body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  background: hsl(270, 3%, 87%);
  color: hsl(278, 68%, 11%);
  overflow-x: hidden;
}

.container {
  display: grid;
  grid-template-columns: 25% 75%;
  min-height: 100vh;
  max-width: 1440px;
  margin: 0 auto;
}

.left-column {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  overflow: visible;
}

.background-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.cards {
  position: relative;
  width: 400px;
  height: 300px;
  margin-right: -120px; /* This will make the cards overlap into the right column */
}

.card-front {
  position: absolute;
  top: -70px;
  left: 2.5rem;
  width: 370px;
  z-index: 2;
}

.card-logo {
  width: 50px;
  height: auto;
  margin-bottom: 3rem;
}

.card-front-info {
  position: absolute;
  top: -18px; 
  left: 3.5rem;
  width: 350px;
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}

.card-number {
  font-size: 22px;
  color: #fff;
  letter-spacing: 4px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 500;
}

.card-name,
.card-expiry {
  font-size: 14px;
  color: #fff;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 500;
  letter-spacing: 1px;
}

.card-expiry {
  position: absolute;
  right: 2px;
  bottom: 0;
}

.card-back {
  position: absolute;
  top: 160px;
  left: 100px;
  width: 380px;
  z-index: 2;
}

.card-back-info {
  position: absolute;
  top: 250px;
  left: 400px;
  z-index: 3;
  pointer-events: none;
}

.card-cvc {
  font-size: 14px;
  color: #fff;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 500;
  letter-spacing: 1px;
}

.right-column {
  display: flex;
  align-items: center;
  justify-content: center;
  background: hsl(0, 100%, 100%);
}

.card-form {
  width: 480px;
  padding: 2rem;
  background: hsl(0, 100%, 100%);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-left: 3rem;
}

.card-form label {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 0.1rem;
  color: hsl(278, 68%, 11%);
  letter-spacing: 1px;
  margin-bottom: 0px;
}

.card-form input {
  width: 100%;
  padding: 0.75rem 0.15rem 0.75rem 0.5rem;
  font-size: 18px;
  font-family: inherit;
  font-weight: 500;
  border: 1px solid hsl(270, 3%, 87%);
  border-radius: 8px;
  background: hsl(0, 100%, 100%);
  color: hsl(278, 68%, 11%);
  outline: none;
  transition: border 0.2s;
  margin-bottom: 1px;
}

.card-form input:focus {
  border: 1.5px solid;
  border-image: linear-gradient(90deg, hsl(249, 99%, 64%), hsl(278, 94%, 30%)) 1;
}

.form-row {
  display: flex;
  gap: 1.5rem;
}

.form-row > div {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Error styles for later JS validation */
.card-form input.error {
  border-color: hsl(0, 100%, 66%);
}

.complete-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 2rem;
  background: hsl(0, 100%, 100%);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.complete-icon {
  width: 60px;
  margin-bottom: 1rem;
}

.complete-state h2 {
  font-size: 2rem;
  color: hsl(278, 68%, 11%);
  margin: 0;
}

.complete-state p {
  font-size: 18px;
  color: hsl(212, 12%, 71%);
  margin: 0;
}

.continue-btn {
  padding: 1rem 2rem;
  font-size: 18px;
  font-family: inherit;
  font-weight: 500;
  background: linear-gradient(90deg, hsl(278, 94%, 20%));
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 1rem;
}
.confirm-btn {
  padding: 1rem;
  font-size: 18px;
  font-family: inherit;
  font-weight: 500;
  background: linear-gradient(90deg, hsl(278, 94%, 20%));
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.confirm-btn:enabled {
  opacity: 1;
  cursor: pointer;
}

.error-message {
  color: hsl(0, 100%, 66%);
  font-size: 12px;
  margin-top: 0px;
  margin-bottom: 0px;
  display: block;
  min-height: 18px;
}

@media (max-width: 900px) {
  .container {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
  }

  .left-column,
  .right-column {
    width: 100%;
    height: auto;
  }

  .left-column {
    justify-content: flex-start;
    padding-top: 2rem;
    padding-bottom: 1rem;
    position: relative;
    height: 280px;
  }

  .background-img {
    height: 100%;
    width: 100%;
    object-fit: cover;
  }

  .cards {
    width: 350px;
    height: 250px;
    margin: 0 auto;
    position: relative;
  }

  .card-logo {
    width: 40px;
    height: auto;
    margin: 0;
    position: absolute;
    top: -4rem; 
    left: 0.3rem;
    z-index: 4;
  }

  .card-front {
    width: 330px;
    position: absolute;
    bottom: 0;
    left: 0;
    z-index: 2;
    top: 120px;
  }

  .card-front-info {
    position: absolute;
    top: 230px;
    left: 1.5rem;
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .card-number {
    font-size: 18px;
  }

  .card-name,
  .card-expiry {
    font-size: 12px;
  }

  .card-back {
    width: 320px;
    position: absolute;
    top: -10px;
    left: 40px;
    right: 0;
    z-index: 1;
  }

  .card-back-info {
    top: 68px;
    left: 280px;
    font-size: 12px;
    position: absolute;
    z-index: 3;
  }

  .right-column {
    display: flex;
    justify-content: center;
    padding: 1rem;
    margin-top: 0.1rem;
    background-color: hsl(0, 100%, 100%);
  }

  .card-form {
    width: 100%;
    max-width: 360px;
    padding: 1rem;
    margin-top: 1.5rem;
    background-color: hsl(0, 100%, 100%);
    z-index: 5;
    margin-left: auto;
    margin-right: auto;
    box-sizing: border-box;
    width: calc(100% - 2rem);
  }

  .form-row {
    flex-direction: column;
    gap: 0.75rem;
  }
}