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

:root {
  --bg-deep: #0a0a1a;
  --bg-panel: #12122a;
  --bg-card: #1a1a3e;
  --green-glow: #00ff41;
  --amber: #ffb000;
  --cyan: #00d4ff;
  --magenta: #ff00ff;
  --red: #ff3344;
  --white: #e0e0f0;
  --dim: #555577;
  --key-bg: #d4c8a0;
  --key-border: #a09070;
  --key-text: #222;
  --scanline-alpha: 0.04;
}

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

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 255, 65, var(--scanline-alpha)) 2px,
    rgba(0, 255, 65, var(--scanline-alpha)) 4px
  );
}

/* CRT bezel for screen */
.crt-bezel {
  background: #222;
  border-radius: 20px;
  padding: 16px;
  box-shadow:
    inset 0 0 60px rgba(0,0,0,0.8),
    0 0 20px rgba(0, 255, 65, 0.15);
  position: relative;
  overflow: hidden;
}

.crt-bezel::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,0.6) 100%);
  pointer-events: none;
  z-index: 2;
}

.crt-screen {
  image-rendering: pixelated;
  border-radius: 8px;
  position: relative;
  z-index: 1;
}

/* Power LED */
@keyframes pulse-led {
  0%, 100% { box-shadow: 0 0 4px 2px rgba(0,255,65,0.6); }
  50% { box-shadow: 0 0 8px 4px rgba(0,255,65,1); }
}

.power-led {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green-glow);
  animation: pulse-led 2s infinite;
  display: inline-block;
}

.power-led.off {
  background: #333;
  animation: none;
  box-shadow: none;
}

/* Tab styling */
.tab-btn {
  font-family: 'Press Start 2P', cursive;
  font-size: 9px;
  padding: 8px 12px;
  border: 1px solid var(--dim);
  background: var(--bg-panel);
  color: var(--dim);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.tab-btn.active {
  color: var(--green-glow);
  border-color: var(--green-glow);
  background: var(--bg-card);
  text-shadow: 0 0 8px var(--green-glow);
}

/* Keyboard keys */
.oric-key {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  min-width: 36px;
  height: 36px;
  border-radius: 4px;
  background: linear-gradient(180deg, #e8dcc0 0%, #c8bc9a 100%);
  color: var(--key-text);
  border: 1px solid var(--key-border);
  box-shadow: 0 3px 0 #8a7e60, 0 4px 6px rgba(0,0,0,0.3);
  cursor: pointer;
  transition: all 0.08s;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  padding: 0 6px;
}

.oric-key:active, .oric-key.pressed {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #8a7e60, 0 2px 3px rgba(0,0,0,0.2);
  background: linear-gradient(180deg, #d0c8a8 0%, #b0a880 100%);
}

.oric-key.highlight-col {
  box-shadow: 0 3px 0 #8a7e60, 0 0 12px var(--cyan);
  border-color: var(--cyan);
}

.oric-key.highlight-row {
  box-shadow: 0 3px 0 #8a7e60, 0 0 12px var(--amber);
  border-color: var(--amber);
}

.oric-key.highlight-both {
  box-shadow: 0 3px 0 #8a7e60, 0 0 16px var(--green-glow);
  border-color: var(--green-glow);
  background: linear-gradient(180deg, #b0f0b0 0%, #80d080 100%);
}

/* Memory map regions */
.mem-region {
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid transparent;
}

.mem-region:hover {
  border-color: #fff;
  filter: brightness(1.3);
  transform: scaleY(1.05);
}

/* Hex viewer */
.hex-line {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  line-height: 1.6;
}

.hex-line .addr { color: var(--amber); }
.hex-line .byte { color: var(--green-glow); }
.hex-line .ascii { color: var(--cyan); }

/* Chip diagram */
.chip-body {
  background: #1a1a1a;
  border: 2px solid #555;
  border-radius: 4px;
  position: relative;
}

.chip-notch {
  width: 20px; height: 10px;
  border-radius: 0 0 10px 10px;
  background: var(--bg-deep);
  border: 2px solid #555;
  border-top: none;
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
}

.chip-pin {
  font-size: 8px;
  color: var(--dim);
  padding: 1px 3px;
}

.chip-pin.active {
  color: var(--green-glow);
  text-shadow: 0 0 6px var(--green-glow);
}

/* Signal flow line */
@keyframes signal-flow {
  0% { stroke-dashoffset: 20; }
  100% { stroke-dashoffset: 0; }
}

.signal-line {
  stroke: var(--green-glow);
  stroke-width: 2;
  stroke-dasharray: 5 5;
  animation: signal-flow 0.5s linear infinite;
  filter: drop-shadow(0 0 3px var(--green-glow));
}

.signal-line.inactive {
  stroke: var(--dim);
  animation: none;
  filter: none;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--dim);
  border-radius: 12px;
  transition: all 0.3s;
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--cyan);
  background: rgba(0, 212, 255, 0.05);
}

/* Character grid */
.char-cell {
  border: 1px solid rgba(255,255,255,0.1);
  cursor: pointer;
  transition: all 0.1s;
  image-rendering: pixelated;
}

.char-cell:hover {
  border-color: var(--cyan);
  transform: scale(1.1);
  z-index: 10;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--dim); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan); }

/* Responsive */
@media (max-width: 768px) {
  .tab-btn { font-size: 7px; padding: 6px 8px; }
  .oric-key { min-width: 28px; height: 28px; font-size: 9px; }
}

/* Footer */
.retro-footer a {
  color: var(--cyan);
  text-decoration: none;
}
.retro-footer a:hover {
  text-decoration: underline;
  text-shadow: 0 0 8px var(--cyan);
}