/* Reset and Base Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; 
    background-color: #f5f5f7; /* Apple's default light gray background */
    color: #1d1d1f; 
    -webkit-font-smoothing: antialiased;
}

/* Global Navigation */
.global-nav {
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    height: 44px;
    z-index: 9999;
}
.nav-content {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 15px;
}
.nav-content a {
    color: #f5f5f7;
    text-decoration: none;
    font-size: 12px;
    opacity: 0.8;
    transition: opacity 0.3s;
    letter-spacing: -0.01em;
}
.nav-content a:hover { opacity: 1; }
.logo { font-size: 18px !important; }

/* Hero Sections */
.hero {
    text-align: center;
    padding-top: 100px; /* Account for fixed nav + spacing */
    height: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 12px;
}
.dark-theme { background-color: #000; color: #f5f5f7; }
.light-theme { background-color: #f5f5f7; color: #1d1d1f; }

.product-title {
    font-size: 56px;
    font-weight: 600;
    letter-spacing: -0.005em;
    margin-bottom: 6px;
}
.product-tagline {
    font-size: 28px;
    font-weight: 400;
    margin-bottom: 15px;
}

/* Call to Action Links */
.cta-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 10px;
}
.btn-link {
    color: #2997ff;
    text-decoration: none;
    font-size: 21px;
    font-weight: 400;
    letter-spacing: 0.011em;
}
.btn-link:hover { text-decoration: underline; }

/* Promo Grid */
.promo-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 0 12px;
    margin-bottom: 12px;
}
.promo-item {
    height: 500px;
    text-align: center;
    padding-top: 40px;
    position: relative;
}
.promo-title { font-size: 40px; font-weight: 600; margin-bottom: 4px; }
.promo-subtitle { font-size: 21px; font-weight: 400; margin-bottom: 15px; }
.promo-item .btn-link { font-size: 17px; }

/* Footer */
.global-footer {
    background-color: #f5f5f7;
    color: #86868b;
    font-size: 12px;
    padding: 20px;
}
.footer-content { max-width: 980px; margin: 0 auto; }
.footer-content p { margin-bottom: 10px; }
.footer-content hr { border: none; border-top: 1px solid #d2d2d7; margin: 20px 0; }
.footer-copyright { display: flex; justify-content: space-between; flex-wrap: wrap; }
.footer-links a { color: #515154; text-decoration: none; margin: 0 5px; }
.footer-links a:hover { text-decoration: underline; }