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

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

body {
    margin: 0;
    overflow-x: hidden;
}

::selection {
    background-color: rgba(63, 173, 119, 0.2);
    color: #0f2a48;
}

/* Scroll-triggered reveal animations */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94), 
                transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal[data-reveal-state="hidden"] {
    opacity: 0;
    transform: translateY(24px);
}

.reveal[data-reveal-state="visible"] {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delays for grid items */
.reveal[data-reveal-delay="1"] { transition-delay: 0.1s; }
.reveal[data-reveal-delay="2"] { transition-delay: 0.2s; }
.reveal[data-reveal-delay="3"] { transition-delay: 0.3s; }
.reveal[data-reveal-delay="4"] { transition-delay: 0.4s; }
.reveal[data-reveal-delay="5"] { transition-delay: 0.5s; }

/* Scroll down animation */
@keyframes scrollDown {
    0% { transform: translateY(-100%); }
    50% { transform: translateY(200%); }
    100% { transform: translateY(200%); }
}

.animate-scroll-down {
    animation: scrollDown 1.5s ease-in-out infinite;
}

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

/* Mobile menu transitions */
#mobileMenu {
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

#mobileMenu.open {
    opacity: 1;
    pointer-events: all;
}

#mobileMenu.closed {
    opacity: 0;
    pointer-events: none;
}

/* Nav text color transitions */
.nav-text {
    transition: color 0.3s ease;
}

.nav-link {
    transition: color 0.3s ease;
}

/* Mobile link transitions */
.mobile-link {
    transition: color 0.3s ease, transform 0.3s ease;
}

.mobile-link:active {
    transform: scale(0.97);
}

/* Menu button animation */
.menu-line {
    transition: transform 0.3s ease, opacity 0.3s ease;
}

#menuBtn.active .menu-line:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
}

#menuBtn.active .menu-line:nth-child(2) {
    opacity: 0;
}

#menuBtn.active .menu-line:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
}

/* Image loading placeholder */
img {
    background-color: #f4f8fb;
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #3fad77;
    outline-offset: 2px;
    border-radius: 4px;
}