:root {
  --beige: #C8B68C;
  --beige-light: #D8CAA0;
  --beige-dark: #A89868;
  --charcoal: #2D2D2D;
  --ibm-blue: #0052CC;
  --phosphor: #33FF33;
  --phosphor-dim: #115511;
  --amber: #FFB000;
  --crt-black: #0A0A0A;
  --bg-dark: #2a2a3e;
  --bg-darker: #1e1e30;
  --panel-bg: #353560;
}

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

body {
  background: var(--bg-dark);
  font-family: 'IBM Plex Mono', monospace;
  color: #ddd;
  overflow-x: hidden;
}

/* CRT Effects */
@keyframes flicker {
  0% { opacity: 0.97; }
  5% { opacity: 0.95; }
  10% { opacity: 0.98; }
  15% { opacity: 0.96; }
  20% { opacity: 0.99; }
  50% { opacity: 0.96; }
  80% { opacity: 0.98; }
  100% { opacity: 0.97; }
}

@keyframes scanline-move {
  0% { transform: translateY(0); }
  100% { transform: translateY(4px); }
}

@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 4px #33ff33, 0 0 8px #33ff33; background: #33ff33; }
  50% { box-shadow: 0 0 8px #33ff33, 0 0 16px #33ff33, 0 0 24px #115511; background: #55ff55; }
}

@keyframes pulse-amber {
  0%, 100% { box-shadow: 0 0 4px var(--amber), 0 0 8px var(--amber); background: var(--amber); }
  50% { box-shadow: 0 0 8px var(--amber), 0 0 16px var(--amber); background: #ffc433; }
}

@keyframes value-flash {
  0% { color: #ffff00; text-shadow: 0 0 6px #ffff00; }
  100% { color: inherit; text-shadow: none; }
}

.crt-container {
  position: relative;
  border-radius: 20px;
  padding: 24px;
  background: linear-gradient(145deg, var(--beige-light), var(--beige-dark));
  box-shadow:
    inset 0 2px 4px rgba(255,255,255,0.3),
    inset 0 -2px 4px rgba(0,0,0,0.3),
    0 8px 32px rgba(0,0,0,0.5),
    0 2px 8px rgba(0,0,0,0.3);
}

.crt-screen {
  position: relative;
  background: var(--crt-black);
  border-radius: 12px;
  overflow: hidden;
  box-shadow:
    inset 0 0 60px rgba(0,0,0,0.8),
    inset 0 0 20px rgba(0,0,0,0.5),
    0 0 2px rgba(51,255,51,0.1);
}

.crt-screen::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 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: 2;
  animation: scanline-move 0.1s linear infinite;
}

.crt-screen::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,0.4) 100%);
  pointer-events: none;
  z-index: 3;
}

.crt-screen canvas {
  display: block;
  width: 100%;
  height: 100%;
  animation: flicker 4s infinite;
  image-rendering: pixelated;
}

/* Panel Styles */
.retro-panel {
  background: linear-gradient(180deg, #484870, #383858);
  border: 2px solid #6a6a9a;
  border-radius: 8px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.15),
    0 4px 12px rgba(0,0,0,0.4);
}

.retro-panel-beige {
  background: linear-gradient(180deg, var(--beige-light), var(--beige));
  border: 2px solid var(--beige-dark);
  border-radius: 8px;
  color: #333;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.4),
    inset 0 -1px 0 rgba(0,0,0,0.2),
    0 4px 12px rgba(0,0,0,0.3);
}

/* Buttons */
.btn-retro {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
  font-size: 11px;
  padding: 6px 14px;
  border-radius: 4px;
  border: 2px outset #666;
  cursor: pointer;
  transition: all 0.1s;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-retro:active {
  border-style: inset;
  transform: translateY(1px);
}

.btn-power-on {
  background: linear-gradient(180deg, #44cc44, #228822);
  color: #fff;
  border-color: #339933;
  box-shadow: 0 0 8px rgba(51,255,51,0.3);
}

.btn-power-off {
  background: linear-gradient(180deg, #cc4444, #882222);
  color: #fff;
  border-color: #993333;
  box-shadow: 0 0 8px rgba(255,51,51,0.3);
}

.btn-blue {
  background: linear-gradient(180deg, #3366dd, #2244aa);
  color: #fff;
  border-color: #4477ee;
}

.btn-gray {
  background: linear-gradient(180deg, #777, #555);
  color: #eee;
  border-color: #888;
}

.btn-amber {
  background: linear-gradient(180deg, #cc8800, #aa6600);
  color: #fff;
  border-color: #dd9900;
}

/* LED indicators */
.led {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  border: 1px solid rgba(0,0,0,0.3);
}

.led-on {
  background: #33ff33;
  animation: pulse-green 2s ease-in-out infinite;
}

.led-off {
  background: #444;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.5);
}

.led-flag-on {
  background: #33ff33;
  box-shadow: 0 0 4px #33ff33;
}

.led-flag-off {
  background: #333;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.5);
}

/* Register display */
.reg-label {
  font-size: 10px;
  color: #aab;
  font-weight: 400;
}

.reg-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--phosphor);
  font-family: 'IBM Plex Mono', monospace;
}

.reg-value.changed {
  animation: value-flash 0.6s ease-out;
}

/* Hex viewer */
.hex-viewer {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  line-height: 1.6;
  color: #aaa;
}

.hex-addr { color: var(--amber); }
.hex-byte { color: #ccc; }
.hex-byte-rom { color: #ff6688; }
.hex-byte-vram { color: #66aaff; }
.hex-byte-ivt { color: #ffaa33; }
.hex-ascii { color: #889; }
.hex-current { background: rgba(51,255,51,0.2); color: var(--phosphor); }

/* Floppy drive */
.floppy-slot {
  background: linear-gradient(180deg, #555, #333);
  border: 2px inset #444;
  border-radius: 2px;
  height: 8px;
  margin: 8px 12px;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #1a1a2e; }
::-webkit-scrollbar-thumb { background: #4a4a6a; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #5a5a7a; }

/* Press Start 2P heading */
.retro-heading {
  font-family: 'Press Start 2P', cursive;
}

/* Responsive */
@media (max-width: 1024px) {
  .desktop-sidebar { display: none; }
}

@media (max-width: 640px) {
  .crt-container { padding: 12px; border-radius: 12px; }
}