:root {
  --phosphor: #33ff33;
  --phosphor-dim: #1a8c1a;
  --phosphor-glow: #33ff3344;
  --amber: #ffaa00;
  --amber-dim: #996600;
  --crt-bg: #0a0a0a;
  --bezel: #2a2a2a;
  --dark-bg: #1a1a1a;
  --darker-bg: #111111;
}

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

body {
  background-color: var(--dark-bg);
  color: var(--phosphor);
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, #0f1a0f 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, #0f1a0f 0%, transparent 50%),
    repeating-linear-gradient(0deg, transparent, transparent 2px, #0d0d0d11 2px, #0d0d0d11 4px);
  pointer-events: none;
  z-index: 0;
}

.crt-container {
  position: relative;
  background: var(--bezel);
  border-radius: 20px;
  padding: 24px;
  box-shadow:
    0 0 0 2px #3a3a3a,
    0 0 0 4px #1a1a1a,
    inset 0 0 30px rgba(0,0,0,0.5),
    0 8px 32px rgba(0,0,0,0.6),
    0 0 60px var(--phosphor-glow);
}

.crt-screen {
  position: relative;
  background: var(--crt-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 2px solid #333;
}

.crt-screen::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 1px,
    rgba(0, 0, 0, 0.15) 1px,
    rgba(0, 0, 0, 0.15) 2px
  );
  pointer-events: none;
  z-index: 10;
}

.crt-screen::after {
  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: 11;
}

.screen-content {
  font-family: 'VT323', monospace;
  color: var(--phosphor);
  text-shadow: 0 0 5px var(--phosphor), 0 0 10px var(--phosphor-glow);
  white-space: pre;
  line-height: 1.2;
  letter-spacing: 0.5px;
  padding: 16px;
  position: relative;
  z-index: 5;
}

.crt-poweron {
  animation: crt-on 0.5s ease-out;
}

@keyframes crt-on {
  0% { opacity: 0; transform: scaleY(0.01); filter: brightness(3); }
  40% { opacity: 1; transform: scaleY(0.01); filter: brightness(3); }
  60% { transform: scaleY(1.02); filter: brightness(1.5); }
  80% { transform: scaleY(0.99); filter: brightness(1.1); }
  100% { transform: scaleY(1); filter: brightness(1); }
}

.crt-poweroff {
  animation: crt-off 0.3s ease-in forwards;
}

@keyframes crt-off {
  0% { opacity: 1; transform: scaleY(1); filter: brightness(1); }
  40% { opacity: 1; transform: scaleY(0.01); filter: brightness(3); }
  100% { opacity: 0; transform: scaleY(0); filter: brightness(0); }
}

.led-blink {
  animation: led-pulse 1s ease-in-out infinite;
}

@keyframes led-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.retro-btn {
  font-family: 'Share Tech Mono', monospace;
  background: linear-gradient(180deg, #4a4a4a 0%, #2a2a2a 50%, #1a1a1a 100%);
  color: var(--phosphor);
  border: 2px solid #555;
  border-radius: 4px;
  padding: 8px 16px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 12px;
  transition: all 0.1s;
  box-shadow: 0 3px 0 #111, 0 4px 6px rgba(0,0,0,0.3);
  position: relative;
  user-select: none;
}

.retro-btn:hover {
  background: linear-gradient(180deg, #5a5a5a 0%, #3a3a3a 50%, #2a2a2a 100%);
}

.retro-btn:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #111, 0 2px 3px rgba(0,0,0,0.3);
}

.retro-btn-power {
  background: linear-gradient(180deg, #3a1a1a 0%, #2a0a0a 50%, #1a0000 100%);
  border-color: #661a1a;
  color: #ff4444;
}

.retro-btn-power.active {
  background: linear-gradient(180deg, #1a3a1a 0%, #0a2a0a 50%, #001a00 100%);
  border-color: #1a6644;
  color: var(--phosphor);
  box-shadow: 0 3px 0 #111, 0 4px 6px rgba(0,0,0,0.3), 0 0 10px var(--phosphor-glow);
}

.drop-zone {
  border: 2px dashed var(--phosphor-dim);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--phosphor);
  background: rgba(51, 255, 51, 0.05);
  box-shadow: 0 0 20px var(--phosphor-glow);
}

.rom-slot {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--darker-bg);
  border-radius: 4px;
  font-size: 13px;
}

.cursor-blink {
  animation: cursor-blink-anim 0.6s step-end infinite;
}

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

.panel-section {
  background: var(--darker-bg);
  border: 1px solid #333;
  border-radius: 8px;
  padding: 16px;
}

.register-display {
  font-family: 'VT323', monospace;
  font-size: 16px;
  color: var(--amber);
  background: #0a0800;
  padding: 8px 12px;
  border-radius: 4px;
  border: 1px solid var(--amber-dim);
}

.log-area {
  font-family: 'VT323', monospace;
  font-size: 14px;
  color: var(--phosphor-dim);
  background: var(--crt-bg);
  border: 1px solid #222;
  border-radius: 4px;
  padding: 8px;
  max-height: 150px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.log-area::-webkit-scrollbar { width: 6px; }
.log-area::-webkit-scrollbar-track { background: var(--crt-bg); }
.log-area::-webkit-scrollbar-thumb { background: var(--phosphor-dim); border-radius: 3px; }

.speed-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: #333;
  border-radius: 3px;
  outline: none;
}

.speed-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--phosphor);
  cursor: pointer;
  box-shadow: 0 0 8px var(--phosphor-glow);
}

.memory-block {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 2px;
  font-size: 11px;
  margin: 1px;
  cursor: pointer;
  transition: all 0.2s;
}

.memory-block:hover {
  filter: brightness(1.3);
  transform: scale(1.05);
}

.bezel-label {
  position: absolute;
  bottom: 6px;
  right: 16px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 10px;
  color: #555;
  letter-spacing: 2px;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .crt-container {
    padding: 12px;
    border-radius: 12px;
  }
  .screen-content {
    font-size: 10px;
    padding: 8px;
  }
}