/* =====================================================
   ChatNexus Scroll Reveal Animations
   Clean, professional scroll-triggered animations
   ===================================================== */

/* ===== CSS Custom Properties ===== */
:root {
    --scroll-duration: 0.8s;
    --scroll-timing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --scroll-delay-step: 0.1s;
}

/* ===== Base Scroll Animation States ===== */
.scroll-reveal {
    opacity: 0;
    transform: translateY(60px);
    transition: 
        opacity var(--scroll-duration) var(--scroll-timing),
        transform var(--scroll-duration) var(--scroll-timing);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Staggered Children ===== */
.scroll-reveal-stagger > * {
    opacity: 0;
    transform: translateY(40px);
    transition: 
        opacity 0.6s var(--scroll-timing),
        transform 0.6s var(--scroll-timing);
}

.scroll-reveal-stagger.revealed > *:nth-child(1) { transition-delay: 0s; }
.scroll-reveal-stagger.revealed > *:nth-child(2) { transition-delay: 0.1s; }
.scroll-reveal-stagger.revealed > *:nth-child(3) { transition-delay: 0.2s; }
.scroll-reveal-stagger.revealed > *:nth-child(4) { transition-delay: 0.3s; }
.scroll-reveal-stagger.revealed > *:nth-child(5) { transition-delay: 0.4s; }
.scroll-reveal-stagger.revealed > *:nth-child(6) { transition-delay: 0.5s; }
.scroll-reveal-stagger.revealed > *:nth-child(7) { transition-delay: 0.6s; }
.scroll-reveal-stagger.revealed > *:nth-child(8) { transition-delay: 0.7s; }

.scroll-reveal-stagger.revealed > * {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Section-Level Animations ===== */
section.scroll-section {
    opacity: 0;
    transform: translateY(80px);
    transition: 
        opacity var(--scroll-duration) var(--scroll-timing),
        transform var(--scroll-duration) var(--scroll-timing);
}

section.scroll-section.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Fade In Variants ===== */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
}

.fade-up.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: 
        opacity 0.6s var(--scroll-timing),
        transform 0.6s var(--scroll-timing);
}

.fade-in {
    opacity: 0;
}

.fade-in.revealed {
    opacity: 1;
    transition: opacity 0.8s var(--scroll-timing);
}

/* ===== Scale Up Animation ===== */
.scale-up {
    opacity: 0;
    transform: scale(0.9);
}

.scale-up.revealed {
    opacity: 1;
    transform: scale(1);
    transition: 
        opacity 0.6s var(--scroll-timing),
        transform 0.6s var(--scroll-timing);
}

/* ===== Slide From Left/Right ===== */
.slide-left {
    opacity: 0;
    transform: translateX(-60px);
}

.slide-left.revealed {
    opacity: 1;
    transform: translateX(0);
    transition: 
        opacity 0.7s var(--scroll-timing),
        transform 0.7s var(--scroll-timing);
}

.slide-right {
    opacity: 0;
    transform: translateX(60px);
}

.slide-right.revealed {
    opacity: 1;
    transform: translateX(0);
    transition: 
        opacity 0.7s var(--scroll-timing),
        transform 0.7s var(--scroll-timing);
}

/* ===== Card Grid Stagger ===== */
.card-grid {
    display: grid;
}

.card-grid > .card-item {
    opacity: 0;
    transform: translateY(30px);
    transition: 
        opacity 0.5s var(--scroll-timing),
        transform 0.5s var(--scroll-timing);
}

.card-grid.revealed > .card-item:nth-child(1) { transition-delay: 0s; }
.card-grid.revealed > .card-item:nth-child(2) { transition-delay: 0.08s; }
.card-grid.revealed > .card-item:nth-child(3) { transition-delay: 0.16s; }
.card-grid.revealed > .card-item:nth-child(4) { transition-delay: 0.24s; }
.card-grid.revealed > .card-item:nth-child(5) { transition-delay: 0.32s; }
.card-grid.revealed > .card-item:nth-child(6) { transition-delay: 0.40s; }
.card-grid.revealed > .card-item:nth-child(7) { transition-delay: 0.48s; }
.card-grid.revealed > .card-item:nth-child(8) { transition-delay: 0.56s; }

.card-grid.revealed > .card-item {
    opacity: 1;
    transform: translateY(0);
}

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

/* ===== Reduced Motion Support ===== */
@media (prefers-reduced-motion: reduce) {
    .scroll-reveal,
    .scroll-reveal-stagger > *,
    section.scroll-section,
    .fade-up,
    .fade-in,
    .scale-up,
    .slide-left,
    .slide-right,
    .card-grid > .card-item {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
}