/* Loading states and animations for better UX */

/* Skeleton loading animation */
@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton {
    background: linear-gradient(
        90deg,
        #f0f0f0 25%,
        #e0e0e0 50%,
        #f0f0f0 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
}

/* Lazy load transition */
.lazy-load {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.lazy-load.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Loading spinner overlay */
.loading-overlay {
    position: relative;
}

.loading-overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    z-index: 10;
    display: none;
}

.loading-overlay.is-loading::before {
    display: block;
}

/* Spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -20px;
    margin-left: -20px;
    z-index: 11;
    display: none;
}

.loading-overlay.is-loading .spinner {
    display: block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Progress bar */
.progress-bar {
    width: 100%;
    height: 4px;
    background: #f0f0f0;
    border-radius: 2px;
    overflow: hidden;
    margin: 10px 0;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
    border-radius: 2px;
}

/* Fade in animation for graphs */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.graph-container {
    animation: fadeIn 0.5s ease-out;
}

/* Optimize graph rendering performance */
.plotly,
.js-plotly-plot,
.plotly-graph-div {
    will-change: transform;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Container optimization */
.dashboard-content {
    contain: layout style paint;
}

/* Image optimization */
img {
    content-visibility: auto;
}