/* ═══════════════════════════════════════════════════════════════
   Scroll Reveal Animations
   Clean fade-in + slide-up on scroll using IntersectionObserver
   ═══════════════════════════════════════════════════════════════ */

/* Base hidden state */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Visible state */
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays for children */
.reveal-stagger > .reveal:nth-child(1)  { transition-delay: 0s; }
.reveal-stagger > .reveal:nth-child(2)  { transition-delay: 0.07s; }
.reveal-stagger > .reveal:nth-child(3)  { transition-delay: 0.14s; }
.reveal-stagger > .reveal:nth-child(4)  { transition-delay: 0.21s; }
.reveal-stagger > .reveal:nth-child(5)  { transition-delay: 0.28s; }
.reveal-stagger > .reveal:nth-child(6)  { transition-delay: 0.35s; }

/* Direction variants */
.reveal-left {
    opacity: 0;
    transform: translateX(-40px);
    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-right {
    opacity: 0;
    transform: translateX(40px);
    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-left.is-visible,
.reveal-right.is-visible {
    opacity: 1;
    transform: translateX(0);
}

/* Scale variant */
.reveal-scale {
    opacity: 0;
    transform: scale(0.92);
    transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.reveal-scale.is-visible {
    opacity: 1;
    transform: scale(1);
}

/* Scroll progress bar */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, #2563eb, #60a5fa);
    z-index: 9999;
    pointer-events: none;
    transition: width 0.1s linear;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .reveal,
    .reveal-left,
    .reveal-right,
    .reveal-scale {
        opacity: 1;
        transform: none;
        transition: none;
    }
}