:root {
    --checker-a: #3a3a45;
    --checker-b: #2a2a32;
    --stage-solid: #7a7a82;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: #1e1e24;
    color: #f5f5f7;
    padding: 2rem;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.logo-img {
    max-height: 8.0rem;
    width: auto;
    vertical-align: middle;
}

.logo-text {
    display: none;
}

.subtitle {
    color: #a1a1a6;
    margin-bottom: 2rem;
}

.controls {
    background-color: #2a2a32;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.9rem;
    color: #ccd;
}

.file-label {
    background-color: #0071e3;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    display: inline-block;
}

#imageUpload {
    display: none;
}

.secondary-btn {
    background-color: #3a3a45;
    color: #f5f5f7;
    border: 1px solid #4a4a55;
    padding: 0.7rem 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
}

.secondary-btn:hover {
    background-color: #45454f;
}

.bg-group {
    min-width: 200px;
}

.bg-swatches {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.bg-swatch {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    border: 2px solid #4a4a55;
    cursor: pointer;
    padding: 0;
    background-color: var(--sw-solid, transparent);
}

.checker-swatch {
    background-image:
        linear-gradient(45deg, var(--sw-a) 25%, transparent 25%),
        linear-gradient(-45deg, var(--sw-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--sw-a) 75%),
        linear-gradient(-45deg, transparent 75%, var(--sw-a) 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0;
    background-color: var(--sw-b);
}

.bg-swatch.active {
    border-color: #0071e3;
}

#customBgColor {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    border: 2px solid #4a4a55;
    padding: 0;
    background: none;
    cursor: pointer;
}

.trim-export-toggle {
    font-size: 0.82rem;
    margin-top: 0.4rem;
    white-space: nowrap;
}

.onion-toggle {
    font-size: 0.85rem;
    white-space: nowrap;
}

.lightbox-editing-label {
    font-size: 0.78rem;
    color: #86868b;
    background-color: #1e1e24;
    border: 1px solid #3a3a45;
    border-radius: 999px;
    padding: 0.25rem 0.7rem;
    white-space: nowrap;
}

.lightbox-editing-label.override-active {
    color: #ffb020;
    border-color: #ffb020;
}

.lightbox-override-toggle {
    font-size: 0.85rem;
    white-space: nowrap;
    font-weight: 600;
    border-right: 1px solid #3a3a45;
    padding-right: 1.25rem;
}

.override-badge {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 600;
    color: #ffb020;
    border: 1px solid #ffb020;
    border-radius: 999px;
    padding: 0.05rem 0.5rem;
    margin-top: -0.3rem;
}

.key-color-group {
    flex-grow: 1;
    min-width: 220px;
}

.key-color-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.eyedropper-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: #3a3a45;
    color: #f5f5f7;
    border: 1px solid #4a4a55;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
}

.eyedropper-btn.active {
    background-color: #0071e3;
    border-color: #0071e3;
}

.key-color-swatch {
    width: 34px;
    height: 34px;
    border-radius: 6px;
    border: 2px solid #555;
    background-color: #22c55e;
    flex-shrink: 0;
}

.mode-toggle {
    display: inline-flex;
    border: 1px solid #4a4a55;
    border-radius: 8px;
    overflow: hidden;
    background-color: #1e1e24;
}

.mode-btn {
    background: none;
    border: none;
    color: #a1a1a6;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
}

.mode-btn.active {
    background-color: #0071e3;
    color: #fff;
}

.mode-btn + .mode-btn {
    border-left: 1px solid #4a4a55;
}

/* Dim controls that only apply in Green Screen mode */
label:has(input[type="checkbox"]:disabled),
.slider-group:has(input[type="range"]:disabled) {
    opacity: 0.5;
}

input[type="range"]:disabled {
    cursor: not-allowed;
}

.sliders {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex: 1 1 220px;
}

.slider-group label {
    font-size: 0.9rem;
    color: #ccd;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.hint {
    font-size: 0.76rem;
    color: #86868b;
    font-weight: 400;
}

input[type="range"] {
    width: 100%;
    accent-color: #0071e3;
}

.checkbox-group {
    justify-content: center;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    flex-wrap: wrap;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.toggle-track {
    width: 38px;
    height: 22px;
    background-color: #4a4a55;
    border-radius: 999px;
    position: relative;
    transition: background-color 0.15s ease;
    flex-shrink: 0;
}

.toggle-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background-color: #f5f5f7;
    border-radius: 50%;
    transition: transform 0.15s ease;
}

.toggle-label input:checked + .toggle-track {
    background-color: #0071e3;
}

.toggle-label input:checked + .toggle-track .toggle-thumb {
    transform: translateX(16px);
}

.preview-panel {
    background-color: #2a2a32;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.preview-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.preview-panel-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.fps-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #ccd;
    font-size: 0.85rem;
}

.fps-control input[type="range"] {
    width: 140px;
}

.preview-stage {
    width: 220px;
    aspect-ratio: 1;
    margin: 0 auto;
    background-image:
        linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-color: var(--checker-b);
    border-radius: 8px;
    border: 1px solid #444;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#spritePreviewCanvas {
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
}

/* Sprite Sheet */
.sheet-panel {
    background-color: #2a2a32;
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.sheet-settings {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.sheet-settings label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: #ccd;
}

.sheet-settings input[type="number"] {
    width: 60px;
    background-color: #1e1e24;
    border: 1px solid #4a4a55;
    border-radius: 6px;
    color: #f5f5f7;
    padding: 0.35rem 0.5rem;
    font-size: 0.9rem;
}

.sheet-trim-toggle {
    font-size: 0.85rem;
}

.sheet-hint {
    color: #86868b;
    font-size: 0.8rem;
    margin: 0.75rem 0 0.5rem;
}

.frame-order-strip {
    display: flex;
    gap: 0.6rem;
    overflow-x: auto;
    padding: 0.75rem 0.25rem;
    margin-bottom: 1rem;
}

.frame-thumb {
    flex-shrink: 0;
    width: 56px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    cursor: grab;
    padding: 0.3rem;
    border-radius: 8px;
    border: 1px solid transparent;
    background-color: #1e1e24;
}

.frame-thumb canvas {
    width: 48px;
    height: 48px;
    background-image:
        linear-gradient(45deg, #3a3a45 25%, transparent 25%),
        linear-gradient(-45deg, #3a3a45 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #3a3a45 75%),
        linear-gradient(-45deg, transparent 75%, #3a3a45 75%);
    background-size: 12px 12px;
    background-position: 0 0, 0 6px, 6px -6px, -6px 0;
    border-radius: 4px;
}

.frame-thumb span {
    font-size: 0.7rem;
    color: #86868b;
}

.frame-thumb.dragging {
    opacity: 0.4;
    border-color: #0071e3;
}

.sheet-stage {
    width: 100%;
    background-image:
        linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-color: var(--checker-b);
    border-radius: 8px;
    border: 1px solid #444;
    display: flex;
    justify-content: center;
    padding: 1rem;
}

/* Solid preview background mode overrides all four checkerboard stages */
body.solid-preview-bg .canvas-container,
body.solid-preview-bg .preview-stage,
body.solid-preview-bg .lightbox-stage,
body.solid-preview-bg .sheet-stage {
    background-image: none;
    background-color: var(--stage-solid);
}

#sheetCanvas {
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
}

.sheet-export-row {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.sprite-card {
    background-color: #2a2a32;
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.canvas-container {
    width: 100%;
    aspect-ratio: 1;
    background-image:
        linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-color: var(--checker-b);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    border: 1px solid #444;
    cursor: zoom-in;
    position: relative;
}

.canvas-container.eyedrop-mode {
    cursor: crosshair;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.filename {
    font-size: 0.85rem;
    color: #a1a1a6;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    text-align: center;
}

.card-row {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.download-btn {
    background-color: #34c759;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    flex: 1;
    text-align: center;
    text-decoration: none;
    font-size: 0.85rem;
}

.download-btn:hover {
    background-color: #28a745;
}

.original-toggle-btn {
    background-color: #3a3a45;
    color: #f5f5f7;
    border: 1px solid #4a4a55;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}

.original-toggle-btn.active {
    background-color: #0071e3;
    border-color: #0071e3;
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    background-color: rgba(10, 10, 13, 0.92);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.lightbox.hidden {
    display: none;
}

.lightbox-toolbar {
    width: 100%;
    max-width: 900px;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.lightbox-name {
    flex-grow: 1;
    font-weight: 500;
    color: #f5f5f7;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lightbox-zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: #ccd;
    font-size: 0.85rem;
}

.lightbox-zoom-controls input[type="range"] {
    width: 160px;
}

.lightbox-key-controls {
    width: 100%;
    max-width: 900px;
    background-color: #2a2a32;
    border: 1px solid #3a3a45;
    border-radius: 10px;
    padding: 0.9rem 1.2rem;
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.lightbox-key-controls .slider-group {
    flex: 1 1 200px;
}

.lightbox-key-controls label {
    font-size: 0.82rem;
    color: #ccd;
}

.lightbox-spill-toggle {
    font-size: 0.85rem;
    white-space: nowrap;
}

.lightbox-stage {
    width: 100%;
    max-width: 900px;
    flex-grow: 1;
    max-height: 65vh;
    aspect-ratio: 1;
    background-image:
        linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
    background-size: 24px 24px;
    background-position: 0 0, 0 12px, 12px -12px, -12px 0;
    background-color: var(--checker-b);
    border-radius: 12px;
    border: 1px solid #444;
    overflow: hidden;
    position: relative;
    cursor: grab;
}

.lightbox-stage.dragging {
    cursor: grabbing;
}

#lightboxCanvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform-origin: center center;
    image-rendering: pixelated;
}

.lightbox-hint {
    color: #86868b;
    font-size: 0.8rem;
    margin-top: 0.75rem;
}

/* Drag-and-drop upload overlay */
body.drag-over::after {
    content: "Drop frames to upload";
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 113, 227, 0.2);
    border: 3px dashed #0071e3;
    font-size: 1.4rem;
    font-weight: 600;
    color: #f5f5f7;
    pointer-events: none;
}