/* Reset & Base Styles */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; line-height: 1.6; color: #333; background-color: #f8f9fa; }
a { text-decoration: none; color: #0b5cff; }
a:hover { text-decoration: underline; }
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header & Nav */
.header { background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; }
.nav-container { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo a { font-size: 24px; color: #0b5cff; text-decoration: none; display: flex; align-items: center; }
.nav ul { list-style: none; display: flex; gap: 30px; }
.nav a { color: #555; font-weight: 500; font-size: 16px; }
.nav a:hover, .nav a.active { color: #0b5cff; text-decoration: none; }

/* Buttons */
.btn { display: inline-block; padding: 12px 28px; border-radius: 8px; font-weight: 600; text-align: center; cursor: pointer; transition: all 0.3s ease; text-decoration: none !important; }
.btn-primary { background-color: #0b5cff; color: #fff; border: 2px solid #0b5cff; }
.btn-primary:hover { background-color: #0044cc; border-color: #0044cc; color: #fff; }
.btn-secondary { background-color: #2d3748; color: #fff; border: 2px solid #2d3748; }
.btn-secondary:hover { background-color: #1a202c; color: #fff; }
.btn-outline { background-color: transparent; color: #0b5cff; border: 2px solid #0b5cff; }
.btn-outline:hover { background-color: #f0f5ff; }
.btn-large { padding: 15px 35px; font-size: 18px; }

/* Hero Section */
.hero { background: linear-gradient(135deg, #f0f5ff 0%, #e6f0ff 100%); padding: 80px 0; text-align: center; border-bottom: 1px solid #e2e8f0; }
.hero h1 { font-size: 48px; color: #1a202c; margin-bottom: 20px; font-weight: 800; }
.hero .subtitle { font-size: 20px; color: #4a5568; max-width: 700px; margin: 0 auto 40px; }
.download-buttons { display: flex; gap: 20px; justify-content: center; margin-bottom: 30px; }
.version-info { font-size: 14px; color: #718096; }

/* Content Sections */
.content-section { padding: 80px 20px; text-align: center; }
.content-section h2 { font-size: 32px; margin-bottom: 20px; color: #1a202c; }
.content-section > p { font-size: 18px; color: #4a5568; max-width: 800px; margin: 0 auto 50px; }

.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.feature-card { background: #fff; padding: 40px 30px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); transition: transform 0.3s ease; text-align: left; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px rgba(0,0,0,0.1); }
.feature-card h3 { font-size: 20px; margin-bottom: 15px; color: #0b5cff; }
.feature-card p { color: #4a5568; }

/* Download Section */
.bg-light { background-color: #f1f5f9; padding: 80px 0; }
.download-section h2 { text-align: center; font-size: 32px; margin-bottom: 50px; color: #1a202c; }
.download-box { background: #fff; border-radius: 16px; padding: 40px; display: flex; align-items: center; gap: 40px; box-shadow: 0 10px 25px rgba(0,0,0,0.05); margin-bottom: 30px; }
.os-icon { font-size: 64px; }
.download-info { flex: 1; }
.download-info h3 { font-size: 24px; margin-bottom: 15px; }
.download-info p { color: #4a5568; margin-bottom: 15px; }
.req-list { list-style-type: none; display: flex; gap: 20px; flex-wrap: wrap; color: #718096; font-size: 14px; }
.req-list li::before { content: "✓"; color: #38a169; margin-right: 5px; font-weight: bold; }
.download-action { display: flex; flex-direction: column; gap: 15px; min-width: 200px; }

/* SEO Content */
.seo-content { padding: 60px 20px; }
.seo-content h2 { font-size: 28px; margin-bottom: 30px; text-align: center; border-bottom: 2px solid #e2e8f0; padding-bottom: 15px; }
.seo-content article { background: #fff; padding: 40px; border-radius: 12px; box-shadow: 0 2px 10px rgba(0,0,0,0.03); }
.seo-content h3 { font-size: 20px; color: #2d3748; margin: 25px 0 15px; }
.seo-content p { color: #4a5568; margin-bottom: 15px; text-indent: 2em; }
.seo-content strong { color: #000; }

/* Inner Pages (Features & FAQ) */
.page-content { padding: 60px 20px; background: #fff; min-height: 60vh; margin-top: 40px; margin-bottom: 40px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.page-content h1 { font-size: 36px; margin-bottom: 20px; color: #1a202c; text-align: center; border-bottom: 2px solid #edf2f7; padding-bottom: 20px; }
.page-content .lead { font-size: 18px; color: #4a5568; text-align: center; max-width: 800px; margin: 0 auto 40px; }
.feature-detail { margin-bottom: 40px; padding-bottom: 30px; border-bottom: 1px dashed #e2e8f0; }
.feature-detail:last-child { border-bottom: none; }
.feature-detail h2 { color: #0b5cff; margin-bottom: 15px; font-size: 24px; }
.feature-detail p { font-size: 16px; color: #4a5568; line-height: 1.8; }
.cta-section { text-align: center; background: #f0f5ff; padding: 40px; border-radius: 12px; margin-top: 50px; }
.cta-section h3 { font-size: 24px; margin-bottom: 15px; }
.cta-section p { margin-bottom: 25px; color: #4a5568; }

.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { margin-bottom: 30px; }
.faq-item h3 { font-size: 20px; color: #2d3748; margin-bottom: 10px; background: #f7fafc; padding: 15px 20px; border-left: 4px solid #0b5cff; border-radius: 0 8px 8px 0; }
.faq-item p { color: #4a5568; padding: 0 20px; line-height: 1.7; }

/* Footer */
.footer { background: #1a202c; color: #a0aec0; padding: 40px 0 20px; text-align: center; }
.footer-links { margin-bottom: 20px; }
.footer-links a { color: #cbd5e0; margin: 0 10px; }
.footer-links a:hover { color: #fff; }
.disclaimer { margin-top: 20px; font-size: 12px; color: #718096; }
.disclaimer a { color: #718096; }

/* Responsive */
@media (max-width: 768px) {
    .nav ul { display: none; } /* Simplified for mobile */
    .hero h1 { font-size: 32px; }
    .download-buttons { flex-direction: column; }
    .download-box { flex-direction: column; text-align: center; gap: 20px; }
    .req-list { justify-content: center; }
}