.chapters-hero {
  background: #f1f5f7;
  padding: 74px 0 78px;
}
.chapters-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.07fr;
  gap: 8%;
  align-items: center;
}
.chapters-hero h1 {
  font-size: clamp(48px, 5.4vw, 76px);
  line-height: 1.04;
}
.chapters-hero p {
  font-size: 19px;
  line-height: 1.58;
  max-width: 540px;
  margin: 25px 0 30px;
}
.chapters-hero img {
  width: 100%;
  aspect-ratio: 1.27;
  object-fit: cover;
  border-radius: 5px;
}
.chapters-stats {
  background: #315775;
  padding: 37px 0;
}
.chapters-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}
.chapters-stats-grid > div {
  padding: 14px 25px;
  border-right: 1px solid #7090a7;
}
.chapters-stats-grid > div:first-child {
  padding-left: 0;
}
.chapters-stats-grid > div:last-child {
  border: 0;
}
.chapters-stats strong {
  display: block;
  color: var(--blue);
  font: 600 clamp(37px, 4vw, 58px) / 1 var(--font-display);
}
.chapters-stats span {
  display: block;
  color: #e5eef2;
  margin-top: 6px;
  font-size: 15px;
}
.chapters-explain {
  padding: 89px 0;
}
.chapters-explain-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 10%;
}
.chapters-explain h2,
.chapters-directory h2,
.chapters-join h2 {
  font-size: clamp(35px, 4vw, 55px);
  line-height: 1.12;
}
.chapters-explain p {
  font-size: 18px;
  line-height: 1.7;
  margin-bottom: 18px;
}
.chapters-directory {
  background: #f5f7f8;
  padding: 90px 0 105px;
  scroll-margin-top: 110px;
}
.chapters-directory-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
}
.chapters-directory-head p {
  font-size: 17px;
  max-width: 640px;
  margin-top: 14px;
}
.chapters-directory-head span {
  color: var(--copy);
  white-space: nowrap;
  font-size: 15px;
}
.chapters-directory input {
  width: 100%;
  max-width: 530px;
  border: 1px solid #bdcbd2;
  border-radius: 4px;
  background: #fff;
  padding: 15px 19px;
  color: #30465e;
  font: inherit;
  margin: 32px 0 29px;
}
.chapters-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 28px;
}
.chapters-list a,
.chapters-list .chapter-name {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 67px;
  padding: 12px 3px;
  border-top: 1px solid #dbe4e8;
  color: #425c6d;
  font-size: 16px;
  line-height: 1.35;
}
.chapters-list a:hover {
  color: #1f6f9d;
  padding-left: 10px;
}
.chapters-list .chapter-arrow {
  color: var(--blue);
  font-size: 21px;
}
.chapters-empty {
  grid-column: 1/-1;
  font-size: 17px;
  padding: 24px 0;
}
.chapters-join {
  padding: 96px 0;
}
.chapters-join-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8%;
  align-items: center;
}
.chapters-join img {
  width: 100%;
  aspect-ratio: 1.2;
  object-fit: cover;
  border-radius: 5px;
}
.chapters-join p {
  font-size: 18px;
  line-height: 1.65;
  max-width: 550px;
  margin: 20px 0 29px;
}
.chapters-join-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
@media (max-width: 900px) {
  .chapters-hero-grid,
  .chapters-explain-grid,
  .chapters-join-grid {
    grid-template-columns: 1fr;
    gap: 31px;
  }
  .chapters-hero {
    padding: 56px 0;
  }
  .chapters-hero img {
    aspect-ratio: 1.45;
  }
  .chapters-explain,
  .chapters-directory,
  .chapters-join {
    padding: 68px 0;
  }
  .chapters-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 600px) {
  .chapters-hero h1 {
    font-size: clamp(42px, 11vw, 56px);
  }
  .chapters-hero p,
  .chapters-explain p,
  .chapters-join p {
    font-size: 17px;
  }
  .chapters-hero .btn-primary {
    display: flex;
    justify-content: center;
  }
  .chapters-stats {
    padding: 22px 0;
  }
  .chapters-stats-grid > div {
    padding: 10px 11px;
  }
  .chapters-stats strong {
    font-size: clamp(25px, 7vw, 36px);
  }
  .chapters-stats span {
    font-size: 12px;
    line-height: 1.25;
  }
  .chapters-directory-head {
    display: block;
  }
  .chapters-directory-head span {
    display: block;
    margin-top: 12px;
  }
  .chapters-directory input {
    margin: 25px 0;
  }
  .chapters-list {
    grid-template-columns: 1fr;
  }
  .chapters-join-links {
    display: grid;
  }
  .chapters-join-links a {
    justify-content: center;
  }
}