/* Mobile PageSpeed Optimizations - Based on Mobile Test Results */
/* Addresses specific Mobile performance issues from PageSpeed Insights */

/* Remove unused CSS - Critical for mobile performance */
@media screen and (max-width: 768px) {
    /* Hide desktop-only elements to reduce CSS payload */
    .d-none.d-md-block,
    .desktop-only {
        display: none !important;
    }
    
    /* Optimize CloudFlare CDN resources */
    .cloudflare-insights {
        display: none;
    }
}

/* First Contentful Paint optimization for mobile */
@media screen and (max-width: 480px) {
    /* Critical above-the-fold content */
    body {
        font-size: 14px;
        line-height: 1.4;
        margin: 0;
        padding: 0;
    }
    
    /* Navbar mobile optimization */
    .navbar {
        height: 56px; /* Smaller on mobile */
        padding: 0.25rem 0.5rem;
        min-height: 56px;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
        padding: 0.25rem 0;
    }
    
    /* Container mobile optimization */
    .container,
    .container-fluid {
        padding-left: 8px;
        padding-right: 8px;
        margin-left: auto;
        margin-right: auto;
    }
    
    /* Hero section mobile optimization */
    .hero-section {
        min-height: 250px; /* Reduced for mobile */
        padding: 1.5rem 0;
    }
    
    .display-4 {
        font-size: 2rem; /* Smaller on mobile */
    }
    
    /* Properly sized main heading icon for mobile devices */
    .display-4 .bi-arrow-repeat {
        font-size: 1.1em !important;
        margin-right: 0.3em !important;
        vertical-align: baseline !important;
    }
    
    .display-4-original {
        font-size: 1.8rem; /* Smaller heading on mobile */
        margin-bottom: 1rem;
    }
    
    .lead {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    /* Upload area mobile optimization - critical for CLS */
    .upload-area,
    .drag-drop-area,
    .drop-zone {
        min-height: 200px; /* Optimized for mobile screens */
        padding: 1rem;
        border-width: 2px;
        font-size: 0.9rem;
    }
    
    /* Button mobile optimization */
    .btn {
        min-height: 42px; /* Touch-friendly size */
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .btn-lg {
        min-height: 48px;
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    /* Conversion cards mobile optimization */
    .conversion-card {
        height: auto;
        min-height: 180px; /* Smaller on mobile */
        margin-bottom: 1rem;
        border-radius: 8px;
    }
    
    .conversion-card-body {
        padding: 1rem;
    }
    
    .conversion-card h5 {
        font-size: 1.1rem;
        margin-bottom: 0.75rem;
    }
    
    .conversion-card p {
        font-size: 0.85rem;
        margin-bottom: 1rem;
    }
    
    /* FAQ section mobile optimization */
    .faq-section {
        min-height: 300px;
        padding: 2rem 0;
    }
    
    .faq-card {
        min-height: 140px; /* Smaller on mobile */
        padding: 1rem;
        margin-bottom: 1rem;
        border-radius: 8px;
    }
    
    .faq-card h5 {
        font-size: 1rem;
        margin-bottom: 0.75rem;
    }
    
    .faq-card p {
        font-size: 0.85rem;
        line-height: 1.4;
    }
    
    /* Donation section mobile optimization */
    .donation-section {
        min-height: 120px; /* Smaller on mobile */
        padding: 1.5rem 0;
    }
    
    .donation-section h3 {
        font-size: 1.3rem;
        margin-bottom: 0.75rem;
    }
    
    .donation-section p {
        font-size: 0.9rem;
        margin-bottom: 1rem;
    }
    
    .paypal-button-container {
        min-height: 44px;
        max-width: 180px;
    }
    
    .paypal-donation-button {
        height: 40px;
        font-size: 13px;
        padding: 6px 12px;
    }
    
    /* Footer mobile optimization */
    .footer {
        min-height: 80px; /* Smaller footer on mobile */
        padding: 1.5rem 0;
    }
    
    .footer p {
        font-size: 0.8rem;
        margin-bottom: 0.5rem;
    }
    
    .footer a {
        font-size: 0.8rem;
        margin-right: 1rem !important;
        display: inline-block;
        margin-bottom: 0.5rem;
    }
    
    /* Dropdown menu mobile optimization */
    .dropdown-menu {
        min-width: 250px;
        max-width: 90vw;
        font-size: 0.9rem;
        z-index: 1050; /* Higher than upload area */
        position: absolute;
        background-color: var(--bs-dark, #343a40);
        border: 1px solid var(--bs-secondary, #6c757d);
        border-radius: 8px;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    }
    
    .dropdown-item {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .dropdown-header {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }
    
    /* Language selector mobile optimization */
    .nav-link {
        padding: 0.5rem;
        font-size: 1.1rem;
    }
    
    /* Row and column mobile optimization */
    .row {
        margin-right: -8px;
        margin-left: -8px;
    }
    
    .col,
    .col-12,
    .col-md-6,
    .col-lg-4 {
        padding-right: 8px;
        padding-left: 8px;
    }
    
    /* Image optimization for mobile */
    img {
        max-width: 100%;
        height: auto;
        vertical-align: middle;
    }
    
    /* Logo mobile optimization */
    .navbar-brand img {
        height: 28px; /* Smaller logo on mobile */
        width: auto;
    }
    
    /* Form elements mobile optimization */
    .form-control {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: 0.5rem 0.75rem;
        min-height: 42px;
    }
    
    .form-select {
        font-size: 16px;
        padding: 0.5rem 2rem 0.5rem 0.75rem;
        min-height: 42px;
    }
    
    /* Cookie banner mobile optimization */
    .cookie-banner {
        font-size: 0.85rem;
        padding: 1rem 0;
    }
    
    .cookie-banner .btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
        margin: 0.25rem;
    }
    
    /* Progress elements mobile optimization */
    .progress {
        height: 0.75rem;
        margin-bottom: 1rem;
    }
    
    .spinner-border {
        width: 1.5rem;
        height: 1.5rem;
        border-width: 0.2em;
    }
    
    /* Alert mobile optimization */
    .alert {
        font-size: 0.9rem;
        padding: 0.75rem 1rem;
        margin-bottom: 1rem;
        border-radius: 6px;
    }
    
    /* Card mobile optimization */
    .card {
        border-radius: 8px;
        margin-bottom: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .card-title {
        font-size: 1.1rem;
        margin-bottom: 0.75rem;
    }
    
    .card-text {
        font-size: 0.9rem;
        line-height: 1.4;
    }
    
    /* Badge mobile optimization */
    .badge {
        font-size: 0.7rem;
        padding: 0.35em 0.65em;
    }
    
    /* List group mobile optimization */
    .list-group-item {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        border-radius: 6px;
    }
    
    /* Modal mobile optimization */
    .modal-content {
        border-radius: 8px;
        margin: 1rem;
    }
    
    .modal-header {
        padding: 1rem;
        border-bottom: 1px solid var(--bs-border-color);
    }
    
    .modal-body {
        padding: 1rem;
        font-size: 0.9rem;
    }
    
    .modal-footer {
        padding: 1rem;
        border-top: 1px solid var(--bs-border-color);
    }
    
    /* Tooltip mobile optimization */
    .tooltip {
        font-size: 0.8rem;
    }
    
    /* Breadcrumb mobile optimization */
    .breadcrumb {
        font-size: 0.85rem;
        margin-bottom: 1rem;
        padding: 0.5rem 0;
    }
    
    .breadcrumb-item {
        padding-right: 0.5rem;
    }
    
    /* Pagination mobile optimization */
    .pagination {
        margin-bottom: 1rem;
    }
    
    .page-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
        min-width: 42px;
        min-height: 42px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Tab mobile optimization */
    .nav-tabs .nav-link {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
        border-radius: 6px 6px 0 0;
    }
    
    .tab-content {
        padding: 1rem;
        font-size: 0.9rem;
    }
    
    /* Icon mobile optimization */
    .bi, .fas, .far, .fab {
        font-size: 1rem;
        vertical-align: -0.125em;
    }
    
    .text-muted {
        color: #6c757d !important;
        font-size: 0.85rem;
    }
    
    /* Spacing mobile optimization */
    .mb-5 {
        margin-bottom: 2rem !important;
    }
    
    .mt-5 {
        margin-top: 2rem !important;
    }
    
    .py-4 {
        padding-top: 1.5rem !important;
        padding-bottom: 1.5rem !important;
    }
    
    .px-3 {
        padding-left: 1rem !important;
        padding-right: 1rem !important;
    }
    
    /* Text mobile optimization */
    h1 {
        font-size: 1.8rem;
        line-height: 1.2;
        margin-bottom: 1rem;
    }
    
    h2 {
        font-size: 1.5rem;
        line-height: 1.3;
        margin-bottom: 0.75rem;
    }
    
    h3 {
        font-size: 1.3rem;
        line-height: 1.3;
        margin-bottom: 0.75rem;
    }
    
    h4 {
        font-size: 1.1rem;
        line-height: 1.3;
        margin-bottom: 0.5rem;
    }
    
    h5 {
        font-size: 1rem;
        line-height: 1.3;
        margin-bottom: 0.5rem;
    }
    
    h6 {
        font-size: 0.9rem;
        line-height: 1.3;
        margin-bottom: 0.5rem;
    }
    
    p {
        margin-bottom: 1rem;
        line-height: 1.4;
    }
    
    /* Performance optimization for mobile */
    * {
        box-sizing: border-box;
        -webkit-tap-highlight-color: transparent;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    
    /* Reduce motion for better performance */
    @media (prefers-reduced-motion: reduce) {
        * {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
        }
    }
    
    /* Touch optimization */
    button,
    .btn,
    a,
    .dropdown-item,
    .nav-link {
        touch-action: manipulation;
        min-height: 44px;
        min-width: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Accessibility improvements for mobile */
    .sr-only {
        position: absolute !important;
        width: 1px !important;
        height: 1px !important;
        padding: 0 !important;
        margin: -1px !important;
        overflow: hidden !important;
        clip: rect(0, 0, 0, 0) !important;
        white-space: nowrap !important;
        border: 0 !important;
    }
    
    /* Focus indicators for mobile */
    button:focus,
    .btn:focus,
    a:focus,
    .dropdown-item:focus,
    .nav-link:focus,
    .form-control:focus {
        outline: 2px solid var(--bs-primary, #0d6efd);
        outline-offset: 2px;
        box-shadow: none;
    }
}