/* Navigation */
#navbar {
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 1000;
  transition: background-color 0.3s ease, padding 0.3s ease;
  padding: var(--spacing-4) 0;
}

.navbar-scrolled {
  background-color: var(--color-accent);
  padding: var(--spacing-2) 0 !important;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-6);
}

.nav-link {
  font-weight: 600;
  color: var(--color-neutral-100);
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: var(--color-primary);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.bar {
  width: 25px;
  height: 3px;
  background-color: var(--color-primary);
  margin: 3px 0;
  transition: 0.4s;
}

/* Hero Section */
.hero-section {
  min-height: 100vh;
  background-image: url('https://images.pexels.com/photos/2760243/pexels-photo-2760243.jpeg');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  position: relative;
  color: var(--color-neutral-100);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 600px;
}

.hero-section h1 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
  line-height: 1.1;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-section h2 {
  color: var(--color-neutral-100);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-4);
  text-transform: uppercase;
}

.author {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-8);
  color: var(--color-neutral-300);
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-4);
}

.hero-section .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.book-cover {
  position: relative;
  z-index: 1;
}

.cover-img {
  max-width: 300px;
  box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.4);
  border: 8px solid var(--color-neutral-100);
  transform: rotate(3deg);
}

/* Book Section */
.book-section {
  background-color: var(--color-neutral-100);
}

.book-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-8);
  align-items: start;
}

.book-description {
  padding: var(--spacing-6);
  background-color: var(--color-neutral-200);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.intro-text {
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--color-secondary-dark);
}

.book-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.highlight-card {
  background-color: var(--color-neutral-800);
  color: var(--color-neutral-100);
  padding: var(--spacing-6);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  border-left: 5px solid var(--color-primary);
}

.highlight-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
}

/* Key Points Section */
.key-points-section {
  background-color: var(--color-accent-light);
  color: var(--color-neutral-100);
  padding: var(--spacing-20) 0;
}

.points-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-8);
}

.key-point {
  background-color: var(--color-accent-dark);
  padding: var(--spacing-6);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.key-point:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.key-point::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background-color: var(--color-primary);
}

.point-number {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(255, 209, 0, 0.15);
  z-index: -1;
}

.key-point h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
  margin-top: var(--spacing-4);
}

.key-point p {
  color: var(--color-neutral-300);
}

/* Author Section */
.author-section {
  background-color: var(--color-neutral-200);
}

.author-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-8);
  align-items: center;
}

.author-image {
  position: relative;
}

.image-placeholder {
  position: relative;
  width: 100%;
  padding-top: 100%; /* 1:1 Aspect Ratio */
  overflow: hidden;
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
  border: 8px solid var(--color-neutral-100);
}

.author-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-bio h3 {
  font-size: 2rem;
  margin-bottom: var(--spacing-4);
  color: var(--color-secondary-dark);
}

.author-quote {
  margin-top: var(--spacing-6);
  padding: var(--spacing-6);
  background-color: var(--color-neutral-800);
  border-radius: var(--border-radius);
  position: relative;
}

.author-quote blockquote {
  font-style: italic;
  color: var(--color-neutral-100);
  font-size: 1.25rem;
  line-height: 1.4;
  position: relative;
  padding-left: var(--spacing-4);
  border-left: 4px solid var(--color-primary);
}

/* Purchase Section */
.purchase-section {
  background-image: url('https://images.pexels.com/photos/207204/pexels-photo-207204.jpeg');
  background-size: cover;
  background-position: center;
  position: relative;
  color: var(--color-neutral-100);
}

.purchase-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.8);
}

.purchase-section .container {
  position: relative;
  z-index: 1;
}

.purchase-options {
  display: flex;
  justify-content: center;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-12);
}

.purchase-card {
  background-color: var(--color-neutral-800);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  width: 100%;
  max-width: 350px;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.purchase-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.purchase-card.featured {
  transform: scale(1.05);
  border: 2px solid var(--color-primary);
}

.purchase-card.featured:hover {
  transform: scale(1.05) translateY(-10px);
}

.card-header {
  background-color: var(--color-accent-dark);
  padding: var(--spacing-4);
  text-align: center;
}

.card-header h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
}

.price {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-neutral-100);
}

.card-content {
  padding: var(--spacing-6);
  display: flex;
  flex-direction: column;
}

.card-content ul {
  list-style: none;
  margin-bottom: var(--spacing-6);
}

.card-content ul li {
  margin-bottom: var(--spacing-3);
  padding-left: var(--spacing-6);
  position: relative;
}

.card-content ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.card-content .btn {
  margin-top: auto;
}

.guarantee {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  padding: var(--spacing-6);
  border: 2px dashed var(--color-primary);
  border-radius: var(--border-radius);
}

.guarantee h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

/* Newsletter Section */
.newsletter-section {
  background-color: var(--color-neutral-800);
  color: var(--color-neutral-100);
  text-align: center;
}

.newsletter-content {
  max-width: 600px;
  margin: 0 auto;
}

.newsletter-form {
  margin-top: var(--spacing-6);
}

.form-group {
  display: flex;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

input[type="email"] {
  flex: 1;
  padding: var(--spacing-3) var(--spacing-4);
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: var(--font-family);
}

.form-disclaimer {
  font-size: 0.875rem;
  color: var(--color-neutral-500);
}