/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    position: relative;
}

.logo-section {
    margin-bottom: 20px;
}

.logo {
    max-height: 160px;
    width: auto;
}

header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
    font-weight: 700;
}

header p {
    font-size: 1.2rem;
    color: #7f8c8d;
    font-weight: 300;
}

/* Navigation Cards */
.main-nav {
    margin-bottom: 40px;
}

.nav-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 25px;
}

.nav-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    display: block;
    border-left: 4px solid transparent;
}

.nav-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.calculator-card {
    border-left-color: #3498db;
}

.calculator-card:hover {
    background: linear-gradient(135deg, #f8f9fa, #e3f2fd);
}

.ais-card {
    border-left-color: #e74c3c;
}

.ais-card:hover {
    background: linear-gradient(135deg, #f8f9fa, #ffebee);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.nav-card h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
    font-weight: 600;
}

.nav-card p {
    color: #5a6c7d;
    margin-bottom: 20px;
    font-size: 1rem;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.ais-card .cta-button {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

/* Main Content */
main {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    margin-bottom: 30px;
}

/* Product Section */
.product-section {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 2.2rem;
    color: #2c3e50;
    margin-bottom: 10px;
    font-weight: 600;
}

.section-subtitle {
    font-size: 1.1rem;
    color: #7f8c8d;
    font-weight: 300;
}

/* Product Showcase */
.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
    align-items: start;
}

.product-images {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.product-image {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.product-image:hover {
    transform: scale(1.02);
}

.main-image {
    max-width: 100%;
}

.secondary-image {
    max-width: 60%;
    margin: 0 auto;
}

.product-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-card {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #3498db;
}

.info-card h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 600;
}

.info-card ul {
    list-style: none;
    padding: 0;
}

.info-card li {
    padding: 5px 0;
    color: #4a5568;
    position: relative;
    padding-left: 20px;
}

.info-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #27ae60;
    font-weight: bold;
}

/* Product Description */
.product-description {
    background: linear-gradient(135deg, #f0f8ff, #e6f3ff);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    border-left: 4px solid #4299e1;
}

.product-description p {
    font-size: 1.1rem;
    color: #2d3748;
    margin-bottom: 15px;
}

.product-description p:last-child {
    margin-bottom: 0;
}

/* In-Use Image */
.in-use-image {
    text-align: center;
    margin-bottom: 40px;
}

.usage-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

/* Purchase Section */
.purchase-section {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
}

.pricing-card {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    color: white;
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(46, 204, 113, 0.3);
    max-width: 400px;
    width: 100%;
}

.pricing-card h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.price {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.price-details {
    margin-bottom: 30px;
    opacity: 0.9;
    font-size: 1rem;
}

.paypal-button-wrapper {
    display: flex;
    justify-content: center;
}

/* Downloads Section */
.downloads-section {
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border-radius: 15px;
    padding: 30px;
    border-left: 4px solid #4299e1;
}

.downloads-section h3 {
    color: #2c3e50;
    margin-bottom: 25px;
    font-size: 1.6rem;
    font-weight: 600;
    text-align: center;
}

.downloads-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.download-card {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.download-card.current {
    border: 2px solid #27ae60;
    background: rgba(255, 255, 255, 0.95);
}

.download-card h4 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.2rem;
    font-weight: 600;
}

.download-link {
    display: block;
    color: #3498db;
    text-decoration: none;
    padding: 8px 0;
    border-bottom: 1px solid rgba(52, 152, 219, 0.1);
    transition: all 0.3s ease;
}

.download-link:hover {
    color: #2980b9;
    background: rgba(52, 152, 219, 0.05);
    padding-left: 10px;
}

.download-link:last-child {
    border-bottom: none;
}

/* Footer */
footer {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.footer-section h4 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.1rem;
    font-weight: 600;
}

.footer-section a {
    display: block;
    color: #3498db;
    text-decoration: none;
    margin-bottom: 8px;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #2980b9;
}

.footer-section p {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .nav-cards {
        grid-template-columns: 1fr;
    }
    
    .nav-card {
        padding: 25px;
    }
    
    main {
        padding: 25px;
    }
    
    .product-showcase {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .secondary-image {
        max-width: 80%;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .pricing-card {
        padding: 30px 25px;
    }
    
    .price {
        font-size: 2rem;
    }
    
    .downloads-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .card-icon {
        font-size: 2.5rem;
    }
    
    .nav-card h3 {
        font-size: 1.3rem;
    }
    
    .cta-button {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .info-card {
        padding: 20px;
    }
    
    .product-description {
        padding: 25px;
    }
    
    .downloads-section {
        padding: 25px;
    }
}