@import url('https://fonts.googleapis.com/css2?family=Karla:wght@400;700&display=swap');

:root {
  --cyan: hsl(179, 62%, 43%);
  --cyan-opaque: hsla(179, 62%, 43%, 85%);
  --bright-yellow: hsl(71, 73%, 54%);
  --white: hsl(255, 100%, 100%);

  --light-gray: hsl(204, 43%, 93%);
  --grayish-blue: hsl(218, 22%, 67%);
  --light-blue: hsl(204, 43%, 93%);
}
* {
  font-family: Karla, sans-serif;
}
html {
  font-size: 62.5%;
}
body {
  font-size: 1.4rem;
  display: flex;
  flex-direction: column;
  min-block-size: 100vh;
  margin: 0;
  background-color: var(--light-blue);
}
main {
  flex-grow: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}
article {
  display: flex;
  flex-direction: column;
  margin-inline: 3.2rem;
  max-inline-size: 40rem;
  box-shadow: 0 1.5rem 3rem hsla(212, 100%, 33%, 15%);
}
article section,
article aside {
  padding: 2.4rem;
}
article > :first-child {
  border-radius: 0.5rem 0.5rem 0 0;
}
article > :last-child {
  border-radius: 0 0 0.5rem 0.5rem;
}
article h1 {
  font-size: 1.8rem;
  margin-block: 0 2.5rem;
}
article h2 {
  font-size: 1.5rem;
  margin-block-end: 2rem;
}

.our-community {
  background-color: var(--white);
  color: var(--grayish-blue);
}
.our-community p {
  line-height: 2em;
}
.our-community h1 {
  font-size: 2rem;
  color: var(--cyan);
}
.our-community h2 {
  color: var(--bright-yellow);
}
.our-community p {
  margin-block-end: 0.5rem;
}

.subscription {
  color: var(--white);
  background-color: var(--cyan);
  font-size: 1.6rem;
}
.subscription h1 {
  margin-block-end: 2rem;
}
.subscription .price {
  margin-block-end: 0;
}
.subscription .price strong {
  font-weight: 700;
  font-size: 3.2rem;
  vertical-align: middle;
}
.subscription .price span {
  opacity: 0.5;
  font-size: 1.5rem;
}
.subscription .price + p {
  margin-block: 1rem 3rem;
}
.subscription button {
  cursor: pointer;
  font-weight: 700;
  font-size: 1.6rem;
  display: block;
  border: 0;
  inline-size: 100%;
  border-radius: 0.5rem;
  padding-block: 1rem;
  color: var(--white);
  background-color: var(--bright-yellow);
  box-shadow: 0 1rem 1rem rgba(0, 0, 0, 0.1);
}

.why-us {
  background-color: var(--cyan-opaque);
}
.why-us {
  color: var(--white);
}
.why-us ul {
  opacity: 0.75;
  padding: 0;
  margin: 0;
}
.why-us li {
  margin: 0;
  display: block;
  margin-block-end: 0.4rem;
}
.why-us li:last-child {
  margin: 0;
}
footer {
  margin: 1rem;
  color: var(--cyan);
  font-size: 1.1rem;
  text-align: center;
}
footer a {
  color: var(--bright-yellow);
}

/* 768px = 48em */
@media only screen and (min-width: 48em) {
  article {
    flex-direction: row;
    flex-wrap: wrap;
    max-inline-size: 63.5rem;
  }
  article > * {
    box-sizing: border-box;
  }

  section.our-community {
    flex-basis: 100%;
    border-radius: 0.5rem 0.5rem 0 0;
  }
  section.subscription {
    border-radius: 0 0 0 0.5rem;
    flex-basis: 50%;
  }
  aside.why-us {
    border-radius: 0 0 0.5rem 0;
    flex-basis: 50%;
  }
}