/* ==========================================================================
   DESIGN SYSTEM & CUSTOM PROPERTIES (CSS VARIABLES)
   ========================================================================== */
:root {
    /* Color Palette */
    --bg-main: hsl(224, 25%, 8%);
    --bg-surface: hsla(224, 25%, 12%, 0.6);
    --bg-surface-hover: hsla(224, 25%, 16%, 0.8);
    --border-glass: hsla(224, 20%, 22%, 0.4);
    --border-glass-active: hsla(262, 80%, 60%, 0.6);
    
    --primary: hsl(262, 80%, 60%);
    --primary-hover: hsl(262, 85%, 66%);
    --primary-glow: rgba(139, 92, 246, 0.35);
    
    --secondary: hsl(190, 90%, 50%);
    --secondary-hover: hsl(190, 95%, 60%);
    
    --accent-fav: hsl(342, 92%, 60%);
    --accent-fav-glow: rgba(244, 63, 94, 0.4);
    
    --txt-primary: hsl(210, 40%, 98%);
    --txt-muted: hsl(215, 16%, 70%);
    --txt-dark: hsl(224, 25%, 4%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 8px 30px -10px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 20px 50px -15px rgba(0, 0, 0, 0.8);
    --shadow-glow: 0 0 25px 0 var(--primary-glow);
    
    /* Layout & Utilities */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    
    --max-width: 1400px;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--txt-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
    position: relative;
}

/* Background Glow Effects */
.bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(140px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.35;
    animation: pulseGlow 12s infinite alternate ease-in-out;
}

.bg-glow-1 {
    top: -150px;
    left: -150px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
}

.bg-glow-2 {
    bottom: -150px;
    right: -150px;
    background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
    animation-delay: -6s;
}

@keyframes pulseGlow {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 0.25;
    }
    100% {
        transform: translate(80px, 40px) scale(1.15);
        opacity: 0.4;
    }
}

/* ==========================================================================
   CONTAINER & LAYOUT
   ========================================================================== */
.app-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* ==========================================================================
   APP HEADER
   ========================================================================== */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-glass);
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-icon {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.18);
    border: none;
}

.brand-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.2);
}

.brand h1 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #ffffff 40%, var(--txt-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand .subtitle {
    font-size: 0.85rem;
    color: var(--txt-muted);
    font-weight: 500;
}

/* Stats Panel */
.stats-panel {
    display: flex;
    gap: 1rem;
}

.stat-item {
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 90px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.stat-item:hover {
    transform: translateY(-2px);
    border-color: var(--border-glass-active);
    box-shadow: var(--shadow-md);
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--txt-primary);
}

#stat-favorites .stat-value {
    color: var(--accent-fav);
}

.stat-label {
    font-size: 0.7rem;
    color: var(--txt-muted);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   CONTROLS BAR (SEARCH / FILTERS)
   ========================================================================== */
.controls-section {
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 1rem;
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    box-shadow: var(--shadow-md);
}

/* Search Box */
.search-box {
    position: relative;
    flex: 1;
    min-width: 280px;
    max-width: 480px;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--txt-muted);
    pointer-events: none;
    transition: color var(--transition-fast);
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.8rem;
    background: hsla(224, 25%, 6%, 0.6);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--txt-primary);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.search-box input:focus + .search-icon {
    color: var(--primary);
}

.clear-search-btn {
    position: absolute;
    right: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--txt-muted);
    cursor: pointer;
    padding: 2px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.clear-search-btn:hover {
    color: var(--txt-primary);
    background-color: rgba(255, 255, 255, 0.1);
}

.clear-search-btn svg {
    width: 16px;
    height: 16px;
}

/* Filter Actions Group */
.filter-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Button style rules */
button, .filter-btn, .layout-btn, .action-btn {
    font-family: inherit;
    cursor: pointer;
}

.filter-btn {
    background: hsla(224, 25%, 6%, 0.6);
    border: 1px solid var(--border-glass);
    color: var(--txt-muted);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.filter-btn svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast), fill var(--transition-fast);
}

.filter-btn:hover {
    color: var(--txt-primary);
    border-color: var(--border-glass-active);
}

.filter-btn.active {
    color: var(--txt-primary);
    background: hsla(342, 92%, 60%, 0.15);
    border-color: var(--accent-fav);
    box-shadow: 0 0 15px var(--accent-fav-glow);
}

.filter-btn.active svg {
    fill: var(--accent-fav);
    color: var(--accent-fav);
    transform: scale(1.1);
}

/* Sorting Selector */
.sort-select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: hsla(224, 25%, 6%, 0.6);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 0 0.75rem;
    height: 43px; /* Align height with buttons */
    transition: border-color var(--transition-fast);
}

.sort-select-wrapper:hover {
    border-color: var(--border-glass-active);
}

.sort-icon {
    width: 16px;
    height: 16px;
    color: var(--txt-muted);
    margin-right: 0.5rem;
}

.sort-select {
    background: transparent;
    border: none;
    color: var(--txt-primary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    outline: none;
    cursor: pointer;
    padding-right: 1.5rem;
    -webkit-appearance: none;
    appearance: none;
}

/* Custom dropdown arrow */
.sort-select-wrapper::after {
    content: "";
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid var(--txt-muted);
    pointer-events: none;
}

/* Layout Grid/List Switcher */
.layout-toggle {
    display: flex;
    background: hsla(224, 25%, 6%, 0.6);
    border: 1px solid var(--border-glass);
    padding: 3px;
    border-radius: var(--radius-sm);
}

.layout-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: 5px;
    color: var(--txt-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.layout-btn svg {
    width: 16px;
    height: 16px;
}

.layout-btn:hover {
    color: var(--txt-primary);
}

.layout-btn.active {
    background: var(--primary);
    color: var(--txt-primary);
    box-shadow: 0 4px 10px rgba(139, 92, 246, 0.4);
}

/* ==========================================================================
   GALLERY CONTAINER & CARDS
   ========================================================================== */
.gallery-container {
    flex: 1;
    position: relative;
    min-height: 400px;
}

/* Dynamic Grid styles */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    transition: opacity var(--transition-smooth);
}

/* List layout style version */
.gallery-grid.list-layout {
    grid-template-columns: 1fr;
    max-width: 1000px;
    margin: 0 auto;
    gap: 1rem;
}

/* Image Cards (Premium Glass Card) */
.photo-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    overflow: hidden;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
    animation: cardEntrance 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes cardEntrance {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.photo-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-glass-active);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* Image wrapper */
.photo-wrapper {
    position: relative;
    width: 100%;
    padding-top: 75%; /* 4:3 Aspect Ratio */
    overflow: hidden;
    background: #0b0d19;
    cursor: zoom-in;
}

.photo-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-smooth), filter 0.5s var(--transition-smooth);
    filter: brightness(0.95);
}

.photo-card:hover .photo-wrapper img {
    transform: scale(1.06);
    filter: brightness(1.05);
}

/* Gradient Overlay on Hover */
.photo-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(10, 11, 20, 0.9) 0%, rgba(10, 11, 20, 0.2) 60%, transparent 100%);
    opacity: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 1.25rem;
    transition: opacity var(--transition-smooth);
}

.photo-card:hover .photo-overlay {
    opacity: 1;
}

/* Zoom Hover icon in Card Center */
.photo-zoom-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.7);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    opacity: 0;
    transition: transform var(--transition-smooth), opacity var(--transition-smooth);
    pointer-events: none;
}

.photo-card:hover .photo-zoom-icon {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.photo-zoom-icon svg {
    width: 20px;
    height: 20px;
}

/* Card details (visible inside overlay) */
.overlay-details {
    color: var(--txt-primary);
    transform: translateY(15px);
    transition: transform var(--transition-smooth);
}

.photo-card:hover .overlay-details {
    transform: translateY(0);
}

.overlay-details .photo-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.overlay-details .photo-meta {
    font-size: 0.75rem;
    color: var(--txt-muted);
    display: flex;
    gap: 0.75rem;
}

/* Fast Action Buttons in overlay */
.overlay-actions {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--transition-smooth), transform var(--transition-smooth);
    z-index: 5;
}

.photo-card:hover .overlay-actions {
    opacity: 1;
    transform: translateY(0);
}

.overlay-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(10, 11, 20, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    color: var(--txt-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.overlay-btn:hover {
    transform: scale(1.1);
    background: var(--bg-main);
    border-color: var(--txt-primary);
}

.overlay-btn.fav-btn.active {
    color: var(--accent-fav);
    border-color: var(--accent-fav);
    background: rgba(244, 63, 94, 0.15);
    box-shadow: 0 0 10px var(--accent-fav-glow);
}

.overlay-btn.fav-btn svg {
    width: 16px;
    height: 16px;
    transition: fill var(--transition-fast);
}

.overlay-btn.fav-btn.active svg {
    fill: var(--accent-fav);
}

/* Non-hover Card Info Body (Backup info for devices without hover) */
.card-body {
    padding: 1rem;
    border-top: 1px solid var(--border-glass);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.card-body .photo-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--txt-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-body .photo-date {
    font-size: 0.75rem;
    color: var(--txt-muted);
}

.card-body .photo-info-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
}

.card-body .photo-size {
    font-size: 0.75rem;
    color: var(--primary-hover);
    font-weight: 600;
}

/* Responsive List View styles */
.gallery-grid.list-layout .photo-card {
    flex-direction: row;
    align-items: center;
    padding: 0.75rem;
    gap: 1.25rem;
    height: 100px;
}

.gallery-grid.list-layout .photo-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.gallery-grid.list-layout .photo-wrapper {
    width: 110px;
    height: 80px;
    padding-top: 0;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.gallery-grid.list-layout .card-body {
    border-top: none;
    padding: 0;
    flex: 1;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    align-items: center;
    gap: 1rem;
}

.gallery-grid.list-layout .card-body .photo-title {
    font-size: 1rem;
}

.gallery-grid.list-layout .card-body .photo-info-bottom {
    margin-top: 0;
    display: contents;
}

.gallery-grid.list-layout .photo-overlay,
.gallery-grid.list-layout .photo-zoom-icon {
    display: none; /* Hide grid-specific hover effects in list view */
}

/* ==========================================================================
   EMPTY STATE
   ========================================================================== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-surface);
    border: 1px dashed var(--border-glass);
    border-radius: var(--radius-md);
    backdrop-filter: blur(12px);
    max-width: 500px;
    margin: 4rem auto;
    animation: cardEntrance 0.4s ease-out;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    color: var(--txt-muted);
    margin-bottom: 1.5rem;
}

.empty-state h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--txt-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.reset-btn {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    color: var(--txt-primary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
}

.reset-btn:active {
    transform: translateY(0);
}

/* ==========================================================================
   LIGHTBOX OVERLAY (MODAL VISUALIZER)
   ========================================================================== */
.lightbox-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(6, 7, 13, 0.95);
    z-index: 1000;
    display: none;
    flex-direction: column;
    justify-content: space-between;
    opacity: 0;
    transition: opacity 0.35s ease;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
}

/* Trigger click outside images */
.lightbox-bg-close {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

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

/* Lightbox Toolbar (Top) */
.lightbox-toolbar {
    position: relative;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: linear-gradient(to bottom, rgba(6, 7, 13, 0.8) 0%, transparent 100%);
}

.info-filename {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--txt-primary);
    letter-spacing: -0.01em;
}

.lightbox-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--txt-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    color: var(--txt-primary);
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

.action-btn:active {
    transform: scale(0.95);
}

.action-btn.fav-toggle-btn.active {
    color: var(--accent-fav);
    border-color: var(--accent-fav);
    background: rgba(244, 63, 94, 0.15);
    box-shadow: 0 0 15px var(--accent-fav-glow);
}

.action-btn.fav-toggle-btn.active svg {
    fill: var(--accent-fav);
}

.action-btn.close-btn:hover {
    background: hsl(0, 85%, 60%);
    border-color: hsl(0, 85%, 60%);
    color: #fff;
}

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

/* Lightbox navigation buttons */
.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--txt-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    color: var(--txt-primary);
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-50%) scale(1.08);
}

.nav-btn:active {
    transform: translateY(-50%) scale(0.92);
}

.nav-btn svg {
    width: 24px;
    height: 24px;
}

.prev-btn {
    left: 1.5rem;
}

.next-btn {
    right: 1.5rem;
}

/* Main Lightbox Content */
.lightbox-content-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    z-index: 2;
    padding: 1rem 6rem;
}

.zoom-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    transform-origin: center center;
    cursor: grab;
}

.zoom-container:active {
    cursor: grabbing;
}

.zoom-container img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    user-select: none;
    -webkit-user-drag: none;
    border-radius: 4px;
    box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.9);
    transition: opacity 0.25s ease, transform 0.2s ease;
    opacity: 0;
}

.zoom-container img.loaded {
    opacity: 1;
}

/* Lightbox Caption Bar (Bottom) */
.lightbox-caption {
    position: relative;
    z-index: 10;
    padding: 1.5rem;
    text-align: center;
    background: linear-gradient(to top, rgba(6, 7, 13, 0.8) 0%, transparent 100%);
    display: flex;
    justify-content: center;
}

.caption-details {
    background: rgba(10, 11, 20, 0.65);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0.5rem 1.5rem;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--txt-muted);
}

.caption-counter {
    color: var(--txt-primary);
    font-weight: 700;
}

.caption-separator {
    color: var(--border-glass);
}

.caption-size {
    color: var(--secondary);
    font-weight: 600;
}

/* Autoplay active state on Slideshow Button */
#lightbox-slideshow.playing {
    color: var(--txt-primary);
    background: rgba(16, 185, 129, 0.15);
    border-color: hsl(150, 84%, 50%);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.3);
}

/* ==========================================================================
   APP FOOTER
   ========================================================================== */
.app-footer {
    text-align: center;
    padding-top: 2rem;
    padding-bottom: 2.5rem;
    border-top: 1px solid var(--border-glass);
    color: var(--txt-muted);
    font-size: 0.85rem;
    margin-top: 6rem; /* Generous breathing room between grid and footer */
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 900px) {
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .stats-panel {
        width: 100%;
        justify-content: space-between;
    }
    
    .controls-section {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-box {
        max-width: 100%;
    }
    
    .filter-actions {
        justify-content: space-between;
        width: 100%;
    }
    
    .sort-select-wrapper {
        flex-grow: 1;
    }

    .lightbox-content-wrapper {
        padding: 1rem 4rem;
    }
}

@media (max-width: 600px) {
    .app-container {
        padding: 1rem 0.5rem;
        gap: 1rem;
    }

    .app-header {
        padding-bottom: 0.75rem;
    }

    .brand {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .brand h1 {
        font-size: 1.4rem;
        white-space: normal;
    }

    .brand-icon {
        width: 90px;
        height: 90px;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stat-item {
        padding: 0.5rem 0.75rem;
        min-width: 75px;
    }

    .stat-value {
        font-size: 1.1rem;
    }

    .filter-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .layout-toggle {
        display: none; /* Hide layout toggle on small screens (always force grid) */
    }

    .nav-btn {
        width: 44px;
        height: 44px;
    }

    .prev-btn {
        left: 0.5rem;
    }

    .next-btn {
        right: 0.5rem;
    }

    .lightbox-content-wrapper {
        padding: 1rem 1rem;
    }
    
    .lightbox-toolbar {
        padding: 0.75rem 1rem;
    }
    
    .info-filename {
        max-width: 120px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    .caption-details {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
        gap: 0.5rem;
    }
    
    .caption-separator {
        display: none;
    }
    
    .caption-details {
        flex-direction: column;
    }
}