/* ============================================
   Animations — Scroll reveal, 3D, Parallax
   ============================================ */

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hero fade-up */
.animate-fade-up {
    opacity: 0;
    transform: translateY(40px);
    animation: fadeUp 0.8s ease forwards;
}
.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }
.delay-4 { animation-delay: 0.8s; }

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

/* Card hover 3D tilt */
.glass-card {
    transform-style: preserve-3d;
    perspective: 1000px;
}

/* Gradient border shimmer */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.glass-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(108, 99, 255, 0.3) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}
.glass-card:hover::after {
    opacity: 1;
    animation: shimmer 2s linear infinite;
}

/* Section reveal stagger */
.about-grid .glass-card:nth-child(1) { transition-delay: 0.1s; }
.about-grid .glass-card:nth-child(2) { transition-delay: 0.2s; }
.about-grid .glass-card:nth-child(3) { transition-delay: 0.3s; }
.about-grid .glass-card:nth-child(4) { transition-delay: 0.4s; }

.locations-grid .glass-card:nth-child(1) { transition-delay: 0.1s; }
.locations-grid .glass-card:nth-child(2) { transition-delay: 0.15s; }
.locations-grid .glass-card:nth-child(3) { transition-delay: 0.2s; }
.locations-grid .glass-card:nth-child(4) { transition-delay: 0.25s; }
.locations-grid .glass-card:nth-child(5) { transition-delay: 0.3s; }

.speakers-grid .glass-card:nth-child(1) { transition-delay: 0.05s; }
.speakers-grid .glass-card:nth-child(2) { transition-delay: 0.1s; }
.speakers-grid .glass-card:nth-child(3) { transition-delay: 0.15s; }
.speakers-grid .glass-card:nth-child(4) { transition-delay: 0.2s; }
.speakers-grid .glass-card:nth-child(5) { transition-delay: 0.25s; }
.speakers-grid .glass-card:nth-child(6) { transition-delay: 0.3s; }

/* Floating animation for decorative elements */
@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-10px) rotate(2deg); }
    66% { transform: translateY(5px) rotate(-1deg); }
}

/* Glow pulse for important elements */
@keyframes glowPulse {
    0%, 100% { filter: drop-shadow(0 0 8px rgba(108, 99, 255, 0.3)); }
    50% { filter: drop-shadow(0 0 20px rgba(108, 99, 255, 0.6)); }
}

/* Text gradient animation */
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.title-gradient, .text-gradient {
    background-size: 200% 200%;
    animation: gradientShift 4s ease infinite;
}

/* Parallax layers */
.parallax-layer {
    will-change: transform;
    transition: transform 0.1s linear;
}

/* Nav scroll transition */
.navbar {
    transition: background 0.3s ease, padding 0.3s ease, backdrop-filter 0.3s ease;
}

/* Mobile menu animation */
@keyframes menuSlide {
    from { opacity: 0; }
    to { opacity: 1; }
}

.nav-links.active {
    animation: menuSlide 0.3s ease;
}

.nav-links.active .nav-link {
    animation: fadeUp 0.4s ease forwards;
}
.nav-links.active .nav-link:nth-child(1) { animation-delay: 0.05s; }
.nav-links.active .nav-link:nth-child(2) { animation-delay: 0.1s; }
.nav-links.active .nav-link:nth-child(3) { animation-delay: 0.15s; }
.nav-links.active .nav-link:nth-child(4) { animation-delay: 0.2s; }
.nav-links.active .nav-link:nth-child(5) { animation-delay: 0.25s; }
.nav-links.active .nav-link:nth-child(6) { animation-delay: 0.3s; }
.nav-links.active .nav-link:nth-child(7) { animation-delay: 0.35s; }
.nav-links.active .nav-link:nth-child(8) { animation-delay: 0.4s; }

/* 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 { opacity: 1; transform: none; }
    .animate-fade-up { opacity: 1; transform: none; }
}