/* ============================================================================
   Immich Read-Only Display - Styles
   A modern, responsive photo gallery interface
   ============================================================================ */

/* CSS Custom Properties */
:root {
    /* Colors - Light Theme */
    --color-bg: #f8f9fa;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #e9ecef;
    --color-text: #212529;
    --color-text-secondary: #6c757d;
    --color-text-muted: #adb5bd;
    --color-border: #dee2e6;
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-light: #eef2ff;
    --color-accent: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-overlay: rgba(0, 0, 0, 0.8);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    /* Layout */
    --header-height: 64px;
    --sidebar-width: 320px;
    --gallery-gap: 4px;
    --thumbnail-size: 200px;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-index layers */
    --z-header: 100;
    --z-sidebar: 200;
    --z-lightbox: 1000;
    --z-lightbox-content: 1001;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-border: #334155;
    --color-primary: #818cf8;
    --color-primary-hover: #a5b4fc;
    --color-primary-light: #1e1b4b;
}

/* ============================================================================
   Reset & Base Styles
   ============================================================================ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    overflow-x: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select {
    font-family: inherit;
    font-size: inherit;
}

/* ============================================================================
   Utility Classes
   ============================================================================ */

.icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

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

.spinner-small {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

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

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

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

.btn-secondary {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
}

.btn-secondary:hover {
    background-color: var(--color-border);
}

.btn-text {
    color: var(--color-primary);
    padding: var(--space-xs) var(--space-sm);
}

.btn-text:hover {
    background-color: var(--color-primary-light);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    color: var(--color-text-secondary);
}

.btn-icon:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
}

.btn-full {
    width: 100%;
}

/* ============================================================================
   Form Elements
   ============================================================================ */

.input, .select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.input:focus, .select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input::placeholder {
    color: var(--color-text-muted);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.input-group label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.radio-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.radio-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    cursor: pointer;
}

.radio-item input[type="radio"] {
    accent-color: var(--color-primary);
}

.radio-label {
    font-size: var(--font-size-sm);
}

/* ============================================================================
   Header
   ============================================================================ */

.header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    height: 100%;
    padding: 0 var(--space-lg);
    max-width: 2000px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

.logo-icon {
    font-size: 1.5rem;
}

.search-container {
    flex: 1;
    max-width: 600px;
    display: flex;
    position: relative;
}

.search-input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    padding-right: 48px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-md);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.search-btn {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.search-btn:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.filter-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    background-color: var(--color-primary);
    color: white;
    font-size: 11px;
    font-weight: 600;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#filter-toggle {
    position: relative;
}

/* Theme toggle */
[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="light"] .icon-moon,
:root:not([data-theme]) .icon-moon {
    display: none;
}

/* ============================================================================
   Filter Panel
   ============================================================================ */

.filter-panel {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background-color: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border);
    z-index: var(--z-sidebar);
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
}

.filter-panel:not([hidden]) {
    transform: translateX(0);
}

.filter-panel-content {
    padding: var(--space-lg);
}

.filter-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.filter-header h2 {
    font-size: var(--font-size-xl);
}

.filter-section {
    margin-bottom: var(--space-xl);
}

.filter-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-md);
}

.filter-title .icon {
    width: 16px;
    height: 16px;
}

.date-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
}

/* People Chips */
.people-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    max-height: 200px;
    overflow-y: auto;
}

.person-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.person-chip:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
}

.person-chip.selected {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.person-chip img {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    object-fit: cover;
}

/* ============================================================================
   Main Content
   ============================================================================ */

.main-content {
    flex: 1;
    padding: var(--space-md);
    padding-top: 0;
}

/* Status Bar */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    flex-wrap: wrap;
}

.status-info {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.active-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.filter-banner {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid var(--color-primary);
}

.banner-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    padding: 0;
    border: none;
    background: none;
    color: inherit;
    opacity: 0.7;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.banner-close:hover {
    opacity: 1;
}

.banner-close .icon {
    width: 16px;
    height: 16px;
}

.filter-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.filter-tag button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    color: inherit;
    opacity: 0.7;
}

.filter-tag button:hover {
    opacity: 1;
}

/* ============================================================================
   Gallery Grid
   ============================================================================ */

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--thumbnail-size), 1fr));
    gap: var(--gallery-gap);
}

.gallery-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    color: var(--color-text-secondary);
}

.gallery-item {
    position: relative;
    aspect-ratio: 1;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.gallery-item:hover {
    transform: scale(1.02);
}

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

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity var(--transition-normal);
}

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

.gallery-item-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-sm);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.6));
    color: white;
    font-size: var(--font-size-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.gallery-item:hover .gallery-item-overlay {
    opacity: 1;
}

.video-indicator {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    width: 28px;
    height: 28px;
    background-color: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.video-indicator svg {
    width: 14px;
    height: 14px;
}

/* ============================================================================
   Load More & States
   ============================================================================ */

.load-more-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl);
}

.loading-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-secondary);
}

.empty-state, .error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-icon, .error-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.empty-state h3, .error-state h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.error-state {
    color: var(--color-error);
}

/* ============================================================================
   Lightbox
   ============================================================================ */

.lightbox {
    position: fixed;
    inset: 0;
    z-index: var(--z-lightbox);
    display: flex;
}

.lightbox-overlay {
    position: absolute;
    inset: 0;
    background-color: var(--color-overlay);
}

.lightbox-content {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-lightbox-content);
}

.lightbox-media {
    position: relative;
    max-width: 90%;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    user-select: none;
}

.lightbox-video {
    max-width: 100%;
    max-height: 90vh;
    background-color: black;
}

.lightbox-loading {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.lightbox-loading .spinner {
    border-color: rgba(255, 255, 255, 0.2);
    border-top-color: white;
}

/* Lightbox Navigation */
.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border-radius: 50%;
    z-index: var(--z-lightbox-content);
    transition: all var(--transition-fast);
}

.lightbox-nav:hover {
    background-color: rgba(0, 0, 0, 0.8);
}

.lightbox-prev {
    left: var(--space-lg);
}

.lightbox-next {
    right: var(--space-lg);
}

.lightbox-close {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border-radius: 50%;
    z-index: var(--z-lightbox-content);
    transition: all var(--transition-fast);
}

.lightbox-close:hover {
    background-color: rgba(0, 0, 0, 0.8);
}

.lightbox-download {
    position: absolute;
    top: var(--space-lg);
    right: calc(var(--space-lg) + 60px);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    border-radius: 8px;
    z-index: var(--z-lightbox-content);
    transition: all var(--transition-fast);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
}

.lightbox-download:hover {
    background-color: rgba(0, 0, 0, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.lightbox-download .icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.download-label {
    display: inline;
}

.lightbox-info-toggle {
    position: absolute;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border-radius: 50%;
    z-index: var(--z-lightbox-content);
    transition: all var(--transition-fast);
}

.lightbox-info-toggle:hover {
    background-color: rgba(0, 0, 0, 0.8);
}

/* Lightbox Sidebar */
.lightbox-sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-bg-secondary);
    height: 100%;
    overflow-y: auto;
    z-index: var(--z-lightbox-content);
    flex-shrink: 0;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.sidebar-header h2 {
    font-size: var(--font-size-lg);
}

.sidebar-content {
    padding: var(--space-lg);
}

.metadata-section {
    margin-bottom: var(--space-xl);
}

.metadata-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.metadata-title .icon {
    width: 16px;
    height: 16px;
}

.metadata-value {
    font-size: var(--font-size-md);
    color: var(--color-text);
    word-break: break-word;
}

.metadata-secondary {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

.exif-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.exif-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.exif-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.exif-value {
    font-size: var(--font-size-md);
    font-weight: 500;
}

.people-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.people-tags .person-chip {
    cursor: pointer;
}

/* ============================================================================
   Responsive Design
   ============================================================================ */

@media (max-width: 1024px) {
    .filter-panel {
        width: 100%;
        max-width: 400px;
    }
    
    .lightbox-sidebar {
        position: absolute;
        right: 0;
        transform: translateX(100%);
        transition: transform var(--transition-normal);
    }
    
    .lightbox-sidebar:not([hidden]) {
        transform: translateX(0);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
        --thumbnail-size: 150px;
    }
    
    .header-content {
        padding: 0 var(--space-md);
    }
    
    .logo-text {
        display: none;
    }
    
    .search-container {
        max-width: none;
    }
    
    .gallery {
        gap: 2px;
    }
    
    .lightbox-nav {
        width: 40px;
        height: 40px;
    }
    
    .lightbox-prev {
        left: var(--space-sm);
    }
    
    .lightbox-next {
        right: var(--space-sm);
    }
}

@media (max-width: 480px) {
    :root {
        --thumbnail-size: 100px;
    }
    
    .filter-panel {
        max-width: 100%;
    }
    
    .date-inputs {
        grid-template-columns: 1fr;
    }
}

/* ============================================================================
   Accessibility
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible styling */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius-sm);
    z-index: 9999;
}

.skip-link:focus {
    top: var(--space-md);
}

/* Loading placeholder */
.loading-placeholder {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-style: italic;
}

/* Hidden utility */
[hidden] {
    display: none !important;
}