/* ================================================
   ANIMATIONS — Scroll effects, transitions, keyframes
   ================================================ */

/* Scroll-triggered fade in + slide up */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.stagger-children > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 100ms; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 200ms; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 300ms; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 400ms; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 500ms; }
.stagger-children.visible > *:nth-child(7) { transition-delay: 600ms; }
.stagger-children.visible > *:nth-child(8) { transition-delay: 700ms; }
.stagger-children.visible > *:nth-child(9) { transition-delay: 800ms; }

.stagger-children.visible > * {
    opacity: 1;
    transform: translateY(0);
}

/* Slide in from left */
.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Slide in from right */
.slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Scale up */
.scale-up {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.scale-up.visible {
    opacity: 1;
    transform: scale(1);
}

/* Hero text entrance */
.hero-text-enter {
    opacity: 0;
    transform: translateY(20px);
    animation: heroTextIn 0.8s var(--ease-out) forwards;
}

.hero-text-enter:nth-child(1) { animation-delay: 0.2s; }
.hero-text-enter:nth-child(2) { animation-delay: 0.4s; }
.hero-text-enter:nth-child(3) { animation-delay: 0.6s; }
.hero-text-enter:nth-child(4) { animation-delay: 0.8s; }

@keyframes heroTextIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll progress bar animation (driven by JS) */
.scroll-progress {
    transform-origin: left;
    transition: none;
}

/* Parallax helper */
.parallax-bg {
    will-change: transform;
}

/* Button hover pulse */
.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

/* Image loading placeholder */
.img-placeholder {
    background: var(--bg-accent);
    animation: imgPulse 2s ease-in-out infinite;
}

@keyframes imgPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .animate-on-scroll,
    .stagger-children > *,
    .slide-in-left,
    .slide-in-right,
    .scale-up {
        opacity: 1;
        transform: none;
    }

    .hero-text-enter {
        opacity: 1;
        transform: none;
    }
}