<nav>
  <a href="#" id="home" class="active">Home</a>
  <a href="#" id="dashboard">Dashboard</a>
  <a href="#" id="profile">Profile</a>
  <a href="#" id="notifications" data-count="1">Notifications</a>
  <a href="#" id="settings">Settings</a>
</nav>

<main>
  <div class="hint">
    <p>Hover over any link, and the other links will be blurred out. <br />
      Additionally, the notification count will automatically increase for the demo.</p>
  </div>

  <div class="credits">
    &copy; 2024 - Gaurav Sachdeva
    <a href="https://redirect.gauravsachdeva.in?page=blog" target="_blank">Blog</a> |
    <a href="https://redirect.gauravsachdeva.in?page=codepen" target="_blank">CodePen</a> |
    <a href="https://redirect.gauravsachdeva.in?page=github" target="_blank">Github</a>
  </div>
</main>

@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans&display=swap");

* {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  box-sizing: border-box;
}

body {
  display: flex;
  background: gainsboro;
  font-size: large;
  margin: 3.5rem 0.5rem;
  flex-direction: column;
  text-align: center;
}

nav {
  display: flex;
  background-color: #e7e7e7;
  margin: 0 auto;
  padding: 0rem 0.55rem;
  border: 2px solid #bbb;
  border-radius: 1rem;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

nav a {
  display: inline-block;
  color: #333;
  text-decoration: none;
  padding: 1rem 1.5rem;
  margin: 0;
  border: 2px solid #bbb;
  border-width: 0 1px;
  transition: all 0.3s ease;
}

nav a:first-child {
  border-left: 0;
}

nav a:last-child {
  border-right: 0;
}

nav a.active {
  font-weight: bold;
}

nav a:hover {
  background-color: #ddd;
  border-radius: 0.5rem;
}

nav:hover a:not(:hover) {
  opacity: 0.5;
  color: transparent;
  text-shadow: 0 0 0.25rem #000;
}

a[data-count]:after {
  content: attr(data-count);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 0.2rem;
  background-color: darkgreen;
  color: white;
  border-radius: 50%;
  width: 1.5rem;
  height: 1.5rem;
  font-size: 0.75rem;
  font-weight: bold;
  position: relative;
  top: -0.15rem;
}

a.alert[data-count]:after {
  background-color: maroon;
}

main {
  margin: 3rem;
}

main .credits,
main .credits a {
  margin-top: 5rem;
  color: #555;
}

let timer = setInterval(increaseNotificationCnt, 2500);

function increaseNotificationCnt() {
  const notifications = document.querySelector("a#notifications");
  const count = parseInt(notifications.getAttribute("data-count") || 0);
  const newCount = count + 1;
  notifications.setAttribute("data-count", newCount);

  if (newCount > 10) notifications.classList.add("alert");
  if (newCount > 30) clearInterval(timer);
}