@import url("https://fonts.googleapis.com/css2?family=Titillium+Web:wght@400;600;700&display=swap");

:root {
  --primary-color: hsla(209, 94%, 60%, 1);
}

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

html {
  font-size: 62.5%;
}

body {
  background: #f0f0f0;
  font-size: 1.6rem;
  font-family: "Titillium Web", sans-serif;
  position: relative;
  min-height: 100vh;
}
ul {
  list-style-type: none;
}
button {
  cursor: pointer;
}

h1 {
  margin: 3rem 3rem 1rem 3rem;
  text-align: center;
  font-size: 4.8rem;
}
h1 + p {
  font-size: 2rem;
  text-align: center;
}
.link-repo {
  &:link,
  &:visited {
    color: inherit;
  }
  &:hover,
  &:active {
    color: hsl(209, 72%, 50%);
    /* text-decoration: underline; */
  }
}

.container {
  max-width: 144rem;
  margin: 0 auto;
  padding-left: 6.4rem;
  padding-right: 6.4rem;
}

/************************************/
.sentinal {
  height: 8rem;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  /* background-color: #f10c49; */
  opacity: 50%;
  z-index: -1;
}
.header {
  position: relative;
}
.tag-box {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  opacity: 0;
  min-height: 8rem;
  padding-top: 2.4rem;
  padding-bottom: 2.4rem;
  transition: 0.5s ease;
  will-change: background-color;

  &.sticky {
    position: fixed;
    top: 0;
    width: 100%;
    left: 0;
    background-color: var(--primary-color);
    z-index: 999;
    padding-left: 6.4rem;
    padding-right: 6.4rem;
  }
}

.tag {
  display: flex;
  align-items: center;
  background-color: #fff;
}
.btn-del {
  background-color: var(--primary-color);
  padding: 0 0.8rem;
  height: 100%;
  border: 0;
  font-size: 2.4rem;
  color: #fff;
}

/************************************/

.card-box {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(30rem, 1fr));
  column-gap: 2.4rem;
  row-gap: 5.4rem;
  transition: 0.3s ease;
}
@media (max-width: 430px) {
  h1 {
    font-size: 3.2rem;
  }
  .card-box {
    padding: 1.2rem;
  }
  .tag-box.sticky,
  .container {
    padding-left: 1.2rem;
    padding-right: 1.2rem;
  }
}
.card {
  box-shadow: 0 0 30px rgb(0, 0, 0, 0.2);
  border-radius: 0.5rem;
  overflow: hidden;
  color: #222;
  text-decoration: none;
}

.card-img {
  overflow: hidden;

  & img {
    display: block;
    width: 100%;
    transition: 0.3s ease;
  }
}

.card:hover .card-img img {
  scale: 1.05;
  transition: 0.5s ease;
  opacity: 0.8;
}
.card-content {
  padding: 2.4rem;
  /* display: flex;
  flex-direction: column; */
}
.challenge-name {
  &:link,
  &:visited {
    font-size: 1.8rem;
    text-decoration: none;
    color: inherit;
    transition: 0.5s ease;
    font-weight: 600;
    line-height: 1.3;
  }
  &:hover,
  &:active {
    color: hsl(209, 72%, 50%);
  }
}

.btn-box {
  margin-top: 2.4rem;
  /* margin-top: auto; */
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.btn-tag {
  &.highlight {
    color: red;
  }
  &:hover {
    background-color: #000;
    color: #fff;
  }
}

.btn-tag,
.tag span {
  padding: 0.5rem 0.8rem;
}
.btn-tag,
.tag {
  border-radius: 0.5rem;
  /* background-color: hsl(209, 72%, 50%, 0.3); */
  font-family: inherit;
  border: 1px solid rgb(0, 0, 0, 0.2);
  overflow: hidden;
  transition: 0.5s ease;
}