:root {
  --bg: #060608;
  --bg-panel: #0d0d12;
  --bg-card: #12121a;
  --border: #1a1a2e;
  --text: #c8c8d4;
  --text-dim: #6a6a7e;
  --accent: #00ff9f;
  --accent2: #ff2d7b;
  --accent-glow: rgba(0, 255, 159, 0.15);
  --font-display: 'VT323', monospace;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

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

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  min-height: 100vh;
  overflow-x: hidden;
}

#scanlines {
  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, 0.08) 2px,
    rgba(0, 0, 0, 0.08) 4px
  );
}

/* HEADER */
#header {
  text-align: center;
  padding: 32px 16px 16px;
}

.title {
  font-family: var(--font-display);
  font-size: clamp(60px, 12vw, 120px);
  letter-spacing: 12px;
  color: var(--accent);
  text-shadow: 
    0 0 20px var(--accent),
    0 0 60px rgba(0, 255, 159, 0.3),
    4px 4px 0 var(--accent2);
  line-height: 1;
  margin-bottom: 4px;
  animation: flicker 4s infinite alternate;
}

@keyframes flicker {
  0%, 95%, 100% { opacity: 1; }
  96% { opacity: 0.85; }
  97% { opacity: 1; }
  98% { opacity: 0.9; }
}

.subtitle {
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(12px, 2vw, 16px);
  color: var(--text-dim);
  letter-spacing: 2px;
}

.accent {
  color: var(--accent);
}

/* UPLOAD ZONE */
#upload-zone {
  max-width: 600px;
  margin: 24px auto;
  padding: 48px 24px;
  border: 2px dashed var(--border);
  border-radius: 4px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  background: var(--bg-panel);
  position: relative;
}

#upload-zone:hover, #upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(0, 255, 159, 0.03);
  box-shadow: 0 0 30px var(--accent-glow);
}

#upload-zone.dragover {
  transform: scale(1.01);
}

.upload-icon {
  color: var(--accent);
  margin-bottom: 16px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.upload-text {
  font-size: 16px;
  margin-bottom: 8px;
}

.upload-hint {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 16px;
}

/* BUTTONS */
.btn {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
  border-radius: 2px;
  white-space: nowrap;
}

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

.btn-small {
  font-size: 11px;
  padding: 6px 12px;
}

.btn-toggle {
  background: transparent;
}

.btn-toggle.active {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 600;
}

.btn-accent {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 600;
}

.btn-accent:hover {
  background: #00cc7f;
  color: var(--bg);
}

.btn-danger {
  border-color: var(--accent2);
  color: var(--accent2);
}

.btn-danger:hover {
  background: var(--accent2);
  color: var(--bg);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

/* WORKSPACE */
#workspace {
  display: flex;
  gap: 16px;
  padding: 0 16px 24px;
  max-width: 1400px;
  margin: 0 auto;
}

#controls-panel {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 16px;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--accent);
  letter-spacing: 2px;
}

.control-label span {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* SLIDERS */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border: 2px solid var(--bg);
  border-radius: 2px;
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
}

.slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border: 2px solid var(--bg);
  border-radius: 2px;
  cursor: pointer;
}

/* CUSTOM PALETTE */
#custom-palette {
  padding: 8px 0;
}

#color-pickers {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

#color-pickers input[type="color"] {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  background: none;
  cursor: pointer;
  padding: 0;
  border-radius: 2px;
}

#palette-preview {
  display: flex;
  gap: 3px;
  margin-top: 4px;
}

#palette-preview .swatch {
  width: 24px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 2px;
}

/* PREVIEW AREA */
#preview-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

#view-toggle {
  display: flex;
  gap: 4px;
  align-items: center;
}

#view-toggle .hint {
  font-size: 11px;
  color: var(--text-dim);
  margin-left: auto;
}

#canvas-container {
  flex: 1;
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  min-height: 400px;
  cursor: grab;
  box-shadow: 
    inset 0 0 60px rgba(0, 255, 159, 0.03),
    0 0 30px rgba(0, 0, 0, 0.5);
}

#canvas-container:active {
  cursor: grabbing;
}

#canvas-container canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  transform-origin: center center;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

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

#canvas-dithered {
  z-index: 2;
}

#split-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
  z-index: 10;
  pointer-events: none;
  box-shadow: 0 0 10px var(--accent);
}

#split-line::before {
  content: '◄ ►';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--accent);
  color: var(--bg);
  font-size: 10px;
  padding: 4px 6px;
  border-radius: 2px;
  white-space: nowrap;
  font-family: var(--font-mono);
}

#zoom-hint {
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
}

.export-group .btn {
  width: 100%;
  text-align: center;
}

.export-group {
  gap: 6px;
}

/* BAYER GROUP */
#bayer-group {
  display: none;
}

#bayer-group.visible {
  display: flex;
}

/* FOOTER */
#footer {
  text-align: center;
  padding: 24px 16px;
  font-size: 12px;
  color: var(--text-dim);
}

.pixel-divider {
  height: 4px;
  margin: 0 auto 16px;
  max-width: 300px;
  background: repeating-linear-gradient(
    90deg,
    var(--accent) 0px,
    var(--accent) 4px,
    transparent 4px,
    transparent 8px
  );
  opacity: 0.4;
}

#footer a {
  color: var(--accent);
  text-decoration: none;
}

#footer a:hover {
  text-decoration: underline;
}

#pixel-counter {
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--text);
}

/* TOAST */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  padding: 10px 20px;
  border-radius: 4px;
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.hidden {
  display: none !important;
}

/* RESPONSIVE */
@media (max-width: 800px) {
  #workspace {
    flex-direction: column;
  }

  #controls-panel {
    width: 100%;
    max-height: none;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px;
  }

  .control-group {
    min-width: 140px;
    flex: 1;
  }

  .export-group {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .export-group .btn {
    width: auto;
    flex: 1;
    min-width: 100px;
  }

  #canvas-container {
    min-height: 300px;
  }
}