/* GridCutter — Precision Instrument Theme (graphite + single lime signal) */
:root {
    /* Graphite surface scale */
    --bg-primary: #0c0d0f;
    --bg-secondary: #131519;
    --bg-tertiary: #191c21;
    --bg-raised: #202429;
    /* Single accent — a "live" lime used only for active / action / focus */
    --accent-primary: #cded4d;
    --accent-primary-dim: rgba(205, 237, 77, 0.13);
    /* State signals — color as evidence, not decoration */
    --accent-secondary: #ff6b6b;   /* destructive: delete */
    --accent-success: #4ade80;     /* copied */
    --accent-info: #4aa8ff;        /* drag / drop target */
    /* Ink */
    --text-primary: #e8eaed;
    --text-secondary: #9ba3ac;
    --text-muted: #626a73;
    /* Structure — hairlines over shadows */
    --border-color: #24282e;
    --border-strong: #333a42;
    --grid-line: rgba(255, 255, 255, 0.13);
    --cell-hover: rgba(205, 237, 77, 0.10);
    --cell-selected: rgba(205, 237, 77, 0.30);
    --cell-copied: rgba(74, 222, 128, 0.28);
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.55);
    --radius: 3px;
    --radius-sm: 2px;
    --transition: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', 'JetBrains Mono', 'Menlo', 'Consolas', monospace;
}

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

body {
    font-family: var(--font-ui);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    max-width: 1760px;
    margin: 0 auto;
    padding: 0 20px 18px;
    gap: 14px;
}

/* Header — slim instrument bar, left-aligned wordmark + tagline */
.app-header {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 16px 2px 12px;
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    font-family: var(--font-ui);
    font-size: 1.02rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--text-primary);
    position: relative;
    padding-left: 16px;
}

/* Lime signal mark before the wordmark — the single accent, used once */
.app-header h1::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 7px;
    height: 7px;
    background: var(--accent-primary);
    border-radius: 1px;
}

.subtitle {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.01em;
    margin: 0;
}

/* Toolbar — flush command strip, hairline-separated */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 8px 10px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.tool-group {
    display: flex;
    gap: 6px;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 8px 13px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: color var(--transition), border-color var(--transition), background var(--transition), transform var(--transition);
}

.tool-btn:hover:not(:disabled) {
    background: var(--bg-raised);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.tool-btn:active:not(:disabled) {
    transform: translateY(1px);
}

.tool-btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

.tool-btn.primary {
    background: var(--accent-primary);
    color: #0c0d0f;
    border-color: var(--accent-primary);
    font-weight: 600;
}

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

.tool-btn .icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 15px;
    height: 15px;
}

.tool-btn .icon svg {
    width: 100%;
    height: 100%;
    display: block;
}

.tool-label {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-right: 4px;
}

/* Workspace */
.workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    flex: 1;
    min-height: 0;
}

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

.panel-header {
    display: flex;
    flex-wrap: wrap;
    row-gap: 6px;
    column-gap: 10px;
    justify-content: space-between;
    align-items: center;
    padding: 9px 14px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-hint {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.01em;
    color: var(--text-muted);
    /* Drop to its own line so the button groups (incl. the 16:9/9:16 toggle)
       always fit on the top row instead of overflowing and being clipped. */
    flex-basis: 100%;
    min-width: 0;
}

/* Panel-level Grid Size Toggle */
.panel-grid-size {
    display: flex;
    gap: 1px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1px;
}

.panel-grid-size .panel-toggle-btn,
.panel-blank-aspect .panel-toggle-btn {
    padding: 4px 8px;
    font-size: 0.68rem;
    font-family: var(--font-mono);
    letter-spacing: 0;
}

/* Blank-grid cell aspect toggle (16:9 / 9:16) — matches grid-size toggle */
.panel-blank-aspect {
    display: flex;
    gap: 1px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1px;
}

.panel-blank-aspect[hidden] {
    display: none;
}

/* Panel Toggle (Source/Compare) */
.panel-toggle {
    display: flex;
    gap: 1px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1px;
    border-radius: var(--radius-sm);
}

.panel-toggle-btn {
    padding: 5px 12px;
    background: transparent;
    border: none;
    border-radius: 1px;
    color: var(--text-secondary);
    font-size: 0.76rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: color var(--transition), background var(--transition);
}

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

/* Active segment = raised grey + white text + a lime tick underline.
   Solid-lime fill is reserved for the single primary action (Export), so
   the toggles read as "selected" without competing for primary focus. */
.panel-toggle-btn.active {
    background: var(--bg-raised);
    color: var(--text-primary);
    box-shadow: inset 0 -2px 0 var(--accent-primary);
}

/* Panel Mode Content */
.panel-mode-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.panel-mode-content[hidden] {
    display: none;
}

/* Uniform datum edge — panels are identified by their toggles, not color */
.source-panel .panel-header,
.target-panel .panel-header {
    border-left: 2px solid var(--border-strong);
}

/* Canvas Container */
.canvas-container {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    min-height: 400px;
    overflow: hidden;
}

/* Empty State Placeholder - fills container */
.canvas-container::before {
    content: '';
    position: absolute;
    inset: 14px;
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-sm);
    pointer-events: none;
    transition: border-color var(--transition), background var(--transition);
    z-index: 1;
}

.canvas-container:has(canvas:not([hidden]))::before {
    display: none;
}

/* Dropzone Center Content */
.dropzone-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    pointer-events: none;
    z-index: 2;
    transition: all var(--transition);
}

.canvas-container:has(canvas:not([hidden])) .dropzone-center {
    display: none;
}

.dropzone-center .plus-icon {
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 200;
    color: var(--text-secondary);
    line-height: 1;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    transition: color var(--transition), border-color var(--transition);
}

.dropzone-center .dropzone-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.02em;
    color: var(--text-muted);
    text-align: center;
}

.canvas-container:hover .dropzone-center,
.canvas-container.drag-over .dropzone-center {
    color: var(--accent-primary);
}

.canvas-container:hover .dropzone-center .plus-icon,
.canvas-container.drag-over .dropzone-center .plus-icon {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Make empty container clickable */
.canvas-container:not(:has(canvas:not([hidden]))) {
    cursor: pointer;
}

/* Container drag-over highlight */
.canvas-container.drag-over::before {
    border-color: var(--accent-primary);
    background: var(--cell-hover);
}

/* Drop Banner - Above Grid */
.drop-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 9px 14px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: color var(--transition), background var(--transition), border-color var(--transition);
    color: var(--text-secondary);
    font-size: 0.76rem;
    font-weight: 500;
}

.drop-banner:hover {
    background: var(--bg-raised);
    color: var(--text-primary);
    border-color: var(--border-strong);
}

/* Armed to receive a drop — the one place the accent signals a live target */
.drop-banner.drag-over {
    background: var(--accent-primary-dim);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.drop-banner .drop-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 15px;
    height: 15px;
    color: var(--text-muted);
}

.drop-banner .drop-icon svg {
    width: 100%;
    height: 100%;
    display: block;
}

.drop-banner:hover .drop-icon,
.drop-banner.drag-over .drop-icon {
    color: currentColor;
}

.drop-banner.has-image {
    padding: 6px 14px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Legacy Dropzone - for empty state */
.dropzone {
    position: absolute;
    inset: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.dropzone:hover,
.dropzone.drag-over {
    border-color: var(--accent-primary);
    background: var(--cell-hover);
}

.dropzone-content {
    text-align: center;
    color: var(--text-secondary);
}

.dropzone-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 12px;
}

.dropzone-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* Canvas - general styling */
canvas {
    border-radius: var(--radius-sm);
}

/* Source/Target canvases - NO constraints so rendered size matches internal size */
/* This is critical for grid overlay alignment */
#sourceCanvas,
#targetCanvas {
    /* Dimensions set explicitly by JS - do not constrain with CSS */
    display: block;
}

/* Grid Overlay */
.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 10;
}

.grid-overlay.active {
    pointer-events: auto;
    z-index: 10;
}

.grid-cell {
    position: absolute;
    border: 1px solid var(--grid-line);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 4px;
}

.grid-cell:hover {
    background: var(--cell-hover);
    border-color: var(--accent-primary);
}

.grid-cell.selected {
    background: var(--cell-selected);
    border-color: var(--accent-primary);
    border-width: 2px;
}

.grid-cell.copied {
    background: var(--cell-copied);
    border-color: var(--accent-success);
    border-width: 2px;
}

.grid-cell.paste-target {
}

.grid-cell.drag-over {
    background: var(--accent-primary-dim);
    border-color: var(--accent-primary);
    border-width: 3px;
    border-style: dashed;
}

.grid-cell.dragging {
    cursor: grabbing;
}

/* Hide the actual cell content area during drag - show placeholder */
.grid-cell.dragging::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg-tertiary);
    border: 2px dashed var(--accent-primary);
    border-radius: var(--radius-sm);
    z-index: 1;
}

/* Target cells are draggable for rearranging */
#targetGridOverlay .grid-cell {
    cursor: grab;
}

#targetGridOverlay .grid-cell:active {
    cursor: grabbing;
}


.cell-label {
    font-family: var(--font-mono);
    font-size: 9px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    background: rgba(0, 0, 0, 0.4);
    padding: 2px 4px;
    border-radius: var(--radius-sm);
    pointer-events: none;
}

/* Expand Button on Grid Cells (Source) */
.grid-cell .expand-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition);
    z-index: 5;
}

.grid-cell:hover .expand-btn {
    opacity: 1;
}

.grid-cell .expand-btn:hover {
    background: rgba(0, 0, 0, 0.85);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: scale(1.1);
}

/* Delete Button on Grid Cells (Target) */
.grid-cell .cell-delete-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 18px;
    font-weight: bold;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition);
    z-index: 100;
    pointer-events: auto;
}

.grid-cell:hover .cell-delete-btn {
    opacity: 1;
}

.grid-cell .cell-delete-btn:hover {
    background: rgba(0, 0, 0, 0.85);
    border-color: var(--accent-secondary);
    color: var(--accent-secondary);
    transform: scale(1.1);
}

/* Pan Handle on Target Grid Cells */
.grid-cell .pan-handle {
    position: absolute;
    bottom: 4px;
    right: 4px;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    opacity: 0;
    cursor: move;
    transition: opacity 0.15s, background 0.15s;
    z-index: 6;
    pointer-events: auto;
    user-select: none;
}

.grid-cell.has-pan-handle:hover .pan-handle {
    opacity: 1;
}

.grid-cell.is-panning .pan-handle {
    opacity: 1;
    background: var(--accent-primary-dim);
    border-color: var(--accent-primary);
}

.grid-cell .pan-handle:hover {
    background: rgba(0, 0, 0, 0.85);
    border-color: var(--accent-primary);
}

/* Suppress hover UI on non-panning cells while pan is active */
#targetGridOverlay.is-panning .grid-cell:not(.is-panning):hover .pan-handle,
#targetGridOverlay.is-panning .grid-cell:not(.is-panning):hover .cell-delete-btn {
    opacity: 0 !important;
    pointer-events: none;
}

/* Status Bar — cockpit datum line, monospace */
.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 7px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.01em;
    color: var(--text-muted);
}

.status-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-right {
    color: var(--text-secondary);
}

#copiedCellStatus.has-copied {
    color: var(--accent-success);
}

/* Cell Tooltip */
.cell-tooltip {
    position: fixed;
    padding: 6px 10px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    pointer-events: none;
    z-index: 1000;
    box-shadow: var(--shadow);
}

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

    .canvas-container {
        min-height: 350px;
    }
}

@media (max-width: 600px) {
    .app-container {
        padding: 12px;
    }

    .toolbar {
        flex-direction: column;
        gap: 12px;
    }

    .tool-group {
        width: 100%;
        justify-content: center;
    }

    .panel-header {
        flex-direction: column;
        gap: 4px;
        text-align: center;
    }
}

/* Loading State */
.loading {
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Success feedback */
.success-flash {
    animation: flash-success 0.3s ease;
}

@keyframes flash-success {
    0%, 100% { box-shadow: none; }
    50% { box-shadow: 0 0 20px var(--accent-success); }
}

/* =====================
   Tab Navigation
   ===================== */
.tab-nav {
    display: flex;
    gap: 4px;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 12px 24px;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition);
}

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

.tab-btn.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

/* Tab Content (legacy) */
.tab-content {
    display: none;
    flex-direction: column;
    flex: 1;
    gap: 16px;
}

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

/* Editor Content */
.editor-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 16px;
}

/* =====================
   Compare Tab Styles
   ===================== */
.compare-layout {
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex: 1;
}

.compare-upload-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 24px;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.compare-upload-zone:hover,
.compare-upload-zone.drag-over {
    border-color: var(--accent-primary);
    background: var(--cell-hover);
}

.compare-upload-zone .drop-icon {
    font-size: 2.5rem;
}

.compare-upload-zone .drop-text {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.compare-upload-zone .drop-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.compare-upload-zone input[type="file"] {
    display: none !important;
}

.compare-upload-zone.has-images {
    padding: 12px;
    flex-direction: row;
    border-style: solid;
}

.compare-upload-zone.has-images .drop-icon {
    font-size: 1.2rem;
}

.compare-upload-zone.has-images .drop-text {
    font-size: 0.85rem;
}

.compare-upload-zone.has-images .drop-hint {
    display: none;
}

.compare-upload-zone.max-reached {
    opacity: 0.5;
    cursor: not-allowed;
    border-style: solid;
}

.compare-upload-zone.max-reached:hover {
    border-color: var(--border-color);
    background: var(--bg-secondary);
}

.compare-workspace {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 20px;
    flex: 1;
}

.compare-section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    padding: 16px;
}

.compare-section h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.compare-section h3 span {
    color: var(--accent-primary);
    font-weight: 700;
}

/* Position Selector */
.position-selector-section {
    width: 200px;
}

.position-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

.position-btn {
    aspect-ratio: 16 / 9;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.position-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

.selector-hint,
.results-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 12px;
    text-align: center;
}

/* Comparison Results Grid */
.results-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    flex: 1;
    min-height: 300px;
    cursor: default;
}

.comparison-placeholder {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    min-height: 200px;
    cursor: pointer;
    transition: all var(--transition);
}

.comparison-placeholder:hover,
.comparison-grid.drag-over .comparison-placeholder {
    border-color: var(--accent-primary);
    background: var(--cell-hover);
    color: var(--text-primary);
}

.comparison-grid.drag-over {
    background: var(--cell-hover);
    border-radius: var(--radius);
}

.comparison-cell {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition);
}

.comparison-cell:hover {
    border-color: var(--accent-primary);
    transform: scale(1.02);
}

.comparison-cell.copied {
    background: var(--cell-copied);
    border-color: var(--accent-success);
    border-width: 2px;
}

.comparison-cell.copy-flash {
    animation: comparison-flash 0.3s ease;
}

@keyframes comparison-flash {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); box-shadow: 0 0 20px var(--accent-success); }
}

.comparison-cell-label {
    position: absolute;
    bottom: 4px;
    left: 4px;
    background: rgba(0, 0, 0, 0.75);
    color: var(--text-primary);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 3px;
    pointer-events: none;
}


.comparison-cell canvas {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.comparison-cell .cell-index {
    position: absolute;
    top: 4px;
    left: 4px;
    background: rgba(0, 0, 0, 0.7);
    color: var(--text-primary);
    font-size: 0.65rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 3px;
}


/* Tool info text in toolbar */
.tool-info {
    display: flex;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 0 12px;
}

/* Responsive for Compare tab */
@media (max-width: 900px) {
    .compare-workspace {
        grid-template-columns: 1fr;
    }

    .position-selector-section {
        width: 100%;
    }

    .position-selector {
        max-width: 300px;
        margin: 0 auto;
    }

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

/* =====================
   Inline Compare (Editor Tab)
   ===================== */
.inline-compare {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 12px;
    gap: 12px;
    overflow: hidden;
}

.inline-position-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
}

.inline-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.inline-position-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr); /* Default 4x4, JS overrides dynamically */
    gap: 4px;
    flex: 1;
}

.inline-position-btn {
    padding: 4px 6px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    color: var(--text-muted);
    font-size: 0.65rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.inline-position-btn:hover {
    background: var(--cell-hover);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.inline-position-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

.inline-comparison-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr); /* Default 4x4, JS overrides dynamically */
    gap: 8px;
    align-content: start;
    overflow-y: auto;
    padding: 16px;
    flex: 1;
    min-height: 300px;
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.inline-comparison-grid:hover,
.inline-comparison-grid.drag-over {
    border-color: var(--accent-primary);
    background: var(--cell-hover);
}

.inline-comparison-grid:hover .comparison-placeholder,
.inline-comparison-grid.drag-over .comparison-placeholder {
    color: var(--accent-primary);
}

.inline-comparison-grid:hover .comparison-placeholder .drop-icon,
.inline-comparison-grid.drag-over .comparison-placeholder .drop-icon {
    color: var(--accent-primary);
}

/* Hide placeholder when grids are loaded */
.inline-comparison-grid:has(.comparison-cell) .comparison-placeholder {
    display: none;
}

.inline-comparison-grid:has(.comparison-cell) {
    border-style: solid;
    cursor: default;
}

.inline-comparison-grid .comparison-placeholder {
    grid-column: 1 / -1;
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-muted);
    pointer-events: none;
    z-index: 2;
    transition: all var(--transition);
}

.inline-comparison-grid .comparison-placeholder .drop-icon {
    font-size: 3rem;
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1;
}

.inline-comparison-grid .comparison-placeholder p {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
    margin: 0;
}

.inline-comparison-grid .comparison-cell {
    aspect-ratio: 16 / 9;
}

.inline-comparison-grid .comparison-cell-label {
    font-size: 0.6rem;
    padding: 2px 6px;
}

/* Expand Button on Comparison Cells */
.comparison-cell .expand-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition);
    z-index: 5;
}

.comparison-cell:hover .expand-btn {
    opacity: 1;
}

.comparison-cell .expand-btn:hover {
    background: rgba(0, 0, 0, 0.85);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: scale(1.1);
}

/* Full Resolution Modal */
.fullres-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fullres-modal[hidden] {
    display: none;
}

.fullres-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    cursor: pointer;
}

.fullres-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.fullres-close {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    z-index: 10;
}

.fullres-close:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
    color: white;
}

.fullres-header {
    padding: 12px 50px 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.fullres-header span {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.fullres-image-container {
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
}

.fullres-image-container canvas {
    max-width: 100%;
    max-height: calc(90vh - 80px);
    object-fit: contain;
    border-radius: var(--radius-sm);
}

/* Responsive inline compare */
@media (max-width: 1200px) {
    .inline-position-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

/* =====================
   Accessibility
   ===================== */
/* Keyboard focus — lime is the system's focus signal (see --accent-primary) */
button:focus-visible,
[tabindex]:focus-visible,
input:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}