diff --git a/index.html b/index.html
index 4098ad2..440bfab 100644
--- a/index.html
+++ b/index.html
@@ -4,16 +4,16 @@
   <meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1">
   <meta name="theme-color" content="#f7931a">
   <meta name="description" content="A private Bitcoin playground. Mine fake coins, inscribe a thought, and follow it into a block.">
-  <title>Super Testnet — your little Bitcoin universe</title>
+  <title>Super Testnet — your own little Bitcoin universe</title>
   <link rel="icon" type="image/svg+xml" href="/favicon.svg">
 </head>
 <body>
   <header>
-    <a class="brand" href="#"><span class="mark">S↗</span> SUPER TESTNET <span class="version">v0</span></a>
+    <a class="brand" href="#"><span class="mark" aria-hidden="true"></span> SUPER TESTNET <span class="version">v0</span></a>
     <div class="header-actions"><span class="network"><i></i> PRIVATE LOCAL CHAIN</span><button id="theme-toggle" class="theme-toggle quiet" type="button" aria-label="Toggle color theme">☀ Light</button></div>
   </header>
   <main>
-    <section class="hero"><div><p class="eyebrow">BITCOIN, WITH ROOM TO EXPERIMENT</p><h1>Your little<br>Bitcoin universe.</h1><p class="intro">Mine a block. Inscribe a thought. See it land in your wallet.<br>All in your browser, all with pretend money.</p></div><div class="orbit" aria-hidden="true"><div class="cube"><svg viewBox="0 0 100 100" width="82" height="82" fill="none" stroke="currentColor" stroke-width="5" aria-hidden="true"><path d="M35 17v12m12-12v12M35 76v12m12-12v12M24 29h25c22 0 22 23 0 23H24m0 0h28c22 0 22 24 0 24H24m7-47v47"/></svg></div><span>YOUR CHAIN. YOUR PACE.</span></div></section>
+    <section class="hero"><div><p class="eyebrow">BITCOIN, WITH ROOM TO EXPERIMENT</p><h1>Your own little<br>Bitcoin universe.</h1><p class="intro">Mine a block. Inscribe a thought. See it land in your wallet.<br>All in your browser, all with pretend money.</p></div><div class="orbit" aria-hidden="true"><div class="cube"><svg viewBox="0 0 100 100" width="82" height="82" fill="none" stroke="currentColor" stroke-width="5" aria-hidden="true"><path d="M35 17v12m12-12v12M35 76v12m12-12v12M24 29h25c22 0 22 23 0 23H24m0 0h28c22 0 22 24 0 24H24m7-47v47"/></svg></div><span>YOUR CHAIN. YOUR PACE.</span></div></section>
     <aside class="notice"><strong>Test coins only.</strong> This is a private simulation, not Bitcoin testnet or mainnet. Keys stay in this browser, unencrypted. Never load real keys or send real funds here.</aside>
     <div id="status" role="status" aria-live="polite">Create a test wallet to start your first loop.</div>
     <section class="workspace">
diff --git a/public/favicon.svg b/public/favicon.svg
index 21f5083..0543594 100644
--- a/public/favicon.svg
+++ b/public/favicon.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><rect width="64" height="64" rx="16" fill="#d4ff76"/><text x="13" y="46" font-size="42" font-family="sans-serif" font-weight="bold" fill="#142016">S</text></svg>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 34 34"><rect width="34" height="34" rx="8" fill="#f7931a"/></svg>
diff --git a/src/main.js b/src/main.js
index 53fa0ae..86d6546 100644
--- a/src/main.js
+++ b/src/main.js
@@ -38,7 +38,7 @@ function setTheme(theme, persist = false) {
 }
 function initTheme() {
   const saved = localStorage.getItem(THEME_KEY);
-  setTheme(saved === 'light' || saved === 'dark' ? saved : (matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark'));
+  setTheme(saved === 'light' || saved === 'dark' ? saved : 'dark');
 }
 function download(name, contents) {
   const url = URL.createObjectURL(new Blob([contents], { type: 'application/json' }));
diff --git a/src/style.css b/src/style.css
index 646b9a5..a587e13 100644
--- a/src/style.css
+++ b/src/style.css
@@ -1 +1 @@
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var(--line);border-radius:10px;padding:35px;text-align:center;color:var(--muted);font-size:14px;line-height:1.9;margin:0}.empty span{font-size:12px;color:var(--muted)}.collectible{border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:20px;min-width:0}.collectible pre{background:transparent;border:0;padding:15px 0;min-height:68px;color:var(--text);margin:0;font:17px/1.5 Georgia,serif}.collectible .tag{display:inline-block}.collectible a{font:11px monospace;overflow-wrap:anywhere}.collectible p{margin:12px 0 0}.chain-board{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;overflow:hidden}.mempool-head,.blocks-head{display:flex;align-items:end;justify-content:space-between;gap:16px}.mempool-head strong{display:block;margin-top:4px;font-size:14px}.chain-kicker{font:10px monospace;letter-spacing:1.6px;color:var(--orange)}.mempool-list{display:flex;gap:10px;overflow-x:auto;padding:16px 0 6px}.mempool-empty{border:1px dashed var(--line);border-radius:9px;padding:14px 16px;color:var(--muted);font-size:12px;min-width:260px}.mempool-card{min-width:210px;max-width:240px;text-align:left;background:color-mix(in srgb,var(--orange) 7%,var(--panel));border-color:color-mix(in srgb,var(--orange) 32%,var(--line));padding:14px}.mempool-card strong,.mempool-card span{display:block}.mempool-card strong{font:12px monospace;color:var(--orange);margin-bottom:8px}.mempool-card span{font:11px monospace;color:var(--muted);line-height:1.55}.chain-divider{height:34px;border-left:1px dashed var(--line);margin:2px 0 10px 22px;position:relative}.chain-divider span{position:absolute;left:10px;top:8px;font:9px monospace;color:var(--muted);letter-spacing:1px}.blocks-head{margin-bottom:12px}.blocks{display:flex;gap:12px;overflow-x:auto;padding-bottom:10px}.block-card{min-width:190px;text-align:left;padding:15px;background:var(--panel-2);position:relative}.block-card:before{content:"";position:absolute;left:-13px;top:50%;width:12px;border-top:2px solid var(--orange);opacity:.55}.block-card:last-child:before{display:none}.block-card strong{display:block;font:22px monospace;margin-bottom:9px}.block-card span{display:block;font:10px monospace;color:var(--muted);line-height:1.55}.block-card .block-accent{color:var(--orange);font-weight:700;margin-bottom:6px}.inspector{margin-top:16px;scroll-margin-top:20px}.inspector p{overflow-wrap:anywhere}.inspector code{font-size:12px;overflow-wrap:anywhere}.inspector h2{font-weight:500;font-size:22px}.inspector a{font-size:12px;overflow-wrap:anywhere}.tx-links{display:flex;gap:16px;flex-wrap:wrap}.about{margin-top:40px;border-top:1px solid var(--line);padding:20px 0;color:var(--muted);font-size:12px;line-height:1.8}.about summary{cursor:pointer;color:var(--text)}.about p{max-width:900px}footer{border-top:1px solid var(--line);padding:22px 0;display:flex;align-items:center;justify-content:space-between;font:10px monospace;color:var(--muted);letter-spacing:1px}.danger{color:var(--danger)}[hidden]{display:none!important}@media(max-width:1240px){main{margin:0 32px}}@media(max-width:700px){header{padding:18px;gap:10px}.header-actions{gap:8px}.network{display:none}.brand{font-size:12px;gap:7px}main{margin:0 18px}.hero{padding:36px 0 20px}.orbit{display:none}h1{letter-spacing:-2px}.intro{font-size:14px}.workspace{grid-template-columns:1fr}.inscribe{grid-column:auto}.panel{padding:20px}.tag{font-size:8px}.collectibles{grid-template-columns:1fr}.section-title{align-items:start}.section-title h2{font-size:21px}.section-title>.muted{font-size:10px!important}.compose-footer{gap:10px}.compose-footer button{font-size:12px}.notice{font-size:11px}.mempool-head,.blocks-head{align-items:start;flex-direction:column;gap:4px}.mempool-card{min-width:180px}.block-card{min-width:175px}footer{gap:10px}}select{width:100%;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:12px;min-width:0}select:focus{outline-color:var(--orange)}.inscription-preview{display:block;width:100%;max-height:300px;min-height:120px;object-fit:contain;border:1px solid var(--line);border-radius:8px;margin:12px 0;background:white}
diff --git a/tests/flow.spec.js b/tests/flow.spec.js
index 9c518b9..492df44 100644
--- a/tests/flow.spec.js
+++ b/tests/flow.spec.js
@@ -66,8 +66,9 @@ test('create → mine → mempool → inscription → block/transaction → relo
   await page.screenshot({path:`test-results/${test.info().project.name}-complete.png`,fullPage:true});
 });
 
-test('theme toggle persists explicit light/dark preference', async ({page}) => {
-  await page.emulateMedia({colorScheme:'dark'});
+for (const colorScheme of ['light', 'dark']) {
+test(`dark default and explicit theme persistence with ${colorScheme} system preference`, async ({page}) => {
+  await page.emulateMedia({colorScheme});
   await page.goto('/');
   await expect(page.locator('html')).toHaveAttribute('data-theme','dark');
   await expect(page.getByRole('button',{name:'Switch to light mode'})).toBeVisible();
@@ -76,7 +77,13 @@ test('theme toggle persists explicit light/dark preference', async ({page}) => {
   await page.reload();
   await expect(page.locator('html')).toHaveAttribute('data-theme','light');
   await expect(page.getByRole('button',{name:'Switch to dark mode'})).toBeVisible();
+  expect(await page.evaluate(() => localStorage.getItem('super-testnet-theme'))).toBe('light');
+  await page.getByRole('button',{name:'Switch to dark mode'}).click();
+  await page.reload();
+  await expect(page.locator('html')).toHaveAttribute('data-theme','dark');
+  expect(await page.evaluate(() => localStorage.getItem('super-testnet-theme'))).toBe('dark');
 });
+}
 
 test('wallet backup reload and rejected oversized or invalid input',async({page})=>{
   await page.goto('/'); await page.getByRole('button',{name:'Create test wallet'}).click();