:root {
  --dos-blue: #0000AA;
  --dos-blue-light: #0000CC;
  --dos-cyan: #00AAAA;
  --dos-white: #AAAAAA;
  --dos-bright-white: #FFFFFF;
  --dos-yellow: #FFFF55;
  --dos-green: #55FF55;
  --dos-red: #FF5555;
  --dos-magenta: #FF55FF;
  --dos-gray: #555555;
  --dos-dark: #000055;
}

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

body {
  background: #000000;
  color: var(--dos-bright-white);
  font-family: 'Press Start 2P', monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

/* CRT Scanline Effect */
.crt-overlay {
  pointer-events: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.08) 0px,
    rgba(0, 0, 0, 0.08) 1px,
    transparent 1px,
    transparent 3px
  );
}

/* CRT Flicker */
.crt-overlay::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(0,0,0,0.3) 100%);
}

/* Blinking cursor */
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.cursor-blink {
  animation: blink 1s step-end infinite;
  display: inline-block;
}

/* DOS-style box */
.dos-box {
  border: 2px solid var(--dos-cyan);
  background: var(--dos-blue);
  position: relative;
}

.dos-box-title {
  background: var(--dos-cyan);
  color: var(--dos-dark);
  padding: 2px 8px;
  font-size: 10px;
  display: inline-block;
  position: absolute;
  top: -2px;
  left: 8px;
}

/* DOS button */
.dos-btn {
  background: var(--dos-white);
  color: #000000;
  border: none;
  padding: 4px 12px;
  font-family: 'Press Start 2P', monospace;
  font-size: 10px;
  cursor: pointer;
  box-shadow: 2px 2px 0px #000000;
  transition: none;
  text-transform: uppercase;
}

.dos-btn:hover {
  background: var(--dos-bright-white);
}

.dos-btn:active {
  box-shadow: 0px 0px 0px #000000;
  transform: translate(2px, 2px);
}

.dos-btn-primary {
  background: var(--dos-cyan);
  color: var(--dos-dark);
}

.dos-btn-primary:hover {
  background: #00CCCC;
}

/* Dropdown / Select */
.dos-select {
  background: #000033;
  color: var(--dos-yellow);
  border: 1px solid var(--dos-cyan);
  padding: 4px 8px;
  font-family: 'Press Start 2P', monospace;
  font-size: 10px;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.dos-select option {
  background: #000033;
  color: var(--dos-yellow);
}

/* Input */
.dos-input {
  background: #000033;
  color: var(--dos-yellow);
  border: 1px solid var(--dos-cyan);
  padding: 4px 8px;
  font-family: 'Press Start 2P', monospace;
  font-size: 10px;
  width: 80px;
}

.dos-input:focus {
  outline: none;
  border-color: var(--dos-yellow);
}

/* Toggle checkbox */
.dos-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 10px;
}

.dos-toggle input {
  display: none;
}

.dos-toggle-box {
  width: 16px;
  height: 16px;
  border: 1px solid var(--dos-cyan);
  background: #000033;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  line-height: 1;
}

/* Code output */
.code-output {
  background: #000088;
  color: var(--dos-yellow);
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  line-height: 1.6;
  padding: 12px;
  overflow: auto;
  white-space: pre;
  tab-size: 2;
  max-height: 400px;
}

/* Pixelated canvas */
.pixel-canvas {
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

/* Progress bar */
.dos-progress {
  background: #000033;
  border: 1px solid var(--dos-cyan);
  height: 20px;
  padding: 2px;
  position: relative;
}

.dos-progress-fill {
  background: var(--dos-green);
  height: 100%;
  transition: width 0.1s linear;
}

.dos-progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 8px;
  color: var(--dos-bright-white);
  text-shadow: 1px 1px 0 #000;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--dos-cyan);
  background: rgba(0, 0, 85, 0.5);
  transition: background 0.15s;
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.drag-over {
  background: rgba(0, 0, 170, 0.8);
  border-color: var(--dos-yellow);
}

/* Palette display */
.palette-color {
  width: 16px;
  height: 16px;
  display: inline-block;
  border: 1px solid #000;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 14px;
  height: 14px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--dos-cyan);
  border: 1px solid var(--dos-dark);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--dos-white);
}

/* Syntax highlighting classes */
.syn-keyword { color: var(--dos-bright-white); font-weight: bold; }
.syn-number { color: var(--dos-yellow); }
.syn-comment { color: var(--dos-green); }
.syn-string { color: var(--dos-magenta); }
.syn-operator { color: var(--dos-cyan); }

/* Mobile adjustments */
@media (max-width: 768px) {
  .dos-box-title {
    font-size: 8px;
  }
}