:root {
  --bg-dark: #0A0A0A;
  --bg-panel: #111111;
  --bg-panel-alt: #1A1A1A;
  --border: #2A2A2A;
  --border-light: #3A3A3A;
  --green: #00FF00;
  --green-dim: #005500;
  --amber: #FFB000;
  --amber-dim: #553800;
  --cyan: #00FFFF;
  --magenta: #FF00FF;
  --red: #FF4444;
  --yellow: #FFFF00;
  --blue: #4488FF;
  --text: #CCCCCC;
  --text-dim: #666666;
  --white: #FFFFFF;
}

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

body {
  background: var(--bg-dark);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  background: #2A2A2A;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
  min-height: 36px;
}

.toolbar-title {
  color: var(--green);
  font-weight: 700;
  font-size: 13px;
  margin-right: 8px;
  white-space: nowrap;
}

.toolbar-title .blink {
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.toolbar-btn {
  background: #333;
  color: var(--text);
  border: 1px solid var(--border-light);
  padding: 3px 10px;
  font-family: inherit;
  font-size: 11px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}

.toolbar-btn:hover { background: #444; color: var(--white); }
.toolbar-btn:active { background: #555; }
.toolbar-btn.active { background: #225522; border-color: var(--green); color: var(--green); }

.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border-light);
  flex-shrink: 0;
}

.status-indicator {
  padding: 2px 8px;
  font-size: 10px;
  font-weight: 700;
  border: 1px solid;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.status-running { color: var(--green); border-color: var(--green-dim); background: rgba(0,255,0,0.08); }
.status-paused { color: var(--yellow); border-color: #555500; background: rgba(255,255,0,0.08); }
.status-halted { color: var(--red); border-color: #550000; background: rgba(255,0,0,0.08); }
.status-breakpoint { color: var(--blue); border-color: #224488; background: rgba(68,136,255,0.08); }

.speed-control {
  display: flex;
  align-items: center;
  gap: 4px;
}

.speed-control input[type="range"] {
  width: 80px;
  accent-color: var(--green);
}

.speed-label {
  color: var(--amber);
  font-size: 10px;
  min-width: 60px;
}

.cycle-counter {
  color: var(--cyan);
  font-size: 10px;
  margin-left: auto;
  white-space: nowrap;
}

.floppy-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #333;
  transition: background 0.2s;
}

.floppy-indicator.active {
  background: var(--red);
  box-shadow: 0 0 6px var(--red);
  animation: floppyBlink 0.3s ease infinite alternate;
}

@keyframes floppyBlink {
  from { opacity: 0.6; }
  to { opacity: 1; }
}

/* Main layout */
.main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Panels */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  padding: 4px 8px;
  background: #1E1E1E;
  border-bottom: 1px solid var(--border);
  font-size: 10px;
  font-weight: 600;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 1px;
  flex-shrink: 0;
}

.panel-content {
  padding: 6px;
  overflow-y: auto;
  flex: 1;
}

/* Left Panel */
.left-panel {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Register display */
.reg-section {
  margin-bottom: 4px;
}

.reg-section-title {
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 2px;
  padding: 2px 0;
  border-bottom: 1px solid var(--border);
}

.reg-row {
  display: flex;
  align-items: center;
  padding: 1px 0;
  gap: 4px;
}

.reg-name {
  color: var(--amber);
  width: 24px;
  text-align: right;
  font-size: 11px;
  font-weight: 600;
}

.reg-value {
  color: var(--green);
  font-size: 12px;
  font-weight: 500;
  transition: color 0.3s, text-shadow 0.3s;
  min-width: 40px;
}

.reg-value.changed {
  color: var(--yellow);
  text-shadow: 0 0 8px var(--yellow);
}

.reg-sub {
  color: var(--text-dim);
  font-size: 10px;
}

/* Flags */
.flags-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  padding: 4px 0;
}

.flag-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.flag-label {
  font-size: 8px;
  color: var(--text-dim);
}

.flag-led {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 700;
  border: 1px solid #333;
}

.flag-led.on {
  background: var(--green);
  color: #000;
  box-shadow: 0 0 4px var(--green);
}

.flag-led.off {
  background: #1A1A1A;
  color: #444;
}

/* Stack view */
.stack-entry {
  display: flex;
  gap: 8px;
  padding: 1px 4px;
  font-size: 10px;
}

.stack-entry.current {
  background: rgba(0,255,0,0.1);
  color: var(--green);
}

.stack-addr { color: var(--text-dim); }
.stack-val { color: var(--amber); }

/* Center Panel */
.center-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* CGA Display */
.cga-container {
  position: relative;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}

.cga-wrapper {
  position: relative;
  line-height: 0;
}

.cga-canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
}

.cga-scanlines {
  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;
}

.cga-crt {
  border-radius: 8px;
  box-shadow: 
    inset 0 0 30px rgba(0,0,0,0.5),
    0 0 20px rgba(0,255,0,0.05);
  overflow: hidden;
}

/* Disassembly */
.disasm-view {
  flex: 1;
  overflow-y: auto;
  font-size: 11px;
}

.disasm-line {
  display: flex;
  padding: 1px 6px;
  gap: 8px;
  white-space: nowrap;
}

.disasm-line.current {
  background: rgba(0,255,0,0.12);
  color: var(--green);
}

.disasm-line.breakpoint {
  background: rgba(255,0,0,0.12);
}

.disasm-addr { color: var(--text-dim); min-width: 90px; }
.disasm-bytes { color: #666; min-width: 80px; }
.disasm-mnem { color: var(--cyan); min-width: 50px; font-weight: 600; }
.disasm-ops { color: var(--amber); }

/* Right Panel */
.right-panel {
  width: 340px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

/* Memory Inspector */
.mem-controls {
  display: flex;
  gap: 4px;
  padding: 4px;
  align-items: center;
}

.mem-input {
  background: #1A1A1A;
  border: 1px solid var(--border-light);
  color: var(--green);
  font-family: inherit;
  font-size: 11px;
  padding: 2px 6px;
  width: 80px;
  outline: none;
}

.mem-input:focus { border-color: var(--green); }

.hex-dump {
  font-size: 10px;
  overflow-y: auto;
  flex: 1;
  padding: 0 4px;
}

.hex-row {
  display: flex;
  white-space: nowrap;
  padding: 0 2px;
  line-height: 1.5;
}

.hex-row:hover { background: rgba(255,255,255,0.03); }

.hex-addr { color: var(--text-dim); min-width: 55px; }
.hex-bytes { color: var(--green); }
.hex-ascii { color: var(--amber); margin-left: 4px; }

.hex-byte {
  cursor: pointer;
  padding: 0 1px;
}

.hex-byte:hover {
  background: rgba(0,255,0,0.15);
}

.hex-byte.highlight-video { color: var(--magenta); }
.hex-byte.highlight-ivt { color: var(--cyan); }

/* I/O Log */
.io-log {
  font-size: 10px;
  overflow-y: auto;
  max-height: 120px;
  padding: 4px;
}

.io-entry { color: var(--text-dim); }
.io-entry .io-dir { color: var(--cyan); }
.io-entry .io-port { color: var(--amber); }
.io-entry .io-val { color: var(--green); }

/* Breakpoints */
.bp-controls {
  display: flex;
  gap: 4px;
  padding: 4px;
}

.bp-list {
  padding: 0 4px;
}

.bp-entry {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 1px 0;
  font-size: 10px;
}

.bp-entry .bp-addr { color: var(--red); }
.bp-remove {
  background: none;
  border: none;
  color: var(--red);
  cursor: pointer;
  font-size: 10px;
  font-family: inherit;
}

/* Bottom Console */
.console-area {
  border-top: 1px solid var(--border);
  background: #0A0A0A;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

.console-toggle {
  padding: 2px 8px;
  font-size: 9px;
  color: var(--text-dim);
  cursor: pointer;
  text-align: center;
  background: #1A1A1A;
  border-bottom: 1px solid var(--border);
}

.console-toggle:hover { color: var(--text); }

.console-output {
  padding: 4px 8px;
  overflow-y: auto;
  font-size: 11px;
  max-height: 120px;
  color: var(--green);
}

.console-input-row {
  display: flex;
  align-items: center;
  padding: 2px 8px;
  border-top: 1px solid var(--border);
}

.console-prompt {
  color: var(--green);
  margin-right: 4px;
}

.console-input {
  background: transparent;
  border: none;
  color: var(--green);
  font-family: inherit;
  font-size: 11px;
  flex: 1;
  outline: none;
}

/* Demo selector */
.demo-select {
  background: #333;
  color: var(--text);
  border: 1px solid var(--border-light);
  font-family: inherit;
  font-size: 11px;
  padding: 2px 4px;
  cursor: pointer;
  outline: none;
}

.demo-select:hover { background: #444; }

/* Footer */
.footer {
  padding: 2px 8px;
  text-align: center;
  font-size: 9px;
  color: var(--text-dim);
  background: #111;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.footer a {
  color: var(--cyan);
  text-decoration: none;
}

.footer a:hover { text-decoration: underline; }

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #444;
}

/* Hidden file input */
.hidden-input {
  display: none;
}

/* Tab system for mobile */
@media (max-width: 1024px) {
  .left-panel, .right-panel {
    display: none;
  }
  .left-panel.active, .right-panel.active {
    display: flex;
    position: absolute;
    top: 36px;
    bottom: 0;
    z-index: 10;
    background: var(--bg-panel);
  }
  .left-panel.active { left: 0; }
  .right-panel.active { right: 0; }
}