:root {
  --ff: "Work Sans", sans-serif;

  --fw-thin: 100;
  --fw-extralight: 200;
  --fw-light: 300;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;
  --fw-black: 900;

  --clr-white: hsl(0, 100%, 100%);

  --clr-black-velvet: hsl(289, 37%, 14%);
  --clr-sweet-desire: hsl(277, 75%, 55%);
  --clr-purple-100: hsl(275, 100%, 97%);
  --clr-purple-600: hsl(292, 16%, 49%);
  --clr-purple-950: hsl(292, 42%, 14%);
}

html {
  font-size: 62.5%;
}

body {
  background-color: var(--clr-purple-100);
  font-family: var(--ff);
  font-size: 1.6rem;
  color: var(--clr-purple-600);
  background-image: url("./assets/images/background-pattern-mobile.svg");
  background-repeat: no-repeat;
  background-position: right top;
  background-size: contain;

  display: flex;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
  align-items: center;
}

header {
  display: flex;
  flex-direction: row;
  gap: 24px;
  justify-content: flex-start;
  align-items: center;
  margin-bottom: 24px;

  img {
    width: 24px;
    height: 24px;
  }

  h1 {
    color: var(--clr-purple-950);
    font-weight: var(--fw-bold);
    font-size: 3.2rem;
  }
}

article {
  max-width: 327px;
  width: 100%;
  background: var(--clr-white);
  padding: 24px;
  border-radius: 8px;
}

dl {
  display: flex;
  flex-direction: column;
  gap: 40px;

  dt::after {
    content: "";
    width: 100%;
    position: absolute;
    border: 1px solid var(--clr-purple-100);
    top: -20px;
  }

  dt:first-child::after {
    display: none;
  }
}

dt {
  cursor: pointer;
  display: flex;
  flex-direction: row;
  gap: 24px;
  align-items: center;
  font-size: 1.6rem;
  font-weight: var(--fw-semibold);
  color: var(--clr-black-velvet);
  line-height: 1.2;
  position: relative;

  &:is(:hover) {
    color: var(--clr-sweet-desire);
  }

  button {
    margin-left: auto;
    width: 24px;
    height: 24px;
    flex: 0 0 24px;
    border-radius: 50%;
    padding: 2px;
    background-repeat: no-repeat;
    background-position: right top;
    background-size: cover;
    border: none;
    outline: none;
  }

  button:is(:hover, :active) {
    outline: 1px dotted var(--clr-purple-950);
  }

  button[aria-expanded="false"] {
    background-image: url("./assets/images/icon-minus.svg");
  }

  button[aria-expanded="true"] {
    background-image: url("./assets/images/icon-plus.svg");
  }
}

dd {
  margin-top: -40px;
  font-size: 1.4rem;
  font-weight: var(--fw-normal);
  line-height: 1.5;

  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

dd.open {
  margin-top: -20px;
  max-height: 500px;
  opacity: 1;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media screen and (min-width: 650px) {
  body {
    background-image: url("./assets/images/background-pattern-desktop.svg");
  }

  article {
    max-width: 600px;
    padding: 40px;
  }

  header {
    margin-bottom: 32px;

    img {
      width: 40px;
      height: 40px;
    }

    h1 {
      font-size: 5.6rem;
    }
  }

  dl {
    gap: 48px;

    dt::after {
      top: -24px;
    }
  }

  dt {
    font-size: 1.8rem;

    button {
      margin-left: auto;
      width: 30px;
      height: 30px;
      flex: 0 0 30px;
    }
  }

  dd {
    margin-top: -48px;
    font-size: 1.6rem;
  }

  dd.open {
    margin-top: -24px;
  }
}