:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #0d1117;
  --bg-panel: #111820;
  --bg-input: #0d1117;
  --border: #1e2a3a;
  --text-primary: #00ff41;
  --text-secondary: #00cc33;
  --text-dim: #006622;
  --text-muted: #3a5a3a;
  --accent: #00ff41;
  --accent-dim: #004d13;
  --highlight: #ff4444;
  --changed: #ff6600;
  --cyan: #00e5ff;
  --yellow: #ffdd00;
  --amber: #ffb000;
  --magenta: #ff00ff;
  --scanline-opacity: 0.03;
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', 'Share Tech Mono', monospace;
  overflow: hidden;
  height: 100vh;
}

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, var(--scanline-opacity)) 2px,
    rgba(0, 0, 0, var(--scanline-opacity)) 4px
  );
}

/* CRT glow effect */
.crt-glow {
  text-shadow: 0 0 5px var(--accent), 0 0 10px rgba(0, 255, 65, 0.3);
}

.crt-glow-subtle {
  text-shadow: 0 0 3px rgba(0, 255, 65, 0.4);
}

/* Panel styles */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.panel-header {
  background: linear-gradient(180deg, #1a2332 0%, #141c28 100%);
  border-bottom: 1px solid var(--border);
  padding: 6px 10px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.panel-header .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 4px var(--accent);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #2a3a4a; }

/* Button styles */
.btn-retro {
  background: linear-gradient(180deg, #1a2a1a 0%, #0d1a0d 100%);
  border: 1px solid var(--text-dim);
  color: var(--text-primary);
  padding: 5px 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.15s;
  border-radius: 2px;
}

.btn-retro:hover {
  background: linear-gradient(180deg, #2a4a2a 0%, #1a2a1a 100%);
  box-shadow: 0 0 8px rgba(0, 255, 65, 0.3);
  border-color: var(--accent);
}

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

.btn-retro.danger {
  border-color: #661111;
  color: #ff4444;
}
.btn-retro.danger:hover {
  box-shadow: 0 0 8px rgba(255,68,68,0.3);
  border-color: #ff4444;
}

.btn-retro.running {
  border-color: var(--amber);
  color: var(--amber);
  animation: pulse-amber 1s infinite;
}

@keyframes pulse-amber {
  0%, 100% { box-shadow: 0 0 4px rgba(255,176,0,0.3); }
  50% { box-shadow: 0 0 12px rgba(255,176,0,0.6); }
}

/* Code editor textarea */
.code-editor {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  padding: 8px;
  resize: none;
  outline: none;
  width: 100%;
  tab-size: 8;
}

.code-editor::selection {
  background: rgba(0, 255, 65, 0.2);
}

/* Flag indicators */
.flag-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 22px;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-size: 10px;
  font-weight: 700;
  transition: all 0.2s;
  cursor: pointer;
}

.flag-box.set {
  background: rgba(0, 255, 65, 0.2);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 6px rgba(0, 255, 65, 0.3);
}

.flag-box.clear {
  background: var(--bg-primary);
  border-color: #1a1a1a;
  color: #333;
}

.flag-box.changed {
  animation: flag-flash 0.5s ease-out;
}

@keyframes flag-flash {
  0% { background: rgba(255, 102, 0, 0.6); border-color: #ff6600; }
  100% { }
}

/* Register display */
.reg-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 1px;
}

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

@keyframes val-flash {
  0% { color: #ff6600; text-shadow: 0 0 8px rgba(255,102,0,0.8); }
  100% { }
}

/* Disassembly current line */
.current-instruction {
  background: rgba(0, 255, 65, 0.08) !important;
  border-left: 3px solid var(--accent) !important;
}

/* Breakpoint dot */
.breakpoint-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #ff4444;
  box-shadow: 0 0 4px rgba(255,68,68,0.6);
  display: inline-block;
  cursor: pointer;
}

/* Memory hex view */
.mem-byte { padding: 0 2px; cursor: pointer; font-size: 12px; }
.mem-byte:hover { background: rgba(0,255,65,0.15); }
.mem-byte.code-region { color: var(--accent); }
.mem-byte.stack-region { color: var(--magenta); }
.mem-byte.data-region { color: var(--yellow); }

/* CRT output screen */
.crt-screen {
  background: #000800;
  border: 2px solid #1a3a1a;
  border-radius: 8px;
  box-shadow: inset 0 0 30px rgba(0,0,0,0.5), 0 0 15px rgba(0,255,65,0.1);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.3;
  padding: 8px;
  color: var(--text-primary);
  white-space: pre;
  overflow: hidden;
}

/* Dropdown */
.retro-select {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.retro-select:focus {
  border-color: var(--accent);
}

/* Input field */
.retro-input {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 2px;
  outline: none;
}

.retro-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 4px rgba(0,255,65,0.2);
}

/* Tooltip */
.tooltip-content {
  position: absolute;
  background: #1a2a1a;
  border: 1px solid var(--accent);
  color: var(--text-primary);
  padding: 8px;
  font-size: 11px;
  border-radius: 4px;
  z-index: 1000;
  max-width: 300px;
  box-shadow: 0 0 10px rgba(0,255,65,0.2);
  pointer-events: none;
}

/* Slider */
input[type="range"] {
  -webkit-appearance: none;
  background: var(--bg-primary);
  height: 4px;
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 4px var(--accent);
}

/* Tab buttons */
.tab-btn {
  padding: 4px 10px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  transition: all 0.15s;
}

.tab-btn.active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0,255,65,0.05);
}

.tab-btn:hover {
  color: var(--text-secondary);
}

/* Error message */
.error-msg {
  color: #ff4444;
  background: rgba(255,68,68,0.1);
  border: 1px solid #441111;
  padding: 6px 10px;
  font-size: 12px;
  border-radius: 2px;
}

/* Footer */
.emu-footer {
  text-align: center;
  padding: 4px;
  font-size: 10px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.emu-footer a {
  color: var(--text-secondary);
  text-decoration: none;
}
.emu-footer a:hover {
  color: var(--accent);
  text-shadow: 0 0 4px var(--accent);
}