* { margin:0; padding:0; box-sizing:border-box; }
body {
  background: #0a0a0a;
  color: #33ff33;
  font-family: 'IBM Plex Mono', 'Fira Code', 'Courier New', monospace;
  overflow-x: hidden;
}

:root {
  --green: #33ff33;
  --cyan: #00ccff;
  --amber: #ff6600;
  --red: #ff3333;
  --bg: #0a0a0a;
  --panel-bg: #0d1117;
  --border: #1a3a1a;
}

.crt-overlay {
  pointer-events: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,0,0,0.15) 0px,
    rgba(0,0,0,0.15) 1px,
    transparent 1px,
    transparent 3px
  );
  z-index: 9999;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 0 10px rgba(51,255,51,0.08), inset 0 0 30px rgba(0,0,0,0.5);
  overflow: hidden;
}

.panel-header {
  background: linear-gradient(180deg, #132013 0%, #0d1117 100%);
  border-bottom: 1px solid var(--border);
  padding: 6px 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--cyan);
}

.glow-green { text-shadow: 0 0 8px rgba(51,255,51,0.6); }
.glow-cyan { text-shadow: 0 0 8px rgba(0,204,255,0.5); }
.glow-amber { text-shadow: 0 0 8px rgba(255,102,0,0.5); }

.btn-retro {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
  font-size: 12px;
  padding: 8px 14px;
  border: 2px solid;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: transparent;
}
.btn-retro:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 12px currentColor;
}
.btn-retro:active {
  transform: translateY(1px);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.5);
}

.btn-green { color: var(--green); border-color: var(--green); }
.btn-green:hover { background: rgba(51,255,51,0.1); }
.btn-red { color: var(--red); border-color: var(--red); }
.btn-red:hover { background: rgba(255,51,51,0.1); }
.btn-amber { color: var(--amber); border-color: var(--amber); }
.btn-amber:hover { background: rgba(255,102,0,0.1); }
.btn-cyan { color: var(--cyan); border-color: var(--cyan); }
.btn-cyan:hover { background: rgba(0,204,255,0.1); }
.btn-yellow { color: #ffcc00; border-color: #ffcc00; }
.btn-yellow:hover { background: rgba(255,204,0,0.1); }
.btn-purple { color: #cc66ff; border-color: #cc66ff; }
.btn-purple:hover { background: rgba(204,102,255,0.1); }

.hex-byte {
  display: inline-block;
  width: 24px;
  text-align: center;
  cursor: pointer;
  font-size: 12px;
  line-height: 20px;
  border-radius: 2px;
  transition: background 0.1s;
}
.hex-byte:hover { background: rgba(51,255,51,0.15); }
.hex-byte.pc-highlight { background: rgba(51,255,51,0.25); color: #fff; }
.hex-byte.stack-area { background: rgba(0,204,255,0.06); }
.hex-byte.zp-area { background: rgba(255,102,0,0.04); }
.hex-byte.vector-area { background: rgba(0,204,255,0.15); }
.hex-byte.breakpoint { background: rgba(255,51,51,0.25); }

.flag-led {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid #1a3a1a;
  font-size: 10px;
  font-weight: 700;
  transition: all 0.2s;
}
.flag-led.on {
  background: radial-gradient(circle, #33ff33 30%, #1a6b1a 100%);
  border-color: #33ff33;
  color: #000;
  box-shadow: 0 0 8px rgba(51,255,51,0.5);
}
.flag-led.off {
  background: #111;
  color: #333;
  border-color: #222;
}

@keyframes flash-amber {
  0% { color: var(--amber); text-shadow: 0 0 8px var(--amber); }
  100% { color: var(--green); text-shadow: none; }
}
.value-changed { animation: flash-amber 0.4s ease-out; }

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.pulse { animation: pulse-dot 1s ease-in-out infinite; }

@keyframes scanline-anim {
  0% { background-position: 0 0; }
  100% { background-position: 0 100vh; }
}

.oscilloscope-line {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--green), var(--cyan), var(--green), transparent);
  opacity: 0.6;
}

.toggle-switch {
  position: relative;
  width: 40px;
  height: 20px;
  background: #222;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.3s;
  border: 1px solid #333;
}
.toggle-switch.on { background: var(--red); border-color: var(--red); }
.toggle-switch::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  top: 1px;
  left: 1px;
  transition: transform 0.3s;
}
.toggle-switch.on::after { transform: translateX(20px); }

.pixel-display {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

input[type="text"], input[type="number"], textarea, select {
  background: #111;
  border: 1px solid var(--border);
  color: var(--green);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  padding: 6px 8px;
  border-radius: 3px;
  outline: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--green);
  box-shadow: 0 0 5px rgba(51,255,51,0.2);
}

select option { background: #111; color: var(--green); }

input[type="range"] {
  -webkit-appearance: none;
  background: #222;
  height: 4px;
  border-radius: 2px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--green);
  border-radius: 50%;
  cursor: pointer;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #0a0a0a; }
::-webkit-scrollbar-thumb { background: #1a3a1a; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #2a5a2a; }

.disasm-line { padding: 1px 8px; font-size: 12px; white-space: nowrap; }
.disasm-line.current { background: rgba(51,255,51,0.15); color: #fff; font-weight: 600; }

.tab-btn {
  padding: 4px 12px;
  font-size: 11px;
  font-family: 'IBM Plex Mono', monospace;
  background: transparent;
  border: 1px solid var(--border);
  color: #666;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.tab-btn.active {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0,204,255,0.05);
}

@media (max-width: 1200px) {
  .main-grid { grid-template-columns: 1fr !important; }
}