:root {
  --bg-dark: #0a0a0a;
  --bg-mid: #141414;
  --bg-light: #1e1e1e;
  --border: #2a2a2a;
  --green: #33ff33;
  --green-dim: #22aa22;
  --green-glow: rgba(51, 255, 51, 0.3);
  --key-bg: #d4c5a9;
  --key-text: #3a2f1a;
  --key-border: #a89878;
  --red: #ff4444;
  --yellow: #ffcc00;
  --text: #cccccc;
  --text-dim: #777777;
}

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

body {
  background: var(--bg-dark);
  color: var(--text);
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

header {
  text-align: center;
  padding: 16px 0 8px;
}

header h1 {
  font-family: 'VT323', monospace;
  font-size: 2.2rem;
  color: var(--green);
  text-shadow: 0 0 10px var(--green-glow), 0 0 20px rgba(51,255,51,0.15);
  letter-spacing: 2px;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 2px;
}

#status-bar {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.status-pill {
  font-size: 0.75rem;
  padding: 3px 10px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-dim);
}

.status-pill.running {
  color: var(--green);
  border-color: var(--green-dim);
  box-shadow: 0 0 6px var(--green-glow);
}

.status-pill.halted {
  color: var(--red);
  border-color: #662222;
}

/* CRT Display */
#crt-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 16px 0;
}

#crt-bezel {
  background: linear-gradient(145deg, #2a2a2a 0%, #1a1a1a 50%, #0f0f0f 100%);
  padding: 28px 32px 32px;
  border-radius: 20px;
  border: 2px solid #333;
  box-shadow: 0 4px 20px rgba(0,0,0,0.8), inset 0 1px 0 rgba(255,255,255,0.05);
}

#crt-screen {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 0 40px var(--green-glow), 0 0 80px rgba(51,255,51,0.08), inset 0 0 30px rgba(0,0,0,0.5);
  border: 1px solid #222;
}

#display {
  display: block;
  width: 512px;
  height: 512px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

#display.full-view {
  /* no crop */
}

#scanlines {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 1px,
    rgba(0,0,0,0.15) 1px,
    rgba(0,0,0,0.15) 2px
  );
  z-index: 2;
}

#crt-glow {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  border-radius: 8px;
  box-shadow: inset 0 0 60px rgba(51,255,51,0.05);
  z-index: 3;
}

#crt-label {
  text-align: center;
  font-size: 0.65rem;
  color: #555;
  margin-top: 8px;
  letter-spacing: 3px;
}

/* Controls */
#controls-panel {
  background: var(--bg-mid);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

.control-section {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.control-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.control-section h3 {
  font-family: 'VT323', monospace;
  font-size: 1.1rem;
  color: var(--green);
  margin-bottom: 8px;
}

.rom-slots {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 8px;
}

.rom-slot {
  background: var(--bg-light);
  padding: 8px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.rom-slot label {
  display: block;
  font-size: 0.8rem;
  color: var(--text);
  margin-bottom: 4px;
}

.rom-slot small {
  color: var(--text-dim);
}

.rom-input {
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--text);
  width: 100%;
  margin-bottom: 4px;
}

.rom-input::file-selector-button {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem;
  padding: 2px 8px;
  background: var(--bg-light);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

.rom-status {
  font-size: 0.75rem;
  display: block;
}

#drop-zone {
  border: 2px dashed var(--border);
  border-radius: 6px;
  padding: 16px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  margin-top: 8px;
  transition: border-color 0.2s, background 0.2s;
}

#drop-zone.dragover {
  border-color: var(--green);
  background: rgba(51,255,51,0.03);
}

#drop-zone small {
  font-size: 0.7rem;
}

.button-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.btn {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  background: linear-gradient(180deg, #2a2a2a, #1a1a1a);
  color: var(--text);
  transition: all 0.15s;
}

.btn:hover {
  filter: brightness(1.3);
}

.btn:active {
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.5);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-power {
  background: linear-gradient(180deg, #225522, #113311);
  color: var(--green);
  border-color: var(--green-dim);
  font-weight: bold;
}

.btn-reset {
  background: linear-gradient(180deg, #554400, #332800);
  color: var(--yellow);
  border-color: #887700;
}

.btn-break {
  background: linear-gradient(180deg, #552222, #331111);
  color: var(--red);
  border-color: #882222;
}

.btn-pause {
  background: linear-gradient(180deg, #333355, #222244);
  color: #8888ff;
  border-color: #555588;
}

.btn-step {
  background: linear-gradient(180deg, #334433, #223322);
  color: #88cc88;
  border-color: #446644;
}

.btn-small {
  font-size: 0.7rem;
  padding: 3px 8px;
}

.btn-tiny {
  font-size: 0.65rem;
  padding: 2px 6px;
}

.btn-cassette {
  background: linear-gradient(180deg, #443322, #2a1a0a);
  color: #ccaa77;
  border-color: #665533;
}

.speed-row, .cassette-row, .audio-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.8rem;
}

select, input[type="text"] {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  padding: 3px 6px;
  background: var(--bg-dark);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
}

.toggle-label {
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.cassette-led {
  font-size: 1.2rem;
  color: #555;
  transition: color 0.2s;
}

.cassette-led.active {
  color: var(--red);
  text-shadow: 0 0 6px var(--red);
  animation: blink 0.5s infinite;
}

@keyframes blink {
  50% { opacity: 0.3; }
}

input[type="range"] {
  width: 100px;
  accent-color: var(--green);
}

/* On-screen Keyboard */
#keyboard-container {
  background: var(--bg-mid);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

#keyboard-container h3 {
  font-family: 'VT323', monospace;
  font-size: 1.1rem;
  color: var(--green);
  margin-bottom: 8px;
}

#keyboard {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.kb-row {
  display: flex;
  gap: 3px;
}

.key {
  font-family: 'VT323', monospace;
  font-size: 0.85rem;
  min-width: 36px;
  height: 34px;
  padding: 0 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #e0d4b8 0%, #c8b898 100%);
  color: var(--key-text);
  border: 1px solid var(--key-border);
  border-bottom: 3px solid #8a7a5a;
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  transition: all 0.08s;
  white-space: nowrap;
}

.key:hover {
  filter: brightness(1.1);
}

.key:active, .key.pressed {
  transform: translateY(2px);
  border-bottom-width: 1px;
  background: linear-gradient(180deg, #b8a888 0%, #a89878 100%);
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.3);
}

.key.wide {
  min-width: 64px;
}

.key.wider {
  min-width: 80px;
}

.key.space {
  min-width: 320px;
}

.key.break-key {
  background: linear-gradient(180deg, #cc4444 0%, #992222 100%);
  color: #fff;
  border-color: #882222;
  border-bottom-color: #661111;
}

.key.shift-key, .key.ctrl-key {
  background: linear-gradient(180deg, #c8c0a8 0%, #b0a888 100%);
}

/* Debug Panel */
#debug-section {
  margin-bottom: 12px;
}

#debug-panel {
  background: var(--bg-mid);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-top: 8px;
}

.debug-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 12px;
}

.debug-col h4 {
  font-family: 'VT323', monospace;
  color: var(--green);
  font-size: 1rem;
  margin-bottom: 6px;
}

.reg-row {
  display: flex;
  gap: 8px;
  margin-bottom: 2px;
  font-size: 0.85rem;
}

.reg-name {
  color: var(--text-dim);
  min-width: 30px;
}

.reg-val {
  color: var(--green);
  font-weight: bold;
}

#flag-indicators {
  display: flex;
  gap: 4px;
  margin: 6px 0;
}

.flag {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: bold;
  border-radius: 3px;
  background: var(--bg-dark);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.flag.lit {
  color: var(--green);
  background: rgba(51,255,51,0.1);
  border-color: var(--green-dim);
  box-shadow: 0 0 4px var(--green-glow);
}

.flag.dim {
  opacity: 0.3;
}

#disasm, #instr-count {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 4px;
}

#current-instr {
  color: var(--yellow);
}

.mem-controls {
  display: flex;
  gap: 4px;
  margin-bottom: 6px;
}

.mem-controls input {
  width: 70px;
}

.mem-quickjump {
  display: flex;
  gap: 3px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

#mem-dump {
  font-size: 0.6rem;
  line-height: 1.3;
  color: var(--green-dim);
  background: var(--bg-dark);
  padding: 6px;
  border-radius: 4px;
  overflow-x: auto;
  max-height: 260px;
  overflow-y: auto;
  border: 1px solid var(--border);
}

.bp-controls {
  display: flex;
  gap: 4px;
  margin-bottom: 6px;
}

.bp-controls input {
  width: 70px;
}

#bp-list {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.bp-item {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 2px;
}

.bp-item button {
  font-size: 0.6rem;
  padding: 1px 4px;
  cursor: pointer;
  background: var(--bg-dark);
  color: var(--red);
  border: 1px solid #662222;
  border-radius: 2px;
}

.hidden { display: none !important; }

#keymap-panel {
  margin-top: 8px;
  background: var(--bg-dark);
  padding: 8px;
  border-radius: 4px;
}

#keymap-panel table {
  font-size: 0.75rem;
  border-collapse: collapse;
}

#keymap-panel th, #keymap-panel td {
  padding: 2px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

#keymap-panel th {
  color: var(--green);
}

/* Footer */
footer {
  text-align: center;
  padding: 16px 0;
  font-size: 0.7rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

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

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

/* CRT power-on animation */
@keyframes crt-warmup {
  0% { filter: brightness(0) blur(20px); transform: scaleY(0.01); }
  30% { filter: brightness(0.3) blur(5px); transform: scaleY(0.02); }
  60% { filter: brightness(0.7) blur(2px); transform: scaleY(1); }
  100% { filter: brightness(1) blur(0); transform: scaleY(1); }
}

#display.warming-up {
  animation: crt-warmup 0.8s ease-out;
}

/* Responsive */
@media (max-width: 600px) {
  #display {
    width: 320px;
    height: 320px;
  }

  .key {
    min-width: 26px;
    height: 28px;
    font-size: 0.7rem;
  }

  .key.wide { min-width: 44px; }
  .key.wider { min-width: 54px; }
  .key.space { min-width: 200px; }

  .debug-grid {
    grid-template-columns: 1fr;
  }

  #crt-bezel {
    padding: 16px 12px 20px;
  }
}