/* static/css/main.css */
/* ###############################################################################
   Base settings
   #############################################################################*/
:root {
    /* Color System */
    --primary-color: #4a89dc;
    --primary-hover: #3b7ddb;
    --secondary-color: #64748b;
    --background-primary: #f0f2f5;
    --background-secondary: #f8fafc;
    --surface-primary: #ffffff;
    --surface-secondary: #f9f9f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --overlay-dark: rgba(0, 0, 0, 0.8);
    --overlay-light: rgba(255, 255, 255, 0.95);

    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Spacing */
    --spacing-no: 0rem;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-nm: 1.0rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2.0rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3.0rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Typography */
    --font-family-base: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 3.25rem;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
}

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

body {
    background: var(--background-primary);
    color: var(--text-primary);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ###############################################################################
   Layout
   #############################################################################*/
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--overlay-light);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);

/*
    width: 100%;
    overflow: hidden;
*/
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.main-content {
    background: var(--background-primary);
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.content-area {
    background: var(--background-primary);
    flex: 1;
    min-width: 0;
}

.sidebar {
    width: 300px;
    min-width: 300px;
}

.highlight {
    background-color: yellow;
    animation: fadeout 2s forwards;
}

/* ###############################################################################
   Header
   #############################################################################*/
header {
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    position: relative;
}

header.with-image {
    background-image: url('/static/img/header.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.2));
}

header h1 {
    position: relative;
    z-index: 1;
    color: white;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    font-style: italic;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    text-align: center;
}

/* ###############################################################################
   Footer
   #############################################################################*/
.site-footer {
    display: flex;
    padding: var(--spacing-lg) 0;
    background: var(--surface-secondary);
    color: var(--text-muted);
    position: relative;
    border-top: 1px solid var(--border-color);
}

.footer-logo {
    padding-left: var(--spacing-3xl);
    height: 35px;
}

#privacyLink {
    position: absolute;
    margin-top: var(--spacing-md);
    right: var(--spacing-3xl);
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
}

#privacyLink:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* ###############################################################################
   Breadcrumb Navigation
   #############################################################################*/
.breadcrumb-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-primary);
    margin: var(--spacing-sm) var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    list-style: none;
    margin: 0;
    padding: 0;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    font-size: var(--font-size-sm);
}

.breadcrumb-item:not(:last-child)::after {
    content: "›";
    margin-left: var(--spacing-sm);
    color: var(--text-muted);
    font-weight: 500;
}

.breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-fast);
    font-weight: 500;
}

.breadcrumb-item a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--text-secondary);
    font-weight: 600;
}

.noncontent-links {
    display: flex;
    gap: var(--spacing-md);
}

.noncontent-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: var(--transition-fast);
}

.noncontent-links a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* ###############################################################################
   Accordion Content Sections
   #############################################################################*/
/* Horizontal Accordion Layout Container */
.accordion-info {
    text-align: center;
    margin-bottom: var(--spacing-nm);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
}

.accordion-layout {
    display: flex;
    flex-direction: row; /* Horizontal columns */
    height: 100%;
    position: relative;
}

/* Resizable Accordion Column */
.accordion-column {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--surface-primary);
    border-right: 1px solid var(--border-color);
    min-width: 100px; /* Minimum width for collapsed state */
}

.accordion-column:last-child {
    border-right: none;
}

/* ###############################################################################
   Content Container
   #############################################################################*/
.content-container {
    background: var(--surface-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
    height: 600px; /* Fixed height for resizable sections */
}

/* Column Header */
.column-header {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: move;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 50px;
    flex-shrink: 0;
}

.column-header:hover {
    background: var(--primary-hover);
}

.column-header .resize-icon {
    font-size: var(--font-size-xs);
    opacity: 0.6;
    position: relative; /* Required for positioning the tooltip */
    cursor: help; /* Optional: changes cursor to indicate help */
}

.resize-icon:hover::after {
    /* bar     ←   or   →       to */
    content: "Drag the vertical gray bar \00A0 \00A0 \2190 \00A0 or \00A0 \2192 \00A0 \00A0 \00A0 to resize columns"; /* Tooltip text */
    color: #FFFFFF;
    background: black;
    padding: 5px;
    font-size: var(--font-size-xs);
    white-space: nowrap;
    z-index: 10;
    left: 50%;
    transform: translateX(-50%);
}

/* Vertical Resize Handle (between LEFT and RIGHT columns) */
.resize-handle {
    width: 8px;
    background: var(--border-color);
    cursor: col-resize; /* Column resize cursor */
    position: relative;
    transition: background-color 0.2s ease;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
}

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

.resize-handle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4px;
    height: 40px;
    background: var(--text-muted);
    border-radius: 2px;
    transition: background-color 0.2s ease;
}

.resize-handle:hover::before {
    background: white;
}

/* ###############################################################################
   Guide Column
   #############################################################################*/
.guide-column {
    flex: 0 0 59%; /* Initial width, allows for two columns of images (60 no good) */
}

.guide-column .column-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.guide-column-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-no) var(--spacing-lg) var(--spacing-sm) var(--spacing-lg);
    background: var(--surface-primary);
}

.guide-header {
    position: relative;
    z-index: 1;
    color: var(--primary-color);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    font-style: italic;
    padding-bottom: var(--spacing-sm);
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    text-align: left;
}

.guide-section {
    margin: 5px 0px 0px 0px;
    background: var(--surface-primary);
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.guide-section p {
    margin: 5px 0px 8px 0px;
}

.guide-section-header {
    border-bottom: 2px solid #3498db;
    padding-top: var(--spacing-nm);
    padding-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
    color: var(--secondary-color);
    font-size: var(--font-size-xl);
    font-weight: 500;
    font-style: italic;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    text-align: left;
}

/* ###############################################################################
   Gallery Column
   #############################################################################*/
.gallery-column {
    flex: 1; /* Takes remaining space */
    min-width: 200px;
}

.gallery-column .column-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.gallery-column-content {
    flex: 1;
    overflow-y: auto;
    background: var(--surface-primary);
}

/* ###############################################################################
   Grid Layouts
   #############################################################################*/
.image-grid,
.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

/* ###############################################################################
   Folder & Image Items - Shared Styles
   #############################################################################*/
.folder-item,
.image-item {
    cursor: pointer;
    transition: var(--transition-normal);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    background: var(--surface-primary);
    margin: var(--spacing-no) var(--spacing-sm);
}

.folder-item:hover,
.image-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.folder-thumbnail,
.image-thumbnail {
    height: 150px;
    overflow: hidden;
    background: var(--background-secondary);
    position: relative;
}

.folder-thumbnail img,
.image-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.folder-item:hover .folder-thumbnail img,
.image-item:hover .image-thumbnail img {
    transform: scale(1.05);
}

.folder-name,
.image-title {
    padding: var(--spacing-md);
    text-align: center;
    background: var(--surface-primary);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
    border-top: 1px solid var(--border-color);
}

.folder-overlay {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 32px;
    height: 32px;
    background: transparent;
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs);
    backdrop-filter: none;
}

.folder-overlay img {
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.no-content {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-muted);
    font-style: italic;
    font-size: var(--font-size-lg);
}

/* Resizing States */
.accordion-layout.resizing {
    user-select: none;
}

.accordion-layout.resizing .resize-handle {
    background: var(--primary-color);
}

/* Demo styles */
.demo-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ###############################################################################
   Modal
   #############################################################################*/
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.modal.show {
    opacity: 1;
}

.modal-content {
    position: relative;
    width: 95vw;
    height: 95vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: visible;
}

.modal-image-container {
    position: relative;
    width: calc(95vw - 160px);
    height: calc(95vh - 160px);
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: calc(95vw - 160px);
    max-height: calc(95vh - 160px);
}

.modal-image-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 1;
    transition: opacity var(--transition-slow);
    user-select: none;
    -webkit-user-drag: none;
}

.modal-image-container img.fade-out {
    opacity: 0;
}

/* ###############################################################################
   Modal Controls
   #############################################################################*/
.modal-content .close {
    position: absolute;
    top: 0;
    right: 0;
    color: white;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: var(--transition-normal);
}

.modal-content .close:hover {
    background: rgba(0, 0, 0, 0.8);
    border-color: rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    font-size: var(--font-size-2xl);
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    cursor: pointer;
    z-index: 5;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: rgba(255, 255, 255, 0.3);
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.nav-arrow:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-50%) scale(1.1);
}

.nav-arrow:active {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(0.95);
}

.nav-arrow:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.nav-arrow:disabled:hover {
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.nav-arrow.left {
    left: 0;
}

.nav-arrow.right {
    right: 0;
}

.modal-image-title {
    position: absolute;
    bottom: var(--spacing-xl);
    left: var(--spacing-xl);
    color: white;
    font-size: var(--font-size-xl);
    font-weight: 600;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: calc(95% - 120px);
    word-wrap: break-word;
}
.image-title {
    padding: var(--spacing-md);
    text-align: center;
    background: var(--surface-primary);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
    border-top: 1px solid var(--border-color);
}

.comments-icon {
    position: absolute;
    bottom: var(--spacing-xl);
    right: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.comments-icon:hover {
    background: rgba(0, 0, 0, 0.8);
    border-color: rgba(255, 255, 255, 0.5);
    transform: scale(1.1);
}

.comments-icon img {
    width: 24px;
    height: 24px;
    filter: invert(1);
}

.modal .touch-indicator,
.modal .keyboard-hint {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-xs);
    font-weight: 500;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(15px);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all var(--transition-fast);
    z-index: 1015;
    max-width: calc(100vw - var(--spacing-xl));
    text-align: center;
    line-height: var(--line-height-tight);
    pointer-events: none;
}

.modal .touch-indicator {
    top: var(--spacing-xl);
}

.modal .keyboard-hint {
    bottom: var(--spacing-xl);
}

.modal .touch-indicator.hide,
.modal .keyboard-hint.hide {
    opacity: 0;
    visibility: hidden;
}

/* ###############################################################################
   Ad Containers
   #############################################################################*/
.ad-container {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition-fast);
}

.ad-container:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
}

.ad-top,
.ad-bottom {
    width: 100%;
    height: auto;
    min-height: 200px;
    margin: var(--spacing-md) 0;
}

.ad-sidebar {
    width: 100%;
    height: auto;
    min-height: 200px;
    margin-bottom: var(--spacing-xl);
}

.ad-container ins {
    max-width: 100%;
    min-width: 300px;
}

/* ###############################################################################
   Animations
   #############################################################################*/
@keyframes pulseGlow {
    0%, 100% {
        box-shadow: 0 0 0 rgba(255, 255, 255, 0.3);
    }
    50% {
        box-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
    }
}

@keyframes swipeAnimation {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-8px);
    }
    75% {
        transform: translateX(8px);
    }
}

@keyframes gestureDemo {
    0%, 100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.8);
    }
    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

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

@keyframes fadeout {
  to {
    background-color: transparent;
  }
}