/* Base & Reset */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #0f172a;
}
::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #334155;
}

/* Selection */
::selection {
    background: rgba(20, 184, 166, 0.3);
    color: #f1f5f9;
}

/* Navbar transition */
#navbar.scrolled {
    background: rgba(8, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(20, 184, 166, 0.1);
}

/* Mobile menu */
#mobileMenu.open {
    opacity: 1;
    pointer-events: all;
}

#mobileMenu .mobile-link {
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.4s ease;
}

#mobileMenu.open .mobile-link {
    transform: translateY(0);
    opacity: 1;
}

#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; }

/* Menu lines animation */
.menu-line {
    display: block;
}

#menuBtn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(3px, 3px);
}
#menuBtn.active .menu-line:nth-child(2) {
    opacity: 0;
}
#menuBtn.active .menu-line:nth-child(3) {
    width: 24px;
    transform: rotate(-45deg) translate(3px, -3px);
}

/* Service cards */
.service-card {
    will-change: transform;
}

/* Scroll reveal base - progressive enhancement */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
    }
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }
    .reveal-delay-5 { transition-delay: 0.5s; }
    .reveal-delay-6 { transition-delay: 0.6s; }
}

/* Back to top */
#backToTop.visible {
    opacity: 1;
    translate: 0;
    pointer-events: all;
}

/* Hero text animation on load */
@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content > * {
    animation: heroFadeIn 0.8s ease forwards;
    opacity: 0;
}

.hero-content > *:nth-child(1) { animation-delay: 0.2s; }
.hero-content > *:nth-child(2) { animation-delay: 0.4s; }
.hero-content > *:nth-child(3) { animation-delay: 0.6s; }
.hero-content > *:nth-child(4) { animation-delay: 0.8s; }
.hero-content > *:nth-child(5) { animation-delay: 1s; }

@media (prefers-reduced-motion: no-preference) {
    /* Only animate hero if user prefers motion */
}

/* Focus visible */
:focus-visible {
    outline: 2px solid #14b8a6;
    outline-offset: 2px;
}

/* Print styles */
@media print {
    nav, #backToTop, #mobileMenu { display: none; }
    body { background: white; color: black; }
    section { padding: 20px 0; }
}