body {
  font-family: 'Segoe UI', sans-serif;
  background: #fff;
  color: #1a1a1a;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 3rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.hero {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 3rem;
}

.hero-left {
  flex: 1 1 500px;
}

.subtitle {
  font-size: 1.1rem;
  font-weight: 400;
  color: #666;
  margin-bottom: 0.3rem;
}

h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin: 0.2rem 0 1.2rem;
  text-transform: uppercase;
}

.hero-right {
  flex: 1 1 300px;
  max-width: 400px;
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tagline {
  display: inline-block;
  background: #fbd6db;
  color: #c0392b;
  padding: 0.4rem 1.2rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  margin-left: auto;
  margin-right: auto;
}

h2 {
  font-size: 1.2rem;
  font-weight: 400;
  color: #666;
  margin: 0 0 2rem;
}

p {
  margin: 1.2rem 0;
  font-size: 1.05rem;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.buttons a {
  background: #e60023;
  color: #fff;
  padding: 0.7rem 1.4rem;
  border-radius: 5px;
  font-weight: bold;
  text-decoration: none;
  font-size: 0.95rem;
  text-align: center;
  min-width: 140px;
  transition: background 0.2s ease;
}

.buttons a:nth-child(2) {
  background: #000;
}

.buttons a:nth-child(3) {
  background: #cc0000;
}

.buttons a:hover {
  opacity: 0.85;
}

.book-cover {
  max-width: 100%;
  border-radius: 4px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

section.features {
  margin-top: 5rem;
}

section.features h3 {
  font-size: 1.8rem;
  margin-bottom: 1.2rem;
}

.feature-list {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: 1fr;
  font-size: 1.05rem;
}

.feature-item {
  background: #f7f7f7;
  padding: 1rem 1.2rem;
  border-left: 4px solid #e60023;
  border-radius: 4px;
}

section.whats-inside {
  margin-top: 5rem;
  padding: 0 0rem;
}

section.whats-inside h3 {
  font-size: 2rem;
  margin-bottom: 2rem;
}

.chapter-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.chapter-card {
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid #ddd;
  background: #fff;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.chapter-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
  color: #111;
}

.chapter-card p {
  font-size: 1rem;
  font-weight: 400;
  color: #444;
  margin: 0;
  line-height: 1.5;
}

section.author {
  margin-top: 5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

section.author h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.author-box {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .author-box {
    flex-direction: row;
    align-items: flex-start;
  }
}

.author-photo {
  width: 180px;
  height: 180px;
  border-radius: 100%;
  object-fit: cover;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.author-bio {
  flex: 1;
}

section.review-highlight {
  margin-top: 5rem;
  text-align: center;
  padding: 3rem 1.5rem;
  color: #2c3e50;
  font-family: Georgia, serif;
}

.review-highlight blockquote {
  font-size: 1.4rem;
  line-height: 1.6;
  margin: 0 auto 2rem;
  max-width: 960px;
}

.review-author-box {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  font-family: 'Segoe UI', sans-serif;
}

.review-author-img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
}

.review-author-name {
  font-weight: bold;
}

.review-author-title {
  font-size: 0.95rem;
  color: #666;
}