:root {
    --bg-dark: #0a0a0f;
    --bg-panel: #12121a;
    --bg-elevated: #1a1a24;
    --border: #2a2a3a;
    --text: #e0e0e8;
    --text-dim: #8888a0;
    --accent: #00ff88;
    --accent-dim: #00cc6a;
    --accent-glow: rgba(0, 255, 136, 0.3);
    --danger: #ff4466;
    --warning: #ffaa00;
}

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

body {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-dark);
    color: var(--text);
    min-height: 100vh;
    overflow: hidden;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    gap: 1rem;
}

.logo {
    font-family: 'Press Start 2P', cursive;
    font-size: 0.9rem;
    color: var(--text);
    letter-spacing: 2px;
}

.logo span {
    color: var(--accent);
    text-shadow: 0 0 20px var(--accent-glow);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.size-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-dim);
}

.size-control input {
    width: 65px;
    padding: 0.4rem 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    font-family: inherit;
    font-size: 0.8rem;
    text-align: center;
}

.size-control input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.btn-primary:hover {
    background: var(--accent-dim);
    box-shadow: 0 0 20px var(--accent-glow);
}

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

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
}

.btn-danger:hover {
    background: var(--danger);
    color: var(--bg-dark);
}

/* Workspace */
.workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Toolbar */
.toolbar {
    width: 200px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
}

.tool-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.tool-btn {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-dim);
    cursor: pointer;
    transition: all 0.15s ease;
    padding: 0.75rem;
}

.tool-btn svg {
    width: 20px;
    height: 20px;
}

.tool-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.tool-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg-dark);
    box-shadow: 0 0 15px var(--accent-glow);
}

/* Color Section */
.color-section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.current-colors {
    display: flex;
    gap: 0.5rem;
}

.color-preview {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    border: 2px solid var(--border);
    cursor: pointer;
    transition: border-color 0.15s ease;
    background-image: 
        linear-gradient(45deg, #333 25%, transparent 25%),
        linear-gradient(-45deg, #333 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #333 75%),
        linear-gradient(-45deg, transparent 75%, #333 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
}

.color-preview:hover {
    border-color: var(--accent);
}

#foreground-preview {
    background-color: #00ff88;
    background-image: none;
}

#background-preview {
    background-color: transparent;
}

#color-picker {
    width: 100%;
    height: 36px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
}

#color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

#color-picker::-webkit-color-swatch {
    border: 1px solid var(--border);
    border-radius: 6px;
}

.palette {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 3px;
}

.palette-color {
    aspect-ratio: 1;
    border-radius: 3px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.1s ease;
}

.palette-color:hover {
    transform: scale(1.15);
    border-color: var(--text);
    z-index: 1;
}

/* Zoom Section */
.zoom-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.zoom-section label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
}

.zoom-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.zoom-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.15s ease;
}

.zoom-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

#zoom-level {
    font-size: 0.8rem;
    color: var(--accent);
    min-width: 50px;
    text-align: center;
}

#zoom-slider {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    background: var(--bg-elevated);
    border-radius: 2px;
    cursor: pointer;
}

#zoom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Options */
.options-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-dim);
}

.checkbox-label:hover {
    color: var(--text);
}

.checkbox-label input {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.preview-section label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
}

.thumbnail-container {
    background-image: 
        linear-gradient(45deg, #222 25%, transparent 25%),
        linear-gradient(-45deg, #222 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #222 75%),
        linear-gradient(-45deg, transparent 75%, #222 75%);
    background-size: 8px 8px;
    background-position: 0 0, 0 4px, 4px -4px, -4px 0px;
    background-color: #2a2a2a;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    max-height: 150px;
    overflow: hidden;
}

#thumbnail-canvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    max-width: 100%;
    max-height: 134px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

/* Canvas Area (contains canvas + preview panel) */
.canvas-area {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Preview Panel (right side) */
.preview-panel {
    width: 160px;
    background: var(--bg-panel);
    border-left: 1px solid var(--border);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

/* Canvas Container */
.canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: 
        radial-gradient(ellipse at center, #1a1a2e 0%, var(--bg-dark) 70%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 50px,
            rgba(0, 255, 136, 0.02) 50px,
            rgba(0, 255, 136, 0.02) 51px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 50px,
            rgba(0, 255, 136, 0.02) 50px,
            rgba(0, 255, 136, 0.02) 51px
        );
    overflow: auto;
    padding: 2rem;
}

.canvas-wrapper {
    position: relative;
    box-shadow: 
        0 0 0 1px var(--border),
        0 0 60px rgba(0, 0, 0, 0.5),
        0 0 100px rgba(0, 255, 136, 0.1);
    background-image: 
        linear-gradient(45deg, #222 25%, transparent 25%),
        linear-gradient(-45deg, #222 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #222 75%),
        linear-gradient(-45deg, transparent 75%, #222 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    background-color: #2a2a2a;
}

.canvas-wrapper canvas {
    position: absolute;
    top: 0;
    left: 0;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

#pixel-canvas {
    z-index: 1;
}

#grid-canvas {
    z-index: 2;
    pointer-events: none;
}

#preview-canvas {
    z-index: 3;
    pointer-events: none;
    opacity: 0.6;
}

/* Statusbar */
.statusbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.4rem 1.5rem;
    background: var(--bg-panel);
    border-top: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* Animations */
@keyframes glow {
    0%, 100% { box-shadow: 0 0 15px var(--accent-glow); }
    50% { box-shadow: 0 0 25px var(--accent-glow), 0 0 35px var(--accent-glow); }
}

.tool-btn.active {
    animation: glow 2s ease-in-out infinite;
}

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

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

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

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

/* Drag and Drop */
.canvas-container.drag-over {
    background: 
        radial-gradient(ellipse at center, rgba(0, 255, 136, 0.15) 0%, var(--bg-dark) 70%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 50px,
            rgba(0, 255, 136, 0.05) 50px,
            rgba(0, 255, 136, 0.05) 51px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 50px,
            rgba(0, 255, 136, 0.05) 50px,
            rgba(0, 255, 136, 0.05) 51px
        );
}

.canvas-container.drag-over::after {
    content: 'Drop image here';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Press Start 2P', cursive;
    font-size: 1rem;
    color: var(--accent);
    text-shadow: 0 0 30px var(--accent-glow);
    pointer-events: none;
    animation: pulse 1s ease-in-out infinite;
    z-index: 100;
}

.canvas-container.drag-over .canvas-wrapper {
    opacity: 0.3;
    transition: opacity 0.2s ease;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.7; transform: translate(-50%, -50%) scale(1.05); }
}