/* CLS Optimization Utilities */

/* Image loading optimization */
.img-placeholder {
    background: #f5f5f5 url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><rect width="40" height="40" fill="%23ddd"/><text x="50%" y="50%" font-size="12" text-anchor="middle" dy=".3em" fill="%23999">📷</text></svg>') center/contain no-repeat;
    display: block;
    position: relative;
}

.img-placeholder::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Video containers with proper aspect ratios */
.video-16-9 {
    aspect-ratio: 16/9;
    position: relative;
    overflow: hidden;
    contain: layout;
}

.video-4-3 {
    aspect-ratio: 4/3;
    position: relative;
    overflow: hidden;
    contain: layout;
}

/* Carousel/slider stabilization */
.carousel-container {
    position: relative;
    contain: layout;
    overflow: hidden;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.carousel-slide.active {
    opacity: 1;
    position: relative;
}

/* Modal and popup prevention */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    contain: layout;
}

/* Form field stabilization */
.form-group {
    margin-bottom: 1rem;
    position: relative;
    contain: layout;
}

.form-control {
    display: block;
    width: 100%;
    min-height: 44px;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 16px; /* Prevents zoom on iOS */
}

/* Speaker grid optimization */
.speaker-card {
    position: relative;
    contain: layout;
    aspect-ratio: 1;
    overflow: hidden;
}

.speaker-card img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    object-position: top center;
}

/* Partner logos stabilization */
.partner-logo {
    width: 120px;
    height: 60px;
    object-fit: contain;
    object-position: center;
    background: #f9f9f9;
}

/* Button group stabilization */
.btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.btn-group .btn {
    flex-shrink: 0;
    white-space: nowrap;
}

/* Newsletter signup prevention */
.newsletter-form {
    position: relative;
    contain: layout;
}

.newsletter-form .form-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

/* Responsive breakpoints with stable transitions */
@media (max-width: 768px) {
    .hero-section {
        min-height: 50vh;
    }
    
    .btn-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .newsletter-form .form-row {
        flex-direction: column;
        gap: 15px;
    }
}

/* Animation performance optimization */
.animate-in {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Prevent flash of unstyled content */
.no-js .animate-in {
    animation: none;
    opacity: 1;
    transform: none;
}

/* Table responsiveness without CLS */
.table-responsive {
    position: relative;
    contain: layout;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table-responsive table {
    min-width: 600px;
    width: 100%;
}

/* Footer stabilization */
.footer {
    contain: layout;
    margin-top: auto;
}

/* Critical content prioritization */
.above-fold {
    contain: layout;
    position: relative;
}

.below-fold {
    contain: layout;
}

/* Loading states for dynamic content */
.content-loading {
    min-height: 200px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 37%, #f0f0f0 63%);
    background-size: 400% 100%;
    animation: loading-shimmer 1.5s ease-in-out infinite;
    border-radius: 4px;
}

@keyframes loading-shimmer {
    0% { background-position: 100% 50%; }
    100% { background-position: -100% 50%; }
}

/* Intersection Observer ready classes */
.lazy-load {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

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

/* Cookie banner stabilization */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    contain: layout;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.cookie-banner.show {
    transform: translateY(0);
}