/* Base Browser Layout Components — BEM
 * Unified browser/list-view styles using design tokens.
 * Based on patterns from file-browser.js and file-management.css.
 */

/* Browser container */
.browser {
    display: flex;
    height: 100%;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

/* Header / toolbar area */
.browser__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

/* Sidebar / tree panel */
.browser__sidebar {
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width-expanded);
    min-width: var(--sidebar-width-collapsed);
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    flex-shrink: 0;
}

/* Main content area */
.browser__main {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

/* List container */
.browser__list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2);
}

/* Individual list item */
.browser__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.15s ease;
    color: var(--color-text-secondary);
    font-size: var(--text-base);
}

.browser__item:hover {
    background: var(--color-surface-hover);
}

.browser__item--active {
    background: var(--color-surface-active);
    color: var(--color-text);
}

.browser__item--selected {
    background: var(--color-surface-active);
    border: 1px solid var(--color-accent);
}

/* Item icon */
.browser__item-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--height-icon);
    height: var(--height-icon);
    font-size: var(--text-md);
    color: var(--color-accent);
    flex-shrink: 0;
}

/* Item title */
.browser__item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

/* Item meta (date, size, etc.) */
.browser__item-meta {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    flex-shrink: 0;
}

/* Empty state */
.browser__empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    color: var(--color-text-muted);
    text-align: center;
}

.browser__empty-icon {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.browser__empty-text {
    font-size: var(--text-base);
}

/* Loading state */
.browser__loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    color: var(--color-text-muted);
}

.browser__loading-spinner {
    font-size: var(--text-2xl);
    color: var(--color-accent);
    margin-bottom: var(--space-4);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* List-view variant (no sidebar) */
.browser--list-view {
    flex-direction: column;
}

/* Toolbar area (search, filters, actions) */
.browser__toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

/* Search input */
.browser__search-input {
    flex: 1;
    padding: var(--space-1\.5) var(--space-2\.5);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-surface-active);
    border-radius: 4px;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.browser__search-input:focus {
    outline: none;
    border-color: var(--color-accent-hover);
    background-color: var(--color-surface);
    color: var(--color-text-muted);
}

/* Select-all control */
.browser__select-all {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1\.5) var(--space-2\.5);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-surface-active);
    border-radius: 4px;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    user-select: none;
}

.browser__select-all input[type="checkbox"] {
    width: var(--space-4);
    height: var(--space-4);
    accent-color: var(--color-accent-hover);
    cursor: pointer;
    margin: 0;
    background-color: var(--color-surface-elevated);
}

/* Header button (e.g. create new) */
.browser__header-btn {
    padding: var(--space-2) var(--space-2\.5);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-surface-active);
    border-radius: 4px;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.browser__header-btn:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
    transform: translateY(-1px);
}

.browser__header-btn i {
    font-size: var(--text-base);
}

/* Item checkbox */
.browser__checkbox {
    width: var(--space-4);
    height: var(--space-4);
    accent-color: var(--color-accent-hover);
    cursor: pointer;
    margin: 0;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.browser__item:hover .browser__checkbox,
.browser__checkbox:checked {
    opacity: 1;
}

/* Item info block (title + meta stacked) */
.browser__item-info {
    flex: 1;
    min-width: 0;
}

.browser__item-info .browser__item-title {
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-bottom: var(--space-1);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.browser__item-info .browser__item-meta {
    display: flex;
    gap: var(--space-3);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    flex-shrink: initial;
}

/* Item > direct icon (type icon next to checkbox) */
.browser__item > i {
    color: var(--color-accent-hover);
    font-size: var(--text-lg);
    width: 22px;
    text-align: center;
    flex-shrink: 0;
}

/* File type icon colors */
.browser__item i.fa-file-pdf { color: #e74c3c; }
.browser__item i.fa-file-excel { color: #27ae60; }
.browser__item i.fa-file-word { color: #3498db; }
.browser__item i.fa-file-csv { color: #95a5a6; }
.browser__item i.fa-image { color: #9b59b6; }
.browser__item i.fa-book { color: #f39c12; }

/* Selected item styling */
.browser__item--selected {
    background: rgba(76, 175, 80, 0.08);
    border-color: var(--color-accent-hover);
}

.browser__item--selected .browser__item-title {
    color: var(--color-accent-hover);
}

.browser__item--selected .browser__checkbox {
    opacity: 1;
}

/* Item hover with border shift */
.browser__item:hover {
    border-color: var(--color-accent-hover);
    background-color: var(--color-surface-hover);
    transform: translateX(2px);
}

/* Item action buttons (show on hover) */
.browser__item-actions {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.browser__item:hover .browser__item-actions {
    opacity: 1;
}

.browser__action-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: 4px;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.browser__action-btn i {
    font-size: var(--text-base);
}

.browser__action-btn--share {
    color: var(--base-green, #4CAF50);
}

.browser__action-btn--share:hover {
    background: rgba(76, 175, 80, 0.1);
    transform: scale(1.1);
}

.browser__action-btn--open {
    color: var(--color-accent-hover);
}

.browser__action-btn--open:hover {
    background: rgba(76, 175, 80, 0.1);
    transform: scale(1.1);
}

.browser__action-btn--delete {
    color: #dc3545;
}

.browser__action-btn--delete:hover {
    background: rgba(220, 53, 69, 0.1);
    transform: scale(1.1);
}

/* Bulk action toolbar (sticky bottom bar) */
.browser__bulk-toolbar {
    position: sticky;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to right, var(--color-surface-elevated), var(--color-surface));
    border-top: 2px solid var(--color-accent-hover);
    padding: 9px 15px;
    display: none;
    align-items: center;
    gap: 15px;
    backdrop-filter: blur(10px);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
    z-index: 10;
}

.browser__bulk-toolbar.visible {
    display: flex;
}

.browser__bulk-toolbar-count {
    color: var(--color-accent-hover);
    font-weight: 600;
    font-size: var(--text-base);
}

.browser__bulk-toolbar-actions {
    display: flex;
    gap: var(--space-2\.5);
    margin-left: auto;
}

.browser__bulk-toolbar-btn {
    background: var(--color-border-strong);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-text-muted);
    padding: var(--space-1\.5) 14px;
    border-radius: 4px;
    cursor: pointer;
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: var(--space-1\.5);
    transition: all 0.2s ease;
}

.browser__bulk-toolbar-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.browser__bulk-toolbar-btn i {
    font-size: var(--text-xs);
}

.browser__bulk-toolbar-btn--open {
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
}

.browser__bulk-toolbar-btn--open:hover {
    background: rgba(76, 175, 80, 0.2);
}

.browser__bulk-toolbar-btn--download {
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
}

.browser__bulk-toolbar-btn--download:hover {
    background: rgba(76, 175, 80, 0.2);
}

.browser__bulk-toolbar-btn--delete {
    border-color: #dc3545;
    color: #dc3545;
}

.browser__bulk-toolbar-btn--delete:hover {
    background: rgba(220, 53, 69, 0.2);
}

.browser__bulk-toolbar-btn--workspace {
    border-color: #3993f3;
    color: #3993f3;
}

.browser__bulk-toolbar-btn--workspace:hover {
    background: rgba(0, 123, 255, 0.2);
}

.browser__bulk-toolbar-btn--share {
    border-color: #ffc107;
    color: #ffc107;
}

.browser__bulk-toolbar-btn--share:hover {
    background: rgba(255, 193, 7, 0.2);
}

/* =========================================================================
   Two-pane layout variant (sidebar + main)
   ========================================================================= */

.browser--two-pane {
    flex-direction: row;
}

/* Sidebar collapse toggle */
.browser__sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    width: 100%;
    padding: var(--space-1\.5) var(--space-2);
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: var(--text-xs);
    transition: color 0.2s ease, background 0.2s ease;
    flex-shrink: 0;
    box-sizing: border-box;
}

.browser__sidebar-toggle:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.browser__sidebar-toggle i {
    transition: transform 0.2s ease;
}

/* Sidebar collapsed state */
.browser__sidebar--collapsed {
    width: var(--height-input) !important;
    min-width: var(--height-input) !important;
    overflow: hidden;
}

.browser__sidebar--collapsed .browser__sidebar-content {
    display: none;
}

.browser__sidebar--collapsed .browser__sidebar-toggle {
    justify-content: center;
    padding: var(--space-1\.5) 0;
}

.browser__sidebar--collapsed .browser__sidebar-toggle i {
    transform: rotate(180deg);
}

/* Sidebar content wrapper (scrollable area below toggle) */
.browser__sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

/* Sidebar resize handle */
.browser__sidebar-resize {
    position: absolute;
    top: 0;
    right: -3px;
    width: var(--space-1\.5);
    height: 100%;
    cursor: col-resize;
    z-index: 5;
    background: transparent;
    transition: background 0.15s ease;
}

.browser__sidebar-resize:hover,
.browser__sidebar-resize--active {
    background: var(--color-accent);
    opacity: 0.5;
}

/* Make sidebar position relative for resize handle */
.browser--two-pane .browser__sidebar {
    position: relative;
    transition: width 0.15s ease;
}

/* During active resize, disable transition and text selection */
.browser--resizing .browser__sidebar {
    transition: none;
}

.browser--resizing {
    user-select: none;
    cursor: col-resize;
}

/* Sidebar header (e.g. repo dropdown, title) */
.browser__sidebar-header {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

/* Sidebar tree items */
.browser__tree-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 4px var(--space-3);
    cursor: pointer;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    transition: background 0.15s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.browser__tree-item:hover {
    background: var(--color-surface-hover);
}

.browser__tree-item--active {
    background: var(--color-surface-active);
    color: var(--color-text);
    font-weight: 500;
}

.browser__tree-item i {
    font-size: var(--text-xs);
    width: var(--space-4);
    text-align: center;
    flex-shrink: 0;
    color: var(--color-text-muted);
}

.browser__tree-item--active i {
    color: var(--color-accent);
}

/* Tree indentation levels */
.browser__tree-item--level-1 { padding-left: calc(var(--space-3) + 16px); }
.browser__tree-item--level-2 { padding-left: calc(var(--space-3) + 32px); }
.browser__tree-item--level-3 { padding-left: calc(var(--space-3) + 48px); }

/* Tree section header */
.browser__tree-section {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px var(--space-3);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    user-select: none;
}

.browser__tree-section:hover {
    color: var(--color-text-secondary);
}

.browser__tree-section i {
    font-size: var(--text-2xs);
    transition: transform 0.2s ease;
}

.browser__tree-section--collapsed i {
    transform: rotate(-90deg);
}

/* Context menu */
.browser__context-menu {
    position: fixed;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    min-width: 160px;
    z-index: 1000;
    padding: var(--space-1) 0;
}

.browser__context-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1\.5) var(--space-3);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: background 0.15s ease;
}

.browser__context-menu-item:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.browser__context-menu-item--danger {
    color: #dc3545;
}

.browser__context-menu-item--danger:hover {
    background: rgba(220, 53, 69, 0.1);
}

.browser__context-menu-item i {
    width: var(--space-4);
    text-align: center;
    font-size: var(--text-xs);
}

.browser__context-menu-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-1) 0;
}

/* Preview pane (for two-pane browsers showing file content) */
.browser__preview {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.browser__preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--space-3);
    margin-bottom: var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.browser__preview-title {
    font-size: var(--text-md);
    font-weight: 600;
    color: var(--color-text);
}

.browser__preview-content {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.browser__preview-content pre {
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-3);
    overflow-x: auto;
    font-size: var(--text-sm);
    line-height: 1.4;
}

/* Welcome / placeholder pane */
.browser__welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--space-8);
    color: var(--color-text-muted);
    text-align: center;
}

.browser__welcome-icon {
    font-size: 48px;
    margin-bottom: var(--space-4);
    opacity: 0.4;
}

.browser__welcome-text {
    font-size: var(--text-md);
    margin-bottom: var(--space-2);
}

.browser__welcome-hint {
    font-size: var(--text-sm);
    opacity: 0.7;
}

/* Modal overlay (shared for all browser modals) */
.browser__modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(2px);
}

.browser__modal {
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    min-width: 400px;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.browser__modal-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.browser__modal-input {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: var(--text-sm);
    margin-bottom: var(--space-3);
    box-sizing: border-box;
}

.browser__modal-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.browser__modal-select {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: var(--text-sm);
    margin-bottom: var(--space-3);
    box-sizing: border-box;
}

.browser__modal-actions {
    display: flex;
    gap: var(--space-2);
    justify-content: flex-end;
    margin-top: var(--space-4);
}

.browser__modal-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-size: var(--text-sm);
    transition: all 0.2s ease;
}

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

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

.browser__modal-btn--cancel {
    background: var(--color-surface);
    color: var(--color-text-secondary);
}

.browser__modal-btn--cancel:hover {
    background: var(--color-surface-hover);
}

.browser__modal-btn--danger {
    background: #dc3545;
    border-color: #dc3545;
    color: white;
}

.browser__modal-btn--danger:hover {
    background: #c82333;
}