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

:root {
  --bg: #0000AA;
  --bg-dark: #000080;
  --bg-darker: #000055;
  --text: #FFFFFF;
  --text-dim: #AAAAAA;
  --text-yellow: #FFFF55;
  --text-cyan: #55FFFF;
  --text-green: #55FF55;
  --text-magenta: #FF55FF;
  --border: #55FFFF;
  --highlight: #0000CC;
  --row-alt: #000066;
  --titlebar-bg: #AAAAAA;
  --titlebar-text: #000080;
  --glow: 0 0 8px rgba(85,255,255,0.4);
}

body.dark-theme {
  --bg: #0C0C0C;
  --bg-dark: #1A1A1A;
  --bg-darker: #000000;
  --text: #00FF00;
  --text-dim: #008800;
  --text-yellow: #FFFF00;
  --text-cyan: #00FFFF;
  --text-green: #00FF00;
  --text-magenta: #FF00FF;
  --border: #00FF00;
  --highlight: #1A1A1A;
  --row-alt: #111111;
  --titlebar-bg: #333333;
  --titlebar-text: #00FF00;
  --glow: 0 0 8px rgba(0,255,0,0.4);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'VT323', 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 16px;
  line-height: 1.3;
  min-height: 100vh;
  overflow-x: hidden;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 8px 8px;
}

/* Title Bar */
#titlebar {
  background: var(--titlebar-bg);
  color: var(--titlebar-text);
  padding: 4px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 1px;
}
.title-buttons span {
  display: inline-block;
  width: 20px;
  text-align: center;
  cursor: pointer;
  margin-left: 2px;
}
.title-buttons span:hover {
  background: var(--bg);
  color: var(--text);
}

#menubar {
  background: var(--bg-dark);
  padding: 2px 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 12px;
  font-size: 16px;
}
.menu-item {
  cursor: pointer;
  color: var(--text-yellow);
  text-shadow: var(--glow);
}
.menu-item:hover { color: var(--text-cyan); }
.menu-spacer { flex: 1; }

/* Drop Zone */
#dropzone {
  margin: 16px 0;
  border: 2px dashed var(--border);
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: background 0.15s;
  position: relative;
}
#dropzone:hover, #dropzone.drag-over {
  background: var(--highlight);
}
#dropzone.drag-over {
  border-color: var(--text-yellow);
}
.dropzone-title {
  color: var(--text-cyan);
  font-size: 18px;
  text-shadow: var(--glow);
  line-height: 1.1;
}
.dropzone-text {
  font-size: 22px;
  color: var(--text-yellow);
  margin-top: 8px;
  text-shadow: var(--glow);
}
.dropzone-text-sub {
  font-size: 16px;
  color: var(--text-dim);
}
.blink-cursor {
  display: inline-block;
  animation: blink 1s step-end infinite;
  color: var(--text-cyan);
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}
#dropzone.has-image {
  padding: 8px;
  border-style: solid;
}
#dropzone.has-image #dropzone-inner {
  display: none;
}

/* Panels */
.hidden { display: none !important; }

.panel-title {
  color: var(--text-cyan);
  font-size: 15px;
  text-shadow: var(--glow);
  white-space: nowrap;
  overflow: hidden;
}

/* Hex Dump */
.hex-dump {
  background: var(--bg-darker);
  padding: 8px;
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  overflow-x: auto;
}
.hex-dump .hex-row {
  white-space: pre;
}
.hex-dump .hex-row:nth-child(even) {
  background: var(--row-alt);
}
.hex-dump .hex-addr { color: var(--text-yellow); }
.hex-dump .hex-bytes { color: var(--text); }
.hex-dump .hex-ascii { color: var(--text-green); }
.hex-dump .hex-mz { color: var(--text-magenta); font-weight: bold; }
.scrollable {
  max-height: 240px;
  overflow-y: auto;
}
.scrollable::-webkit-scrollbar { width: 12px; }
.scrollable::-webkit-scrollbar-track { background: var(--bg-darker); }
.scrollable::-webkit-scrollbar-thumb { background: var(--text-dim); }

/* Toolbar */
#toolbar {
  margin: 12px 0;
  padding: 8px;
  border: 1px solid var(--border);
  background: var(--bg-dark);
}
.toolbar-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 4px;
}
.toolbar-row:last-child { margin-bottom: 0; }

.dos-btn {
  background: var(--bg-dark);
  color: var(--text-yellow);
  border: 1px solid var(--text-dim);
  padding: 4px 10px;
  font-family: inherit;
  font-size: 15px;
  cursor: pointer;
  text-shadow: var(--glow);
}
.dos-btn:hover {
  background: var(--highlight);
  color: var(--text-cyan);
  border-color: var(--text-cyan);
}
.dos-btn.active-toggle {
  color: var(--text-green);
  border-color: var(--text-green);
}

.dos-select {
  background: var(--bg-darker);
  color: var(--text);
  border: 1px solid var(--text-dim);
  padding: 4px 6px;
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
}
.dos-select:focus { outline: 1px solid var(--text-cyan); }

.dos-label {
  color: var(--text-dim);
  font-size: 15px;
}

.dos-range {
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-darker);
  border: 1px solid var(--text-dim);
  height: 8px;
  flex: 1;
  max-width: 300px;
  cursor: pointer;
}
.dos-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 20px;
  background: var(--text-cyan);
  border: none;
  cursor: pointer;
}

/* Canvas Grid */
#canvas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin: 16px 0;
}

.canvas-cell {
  border: 1px solid var(--border);
  padding: 4px;
  background: var(--bg-dark);
  cursor: pointer;
  transition: border-color 0.2s;
}
.canvas-cell:hover {
  border-color: var(--text-yellow);
}
.canvas-cell.selected {
  border-color: var(--text-yellow);
  border-width: 2px;
}

.cell-title {
  color: var(--text-cyan);
  font-size: 14px;
  text-shadow: var(--glow);
  white-space: nowrap;
  overflow: hidden;
}

.preview-canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
}

.cell-info {
  color: var(--text-dim);
  font-size: 12px;
  padding: 2px 4px;
  line-height: 1.4;
}

.cell-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.export-btn {
  font-size: 13px;
  padding: 2px 8px;
}

/* Hex Tabs */
.hex-tabs {
  display: flex;
  gap: 4px;
  margin: 4px 0;
}
.hex-tab {
  background: var(--bg-darker);
  color: var(--text-dim);
  border: 1px solid var(--text-dim);
  padding: 2px 10px;
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
}
.hex-tab.active {
  background: var(--bg-dark);
  color: var(--text-yellow);
  border-color: var(--text-yellow);
}
.hex-tab:hover {
  color: var(--text-cyan);
}

/* Footer */
#footer {
  margin-top: 16px;
  padding: 4px 8px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  color: var(--text-dim);
  font-size: 15px;
}
#footer a {
  color: var(--text-cyan);
  text-decoration: none;
  text-shadow: var(--glow);
}
#footer a:hover {
  color: var(--text-yellow);
}
.footer-right {
  color: var(--text-dim);
}

/* EXE Header Panel */
#exe-header-panel {
  margin: 12px 0;
}

#hex-viewer-panel {
  margin: 12px 0;
}

/* Responsive */
@media (max-width: 768px) {
  #canvas-grid {
    grid-template-columns: 1fr;
  }
  #titlebar {
    font-size: 13px;
  }
  .dropzone-text {
    font-size: 18px;
  }
  .hex-dump {
    font-size: 11px;
  }
}

/* CRT scanline overlay for 24-bit */
.scanline-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.15) 2px,
    rgba(0,0,0,0.15) 4px
  );
}

/* Loading indicator */
.processing {
  color: var(--text-yellow);
  text-align: center;
  padding: 20px;
  font-size: 20px;
}