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

:root {
  --mathPrimary: #FFCE00;
  --mathSecondary: #FE4880;
  --geographyPrimary: #19FFEB;
  --geographySecondary: #CC14B7;
  --frenchPrimary: #CC14B7;
  --frenchSecondary: #FFCE00;
  --dark: #212121;
  --light: #F3F3F3;
}

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

body {
  font-family: "Montserrat", sans-serif;
  width: 100%;
  min-height: 100vh;
}

.title-div {
  background-color: #30336b;
  color: #ffffff;
  font-size: 150%;
  position: relative;
  padding: 40px 15px;
  text-align: center;
}

.title-div h1 {
  margin: 0;
}

.title-div p {
  margin: 30px 0 20px 0;
}

.container {
  margin: 30px auto;
  width: 350px;
}

.card {
  margin: 30px auto 0;
  width: 400px;
  height: 550px;
  perspective: 1000px;
}

.card__inner {
  width: 100%;
  height: 100%;
  transition: transform 1s;
  transform-style: preserve-3d;
  cursor: pointer;
  position: relative;
}

.card__inner.is-flipped {
  transform: rotateY(180deg);
}

.card__face {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  overflow: hidden;
  border-radius: 16px;
  box-shadow: 0px 3px 18px 3px rgba(0, 0, 0, 0.2);
}

.card__face--front {
  display: flex;
  align-items: center;
  justify-content: center;
}

#math-color-front {
  background-image: linear-gradient(to bottom right, var(--mathPrimary), var(--mathSecondary));
}

#geog-color-front {
  background-image: linear-gradient(to bottom right, var(--geographyPrimary), var(--geographySecondary));
}

#french-color-front {
  background-image: linear-gradient(to bottom right, var(--frenchPrimary), var(--frenchSecondary));
}

.card__face--front h2 {
  color: #FFF;
  font-size: 32px;
}

.card__face--back {
  background-color: var(--light);
  transform: rotateY(180deg);
}

.card__body {
  align-items: center;
}

.next-card {
  cursor: pointer;
  color: var(--light);
  border: 0;
  margin: 180px auto;
  display: block;
  padding: 12px 20px;
  font-size: 16px;
}

#math-next-card {
  background-image: linear-gradient(to bottom left, var(--mathPrimary) 10%, var(--mathSecondary) 115%);
}

#geog-next-card {
  background-image: linear-gradient(to bottom left, var(--geographyPrimary) 10%, var(--geographySecondary) 115%);
}

#french-next-card {
  background-image: linear-gradient(to bottom left, var(--frenchPrimary) 10%, var(--frenchSecondary) 115%);
}

.card__content {
  width: 100%;
  height: 100%;
}

.card__header {
  position: relative;
  padding: 30px 30px 40px;
}

.card__header:after {
  content: '';
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  border-radius: 0px 0px 50% 0px;
}

#math-color-back {
  background-image: linear-gradient(to bottom left, var(--mathPrimary) 10%, var(--mathSecondary) 115%);
}

#geog-color-back {
  background-image: linear-gradient(to bottom left, var(--geographyPrimary) 10%, var(--geographySecondary) 115%);
}

#french-color-back {
  background-image: linear-gradient(to bottom left, var(--frenchPrimary) 10%, var(--frenchSecondary) 115%);
}

.card__header h2 {
  color: #FFF;
  font-size: 32px;
  font-weight: 900;
  text-transform: uppercase;
  text-align: center;
}

.card__body {
  padding: 30px;
}

.card__body h3 {
  color: var(--dark);
  font-size: 40px;
  font-weight: 600;
  margin-top: 30px;
  margin-bottom: 15px;
  text-align: center;
}

.card__body p {
  color: var(--dark);
  font-size: 18px;
  line-height: 1.4;
}

.button {
  cursor: pointer;
  background-color: #FE4880;
  box-shadow: var(--box-shadow);
  color: #ffffff;
  border: 0;
  display: block;
  font-size: 16px;
  margin: 10px 0 30px;
  padding: 10px;
  width: 100%;
}

.buttons-div {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
}

.button:focus {
  outline: 0;
}