<h1>Choose your theme mode</h1>

<ul class="switches">
  <li>
    <input type="radio" id="light" name="theme-mode" checked>
    <label for="light">
      <span>Light</span>
      <span></span>
    </label>
  </li>
  <li>
    <input type="radio" id="dark" name="theme-mode">
    <label for="dark">
      <span>Dark</span>
      <span></span>
    </label>
  </li>
  <li>
    <input type="radio" id="auto" name="theme-mode">
    <label for="auto">
      <span>Auto</span>
      <span></span>
    </label>
  </li>
</ul>

<footer class="page-footer">
  <span>made by </span>
  <a href="https://georgemartsoukos.com/" target="_blank">
    <img width="24" height="24" src="https://assets.codepen.io/162656/george-martsoukos-small-logo.svg" alt="George Martsoukos logo">
  </a>
</footer>
 

/* RESET STYLES & VARIABLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
:root {
  --white-pearl: #ede1d2;
  --gray: #e8e8ec;
  --slate-gray: #789392;
  --white: #fff;
  --black: black;
  --text-color: var(--black);
  --bg-color: var(--white);
}

.theme-dark {
  color-scheme: dark;
  --text-color: var(--white);
  --bg-color: var(--black);
}

* {
  box-sizing: border-box;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

h1 {
  font-size: 26px;
}

body {
  font-family: "Sora", sans-serif;
  margin: 30px auto;
  text-align: center;
  color: var(--text-color);
  background: var(--bg-color);
}

/* MAIN STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.switches {
  display: inline-block;
  padding: 0;
  border: 1px solid var(--gray);
  margin: 10px 0 0;
  border-radius: 6px;
}

.switches li {
  position: relative;
}

.switches li:not(:last-child) {
  border-bottom: 1px solid var(--gray);
}

.switches li [type="radio"] {
  position: absolute;
  left: -9999px;
}

.switches label {
  display: grid;
  grid-template-columns: 40px auto;
  align-items: center;
  gap: 10px;
  padding: 20px;
  cursor: pointer;
}

.switches span {
  flex-shrink: 0;
}

.switches span:empty {
  position: relative;
  width: 50px;
  height: 26px;
  border-radius: 15px;
  background: var(--gray);
  transition: all 0.3s;
}

.switches span:empty::before,
.switches span:empty::after {
  content: "";
  position: absolute;
}

.switches span:empty::before {
  top: 1px;
  left: 1px;
  width: 24px;
  height: 24px;
  background: var(--slate-gray);
  border-radius: 50%;
  z-index: 1;
  transition: transform 0.3s;
}

.switches span:empty::after {
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  left: 6px;
  background-size: 14px 14px;
}

.switches [type="radio"]:checked + label span:empty {
  background: var(--white-pearl);
}

.switches [type="radio"]:checked + label span:empty::before {
  transform: translateX(24px);
}

.switches li:nth-child(1) [type="radio"]:checked + label span:empty::after {
  background-image: url("data:image/svg+xml;base64,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");
}

.switches li:nth-child(2) [type="radio"]:checked + label span:empty::after {
  background-image: url("data:image/svg+xml;base64,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");
}

.switches li:nth-child(3) [type="radio"]:checked + label span:empty::after {
  background-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA1MTIgNTEyIj48IS0tIUZvbnQgQXdlc29tZSBGcmVlIDYuNy4yIGJ5IEBmb250YXdlc29tZSAtIGh0dHBzOi8vZm9udGF3ZXNvbWUuY29tIExpY2Vuc2UgLSBodHRwczovL2ZvbnRhd2Vzb21lLmNvbS9saWNlbnNlL2ZyZWUgQ29weXJpZ2h0IDIwMjQgRm9udGljb25zLCBJbmMuLS0+PHBhdGggZD0iTTQ0OCAyNTZjMC0xMDYtODYtMTkyLTE5Mi0xOTJsMCAzODRjMTA2IDAgMTkyLTg2IDE5Mi0xOTJ6TTAgMjU2YTI1NiAyNTYgMCAxIDEgNTEyIDBBMjU2IDI1NiAwIDEgMSAwIDI1NnoiLz48L3N2Zz4=");
}

/* FOOTER STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.page-footer {
  position: fixed;
  right: 0;
  bottom: 50px;
  display: flex;
  align-items: center;
  padding: 5px;
  font-size: 0.9em;
  color: var(--text-color);
  background: var(--bg-color);
}

.page-footer a {
  display: flex;
  margin-left: 4px;
}

const html = document.documentElement;
const switches = document.querySelector(".switches");
const inputs = switches.querySelectorAll("input");

if (localStorage.getItem("dark-mode")) {
  html.classList.add("theme-dark");
}

if (localStorage.getItem("selected-radio")) {
  switches.querySelector(`#${localStorage.getItem("selected-radio")}`).checked =
    "true";
}

const setTheme = (theme) => {
  if (theme === "dark") {
    html.classList.add("theme-dark");
    localStorage.setItem("dark-mode", "true");
  } else {
    html.classList.remove("theme-dark");
    localStorage.removeItem("dark-mode");
  }
};

const handleMediaChange = (e) => {
  if (switches.querySelector('[type="radio"]:checked').id === "auto") {
    setTheme(e.matches ? "dark" : "light");
  }
};

const handleInputChange = (e) => {
  const themeMode = e.target.id;
  if (
    themeMode === "dark" ||
    (themeMode === "auto" &&
      window.matchMedia("(prefers-color-scheme: dark)").matches)
  ) {
    setTheme("dark");
  } else {
    setTheme("light");
  }
  localStorage.setItem("selected-radio", themeMode);
};

window
  .matchMedia("(prefers-color-scheme: dark)")
  .addEventListener("change", handleMediaChange);

inputs.forEach((input) => input.addEventListener("input", handleInputChange));