/* Mobile Performance Optimizations */
/* GPU Acceleration y transiciones fluidas */

/* Enable GPU acceleration for frequently animated elements */
.verse-card,
.explore-card,
.mood-btn,
.character-card,
.book-item,
.search-card,
.favorite-row,
.modal-content {
    will-change: transform, opacity;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Smooth transitions optimized for mobile */
.verse-card,
.explore-card,
.mood-btn,
.character-card,
.book-item,
.search-card,
.favorite-row,
.action-btn,
.primary-btn,
.ghost-btn,
.share-option,
.history-item {
    transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.15s cubic-bezier(0.4, 0, 0.2, 1),
                color 0.15s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.15s cubic-bezier(0.4, 0, 0.2, 1),
                background 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Remove will-change after animations to save memory */
.verse-card:not(:hover),
.explore-card:not(:hover),
.mood-btn:not(:hover),
.character-card:not(:hover),
.book-item:not(:hover),
.search-card:not(:hover) {
    will-change: auto;
}

/* Reduce backdrop-filter on mobile - use simpler solution */
@supports (backdrop-filter: blur(10px)) {
    @media (max-width: 768px) {
        .verse-card,
        .mood-container,
        .exploration-detail,
        .search-section,
        .modal-content,
        .footer {
            backdrop-filter: blur(4px);
        }
    }
}

/* Button touch feedback */
button,
a,
[role="button"] {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* Contain layout for better performance */
.verse-card,
.exploration-grid,
.books-list,
.characters-grid,
.search-results,
.favorites-list,
.mood-grid {
    contain: layout style;
}

/* Reduce animations in reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Optimize scrolling performance */
.modal-content,
.exploration-detail,
.search-results {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

/* Performance-optimized animations */
@keyframes slideUpMobile {
    from {
        transform: translateY(8px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes fadeInFast {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Reduce image rendering overhead */
img {
    backface-visibility: hidden;
}

/* Network efficient loading states */
.skeleton {
    animation: shimmerMove 1.3s infinite;
    will-change: background-position;
}

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

/* Touch-friendly sizing */
@media (max-width: 768px) {
    button,
    a,
    input,
    select,
    textarea {
        min-height: 44px;
        min-width: 44px;
    }

    .action-btn,
    .primary-btn,
    .ghost-btn,
    .mood-btn,
    .share-option {
        min-height: 48px;
        padding: 0.75rem;
    }

    /* Increase tap target size */
    .verse-actions {
        gap: 0.5rem;
    }

    .verse-actions button {
        padding: 1rem;
        min-height: 48px;
    }
}

/* Optimize form performance */
input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--highlight);
    box-shadow: 0 0 0 2px rgba(79, 209, 197, 0.1);
}

/* Smooth scrolling without jank */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

/* Prevent layout shift during load */
html {
    scroll-padding-top: 60px;
}

/* Optimize modal animations */
.modal.hidden,
.modal-overlay {
    pointer-events: none;
}

/* Faster button feedback */
button:active {
    transform: scale3d(0.95, 0.95, 1);
}

/* Optimize dropdown performance */
select,
.filter-select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

/* Efficient hover states on touch devices */
@media (hover: none) {
    .verse-card:hover,
    .explore-card:hover,
    .mood-btn:hover,
    .character-card:hover,
    .book-item:hover,
    .search-card:hover {
        transform: none;
        box-shadow: none;
        border-color: var(--border);
    }

    .verse-card:active,
    .explore-card:active,
    .mood-btn:active,
    .character-card:active,
    .book-item:active,
    .search-card:active {
        transform: scale3d(0.98, 0.98, 1);
        opacity: 0.9;
    }
}

/* Optimize large list rendering */
.books-list,
.favorites-list,
.search-results {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Prevent cumulative layout shift */
.navbar,
.verse-card,
.modal-content {
    contain: content;
}

/* Memory-efficient animations */
@media (max-width: 480px) {
    .explore-card::before,
    .verse-card::before,
    .verse-card::after {
        content: none;
    }
}

/* Optimize scrollbar behavior */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--highlight);
}

/* Fast focus states */
:focus-visible {
    outline: 2px solid var(--highlight);
    outline-offset: 2px;
}

/* Optimize hero animations */
.hero {
    animation: fadeInFast 0.3s ease-out;
}

/* Reduce paint operations */
@media (max-width: 768px) {
    .mood-grid,
    .exploration-grid,
    .books-container,
    .characters-grid {
        gap: 0.75rem;
    }
}