:root {
  --bg-deep: #0D0D1A;
  --bg-panel: #1A1A2E;
  --bg-panel-alt: #141428;
  --border: #2A2A4A;
  --border-light: #3A3A5A;
  --text: #E0E0E0;
  --text-dim: #8888AA;
  --amber: #FFB000;
  --amber-dim: #7A5500;
  --green: #33FF33;
  --green-dim: #1A7A1A;
  --cyan: #00CED1;
  --gold: #FFD700;
  --red: #FF4444;
  --success: #44FF44;
  --phosphor: #FFB000;
}

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

body {
  background: var(--bg-deep);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

/* CRT Screen Effects */
.crt-screen {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
}

.crt-screen canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

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

.crt-curvature {
  border-radius: 20px;
  /* Subtle barrel distortion illusion */
  box-shadow:
    inset 0 0 60px rgba(0,0,0,0.4),
    inset 0 0 10px rgba(0,0,0,0.3);
}

.crt-glow {
  box-shadow:
    0 0 20px rgba(255, 176, 0, 0.15),
    0 0 60px rgba(255, 176, 0, 0.05),
    inset 0 0 30px rgba(0,0,0,0.3);
}

.crt-glow-green {
  box-shadow:
    0 0 20px rgba(51, 255, 51, 0.15),
    0 0 60px rgba(51, 255, 51, 0.05),
    inset 0 0 30px rgba(0,0,0,0.3);
}

/* CRT Monitor Bezel */
.monitor-bezel {
  background: linear-gradient(145deg, #c8b89a 0%, #a89878 30%, #8a7a60 70%, #6a5a40 100%);
  border-radius: 20px;
  padding: 20px;
  box-shadow:
    0 4px 20px rgba(0,0,0,0.6),
    inset 0 1px 0 rgba(255,255,255,0.2),
    inset 0 -1px 0 rgba(0,0,0,0.3);
}

.monitor-inner {
  background: #111;
  border-radius: 14px;
  padding: 8px;
  box-shadow: inset 0 2px 10px rgba(0,0,0,0.8);
}

/* Panel Styles */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.panel-header {
  background: linear-gradient(180deg, #252545 0%, #1e1e3a 100%);
  border-bottom: 1px solid var(--border);
  padding: 6px 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
}

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

.led-green { background: var(--success); box-shadow: 0 0 6px var(--success); }
.led-red { background: var(--red); box-shadow: 0 0 6px var(--red); }
.led-amber { background: var(--amber); box-shadow: 0 0 6px var(--amber); }
.led-off { background: #333; box-shadow: none; }

/* Retro Buttons */
.retro-btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  padding: 6px 14px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all 0.1s;
  position: relative;
}

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

.retro-btn-power {
  background: linear-gradient(180deg, #4a4a4a, #333);
  color: var(--success);
  border: 1px solid #555;
  box-shadow: 0 2px 4px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.1);
}

.retro-btn-power:hover { background: linear-gradient(180deg, #555, #3a3a3a); }

.retro-btn-danger {
  background: linear-gradient(180deg, #6a2222, #4a1818);
  color: var(--red);
  border: 1px solid #7a3333;
  box-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

.retro-btn-danger:hover { background: linear-gradient(180deg, #7a2828, #5a1e1e); }

.retro-btn-amber {
  background: linear-gradient(180deg, #5a4a1a, #3a3010);
  color: var(--amber);
  border: 1px solid #6a5a2a;
  box-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

.retro-btn-amber:hover { background: linear-gradient(180deg, #6a5520, #4a3a15); }

.retro-btn-cyan {
  background: linear-gradient(180deg, #1a4a4a, #103a3a);
  color: var(--cyan);
  border: 1px solid #2a5a5a;
  box-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

.retro-btn-cyan:hover { background: linear-gradient(180deg, #205555, #154040); }

/* Hex Keypad */
.hex-key {
  width: 44px;
  height: 36px;
  background: linear-gradient(180deg, #d4c4a4, #b4a484);
  border: 1px solid #8a7a5a;
  border-radius: 4px;
  color: #2a2a2a;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.4);
  transition: all 0.05s;
}

.hex-key:active {
  transform: translateY(2px);
  box-shadow: 0 0 2px rgba(0,0,0,0.3);
  background: linear-gradient(180deg, #b4a484, #a49474);
}

.hex-key-fn {
  background: linear-gradient(180deg, #8a4a2a, #6a3a1a);
  color: #FFB000;
  border-color: #5a2a0a;
}

.hex-key-fn:active {
  background: linear-gradient(180deg, #6a3a1a, #5a2a0a);
}

/* Memory Inspector */
.mem-byte {
  cursor: pointer;
  padding: 0 2px;
  border-radius: 2px;
  transition: background 0.3s;
}

.mem-byte:hover { background: rgba(255,176,0,0.2); }
.mem-byte-rom { color: var(--cyan); }
.mem-byte-io { color: var(--gold); }
.mem-byte-vdu { color: #FF88FF; }
.mem-byte-read { animation: flash-green 0.5s; }
.mem-byte-write { animation: flash-red 0.5s; }

@keyframes flash-green {
  0% { background: rgba(51,255,51,0.4); }
  100% { background: transparent; }
}

@keyframes flash-red {
  0% { background: rgba(255,68,68,0.4); }
  100% { background: transparent; }
}

/* Flag LEDs */
.flag-bit {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
}

.flag-bit-set { border-color: var(--success); }
.flag-bit-clear { border-color: var(--border); opacity: 0.6; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* File Drop Zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  transition: all 0.2s;
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--amber);
  background: rgba(255,176,0,0.05);
}

/* VDU Sync indicator pulse */
@keyframes vdu-sync-pulse {
  0%, 100% { box-shadow: 0 0 3px rgba(51,255,51,0.3); }
  50% { box-shadow: 0 0 8px rgba(51,255,51,0.6); }
}

.vdu-sync-active {
  animation: vdu-sync-pulse 2s ease-in-out infinite;
}

/* Help panel styling */
.help-section {
  margin-bottom: 12px;
  padding-left: 10px;
}

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

@media (max-width: 768px) {
  .monitor-bezel { padding: 10px; border-radius: 12px; }
}

/* Console */
.console-log {
  font-size: 11px;
  line-height: 1.5;
  overflow-y: auto;
  max-height: 200px;
}

.log-info { color: var(--text-dim); }
.log-io { color: var(--gold); }
.log-error { color: var(--red); }
.log-success { color: var(--success); }

/* Register display */
.reg-value {
  font-family: 'Share Tech Mono', monospace;
  font-size: 16px;
  color: var(--amber);
  background: rgba(0,0,0,0.4);
  padding: 2px 8px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

/* Mini memory map */
.memory-map-bar {
  height: 12px;
  background: #111;
  border-radius: 2px;
  overflow: hidden;
  display: flex;
}

/* Tabs */
.tab {
  padding: 6px 14px;
  font-size: 11px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  transition: all 0.15s;
}
.tab:hover { color: var(--text); }
.tab-active { color: var(--amber); border-bottom-color: var(--amber); }