@import url("https://fonts.googleapis.com/css2?family=Poppins&family=Roboto&display=swap");

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

:root {
  --fontFam: "Poppins", sans-serif;
  --color1: #000;
  --color2: #333;
  --color3: #666;
  --color4: #ddd;
  --color5: #fff;
  --bgColor: linear-gradient(to right, #99a3a3, #e9e9e9);
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-image: var(--bgColor);
  font-family: var(--fontFam);
  font-size: 18px;
  letter-spacing: 1px;
  height: 100vh;
}

.container {
  margin-bottom: 30px;
}

h1 {
  font-size: 34px;
  color: var(--color2);
  padding-bottom: 40px;
}

.box-container {
  display: flex;
  flex-direction: row;
}

.box,
.btn {
  width: 34px;
  color: var(--color1);
  border: 1px solid var(--color2);
  text-align: center;
  padding: 4px;
  margin: 4px;
  border-radius: 4px;
  cursor: pointer;
}

.btn {
  width: auto;
  font-family: var(--fontFam);
  font-size: 14px;
  letter-spacing: 1px;
  background-color: transparent;
  padding: 6px 10px;
  border: 1px solid var(--color1);
  border-radius: 4px;
  margin: 20px 0 0 0;
}

.box:hover,
.btn:hover {
  background-color: var(--color3);
  color: var(--color4);
  border: 1px solid var(--color3);
}

.box:first-child {
  margin-left: 0;
}

.highlight-box {
  background-color: var(--color2);
  color: var(--color5);
  border-color: var(--color2);
}

.highlight-result {
  background-color: var(--color3);
  color: var(--color4);
  padding: 4px 8px;
  border-radius: 4px;
}

.displayBoxNum,
.isBoxSelected {
  padding: 20px 0 0 0;
}

@media only screen and (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .container {
    margin: 0 20px;
  }

  .box {
    width: 28px;
  }

  .box:first-child {
    margin-left: 4px;
  }

  .box-container {
    flex-wrap: wrap;
  }
}

.copy {
  position: fixed;
  bottom: 0;
  text-align: center;
  width: 100%;
  background-image: var(--bgColor);
  color: var(--color2);
  font-size: 12px;
  letter-spacing: 1.2px;
  padding: 12px 0;
}

.copy a {
  color: var(--color2);
  text-decoration: underline;
  text-decoration-color: var(--color2);
  text-underline-offset: 5px;
}

.copy a:hover {
  color: var(--color2);
  text-decoration: none;
}

@media only screen and (max-width: 370px) {

  .copy {
    line-height: 1.5;
  }

  .copy a {
    text-underline-offset: 2px;
  }

  .copy2 {
    display: block;
  }
}