/**
 * Failproof site-wide animation library
 * -------------------------------------
 * Pair with /js/animations.js
 *
 * SCROLL REVEALS (need JS - add class, elements get .is-visible when in view)
 *   .reveal          fade + slide up
 *   .reveal-down     fade + slide down
 *   .reveal-left     fade + slide from left
 *   .reveal-right    fade + slide from right
 *   .reveal-scale    fade + slight zoom in
 *   .reveal-fade     fade only
 *   .reveal-blur     fade + unblur
 *
 * STAGGER (wrap children that have a reveal class)
 *   .stagger         children animate in sequence (80ms steps)
 *   .stagger-fast    40ms steps
 *   .stagger-slow    140ms steps
 *
 * LOAD / HERO (CSS-only - run on page load)
 *   .anim-hero-title   primary headline entrance
 *   .anim-hero-sub     supporting line (slightly delayed)
 *   .anim-hero-cta     buttons / actions (more delayed)
 *   Aliases kept for existing pages: .hero-anim-title / -sub / -cta
 *
 * CSS-ONLY LOOPS (no JS)
 *   .anim-float      gentle vertical float
 *   .anim-pulse      soft opacity pulse
 *   .anim-spin-slow  slow continuous rotate
 *
 * UTILITIES
 *   .anim-delay-1 … .anim-delay-5   extra delay (0.1s–0.5s)
 *   .anim-duration-fast / -slow     shorter / longer transitions
 *
 * DRAW / GROW (JS adds .is-visible)
 *   .anim-draw-y     scaleY 0 → 1 (e.g. timeline line via ::before)
 *
 * Respects prefers-reduced-motion.
 */

:root {
    --anim-distance: 28px;
    --anim-distance-lg: 40px;
    --anim-duration: 0.7s;
    --anim-duration-fast: 0.4s;
    --anim-duration-slow: 1s;
    --anim-ease: ease;
    --anim-stagger: 80ms;
    --anim-stagger-fast: 40ms;
    --anim-stagger-slow: 140ms;
}

/* ----- Scroll reveals ----- */
.reveal,
.reveal-down,
.reveal-left,
.reveal-right,
.reveal-scale,
.reveal-fade,
.reveal-blur {
    opacity: 0;
    transition: opacity var(--anim-duration) var(--anim-ease),
                transform var(--anim-duration) var(--anim-ease),
                filter var(--anim-duration) var(--anim-ease);
    will-change: opacity, transform;
}

.reveal {
    transform: translateY(var(--anim-distance));
}

.reveal-down {
    transform: translateY(calc(var(--anim-distance) * -1));
}

.reveal-left {
    transform: translateX(calc(var(--anim-distance-lg) * -1));
}

.reveal-right {
    transform: translateX(var(--anim-distance-lg));
}

.reveal-scale {
    transform: scale(0.94);
    transition-duration: 0.75s;
}

.reveal-fade {
    transform: none;
}

.reveal-blur {
    transform: translateY(12px);
    filter: blur(8px);
}

.reveal.is-visible,
.reveal-down.is-visible,
.reveal-left.is-visible,
.reveal-right.is-visible,
.reveal-scale.is-visible,
.reveal-fade.is-visible,
.reveal-blur.is-visible {
    opacity: 1;
    transform: none;
    filter: none;
    /* will-change on an ancestor permanently breaks backdrop-filter in browsers */
    will-change: auto;
}

/* ----- Stagger ----- */
.stagger > .reveal,
.stagger > .reveal-down,
.stagger > .reveal-left,
.stagger > .reveal-right,
.stagger > .reveal-scale,
.stagger > .reveal-fade,
.stagger > .reveal-blur {
    transition-delay: calc(var(--stagger-index, 0) * var(--anim-stagger));
}

.stagger-fast {
    --anim-stagger: var(--anim-stagger-fast);
}

.stagger-slow {
    --anim-stagger: var(--anim-stagger-slow);
}

/* ----- Load / hero entrances ----- */
.anim-hero-title,
.hero-anim-title,
.anim-hero-sub,
.hero-anim-sub,
.anim-hero-cta,
.hero-anim-cta {
    opacity: 0;
    transform: translateY(18px);
    animation: animHeroIn 0.8s var(--anim-ease) forwards;
}

.anim-hero-title,
.hero-anim-title {
    animation-delay: 0.15s;
}

.anim-hero-sub,
.hero-anim-sub {
    animation-delay: 0.35s;
}

.anim-hero-cta,
.hero-anim-cta {
    transform: translateY(14px);
    animation-duration: 0.75s;
    animation-delay: 0.55s;
}

@keyframes animHeroIn {
    to {
        opacity: 1;
        transform: none;
    }
}

/* ----- CSS-only loops ----- */
.anim-float {
    animation: animFloat 3.2s ease-in-out infinite;
}

.anim-pulse {
    animation: animPulse 2.4s ease-in-out infinite;
}

.anim-spin-slow {
    animation: animSpin 12s linear infinite;
}

@keyframes animFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes animPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.55; }
}

@keyframes animSpin {
    to { transform: rotate(360deg); }
}

/* ----- Draw / grow ----- */
.anim-draw-y {
    transform-origin: top;
    transform: scaleY(0);
    transition: transform 1s var(--anim-ease);
}

.anim-draw-y.is-visible {
    transform: scaleY(1);
}

/* Timeline draw helper (animate the ::before line) */
.anim-timeline::before {
    transform-origin: top;
    transform: scaleY(0);
    transition: transform 1s var(--anim-ease);
}

.anim-timeline.is-visible::before {
    transform: scaleY(1);
}

/* ----- Utilities ----- */
.anim-delay-1 { transition-delay: 0.1s !important; animation-delay: 0.1s !important; }
.anim-delay-2 { transition-delay: 0.2s !important; animation-delay: 0.2s !important; }
.anim-delay-3 { transition-delay: 0.3s !important; animation-delay: 0.3s !important; }
.anim-delay-4 { transition-delay: 0.4s !important; animation-delay: 0.4s !important; }
.anim-delay-5 { transition-delay: 0.5s !important; animation-delay: 0.5s !important; }

.anim-duration-fast {
    --anim-duration: var(--anim-duration-fast);
    transition-duration: var(--anim-duration-fast) !important;
    animation-duration: var(--anim-duration-fast) !important;
}

.anim-duration-slow {
    --anim-duration: var(--anim-duration-slow);
    transition-duration: var(--anim-duration-slow) !important;
    animation-duration: var(--anim-duration-slow) !important;
}

/* ----- Reduced motion ----- */
@media (prefers-reduced-motion: reduce) {
    .reveal,
    .reveal-down,
    .reveal-left,
    .reveal-right,
    .reveal-scale,
    .reveal-fade,
    .reveal-blur,
    .anim-hero-title,
    .anim-hero-sub,
    .anim-hero-cta,
    .hero-anim-title,
    .hero-anim-sub,
    .hero-anim-cta,
    .anim-float,
    .anim-pulse,
    .anim-spin-slow,
    .anim-draw-y,
    .anim-timeline::before {
        opacity: 1 !important;
        transform: none !important;
        filter: none !important;
        animation: none !important;
        transition: none !important;
    }
}