/**
 * Estilos Frontend - Google Photos Grid+
 * Mobile-first, otimizado para performance
 * @author Maicon Souza – Jmtechnology
 * @version 3.4.0
 */

/* Container */
.gpg-container {
    --gpg-columns: 2;
    --gpg-gap: 8px;
    --gpg-radius: 8px;
    --gpg-transition: 0.3s ease;
    --gpg-primary: #2563eb;
    --gpg-primary-hover: #1d4ed8;
    --gpg-text: #1f2937;
    --gpg-text-muted: #6b7280;
    --gpg-bg: #f9fafb;
    --gpg-border: #e5e7eb;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--gpg-text);
}

.gpg-title {
    margin: 0 0 20px;
    font-size: 1.5rem;
    font-weight: 600;
}

/* Filtros */
.gpg-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--gpg-bg);
    border-radius: var(--gpg-radius);
}

.gpg-album-select {
    flex: 1;
    min-width: 150px;
    padding: 10px 12px;
    border: 1px solid var(--gpg-border);
    border-radius: var(--gpg-radius);
    font-size: 14px;
    background: #fff;
    cursor: pointer;
}

.gpg-album-select:focus {
    outline: none;
    border-color: var(--gpg-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.gpg-date-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.gpg-preset-btn {
    padding: 8px 16px;
    border: 1px solid var(--gpg-border);
    border-radius: 20px;
    background: #fff;
    font-size: 13px;
    cursor: pointer;
    transition: all var(--gpg-transition);
}

.gpg-preset-btn:hover,
.gpg-preset-btn.active {
    background: var(--gpg-primary);
    border-color: var(--gpg-primary);
    color: #fff;
}

/* Grid */
.gpg-grid {
    display: grid;
    grid-template-columns: repeat(var(--gpg-columns), 1fr);
    gap: var(--gpg-gap);
}

/* Item */
.gpg-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--gpg-radius);
    background: var(--gpg-bg);
    aspect-ratio: 1;
    cursor: pointer;
    will-change: transform, opacity;
    backface-visibility: hidden;
}

.gpg-item.gpg-ratio-4-3 {
    aspect-ratio: 4/3;
}

.gpg-item.gpg-ratio-16-9 {
    aspect-ratio: 16/9;
}

.gpg-item.gpg-ratio-original {
    aspect-ratio: auto;
}

.gpg-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    transition: transform var(--gpg-transition), opacity 0.4s ease;
}

.gpg-item:hover img {
    transform: scale(1.05);
}

.gpg-item:focus {
    outline: 2px solid var(--gpg-primary);
    outline-offset: 2px;
}

/* Animações de Carregamento */
.gpg-item.gpg-item-loading {
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 50%, #f3f4f6 100%);
    background-size: 200% 200%;
    animation: gpg-gradient-shift 1.5s ease infinite;
}

.gpg-item.gpg-item-loading img {
    opacity: 0;
}

.gpg-item.gpg-item-loaded {
    animation: gpg-fade-in 0.5s ease forwards;
}

.gpg-item.gpg-item-loaded img {
    opacity: 1;
}

@keyframes gpg-gradient-shift {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

@keyframes gpg-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Skeleton */
.gpg-skeleton-grid {
    display: grid;
    grid-template-columns: repeat(var(--gpg-columns), 1fr);
    gap: var(--gpg-gap);
}

.gpg-skeleton-item {
    aspect-ratio: 1;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: gpg-shimmer 1.5s infinite;
    border-radius: var(--gpg-radius);
}

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

    100% {
        background-position: -200% 0;
    }
}

/* Load More */
.gpg-load-more {
    margin-top: 30px;
    text-align: center;
    display: none;
}

/* Loading */
.gpg-loading {
    padding: 40px;
    text-align: center;
}

.gpg-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--gpg-border);
    border-top-color: var(--gpg-primary);
    border-radius: 50%;
    animation: gpg-spin 0.8s linear infinite;
}

@keyframes gpg-spin {
    to {
        transform: rotate(360deg);
    }
}

.gpg-scroll-sentinel {
    height: 1px;
    width: 100%;
}

/* Error */
.gpg-error-message {
    padding: 20px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--gpg-radius);
    color: #b91c1c;
    text-align: center;
}

/* Lightbox */
.gpg-lightbox {
    position: fixed;
    inset: 0;
    z-index: 99999;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.95);
    opacity: 0;
    transition: opacity var(--gpg-transition);
}

.gpg-lightbox.active {
    display: flex;
    opacity: 1;
}

.gpg-lightbox-content {
    max-width: 90vw;
    max-height: 90vh;
}

.gpg-lightbox-image {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
}

.gpg-lightbox-close,
.gpg-lightbox-prev,
.gpg-lightbox-next {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #fff;
    font-size: 32px;
    cursor: pointer;
    padding: 10px 20px;
    transition: background var(--gpg-transition);
}

.gpg-lightbox-close:hover,
.gpg-lightbox-prev:hover,
.gpg-lightbox-next:hover {
    background: rgba(255, 255, 255, 0.2);
}

.gpg-lightbox-close {
    top: 20px;
    right: 20px;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    padding: 0;
}

.gpg-lightbox-prev {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    border-radius: var(--gpg-radius);
}

.gpg-lightbox-next {
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    border-radius: var(--gpg-radius);
}

/* Footer do Lightbox */
.gpg-lightbox-footer {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 20px;
}

.gpg-lightbox-counter {
    color: #fff;
    font-size: 14px;
}

.gpg-lightbox-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    color: #fff !important;
    text-decoration: none !important;
    font-size: 14px;
    transition: all 0.2s;
    backdrop-filter: blur(10px);
}

.gpg-lightbox-download:hover,
.gpg-lightbox-download:focus,
.gpg-lightbox-download:visited {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    color: #fff !important;
    text-decoration: none !important;
}

.gpg-lightbox-download svg {
    flex-shrink: 0;
    stroke: #fff;
}

/* Botões de Visualização (Toggle Colunas) */
.gpg-view-toggle {
    display: flex;
    gap: 4px;
    margin-left: auto;
}

.gpg-view-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--gpg-border);
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    padding: 0;
}

.gpg-view-btn:hover {
    border-color: var(--gpg-primary);
    background: rgba(37, 99, 235, 0.05);
}

.gpg-view-btn.active {
    background: var(--gpg-primary);
    border-color: var(--gpg-primary);
    color: #fff;
}

.gpg-view-btn svg {
    width: 18px;
    height: 18px;
}

/* Responsive - Mobile Pequeno (1 coluna opcional) */
@media (max-width: 480px) {
    .gpg-container {
        --gpg-columns: 1;
        --gpg-gap: 10px;
    }

    .gpg-container.gpg-cols-2 {
        --gpg-columns: 2;
    }

    .gpg-item {
        aspect-ratio: 4/3;
    }

    .gpg-container.gpg-cols-2 .gpg-item {
        aspect-ratio: 1;
    }
}

/* Responsive - Mobile */
@media (max-width: 767px) {
    .gpg-container {
        --gpg-columns: 2;
        --gpg-gap: 8px;
    }

    .gpg-container.gpg-cols-1 {
        --gpg-columns: 1;
    }

    .gpg-container.gpg-cols-1 .gpg-item {
        aspect-ratio: 4/3;
    }
}

/* Responsive - Tablet */
@media (min-width: 768px) {
    .gpg-container {
        --gpg-columns: 3;
        --gpg-gap: 12px;
    }

    .gpg-title {
        font-size: 1.75rem;
    }

    .gpg-filters {
        flex-wrap: nowrap;
    }
}

/* Responsive - Desktop */
@media (min-width: 1024px) {
    .gpg-container {
        --gpg-columns: 4;
        --gpg-gap: 16px;
    }

    .gpg-title {
        font-size: 2rem;
    }
}

/* Acessibilidade */
@media (prefers-reduced-motion: reduce) {

    .gpg-item img,
    .gpg-lightbox,
    .gpg-spinner,
    .gpg-skeleton-item,
    .gpg-item.gpg-item-loading,
    .gpg-item.gpg-item-loaded {
        animation: none;
        transition: none;
    }
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    .gpg-container {
        --gpg-text: #f3f4f6;
        --gpg-text-muted: #9ca3af;
        --gpg-bg: #1f2937;
        --gpg-border: #374151;
    }

    .gpg-album-select {
        background: #374151;
        color: #f3f4f6;
    }

    .gpg-preset-btn {
        background: #374151;
        color: #f3f4f6;
    }

    .gpg-view-btn {
        background: #374151;
        color: #f3f4f6;
        border-color: #4b5563;
    }
}