:root {
    --s2g-bg-main: #0b0c10;
    --s2g-bg-panel: #15161e;
    --s2g-bg-panel-hover: #1e202b;
    --s2g-border: #282b3a;
    --s2g-border-hover: #3d425b;
    --s2g-text-primary: #f3f4f6;
    --s2g-text-secondary: #9ca3af;
    --s2g-primary: #3b82f6;
    --s2g-primary-hover: #2563eb;
    --s2g-success: #10b981;
    --s2g-success-hover: #059669;
    --s2g-danger: #ef4444;
    --s2g-danger-hover: #dc2626;
    --s2g-accent: #f59e0b;
}

.s2g-app {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    background-color: var(--s2g-bg-main);
    color: var(--s2g-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    box-sizing: border-box;
    overflow: hidden;
}

.s2g-app * {
    box-sizing: border-box;
}

/* Header styling */
.s2g-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background-color: var(--s2g-bg-panel);
    border-bottom: 1px solid var(--s2g-border);
    height: 60px;
    z-index: 10;
}

.s2g-title-row h1 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.s2g-kicker {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--s2g-primary);
    font-weight: 700;
    display: block;
    margin-bottom: 2px;
}

.s2g-status {
    font-size: 0.85rem;
    color: var(--s2g-text-secondary);
    background-color: rgba(255, 255, 255, 0.03);
    padding: 6px 14px;
    border-radius: 99px;
    border: 1px solid var(--s2g-border);
    max-width: 450px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.s2g-status[data-tone="error"] {
    color: var(--s2g-danger);
    background-color: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
}

.s2g-status[data-tone="success"] {
    color: var(--s2g-success);
    background-color: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
}

/* Layout framework */
.s2g-main-layout {
    display: flex;
    flex: 1;
    min-height: 0;
    width: 100%;
}

/* Sidebar styling */
.s2g-sidebar {
    width: 330px;
    background-color: var(--s2g-bg-panel);
    border-right: 1px solid var(--s2g-border);
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.s2g-card {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--s2g-border);
    border-radius: 10px;
    padding: 16px;
}

.s2g-card h3 {
    margin: 0 0 12px 0;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--s2g-text-secondary);
    border-bottom: 1px solid var(--s2g-border);
    padding-bottom: 8px;
}

/* Drag-and-drop zone */
.s2g-drop-zone {
    border: 2px dashed var(--s2g-border);
    border-radius: 8px;
    padding: 20px 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    background-color: rgba(0, 0, 0, 0.1);
}

.s2g-drop-zone:hover,
.s2g-drop-zone.dragover {
    border-color: var(--s2g-primary);
    background-color: rgba(59, 130, 246, 0.05);
}

.s2g-drop-zone input[type="file"] {
    display: none;
}

.s2g-upload-icon {
    font-size: 2rem;
    color: var(--s2g-text-secondary);
}

.s2g-upload-text {
    font-size: 0.8rem;
    color: var(--s2g-text-secondary);
    line-height: 1.4;
}

.s2g-meta-row {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    font-size: 0.75rem;
    color: var(--s2g-text-secondary);
}

/* Input styles */
.s2g-input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.s2g-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.s2g-field label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--s2g-text-secondary);
}

.s2g-field input[type="number"] {
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--s2g-border);
    border-radius: 6px;
    color: var(--s2g-text-primary);
    padding: 8px 8px;
    font-size: 0.85rem;
    width: 100%;
    -moz-appearance: textfield; /* Firefox */
}

/* Hide spin-buttons for Chrome, Safari, Edge, Opera */
.s2g-field input[type="number"]::-webkit-outer-spin-button,
.s2g-field input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.s2g-field input[type="number"]:focus {
    outline: none;
    border-color: var(--s2g-primary);
}

/* Checkbox design */
.s2g-checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
}

.s2g-checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    cursor: pointer;
    user-select: none;
}

.s2g-checkbox-label input[type="checkbox"] {
    accent-color: var(--s2g-primary);
    width: 15px;
    height: 15px;
    cursor: pointer;
}

/* Tool Selector Button groups */
.s2g-tool-selector {
    display: flex;
    border: 1px solid var(--s2g-border);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 12px;
}

.s2g-tool-btn {
    flex: 1;
    background-color: transparent;
    border: 0;
    color: var(--s2g-text-secondary);
    padding: 8px 4px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    transition: all 0.15s ease;
}

.s2g-tool-btn:not(:last-child) {
    border-right: 1px solid var(--s2g-border);
}

.s2g-tool-btn:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--s2g-text-primary);
}

.s2g-tool-btn.active {
    background-color: var(--s2g-primary);
    color: white;
}

.s2g-tool-btn .s2g-icon {
    font-size: 1.1rem;
}

/* Sliders */
.s2g-slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--s2g-text-secondary);
}

.s2g-brush-controls, .s2g-wand-controls {
    margin-top: 12px;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--s2g-primary);
    background: var(--s2g-border);
    height: 6px;
    border-radius: 99px;
    outline: none;
    cursor: pointer;
    margin-top: 4px;
}

/* Button UI */
.s2g-btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 6px;
    border: 0;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
    width: 100%;
    text-align: center;
}

.s2g-btn-primary {
    background-color: var(--s2g-primary);
    color: white;
}
.s2g-btn-primary:hover:not(:disabled) {
    background-color: var(--s2g-primary-hover);
}

.s2g-btn-secondary {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--s2g-text-primary);
    border: 1px solid var(--s2g-border);
}
.s2g-btn-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--s2g-border-hover);
}

.s2g-btn-success {
    background-color: var(--s2g-success);
    color: white;
}
.s2g-btn-success:hover {
    background-color: var(--s2g-success-hover);
}

.s2g-danger {
    color: var(--s2g-danger);
    border-color: rgba(239, 68, 68, 0.2);
}
.s2g-danger:hover:not(:disabled) {
    background-color: rgba(239, 68, 68, 0.1);
    color: white;
}

.s2g-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.s2g-edit-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    margin-top: 14px;
}

.s2g-edit-actions .s2g-btn {
    padding: 8px 12px;
    font-size: 0.8rem;
}

.s2g-export-card .s2g-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Center Workspace Area */
.s2g-workspace {
    flex: 1;
    background-color: var(--s2g-bg-main);
    display: flex;
    flex-direction: column;
    position: relative;
    padding: 24px;
    min-height: 0;
}

.s2g-canvas-container {
    flex: 1;
    position: relative;
    border: 1px dashed var(--s2g-border);
    border-radius: 12px;
    overflow: hidden !important;
    background-color: #121318;
}

/* Workspace Welcome state */
.s2g-workspace-welcome {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    z-index: 2;
    background-color: #121318;
    padding: 20px;
}

.s2g-welcome-content {
    max-width: 400px;
}

.s2g-welcome-art {
    font-size: 4rem;
    margin-bottom: 16px;
    color: var(--s2g-border-hover);
}

.s2g-welcome-content h2 {
    margin: 0 0 8px 0;
    font-size: 1.3rem;
}

.s2g-welcome-content p {
    color: var(--s2g-text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}

#s2g-workspace-canvas {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: 0 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    background-color: transparent;
    user-select: none;
    -webkit-user-drag: none;
}

.s2g-crop-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    font-size: 0.8rem;
    color: var(--s2g-text-secondary);
    gap: 20px;
    flex-wrap: wrap;
}

.s2g-zoom-control {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--s2g-bg-panel);
    border: 1px solid var(--s2g-border);
    border-radius: 6px;
    padding: 4px 10px;
}

#s2g-zoom-slider {
    width: 100px;
    margin: 0;
}

#s2g-zoom-val {
    min-width: 40px;
    text-align: right;
    font-weight: 600;
}

/* Right side preview panel */
.s2g-preview-sidebar {
    width: 280px;
    background-color: var(--s2g-bg-panel);
    border-left: 1px solid var(--s2g-border);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow-y: auto;
}

/* Viewport frame playback */
.s2g-preview-viewport, .s2g-render-viewport {
    background-color: #0b0c10;
    border: 1px solid var(--s2g-border);
    border-radius: 8px;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 180px;
    max-height: 240px;
    overflow: hidden;
    position: relative;
    /* Checkerboard grid background */
    background-image: linear-gradient(45deg, #181920 25%, transparent 25%),
                      linear-gradient(-45deg, #181920 25%, transparent 25%),
                      linear-gradient(45deg, transparent 75%, #181920 75%),
                      linear-gradient(-45deg, transparent 75%, #181920 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

#s2g-preview-canvas, #s2g-render-preview-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.s2g-help-text {
    font-size: 0.75rem;
    color: var(--s2g-text-secondary);
    margin: 8px 0 0 0;
    line-height: 1.4;
    text-align: center;
}

/* Responsive breakpoint styling */
@media (max-width: 1024px) {
    .s2g-app {
        height: auto;
        overflow-y: auto;
    }

    .s2g-header {
        height: auto;
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        padding: 12px 16px;
    }

    .s2g-main-layout {
        flex-direction: column;
        height: auto;
        min-height: initial;
    }

    .s2g-sidebar {
        width: 100%;
        border-right: 0;
        border-bottom: 1px solid var(--s2g-border);
        overflow-y: visible;
    }

    .s2g-workspace {
        height: 50vh;
        min-height: 380px;
        padding: 16px;
    }

    .s2g-preview-sidebar {
        width: 100%;
        border-left: 0;
        border-top: 1px solid var(--s2g-border);
        overflow-y: visible;
    }
}