@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300..700&display=swap');

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

body {
  /* neutral */
  --White: hsl(0, 0%, 100%);
  --Very-dark-violet: hsl(278, 68%, 11%);
  --Dark-grayish-violet: hsl(279, 6%, 55%);
  --Light-grayish-violet: hsl(270, 3%, 87%);
  --Input-placeholder: hsla(279, 6%, 55%, 0.7);

  /* primary */
  --error: hsl(0, 100%, 66%);
  --active-input-border: linear-gradient(
    0deg,
    hsl(249, 99%, 64%),
    hsl(278, 94%, 30%)
  );

  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.125rem;
  font-weight: 500;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

main {
  text-transform: uppercase;

  @media (min-width: 40em) {
    min-height: 100vh;
    display: flex;
  }
}

.d-none {
  display: none !important;
}

.card_header {
  background: url('./assets/images/bg-main-mobile.png') no-repeat center/cover;
  max-height: 11.25em;

  @media (min-width: 40em) {
    background: url('./assets/images/bg-main-desktop.png') no-repeat
      center/cover;
    max-height: none;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
  }

  @media (min-width: 60em) {
    gap: 1em;
  }
}

.card_header--back,
.card_header--front {
  margin-inline: auto;
  padding: 1em 0;
  width: 18em;
  height: 8em;
  position: relative;
  scale: 0.85;

  & > * {
    position: absolute;
  }

  & > img {
    width: 100%;
    height: 100%;
  }
}

.card_header--back {
  translate: 10% 0;

  & > .card-img-cvc {
    color: white;
    font-size: 1rem;
    text-align: right;
    margin: 0.85em 0 0 0;
    top: 4em;
    right: 3em;

    @media (min-width: 60em) {
      margin: 0;
      top: 3.7em;
    }
  }

  @media (min-width: 40em) {
    order: 1;
    translate: 0 0;
  }

  @media (min-width: 60em) {
    border-radius: 0.5em;
    box-shadow: 0px 5px 30px 0px rgba(142, 133, 147, 0.3);
    order: 1;
    translate: 50% 0;
    padding: 0;
  }
}

.card_header--front {
  letter-spacing: 3px;
  translate: -10% -50%;

  & > .card-logo {
    margin: 1em;
    width: 3em;
    max-height: 1.5em;
    aspect-ratio: 1/1;
  }

  & > .card-img-number {
    color: var(--White);
    font-size: 1.125rem;
    font-weight: 500;
    margin: 0 2rem 0 1rem;
    top: 60%;
    left: 0;
    right: 0;
  }

  & > .card-img-name {
    color: var(--White);
    font: inherit;
    font-size: 0.7rem;
    margin: 0 0 0.5rem 1rem;
    left: 0;
    bottom: 0;
  }

  & > .card-img-date {
    color: var(--White);
    font: inherit;
    font-size: 0.7rem;
    margin: 0 2rem 0.5rem 0;
    right: 0;
    bottom: 0;
  }

  @media (min-width: 40em) {
    translate: 0 0;
  }

  @media (min-width: 60em) {
    border-radius: 0.5em;
    box-shadow: 0px 5px 30px 0px rgba(142, 133, 147, 0.3);
    padding: 0;
    translate: 25% 0;
  }
}

.card_form {
  margin: 3em auto;
  padding: 1em;
  max-width: 25em;

  & > .form-control + .form-control {
    margin-top: 0.5em;
  }

  @media (min-width: 40em) {
    margin: auto;
  }
}

.form-control {
  & > label,
  & > span {
    font: inherit;
    font-size: 0.7rem;
  }

  & > .validation {
    color: var(--error);
    text-transform: initial;
  }

  & > input {
    border: 1px solid var(--Light-grayish-violet);
    border-radius: 0.5em;
    font: inherit;
    font-size: 0.7rem;
    margin-top: 0.3em;
    padding: 1em;
    width: 100%;
    display: block;

    &::placeholder {
      color: var(--Input-placeholder);
    }

    &:focus-visible {
      border-image: var(--active-input-border);
    }
  }
}

.card_form--date-cvc {
  margin-top: 0.5em;
  gap: 1em;
  display: flex;

  & > .validation {
    color: var(--error);
    text-transform: initial;
  }
}

.card-date-validation {
  max-width: 7em;

  & > .validation {
    color: var(--error);
    text-transform: initial;
    font: inherit;
    font-size: 0.7rem;
  }
}

.card-date {
  gap: 0.5em;
  display: flex;
}

.card-cvc {
  flex-grow: 1;
}

.btn-primary {
  border: none;
  border-radius: 0.5em;
  background: var(--Very-dark-violet);
  color: var(--White);
  text-transform: capitalize;
  font: inherit;
  font-size: 1rem;
  margin-top: 1em;
  padding: 1em;
  width: 100%;
  cursor: pointer;

  @media (min-width: 40em) {
    font-size: 0.75rem;
  }
}