:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f8f9fa;
    --text-color: #2c3e50;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    text-align: center;
}

nav {
    margin-top: 1rem;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 1rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: var(--secondary-color);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.product-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.main-image {
    width: 100%;
    max-width: 400px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.product-details ul {
    list-style-position: inside;
    margin: 1rem 0;
}

.product-details li {
    margin-bottom: 0.5rem;
}

.price-section {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.main-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 0.5rem 0;
}

.shipping {
    font-size: 1.1rem;
    color: var(--text-color);
    margin: 0.5rem 0;
}

.crypto-info {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.crypto-info p {
    margin: 0.5rem 0;
}

.crypto-info ul {
    list-style-type: none;
    padding: 0;
    margin: 0.5rem 0;
}

.crypto-info li {
    margin: 0.3rem 0;
    color: var(--text-color);
}

.price-note {
    font-size: 0.9rem;
    color: #666;
    font-style: italic;
}

.payment-steps ol {
    list-style-position: inside;
    margin: 1rem 0;
}

.payment-steps li {
    margin-bottom: 1rem;
}

.contact-section {
    text-align: center;
}

.contact-button {
    display: inline-block;
    margin-top: 1rem;
    padding: 1rem 2rem;
    background-color: var(--secondary-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.contact-button:hover {
    background-color: #2980b9;
}

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

@media (max-width: 768px) {
    .product-container {
        grid-template-columns: 1fr;
    }
    
    nav a {
        display: block;
        margin: 0.5rem 0;
    }
}