:root {
  font-size: 10px;

  --color-white: 0, 0%, 100%;
  --color-light: 270, 3%, 75%;
  --color-dark: 279, 6%, 55%;
  --color-darker: 278, 68%, 11%;
  --color-red-error: 0, 100%, 66%;
  --color-input-border-gradient: linear-gradient(
    hsl(249, 99%, 64%) to hsl(278, 94%, 30%)
  );

  --font-main: "Space Grotesk", monospace;
  --card-border-radius: 10px;
  --font-size-responsive-small: 2.1vw;
  --font-size-responsive-medium: 4.4vw;
}
body {
  font-size: 1.8rem;
  height: 100vh;
  width: 100vw;
  margin: 0;
  padding: 0;
  flex-direction: column;
}

/*-----------------*/
/* Utility Classes */
/*-----------------*/

.font-main {
  font-family: var(--font-main);
}

/* flex */

.flex {
  display: flex;
}

.flex-row {
  flex-direction: row;
}

.flex-column {
  flex-direction: column;
}

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

.flex-align-center {
  align-items: center;
}

.flex-justify-center {
  align-items: center;
}

/* colors */

.border-red-error {
  border-color: hsl(var(--color-red-error)) !important;
  border-style: solid !important;
  border-width: 2px !important;
}

.bg-dark-mode {
  background-color: #0000;
}

.bg-white {
  background-color: hsl(var(--color-white));
}

.bg-darker {
  background-color: hsl(var(--color-darker));
}

.text-light {
  color: hsl(var(--color-light));
}

.text-white {
  color: hsl(var(--color-white));
}

.text-darker {
  color: hsl(var(--color-darker));
}

.debug-border {
  border: 2px red solid;
}

.debug-borders,
.debug-borders * {
  border: 2px red solid;
}

.margin-between-vertical * {
  margin-bottom: var(--value, 0.5em);
}

.margin-between-vertical *:last-child {
  margin-bottom: none;
}

.margin-between-horizontal * {
  margin-right: var(--value, 0.5em);
}

.margin-between-horizontal *:last-child {
  margin-right: none;
}

/* ----------------- */

.bg-image {
  background-image: url("./images/bg-main-mobile.png");
  width: 100%;
  height: 40vh;
  background-size: cover;
  background-repeat: no-repeat;
}

.container {
  height: 100%;
  width: 100%;
  transition-duration: 500ms;
}

.form {
  transform: translateY(1.5em);
  width: 85%;
  max-width: 400px;
  display: grid;
  grid-template:
    "name     name"
    "number   number"
    "expiry-date cvc"
    "btn      btn";
  gap: 1.3em 0.5em;
}

.loading {
  opacity: 0.5;
  cursor: wait;
  pointer-events: none;
}

button {
  transition-duration: 200ms;
  transition-property: transform;
  font-size: 1.8rem;
  border: none;
  margin: 0 auto;
  width: 100%;
  padding: 0.75em;
  border-radius: 7px;
  cursor: pointer;
}

.end-screen {
  align-items: center;
  text-align: center;
  height: 45vh;
  max-height: 350px;

  width: 85%;
  max-width: 400px;
  justify-content: space-between;
}

.end-screen img {
  width: 25%;
}

.end-screen h1 {
  font-size: 3rem;
  letter-spacing: 0.2em;
}

.end-screen p {
  font-size: 2rem;
}

.end-screen div * {
  padding: 0.2em;
  margin: 0;
}

button:hover {
  transform: scale(1.05);
}

.form-element label {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 1rem;
  margin-bottom: 10px;
}

.form-element input::placeholder,
.form-element input {
  transition: border 100ms;
  font-size: 1.7rem;
  font-family: var(--font-main);
}

.form-element input::placeholder {
  color: rgba(109, 109, 109);
}

.form-element input {
  border-radius: 7px;
  border: solid 1px hsl(var(--color-light));
  box-sizing: border-box;
  padding: 0.7em 1em;
  width: 100%;
}

.form-warning-text {
  font-size: 1.2rem;
  color: hsl(var(--color-red-error));
  transition: 400ms;
  z-index: -1;
  position: absolute;
  left: 0;
  top: 50%;
  max-width: 100%;
}

.show-warning-text {
  top: 85% !important;
}

.form-element {
  width: 100%;
  margin: 0 auto;
  isolation: isolate;
  position: relative;
}

.credit-card {
  position: absolute;
  aspect-ratio: 1.8;
  width: 70%;
  max-width: 350px;
  margin: 0 auto;
  border-radius: 10px;
  box-shadow: -2px 10px 61px 1px rgba(0, 0, 0, 0.15);
  -webkit-box-shadow: -2px 10px 61px 1px rgba(0, 0, 0, 0.15);
  -moz-box-shadow: -2px 10px 61px 1px rgba(0, 0, 0, 0.15);
}

.credit-card-front {
  background: url("./images/bg-card-front.png");
  background-size: cover;
  background-position: center;
  top: 14vh;
  left: 0;
  right: 0;
  transform: translateX(-2em);
  z-index: 2;
  display: grid;
  grid-template:
    "logo logo" 2fr
    "number number" 1fr
    "name expiry-date" 1fr / auto;
}

.credit-card-front * {
  padding-left: 2rem;
}

.card-logo {
  grid-area: logo;
  width: 20%;
  align-self: flex-start;
  padding-top: 2.5rem;
}

.card-number-display {
  grid-area: number;
  letter-spacing: 0.15em;
  font-size: clamp(0px, 4vw, 2rem);
  align-self: flex-end;
}

.cardholder-name {
  font-size: clamp(0px, 2.2vw, 1.2rem);
  align-self: flex-start;
  margin-top: 0.1em;
  grid-area: name;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.expiry-date {
  align-self: flex-start;
  margin-top: 0.1em;
  font-size: clamp(0px, 2.2vw, 1.2rem);

  grid-area: expiry-date;
  justify-self: flex-end;
  padding: 0;
  letter-spacing: 0.2em;
  padding-right: 3rem;
}

.credit-card-back {
  top: calc(14vh - 80px);
  left: 0;
  right: 0;
  background: url("./images/bg-card-back.png");
  background-size: cover;
  background-position: center;
  transform: translateX(2em);

  z-index: 1;
}

.cvc {
  position: absolute;
  top: 37%;
  left: 80%;
  font-size: clamp(0px, 3vw, 1.5rem);
}

/* Chrome, Safari, Edge, Opera */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

/* Firefox */
input[type="number"] {
  -moz-appearance: textfield;
}

@media (min-width: 1250px) {
  :root {
    font-size: 11px;
  }
  .end-screen {
    height: 35vh;
  }
  body {
    flex-direction: row;
  }
  .bg-image {
    background-image: url("./images/bg-main-desktop.png");
    width: 50vw;
    height: 100vh;
    background-size: cover;
    background-repeat: no-repeat;
  }

  .credit-card {
    width: 70vw;
    max-width: 450px;
    margin: 0;
  }

  .credit-card-front * {
    padding-left: 3rem;
  }

  .card-logo {
    grid-area: logo;
    align-self: flex-start;
    padding-top: 2.5rem;
  }

  .card-number-display {
    grid-area: number;
    letter-spacing: 0.15em;
    font-size: 2.5rem;
    align-self: flex-end;
  }

  .cardholder-name {
    align-self: flex-start;
    margin-top: 0.1em;
    grid-area: name;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 1.2rem;
  }

  .expiry-date {
    align-self: flex-start;
    margin-top: 0.1em;

    grid-area: expiry-date;
    font-size: 1.2rem;
    justify-self: flex-end;
    padding: 0;
    letter-spacing: 0.2em;
    padding-right: 3rem;
  }

  .credit-card-front {
    background: url("./images/bg-card-front.png");
    background-size: cover;
    background-position: center;
    top: 20vh;
    transform: translateX(-2em);
    left: 10vw;
    z-index: 2;
  }

  .credit-card-back {
    top: 52vh;
    left: 12vw;
    background: url("./images/bg-card-back.png");
    background-size: cover;
    background-position: center;
    transform: translateX(2em);
    z-index: 1;
  }

  .cvc {
    position: absolute;
    top: 37%;
    left: 80%;
    font-size: 1.7rem;
  }
}