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I have the following html, css & js code for a simple website. This displays fine on Chrome and Safari on desktop as well as mobile. However, the colors seem to get inverted when viewing on Brave & Opera on mobile in dark mode only. For example, the list background shows the --link-color instead of the --list-bg color when in Opera & Brave's dark theme on mobile. The headers also turn white instead of having the --text-color among other issues with footer display etc. I assumed it should work consistently since I am specifying each and every color so I'm not sure why it won't show correctly. Any help is appreciated.

Screenshots:

function initThemeSwitch() {
  const themeSwitch = document.querySelector('.theme-switch input[type="checkbox"]');
  if (!themeSwitch) return;

  // Check system preference
  const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;

  function getThemePreference() {
    const savedTheme = localStorage.getItem('theme');
    return savedTheme || (prefersDark ? 'dark' : 'light');
  }

  function updateTheme(theme) {
    document.documentElement.setAttribute('data-theme', theme);
    if (themeSwitch) {
      themeSwitch.checked = theme === 'dark';
    }
  }

  // Initial setup
  updateTheme(getThemePreference());

  // observe theme changes
  window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', e => {
    if (!localStorage.getItem('theme')) { // Only react to system changes if user hasn't set a preference
      const newTheme = e.matches ? 'dark' : 'light';
      updateTheme(newTheme);
    }
  });

  // toggle changes
  themeSwitch.addEventListener('change', function(e) {
    const theme = e.target.checked ? 'dark' : 'light';
    localStorage.setItem('theme', theme);
    updateTheme(theme);
  });

  // observe changes in localStorage from other pages
  window.addEventListener('storage', function(e) {
    if (e.key === 'theme') {
      updateTheme(e.newValue);
    }
  });

  // Optional: Listen for visibility changes to ensure sync when tab becomes visible
  document.addEventListener('visibilitychange', function() {
    if (document.visibilityState === 'visible') {
      updateTheme(getThemePreference());
    }
  });
}

// Initialize on DOM content loaded
if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', initThemeSwitch);
} else {
  initThemeSwitch(); // Call directly if DOM is already loaded
}
/* Import fonts */
@import url('+Elite&display=swap');

/* Theme Variables */
:root {
  /* Light theme */
  --bg-overlay: none;
  --text-color: #271B08;
  --list-bg: white;
  --link-color: #2c3e50;
  --link-hover-bg: #f8f9fa;
  --link-hover-color: #1a252f;
  --footer-disclaimer-link-hover-color: #1a252f;
  --border-color: #eee;
  --muted-color: gray;
}

[data-theme="dark"] {
  /* Dark theme */
  --bg-overlay: linear-gradient(rgba(237, 221, 195, 0.4), rgba(237, 221, 195, 0.4));
  --text-color: #271B08;
  --list-bg: #EDDDC3;
  --link-color: #271B08;
  --link-hover-bg: #746556;
  --link-hover-color: #EDDDC3;
  --footer-disclaimer-link-hover-color: #746556;
  --border-color: #746556;
  --muted-color: #746556;
  --footer-link-hover: #271B08;
}

/* Base styles */
body {
  background-size: cover;
  color: var(--text-color);
  font-family: 'Special Elite', monospace;
  margin: 0;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container {
  max-width: 800px;
  width: 100%;
  padding: 20px;
  border-radius: 8px;
  box-sizing: border-box;
  margin: 0 auto;
}

h1,
h2,
h3 {
  text-align: center;
  color: var(--text-color);
}

h3 {
  margin-top: 2em;
  margin-bottom: 1em;
  font-size: 1.2em;
}

.project-list {
  display: flex;
  flex-direction: column;
  background-color: var(--list-bg);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.project-link {
  position: relative;
  display: block;
  padding: 10px;
  margin: 5px 0;
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s ease;
  padding-right: 100px;
}

.project-link:hover {
  background-color: var(--link-hover-bg);
  color: var(--link-hover-color);
}

.project-link-text {
  display: block;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.project-domain {
  position: absolute;
  font-size: small;
  right: 10px;
  top: 10px;
  color: var(--muted-color);
  white-space: nowrap;
}

.project-link:hover .project-domain {
  color: var(--link-hover-color);
}

.footer,
.disclaimer {
  text-align: center;
  color: var(--text-color);
  margin-top: 20px;
  font-size: 14px;
}

.footer {
  padding: 10px;
}

.disclaimer p {
  margin: 10px 0;
}

.footer a,
.disclaimer a {
  text-decoration: none;
  color: var(--link-color);
  margin: 5px;
  font-size: 14px;
}

.footer a:hover,
.disclaimer a:hover {
  color: var(--footer-disclaimer-link-hover-color);
  text-decoration: underline;
}

.theme-switch-wrapper {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin: 20px 0;
  width: 100%;
}

.theme-switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #746556;
  transition: 0.4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "☀️";
  display: flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked+.slider {
  background-color: #271B08;
}

input:checked+.slider:before {
  transform: translateX(26px);
  content: "

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