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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #ff6b6b;
    --accent-secondary: #4ecdc4;
    --accent-tertiary: #ffe66d;
    --text-color: #333;
    --light-text: #666;
    --background-color: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Georgia', serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

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

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

.hero {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 50%, rgba(240, 147, 251, 0.9) 100%);
    color: var(--white);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 2rem 2rem;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.tagline {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

section {
    padding: 4rem 0;
}

h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.book-section {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.book-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.book-cover img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 10px;
    box-shadow: var(--shadow);
    display: block;
    margin: 0 auto;
}

.book-description {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--light-text);
}

.book-details {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.label {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.value {
    color: var(--light-text);
}

.buy-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    padding: 1rem 2.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    font-size: 1.1rem;
    transition: background-color 0.3s ease, transform 0.3s ease;
    margin-top: 2rem;
    align-self: flex-start;
}

.buy-button:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
}

.about-section {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--light-text);
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.contact-section {
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.95) 0%, rgba(52, 73, 94, 0.95) 100%);
    color: var(--white);
    text-align: center;
}

.contact-section h2 {
    color: var(--white);
}

.contact-text {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.email-container {
    margin-top: 2rem;
}

.email-container a {
    color: var(--white);
    font-size: 1.2rem;
    text-decoration: none;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
    transition: border-color 0.3s ease;
}

.email-container a:hover {
    border-color: var(--white);
}

footer {
    background-color: var(--secondary-color);
    color: var(--white);
    text-align: center;
    padding: 2rem;
}

footer p {
    opacity: 0.9;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .tagline {
        font-size: 1.2rem;
    }
    
    .book-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .book-cover img {
        max-width: 300px;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .book-details {
        flex-direction: column;
        gap: 1rem;
    }
}