body {
  font-size: 17px;
  line-height: 1.65;
}

.navbar-title {
  font-weight: 700;
}

.hero {
  padding: 80px 10%;
  background: #f4f6f8;
  border-radius: 18px;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.25rem;
  max-width: 850px;
}

.hero-buttons {
  margin-top: 30px;
}

.hero-buttons a {
  margin-right: 12px;
  margin-bottom: 12px;
}

.section-title {
  margin-top: 50px;
  margin-bottom: 25px;
  font-weight: 700;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 25px;
}

.card {
  border: 1px solid #e1e4e8;
  border-radius: 16px;
  padding: 24px;
  background: white;
  box-shadow: 0 4px 14px rgba(0,0,0,0.04);
}

.card h3 {
  margin-top: 0;
  font-weight: 700;
}

.card p {
  color: #333;
}

.highlight {
  background: #f8f9fa;
  border-left: 5px solid #2c3e50;
  padding: 20px;
  margin: 35px 0;
}

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

  .hero {
    padding: 45px 25px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }
}

.profile-header {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 35px;
  align-items: center;
  margin-top: 30px;
  margin-bottom: 40px;
  padding: 30px;
  background: #f4f6f8;
  border-radius: 18px;
}

.profile-photo {
  width: 170px;
  height: 220px;
  object-fit: cover;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.15);
}

.profile-title h1 {
  margin-bottom: 10px;
}

.profile-role {
  font-size: 1.2rem;
  color: #555;
  margin-bottom: 20px;
}

.profile-links a {
  margin-right: 10px;
  margin-top: 10px;
}

@media (max-width: 900px) {

  .profile-header {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .profile-photo {
    margin: auto;
  }

}

.book-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 28px;
  align-items: start;
  border: 1px solid #e1e4e8;
  border-radius: 18px;
  padding: 24px;
  background: #ffffff;
  box-shadow: 0 4px 14px rgba(0,0,0,0.05);
  margin: 25px 0 45px 0;
}

.book-cover img {
  width: 180px;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.18);
}

.book-info h3 {
  margin-top: 0;
  font-size: 1.6rem;
}

.book-info p {
  margin-bottom: 14px;
}

@media (max-width: 800px) {

  .book-card {
    grid-template-columns: 1fr;
  }

  .book-cover img {
    width: 220px;
  }

}

.featured-book {
  display: flex;
  gap: 28px;
  align-items: center;
  background: #f8f9fa;
  border: 1px solid #e1e4e8;
  border-left: 5px solid #2c3e50;
  border-radius: 16px;
  padding: 24px;
  margin: 30px 0 45px 0;
}

.featured-book-cover img {
  width: 150px;
  height: auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 6px 16px rgba(0,0,0,0.18);
}

.featured-book-text h3 {
  margin-top: 0;
  margin-bottom: 12px;
}

.featured-book-text p {
  margin-bottom: 14px;
}

@media (max-width: 800px) {
  .featured-book {
    flex-direction: column;
    align-items: flex-start;
  }

  .featured-book-cover img {
    width: 170px;
  }
}