:root {
  --bg-deep: #08090d;
  --bg-main: #0e1117;
  --bg-panel: #161b22;
  --bg-card: #1c2129;
  --bg-input: #0d1117;
  --teal: #39d98a;
  --teal-dim: #1b7a45;
  --amber: #ffab00;
  --amber-dim: #b37800;
  --red: #ff6b6b;
  --blue: #58a6ff;
  --purple: #bc8cff;
  --text: #c9d1d9;
  --text-dim: #6e7681;
  --text-bright: #f0f3f6;
  --border: #21262d;
  --border-bright: #363b42;
}

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

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

/* Subtle grid background */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(57, 217, 138, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 217, 138, 0.015) 1px, transparent 1px);
  background-size: 40px 40px;
}

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

h1 {
  font-family: 'VT323', monospace;
  font-size: 2.8rem;
  letter-spacing: 3px;
  color: var(--teal);
  text-shadow: 0 0 40px rgba(57, 217, 138, 0.2);
}

.subtitle {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 4px;
}

.header {
  text-align: center;
  padding: 24px 0 16px;
}

.badge {
  display: inline-block;
  font-size: 0.65rem;
  padding: 2px 8px;
  border: 1px solid var(--border-bright);
  color: var(--text-dim);
  border-radius: 3px;
  margin: 0 3px;
}

.badge.active {
  border-color: var(--teal-dim);
  color: var(--teal);
  background: rgba(57, 217, 138, 0.08);
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border-bright);
  border-radius: 8px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-panel);
  position: relative;
}

.drop-zone:hover, .drop-zone.dragging {
  border-color: var(--teal);
  background: rgba(57, 217, 138, 0.04);
  box-shadow: 0 0 40px rgba(57, 217, 138, 0.06);
}

.drop-zone .icon {
  font-size: 3rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.drop-zone .label {
  font-family: 'VT323', monospace;
  font-size: 1.4rem;
  color: var(--text);
  margin-bottom: 8px;
}

.drop-zone .hint {
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* Panels */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.panel-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0,0,0,0.2);
}

.panel-header h2 {
  font-family: 'VT323', monospace;
  font-size: 1.1rem;
  color: var(--teal);
  letter-spacing: 1px;
}

.panel-body {
  padding: 16px;
}

/* Canvas display */
.canvas-wrap {
  background: #000;
  border: 2px solid var(--border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  position: relative;
  overflow: hidden;
}

.canvas-wrap canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  display: block;
  max-width: 100%;
  max-height: 480px;
}

.canvas-overlay {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 0.65rem;
  color: var(--teal);
  background: rgba(0,0,0,0.7);
  padding: 3px 8px;
  border-radius: 3px;
  pointer-events: none;
  font-family: 'JetBrains Mono', monospace;
}

/* Transport controls */
.transport {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.transport-btn {
  font-family: 'VT323', monospace;
  font-size: 1.2rem;
  width: 40px;
  height: 36px;
  border: 1px solid var(--border-bright);
  background: var(--bg-panel);
  color: var(--text);
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.1s;
}

.transport-btn:hover {
  border-color: var(--teal);
  color: var(--teal);
  background: rgba(57, 217, 138, 0.08);
}

.transport-btn:active {
  transform: scale(0.95);
}

.transport-btn.active {
  border-color: var(--teal);
  color: var(--bg-deep);
  background: var(--teal);
}

.seek-bar {
  flex: 1;
  min-width: 100px;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  outline: none;
  border: 1px solid var(--border);
}

.seek-bar::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--teal);
  border-radius: 3px;
  cursor: pointer;
}

.seek-bar::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--teal);
  border-radius: 3px;
  cursor: pointer;
  border: none;
}

.frame-counter {
  font-size: 0.75rem;
  color: var(--amber);
  white-space: nowrap;
  min-width: 110px;
  text-align: right;
}

/* Speed selector */
.speed-select {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 6px;
  cursor: pointer;
}

/* Info table */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1px;
  background: var(--border);
}

.info-cell {
  background: var(--bg-panel);
  padding: 8px 12px;
}

.info-cell .label {
  font-size: 0.6rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 2px;
}

.info-cell .value {
  font-family: 'VT323', monospace;
  font-size: 1.1rem;
  color: var(--amber);
}

/* Debug / hex dump */
.hex-dump {
  font-size: 0.65rem;
  line-height: 1.6;
  color: var(--text-dim);
  background: var(--bg-input);
  padding: 12px;
  border-radius: 4px;
  max-height: 200px;
  overflow-y: auto;
  white-space: pre;
  border: 1px solid var(--border);
}

.hex-dump .offset { color: var(--text-dim); }
.hex-dump .byte { color: var(--text); }
.hex-dump .ascii { color: var(--teal-dim); }

/* Log messages */
.log-area {
  font-size: 0.65rem;
  line-height: 1.8;
  max-height: 180px;
  overflow-y: auto;
  padding: 10px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.log-line { color: var(--text-dim); }
.log-line.info { color: var(--text); }
.log-line.ok { color: var(--teal); }
.log-line.warn { color: var(--amber); }
.log-line.err { color: var(--red); }

/* Toggle */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px 0;
}

.toggle-box {
  width: 16px;
  height: 16px;
  border: 1px solid var(--border-bright);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-input);
  flex-shrink: 0;
}

.toggle-box.on {
  border-color: var(--teal);
  background: var(--teal);
  color: var(--bg-deep);
}

/* Layout helpers */
.flex-row { display: flex; gap: 16px; flex-wrap: wrap; }
.flex-col { display: flex; flex-direction: column; gap: 16px; }
.flex-1 { flex: 1; min-width: 0; }
.mt { margin-top: 16px; }
.mb { margin-bottom: 16px; }
.gap-sm { gap: 8px; }

/* Error state */
.error-box {
  background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.3);
  border-radius: 6px;
  padding: 16px;
  color: var(--red);
  font-size: 0.8rem;
  text-align: center;
}

/* Footer */
footer {
  text-align: center;
  padding: 24px 0;
  font-size: 0.65rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  margin-top: 32px;
}

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

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

/* Codebook display */
.codebook-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.cb-entry {
  width: 8px;
  height: 8px;
  border: 1px solid rgba(255,255,255,0.06);
}

.strip-info {
  font-size: 0.65rem;
  padding: 6px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  margin-bottom: 6px;
  color: var(--text-dim);
}

.strip-info span { color: var(--amber); }

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  .flex-row { flex-direction: column; }
  .transport { gap: 6px; }
  .frame-counter { min-width: auto; text-align: center; flex-basis: 100%; }
}