*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    overflow-x: hidden;
}

/* Preloader */
#preloader {
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#preloader.fade-out {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Floating animations */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes float-slow {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-6px); }
}

.animate-float {
    animation: float 4s ease-in-out infinite;
}

.animate-float-slow {
    animation: float-slow 5s ease-in-out infinite;
}

/* Scroll reveal — progressive enhancement via JS */
.scroll-reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

/* Mobile menu */
#mobile-menu.open {
    display: flex;
}

#mobile-menu.hidden {
    display: none;
}

/* Header scroll state */
.header-scrolled {
    background: rgba(240, 244, 248, 0.95) !important;
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}

/* Back to top */
#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f0f4f8;
}
::-webkit-scrollbar-thumb {
    background: #9fb3c8;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #6b7b8c;
}

/* Focus styles */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline: 2px solid #4ade80;
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
    .scroll-reveal {
        opacity: 1;
        transform: none;
    }
}