@import url('https://fonts.googleapis.com/css2?family=Bai+Jamjuree:wght@400;600&display=swap');

:root {
  --StrongCyan: hsl(171, 66%, 44%);
  --LightBlue: hsl(233, 100%, 69%);
  --DarkGrayishBlue: hsl(210, 10%, 33%);
  --GrayishBlue: hsl(201, 11%, 66%);
}

* {
  font-family: 'Bai Jamjuree', sans-serif;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

header {
  min-height: 100vh;
  background-image: url(images/bg-header-mobile.png);
  background-repeat: no-repeat;
  background-position: top center;
  background-size: cover;
  text-align: center;
}
.logo {
  padding: 100px 0;
}
.header-description {
  width: 80%;
  margin: 0 auto;
}
.header-description > h1 {
  color: var(--DarkGrayishBlue);
  margin: 10px 0;
  margin-top: -20px;
}
.header-description > p {
  color: var(--GrayishBlue);
  margin: 15px 0;
}
.cta-btns {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 30px 0;
}
.btn {
  width: 80%;
  max-width: 200px;
  margin: 10px 0;
  padding: 10px;
  border: none;
  outline: none;
  border-radius: 50px;
  font-size: 18px;
  font-weight: 600;
  color: white;

  cursor: pointer;
}
.ios-btn {
  background-color: var(--StrongCyan);
  box-shadow: 0px 3px hsl(171, 65%, 37%);
}
.mac-btn {
  background-color: var(--LightBlue);
  box-shadow: 0px 3px hsl(233, 65%, 59%);
}

section {
  width: 80%;
  margin: 60px auto;
  text-align: center;
}

.feature-top {
  margin: 20px 0;
}
.feature-top > h2 {
  color: var(--DarkGrayishBlue);
  margin: 10px 0;
}
.feature-top > p {
  color: var(--GrayishBlue);
  margin: 15px 0;
}

.feature-img > img {
  width: 100%;
  margin: 20px 0;
}

.feature {
  margin: 30px 0;
}
.feature > h3 {
  color: var(--DarkGrayishBlue);
  margin: 10px 0;
  font-size: 20px;
}
.feature > p {
  color: var(--GrayishBlue);
}

.details {
  margin: 50px 0;
}
.detail {
  margin: 50px 0;
}

.detail > h3 {
  margin: 5px 0;
  color: var(--DarkGrayishBlue);
}
.detail > p {
  color: var(--GrayishBlue);
}

.sponsors {
  margin: 120px auto;
}

.sponsor {
  margin: 50px 0;
}

footer {
  background-color: #f5f6f8;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.footer-logo > img {
  width: 60px;
  margin-top: 40px;
  margin-bottom: 20px;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.footer-nav > a {
  margin: 15px 0;
  text-decoration: none;
}
.social-icons {
  margin: 15px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.social-icons > a {
  text-decoration: none;
  margin-left: 10px;
  margin-right: 10px;
}

.attribution-section {
  background-color: #f5f6f8;
}

.attribution {
  font-size: 11px;
  text-align: center;
}
.attribution a {
  color: hsl(228, 45%, 44%);
}

@media screen and (min-width: 999px) {
  header {
    background-image: url(images/bg-header-desktop.png);
  }
  section {
    width: 90%;
  }
  .cta-btns {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-evenly;
    width: 80%;
    margin: 50px auto;
  }
  .feature-section {
    display: grid;
    grid-template-areas:
      'f-top f-top'
      'img feature';
    align-items: center;
    justify-content: space-between;
    column-gap: 30px;
  }
  .feature-top {
    grid-area: f-top;
  }
  .feature-img {
    grid-area: img;
  }
  .features {
    grid-area: feature;
    text-align: left;
  }
  .details {
    display: grid;
    grid-template-areas: 'd1 d2 d3';
    column-gap: 20px;
  }
  .detail > img {
    height: 40px;
    width: 50px;
    margin: 30px 0;
  }
  .sponsors {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .feature-top {
    width: 60%;
    margin: 0 auto;
  }
  footer {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-around;
    padding: 30px 0;
  }
  .footer-logo > img {
    margin: 0;
  }
  .footer-nav {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .footer-nav > a {
    margin: 10px;
  }
  .social-icons {
    margin: 0;
  }
}