diff --git a/static/css/01-foundation/_themes.css b/static/css/01-foundation/_themes.css
index d8d9372..ff0a07a 100644
--- a/static/css/01-foundation/_themes.css
+++ b/static/css/01-foundation/_themes.css
@@ -181,7 +181,7 @@
    THEME SWITCHER BUTTON STYLES - Dynamic colors based on theme mode
    ============================================================================== */
 .color-theme-switcher {
-  position: fixed;
+  position: fixed !important; /* Override .has-tooltip position: relative */
   bottom: 14rem; /* Middle position - between print (18rem) and shortcuts (10rem) */
   left: 2rem;
   width: 50px;
diff --git a/tests/mjs/32-all-tooltips-final-test.mjs b/tests/mjs/32-all-tooltips-final-test.mjs
new file mode 100755
index 0000000..bbba551
--- /dev/null
+++ b/tests/mjs/32-all-tooltips-final-test.mjs
@@ -0,0 +1,135 @@
+#!/usr/bin/env bun
+import { chromium } from 'playwright';
+
+(async () => {
+  const browser = await chromium.launch({ headless: false });
+
+  console.log('========================================');
+  console.log('  COMPREHENSIVE TOOLTIP TEST');
+  console.log('  Testing ALL buttons on desktop & mobile');
+  console.log('========================================\n');
+
+  // ========== DESKTOP TEST ==========
+  console.log('📱 DESKTOP TEST (1920x1080)');
+  console.log('─────────────────────────────\n');
+
+  const desktopPage = await browser.newPage({ viewport: { width: 1920, height: 1080 } });
+  await desktopPage.goto('http://localhost:1999/');
+  await desktopPage.waitForLoadState('networkidle');
+  await desktopPage.waitForTimeout(1000);
+
+  const desktopButtons = [
+    { id: 'download-button', name: 'Download PDF', expectedPosition: 'right' },
+    { id: 'print-friendly-button', name: 'Print Friendly', expectedPosition: 'right' },
+    { id: 'zoom-toggle-button', name: 'Zoom Toggle', expectedPosition: 'right' },
+    { id: 'shortcuts-button', name: 'Keyboard Shortcuts', expectedPosition: 'right' },
+    { id: 'color-theme-switcher', name: 'Theme Switcher', expectedPosition: 'right' },
+    { id: 'info-button', name: 'Info Button', expectedPosition: 'right' },
+    { id: 'back-to-top', name: 'Back to Top', expectedPosition: 'left' }
+  ];
+
+  for (const btn of desktopButtons) {
+    const button = desktopPage.locator(`#${btn.id}`);
+    const exists = await button.count() > 0;
+
+    if (!exists) {
+      console.log(`❌ ${btn.name}: NOT FOUND in DOM`);
+      continue;
+    }
+
+    const isVisible = await button.isVisible();
+    console.log(`${isVisible ? '✅' : '❌'} ${btn.name}: ${isVisible ? 'Visible' : 'Not visible'}`);
+
+    if (isVisible) {
+      // Test tooltip
+      await button.hover();
+      await desktopPage.waitForTimeout(300);
+
+      const tooltip = await desktopPage.evaluate((id) => {
+        const btn = document.getElementById(id);
+        if (!btn) return null;
+
+        const computed = window.getComputedStyle(btn, '::before');
+        return {
+          opacity: computed.opacity,
+          visibility: computed.visibility,
+          content: computed.content,
+          position: computed.position
+        };
+      }, btn.id);
+
+      if (tooltip && parseFloat(tooltip.opacity) > 0.5) {
+        console.log(`   💬 Tooltip: VISIBLE (opacity: ${tooltip.opacity})`);
+      } else {
+        console.log(`   ⚠️  Tooltip: NOT visible or low opacity`);
+      }
+    }
+  }
+
+  await desktopPage.screenshot({
+    path: '/Users/txeo/Git/yo/cv/tests/mjs/screenshots/all-tooltips-desktop.png',
+    fullPage: false
+  });
+  console.log('\n📸 Desktop screenshot saved\n');
+
+  await desktopPage.close();
+
+  // ========== MOBILE TEST ==========
+  console.log('📱 MOBILE TEST (375x667 - iPhone SE)');
+  console.log('─────────────────────────────\n');
+
+  const mobilePage = await browser.newPage({ viewport: { width: 375, height: 667 } });
+  await mobilePage.goto('http://localhost:1999/');
+  await mobilePage.waitForLoadState('networkidle');
+  await mobilePage.waitForTimeout(1000);
+
+  const mobileButtons = [
+    { id: 'download-button', name: 'Download PDF' },
+    { id: 'print-friendly-button', name: 'Print Friendly' },
+    { id: 'shortcuts-button', name: 'Keyboard Shortcuts' },
+    { id: 'color-theme-switcher', name: 'Theme Switcher' },
+    { id: 'info-button', name: 'Info Button' }
+  ];
+
+  console.log('Checking button visibility and positions on mobile...\n');
+
+  for (const btn of mobileButtons) {
+    const button = mobilePage.locator(`#${btn.id}`);
+    const exists = await button.count() > 0;
+
+    if (!exists) {
+      console.log(`❌ ${btn.name}: NOT FOUND`);
+      continue;
+    }
+
+    const isVisible = await button.isVisible();
+    const box = isVisible ? await button.boundingBox() : null;
+
+    if (isVisible && box) {
+      // Check if button is in bottom dock (y > 500 for iPhone SE height 667)
+      const inBottomDock = box.y > 500;
+      console.log(`${isVisible ? '✅' : '❌'} ${btn.name}: Visible at y=${Math.round(box.y)} ${inBottomDock ? '(bottom dock)' : ''}`);
+
+      // Tooltips are hidden on mobile touch devices, so we don't test them
+    } else {
+      console.log(`❌ ${btn.name}: Not visible or no bounding box`);
+    }
+  }
+
+  await mobilePage.screenshot({
+    path: '/Users/txeo/Git/yo/cv/tests/mjs/screenshots/all-tooltips-mobile.png',
+    fullPage: true
+  });
+  console.log('\n📸 Mobile screenshot saved\n');
+
+  await mobilePage.close();
+
+  // ========== SUMMARY ==========
+  console.log('========================================');
+  console.log('  TEST COMPLETE');
+  console.log('========================================');
+  console.log('\n✅ All tests completed successfully!');
+  console.log('📸 Screenshots saved to tests/mjs/screenshots/\n');
+
+  await browser.close();
+})();
diff --git a/tests/mjs/debug-css-cascade.mjs b/tests/mjs/debug-css-cascade.mjs
new file mode 100755
index 0000000..668a649
--- /dev/null
+++ b/tests/mjs/debug-css-cascade.mjs
@@ -0,0 +1,48 @@
+#!/usr/bin/env bun
+import { chromium } from 'playwright';
+
+(async () => {
+  const browser = await chromium.launch({ headless: false });
+  const page = await browser.newPage();
+
+  await page.goto('http://localhost:1999/');
+  await page.waitForLoadState('networkidle');
+  await page.waitForTimeout(1000);
+
+  // Get all CSS rules affecting the theme button
+  const cssRules = await page.evaluate(() => {
+    const btn = document.getElementById('color-theme-switcher');
+    if (!btn) return null;
+
+    const matchedRules = [];
+
+    // Get all stylesheets
+    for (const sheet of document.styleSheets) {
+      try {
+        const rules = sheet.cssRules || sheet.rules;
+        for (const rule of rules) {
+          if (rule.selectorText && btn.matches(rule.selectorText)) {
+            matchedRules.push({
+              selector: rule.selectorText,
+              position: rule.style.position || 'not set',
+              bottom: rule.style.bottom || 'not set',
+              left: rule.style.left || 'not set',
+              source: sheet.href || 'inline',
+              cssText: rule.cssText
+            });
+          }
+        }
+      } catch (e) {
+        // Skip CORS blocked stylesheets
+      }
+    }
+
+    return matchedRules;
+  });
+
+  console.log('📋 CSS Rules matching #color-theme-switcher:');
+  console.log(JSON.stringify(cssRules, null, 2));
+
+  await page.waitForTimeout(5000);
+  await browser.close();
+})();
diff --git a/tests/mjs/debug-theme-button.mjs b/tests/mjs/debug-theme-button.mjs
new file mode 100755
index 0000000..166500d
--- /dev/null
+++ b/tests/mjs/debug-theme-button.mjs
@@ -0,0 +1,69 @@
+#!/usr/bin/env bun
+import { chromium } from 'playwright';
+
+(async () => {
+  const browser = await chromium.launch({ headless: false });
+  const page = await browser.newPage();
+
+  // Navigate to page
+  await page.goto('http://localhost:1999/');
+  await page.waitForLoadState('networkidle');
+  await page.waitForTimeout(1000);
+
+  // Check if theme button exists
+  const themeButton = page.locator('#color-theme-switcher');
+  const exists = await themeButton.count() > 0;
+  console.log('✅ Theme button exists in DOM:', exists);
+
+  if (exists) {
+    // Get computed styles
+    const isVisible = await themeButton.isVisible();
+    console.log('🔍 Button isVisible():', isVisible);
+
+    const box = await themeButton.boundingBox();
+    console.log('📦 Bounding box:', box);
+
+    // Get computed styles manually
+    const styles = await page.evaluate(() => {
+      const btn = document.getElementById('color-theme-switcher');
+      if (!btn) return null;
+
+      const computed = window.getComputedStyle(btn);
+      return {
+        display: computed.display,
+        visibility: computed.visibility,
+        opacity: computed.opacity,
+        position: computed.position,
+        bottom: computed.bottom,
+        left: computed.left,
+        width: computed.width,
+        height: computed.height,
+        background: computed.background,
+        backgroundColor: computed.backgroundColor,
+        zIndex: computed.zIndex,
+        transform: computed.transform,
+      };
+    });
+
+    console.log('🎨 Computed styles:', JSON.stringify(styles, null, 2));
+
+    // Check --black-bar variable
+    const blackBar = await page.evaluate(() => {
+      return getComputedStyle(document.documentElement).getPropertyValue('--black-bar');
+    });
+    console.log('🔧 --black-bar variable:', blackBar || 'NOT DEFINED');
+
+    // Take screenshot
+    await page.screenshot({
+      path: '/Users/txeo/Git/yo/cv/tests/mjs/screenshots/theme-button-debug.png',
+      fullPage: false
+    });
+    console.log('📸 Screenshot saved');
+  }
+
+  // Keep browser open for manual inspection
+  console.log('\n⏸️  Browser kept open for inspection. Press Ctrl+C to close.');
+  await page.waitForTimeout(60000);
+
+  await browser.close();
+})();
diff --git a/tests/mjs/screenshots/all-tooltips-desktop.png b/tests/mjs/screenshots/all-tooltips-desktop.png
new file mode 100644
index 0000000..b046c79
Binary files /dev/null and b/tests/mjs/screenshots/all-tooltips-desktop.png differ
diff --git a/tests/mjs/screenshots/all-tooltips-mobile.png b/tests/mjs/screenshots/all-tooltips-mobile.png
new file mode 100644
index 0000000..45b0ed8
Binary files /dev/null and b/tests/mjs/screenshots/all-tooltips-mobile.png differ
diff --git a/tests/mjs/screenshots/theme-button-debug.png b/tests/mjs/screenshots/theme-button-debug.png
new file mode 100644
index 0000000..9ea4fcb
Binary files /dev/null and b/tests/mjs/screenshots/theme-button-debug.png differ
diff --git a/tests/mjs/screenshots/theme-button-fixed.png b/tests/mjs/screenshots/theme-button-fixed.png
new file mode 100644
index 0000000..d452467
Binary files /dev/null and b/tests/mjs/screenshots/theme-button-fixed.png differ
diff --git a/tests/mjs/verify-theme-button-fix.mjs b/tests/mjs/verify-theme-button-fix.mjs
new file mode 100755
index 0000000..93d4eda
--- /dev/null
+++ b/tests/mjs/verify-theme-button-fix.mjs
@@ -0,0 +1,86 @@
+#!/usr/bin/env bun
+import { chromium } from 'playwright';
+
+(async () => {
+  const browser = await chromium.launch({ headless: false });
+  const page = await browser.newPage({ viewport: { width: 1920, height: 1080 } });
+
+  console.log('🔍 Testing theme button visibility on DESKTOP...\n');
+
+  await page.goto('http://localhost:1999/');
+  await page.waitForLoadState('networkidle');
+  await page.waitForTimeout(1000);
+
+  // Check theme button
+  const themeButton = page.locator('#color-theme-switcher');
+  const exists = await themeButton.count() > 0;
+  console.log(exists ? '✅ Theme button exists in DOM' : '❌ Theme button NOT in DOM');
+
+  if (exists) {
+    const isVisible = await themeButton.isVisible();
+    console.log(isVisible ? '✅ Theme button is VISIBLE' : '❌ Theme button is NOT visible');
+
+    const box = await themeButton.boundingBox();
+    console.log('\n📦 Bounding box:', box);
+
+    // Check if Y position is positive (on screen)
+    if (box && box.y > 0) {
+      console.log('✅ Button is ON SCREEN (y > 0)');
+    } else if (box && box.y < 0) {
+      console.log('❌ Button is ABOVE SCREEN (y < 0) - STILL BROKEN');
+    }
+
+    // Get computed position
+    const position = await page.evaluate(() => {
+      const btn = document.getElementById('color-theme-switcher');
+      const computed = window.getComputedStyle(btn);
+      return {
+        position: computed.position,
+        bottom: computed.bottom,
+        left: computed.left,
+        top: computed.top
+      };
+    });
+
+    console.log('\n🎨 Computed position:', position);
+
+    if (position.position === 'fixed') {
+      console.log('✅ Position is FIXED (correct!)');
+    } else {
+      console.log(`❌ Position is ${position.position} (should be fixed)`);
+    }
+
+    // Take screenshot
+    await page.screenshot({
+      path: '/Users/txeo/Git/yo/cv/tests/mjs/screenshots/theme-button-fixed.png',
+      fullPage: false
+    });
+    console.log('\n📸 Screenshot saved to screenshots/theme-button-fixed.png');
+
+    // Test tooltip
+    console.log('\n🎯 Testing tooltip...');
+    await themeButton.hover();
+    await page.waitForTimeout(500);
+
+    const tooltipVisible = await page.evaluate(() => {
+      const btn = document.getElementById('color-theme-switcher');
+      const computed = window.getComputedStyle(btn, '::before');
+      return {
+        opacity: computed.opacity,
+        visibility: computed.visibility,
+        content: computed.content
+      };
+    });
+
+    console.log('💬 Tooltip state:', tooltipVisible);
+    if (parseFloat(tooltipVisible.opacity) > 0.5) {
+      console.log('✅ Tooltip is VISIBLE on hover');
+    } else {
+      console.log('⚠️  Tooltip opacity is low or hidden');
+    }
+  }
+
+  console.log('\n✅ Test complete - browser will close in 5 seconds');
+  await page.waitForTimeout(5000);
+  await browser.close();
+})();