/* ==========================================================================
   Animations
   ========================================================================== */



/* Scroll Down Bounce */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) translateX(-50%);
    }
    40% {
        transform: translateY(-20px) translateX(-50%);
    }
    60% {
        transform: translateY(-10px) translateX(-50%);
    }
}

/* Envelope Opening Animation Classes applied via JS */
.envelope-overlay.open-transition .envelope-flap {
    transform: rotateX(180deg);
    z-index: 1;
}

.envelope-overlay.open-transition .stamp-seal {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.envelope-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-50px) scale(1.1);
}

/* Scroll Reveal Classes applied via JS IntersectionObserver */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1), transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Add delays for stagger effects on cards */
.cards-grid .reveal:nth-child(1) { transition-delay: 0.1s; }
.cards-grid .reveal:nth-child(2) { transition-delay: 0.3s; }
.cards-grid .reveal:nth-child(3) { transition-delay: 0.5s; }



.masonry-grid .reveal:nth-child(odd) { transition-delay: 0.2s; }
.masonry-grid .reveal:nth-child(even) { transition-delay: 0.4s; }

/* Background Pan/Zoom effect */
@keyframes bg-pan {
    0% {
        transform: scale(1) translate(0, 0);
    }
    50% {
        transform: scale(1.05) translate(-1%, -1%);
    }
    100% {
        transform: scale(1) translate(0, 0);
    }
}

.hero-bg {
    animation: bg-pan 30s infinite alternate ease-in-out;
}

/* ==========================================================================
   Particle System (Hearts & Flowers)
   ========================================================================== */
@keyframes floatParticle {
    0% {
        transform: translate3d(0, 0, 0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.8;
    }
    90% {
        opacity: 0.8;
    }
    100% {
        transform: translate3d(var(--x-end), var(--y-end), 0) rotate(var(--rot-end));
        opacity: 0;
    }
}

.particle {
    animation-name: floatParticle;
    will-change: transform, opacity;
}