:root {
  --c64-blue: #4040E8;
  --c64-light-blue: #7878FF;
  --c64-border: #7878FF;
  --c64-dark: #2020A0;
  --c64-bg: #4040E8;
  --c64-text: #A0A0FF;
  --c64-white: #FFFFFF;
}

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

body {
  font-family: 'Press Start 2P', monospace;
  background: var(--c64-blue);
  color: var(--c64-text);
  min-height: 100vh;
  overflow-x: hidden;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
}

/* Header */
header {
  position: relative;
  text-align: center;
  padding: 32px 16px 24px;
  background: var(--c64-dark);
  border: 4px solid var(--c64-border);
  margin-bottom: 16px;
  overflow: hidden;
}

header h1 {
  font-size: clamp(24px, 6vw, 48px);
  color: var(--c64-white);
  text-shadow: 4px 4px 0 #000;
  letter-spacing: 4px;
  position: relative;
  z-index: 2;
}

header .subtitle {
  font-size: clamp(8px, 2vw, 12px);
  margin-top: 12px;
  color: var(--c64-light-blue);
  position: relative;
  z-index: 2;
}

.scanlines {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.15) 2px,
    rgba(0,0,0,0.15) 4px
  );
  pointer-events: none;
  z-index: 1;
}

/* Boot screen */
#boot-screen {
  background: var(--c64-blue);
  border: 4px solid var(--c64-border);
  padding: 24px;
  margin-bottom: 16px;
  font-size: clamp(8px, 1.8vw, 14px);
  line-height: 1.8;
  color: var(--c64-light-blue);
}

#boot-screen pre {
  font-family: 'Press Start 2P', monospace;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.blink {
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Upload Zone */
#upload-zone {
  border: 4px dashed var(--c64-border);
  background: rgba(0,0,0,0.2);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  margin-bottom: 16px;
  transition: background 0.2s;
  outline: none;
}

#upload-zone:hover,
#upload-zone:focus,
#upload-zone.dragover {
  background: rgba(120,120,255,0.15);
  border-color: var(--c64-white);
}

.load-cmd {
  font-size: clamp(10px, 2.5vw, 18px);
  color: var(--c64-white);
  margin-bottom: 16px;
}

.upload-sub {
  font-size: clamp(7px, 1.5vw, 10px);
  color: var(--c64-light-blue);
  margin-bottom: 8px;
}

/* Buttons */
.c64-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: clamp(8px, 1.5vw, 12px);
  background: var(--c64-dark);
  color: var(--c64-light-blue);
  border: 3px solid var(--c64-border);
  padding: 10px 16px;
  cursor: pointer;
  transition: all 0.1s;
  text-transform: uppercase;
  white-space: nowrap;
}

.c64-btn:hover {
  background: var(--c64-light-blue);
  color: var(--c64-dark);
}

.c64-btn.active {
  background: var(--c64-light-blue);
  color: #000;
}

#browse-btn {
  margin-top: 12px;
}

/* Controls */
#controls-panel {
  background: rgba(0,0,0,0.25);
  border: 4px solid var(--c64-border);
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-group label {
  font-size: clamp(7px, 1.3vw, 10px);
  color: var(--c64-light-blue);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.c64-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 12px;
  background: var(--c64-dark);
  border: 2px solid var(--c64-border);
  outline: none;
  cursor: pointer;
}

.c64-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--c64-light-blue);
  border: 2px solid var(--c64-white);
  cursor: pointer;
}

.c64-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--c64-light-blue);
  border: 2px solid var(--c64-white);
  cursor: pointer;
  border-radius: 0;
}

/* Palette */
#palette-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.palette-swatch {
  width: 28px;
  height: 28px;
  border: 3px solid var(--c64-white);
  cursor: pointer;
  transition: all 0.1s;
  position: relative;
}

.palette-swatch.disabled {
  border-color: #333;
  opacity: 0.3;
}

.palette-swatch.disabled::after {
  content: '×';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FF0000;
  font-size: 18px;
  font-family: 'Press Start 2P', monospace;
}

.toggle-label {
  font-size: clamp(7px, 1.3vw, 10px);
  color: var(--c64-light-blue);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.toggle-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--c64-light-blue);
}

/* Preview */
#preview-section {
  margin-bottom: 16px;
}

.preview-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 700px) {
  .preview-container {
    grid-template-columns: 1fr;
  }
}

.preview-box {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.preview-label {
  font-size: clamp(8px, 1.5vw, 11px);
  color: var(--c64-white);
  text-align: center;
}

.canvas-frame {
  border: 8px solid var(--c64-border);
  background: #000;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.canvas-frame canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

#output-frame.crt {
  border-radius: 16px;
  box-shadow: 0 0 40px rgba(120,120,255,0.3), inset 0 0 60px rgba(0,0,0,0.4);
}

.output-scanlines {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 1px,
    rgba(0,0,0,0.2) 1px,
    rgba(0,0,0,0.2) 2px
  );
  pointer-events: none;
  display: none;
}

.output-scanlines.active {
  display: block;
}

/* Export */
#export-panel {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

/* Footer */
footer {
  text-align: center;
  padding: 24px 16px;
  border-top: 3px solid var(--c64-border);
}

footer .ready {
  font-size: clamp(10px, 2vw, 14px);
  color: var(--c64-light-blue);
  margin-bottom: 8px;
}

#pixel-counter {
  font-size: clamp(6px, 1.2vw, 9px);
  color: var(--c64-text);
  margin-bottom: 8px;
}

.footer-link {
  font-family: 'Press Start 2P', monospace;
  font-size: clamp(7px, 1.2vw, 10px);
  color: var(--c64-white);
  text-decoration: underline;
}

.footer-link:hover {
  color: var(--c64-light-blue);
}

/* Utility */
.hidden {
  display: none !important;
}

/* CRT Flicker on Load */
@keyframes crtFlicker {
  0% { opacity: 0; }
  10% { opacity: 1; }
  12% { opacity: 0.3; }
  15% { opacity: 1; }
  30% { opacity: 0.8; }
  32% { opacity: 1; }
  100% { opacity: 1; }
}

body.flicker #app {
  animation: crtFlicker 1.5s ease-out;
}