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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background: #ffffff;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0 80px;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    opacity: 0.95;
}

/* Book Section */
.book-section {
    padding: 80px 0;
}

.book-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 60px;
    align-items: start;
}

.book-cover-wrapper {
    position: relative;
}

.book-cover {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.book-content {
    padding-top: 20px;
}

.book-description {
    font-size: 1.125rem;
    line-height: 1.8;
    color: #4a5568;
    margin-bottom: 24px;
}

.book-info {
    display: flex;
    gap: 40px;
    margin: 40px 0;
    padding: 24px 0;
    border-top: 1px solid #e2e8f0;
    border-bottom: 1px solid #e2e8f0;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.info-label {
    font-size: 0.875rem;
    color: #718096;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.info-value {
    font-size: 1.125rem;
    color: #2c3e50;
    font-weight: 600;
}

.btn-buy {
    display: inline-block;
    background: #667eea;
    color: white;
    padding: 16px 40px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.0625rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-buy:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.5);
}

/* About Section */
.about-section {
    background: #f7fafc;
    padding: 60px 0;
}

.about-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    font-size: 1.75rem;
    margin-bottom: 16px;
    color: #2c3e50;
}

.about-content p {
    font-size: 1.0625rem;
    color: #4a5568;
    line-height: 1.7;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 32px 0;
    text-align: center;
}

.footer p {
    font-size: 0.9375rem;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .book-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .book-cover {
        max-width: 300px;
        margin: 0 auto;
        display: block;
    }
    
    .book-info {
        flex-direction: column;
        gap: 20px;
    }
    
    .btn-buy {
        width: 100%;
        text-align: center;
    }
}