/**
 * PromptLab Engine v3 - High-Performance Pinterest Gallery & CSS Engine
 *
 * @package PromptLab_Engine
 * @version 3.3.0
 */

/* ==========================================
   CSS PERFORMANCE & LAYOUT CONTROLS
   ========================================== */

/* Modern Browser Rendering Containment for Virtualization */
.promptlab-grid {
    column-count: 4;
    column-gap: 16px;
    width: 100%;
    margin: 0 auto;
    contain: layout style;
}

/* ==========================================
   RESPONSIVE MASONRY GRID BREAKPOINTS
   ========================================== */

/* Desktop (>1024px): 4 Columns */
@media (min-width: 1025px) {
    .promptlab-grid {
        column-count: 4;
        column-gap: 16px;
    }
}

/* Large Tablet (768px - 1024px): 3 Columns */
@media (min-width: 768px) and (max-width: 1024px) {
    .promptlab-grid {
        column-count: 3;
        column-gap: 16px;
    }
}

/* Tablet (480px - 767px): 2 Columns */
@media (min-width: 480px) and (max-width: 767px) {
    .promptlab-grid {
        column-count: 2;
        column-gap: 16px;
    }
}

/* Mobile & Small Mobile (<480px): 2 Columns */
@media (max-width: 479px) {
    .promptlab-grid {
        column-count: 2;
        column-gap: 16px;
    }
}

/* ==========================================
   CARD DESIGN & ANIMATIONS
   ========================================== */

a.promptlab-card,
.promptlab-card {
    display: block;
    position: relative;
    width: 100%;
    margin-bottom: 16px;
    border-radius: 16px;
    overflow: hidden;
    background: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.06);
    padding: 0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease;
    text-decoration: none;
    cursor: pointer;
    break-inside: avoid;
    -webkit-column-break-inside: avoid;
    
    /* Native Browser Virtualization & Rendering Optimization */
    content-visibility: auto;
    contain-intrinsic-size: 300px;
    contain: layout paint style;
    will-change: transform, opacity;
}

/* Smooth Fade-in & Entry Animation (250ms–350ms) */
.promptlab-fade-in {
    animation: promptlab-fade-up 300ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes promptlab-fade-up {
    0% {
        opacity: 0;
        transform: translateY(16px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

a.promptlab-card:hover,
.promptlab-card:hover {
    transform: translateY(-4px) scale(1.01);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
    border-color: rgba(99, 102, 241, 0.4);
}

a.promptlab-card:focus-visible,
.promptlab-card:focus-visible {
    outline: 2px solid #6366f1;
    outline-offset: 4px;
}

/* Image Container - Aspect ratio CLS Protection */
.promptlab-card-image {
    position: relative;
    width: 100%;
    margin: 0;
    padding: 0;
    border-radius: inherit;
    overflow: hidden;
    background: #1e293b;
    display: block;
    contain: strict;
}

/* Card Image - Fill card completely with object-fit: cover */
.promptlab-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    overflow: hidden;
    border-radius: inherit;
    margin: 0;
    padding: 0;
    border: none;
    outline: none;
    opacity: 0;
    transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.promptlab-card-image img.loaded {
    opacity: 1;
}

a.promptlab-card:hover .promptlab-card-image img,
.promptlab-card:hover .promptlab-card-image img {
    transform: scale(1.04);
}

/* Fallback Placeholder */
.promptlab-card-placeholder {
    width: 100%;
    aspect-ratio: 3 / 4;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-radius: inherit;
    display: block;
}

/* SKELETON SHIMMER PLACEHOLDER */
.promptlab-skeleton-shimmer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    background: #1e293b;
    background-image: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.06) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    background-size: 200% 100%;
    animation: promptlab-shimmer 1.4s infinite linear;
    transition: opacity 0.3s ease;
    border-radius: inherit;
    pointer-events: none;
}

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

/* Offscreen Virtualization Detached Placeholder State */
.promptlab-card.is-offscreen {
    content-visibility: hidden;
}

/* ==========================================
   GOOGLE ADSENSE CONTAINER (SINGLE PROMPT PAGE ONLY)
   ========================================== */

.promptlab-adsense-wrapper {
    position: relative;
    width: 100%;
    min-height: 250px;
    margin: 24px 0;
    padding: 0;
    overflow: hidden;
    background: rgba(15, 23, 42, 0.4);
    border-radius: 14px;
    box-sizing: border-box;
    contain: layout style paint;
    contain-intrinsic-size: 250px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.promptlab-adsense-wrapper ins.adsbygoogle {
    width: 100%;
    min-height: 250px;
    display: block;
}

/* ==========================================
   LOADING SPINNER & CONTROL STATES
   ========================================== */

.promptlab-sentinel {
    width: 100%;
    height: 20px;
    margin-top: 20px;
    visibility: hidden;
    pointer-events: none;
}

.promptlab-spinner-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 30px 0;
    width: 100%;
}

.promptlab-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(99, 102, 241, 0.2);
    border-top-color: #6366f1;
    border-radius: 50%;
    animation: promptlab-spin 0.8s infinite linear;
}

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

/* ==========================================
   END OF RESULTS DIVIDER
   ========================================== */

.promptlab-end-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    width: 100%;
    max-width: 500px;
    margin: 40px auto;
    padding: 0 16px;
    color: #94a3b8;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.3px;
    text-align: center;
}

.promptlab-end-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, rgba(148, 163, 184, 0) 0%, rgba(148, 163, 184, 0.25) 50%, rgba(148, 163, 184, 0) 100%);
}

.promptlab-end-text {
    flex-shrink: 0;
}

/* ==========================================
   ERROR & RETRY CONTAINER
   ========================================== */

.promptlab-error-container {
    text-align: center;
    padding: 24px;
    margin: 20px auto;
    max-width: 400px;
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 12px;
    color: #f87171;
}

.promptlab-error-msg {
    margin: 0 0 12px 0;
    font-size: 14px;
    font-weight: 500;
}

.promptlab-retry-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 20px;
    background: #ef4444;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

.promptlab-retry-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.promptlab-retry-btn:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

/* ==========================================
   SINGLE PROMPT PAGE & RELATED SHOWCASE
   ========================================== */

.promptlab-single-showcase {
    position: relative;
    width: 100%;
    margin: 0 0 24px 0;
    padding: 0;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
    background: transparent;
    line-height: 0;
}

.promptlab-large-img {
    width: 100%;
    height: auto;
    max-height: 750px;
    object-fit: cover;
    display: block;
    margin: 0;
    padding: 0;
    border: none;
    border-radius: inherit;
    overflow: hidden;
}

/* RELATED PROMPTS SECTION */
.promptlab-related-section {
    margin-top: 30px;
}

.promptlab-related-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #f8fafc;
}

/* ==========================================
   DYNAMIC CATEGORY NAVIGATION STYLING
   ========================================== */

.promptlab-quick-nav.promptlab-category-nav {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
    overflow-x: auto;
    overflow-y: hidden;
    flex-wrap: nowrap;
    white-space: nowrap;
    padding: 6px 4px 12px 4px;
    width: 100%;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    position: sticky;
    top: 10px;
    z-index: 15;
    background: transparent;
}

.promptlab-quick-nav.promptlab-category-nav::-webkit-scrollbar {
    display: none;
}

.promptlab-quick-nav.promptlab-category-nav .promptlab-chip {
    display: inline-flex;
    align-items: center;
    padding: 8px 20px;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.08);
    color: #cbd5e1;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.2px;
    flex-shrink: 0;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.promptlab-quick-nav.promptlab-category-nav .promptlab-chip:hover {
    background: rgba(255, 255, 255, 0.18);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.promptlab-quick-nav.promptlab-category-nav .promptlab-chip.active {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color: #ffffff;
    font-weight: 700;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.45);
    transform: translateY(-1px);
}

/* ==========================================
   ACCESSIBILITY & PREFERS-REDUCED-MOTION
   ========================================== */

@media (prefers-reduced-motion: reduce) {
    a.promptlab-card,
    .promptlab-card,
    .promptlab-card-image img,
    .promptlab-quick-nav.promptlab-category-nav .promptlab-chip,
    .promptlab-retry-btn {
        transition: none !important;
        animation: none !important;
    }
    .promptlab-skeleton-shimmer {
        animation: none !important;
    }
}