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

:root {
  --bg: #06080a;
  --bg-panel: #0c0f13;
  --bg-editor: #0a0d10;
  --border: #1a1f27;
  --accent: #00ff41;
  --accent-dim: #00aa2a;
  --accent-glow: rgba(0, 255, 65, 0.15);
  --amber: #ffb000;
  --amber-dim: #aa7500;
  --red: #ff3344;
  --text: #c8d0d8;
  --text-dim: #5a6570;
  --font-mono: 'Fira Code', 'Courier New', monospace;
  --font-display: 'Share Tech Mono', 'Fira Code', monospace;
}

html {
  font-size: 14px;
}

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

body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(0, 255, 65, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(255, 176, 0, 0.02) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

#app {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

/* HEADER */
#header {
  padding: 24px 0 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.title {
  font-family: var(--font-display);
  font-size: 2.4rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent-glow), 0 0 40px rgba(0,255,65,0.08);
  font-weight: 400;
}

.title-dim {
  color: var(--text-dim);
  font-size: 1.6rem;
}

.title-version {
  color: var(--amber);
  font-size: 1.2rem;
  font-weight: 300;
}

.subtitle {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  margin-top: 4px;
  font-weight: 300;
}

.subtitle-credit {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  margin-top: 2px;
  font-weight: 300;
  opacity: 0.6;
}

/* MAIN */
#main {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  align-items: flex-start;
}

/* CANVAS */
.canvas-section {
  flex-shrink: 0;
}

.canvas-wrapper {
  position: relative;
  width: 512px;
  height: 512px;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  background: #000;
  box-shadow: 
    0 0 30px rgba(0, 255, 65, 0.06),
    0 0 60px rgba(0, 255, 65, 0.03),
    inset 0 0 80px rgba(0, 0, 0, 0.5);
}

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

.scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 1px,
    rgba(0, 0, 0, 0.12) 1px,
    rgba(0, 0, 0, 0.12) 2px
  );
  pointer-events: none;
}

#fps-counter {
  position: absolute;
  top: 8px;
  right: 10px;
  font-size: 0.7rem;
  color: var(--accent-dim);
  font-family: var(--font-mono);
  text-shadow: 0 0 4px rgba(0,255,65,0.3);
  pointer-events: none;
  z-index: 2;
}

#error-overlay {
  position: absolute;
  bottom: 8px;
  left: 8px;
  right: 8px;
  font-size: 0.7rem;
  color: var(--red);
  font-family: var(--font-mono);
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.3s;
  text-shadow: 0 0 6px rgba(255,51,68,0.4);
  background: rgba(0,0,0,0.7);
  padding: 4px 8px;
  border-radius: 2px;
}

#error-overlay.visible {
  opacity: 1;
}

/* CONTROLS SECTION */
.controls-section {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* PRESETS */
.presets-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.presets-label {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.presets-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.preset-chip {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.preset-chip:hover {
  background: rgba(255, 176, 0, 0.1);
  border-color: var(--amber-dim);
  box-shadow: 0 0 8px rgba(255,176,0,0.15);
}

.preset-chip .preset-name {
  color: var(--accent);
  font-weight: 600;
}

.preset-chip.preset-audio {
  border-color: #553300;
}

.preset-chip.preset-audio:hover {
  background: rgba(255, 100, 0, 0.1);
  border-color: #884400;
}

.preset-chip .preset-name-audio {
  color: var(--amber);
}

.canvas-hint {
  font-size: 0.6rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 6px;
  letter-spacing: 0.08em;
  opacity: 0.6;
}

/* EDITOR */
.editor-wrapper {
  background: var(--bg-editor);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.editor-header {
  display: flex;
  justify-content: space-between;
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
}

.editor-label {
  color: var(--text-dim);
}

.char-count {
  color: var(--amber-dim);
}

#editor {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  padding: 12px;
  resize: vertical;
  min-height: 80px;
  outline: none;
  caret-color: var(--accent);
  line-height: 1.5;
  text-shadow: 0 0 8px var(--accent-glow);
}

#editor::placeholder {
  color: var(--text-dim);
  text-shadow: none;
}

/* CONTROL BAR */
.control-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.ctrl-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-panel);
  color: var(--text);
}

.ctrl-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-run {
  color: var(--accent);
  border-color: var(--accent-dim);
}
.btn-run:hover:not(:disabled) {
  background: rgba(0,255,65,0.1);
  box-shadow: 0 0 12px var(--accent-glow);
}

.btn-pause {
  color: var(--amber);
  border-color: var(--amber-dim);
}
.btn-pause:hover:not(:disabled) {
  background: rgba(255,176,0,0.1);
  box-shadow: 0 0 12px rgba(255,176,0,0.15);
}

.btn-stop {
  color: var(--red);
  border-color: #661122;
}
.btn-stop:hover:not(:disabled) {
  background: rgba(255,51,68,0.1);
  box-shadow: 0 0 12px rgba(255,51,68,0.15);
}

.btn-audio {
  color: var(--text-dim);
  border-color: var(--border);
}
.btn-audio.active {
  color: var(--accent);
  border-color: var(--accent-dim);
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.speed-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

#speed-slider {
  -webkit-appearance: none;
  width: 80px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

#speed-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 6px var(--accent-glow);
}

#speed-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

#speed-value {
  font-size: 0.7rem;
  color: var(--amber);
  min-width: 30px;
}

/* PANELS */
.panels-row {
  display: flex;
  gap: 16px;
  padding-bottom: 16px;
}

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

.panel-toggle {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 10px 14px;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s;
}

.panel-toggle:hover {
  color: var(--accent);
}

.panel-toggle.open {
  color: var(--accent);
  border-bottom: 1px solid var(--border);
}

.panel-content {
  padding: 12px 14px;
  max-height: 300px;
  overflow-y: auto;
}

.stack-display {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--amber);
}

.stack-display .stack-item {
  display: flex;
  gap: 12px;
}

.stack-display .stack-idx {
  color: var(--text-dim);
  min-width: 24px;
  text-align: right;
}

.ref-display {
  font-size: 0.7rem;
  line-height: 1.7;
}

.ref-category {
  margin-bottom: 10px;
}

.ref-category-title {
  color: var(--amber);
  font-weight: 600;
  margin-bottom: 4px;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.ref-item {
  color: var(--text-dim);
}

.ref-item .ref-op {
  color: var(--accent);
  font-weight: 600;
  display: inline-block;
  min-width: 24px;
}

/* SPEC DISPLAY */
.spec-display {
  font-size: 0.72rem;
  line-height: 1.8;
}

.spec-row {
  display: flex;
  gap: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  padding: 2px 0;
}

.spec-key {
  color: var(--amber);
  min-width: 130px;
  font-weight: 500;
}

.spec-val {
  color: var(--text);
  font-weight: 300;
}

/* PANELS ROW - 3 panels */
.panels-row {
  display: flex;
  gap: 16px;
  padding-bottom: 16px;
  flex-wrap: wrap;
}

.panel {
  flex: 1;
  min-width: 280px;
}

/* FOOTER */
#footer {
  padding: 16px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.68rem;
  color: var(--text-dim);
}

#footer a {
  color: var(--accent-dim);
  text-decoration: none;
}

#footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer-sep {
  margin: 0 8px;
  opacity: 0.4;
}

/* SCROLLBAR */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  #main {
    flex-direction: column;
    align-items: center;
  }
  .canvas-wrapper, #canvas {
    width: min(90vw, 512px);
    height: min(90vw, 512px);
  }
  .controls-section {
    width: 100%;
  }
  .panels-row {
    flex-direction: column;
  }
}

@media (max-width: 540px) {
  .canvas-wrapper, #canvas {
    width: calc(100vw - 32px);
    height: calc(100vw - 32px);
  }
  .control-bar {
    justify-content: center;
  }
  .speed-control {
    margin-left: 0;
    width: 100%;
    justify-content: center;
  }
}