/* macOS-style GLDF Viewer */

/* CSS Variables for macOS Dark Mode */
:root {
    --bg-window: #1e1e1e;
    --bg-sidebar: #252526;
    --bg-content: #1e1e1e;
    --bg-card: #2d2d2d;
    --bg-card-hover: #363636;
    --bg-input: #3c3c3c;
    --bg-table-header: #252526;

    --border-color: #3d3d3d;
    --border-subtle: #2d2d2d;

    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --text-tertiary: #636366;

    --accent-blue: #0a84ff;
    --accent-blue-hover: #409cff;
    --accent-orange: #ff9f0a;
    --accent-yellow: #ffd60a;
    --accent-green: #30d158;
    --accent-purple: #bf5af2;
    --accent-red: #ff453a;
    --accent-cyan: #64d2ff;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 12px;

    --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", SFMono-Regular, ui-monospace, "Cascadia Mono", Menlo, Monaco, Consolas, monospace;

    --sidebar-width: 220px;
}

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

html, body {
    font-family: var(--font-family);
    background: var(--bg-window);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    height: 100%;
    margin: 0;
    padding: 0;
}

/* App Container - Split View Layout */
/* Note: Final #wrapper styles are at bottom of file for specificity */

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    height: 100%;
    overflow-y: auto;
}

.sidebar-header {
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--border-subtle);
}

.sidebar-header h1 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-header h1 .icon {
    color: var(--accent-orange);
}

.sidebar-section {
    padding: 12px 0;
}

.sidebar-section-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0 16px 8px;
}

.sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
    border-radius: 6px;
    margin: 0 8px;
    font-size: 13px;
    position: relative;
    z-index: 1;
}

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

.sidebar-nav-item.active {
    background: var(--accent-blue);
    color: white;
}

.sidebar-nav-item .icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.sidebar-nav-item .badge {
    margin-left: auto;
    font-size: 11px;
    color: var(--text-tertiary);
}

.sidebar-nav-item.active .badge {
    color: rgba(255,255,255,0.7);
}

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
    min-height: 0; /* Important for flex children with overflow */
}

/* Content Header/Toolbar */
.content-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-content);
    display: flex;
    align-items: center;
    gap: 16px;
}

.content-title {
    font-size: 20px;
    font-weight: 600;
}

.toolbar-actions {
    margin-left: auto;
    display: flex;
    gap: 8px;
}

/* Content Body */
.content-body {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

/* Welcome View (No file loaded) */
.welcome-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    text-align: center;
    padding: 48px;
}

.welcome-icon {
    font-size: 80px;
    color: var(--text-tertiary);
    margin-bottom: 24px;
    transition: color 0.3s ease;
}

.welcome-view.dragging .welcome-icon {
    color: var(--accent-blue);
}

.welcome-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.welcome-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.welcome-divider {
    width: 200px;
    height: 1px;
    background: var(--border-color);
    margin: 16px 0;
}

.welcome-instructions {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 8px;
}

.welcome-or {
    color: var(--text-tertiary);
    font-size: 13px;
    margin: 12px 0;
}

.welcome-buttons {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: transparent;
}

.drop-zone:hover,
.drop-zone.dragging {
    border-color: var(--accent-blue);
    background: rgba(10, 132, 255, 0.05);
}

.drop-zone .icon {
    font-size: 48px;
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

.drop-zone:hover .icon,
.drop-zone.dragging .icon {
    color: var(--accent-blue);
}

.drop-zone p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    border: none;
    font-family: var(--font-family);
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
}

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

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

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-icon {
    padding: 6px 8px;
    background: transparent;
    color: var(--text-secondary);
}

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

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-header .icon {
    font-size: 18px;
}

.card-header h3 {
    font-size: 15px;
    font-weight: 600;
    flex: 1;
}

.card-header .badge {
    font-size: 13px;
    color: var(--text-secondary);
}

.card-body {
    padding: 20px;
}

/* Statistics Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
}

.stat-card .icon {
    font-size: 28px;
    margin-bottom: 12px;
}

.stat-card .icon.blue { color: var(--accent-blue); }
.stat-card .icon.yellow { color: var(--accent-yellow); }
.stat-card .icon.purple { color: var(--accent-purple); }
.stat-card .icon.orange { color: var(--accent-orange); }
.stat-card .icon.green { color: var(--accent-green); }

.stat-card .value {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-card .label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Product Info Card */
.product-info-card {
    margin-bottom: 24px;
}

.product-info-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: 16px;
}

.product-info-header .icon {
    font-size: 40px;
    color: var(--accent-orange);
}

.product-info-header h2 {
    font-size: 22px;
    font-weight: 600;
}

.product-info-header .format-version {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.info-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-row .label {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.info-row .value {
    font-size: 14px;
}

/* Content Columns Layout */
.content-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.content-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Collapsible Sections */
.collapsible {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.collapsible-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.collapsible-header:hover {
    background: var(--bg-card-hover);
}

.collapsible-header .icon {
    font-size: 16px;
}

.collapsible-header .icon.blue { color: var(--accent-blue); }
.collapsible-header .icon.yellow { color: var(--accent-yellow); }
.collapsible-header .icon.purple { color: var(--accent-purple); }
.collapsible-header .icon.orange { color: var(--accent-orange); }
.collapsible-header .icon.green { color: var(--accent-green); }

.collapsible-header h4 {
    font-size: 14px;
    font-weight: 600;
    flex: 1;
}

.collapsible-header .count {
    font-size: 13px;
    color: var(--text-secondary);
}

.collapsible-header .chevron {
    color: var(--text-tertiary);
    font-size: 12px;
    transition: transform 0.2s ease;
}

.collapsible.open .chevron {
    transform: rotate(90deg);
}

.collapsible-content {
    padding: 0 16px 16px;
}

/* File List Items */
.file-category {
    margin-bottom: 12px;
}

.file-category-title {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 0;
}

.file-item .icon {
    font-size: 14px;
    width: 20px;
    text-align: center;
}

.file-item .name {
    font-family: var(--font-mono);
    font-size: 13px;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item .type {
    font-size: 11px;
    color: var(--text-tertiary);
}

.more-items {
    font-size: 12px;
    color: var(--text-tertiary);
    padding-left: 30px;
    margin-top: 4px;
}

/* Light Source Items */
.light-source-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
}

.light-source-item .icon {
    font-size: 14px;
    width: 20px;
    text-align: center;
    margin-top: 2px;
}

.light-source-item .info {
    flex: 1;
}

.light-source-item .name {
    font-size: 13px;
    font-weight: 500;
}

.light-source-item .id {
    font-size: 11px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

/* Variant Items */
.variant-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-subtle);
}

.variant-item:last-child {
    border-bottom: none;
}

.variant-item-header {
    display: flex;
    align-items: center;
    gap: 10px;
}

.variant-item .icon {
    font-size: 14px;
    color: var(--accent-purple);
}

.variant-item .name {
    font-size: 13px;
    font-weight: 500;
}

.variant-item .description {
    font-size: 12px;
    color: var(--text-secondary);
    padding-left: 24px;
    margin-top: 4px;
}

.variant-item .id {
    font-size: 10px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    padding-left: 24px;
    margin-top: 2px;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 10px 12px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-table-header);
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    padding: 10px 12px;
    font-size: 13px;
    border-bottom: 1px solid var(--border-subtle);
}

.data-table tr:hover td {
    background: var(--bg-card-hover);
}

/* Filter Tabs / Segmented Control */
.segmented-control {
    display: inline-flex;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: 2px;
}

.segmented-control button {
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 500;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s ease;
    font-family: var(--font-family);
}

.segmented-control button:hover {
    color: var(--text-primary);
}

.segmented-control button.active {
    background: var(--bg-card);
    color: var(--text-primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* Form Elements */
input, select, textarea {
    font-family: var(--font-family);
    font-size: 13px;
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    width: 100%;
    transition: border-color 0.15s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
}

textarea {
    resize: vertical;
    min-height: 100px;
    font-family: var(--font-mono);
}

label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group {
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

/* JSON/Code Display */
.code-block {
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 12px;
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state .icon {
    font-size: 48px;
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 13px;
}

/* Privacy Note */
.privacy-note {
    font-size: 12px;
    color: var(--accent-green);
    font-style: italic;
}

/* LDT Viewer Container */
.ldt-viewer {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.ldt-viewer-controls {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.ldt-diagram {
    padding: 16px;
    display: flex;
    justify-content: center;
}

.ldt-diagram svg {
    max-width: 100%;
    height: auto;
}

/* L3D Viewer Container */
.l3d-container {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    width: 100%;
    min-height: 400px;
    margin-bottom: 16px;
}

.l3d-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: 8px;
}

.l3d-header .icon {
    color: var(--accent-green);
}

.l3d-header .name {
    font-size: 13px;
    font-weight: 500;
}

.l3d-canvas-container {
    position: relative;
    background: #1a1a1a;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.l3d-canvas-container canvas {
    display: block;
}

/* L3D Viewer component styling */
.l3d-viewer {
    background: #1a1a1a;
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}

.l3d-viewer canvas {
    border-radius: var(--radius-sm);
    background: #2a2a2a;
}

.l3d-viewer p {
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-tertiary);
}

/* File Preview */
.preview-tile {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 20px;
}

.preview-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: 12px;
}

.preview-header .icon {
    font-size: 20px;
    color: var(--accent-blue);
}

.preview-name {
    font-size: 15px;
    font-weight: 600;
}

.preview-type {
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: auto;
}

.preview-media {
    padding: 20px;
}

.preview-media img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-sm);
}

.preview-media video {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-sm);
}

.preview-media textarea {
    width: 100%;
    min-height: 200px;
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    resize: vertical;
}

/* Embedded Files Section */
#buf_file {
    padding: 12px;
    margin: 8px 0;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
}

#buf_file p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-family: var(--font-mono);
}

#buf_file img {
    max-width: 200px;
    max-height: 200px;
    border-radius: var(--radius-sm);
}

/* URL Files Section */
.url-files {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
}

.url-file-entry {
    background: var(--bg-input);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    margin: 6px 0;
}

.url-file-entry p {
    font-size: 12px;
    margin-bottom: 4px;
}

.url-file-entry a {
    font-size: 12px;
    color: var(--accent-blue);
    text-decoration: none;
}

.url-file-entry a:hover {
    text-decoration: underline;
}

/* Editor Tabs */
.editor-tabs-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.editor-nav {
    display: flex;
    background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.nav-tab {
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s ease;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    font-family: var(--font-family);
}

.nav-tab:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.nav-tab.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
    background: var(--bg-card);
}

.editor-content {
    padding: 24px;
}

.editor-section h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 8px;
}

.section-description {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Mode Toggle & Export Buttons */
.mode-toggle {
    display: flex;
    justify-content: center;
    gap: 12px;
    padding: 16px 0;
    flex-wrap: wrap;
}

.toggle-btn {
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s ease;
    background: var(--accent-blue);
    color: white;
    font-family: var(--font-family);
}

.toggle-btn:hover {
    background: var(--accent-blue-hover);
}

.toggle-btn.active {
    background: var(--accent-blue);
}

.export-btn {
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s ease;
    background: var(--accent-green);
    color: white;
    font-family: var(--font-family);
}

.export-btn:hover {
    opacity: 0.9;
}

/* Files Table */
.files-table {
    width: 100%;
    border-collapse: collapse;
}

.files-table th,
.files-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
}

.files-table th {
    background: var(--bg-table-header);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.files-table td {
    font-size: 13px;
}

.files-table .filename {
    font-family: var(--font-mono);
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.files-table .actions {
    white-space: nowrap;
}

/* Button Variants */
.btn-edit, .btn-remove, .btn-save, .btn-cancel, .btn-add {
    padding: 6px 12px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    margin-right: 4px;
    font-family: var(--font-family);
}

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

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

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

.btn-cancel {
    background: var(--bg-input);
    color: var(--text-primary);
}

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

.btn-edit:disabled,
.btn-add:disabled {
    background: var(--bg-input);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

/* Light Source & Variant Cards */
.light-source-cards,
.variant-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.light-source-card,
.variant-card {
    background: var(--bg-input);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: rgba(0,0,0,0.2);
}

.card-id {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent-cyan);
}

.card-type {
    font-size: 11px;
    padding: 3px 8px;
    background: var(--accent-blue);
    color: white;
    border-radius: 4px;
}

.card-type.changeable {
    background: var(--accent-orange);
}

.card-content {
    padding: 14px;
}

.card-content h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
}

.card-content .description {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.card-content .detail {
    display: flex;
    font-size: 12px;
    margin-bottom: 4px;
}

.card-content .detail .label {
    color: var(--text-tertiary);
    margin-right: 6px;
}

.card-actions-row {
    padding: 10px 14px;
    border-top: 1px solid var(--border-subtle);
    text-align: right;
}

/* Fieldset */
fieldset {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin: 16px 0;
}

fieldset legend {
    color: var(--text-secondary);
    font-size: 12px;
    padding: 0 8px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.tab {
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
    font-size: 13px;
    font-family: var(--font-family);
}

.tab:hover {
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

.tab.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

/* Tags */
.tag {
    display: inline-block;
    font-size: 11px;
    padding: 3px 8px;
    background: var(--bg-input);
    color: var(--text-secondary);
    border-radius: 4px;
    margin: 2px;
}

/* Links */
a {
    color: var(--accent-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Footer */
.app-footer {
    margin-top: 24px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.app-footer p {
    font-size: 12px;
    color: var(--text-tertiary);
    margin: 0;
}

/* Hidden file input */
input#file-upload {
    visibility: hidden;
    position: absolute;
    width: 0;
    height: 0;
}

/* Responsive Adjustments */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .content-columns {
        grid-template-columns: 1fr;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    #wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .sidebar-section {
        padding: 8px 0;
    }

    .sidebar-nav-item {
        padding: 6px 12px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .editor-nav {
        flex-wrap: wrap;
    }

    .nav-tab {
        padding: 10px 14px;
        font-size: 12px;
    }
}

/* ============================================ */
/* Legacy compatibility for existing HTML */
/* ============================================ */

/* App Header - redesign for centered welcome when no file */
.app-header {
    display: none; /* Hide old header, we'll use sidebar */
}

/* Info Section - integrate into welcome view */
.info-section {
    display: none; /* Moved to welcome view */
}

/* Upload Section - now part of welcome/main content */
.upload-section {
    margin-bottom: 0;
}

#drop-container {
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: transparent;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
}

#drop-container:hover {
    background: rgba(10, 132, 255, 0.05);
    border-color: var(--accent-blue);
}

#drop-container i {
    font-size: 40px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

#drop-container:hover i {
    color: var(--accent-blue);
}

#drop-container p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 14px;
    text-align: center;
}

/* Preview Area */
#preview-area {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#content-area {
    padding: 0;
}

/* Override wrapper for new layout */
#wrapper {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: row;
    height: 100vh;
}