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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8fafc;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    color: #4a5568;
}

/* Header */
.site-header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2d3748;
    text-decoration: none;
}

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

.nav-menu a {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #3182ce;
}

.cta-button {
    background-color: #3182ce;
    color: white !important;
    padding: 0.5rem 1.5rem;
    border-radius: 0.375rem;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #2c5282;
}

/* Hero Section */
.hero-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.hero-button {
    display: inline-block;
    background-color: white;
    color: #3182ce;
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.125rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.hero-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.hero-img {
    width: 100%;
    height: auto;
    border-radius: 1rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* Common Section Styles */
section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: #2d3748;
}

/* Overview Section */
.overview-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.overview-text p {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

.overview-img {
    width: 100%;
    height: auto;
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Contents Section */
.contents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.content-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

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

.card-title {
    color: #2d3748;
    margin-bottom: 1rem;
}

/* Features Section */
.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-item {
    background: white;
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.features-img {
    width: 100%;
    height: auto;
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Benefits Section */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.benefit-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

/* Author Section */
.author-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    align-items: center;
}

.author-img {
    width: 100%;
    height: auto;
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Purchase Section */
.purchase-card {
    background: white;
    padding: 3rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 600px;
    margin: 0 auto;
}

.purchase-title {
    color: #2d3748;
    margin-bottom: 1rem;
}

.purchase-price {
    font-size: 3rem;
    font-weight: 700;
    color: #3182ce;
    margin-bottom: 2rem;
}

.purchase-features {
    list-style: none;
    margin-bottom: 2rem;
    text-align: left;
    display: inline-block;
}

.purchase-features li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.purchase-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #48bb78;
}

.purchase-button {
    display: inline-block;
    background-color: #3182ce;
    color: white;
    padding: 1rem 3rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.125rem;
    transition: background-color 0.3s;
    margin-bottom: 1rem;
}

.purchase-button:hover {
    background-color: #2c5282;
}

.purchase-guarantee {
    color: #718096;
    font-style: italic;
}

/* Testimonials Section */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.testimonial-text {
    font-style: italic;
    margin-bottom: 1rem;
}

.testimonial-author {
    color: #718096;
    font-weight: 600;
}

/* Footer */
.site-footer {
    background-color: #2d3748;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-title {
    color: white;
    margin-bottom: 0.5rem;
}

.footer-description {
    color: #cbd5e0;
}

.footer-heading {
    color: white;
    margin-bottom: 1rem;
}

.footer-menu {
    list-style: none;
}

.footer-menu a {
    color: #cbd5e0;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-menu a:hover {
    color: white;
}

.footer-button {
    display: inline-block;
    background-color: #3182ce;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s;
}

.footer-button:hover {
    background-color: #2c5282;
}

.footer-note {
    color: #cbd5e0;
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #4a5568;
}

.copyright {
    color: #cbd5e0;
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .hero-section .container,
    .overview-content,
    .author-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .main-nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    section {
        padding: 3rem 0;
    }
    
    .purchase-card {
        padding: 2rem 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .contents-grid,
    .features-list,
    .benefits-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

/* Sale Price Styling */
.purchase-price {
    position: relative;
    display: inline-block;
}

.purchase-price::after {
    content: "SALE";
    position: absolute;
    top: -10px;
    right: -60px;
    background-color: #e53e3e;
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
    padding: 4px 8px;
    border-radius: 4px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.hero-button {
    position: relative;
}

.hero-button::before {
    content: "SALE PRICE: ";
    font-weight: bold;
    color: #e53e3e;
}