/* Reset & Base Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; line-height: 1.6; color: #333; background-color: #f9fafb; }
a { text-decoration: none; color: #2563eb; transition: color 0.3s; }
a:hover { color: #1d4ed8; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.mt-5 { margin-top: 3rem; }

/* Navbar */
.navbar { background-color: #ffffff; box-shadow: 0 1px 3px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
.navbar .container { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.navbar .logo h1 { font-size: 1.5rem; color: #111827; font-weight: 700; }
.navbar nav ul { display: flex; gap: 2rem; }
.navbar nav a { color: #4b5563; font-weight: 500; }
.navbar nav a:hover, .navbar nav a.active { color: #2563eb; }

/* Buttons */
.btn { display: inline-block; padding: 0.5rem 1.5rem; border-radius: 0.375rem; font-weight: 600; text-align: center; cursor: pointer; transition: all 0.3s; }
.btn-primary { background-color: #2563eb; color: #ffffff; border: 1px solid #2563eb; }
.btn-primary:hover { background-color: #1d4ed8; color: #ffffff; }
.btn-outline { background-color: transparent; color: #2563eb; border: 1px solid #2563eb; }
.btn-outline:hover { background-color: #eff6ff; }
.btn-large { padding: 0.75rem 2rem; font-size: 1.125rem; }
.btn-block { display: block; width: 100%; }

/* Hero Section */
.hero { padding: 5rem 0; background: linear-gradient(to right, #eff6ff, #ffffff); }
.hero .container { display: flex; align-items: center; gap: 4rem; }
.hero-text { flex: 1; }
.hero-text h2 { font-size: 3rem; line-height: 1.2; margin-bottom: 1.5rem; color: #111827; }
.hero-text p { font-size: 1.125rem; color: #4b5563; margin-bottom: 2rem; }
.hero-actions { display: flex; gap: 1rem; }

/* Features Section */
.features { padding: 5rem 0; background-color: #ffffff; }
.section-title { text-align: center; font-size: 2.25rem; margin-bottom: 3rem; color: #111827; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.feature-card { padding: 2rem; background-color: #f9fafb; border-radius: 0.5rem; border: 1px solid #e5e7eb; transition: transform 0.3s, box-shadow 0.3s; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1); }
.feature-card h3 { font-size: 1.25rem; margin-bottom: 1rem; color: #1f2937; }
.feature-card p { color: #4b5563; }

/* Page Content (Download, FAQ) */
.page-content { padding: 4rem 0; }
.download-header, .faq-header { margin-bottom: 3rem; }
.download-header h2, .faq-header h2 { font-size: 2.5rem; margin-bottom: 1rem; color: #111827; }
.download-header p, .faq-header p { font-size: 1.125rem; color: #4b5563; }

/* Download Grid */
.download-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
.download-card { padding: 2.5rem 1.5rem; background-color: #ffffff; border-radius: 0.75rem; border: 1px solid #e5e7eb; text-align: center; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); }
.download-card h3 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.download-card p { color: #6b7280; margin-bottom: 1.5rem; font-size: 0.875rem; }
.version-info { font-weight: 600; color: #374151 !important; }

/* FAQ List */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background-color: #ffffff; padding: 1.5rem; border-radius: 0.5rem; border: 1px solid #e5e7eb; margin-bottom: 1rem; }
.faq-item h3 { font-size: 1.25rem; color: #111827; margin-bottom: 0.75rem; }
.faq-item p { color: #4b5563; }

/* SEO Content Area (Hidden Value for Ranking) */
.seo-content { padding: 3rem; background-color: #eff6ff; border-radius: 0.5rem; margin-top: 4rem; }
.seo-content h2, .seo-content h3 { font-size: 1.5rem; margin-bottom: 1rem; color: #1e3a8a; }
.seo-content p { margin-bottom: 1rem; color: #374151; }
.seo-content strong { color: #1d4ed8; }

/* Footer */
footer { background-color: #111827; color: #9ca3af; padding: 4rem 0 2rem; margin-top: 4rem; }
.footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 3rem; margin-bottom: 3rem; }
.footer-col h3 { color: #ffffff; font-size: 1.25rem; margin-bottom: 1.5rem; }
.footer-col ul li { margin-bottom: 0.75rem; }
.footer-col ul li a { color: #9ca3af; }
.footer-col ul li a:hover { color: #ffffff; }
.footer-bottom { border-top: 1px solid #374151; padding-top: 2rem; text-align: center; }

/* Responsive */
@media (max-width: 768px) {
    .hero .container { flex-direction: column; text-align: center; }
    .hero-actions { justify-content: center; }
    .navbar nav ul { display: none; }
}