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

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

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

/* Header */
header {
    padding: 2rem 0;
    text-align: center;
}

.logo h1 {
    font-size: 3rem;
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.tagline {
    color: rgba(255,255,255,0.9);
    font-size: 1.2rem;
    font-weight: 400;
}

/* Main content */
main {
    background: white;
    border-radius: 20px 20px 0 0;
    margin-top: 2rem;
    box-shadow: 0 -10px 30px rgba(0,0,0,0.1);
    overflow: hidden;
}

/* Hero section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Downloads section */
.downloads {
    padding: 4rem 2rem;
    background: #f8fafc;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.download-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    border-color: #667eea;
}

.platform-icon {
    margin-bottom: 1rem;
    color: #667eea;
}

.download-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #1a202c;
}

.download-card p {
    color: #718096;
    margin-bottom: 1.5rem;
}

.download-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.download-btn span {
    font-size: 1rem;
}

.download-btn small {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-top: 0.25rem;
}

/* Features section */
.features {
    padding: 4rem 2rem;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1a202c;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature {
    text-align: center;
    padding: 2rem;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.feature:hover {
    background: #f8fafc;
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #1a202c;
}

.feature p {
    color: #718096;
    line-height: 1.6;
}

/* Info section */
.info {
    padding: 4rem 2rem;
    background: #f8fafc;
}

.info h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1a202c;
}

.requirements {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.requirement {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.requirement h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1a202c;
}

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

.requirement li {
    padding: 0.5rem 0;
    color: #718096;
    position: relative;
    padding-left: 1.5rem;
}

.requirement li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

/* Footer */
footer {
    background: #1a202c;
    color: white;
    padding: 2rem;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .logo h1 {
        font-size: 2.5rem;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .downloads,
    .features,
    .info {
        padding: 3rem 1rem;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .requirements {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 3rem 1rem;
    }
    
    .download-card {
        padding: 1.5rem;
    }
    
    .feature {
        padding: 1.5rem;
    }
    
    .requirement {
        padding: 1.5rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.download-card,
.feature,
.requirement {
    animation: fadeInUp 0.6s ease-out;
}

.download-card:nth-child(1) { animation-delay: 0.1s; }
.download-card:nth-child(2) { animation-delay: 0.2s; }
.download-card:nth-child(3) { animation-delay: 0.3s; }

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
.download-btn:focus,
.footer-links a:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}