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

:root {
    --bg: #060608;
    --bg2: #0d0d12;
    --bg3: #14141c;
    --accent: #00ffc8;
    --accent2: #ff00ff;
    --text: #c8d0dc;
    --text-dim: #5a6070;
    --glow: 0 0 8px rgba(0,255,200,0.4), 0 0 20px rgba(0,255,200,0.15);
    --glow2: 0 0 8px rgba(255,0,255,0.4), 0 0 20px rgba(255,0,255,0.15);
    --font-mono: 'Fira Code', 'IBM Plex Mono', 'Courier New', monospace;
}

html, body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-mono);
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.04) 2px,
        rgba(0,0,0,0.04) 4px
    );
}

#app {
    max-width: 1400px;
    margin: 0 auto;
    padding: 12px;
}

header {
    text-align: center;
    padding: 20px 10px 8px;
}

header h1 {
    font-size: clamp(1.6rem, 5vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--accent);
    text-shadow: var(--glow);
}

header .berry {
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

header .subtitle {
    font-size: 0.8rem;
    color: var(--text-dim);
    font-weight: 300;
    margin-top: 4px;
    letter-spacing: 0.5px;
}

#palette-bar {
    display: flex;
    justify-content: center;
    gap: 6px;
    padding: 10px 0;
    flex-wrap: wrap;
}

.palette-swatch {
    width: 32px;
    height: 32px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    border: 1px solid rgba(255,255,255,0.1);
    cursor: default;
    transition: transform 0.15s;
}

.palette-swatch:hover {
    transform: scale(1.2);
}

.palette-swatch span {
    text-shadow: 0 0 4px rgba(0,0,0,0.8);
    color: #fff;
}

.palette-swatch:last-child span {
    color: #000;
    text-shadow: none;
}

#controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 12px;
    background: var(--bg2);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 8px;
    margin-bottom: 12px;
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1 1 140px;
    min-width: 120px;
}

.control-group label {
    font-size: 0.65rem;
    text-transform: uppercase;
    color: var(--text-dim);
    letter-spacing: 1px;
    font-weight: 500;
}

select, button {
    font-family: var(--font-mono);
    background: var(--bg3);
    color: var(--text);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 4px;
    padding: 6px 8px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
}

select:hover, button:hover {
    border-color: var(--accent);
    box-shadow: var(--glow);
}

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

button#download-btn {
    background: rgba(0,255,200,0.08);
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 600;
    white-space: nowrap;
}

button#download-btn:hover {
    background: rgba(0,255,200,0.18);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--bg3);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 6px rgba(0,255,200,0.5);
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

#upload-zone {
    position: relative;
    border: 2px dashed rgba(255,255,255,0.1);
    border-radius: 6px;
    padding: 8px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    font-size: 0.7rem;
    color: var(--text-dim);
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

#upload-zone:hover, #upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(0,255,200,0.04);
}

#upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

#thumb-preview {
    display: none;
    width: 32px;
    height: 32px;
    border-radius: 3px;
}

#thumb-preview.visible {
    display: block;
}

#canvas-container {
    display: flex;
    gap: 2px;
    background: var(--bg2);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 8px;
    overflow: hidden;
    min-height: 300px;
}

#original-panel, #output-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px;
    overflow: auto;
    position: relative;
}

.panel-label {
    font-size: 0.6rem;
    text-transform: uppercase;
    color: var(--text-dim);
    letter-spacing: 2px;
    margin-bottom: 6px;
    font-weight: 500;
}

#divider {
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--accent), transparent);
    flex-shrink: 0;
}

#original-canvas, #output-canvas {
    max-width: 100%;
    image-rendering: pixelated;
    border-radius: 4px;
}

#output-canvas {
    cursor: crosshair;
}

#tooltip {
    position: fixed;
    background: rgba(10,10,15,0.95);
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    pointer-events: none;
    display: none;
    z-index: 1000;
    white-space: nowrap;
    box-shadow: var(--glow);
}

footer {
    text-align: center;
    padding: 20px 10px;
    font-size: 0.7rem;
    color: var(--text-dim);
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

footer a {
    color: var(--accent2);
    text-decoration: none;
    text-shadow: var(--glow2);
    transition: color 0.2s;
}

footer a:hover {
    color: #ff66ff;
}

@media (max-width: 700px) {
    #canvas-container {
        flex-direction: column;
    }
    #divider {
        width: 100%;
        height: 1px;
    }
    #controls {
        gap: 8px;
    }
    .control-group {
        flex: 1 1 100%;
    }
}