*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* NAV */
#nav { transition: background-color 0.4s, box-shadow 0.4s, padding 0.4s; }
#nav.scrolled { background-color: rgba(255,255,255,0.97); backdrop-filter: blur(12px); box-shadow: 0 1px 0 rgba(0,0,0,0.06); }
#nav.scrolled .font-serif { color: #0f172a; }
#nav.scrolled .menu-line { background-color: #1e293b; }

/* MOBILE MENU */
#mobileMenu.open { opacity: 1 !important; pointer-events: all !important; }
.mobile-link { transition: opacity 0.3s, transform 0.3s; opacity: 0; transform: translateY(12px); }
#mobileMenu.open .mobile-link { opacity: 1; transform: translateY(0); }
#mobileMenu.open .mobile-link:nth-child(1) { transition-delay: 0.05s; }
#mobileMenu.open .mobile-link:nth-child(2) { transition-delay: 0.1s; }
#mobileMenu.open .mobile-link:nth-child(3) { transition-delay: 0.15s; }
#mobileMenu.open .mobile-link:nth-child(4) { transition-delay: 0.2s; }
#mobileMenu.open .mobile-link:nth-child(5) { transition-delay: 0.25s; }

/* HERO ANIMATIONS */
.hero-sub { animation: fadeUp 0.8s ease forwards; animation-delay: 0.3s; }
.hero-title { animation: fadeUp 0.8s ease forwards; animation-delay: 0.5s; }
.hero-desc { animation: fadeUp 0.8s ease forwards; animation-delay: 0.7s; }
.hero-cta { animation: fadeUp 0.8s ease forwards; animation-delay: 0.9s; }
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

/* REVEAL ON SCROLL */
.reveal { opacity: 0; transform: translateY(32px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }

/* PRODUCT CARDS */
.product-card { transition: background-color 0.4s ease; }
.product-card img { transition: transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94); }

/* WHY CARDS */
.why-card { transition: background-color 0.4s ease; }

/* SCROLLBAR */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f8fafc; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* FOCUS */
*:focus-visible { outline: 2px solid #0d9488; outline-offset: 2px; border-radius: 4px; }

/* SELECTION */
::selection { background: rgba(13,148,136,0.15); color: #134e4a; }