:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #12122a;
  --bg-panel: #161638;
  --bg-input: #0d0d1a;
  --border: #2a2a5a;
  --green: #33ff88;
  --amber: #ffaa00;
  --cyan: #00eeff;
  --red: #ff4466;
  --text: #c8c8e0;
  --text-dim: #666688;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --font-pixel: 'Press Start 2P', monospace;
}

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

body {
  background: var(--bg-primary);
  color: var(--text);
  font-family: var(--font-mono);
  min-height: 100vh;
  overflow-x: hidden;
}

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

.header {
  background: linear-gradient(180deg, #1a1a3e 0%, var(--bg-primary) 100%);
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header h1 {
  font-family: var(--font-pixel);
  font-size: 14px;
  color: var(--green);
  text-shadow: 0 0 20px rgba(51,255,136,0.4);
  letter-spacing: 2px;
}

.header .subtitle {
  font-size: 10px;
  color: var(--text-dim);
  font-style: italic;
}

.header-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.demo-select {
  background: var(--bg-input);
  color: var(--cyan);
  border: 1px solid var(--border);
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  border-radius: 4px;
  cursor: pointer;
}

.demo-select:focus { outline: 1px solid var(--cyan); }

.main-layout {
  display: grid;
  grid-template-columns: 1fr 360px 320px;
  flex: 1;
  gap: 1px;
  background: var(--border);
  min-height: 0;
}

.panel {
  background: var(--bg-secondary);
  padding: 12px;
  overflow: auto;
  min-height: 0;
}

.panel-title {
  font-family: var(--font-pixel);
  font-size: 9px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

/* File Upload */
.file-drop {
  border: 2px dashed var(--border);
  border-radius: 6px;
  padding: 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 10px;
  font-size: 11px;
  color: var(--text-dim);
}

.file-drop:hover, .file-drop.dragover {
  border-color: var(--cyan);
  background: rgba(0,238,255,0.05);
  color: var(--cyan);
}

.file-drop input { display: none; }

/* Code Editor */
.editor-wrap {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 200px;
}

.code-editor {
  width: 100%;
  flex: 1;
  background: var(--bg-input);
  color: var(--green);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 10px 10px 48px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  resize: none;
  outline: none;
  tab-size: 8;
  min-height: 300px;
}

.code-editor:focus {
  border-color: var(--green);
  box-shadow: 0 0 8px rgba(51,255,136,0.15);
}

.line-numbers {
  position: absolute;
  left: 1px;
  top: 1px;
  bottom: 1px;
  width: 38px;
  background: #0a0a16;
  border-right: 1px solid var(--border);
  border-radius: 4px 0 0 4px;
  padding: 10px 4px;
  font-size: 11px;
  line-height: 1.6;
  color: var(--text-dim);
  text-align: right;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
}

.asm-messages {
  margin-top: 8px;
  padding: 6px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 11px;
  min-height: 24px;
  max-height: 60px;
  overflow-y: auto;
}

.asm-messages.success { color: var(--green); }
.asm-messages.error { color: var(--red); }

/* Display */
.display-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.crt-bezel {
  background: #222;
  border-radius: 16px;
  padding: 12px;
  box-shadow: inset 0 0 30px rgba(0,0,0,0.8), 0 0 20px rgba(0,0,0,0.5);
  position: relative;
}

.display-canvas {
  display: block;
  border-radius: 4px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: crosshair;
}

.crt-overlay {
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  bottom: 12px;
  border-radius: 4px;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,0,0,0.15) 0px,
    rgba(0,0,0,0.15) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: multiply;
}

.palette-strip {
  display: flex;
  gap: 2px;
  margin-top: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.palette-color {
  width: 18px;
  height: 18px;
  border-radius: 2px;
  border: 1px solid var(--border);
  position: relative;
  cursor: default;
}

.palette-color::after {
  content: attr(data-label);
  position: absolute;
  bottom: -14px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 7px;
  color: var(--text-dim);
  white-space: nowrap;
}

/* Controls */
.controls-row {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 6px 14px;
  border: 2px solid;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.1s;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  top: 0;
}

.btn:active {
  top: 2px;
  box-shadow: none !important;
}

.btn-run {
  background: #0a2a0a;
  color: var(--green);
  border-color: var(--green);
  box-shadow: 0 3px 0 #1a6a1a;
}
.btn-run:hover { background: #0f3f0f; }

.btn-pause {
  background: #2a2a0a;
  color: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 3px 0 #6a5a0a;
}
.btn-pause:hover { background: #3f3f0f; }

.btn-step {
  background: #0a1a2a;
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 3px 0 #0a4a6a;
}
.btn-step:hover { background: #0f2a3f; }

.btn-reset {
  background: #2a0a0a;
  color: var(--red);
  border-color: var(--red);
  box-shadow: 0 3px 0 #6a1a1a;
}
.btn-reset:hover { background: #3f0f0f; }

.speed-control {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  font-size: 10px;
  color: var(--text-dim);
}

.speed-slider {
  -webkit-appearance: none;
  width: 140px;
  height: 6px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  outline: none;
}

.speed-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--cyan);
  border-radius: 50%;
  cursor: pointer;
}

/* Registers */
.registers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 12px;
}

.reg-box {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
}

.reg-box.wide { grid-column: span 2; }

.reg-label {
  font-size: 9px;
  color: var(--amber);
  letter-spacing: 1px;
  margin-bottom: 2px;
}

.reg-value {
  font-size: 14px;
  font-weight: 700;
  color: var(--green);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 8px rgba(51,255,136,0.3);
}

.reg-value-dec {
  font-size: 10px;
  color: var(--text-dim);
  margin-left: 6px;
}

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

.flag {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  border: 1px solid var(--border);
  transition: all 0.15s;
}

.flag.set {
  background: rgba(51,255,136,0.2);
  color: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 6px rgba(51,255,136,0.3);
}

.flag.clear {
  background: var(--bg-input);
  color: #333;
}

/* Memory Inspector */
.mem-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}

.mem-tab {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 4px 10px;
  background: var(--bg-input);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 4px 4px 0 0;
  cursor: pointer;
  border-bottom: none;
}

.mem-tab.active {
  background: var(--bg-panel);
  color: var(--cyan);
  border-color: var(--cyan);
}

.memory-view {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 0 4px 4px 4px;
  padding: 6px;
  font-size: 10px;
  line-height: 1.5;
  max-height: 320px;
  overflow-y: auto;
  overflow-x: hidden;
}

.mem-row {
  display: flex;
  gap: 0;
  white-space: nowrap;
}

.mem-addr {
  color: var(--amber);
  width: 48px;
  flex-shrink: 0;
}

.mem-byte {
  width: 22px;
  text-align: center;
  cursor: pointer;
  color: var(--text);
  border-radius: 2px;
}

.mem-byte:hover {
  background: rgba(0,238,255,0.15);
}

.mem-byte.highlight {
  background: rgba(255,170,0,0.3);
  color: var(--amber);
  font-weight: 700;
}

.mem-byte.zp { color: #88aaff; }
.mem-byte.stack { color: #ffee88; }
.mem-byte.vram { color: #88ffaa; }
.mem-byte.special { color: #ff8888; }

/* Disassembly */
.disasm-row {
  display: flex;
  gap: 8px;
  padding: 1px 4px;
  border-radius: 2px;
}

.disasm-row.current {
  background: rgba(255,170,0,0.2);
}

.disasm-row.breakpoint {
  background: rgba(255,68,102,0.15);
  border-left: 2px solid var(--red);
}

.disasm-addr { color: var(--amber); width: 44px; }
.disasm-bytes { color: var(--text-dim); width: 80px; }
.disasm-mnemonic { color: var(--cyan); }

/* Key indicator */
.key-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 10px;
  color: var(--text-dim);
}

.key-badge {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--cyan);
  min-width: 30px;
  text-align: center;
  transition: all 0.1s;
}

.key-badge.flash {
  background: rgba(0,238,255,0.2);
  border-color: var(--cyan);
  box-shadow: 0 0 8px rgba(0,238,255,0.3);
}

/* Status bar */
.status-bar {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 6px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  flex-wrap: wrap;
  gap: 8px;
}

.status-text { color: var(--text-dim); }
.status-text.running { color: var(--green); }
.status-text.paused { color: var(--amber); }
.status-text.error { color: var(--red); }

.footer-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 10px;
}
.footer-link:hover { color: var(--cyan); }

/* CRT toggle */
.toggle-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg-input);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
}
.toggle-btn.active {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-input); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #444488; }

/* Responsive */
@media (max-width: 1100px) {
  .main-layout {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
  }
  .panel:first-child {
    grid-column: span 2;
  }
}

@media (max-width: 700px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  .panel:first-child {
    grid-column: span 1;
  }
  .header h1 { font-size: 11px; }
  .code-editor { min-height: 180px; }
}