/* =====================================================
   PERFORMANCE ENHANCEMENTS - Lazy Loading & Infinite Scroll
   ===================================================== */

/* ========== BLUR PLACEHOLDER FOR IMAGES ========== */

/* Placeholder skeleton that shows before image loads */
.img-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(110deg,
            var(--bg-tertiary, #f3f4f6) 8%,
            var(--bg-secondary, #ffffff) 18%,
            var(--bg-tertiary, #f3f4f6) 33%);
    background-size: 200% 100%;
    animation: shimmer 1.5s linear infinite;
    border-radius: inherit;
    z-index: 1;
}

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

    100% {
        background-position: -200% 0;
    }
}

/* Lazy image starts invisible */
.lazy-image {
    opacity: 0;
    transition: opacity 0.4s ease-in-out;
}

/* When loaded, fade in smoothly */
.lazy-image.loaded {
    opacity: 1;
}

/* Card image container needs relative positioning */
.tool-card-v2 .card-image {
    position: relative;
    overflow: hidden;
}

/* ========== INFINITE SCROLL STYLES ========== */

/* Load More Button */
.load-more-container {
    display: flex;
    justify-content: center;
    padding: 2rem 0;
}

.load-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--color-primary, #7c3aed), #6366f1);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.load-more-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(124, 58, 237, 0.4);
}

.load-more-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.load-more-btn .spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Loading indicator for infinite scroll */
.infinite-scroll-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    gap: 1rem;
}

.infinite-scroll-loader .loader-dots {
    display: flex;
    gap: 0.5rem;
}

.infinite-scroll-loader .dot {
    width: 10px;
    height: 10px;
    background: var(--color-primary, #7c3aed);
    border-radius: 50%;
    animation: dotPulse 1.4s ease-in-out infinite;
}

.infinite-scroll-loader .dot:nth-child(2) {
    animation-delay: 0.2s;
}

.infinite-scroll-loader .dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes dotPulse {

    0%,
    80%,
    100% {
        transform: scale(0.6);
        opacity: 0.5;
    }

    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.infinite-scroll-loader .loader-text {
    color: var(--text-muted, #6b7280);
    font-size: 0.9rem;
}

/* End of results message */
.end-of-results {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted, #6b7280);
    font-size: 0.95rem;
}

.end-of-results i {
    display: block;
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

/* ========== SCROLL PROGRESS INDICATOR ========== */

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary, #7c3aed), var(--color-secondary, #14b8a6));
    z-index: 9999;
    transition: width 0.1s ease-out;
    box-shadow: 0 0 10px rgba(124, 58, 237, 0.5);
}

/* ========== DARK MODE ADJUSTMENTS ========== */

html.dark .img-placeholder {
    background: linear-gradient(110deg,
            var(--bg-tertiary, #1e293b) 8%,
            var(--bg-secondary, #0f172a) 18%,
            var(--bg-tertiary, #1e293b) 33%);
    background-size: 200% 100%;
}

html.dark .load-more-btn {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}