.site-footer {
  padding: 5rem 0 2.5rem;
  color: var(--color-black);
  background-color: var(--color-gray-bg);

  @media (width <= 767px) {
    padding: 2.5rem 0;
  }
}

.footer-main-link-grid {
  display: grid;
  grid-template:
    'top industries technology investors'
    '. industries technology investors'
    '. industries about investors'
    '. products about sustainability'
    '. products news careers'
    '. products news contact' / 1fr 1fr 1fr 1fr;
  gap: 1.5rem 1rem;
  max-width: 1360px;
  margin-bottom: 2.5rem;

  @media (width <= 767px) {
    grid-template:
      'top top'
      'industries products'
      'technology about'
      'news investors'
      'sustainability careers'
      'contact contact' / 1fr 1fr;
    gap: 1.25rem 0.75rem;
  }

  .top {
    grid-area: top;
  }

  .industries {
    grid-area: industries;
  }

  .technology {
    grid-area: technology;
  }

  .investors {
    grid-area: investors;
  }

  .products {
    grid-area: products;
  }

  .about {
    grid-area: about;
  }

  .sustainability {
    grid-area: sustainability;
  }

  .news {
    grid-area: news;
  }

  .careers {
    grid-area: careers;
  }

  .contact {
    grid-area: contact;
  }
}

.footer-main-link-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;

  @media (width <= 767px) {
    gap: 0.75rem;
  }

  li {
    font-size: clamp(0.75rem, 0.714rem + 0.18vw, 0.875rem);
    font-weight: 400;
    line-height: 1;
    letter-spacing: 0;
  }

  li:first-child {
    font-size: clamp(1.25rem, 1.036rem + 1.07vw, 2rem);
    font-weight: 700;
    line-height: 1.5;
    letter-spacing: 0.02em;

    :is([lang='ja']) & {
      font-size: clamp(1.25rem, 1.179rem + 0.36vw, 1.5rem);
    }
  }
}

.separate {
  color: var(--color-gray);
  opacity: 0.2;

  @media (width <= 767px) {
    display: none;
  }
}

.footer-bottom-grid {
  --gap: 1.5rem;

  display: grid;
  grid-template: 'logo link icon copyright' / auto;
  gap: var(--gap);
  align-items: center;
  max-width: 1360px;
  margin-top: 2.5rem;

  @media (width <= 767px) {
    --gap: 0.5rem;

    grid-template:
      'link icon'
      'logo copyright' / auto;
    gap: 2.5rem var(--gap);
  }

  .logo {
    grid-area: logo;
    justify-self: start;
  }

  .footer-bottom-link-container {
    display: flex;
    grid-area: link;
    gap: var(--gap);
    justify-self: end;
    font-size: 0.875rem;
    line-height: 1;
    color: var(--color-gray);
    letter-spacing: 0;

    @media (width <= 767px) {
      justify-self: start;
    }
  }

  .footer-bottom-link-icon-container {
    display: flex;
    grid-area: icon;
    gap: var(--gap);
    justify-self: start;

    @media (width <= 767px) {
      justify-self: end;
    }
  }

  .copyright {
    grid-area: copyright;
    justify-self: end;
    font-family: var(--font-en);
    font-size: 0.75rem;
    line-height: 1;
    color: var(--color-gray);
    letter-spacing: 0;

    @media (width <= 767px) {
      place-self: end;
    }
  }
}

.youtube-icon {
  width: 24px;
  height: 24px;

  @media (width <= 767px) {
    width: 20px;
    height: 20px;
  }
}

.linkedin-icon {
  width: 28px;
  height: 24px;

  @media (width <= 767px) {
    width: 24px;
    height: 20px;
  }
}

.youtube-icon,
.linkedin-icon {
  transition: transform 0.3s ease;

  &:hover {
    transform: translateY(-1px);
  }
}