:root {
    --primary-color: #2c5530;
    --secondary-color: #8b4513;
    --accent-color: #d4a574;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --background-light: #fafafa;
    --background-white: #ffffff;
    --border-color: #e0e0e0;
    --gradient-primary: linear-gradient(135deg, #2c5530 0%, #3a6b3f 100%);
    --gradient-secondary: linear-gradient(135deg, #8b4513 0%, #a0522d 100%);
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--background-light);
}

h1, h2, h3 {
    font-family: 'Playfair Display', serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo .tagline {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-left: 0.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    color: white;
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

.cta-button {
    display: inline-block;
    background: var(--accent-color);
    color: var(--text-dark);
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 600;
    border-radius: 50px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Book Mockup */
.book-mockup {
    perspective: 1000px;
}

.book-cover {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: 10px;
    padding: 3rem;
    box-shadow: var(--shadow-heavy);
    transform: rotateY(-10deg) rotateX(5deg);
    transition: transform 0.3s ease;
}

.book-cover:hover {
    transform: rotateY(0deg) rotateX(0deg);
}

.book-cover h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
}

.book-cover p {
    color: white;
    opacity: 0.9;
}

.book-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    display: inline-block;
    margin-top: 1rem;
}

/* Sections */
.about-section {
    padding: 80px 0;
    background: var(--background-white);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

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

.feature-card {
    background: var(--background-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.chapters-section {
    padding: 80px 0;
    background: var(--background-light);
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.chapter-card {
    background: var(--background-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
    position: relative;
    overflow: hidden;
}

.chapter-card:hover {
    transform: translateY(-5px);
}

.chapter-number {
    position: absolute;
    top: -10px;
    right: 20px;
    font-size: 4rem;
    font-weight: 700;
    color: var(--accent-color);
    opacity: 0.2;
}

.chapter-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.author-section {
    padding: 80px 0;
    background: var(--background-white);
}

.author-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 3rem;
    align-items: center;
}

.author-avatar {
    width: 120px;
    height: 120px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    font-weight: 700;
}

.author-info h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.author-credentials {
    margin: 1.5rem 0;
}

.credential {
    margin-bottom: 0.5rem;
}

.author-quote {
    font-style: italic;
    color: var(--text-light);
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    margin-top: 1.5rem;
}

.purchase-section {
    padding: 80px 0;
    background: var(--gradient-secondary);
    color: white;
}

.purchase-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.purchase-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.purchase-card {
    background: var(--background-white);
    color: var(--text-dark);
    padding: 2rem;
    border-radius: 15px;
    margin: 2rem 0;
    box-shadow: var(--shadow-medium);
}

.book-mini {
    background: var(--gradient-primary);
    color: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1rem;
}

.price {
    margin: 1rem 0;
}

.current-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.format {
    color: var(--text-light);
    margin-left: 0.5rem;
}

.features {
    margin: 1rem 0;
}

.feature {
    margin: 0.5rem 0;
    color: var(--text-light);
}

.amazon-button {
    display: inline-block;
    background: #ff9900;
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 600;
    border-radius: 50px;
    transition: background-color 0.3s ease;
    margin: 1rem 0;
}

.amazon-button:hover {
    background: #e88900;
}

.additional-info {
    margin-top: 2rem;
    color: white;
    opacity: 0.9;
}

.additional-info a {
    color: var(--accent-color);
    text-decoration: none;
}

.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #333;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .author-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .nav-links {
        display: none;
    }
    
    .chapters-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-section {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
}