/* ========================================
   SCROLL ANIMATIONS & LOADING STATES
   Smooth fade-in animations on scroll
   ======================================== */

/* Loading state for page */
.page-loading {
    opacity: 0;
    transition: opacity 0.5s ease;
}

.page-loaded {
    opacity: 1;
}

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

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

/* Staggered animation delays */
.scroll-reveal:nth-child(1) { transition-delay: 0.1s; }
.scroll-reveal:nth-child(2) { transition-delay: 0.2s; }
.scroll-reveal:nth-child(3) { transition-delay: 0.3s; }
.scroll-reveal:nth-child(4) { transition-delay: 0.4s; }
.scroll-reveal:nth-child(5) { transition-delay: 0.5s; }
.scroll-reveal:nth-child(6) { transition-delay: 0.6s; }

/* Fade in from different directions */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.revealed {
    opacity: 1;
    transform: translateY(0);
}

.fade-down {
    opacity: 0;
    transform: translateY(-40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-down.revealed {
    opacity: 1;
    transform: translateY(0);
}

.fade-left {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-left.revealed {
    opacity: 1;
    transform: translateX(0);
}

.fade-right {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-right.revealed {
    opacity: 1;
    transform: translateX(0);
}

/* Scale animations */
.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.scale-in.revealed {
    opacity: 1;
    transform: scale(1);
}

/* Loading spinner for forms */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}

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

/* Button loading state */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::after {
    content: '';
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}

/* Skeleton loading for content */
.skeleton {
    background: linear-gradient(90deg, 
        rgba(255, 255, 255, 0.05) 25%, 
        rgba(255, 255, 255, 0.1) 50%, 
        rgba(255, 255, 255, 0.05) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
}

.skeleton-title {
    height: 2em;
    width: 60%;
    margin-bottom: 1em;
}

/* Pulse animation for emphasis */
@keyframes pulse-glow {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .scroll-reveal,
    .fade-up,
    .fade-down,
    .fade-left,
    .fade-right,
    .scale-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
    
    .loading-spinner,
    .btn-loading::after {
        animation: none;
    }
}