/* ═══════════════════════════════════════════════════════════
   ANIMATION SYSTEM
   Scroll-reveal animations using CSS + IntersectionObserver
   ═══════════════════════════════════════════════════════════ */

/* ── Animation Timing ──────────────────────────────────────── */
:root {
    --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 0.3s;
    --duration-normal: 0.5s;
    --duration-slow: 0.7s;
}

/* ── Fade In ───────────────────────────────────────────────── */
.fade-in {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity var(--duration-normal) var(--ease),
                transform var(--duration-normal) var(--ease);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-fast {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--duration-fast) var(--ease),
                transform var(--duration-fast) var(--ease);
}

.fade-in-fast.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Reveal (scroll-triggered fade up) ────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity var(--duration-normal) var(--ease),
                transform var(--duration-normal) var(--ease);
}

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

/* ── Stagger (for lists/grids) ────────────────────────────── */
.stagger-item {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.45s var(--ease),
                transform 0.45s var(--ease);
}

.stagger-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays */
.stagger-item:nth-child(1) { transition-delay: 0s; }
.stagger-item:nth-child(2) { transition-delay: 0.07s; }
.stagger-item:nth-child(3) { transition-delay: 0.14s; }
.stagger-item:nth-child(4) { transition-delay: 0.21s; }
.stagger-item:nth-child(5) { transition-delay: 0.28s; }
.stagger-item:nth-child(6) { transition-delay: 0.35s; }
.stagger-item:nth-child(7) { transition-delay: 0.42s; }
.stagger-item:nth-child(8) { transition-delay: 0.49s; }
.stagger-item:nth-child(9) { transition-delay: 0.56s; }
.stagger-item:nth-child(10) { transition-delay: 0.63s; }

/* ── Line Reveal (horizontal grow) ────────────────────────── */
.line-reveal {
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--duration-slow) var(--ease-out);
}

.line-reveal.visible {
    transform: scaleX(1);
}

/* ── Page Transition ───────────────────────────────────────── */
.page-transition {
    animation: pageEnter var(--duration-fast) var(--ease-out);
}

@keyframes pageEnter {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Backdrop Blur Support ─────────────────────────────────── */
.backdrop-blur {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

@supports not (backdrop-filter: blur(12px)) {
    .backdrop-blur {
        background-color: rgba(250, 250, 248, 0.95) !important;
    }
}

/* ── Smooth Scroll ─────────────────────────────────────────── */
html {
    scroll-behavior: smooth;
}

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