JavaScript: Guess Number Game

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jonas schmedtmann (Udemy):

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <link rel="stylesheet" href="style.css" />
    <title>Guess My Number!</title>
    <script src="script.js" defer></script>
  </head>
  <body>
    <header>
      <h1>Guess My Number!</h1>
      <p class="between">(Between 1 and 20)</p>
      <button class="btn again">Play Again!</button>
      <div class="number">?</div>
    </header>
    <main>
      <section class="left">
        <input class="guess" type="number">
        <button class="btn check">Check!</button>
      </section>
      <section class="right">
        <p class="message">Start guessing...</p>
        <p class="label-score">? Score: <span class="score">20</span></p>
        <p class="label-highscore">
          ? Highscore: <span class="highscore">0</span>
        </p>
      </section>
    </main>
    
  </body>
</html>


let secretNumber = Math.trunc(Math.random() * 20 + 1);
// state variable - part of the state of the code - not in the DOM
let score = 20;
let highscore = 0;

document.querySelector('.check').addEventListener('click', function () {
  const guess = Number(document.querySelector('.guess').value);

  // When no input
  if (!guess) {
    document.querySelector('.message').textContent =
      'No Number Entered! Try Again!';

    // When player wins
  } else if (guess === secretNumber) {
    document.querySelector('.message').textContent = 'Correct Number! You Win!';
    document.querySelector('.number').textContent = secretNumber;

    // change bg on win
    document.querySelector('body').style.backgroundColor = '#60b347';
    // change text width
    document.querySelector('.number').style.width = '30rem';

    if (score > highscore) {
      highscore = score;
      document.querySelector('.highscore').textContent = highscore;
    }

    // Guess too high
  } else if (guess > secretNumber) {
    if (score > 1) {
      document.querySelector('.message').textContent = 'Too high';
      document.querySelector('.message').style.color = 'red';
      score--;
      document.querySelector('.score').textContent = score;
    } else {
      document.querySelector('.message').textContent = 'You lost the game!';
      document.querySelector('.score').textContent = 0;
    }

    // Guess too low
  } else if (guess < secretNumber) {
    if (score > 1) {
      document.querySelector('.message').textContent = 'Too low';
      document.querySelector('.message').style.color = 'yellow';
      score--;
      document.querySelector('.score').textContent = score;
    } else {
      document.querySelector('.message').textContent = 'You lost the game!';
      document.querySelector('.score').textContent = 0;
    }
  }
});

// "Again" button reset game - really simple method of reloading from server i window.location.reload() so cache is released - so whole page! Would incur traffic and lose highscore value. Now do long version...
document.querySelector('.again').addEventListener('click', function () {
  console.log(document.querySelector('.again').value);
  // window.location.reload()

  score = 20;
  secretNumber = Math.trunc(Math.random() * 20 + 1);
  document.querySelector('.message').textContent = 'Start guessing...';
  document.querySelector('.score').textContent = '20';
  document.querySelector('.number').textContent = '?';
  document.querySelector('.guess').value = '';
  document.querySelector('body').style.backgroundColor = '#222';
  document.querySelector('.number').style.width = '15rem';
});
@import url('https://fonts.googleapis.com/css?family=Press+Start+2P&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}

html {
  font-size: 62.5%;
  box-sizing: border-box;
}

body {
  font-family: 'Press Start 2P', sans-serif;
  color: #eee;
  background-color: #222;
  /* background-color: #60b347; */
}

/* LAYOUT */
header {
  position: relative;
  height: 35vh;
  border-bottom: 7px solid #eee;
}

main {
  height: 65vh;
  color: #eee;
  display: flex;
  align-items: center;
  justify-content: space-around;
}

.left {
  width: 52rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.right {
  width: 52rem;
  font-size: 2rem;
}

/* ELEMENTS STYLE */
h1 {
  font-size: 4rem;
  text-align: center;
  position: absolute;
  width: 100%;
  top: 52%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.number {
  background: #eee;
  color: #333;
  font-size: 6rem;
  width: 15rem;
  padding: 3rem 0rem;
  text-align: center;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 50%);
}

.between {
  font-size: 1.4rem;
  position: absolute;
  top: 2rem;
  right: 2rem;
  color: greenyellow;
}

.again {
  position: absolute;
  top: 2rem;
  left: 2rem;
}

.guess {
  background: none;
  border: 4px solid #eee;
  font-family: inherit;
  color: inherit;
  font-size: 5rem;
  padding: 2.5rem;
  width: 25rem;
  text-align: center;
  display: block;
  margin-bottom: 3rem;
}

.btn {
  border: none;
  background-color: greenyellow;
  color: #222;
  font-size: 2rem;
  font-family: inherit;
  padding: 2rem 3rem;
  cursor: pointer;
}

.btn:hover {
  background-color: #ccc;
}

.message {
  margin-bottom: 8rem;
  height: 3rem;
}

.label-score {
  margin-bottom: 2rem;
}

.label-highscore {
  color: greenyellow;
}