:root {
  /* Colors */
  --white: #fff;
  --grey: #949494;
  --blue-800: #242742;
  --blue-700: #36384d;
  --red: #ff6155;
  --red-100: #ffe7e6;

  --gradient-left: #ff6a3a;
  --gradient-right: #ff527b;

  /* Typography - Font Family */
  --font-family: "Roboto", sans-serif;

  /* Text Preset 1 */
  --tp-1-size: 5.6rem;
  --tp-1-weight: 700;
  --tp-1-line-height: 1;

  /* Text Preset 1 Mobile */
  --tp-1m-size: 4rem;
  --tp-1m-weight: 700;
  --tp-1m-line-height: 1;

  /* Text Preset 2 Bold */
  --tp-2b-size: 1.6rem;
  --tp-2b-weight: 700;
  --tp-2b-line-height: 1.5;

  /* Text Preset 2 Regular */
  --tp-2r-size: 1.6rem;
  --tp-2r-weight: 400;
  --tp-2r-line-height: 1.5;

  /* Text Preset 3 */
  --tp-3-size: 1.2rem;
  --tp-3-weight: 700;
  --tp-3-line-height: 1.5;

  /* Spacing */
  --spacing-1300: 10.4rem;
  --spacing-900: 7.2rem;
  --spacing-800: 6.4rem;
  --spacing-600: 4.8rem;
  --spacing-500: 4rem;
  --spacing-400: 3.2rem;
  --spacing-300: 2.4rem;
  --spacing-200: 1.6rem;
  --spacing-100: 0.8rem;
}

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

html {
  /* font-size: 10px; */
  /* 10px / 16px = 0.625 = 62.5% */
  /* Percentage of user's browser font-size setting */
  font-size: 62.5%;
}

body {
  font-family: var(--font-family);
  background-color: var(--blue-700);
  min-height: 100vh;
  position: relative;

  display: flex;
  align-items: center;
  justify-content: center;
}

.newsletter-container {
  width: 100%;
  max-width: 90.4rem;
  background-color: var(--white);
  border-radius: 3.6rem;
  padding: 3.2rem;
  gap: 6.4rem;

  display: flex;
}

.img-container {
  width: 100%;
  max-width: 40rem;
}

.newsletter-img {
  width: 100%;
  height: 100%;
  border-radius: 1.6rem;
}

.detail-container {
  color: var(--blue-800);
  width: 100%;
  max-width: 37.6rem;
  padding: 7rem 0;
  font-size: var(--tp-2r-size);
  font-weight: var(--tp-2r-weight);
  line-height: var(--tp-2r-line-height);
}

.newsletter-title {
  font-size: var(--tp-1-size);
  font-weight: var(--tp-1-weight);
  line-height: var(--tp-1-line-height);
  margin-bottom: 3.2rem;
}

.newsletter-info {
  margin-bottom: 3.2rem;
}

.newsletter-list {
  list-style: none;
  margin-bottom: 3.2rem;
}

.newsletter-list li {
  position: relative;
  padding-left: 3.5rem;
  margin-bottom: 0.5rem;
}

.newsletter-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);

  width: 2.1rem;
  height: 2.1rem;

  background-image: url("images/icon-list.svg");

  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.form-label {
  font-size: var(--tp-3-size);
  font-weight: var(--tp-3-weight);
  line-height: var(--tp-3-line-height);
  margin-bottom: 1rem;

  display: flex;
  justify-content: space-between;
}

.form-input {
  width: 100%;
  background-color: var(--white);
  border: 0.1rem solid var(--grey);
  border-radius: 0.8rem;
  padding: 1.6rem 2.4rem;
  margin-bottom: 1.5rem;
}

.form-input::placeholder {
  color: var(--grey);
}

.form-input:focus {
  outline: none;
  border-color: var(--blue-800);
  color: var(--blue-800);
}

.open-modal,
.close-modal {
  font-size: var(--tp-2b-size);
  font-weight: var(--tp-2b-weight);
  line-height: var(--tp-2b-line-height);
  width: 100%;
  color: var(--white);
  background-color: var(--blue-800);
  border: none;
  border-radius: 0.8rem;
  cursor: pointer;
  padding: 1.6rem 2.4rem;
}

.open-modal:hover,
.open-modal:active,
.close-modal:hover,
.close-modal:active {
  background: linear-gradient(
    to right,
    var(--gradient-left),
    var(--gradient-right)
  );
  box-shadow: 0 1.6rem 3.2rem 0 rgba(255, 97, 85, 0.5);
}

/* Modal Window */
.modal {
  color: var(--blue-800);
  background-color: var(--white);
  border-radius: 3.6rem;
  width: 100%;
  max-width: 50.4rem;
  padding: 6.4rem;

  flex-direction: column;
  gap: 3.2rem;

  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
}

.success-icon {
  width: 100%;
  max-width: 6.4rem;
}

.modal-title {
  font-size: var(--tp-1-size);
  font-weight: var(--tp-1-weight);
  line-height: var(--tp-1-line-height);
}

.modal-info {
  font-size: var(--tp-2r-size);
  font-weight: var(--tp-2r-weight);
  line-height: var(--tp-2r-line-height);
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--blue-700);
  z-index: 5;
}

.modal,
.overlay {
  display: none;
}

.modal.active {
  display: flex;
}

.overlay.active {
  display: block;
}

/* Error Message */
.form-input.error {
  border-color: var(--red);
  background-color: var(--red-100);
  color: var(--red);
}

.form-input.error::placeholder {
  color: var(--red);
}

.form-error {
  display: none;
  color: var(--red);
}

.form-error.active {
  display: block;
}

/* rem and em do NOT depend on html font-size in media queries! Instead, 1rem = 1em = 16px */
/* Tablet = 768px = 48em */
/* Mobile = 384px = 24em */

/******************************************/
/* BELOW 768px (Tablet) */
/******************************************/
@media (max-width: 48em) {
  body {
    padding: 2.4rem;
  }

  .newsletter-container {
    width: 100%;
    max-width: 60.8rem;
    flex-direction: column-reverse;
    gap: 4rem;
  }

  .img-container {
    width: 100%;
    max-width: 52.8rem;
  }

  .newsletter-img {
    width: 100%;
    height: 100%;
  }

  .detail-container {
    width: 100%;
    max-width: 52.8rem;
    padding: 0;
  }

  .newsletter-list {
    margin-bottom: 2.4rem;
  }
}

/******************************************/
/* BELOW 384px (Mobile) */
/******************************************/
@media (max-width: 24em) {
  body {
    padding: 0;
  }

  .newsletter-container {
    width: 100%;
    max-width: 37.5rem;
    border-radius: 0;
    padding: 0rem;
  }

  .img-container {
    width: 100%;
    max-width: 37.5rem;
  }

  .newsletter-img {
    width: 100%;
    height: 100%;
    border-radius: 0;
  }

  .detail-container {
    width: 100%;
    max-width: 52.8rem;
    padding: 0 2.4rem 4.4rem 2.4rem;
  }

  .newsletter-title,
  .modal-title {
    font-size: var(--tp-1m-size);
    font-weight: var(--tp-1m-weight);
    line-height: var(--tp-1m-line-height);
  }

  .newsletter-list {
    margin-bottom: 4rem;
  }

  .modal {
    width: 100%;
    max-width: 37.5rem;
    height: 100%;
    border-radius: 0;
    padding: 11.1rem 2.4rem 7rem 2.4rem;
  }

  .close-modal {
    margin-top: auto;
  }

  .overlay {
    display: none;
  }
}