20px;
+  align-items: flex-end;
   justify-content: space-between;
   margin-bottom: 18px;
 }
 
-.section-heading.compact {
-  margin-bottom: 14px;
+.eyebrow {
+  margin-bottom: 6px;
+  color: #2563eb;
+  font-size: 0.74rem;
+  font-weight: 800;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
 }
 
-.section-subhead {
-  margin: 18px 0 10px;
+h1 {
+  margin-bottom: 0;
+  color: #101828;
+  font-size: 2.25rem;
+  line-height: 1;
 }
 
-.section-subhead h3 {
-  margin: 0;
+h2 {
+  margin-bottom: 6px;
+  color: #101828;
+  font-size: 1.18rem;
+  line-height: 1.25;
+}
+
+h3 {
+  margin-bottom: 8px;
+  color: #182230;
+  font-size: 0.96rem;
+  line-height: 1.35;
+}
+
+.origin-badge {
+  max-width: 520px;
+  border: 1px solid #d0d5dd;
+  border-radius: 8px;
+  padding: 10px 12px;
+  background: #ffffff;
+}
+
+.origin-badge span,
+.field span,
+.policy-origin span {
+  display: block;
+  margin-bottom: 5px;
+  color: #667085;
+  font-size: 0.72rem;
+  font-weight: 800;
+  text-transform: uppercase;
+}
+
+.origin-badge strong,
+.policy-origin strong {
+  display: block;
+  color: #101828;
+  font-size: 0.9rem;
+  overflow-wrap: anywhere;
+}
+
+.workspace {
+  display: grid;
+  grid-template-columns: minmax(0, 0.95fr) minmax(420px, 1.05fr);
+  gap: 18px;
+  align-items: start;
+}
+
+.tester-card,
+.result-panel {
+  border: 1px solid #d0d5dd;
+  border-radius: 8px;
+  background: #ffffff;
+  box-shadow: 0 12px 30px rgba(16, 24, 40, 0.06);
+}
+
+.tester-card {
+  padding: 18px;
+}
+
+.result-panel {
+  padding: 18px;
+}
+
+.card-heading {
+  margin-bottom: 16px;
+}
+
+.card-heading p,
+.quick-probes p,
+.policy-note,
+.muted {
+  margin-bottom: 0;
+  color: #667085;
+  font-size: 0.9rem;
+  line-height: 1.55;
+}
+
+.result-heading {
+  display: flex;
+  gap: 12px;
+  align-items: flex-start;
+  justify-content: space-between;
+}
+
+.url-row {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: 10px;
+  align-items: end;
+}
+
+.request-grid {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 10px;
+  margin-top: 12px;
 }
 
 .field {
   display: block;
 }
 
-.field-full {
-  margin-bottom: 16px;
-}
-
 input,
 select,
 textarea {
   width: 100%;
-  border: 1px solid #d4dce7;
+  border: 1px solid #d0d5dd;
   border-radius: 8px;
   background: #ffffff;
-  color: #172033;
+  color: #182230;
   outline: none;
   transition:
     border-color 160ms ease,
-    box-shadow 160ms ease,
-    background 160ms ease;
+    box-shadow 160ms ease;
 }
 
 input,
 select {
   height: 42px;
-  padding: 0 12px;
+  padding: 0 11px;
 }
 
 textarea {
-  min-height: 156px;
-  padding: 12px;
+  min-height: 130px;
+  padding: 10px 11px;
   resize: vertical;
   line-height: 1.5;
 }
@@ -212,22 +207,173 @@ input:focus,
 select:focus,
 textarea:focus {
   border-color: #2563eb;
-  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.14);
+  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
 }
 
-.control-grid {
+.primary,
+.secondary,
+.ghost,
+.icon-button,
+.probe-chip {
+  min-height: 40px;
+  border-radius: 8px;
+  font-weight: 800;
+}
+
+.primary {
+  border: 1px solid #1d4ed8;
+  background: #2563eb;
+  color: #ffffff;
+}
+
+.primary:hover {
+  background: #1d4ed8;
+}
+
+.run-button {
+  min-width: 132px;
+  padding: 0 18px;
+}
+
+.secondary {
+  border: 1px solid #bfdbfe;
+  background: #eff6ff;
+  color: #1d4ed8;
+  padding: 0 13px;
+}
+
+.ghost {
+  border: 1px solid #d0d5dd;
+  background: #ffffff;
+  color: #344054;
+  padding: 0 13px;
+}
+
+.icon-button {
+  width: 42px;
+  border: 1px solid #d0d5dd;
+  background: #ffffff;
+  color: #667085;
+}
+
+.summary-strip,
+.probe-list,
+.saved-actions,
+.result-meta {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.summary-strip {
+  margin-top: 12px;
+}
+
+.pill {
+  display: inline-flex;
+  min-height: 28px;
+  align-items: center;
+  border: 1px solid #d0d5dd;
+  border-radius: 999px;
+  padding: 5px 10px;
+  background: #f9fafb;
+  color: #475467;
+  font-size: 0.8rem;
+  font-weight: 800;
+}
+
+.pill.ok {
+  border-color: #bbf7d0;
+  background: #f0fdf4;
+  color: #15803d;
+}
+
+.pill.warning {
+  border-color: #fed7aa;
+  background: #fff7ed;
+  color: #b45309;
+}
+
+.quick-probes {
   display: grid;
-  grid-template-columns: repeat(4, minmax(0, 1fr));
-  gap: 12px;
-}
-
-.body-grid {
-  grid-template-columns: minmax(180px, 0.32fr) minmax(0, 1fr);
+  gap: 10px;
   margin-top: 16px;
+  border: 1px solid #e4e7ec;
+  border-radius: 8px;
+  padding: 12px;
+  background: #f9fafb;
 }
 
-.field-body {
-  grid-row: span 2;
+.quick-probes h3 {
+  margin-bottom: 2px;
+}
+
+.probe-chip {
+  border: 1px solid #d0d5dd;
+  background: #ffffff;
+  color: #344054;
+  padding: 0 11px;
+}
+
+.probe-chip:hover,
+.ghost:hover,
+.saved-item:hover,
+.history-row:hover {
+  border-color: #98a2b3;
+  background: #f9fafb;
+}
+
+.details-panel {
+  margin-top: 12px;
+  border: 1px solid #e4e7ec;
+  border-radius: 8px;
+  background: #ffffff;
+}
+
+.details-panel summary {
+  display: flex;
+  align-items: center;
+  min-height: 46px;
+  padding: 0 13px;
+  color: #182230;
+  font-weight: 850;
+  list-style: none;
+  cursor: pointer;
+}
+
+.details-panel summary::-webkit-details-marker {
+  display: none;
+}
+
+.details-panel summary::after {
+  margin-left: auto;
+  color: #667085;
+  content: "+";
+  font-size: 1.1rem;
+}
+
+.details-panel[open] summary {
+  border-bottom: 1px solid #e4e7ec;
+}
+
+.details-panel[open] summary::after {
+  content: "-";
+}
+
+.details-body {
+  padding: 13px;
+}
+
+.section-subhead {
+  display: flex;
+  gap: 12px;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 10px;
+}
+
+.section-subhead h3 {
+  margin-bottom: 0;
 }
 
 .headers-list {
@@ -235,184 +381,56 @@ textarea:focus {
   gap: 8px;
 }
 
-.header-row,
-.save-row {
+.header-row {
   display: grid;
   grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 42px;
   gap: 8px;
 }
 
-.save-row {
-  grid-template-columns: minmax(0, 1fr) auto;
-}
-
-.status-strip {
-  display: flex;
-  flex-wrap: wrap;
-  gap: 8px;
-  margin-top: 14px;
-}
-
-.pill {
-  display: inline-flex;
-  min-height: 30px;
-  align-items: center;
-  border: 1px solid #dbe3ef;
-  border-radius: 999px;
-  padding: 6px 10px;
-  background: #f8fafc;
-  color: #475569;
-  font-size: 0.82rem;
-  font-weight: 800;
-}
-
-.pill.ok {
-  border-color: rgba(22, 163, 74, 0.25);
-  background: #edfdf3;
-  color: #15803d;
-}
-
-.pill.warning {
-  border-color: rgba(217, 119, 6, 0.28);
-  background: #fff7ed;
-  color: #b45309;
-}
-
-.primary,
-.secondary,
-.ghost,
-.icon-button {
-  min-height: 40px;
-  border: 0;
-  border-radius: 8px;
-  padding: 0 14px;
-  font-weight: 800;
-}
-
-.primary {
-  background: #2563eb;
-  color: #ffffff;
-  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.28);
-}
-
-.secondary {
-  border: 1px solid #bfdbfe;
-  background: #eff6ff;
-  color: #1d4ed8;
-}
-
-.ghost {
-  border: 1px solid #d8e1ed;
-  background: #ffffff;
-  color: #334155;
-}
-
-.icon-button {
-  width: 42px;
-  padding: 0;
-  border: 1px solid #d8e1ed;
-  background: #ffffff;
-  color: #64748b;
-}
-
-.button-pair {
-  display: flex;
-  gap: 8px;
-}
-
-.scenario-grid {
+.body-grid,
+.policy-grid,
+.detail-grid {
   display: grid;
-  gap: 10px;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 12px;
 }
 
-.scenario-card {
-  width: 100%;
-  border: 1px solid #d9e2ee;
-  border-radius: 8px;
-  padding: 14px;
-  background: #ffffff;
-  color: #172033;
-  text-align: left;
-}
-
-.scenario-card:hover,
-.saved-item:hover,
-.history-row:hover {
-  border-color: #93c5fd;
-  background: #f8fbff;
-}
-
-.scenario-card strong,
-.scenario-card span,
-.saved-item strong,
-.saved-item span {
-  display: block;
-}
-
-.scenario-card span,
-.saved-item span,
-.history-row span,
-.policy-note,
-.muted {
-  color: #64748b;
-  font-size: 0.9rem;
-}
-
-.policy-panel {
-  margin-top: 20px;
-  border-top: 1px solid #e2e8f0;
-  padding-top: 18px;
-}
-
-.policy-origin {
-  border: 1px solid #dbeafe;
-  border-radius: 8px;
-  padding: 12px;
-  background: #eff6ff;
-}
-
-.policy-origin span,
-.policy-origin strong {
-  display: block;
-}
-
-.policy-origin span {
-  margin-bottom: 4px;
-  color: #2563eb;
-  font-size: 0.76rem;
-  font-weight: 900;
-  text-transform: uppercase;
-}
-
-.policy-origin strong {
-  overflow-wrap: anywhere;
-  color: #1e3a8a;
-}
-
-.policy-note {
-  margin: 10px 0 14px;
-  line-height: 1.5;
-}
-
-.policy-field {
+.body-grid {
   margin-top: 12px;
 }
 
 .origin-textarea {
-  min-height: 94px;
+  min-height: 96px;
   font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
   font-size: 0.84rem;
 }
 
-.saved-panel {
-  margin-top: 20px;
+.policy-origin {
+  border: 1px solid #bfdbfe;
+  border-radius: 8px;
+  padding: 10px;
+  background: #eff6ff;
+}
+
+.policy-note {
+  margin: 10px 0 12px;
+}
+
+.save-row {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: 8px;
+}
+
+.saved-actions {
+  margin-top: 8px;
 }
 
 .saved-list {
   display: grid;
   gap: 8px;
   margin-top: 12px;
-  max-height: 360px;
+  max-height: 280px;
   overflow: auto;
 }
 
@@ -420,10 +438,10 @@ textarea:focus {
   display: grid;
   grid-template-columns: minmax(0, 1fr) 42px;
   gap: 8px;
-  border: 1px solid #d9e2ee;
+  border: 1px solid #e4e7ec;
   border-radius: 8px;
-  background: #ffffff;
   padding: 8px;
+  background: #ffffff;
 }
 
 .saved-item > button:first-child {
@@ -433,15 +451,41 @@ textarea:focus {
   text-align: left;
 }
 
+.saved-item strong,
+.saved-item span {
+  display: block;
+}
+
+.saved-item span,
+.history-row span {
+  color: #667085;
+  font-size: 0.86rem;
+}
+
+.empty-state {
+  display: grid;
+  min-height: 220px;
+  place-content: center;
+  border: 1px dashed #cfd4dc;
+  border-radius: 8px;
+  background: #f9fafb;
+  color: #667085;
+  text-align: center;
+}
+
+.empty-state strong {
+  margin-bottom: 4px;
+  color: #182230;
+}
+
 .result-summary {
   display: flex;
-  gap: 14px;
+  gap: 12px;
   align-items: center;
-  margin-bottom: 16px;
-  border: 1px solid #dbe3ef;
+  border: 1px solid #e4e7ec;
   border-radius: 8px;
-  padding: 14px;
-  background: #f8fafc;
+  padding: 12px;
+  background: #f9fafb;
 }
 
 .result-summary strong,
@@ -451,9 +495,9 @@ textarea:focus {
 
 .big-status {
   border-radius: 8px;
-  padding: 12px 14px;
+  padding: 10px 12px;
   color: #ffffff;
-  font-size: 0.9rem;
+  font-size: 0.82rem;
   font-weight: 900;
   text-transform: uppercase;
 }
@@ -473,11 +517,26 @@ textarea:focus {
   background: #7c3aed;
 }
 
+.result-meta {
+  margin: 10px 0 12px;
+}
+
+.result-meta span {
+  border: 1px solid #e4e7ec;
+  border-radius: 999px;
+  padding: 5px 9px;
+  background: #ffffff;
+  color: #475467;
+  font-size: 0.82rem;
+  font-weight: 750;
+  overflow-wrap: anywhere;
+}
+
 .alert {
   margin-bottom: 10px;
   border-radius: 8px;
-  padding: 12px;
-  font-weight: 700;
+  padding: 10px 12px;
+  font-weight: 750;
 }
 
 .alert.danger {
@@ -492,19 +551,13 @@ textarea:focus {
   color: #b45309;
 }
 
-.detail-grid {
-  display: grid;
-  grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 14px;
-}
-
 pre {
-  max-height: 360px;
+  max-height: 300px;
   overflow: auto;
-  border: 1px solid #dbe3ef;
+  border: 1px solid #e4e7ec;
   border-radius: 8px;
-  padding: 12px;
-  background: #0f172a;
+  padding: 11px;
+  background: #101828;
   color: #dbeafe;
   font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
   font-size: 0.82rem;
@@ -513,36 +566,41 @@ pre {
   overflow-wrap: anywhere;
 }
 
+.analysis-block {
+  margin-top: 18px;
+}
+
 .diagnostics-list {
   display: grid;
-  gap: 10px;
+  gap: 8px;
   margin: 0;
   padding: 0;
   list-style: none;
 }
 
 .diagnostics-list li {
-  border: 1px solid #dbe3ef;
+  border: 1px solid #e4e7ec;
   border-radius: 8px;
-  padding: 12px;
-  background: #f8fafc;
-  color: #334155;
+  padding: 10px 12px;
+  background: #ffffff;
+  color: #344054;
+  line-height: 1.45;
 }
 
 .history {
-  margin-top: 22px;
+  margin-top: 18px;
 }
 
 .history-row {
   display: grid;
   width: 100%;
   grid-template-columns: 10px minmax(0, 1fr) auto;
-  gap: 10px;
+  gap: 9px;
   align-items: center;
-  border: 1px solid #dbe3ef;
+  border: 1px solid #e4e7ec;
   border-radius: 8px;
   margin-top: 8px;
-  padding: 10px;
+  padding: 9px 10px;
   background: #ffffff;
   color: inherit;
   text-align: left;
@@ -554,77 +612,65 @@ pre {
   border-radius: 999px;
 }
 
-.empty-state {
-  display: grid;
-  min-height: 220px;
-  place-content: center;
-  border: 1px dashed #bfcbda;
-  border-radius: 8px;
-  background: #f8fafc;
-  color: #64748b;
-  text-align: center;
-}
-
-.empty-state strong {
-  color: #172033;
-}
-
-@media (max-width: 1120px) {
-  .hero,
-  .dashboard,
-  .results-layout {
+@media (max-width: 980px) {
+  .topbar,
+  .workspace {
     grid-template-columns: 1fr;
   }
 
-  .side-panel {
-    order: 2;
+  .topbar {
+    display: grid;
+    align-items: start;
+  }
+
+  .workspace {
+    display: grid;
+  }
+
+  .request-grid,
+  .detail-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
   }
 }
 
-@media (max-width: 760px) {
+@media (max-width: 700px) {
   .app-shell {
-    width: min(100% - 20px, 1480px);
-    padding-top: 18px;
+    width: min(100% - 20px, 1280px);
+    padding-top: 16px;
   }
 
   h1 {
-    font-size: 3.1rem;
+    font-size: 1.9rem;
   }
 
-  .request-panel,
-  .side-panel,
-  .result-panel,
-  .analysis-panel {
+  .tester-card,
+  .result-panel {
     padding: 14px;
   }
 
-  .section-heading,
-  .section-subhead,
-  .result-summary {
+  .url-row,
+  .request-grid,
+  .header-row,
+  .body-grid,
+  .policy-grid,
+  .detail-grid,
+  .save-row,
+  .history-row {
+    grid-template-columns: 1fr;
+  }
+
+  .result-heading,
+  .section-subhead {
     align-items: stretch;
     flex-direction: column;
   }
 
-  .control-grid,
-  .body-grid,
-  .header-row,
-  .detail-grid {
-    grid-template-columns: 1fr;
-  }
-
-  .header-row {
-    grid-template-columns: 1fr;
-  }
-
+  .run-button,
   .icon-button {
     width: 100%;
   }
 
-  .history-row {
-    grid-template-columns: 10px minmax(0, 1fr);
-  }
-
   .history-row span:last-child {
-    grid-column: 2;
+    grid-column: 1;
   }
 }