/* Reset and Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-accent: #c6a052;
    --color-accent-hover: #d4af61;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-bg: #fafafa;
    --color-white: #ffffff;
    --color-border: #e2e8f0;
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

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

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--color-primary);
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--color-primary);
    color: var(--color-white);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.25rem;
    border-radius: 4px;
}

.logo-text {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-white);
    padding: calc(var(--spacing-xl) + 60px) var(--spacing-md) var(--spacing-xl);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-tagline {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.8;
    margin-bottom: var(--spacing-sm);
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Featured Book */
.featured-book {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--color-white);
}

.book-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.book-image {
    position: relative;
}

.book-image img {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.book-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
}

.book-category {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.book-details h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
}

.book-author {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.book-description {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.book-quote {
    background: var(--color-bg);
    padding: var(--spacing-md);
    border-left: 4px solid var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-style: italic;
    color: var(--color-text);
}

.book-quote cite {
    display: block;
    margin-top: var(--spacing-sm);
    font-style: normal;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.buy-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 54, 93, 0.3);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    background: var(--color-bg);
}

.book-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.book-link:hover {
    text-decoration: underline;
}

/* Recommended Reading */
.reading-section {
    padding: var(--spacing-lg) var(--spacing-md);
    background: var(--color-bg);
}

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

.reading-container h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.reading-container > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.recommended-book {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--color-white);
    padding: var(--spacing-sm);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.recommended-book img {
    width: 80px;
    height: auto;
    border-radius: 4px;
}

.recommended-book strong {
    display: block;
    color: var(--color-primary);
}

.recommended-book span {
    display: block;
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.recommended-book a {
    color: var(--color-accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
}

.recommended-book a:hover {
    text-decoration: underline;
}

/* About Section */
.about-section {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--color-white);
}

.about-container {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-container h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.about-container > p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.value {
    padding: var(--spacing-md);
}

.value-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.value h4 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.value p {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* Footer */
.footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.footer-brand .logo-icon {
    width: 30px;
    height: 30px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.2);
}

.footer-tagline {
    opacity: 0.7;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    color: var(--color-white);
    text-decoration: none;
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-links .divider {
    margin: 0 var(--spacing-sm);
    opacity: 0.5;
}

.copyright {
    font-size: 0.85rem;
    opacity: 0.6;
}

/* Responsive */
@media (max-width: 900px) {
    .book-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .book-image {
        display: flex;
        justify-content: center;
    }
    
    .book-image img {
        max-width: 280px;
    }
    
    .book-badge {
        right: auto;
        left: 50%;
        transform: translateX(80px);
    }
    
    .buy-buttons {
        justify-content: center;
    }
    
    .about-values {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .nav-links {
        display: none;
    }
    
    .book-details h2 {
        font-size: 1.75rem;
    }
    
    .buy-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}