/* ========================================
   Samples Renamer Pro - Modern Web UI
   ======================================== */

:root {
    /* Colors */
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #242424;
    --bg-hover: #2a2a2a;
    --bg-active: #333333;

    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;

    --accent-primary: #6366f1;
    --accent-primary-hover: #4f46e5;
    --accent-secondary: #8b5cf6;
    --accent-success: #22c55e;
    --accent-success-hover: #16a34a;
    --accent-danger: #ef4444;
    --accent-danger-hover: #dc2626;
    --accent-warning: #f59e0b;

    --border-color: #333333;
    --border-light: #444444;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-xl);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    font-size: 0.75rem;
}

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

.desktop-download-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--accent-primary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.desktop-download-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent-secondary);
}

.desktop-download-link svg {
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--accent-primary);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    gap: var(--spacing-xs);
}

.nav-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.nav-btn.active {
    background-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-lg);
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Panels Container */
.panels-container {
    display: grid;
    grid-template-columns: 280px 320px 1fr;
    gap: var(--spacing-lg);
    height: calc(100vh - 140px);
}

/* Panel */
.panel {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.panel-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.panel-toolbar {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.folder-info {
    font-size: 0.75rem;
    color: var(--text-muted);
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Drop Zone */
.drop-zone {
    margin: var(--spacing-sm);
    padding: var(--spacing-lg);
    border: 2px dashed var(--border-light);
    border-radius: var(--radius-md);
    background-color: var(--bg-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.drop-zone:hover {
    border-color: var(--accent-primary);
    background-color: rgba(99, 102, 241, 0.05);
}

.drop-zone.drag-over {
    border-color: var(--accent-success);
    background-color: rgba(34, 197, 94, 0.1);
    transform: scale(1.02);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    pointer-events: none;
}

.drop-zone-content svg {
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.drop-zone:hover .drop-zone-content svg {
    color: var(--accent-primary);
}

.drop-zone.drag-over .drop-zone-content svg {
    color: var(--accent-success);
    transform: scale(1.1);
}

.drop-zone-content p {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0;
}

.drop-zone:hover .drop-zone-content p {
    color: var(--text-primary);
}

.drop-zone .drop-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Folders Section */
.folders-section {
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm);
}

.folders-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.folders-list {
    list-style: none;
    max-height: 100px;
    overflow-y: auto;
}

.folders-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: 2px;
    background-color: var(--bg-tertiary);
}

.folders-list li.empty-state {
    color: var(--text-muted);
    font-style: italic;
    background: none;
    justify-content: center;
}

.folders-list .folder-name {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.folders-list .folder-name svg {
    flex-shrink: 0;
    color: var(--accent-warning);
}

.folders-list .folder-count {
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-right: var(--spacing-xs);
}

.folders-list .remove-folder-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 2px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.folders-list .remove-folder-btn:hover {
    background-color: var(--accent-danger);
    color: var(--text-primary);
}

.file-count-badge {
    font-size: 0.6875rem;
    background-color: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

/* File List */
.file-list-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.file-list {
    list-style: none;
}

.file-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.file-list li::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 2px;
    background-color: var(--border-light);
    flex-shrink: 0;
}

.file-list li:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.file-list li.selected {
    background-color: var(--accent-primary);
    color: var(--text-primary);
}

.file-list li.selected::before {
    background-color: var(--text-primary);
}

.file-list .file-info {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex: 1;
}

.file-list .file-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-list .file-folder {
    font-size: 0.625rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-list li.selected .file-folder {
    color: rgba(255, 255, 255, 0.7);
}

/* Panel Actions */
.panel-actions {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-sm);
}

/* Groups Panel */
.groups-list-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
    max-height: 150px;
}

.groups-list {
    list-style: none;
}

.groups-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.groups-list li:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.groups-list li.selected {
    background-color: var(--accent-secondary);
    color: var(--text-primary);
}

.groups-list .file-count {
    font-size: 0.6875rem;
    background-color: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-full);
}

.groups-list li.selected .file-count {
    background-color: rgba(255, 255, 255, 0.2);
}

.group-actions, .file-actions {
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
}

.file-actions {
    border-bottom: 1px solid var(--border-color);
}

/* Config Section */
.config-section {
    padding: var(--spacing-md);
    flex: 1;
    overflow-y: auto;
}

.config-row {
    margin-bottom: var(--spacing-md);
}

.config-row label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* Date Toggle Button */
.date-toggle-container {
    padding: var(--spacing-sm) var(--spacing-md);
}

.btn-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-toggle.active {
    background-color: var(--accent-success);
    border-color: var(--accent-success);
    color: var(--text-primary);
}

.toggle-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent-danger);
    transition: all var(--transition-fast);
}

.btn-toggle.active .toggle-indicator {
    background-color: var(--text-primary);
}

/* Numbering Section */
.numbering-section {
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.checkbox-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-primary);
}

.checkbox-row label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Rename Actions */
.rename-actions {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-sm);
}

.save-actions {
    padding: 0 var(--spacing-md) var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
}

/* Preview Panel */
.preview-tabs {
    display: flex;
    gap: var(--spacing-xs);
}

.preview-tab {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.preview-tab:hover {
    color: var(--text-secondary);
}

.preview-tab.active {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.preview-container {
    flex: 1;
    overflow: hidden;
}

.preview-content {
    display: none;
    height: 100%;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.preview-content.active {
    display: block;
}

.preview-list {
    list-style: none;
}

.preview-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.preview-list .original {
    color: var(--text-muted);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preview-list .arrow {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.preview-list .new-name {
    color: var(--accent-success);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: right;
}

.preview-list .preview-folder {
    color: var(--accent-warning);
    font-size: 0.625rem;
    font-weight: 500;
}

/* Preview list edit mode selection */
.preview-list li.selected {
    background-color: var(--accent-primary);
    box-shadow: 0 0 0 1px var(--accent-primary);
}

.preview-list li.selected .original {
    color: var(--text-primary);
}

.preview-list.edit-mode li {
    cursor: pointer;
    position: relative;
    padding-left: calc(var(--spacing-md) + 20px);
}

.preview-list.edit-mode li::before {
    content: '';
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-sm);
    background-color: transparent;
    transition: var(--transition-fast);
}

.preview-list.edit-mode li.selected::before {
    background-color: var(--text-primary);
    border-color: var(--text-primary);
}

.preview-list.edit-mode li:hover {
    background-color: var(--bg-hover);
}

.preview-list.edit-mode li.selected:hover {
    background-color: var(--accent-primary-hover);
}

/* Editable preview names in edit mode */
.preview-list.edit-mode .new-name {
    cursor: text;
}

.preview-list.edit-mode .new-name:hover {
    text-decoration: underline;
    text-decoration-style: dashed;
}

.preview-list .edit-name-input {
    flex: 1;
    background-color: var(--bg-secondary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-sm);
    color: var(--accent-success);
    font-size: 0.75rem;
    padding: 2px 6px;
    text-align: right;
    outline: none;
    min-width: 100px;
}

.preview-list .edit-name-input:focus {
    border-color: var(--accent-secondary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.preview-list li.custom-edited .new-name {
    color: var(--accent-warning);
    font-style: italic;
}

.preview-list li.custom-edited .new-name::after {
    content: ' *';
    font-size: 0.625rem;
}

/* Preview Toolbar */
.preview-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-md);
}

.edit-mode-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.edit-mode-toggle input {
    display: none;
}

.toggle-slider {
    width: 36px;
    height: 20px;
    background-color: var(--bg-hover);
    border-radius: var(--radius-full);
    position: relative;
    transition: var(--transition-fast);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.edit-mode-toggle input:checked + .toggle-slider {
    background-color: var(--accent-primary);
}

.edit-mode-toggle input:checked + .toggle-slider::after {
    left: 18px;
    background-color: var(--text-primary);
}

.toggle-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.edit-mode-toggle input:checked ~ .toggle-label {
    color: var(--accent-primary);
}

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

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.7rem;
}

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

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

.selected-count {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-left: var(--spacing-sm);
}

/* Global Preview */
.global-preview-list {
    padding: var(--spacing-sm);
}

.group-preview-section {
    margin-bottom: var(--spacing-lg);
}

.group-preview-header {
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

/* Form Elements */
.text-input, .number-input, .select-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.8125rem;
    transition: all var(--transition-fast);
}

.text-input:focus, .number-input:focus, .select-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.number-input {
    width: auto;
    min-width: 80px;
}

.select-input {
    cursor: pointer;
}

.preset-select-container {
    display: flex;
    gap: var(--spacing-xs);
}

.preset-select-container .select-input {
    flex: 1;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8125rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-primary-hover);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-hover);
}

.btn-success {
    background-color: var(--accent-success);
    color: var(--text-primary);
}

.btn-success:hover:not(:disabled) {
    background-color: var(--accent-success-hover);
}

.btn-danger {
    background-color: var(--accent-danger);
    color: var(--text-primary);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--accent-danger-hover);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.6875rem;
    gap: 4px;
}

.btn-success {
    background-color: var(--accent-success);
    color: var(--text-primary);
}

.btn-success:hover:not(:disabled) {
    background-color: var(--accent-success-hover);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-icon {
    padding: var(--spacing-xs);
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
}

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

.btn-icon.btn-success {
    border-color: var(--accent-success);
    color: var(--accent-success);
}

.btn-icon.btn-success:hover:not(:disabled) {
    background-color: var(--accent-success);
    color: white;
}

.btn-icon:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Date Config Styles */
.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

.date-preview {
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.format-preview {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.example-preview {
    font-size: 0.875rem;
    color: var(--accent-success);
}

/* Presets Tab */
.presets-container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.presets-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.presets-card h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.presets-list {
    list-style: none;
    flex: 1;
    overflow-y: auto;
    max-height: 400px;
}

.presets-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.presets-list li .drag-handle {
    cursor: grab;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: -2px;
    user-select: none;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.presets-list li:hover .drag-handle {
    opacity: 1;
}

.presets-list li .drag-handle:active {
    cursor: grabbing;
}

.presets-list li.dragging {
    opacity: 0.5;
    background-color: var(--bg-active);
}

.presets-list li.drag-over {
    border-top: 2px solid var(--accent-primary);
}

.presets-list li .preset-name {
    flex: 1;
}

.presets-list li:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.presets-list li.selected {
    background-color: var(--accent-primary);
    color: var(--text-primary);
}

.preset-info {
    flex: 1;
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    min-height: 200px;
}

.preset-info .placeholder-text {
    color: var(--text-muted);
    font-style: italic;
}

.preset-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Global Config Tab */
.global-config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.global-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.global-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.global-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.radio-group-inline {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xs);
}

.date-preview-box {
    margin-top: var(--spacing-md);
}

.date-preview-box label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.date-preview-box .date-preview {
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.date-picker {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.date-picker::-webkit-calendar-picker-indicator {
    filter: invert(1);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: toastSlideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 300px;
}

.toast.success {
    border-left: 4px solid var(--accent-success);
}

.toast.error {
    border-left: 4px solid var(--accent-danger);
}

.toast.warning {
    border-left: 4px solid var(--accent-warning);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Tutorial Tab */
.tutorial-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

.tutorial-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.tutorial-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.tutorial-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.tutorial-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.tutorial-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.tutorial-card.highlight {
    border-color: var(--accent-warning);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(245, 158, 11, 0.05) 100%);
}

.tutorial-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.tutorial-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.tutorial-icon.accent-purple {
    background: linear-gradient(135deg, #8b5cf6 0%, #a855f7 100%);
}

.tutorial-icon.accent-green {
    background: linear-gradient(135deg, #22c55e 0%, #10b981 100%);
}

.tutorial-icon.accent-orange {
    background: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
}

.tutorial-icon.accent-blue {
    background: linear-gradient(135deg, #3b82f6 0%, #0ea5e9 100%);
}

.tutorial-icon.accent-yellow {
    background: linear-gradient(135deg, #eab308 0%, #f59e0b 100%);
}

.tutorial-card-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Tutorial Steps */
.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.step {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.step-number {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--accent-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content strong {
    display: block;
    font-size: 0.875rem;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.step-content p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.step-content kbd {
    background-color: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: monospace;
    border: 1px solid var(--border-color);
}

/* Tutorial Content */
.tutorial-content {
    font-size: 0.875rem;
}

.tutorial-desc {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.naming-structure {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.naming-structure code {
    font-size: 0.9375rem;
    color: var(--accent-primary);
}

.example-box {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--accent-success);
}

.example-box.small {
    text-align: center;
    margin-top: var(--spacing-md);
}

.example-box.small code {
    color: var(--accent-success);
}

.example-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.example-list {
    list-style: none;
    margin-bottom: var(--spacing-sm);
}

.example-list li {
    padding: 4px 0;
    color: var(--text-secondary);
}

.example-result {
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

.result-label {
    color: var(--text-muted);
    margin-right: var(--spacing-sm);
}

.example-result code {
    color: var(--accent-success);
    font-weight: 500;
}

/* Tip List */
.tip-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.tip {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.tip-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--accent-success);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6875rem;
    font-weight: 600;
    flex-shrink: 0;
}

.tip strong {
    display: block;
    font-size: 0.875rem;
    margin-bottom: 2px;
    color: var(--text-primary);
}

.tip p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Option Group */
.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.option strong {
    display: block;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.option p {
    color: var(--text-secondary);
    font-size: 0.8125rem;
}

/* Pro Tips */
.pro-tip-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.pro-tip {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
}

.pro-tip-bullet {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent-warning);
    margin-top: 6px;
    flex-shrink: 0;
}

.pro-tip p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.pro-tip strong {
    color: var(--text-primary);
}

/* Welcome Modal */
.welcome-modal-content {
    max-width: 600px;
    padding: 0;
}

.welcome-header {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
}

.welcome-logo {
    margin-bottom: var(--spacing-md);
}

.welcome-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.welcome-header p {
    opacity: 0.9;
}

.welcome-body {
    padding: var(--spacing-xl);
}

.welcome-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.welcome-step {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.welcome-step-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.welcome-step-content strong {
    display: block;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.welcome-step-content p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.welcome-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.welcome-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.feature-check {
    color: var(--accent-success);
    font-weight: bold;
}

.welcome-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.dont-show-again {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--text-muted);
    cursor: pointer;
}

.dont-show-again input {
    accent-color: var(--accent-primary);
}

.welcome-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 1200px) {
    .panels-container {
        grid-template-columns: 1fr 1fr;
    }

    .preview-panel {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .panels-container {
        grid-template-columns: 1fr;
        height: auto;
    }

    .panel {
        min-height: 300px;
    }

    .preview-panel {
        grid-column: span 1;
    }

    .presets-container {
        grid-template-columns: 1fr;
    }
}

/* File Browser Modal */
.file-browser-modal-content {
    max-width: 700px;
    width: 95vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
}

.file-browser-toolbar {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
}

.browser-path {
    flex: 1;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.8125rem;
}

.file-browser-content {
    flex: 1;
    overflow: hidden;
    min-height: 300px;
    max-height: 350px;
}

.file-browser-list {
    height: 100%;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.browser-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
}

.browser-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.browser-item:hover {
    background-color: var(--bg-hover);
}

.browser-item.selected {
    background-color: var(--accent-primary);
    color: white;
}

.browser-item.is-file {
    opacity: 0.5;
    cursor: default;
}

.browser-item-icon {
    flex-shrink: 0;
    color: var(--text-muted);
}

.browser-item.is-dir .browser-item-icon {
    color: var(--accent-warning);
}

.browser-item.selected .browser-item-icon {
    color: white;
}

.browser-item-name {
    flex: 1;
    font-size: 0.875rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.browser-item-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background-color: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.browser-item.selected .browser-item-count {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
}

.file-browser-selection {
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    max-height: 150px;
    overflow-y: auto;
}

.selected-folders-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 0.8125rem;
    font-weight: 500;
}

.selected-folders-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.selected-folders-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
}

.selected-folders-list li.empty-state {
    color: var(--text-muted);
    font-style: italic;
    background: none;
    justify-content: center;
}

.selected-folder-path {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.75rem;
}

.remove-selected-folder {
    background: none;
    border: none;
    color: var(--accent-danger);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.remove-selected-folder:hover {
    background-color: var(--accent-danger);
    color: white;
}

/* Search Results in File Browser */
.search-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.search-results-header strong {
    color: var(--accent-primary);
}

.browser-item.search-result {
    flex-wrap: wrap;
}

.browser-item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.browser-item-path {
    font-size: 0.6875rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
}

.browser-item.selected .browser-item-path {
    color: rgba(255, 255, 255, 0.7);
}

/* Upload Progress */
.upload-progress {
    margin: var(--spacing-sm);
    padding: var(--spacing-lg);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    text-align: center;
}

.upload-progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.upload-progress-bar {
    height: 8px;
    background-color: var(--bg-hover);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.upload-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.upload-progress-percent {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
}

/* Download Button */
.download-section {
    padding: var(--spacing-sm) var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.btn-download {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-success) 0%, #10b981 100%);
    color: white;
    gap: var(--spacing-sm);
}