/* ===== KEYFRAMES ===== */

/* Gradient shift for hero background */
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Glow pulse for photo */
@keyframes glow-pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.05); }
}

/* Float for particles */
@keyframes float-particle {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.15;
    }
    90% {
        opacity: 0.15;
    }
    100% {
        transform: translateY(-10vh) rotate(720deg);
        opacity: 0;
    }
}

/* Bounce for scroll indicator */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* Scroll wheel */
@keyframes scroll-wheel {
    0% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(8px); }
}

/* Fade in up */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade in left */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Fade in right */
@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scale in */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Float gentle */
@keyframes float-gentle {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Glow button pulse */
@keyframes glow-btn-pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.4), 0 0 60px rgba(102, 126, 234, 0.15);
    }
    50% {
        box-shadow: 0 0 30px rgba(102, 126, 234, 0.6), 0 0 80px rgba(102, 126, 234, 0.25);
    }
}

/* Typing cursor */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ===== SCROLL ANIMATION CLASSES ===== */

/* Initial hidden state for elements to animate in */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delay classes */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* Stack column stagger animation */
.stack-column {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out,
                border-color var(--transition), box-shadow var(--transition);
}

.stack-column.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Timeline items slide from left */
.timeline-item.animate-on-scroll {
    transform: translateX(-20px);
}

.timeline-item.animate-on-scroll.animated {
    transform: translateX(0);
}

/* Stat cards scale */
.stat-card {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out,
                background var(--transition), box-shadow var(--transition);
}

.stat-card.animated {
    opacity: 1;
    transform: scale(1);
}

/* Counter number animation placeholder */
.stat-number.counting,
.metric-value.counting {
    transition: none;
}

/* Hero content specific */
.hero .animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
}

.hero .animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

.hero .hero-photo-wrap.animate-on-scroll {
    transform: translateX(-30px);
}

.hero .hero-photo-wrap.animate-on-scroll.animated {
    transform: translateX(0);
}

.hero .hero-text.animate-on-scroll {
    transform: translateX(30px);
    transition-delay: 0.2s;
}

.hero .hero-text.animate-on-scroll.animated {
    transform: translateX(0);
}

/* Button glow pulse on visible */
.btn-glow {
    animation: glow-btn-pulse 3s ease-in-out infinite;
}

/* Nav link underline animation */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: all var(--transition);
    transform: translateX(-50%);
    border-radius: 1px;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: calc(100% - 32px);
}

/* Page load animation */
body {
    animation: pageLoad 0.5s ease-out;
}

@keyframes pageLoad {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Reduced motion preference */
@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;
    }

    .stat-card,
    .stack-column {
        opacity: 1;
        transform: none;
    }

    html {
        scroll-behavior: auto;
    }
}