/* ==========================================================================
   Convert/Sheet — Custom Premium Design System
   Color Palette: Obsidian & Warm Amber (Dark) | Sand & Cocoa (Light)
   ========================================================================== */

   :root {
    /* Font Families */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, monospace;

    /* Theme Transition */
    --theme-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Dark Mode Variables (Default) */
    --bg-primary: #08090b;
    --bg-card: #0e1115;
    --bg-header: #0a0c0e;
    --border-color: #1a1e24;
    --border-hover: #2d333f;
    
    --text-primary: #f4f4f5;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    --accent: #f59e0b; /* Amber */
    --accent-hover: #d97706;
    --accent-rgb: 245, 158, 11;
    --accent-muted: rgba(245, 158, 11, 0.08);

    --success: #10b981;
    --success-muted: rgba(16, 185, 129, 0.1);
    --danger: #ef4444;
    --danger-muted: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-muted: rgba(59, 130, 246, 0.1);

    --shadow-main: 0 4px 20px rgba(0, 0, 0, 0.35);
    --shadow-focus: 0 0 0 3px rgba(245, 158, 11, 0.2);
    --shadow-danger: 0 0 0 3px rgba(239, 68, 68, 0.2);

    --input-bg: #11141a;
}

[data-bs-theme="light"] {
    /* Light Mode Variables */
    --bg-primary: #faf9f6; /* Soft warm-white/sand */
    --bg-card: #ffffff;
    --bg-header: #f3f1eb;
    --border-color: #e2dfd8;
    --border-hover: #cbc7bd;
    
    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --text-muted: #878680;

    --accent: #d97706; /* Darker amber for readability */
    --accent-hover: #b45309;
    --accent-rgb: 217, 119, 6;
    --accent-muted: rgba(217, 119, 6, 0.06);

    --success: #059669;
    --success-muted: rgba(5, 150, 105, 0.08);
    --danger: #dc2626;
    --danger-muted: rgba(220, 38, 38, 0.08);
    --info: #2563eb;
    --info-muted: rgba(37, 99, 235, 0.08);

    --shadow-main: 0 4px 24px rgba(27, 25, 23, 0.06);
    --shadow-focus: 0 0 0 3px rgba(217, 119, 6, 0.15);
    --shadow-danger: 0 0 0 3px rgba(220, 38, 38, 0.15);

    --input-bg: #fdfdfc;
}

/* ==========================================================================
   Global & Base Styles
   ========================================================================== */

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    transition: var(--theme-transition);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

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

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 1.5rem 3rem 1.5rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--theme-transition);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-symbol {
    color: var(--accent);
    font-size: 1.35rem;
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.logo-text strong {
    font-weight: 800;
    color: var(--accent);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Action Icons */
.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 8px;
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--theme-transition);
}

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

.btn-icon:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

/* GitHub Profile Badge */
.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0 0.85rem;
    height: 38px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--theme-transition);
}

.github-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-muted);
}

/* ==========================================================================
   Panel Card Layouts
   ========================================================================== */

.workspace-section {
    margin-bottom: 1.5rem;
}

.panel-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: var(--shadow-main);
    transition: var(--theme-transition);
    display: flex;
    flex-direction: column;
}

.panel-card:hover {
    border-color: var(--border-hover);
}

/* Card Header */
.card-header-compact {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px dashed var(--border-color);
}

.card-title-compact {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}

.status-indicator {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    background: var(--border-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* State Modifier styles */
.badge.text-bg-secondary {
    background: var(--border-color) !important;
    color: var(--text-secondary) !important;
}

.badge.text-bg-info {
    background: var(--info-muted) !important;
    color: var(--info) !important;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.badge.text-bg-success {
    background: var(--success-muted) !important;
    color: var(--success) !important;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge.text-bg-danger {
    background: var(--danger-muted) !important;
    color: var(--danger) !important;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ==========================================================================
   Column 1: Drag and Drop Zone
   ========================================================================== */

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    min-height: 195px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--theme-transition);
    position: relative;
    background: var(--input-bg);
}

.drop-zone-content {
    text-align: center;
    padding: 1.5rem;
    pointer-events: none;
}

.drop-zone-icon {
    font-size: 2.2rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.drop-zone-title {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.drop-zone-subtitle {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

/* Hover & Active Drag States */
.drop-zone:hover {
    border-color: var(--accent);
    background: var(--accent-muted);
}

.drop-zone:hover .drop-zone-icon {
    transform: translateY(-4px);
    color: var(--accent);
}

.drop-zone.is-dragover {
    border-color: var(--accent);
    background: var(--accent-muted);
    box-shadow: var(--shadow-focus);
}

.drop-zone.is-valid {
    border-color: var(--success);
    background: var(--success-muted);
}

.drop-zone.is-valid .drop-zone-icon {
    color: var(--success);
}

.drop-zone.is-invalid {
    border-color: var(--danger);
    background: var(--danger-muted);
}

.drop-zone.is-invalid .drop-zone-icon {
    color: var(--danger);
}

/* ==========================================================================
   Column 2: Statistics Card
   ========================================================================== */

.stats-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    flex-grow: 1;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.stat-value {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.max-w-150 {
    max-width: 150px;
    display: inline-block;
}

.file-summary-wrapper {
    display: flex;
    align-items: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border-color);
}

/* ==========================================================================
   Column 3: Actions Card
   ========================================================================== */

.action-buttons-group {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

/* Custom Styled Buttons */
.btn-primary-action,
.btn-secondary-action,
.btn-danger-action {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--theme-transition);
    width: 100%;
}

/* Primary Amber Button */
.btn-primary-action {
    background-color: var(--accent);
    border: 1px solid var(--accent);
    color: #0d0900; /* Dark contrast */
}

.btn-primary-action:hover:not(:disabled) {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 0 12px rgba(245, 158, 11, 0.3);
}

.btn-primary-action:disabled {
    background-color: var(--border-color);
    border-color: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
}

/* Secondary Action Button */
.btn-secondary-action {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

/* Danger Reset Button */
.btn-danger-action {
    background-color: transparent;
    border: 1px solid rgba(239, 68, 68, 0.25);
    color: var(--danger);
}

.btn-danger-action:hover {
    background-color: var(--danger);
    border-color: var(--danger);
    color: #ffffff;
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.3);
}

/* Progress Panel Styling */
.progress-panel-wrapper {
    margin-top: 0.75rem;
    padding: 0.5rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.progress-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.progress-spinner {
    color: var(--accent);
    display: flex;
    animation: rotate 1.2s linear infinite;
}

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

.progress-bar-container {
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--accent);
    width: 0%;
    transition: width 0.2s ease;
}

/* ==========================================================================
   Configuration Toolbar
   ========================================================================== */

.toolbar-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: var(--shadow-main);
}

.toolbar-title-bar {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px dashed var(--border-color);
}

.toolbar-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.option-field {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.option-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* Custom Select Dropdowns */
.select-wrapper {
    position: relative;
    width: 100%;
}

.option-select {
    width: 100%;
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    appearance: none;
    cursor: pointer;
    transition: var(--theme-transition);
}

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

.option-select:focus:not(:disabled) {
    outline: none;
    border-color: var(--accent);
    box-shadow: var(--shadow-focus);
}

.select-wrapper::after {
    content: "\F2E5"; /* Bootstrap Icon Chevron Down */
    font-family: "bootstrap-icons";
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: var(--theme-transition);
}

.option-select:focus + .select-wrapper::after {
    color: var(--accent);
}

.select-wrapper.custom-select-ready::after {
    content: none;
}

.native-select-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.custom-select {
    position: relative;
    width: 100%;
    z-index: 4;
}

.custom-select.is-open {
    z-index: 40;
}

.custom-select-button {
    width: 100%;
    min-height: 38px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background:
        linear-gradient(180deg, rgba(var(--accent-rgb), 0.05), transparent 72%),
        var(--input-bg);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: var(--theme-transition);
}

.custom-select-button:hover {
    border-color: var(--border-hover);
    background:
        linear-gradient(180deg, rgba(var(--accent-rgb), 0.08), transparent 72%),
        var(--input-bg);
}

.custom-select-button:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: var(--shadow-focus);
}

.custom-select.is-open .custom-select-button {
    border-color: var(--accent);
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
    box-shadow: var(--shadow-focus);
}

.custom-select.is-disabled .custom-select-button {
    opacity: 0.72;
    cursor: not-allowed;
    box-shadow: none;
}

.custom-select-value {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: inherit;
}

.custom-select-icon {
    flex: 0 0 auto;
    color: var(--text-secondary);
    font-size: 0.78rem;
    transition: var(--theme-transition);
}

.custom-select.is-open .custom-select-icon {
    color: var(--accent);
    transform: rotate(180deg);
}

.custom-select-list {
    position: absolute;
    top: calc(100% + 0.35rem);
    left: 0;
    right: 0;
    max-height: 240px;
    overflow-y: auto;
    padding: 0.35rem;
    border: 1px solid var(--border-hover);
    border-radius: 8px;
    background: var(--bg-card);
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px) scale(0.98);
    transform-origin: top center;
    transition: opacity 0.16s ease, transform 0.16s ease;
}

.custom-select.is-open .custom-select-list {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.custom-select-option {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.55rem 0.65rem;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: var(--theme-transition);
}

.custom-select-option::before {
    content: "";
    width: 0.42rem;
    height: 0.42rem;
    border-radius: 999px;
    background: transparent;
    box-shadow: inset 0 0 0 1px var(--border-hover);
    transition: var(--theme-transition);
}

.custom-select-option:hover,
.custom-select-option.is-highlighted {
    color: var(--text-primary);
    background: var(--accent-muted);
}

.custom-select-option.is-selected {
    color: var(--accent);
    background: rgba(var(--accent-rgb), 0.1);
}

.custom-select-option.is-selected::before {
    background: var(--accent);
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.15);
}

.custom-select-option:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* Custom Modern Toggles Row */
.toolbar-toggles-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.custom-switch-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.custom-switch-input {
    display: none;
}

.custom-switch-slider {
    width: 32px;
    height: 18px;
    background-color: var(--border-color);
    border: 1px solid var(--border-color);
    border-radius: 9px;
    position: relative;
    transition: var(--theme-transition);
}

.custom-switch-slider::before {
    content: "";
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--text-secondary);
    left: 2px;
    top: 2px;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.2s;
}

.custom-switch-input:checked + .custom-switch-slider {
    background-color: var(--accent-muted);
    border-color: var(--accent);
}

.custom-switch-input:checked + .custom-switch-slider::before {
    transform: translateX(14px);
    background-color: var(--accent);
}

.custom-switch-text {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--theme-transition);
}

.custom-switch-label:hover .custom-switch-text {
    color: var(--text-primary);
}

.custom-switch-label:hover .custom-switch-slider::before {
    background-color: var(--text-primary);
}

.custom-switch-input:checked:hover + .custom-switch-slider::before {
    background-color: var(--accent-hover);
}

/* ==========================================================================
   Split Panels: Left Grid Preview
   ========================================================================== */

.match-height {
    align-items: stretch;
}

.preview-card {
    padding: 0 !important;
    overflow: hidden;
}

.card-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.25rem 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.header-titles {
    display: flex;
    flex-direction: column;
}

.card-section-title {
    font-size: 0.95rem;
    font-weight: 700;
    margin: 0 0 0.15rem 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-section-subtitle {
    font-size: 0.76rem;
    color: var(--text-secondary);
    margin: 0;
}

.btn-collapse-toggle {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--theme-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 4px;
}

.btn-collapse-toggle:hover {
    color: var(--text-primary);
    background: var(--border-color);
}

/* Custom Table Design */
.table-wrap {
    max-height: 480px;
    overflow: auto;
}

.table-custom {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-sans);
    font-size: 0.85rem;
}

.table-custom th {
    position: sticky;
    top: 0;
    background-color: var(--input-bg) !important;
    color: var(--text-secondary) !important;
    font-weight: 700;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--border-color);
    text-align: left;
    white-space: nowrap;
    z-index: 5;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.table-custom td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    white-space: nowrap;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    transition: var(--theme-transition);
}

.table-custom tbody tr:hover td {
    background-color: var(--accent-muted);
}

.table-custom td[contenteditable="true"] {
    cursor: text;
    position: relative;
}

.table-custom td[contenteditable="true"]:hover {
    background: rgba(245, 158, 11, 0.05);
    box-shadow: inset 0 0 0 1px var(--border-color);
}

.table-custom td[contenteditable="true"]:focus {
    outline: none;
    background-color: var(--bg-card);
    box-shadow: inset 0 0 0 1.5px var(--accent);
    color: var(--accent);
}

/* ==========================================================================
   Split Panels: Right Tabs Workspace
   ========================================================================== */

.workspace-tabs-card {
    padding: 0 !important;
    overflow: hidden;
}

/* Workspace tab list */
.custom-tabs {
    display: flex;
    background-color: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    padding: 0 0.5rem;
    list-style: none;
    margin: 0;
}

.custom-tabs .nav-item {
    margin-bottom: -1px;
}

.custom-tabs .nav-link {
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    padding: 0.9rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--theme-transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-radius: 0;
}

.custom-tabs .nav-link:hover {
    color: var(--text-primary);
}

.custom-tabs .nav-link.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.tab-pane {
    height: 100%;
}

.tab-panel-inner {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Compact headers inside tab panels */
.panel-action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.action-bar-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
}

.action-buttons-compact {
    display: flex;
    gap: 0.45rem;
}

/* Tiny utility buttons */
.btn-compact {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--theme-transition);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

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

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

/* Output Pre Code Panel */
.output-wrapper {
    background-color: #050608;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    position: relative;
    flex-grow: 1;
    min-height: 380px;
    display: flex;
    flex-direction: column;
    transition: var(--theme-transition);
}

[data-bs-theme="light"] .output-wrapper {
    background-color: #0e0f11; /* Keep output dark in light mode for code contrast */
}

#output {
    padding: 1rem;
    margin: 0;
    width: 100%;
    flex-grow: 1;
    max-height: 410px;
    overflow: auto;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.5;
    color: #cbd5e1;
    background: transparent;
}

.output-close-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    z-index: 3;
    display: none;
    align-items: center;
    gap: 0.4rem;
    padding: 0.42rem 0.7rem;
    border: 1px solid rgba(203, 213, 225, 0.18);
    border-radius: 6px;
    background: rgba(17, 20, 26, 0.92);
    color: #e5e7eb;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: var(--theme-transition);
}

.output-close-btn:hover,
.output-close-btn:focus {
    outline: none;
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: var(--shadow-focus);
}

/* Maximized Viewport overlay */
.output-wrapper.is-maximized {
    position: fixed;
    inset: 3vh 3vw;
    z-index: 2000;
    max-width: 94vw;
    max-height: 94vh;
    height: 94vh;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
}

.output-wrapper.is-maximized #output {
    max-height: calc(94vh - 40px);
    padding-top: 3.35rem;
}

.output-wrapper.is-maximized .output-close-btn {
    display: inline-flex;
}

.output-wrapper.is-maximized::before {
    content: "";
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: -1;
    pointer-events: none;
}

/* Reverse Editor Textarea */
.editor-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

.editor-textarea {
    width: 100%;
    flex-grow: 1;
    min-height: 310px;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    resize: none;
    transition: var(--theme-transition);
}

.editor-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: var(--shadow-focus);
}

.editor-action-footer {
    border-top: 1px dashed var(--border-color);
    padding-top: 0.75rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.app-footer-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 0;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    font-size: 0.76rem;
    color: var(--text-muted);
}

.footer-divider {
    color: var(--border-color);
}

.app-footer-bar a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--theme-transition);
}

.app-footer-bar a:hover {
    color: var(--accent);
}

/* ==========================================================================
   Toast Notification System
   ========================================================================== */

.toast-container {
    z-index: 3000;
}

.toast {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 0.25rem 0.5rem;
}

.toast-body {
    font-size: 0.85rem;
    font-weight: 500;
}

.toast-body i {
    font-size: 1.15rem;
}

/* Toast theme styling overrides */
.toast.text-bg-success {
    border-left: 4px solid var(--success) !important;
}

.toast.text-bg-success .toast-body i {
    color: var(--success);
}

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

.toast.text-bg-warning .toast-body i {
    color: var(--accent);
}

.toast.text-bg-danger {
    border-left: 4px solid var(--danger) !important;
}

.toast.text-bg-danger .toast-body i {
    color: var(--danger);
}

.btn-close-custom {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.75rem;
    transition: var(--theme-transition);
}

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

/* ==========================================================================
   Language Selector Specifics
   ========================================================================== */

.language-select-wrapper {
    width: 76px;
}

.language-select {
    padding: 0.35rem 1.6rem 0.35rem 0.6rem !important;
    font-size: 0.8rem !important;
    height: 38px;
    font-weight: 700;
    text-align: center;
}

.language-select-wrapper::after {
    right: 0.6rem !important;
    font-size: 0.65rem !important;
}

.custom-select-language .custom-select-button {
    height: 38px;
    min-height: 38px;
    padding: 0.35rem 0.55rem 0.35rem 0.7rem;
    font-size: 0.8rem;
    font-weight: 800;
    text-align: center;
}

.custom-select-language .custom-select-value {
    text-align: center;
}

.custom-select-language .custom-select-icon {
    font-size: 0.65rem;
}

.custom-select-language .custom-select-list {
    min-width: 76px;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 991.98px) {
    .app-container {
        padding: 1rem;
    }
    
    .toolbar-toggles-row {
        gap: 1rem;
    }
}

@media (max-width: 767.98px) {
    .drop-zone {
        min-height: 160px;
    }

    .output-wrapper.is-maximized {
        inset: 1vh 1vw;
        max-width: 98vw;
        max-height: 98vh;
        height: 98vh;
    }

    .data-tools-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .format-selector-row {
        flex-wrap: wrap;
    }
}

/* ==========================================================================
   URL Link Import
   ========================================================================== */

.drop-zone-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    gap: 0.5rem;
}

.drop-zone-wrapper .drop-zone {
    flex: 1 1 auto;
    min-height: 195px;
}

.url-import-section {
    flex-shrink: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    transition: var(--theme-transition);
}

.url-import-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    background: transparent;
    border: none;
    padding: 0.6rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--theme-transition);
    font-family: var(--font-sans);
}

.url-import-toggle:hover {
    color: var(--accent);
    background: var(--accent-muted);
}

.url-chevron {
    margin-left: auto;
    transition: transform 0.25s ease;
    font-size: 0.7rem;
}

.url-chevron.open {
    transform: rotate(180deg);
}

.url-import-bar {
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 0.85rem 0.75rem;
    border-top: 1px solid var(--border-color);
    background: var(--input-bg);
    border-radius: 0 0 10px 10px;
}

.url-import-bar.open {
    display: flex;
}

.url-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--text-primary);
    padding: 0;
}

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

.url-fetch-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    padding: 0.45rem 0.75rem;
    font-size: 0.77rem;
    font-weight: 700;
    color: #0d0900;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    transition: var(--theme-transition);
    font-family: var(--font-sans);
}

.url-fetch-btn:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 10px rgba(245, 158, 11, 0.25);
}

.url-fetch-btn.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* ==========================================================================
   Data Tools Bar (Search + Cleansers)
   ========================================================================== */

.data-tools-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--input-bg);
    min-height: 48px;
}

.search-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 7px;
    padding: 0.3rem 0.65rem;
    transition: var(--theme-transition);
}

.search-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: var(--shadow-focus);
}

.search-icon {
    color: var(--text-muted);
    font-size: 0.8rem;
    flex-shrink: 0;
}

.search-input {
    background: transparent;
    border: none;
    outline: none;
    font-size: 0.82rem;
    font-family: var(--font-sans);
    color: var(--text-primary);
    width: 100%;
}

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

.search-count {
    font-size: 0.72rem;
    font-family: var(--font-mono);
    color: var(--accent);
    white-space: nowrap;
    font-weight: 600;
    flex-shrink: 0;
}

.cleanser-tools {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    flex-shrink: 0;
}

.cleanser-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 700;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: var(--theme-transition);
}

.cleanser-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-muted);
}

.cleanser-btn.cleanser-danger:hover {
    border-color: var(--danger);
    color: var(--danger);
    background: var(--danger-muted);
}

/* ==========================================================================
   Column Type Selectors (inside <th>)
   ========================================================================== */

.th-inner {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.th-label {
    display: block;
}

.column-select-wrapper {
    width: 100%;
}

.col-type-select {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    color: var(--text-muted);
    font-size: 0.65rem;
    font-family: var(--font-mono);
    padding: 0 0.1rem;
    cursor: pointer;
    outline: none;
    appearance: none;
    width: 100%;
    transition: var(--theme-transition);
}

.col-type-select:focus,
.col-type-select:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.custom-select-column {
    z-index: 5;
}

.custom-select-column .custom-select-button {
    min-height: 24px;
    padding: 0.05rem 0.15rem;
    border: 0;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 500;
}

.custom-select-column .custom-select-button:hover,
.custom-select-column .custom-select-button:focus,
.custom-select-column.is-open .custom-select-button {
    border-color: var(--accent);
    color: var(--accent);
    background: transparent;
    box-shadow: none;
}

.custom-select-column .custom-select-icon {
    font-size: 0.58rem;
}

.custom-select-column .custom-select-list {
    min-width: 120px;
    max-height: 180px;
}

.custom-select-column .custom-select-option {
    padding: 0.4rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.68rem;
}

/* Cell validation states */
.table-custom td.cell-invalid {
    background: rgba(239, 68, 68, 0.07) !important;
    box-shadow: inset 0 0 0 1.5px var(--danger);
    color: var(--danger);
}

.table-custom td.cell-invalid:focus {
    background: rgba(239, 68, 68, 0.12) !important;
    box-shadow: inset 0 0 0 1.5px var(--danger), var(--shadow-danger);
}

/* ==========================================================================
   Format Selector Pills (JSON / YAML / XML / Markdown)
   ========================================================================== */

.format-selector-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0 0.75rem 0;
    border-bottom: 1px dashed var(--border-color);
    margin-bottom: 0.75rem;
}

.format-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    flex-shrink: 0;
}

.format-pills {
    display: flex;
    gap: 0.3rem;
}

.format-pill {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.2rem 0.65rem;
    font-size: 0.76rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--theme-transition);
}

.format-pill:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.format-pill.active {
    background: var(--accent-muted);
    border-color: var(--accent);
    color: var(--accent);
}

/* ==========================================================================
   Integration / Snippet Panel
   ========================================================================== */

.snippet-lang-row {
    display: flex;
    gap: 0.35rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.snippet-lang-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.2rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--theme-transition);
}

.snippet-lang-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.snippet-lang-btn.active {
    background: var(--info-muted);
    border-color: var(--info);
    color: var(--info);
}

.snippet-wrapper {
    min-height: 340px;
}

.snippet-wrapper pre {
    margin: 0;
    height: 100%;
}

#snippetOutput {
    display: block;
    padding: 1rem;
    min-height: 340px;
    overflow: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
    background: transparent;
    color: #cbd5e1;
}