:root {
  /* color */
  --cyan-600: #4d96a9;
  --cyan-300: #8fe3f9;
  --purple-600: #855fb1;
  --purple-300: #d9b8ff;
  --slate-900: #28283d;
  --slate-600: #87879d;
  --slate-300: #d1d1df;
  --white: #fafafa;

  /* space */
  --space-1400: 112px;
  --space-1000: 80px;
  --space-900: 72px;
  --space-800: 64px;
  --space-700: 56px;
  --space-500: 40px;
  --space-400: 32px;
  --space-300: 24px;
  --space-200: 16px;
  --space-100: 8px;
  --space-50: 4px;
}

.text-preset-1 {
  font-weight: 900;
  font-size: 40px;
  line-height: 110%;
}

.text-preset-2 {
  font-weight: 900;
  font-size: 32px;
  line-height: 110%;
}

.text-preset-3 {
  font-weight: 900;
  font-size: 12px;
  line-height: 110%;
  letter-spacing: 4px;
}

.text-preset-4 {
  font-weight: 500;
  font-size: 16px;
  line-height: 150%;
}
.text-preset-5 {
  font-weight: 900;
  font-size: 16px;
  line-height: 150%;
}

.btn-blue {
  background-color: var(--cyan-600);
  color: var(--white);
  padding: 16px 40px;
  border-radius: 29px;
  border: none;
}

.btn-blue:hover {
  background-color: var(--cyan-300);
}

.btn-purple {
  background-color: var(--purple-600);
  color: var(--white);
  padding: 16px 40px;
  margin: 0;
  border-radius: 29px;
  border: none;
}

.btn-purple:hover {
  background-color: var(--purple-300);
}

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

body {
  font-family: "Red Hat Display";
}

main {
  display: flex;
  flex-direction: column;
}

.logo {
  margin-top: 48px;
  align-self: center;
}

header {
  text-align: center;
  overflow: hidden;
}

.faces-left,
.faces-right {
  display: none;
}

.people {
  width: 100%;
  height: 160px;
  background-image: url("./assets/tablet/image-hero.png");
  background-size: auto 100%;
  background-position: center;
  background-repeat: no-repeat;
  margin-top: var(--space-800);
}

.hero-section {
  padding: var(--space-400);
}

.hero-section > * + * {
  margin-top: var(--space-300);
}

.hero-section p {
  color: var(--slate-600);
}

.btn-container {
  margin-top: var(--space-200);
}

section {
  margin-bottom: var(--space-800);
  padding: var(--space-400);
  padding-bottom: var(--space-500);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-800);
}

.step-number {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 56px;
}

.step-line {
  width: 1px;
  height: 84px;
  background-color: var(--slate-300);
}

.step-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1px solid var(--slate-300);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate-600);
  font-weight: 900;
  background-color: var(--white);
}

.images {
  width: 100%;
  display: grid;
  gap: var(--space-200);
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.images img {
  width: 100%;
  object-fit: cover;
  border-radius: 8px;
}

.descriptions {
  text-align: center;
}

.descriptions .small-text {
  margin-bottom: var(--space-200);
  color: var(--cyan-600);
  text-transform: uppercase;
}

.descriptions .main-text {
  margin-top: var(--space-400);
  color: var(--slate-600);
}

footer {
  display: flex;
  flex-direction: column;
  align-items: center;
}

footer .step-number {
  position: relative;
  z-index: 1;
}

.footer-contents {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-image: linear-gradient(
      rgba(77, 150, 169, 0.85),
      rgba(77, 150, 169, 0.85)
    ),
    url(./assets/mobile/image-footer.jpg);
  padding: var(--space-800) var(--space-400);
  margin-top: -28px;
  color: var(--white);
  text-align: center;
  position: relative;
  z-index: 0;
}

.footer-contents p {
  margin: var(--space-300) 0;
}

/* 태블릿 */
@media (min-width: 768px) {
  .text-preset-1 {
    font-weight: 900;
    font-size: 48px;
    line-height: 110%;
  }

  .text-preset-2 {
    font-weight: 900;
    font-size: 36px;
    line-height: 110%;
  }

  .text-preset-3 {
    font-weight: 900;
    font-size: 14px;
    line-height: 110%;
    letter-spacing: 4px;
  }

  .people {
    height: 303px;
  }

  .hero-section {
    margin: var(--space-900) 0;
    padding: 0 185px;
  }

  .btn-purple {
    margin-left: 17px;
  }

  .btn-container {
    margin-top: var(--space-300);
  }

  section {
    padding: var(--space-700) var(--space-500);
  }

  .images {
    width: 100%;
    display: grid;
    gap: var(--space-300);
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-template-rows: none;
  }

  .descriptions {
    width: 500px;
  }

  .footer-contents {
    width: 100%;
    padding: var(--space-800) var(--space-1400);
    background-position: center;
    background-repeat: no-repeat;
    background-image: linear-gradient(
        rgba(77, 150, 169, 0.85),
        rgba(77, 150, 169, 0.85)
      ),
      url(./assets/tablet/image-footer.jpg);
  }
}

/* 데스크탑 */
@media (min-width: 1024px) {
  .text-preset-1 {
    font-weight: 900;
    font-size: 64px;
    line-height: 110%;
  }

  .text-preset-2 {
    font-weight: 900;
    font-size: 40px;
    line-height: 110%;
  }

  .text-preset-3 {
    font-weight: 900;
    font-size: 16px;
    line-height: 110%;
    letter-spacing: 4px;
  }

  .text-preset-4 {
    font-weight: 500;
    font-size: 18px;
    line-height: 110%;
  }

  .logo {
    margin-top: var(--space-1000);
  }

  .people {
    display: none;
  }

  header {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    align-items: center;
    overflow: hidden;
  }

  .faces-left img,
  .faces-right img {
    width: 100%;
  }

  .faces-left {
    display: block;
    justify-self: start;
  }

  .faces-right {
    display: block;
    justify-self: end;
  }

  .hero-section {
    text-align: center;
    padding: 0 var(--space-400);
  }

  section {
    padding: var(--space-700) 160px;
  }

  .footer-contents {
    width: 100%;
    display: grid;
    grid-template-columns: 445px 335px 256px;
    gap: var(--space-400);
    align-items: center;
    overflow: hidden;
    text-align: left;
    padding: var(--space-1400) 160px;
    background-position: left;
    background-repeat: no-repeat;
    background-image: linear-gradient(
        rgba(77, 150, 169, 0.85),
        rgba(77, 150, 169, 0.85)
      ),
      url(./assets/desktop/image-footer.jpg);
  }

  .footer-contents button {
    justify-self: end;
  }

  .footer-contents p,
  .footer-contents h2 {
    justify-self: start;
  }

  footer .step-number {
  }
}