/**
 * Advanced Ad Optimization Styles for Math Help
 * Phase 5: Premium Ad Integration
 * 
 * Optimized for:
 * - Maximum viewability
 * - Minimal layout shift
 * - Premium ad network compatibility
 * - A/B testing variants
 */

/* Base ad container optimizations */
.ad-container {
    position: relative;
    margin: 20px 0;
    padding: 10px;
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 4px;
    min-height: 250px; /* Prevent layout shift */
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.ad-container::before {
    content: "Advertisement";
    position: absolute;
    top: 5px;
    left: 10px;
    font-size: 11px;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Enhanced ad container states */
.ad-container.loaded {
    background-color: transparent;
    border: none;
    padding: 0;
}

.ad-container.error {
    background-color: #fff3cd;
    border-color: #ffeaa7;
}

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

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

/* Position-specific optimizations */

/* Header ads - optimized for leaderboard */
.ad-container.ad-top {
    margin: 15px 0 25px 0;
    min-height: 90px;
    max-height: 280px;
}

.ad-container.ad-top.variant-leaderboard {
    min-height: 90px;
    max-width: 728px;
    margin: 15px auto 25px auto;
}

.ad-container.ad-top.variant-banner {
    min-height: 60px;
    max-width: 468px;
    margin: 15px auto 25px auto;
}

.ad-container.ad-top.variant-responsive {
    min-height: 90px;
    width: 100%;
}

/* Sidebar ads - optimized for skyscraper and rectangles */
.ad-container.ad-sidebar {
    margin: 20px 0;
    width: 100%;
    min-height: 600px;
}

.ad-container.ad-sidebar.variant-skyscraper {
    min-height: 600px;
    max-width: 160px;
}

.ad-container.ad-sidebar.variant-rectangle {
    min-height: 250px;
    max-width: 300px;
}

.ad-container.ad-sidebar.sticky {
    position: sticky;
    top: 20px;
    z-index: 100;
}

/* Content ads - optimized for native and squares */
.ad-container.in-content {
    margin: 30px auto;
    max-width: 600px;
    min-height: 250px;
}

.ad-container.in-content.variant-square {
    min-height: 250px;
    max-width: 250px;
}

.ad-container.in-content.variant-rectangle {
    min-height: 250px;
    max-width: 300px;
}

.ad-container.in-content.variant-native {
    min-height: 150px;
    max-width: 100%;
    background: transparent;
    border: none;
}

/* Footer ads */
.ad-container.ad-bottom {
    margin: 30px 0 20px 0;
    min-height: 90px;
}

.ad-container.ad-bottom.variant-leaderboard {
    min-height: 90px;
    max-width: 728px;
    margin: 30px auto 20px auto;
}

.ad-container.ad-bottom.variant-responsive {
    min-height: 90px;
    width: 100%;
}

/* Auto-relaxed and matched content ads */
.ad-container.ad-autorelaxed {
    min-height: 300px;
    margin: 40px 0;
    background: transparent;
    border: none;
}

/* AdSense specific optimizations */
.adsbygoogle {
    display: block !important;
    width: 100%;
    height: 100%;
    min-height: inherit;
}

/* Lazy loading states */
.ad-container[data-lazy-loaded="false"] {
    background: #f5f5f5;
}

.ad-container[data-lazy-loaded="true"] .adsbygoogle {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.ad-container.loaded[data-lazy-loaded="true"] .adsbygoogle {
    opacity: 1;
}

/* Viewability optimization */
.ad-container[data-visible="true"] {
    border-color: #28a745;
    box-shadow: 0 0 5px rgba(40, 167, 69, 0.3);
}

/* Premium ad network preparations */

/* Ezoic placeholder styles */
.ezoic-ad {
    min-height: 250px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    border-radius: 8px;
}

.ezoic-ad::before {
    content: "Premium Ad Space";
    font-size: 14px;
}

/* AdThrive placeholder styles */
.adthrive-ad {
    min-height: 250px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    border-radius: 8px;
}

/* Mediavine placeholder styles */
.mediavine-ad {
    min-height: 250px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    border-radius: 8px;
}

/* A/B Testing visual indicators (only visible in debug mode) */
body.debug-ads .ad-container::after {
    content: attr(data-variant);
    position: absolute;
    top: 5px;
    right: 10px;
    background: #007bff;
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
}

/* Core Web Vitals optimizations */

/* Minimize Cumulative Layout Shift (CLS) */
.ad-container {
    contain: layout style paint;
    will-change: contents;
}

/* Improve Largest Contentful Paint (LCP) */
.ad-container img,
.ad-container iframe {
    max-width: 100%;
    height: auto;
    loading: lazy;
}

/* Responsive design optimizations */
@media (max-width: 768px) {
    .ad-container.ad-sidebar {
        min-height: 250px;
        max-width: 320px;
        margin: 20px auto;
    }
    
    .ad-container.ad-top,
    .ad-container.ad-bottom {
        min-height: 50px;
        max-width: 320px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .ad-container.in-content {
        max-width: 320px;
        margin: 20px auto;
    }
    
    /* Mobile-specific ad variants */
    .ad-container.variant-leaderboard {
        min-height: 50px;
        max-width: 320px;
    }
    
    .ad-container.variant-skyscraper {
        min-height: 250px;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .ad-container {
        margin: 15px 10px;
        min-height: 200px;
    }
    
    .ad-container.ad-top,
    .ad-container.ad-bottom {
        min-height: 50px;
        margin: 15px auto;
    }
}

/* Print media - hide ads */
@media print {
    .ad-container,
    .ezoic-ad,
    .adthrive-ad,
    .mediavine-ad {
        display: none !important;
    }
}

/* Dark mode support for ad containers */
@media (prefers-color-scheme: dark) {
    .ad-container {
        background-color: #2d3748;
        border-color: #4a5568;
    }
    
    .ad-container::before {
        color: #a0aec0;
    }
    
    .ad-container.loading {
        background: linear-gradient(90deg, #2d3748 25%, #4a5568 50%, #2d3748 75%);
        background-size: 200% 100%;
    }
}

/* Accessibility improvements */
.ad-container {
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.ad-container:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* Performance monitoring indicators */
.ad-container.slow-loading {
    border-left: 4px solid #ffc107;
}

.ad-container.failed-loading {
    border-left: 4px solid #dc3545;
    background: linear-gradient(45deg, transparent 40%, rgba(220, 53, 69, 0.1) 50%, transparent 60%);
}

/* Revenue optimization hints */
.ad-container.high-value {
    box-shadow: 0 0 10px rgba(40, 167, 69, 0.4);
}

.ad-container.low-value {
    opacity: 0.8;
}

/* Ad blocker detection styles */
.ad-container.blocked {
    background: #ffe6e6;
    border-color: #ffcccc;
    min-height: 100px;
}

.ad-container.blocked::after {
    content: "Please consider disabling your ad blocker to support Math Help";
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 14px;
    line-height: 1.4;
}

/* Enhanced Mobile Ad Optimizations for Revenue Maximization */
@media (max-width: 768px) {
    /* Mobile sticky bottom ad for maximum revenue */
    .ad-mobile-sticky {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: white;
        box-shadow: 0 -2px 15px rgba(0,0,0,0.1);
        z-index: 50;
        padding: 8px;
        text-align: center;
        border-top: 1px solid #e0e0e0;
        min-height: 60px;
        max-height: 90px;
    }
    
    /* Native-style mobile ads for better integration */
    .ad-container.ad-native {
        background: transparent;
        border: none;
        padding: 0;
        margin: 25px 0;
        min-height: 150px;
    }
    
    /* Enhanced mobile in-content ads */
    .ad-container.ad-middle {
        background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
        border: 1px solid #dee2e6;
        border-radius: 12px;
        padding: 15px;
        margin: 30px 0;
        box-shadow: 0 3px 10px rgba(0,0,0,0.08);
    }
    
    /* Better mobile ad placeholders */
    .ad-placeholder {
        min-height: 90px;
        background: linear-gradient(135deg, #f1f3f4 0%, #e8eaed 100%);
        border: 1px dashed #dadce0;
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.8rem;
        color: #5f6368;
        font-weight: 500;
    }
    
    /* Mobile-friendly close button for sticky ads */
    .ad-close-btn {
        position: absolute;
        top: 8px;
        right: 8px;
        background: rgba(0,0,0,0.6);
        color: white;
        border: none;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        font-size: 14px;
        cursor: pointer;
        display: none;
        font-weight: bold;
        line-height: 1;
        z-index: 51;
    }
    
    .ad-mobile-sticky .ad-close-btn {
        display: block;
    }
    
    /* Optimize ad density for mobile UX */
    .ad-container.ad-middle:nth-of-type(n+3) {
        display: none; /* Hide excessive middle ads */
    }
    
    /* Mobile content padding adjustments */
    .main-content {
        padding-bottom: 80px; /* Space for sticky ad */
    }
    
    /* Mobile banner ad optimization */
    .ad-container.ad-top {
        background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
        padding: 12px;
        margin: 15px 0;
        border-radius: 10px;
        min-height: 60px;
        max-height: 100px;
    }
    
    /* Mobile sidebar replacement - horizontal scroll */
    .ad-container.ad-sidebar-mobile {
        display: flex;
        overflow-x: auto;
        gap: 15px;
        padding: 15px 0;
        margin: 20px 0;
        background: #f8f9fa;
        border-radius: 10px;
        -webkit-overflow-scrolling: touch;
    }
    
    .ad-container.ad-sidebar-mobile .ad-item {
        flex: 0 0 280px;
        min-height: 150px;
        background: white;
        border-radius: 8px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }
}