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

:root {
  --bg-dark: #0000AA;
  --bg-darker: #000080;
  --bg-darkest: #000055;
  --text-white: #AAAAAA;
  --text-bright: #FFFFFF;
  --text-cyan: #55FFFF;
  --text-yellow: #FFFF55;
  --text-green: #55FF55;
  --text-red: #FF5555;
  --highlight: #0000FF;
  --border-color: #5555FF;
  --btn-bg: #000080;
  --btn-active: #5555FF;
  --scanline-opacity: 0.04;
}

body {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  background: var(--bg-darkest);
  color: var(--text-white);
  min-height: 100vh;
  font-size: 14px;
  overflow-x: hidden;
}

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

/* Header */
#header {
  background: var(--bg-dark);
  border-bottom: 2px solid var(--border-color);
  padding: 12px 20px;
  text-align: center;
  position: relative;
}

#header .header-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #FF5555, #FFFF55, #55FF55, #55FFFF, #5555FF, #FF55FF);
}

#header h1 {
  color: var(--text-yellow);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 2px;
  text-shadow: 2px 2px 0px #000055;
}

#header h1 .dim {
  color: var(--text-white);
}

.subtitle {
  color: var(--text-cyan);
  font-size: 12px;
  margin-top: 4px;
}

/* Main */
#main-content {
  flex: 1;
  padding: 16px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* DOS Box styling */
.dos-box {
  border: 2px solid var(--border-color);
  background: var(--bg-darker);
  position: relative;
  margin-bottom: 16px;
  box-shadow: 4px 4px 0px rgba(0,0,0,0.5);
}

.dos-box::before {
  content: '╔';
  position: absolute;
  top: -2px;
  left: -2px;
  color: var(--border-color);
  display: none;
}

.dos-box-title {
  background: var(--bg-dark);
  color: var(--text-yellow);
  padding: 4px 12px;
  font-weight: 700;
  font-size: 13px;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
  letter-spacing: 1px;
}

/* Upload */
#upload-section {
  max-width: 600px;
  margin: 0 auto 16px;
}

#drop-inner {
  padding: 24px;
  text-align: center;
  cursor: pointer;
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

#drop-inner:hover, #drop-zone.drag-over #drop-inner {
  background: rgba(85, 85, 255, 0.15);
}

#drop-prompt p {
  margin: 4px 0;
  color: var(--text-cyan);
}

#drop-prompt p:first-child,
#drop-prompt p:last-child {
  color: var(--border-color);
  font-size: 11px;
  letter-spacing: 2px;
}

#file-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

#file-info.hidden { display: none; }

#thumb-canvas {
  border: 1px solid var(--border-color);
  image-rendering: pixelated;
  background: #000;
}

#file-details {
  text-align: left;
  font-size: 12px;
  color: var(--text-green);
}

/* Controls */
.controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

@media (max-width: 800px) {
  .controls-row {
    grid-template-columns: 1fr;
  }
}

.control-inner {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-inner label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-cyan);
}

select, input[type="number"] {
  font-family: 'IBM Plex Mono', monospace;
  background: #000033;
  color: var(--text-bright);
  border: 1px solid var(--border-color);
  padding: 3px 6px;
  font-size: 12px;
}

select:focus, input:focus {
  outline: none;
  border-color: var(--text-yellow);
  box-shadow: 0 0 4px var(--text-yellow);
}

input[type="number"] {
  width: 64px;
}

.res-inputs {
  display: flex;
  align-items: center;
  gap: 6px;
}

.checkbox-label {
  font-size: 12px;
  color: var(--text-white);
  cursor: pointer;
}

input[type="checkbox"] {
  accent-color: var(--text-cyan);
}

/* Depth buttons */
#depth-buttons {
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
}

.depth-btn {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--btn-bg);
  color: var(--text-white);
  border: 1px solid var(--border-color);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  transition: all 0.15s;
  min-width: 70px;
}

.depth-btn:hover {
  background: #0000CC;
}

.depth-btn.active {
  background: var(--btn-active);
  color: var(--text-yellow);
  border-color: var(--text-yellow);
  box-shadow: 0 0 6px rgba(255, 255, 85, 0.3);
}

.depth-btn small {
  font-weight: 400;
  font-size: 10px;
  color: var(--text-cyan);
}

.depth-btn.active small {
  color: var(--text-bright);
}

/* Action Button */
.action-btn {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--bg-dark);
  color: var(--text-yellow);
  border: 2px solid var(--text-yellow);
  padding: 8px 16px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  transition: all 0.15s;
}

.action-btn:hover {
  background: var(--text-yellow);
  color: #000055;
}

.action-btn:active {
  transform: scale(0.97);
}

/* Preview Grid */
#preview-section.hidden { display: none; }

#preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  padding: 16px;
}

.preview-card {
  border: 1px solid var(--border-color);
  background: #000033;
  cursor: pointer;
  transition: border-color 0.2s;
}

.preview-card:hover {
  border-color: var(--text-yellow);
}

.preview-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  background: var(--bg-dark);
  border-bottom: 1px solid var(--border-color);
  font-size: 11px;
}

.preview-card-header .label {
  color: var(--text-yellow);
  font-weight: 700;
}

.preview-card-header .info {
  color: var(--text-cyan);
}

.preview-card-canvas-wrap {
  padding: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: #000;
}

.preview-card-canvas-wrap::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, var(--scanline-opacity)) 2px,
    rgba(0, 0, 0, var(--scanline-opacity)) 4px
  );
  pointer-events: none;
}

.preview-card canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  max-width: 100%;
  display: block;
}

.palette-row {
  display: flex;
  flex-wrap: wrap;
  padding: 4px 8px 6px;
  gap: 2px;
  background: #000022;
  border-top: 1px solid #333366;
}

.palette-swatch {
  width: 12px;
  height: 12px;
  border: 1px solid #555;
}

.preview-actions {
  display: flex;
  gap: 6px;
  padding: 6px 8px;
  border-top: 1px solid var(--border-color);
}

.small-btn {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--btn-bg);
  color: var(--text-green);
  border: 1px solid var(--border-color);
  padding: 3px 8px;
  cursor: pointer;
  font-size: 11px;
  transition: all 0.15s;
}

.small-btn:hover {
  background: var(--btn-active);
  color: var(--text-bright);
}

/* Modal */
#modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 50, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

#modal-overlay.hidden { display: none; }

#modal-content {
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
}

#modal-body {
  padding: 16px;
  display: flex;
  justify-content: center;
  background: #000;
  position: relative;
}

#modal-body::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
  pointer-events: none;
}

#modal-canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  max-width: 100%;
  max-height: 60vh;
}

#hex-dump-container {
  margin: 0 16px;
}

#hex-dump-container.hidden { display: none; }

#hex-dump {
  background: #000022;
  color: var(--text-green);
  font-size: 11px;
  padding: 8px;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  max-height: 120px;
  overflow-y: auto;
  margin: 8px 0;
}

.modal-actions {
  display: flex;
  gap: 8px;
  padding: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
#footer {
  background: var(--bg-dark);
  border-top: 2px solid var(--border-color);
  padding: 8px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-keys {
  color: var(--text-white);
}

.footer-link {
  color: var(--text-yellow);
  text-decoration: none;
  border: 1px solid var(--text-yellow);
  padding: 2px 8px;
}

.footer-link:hover {
  background: var(--text-yellow);
  color: #000055;
}

.hidden { display: none !important; }

.dim { opacity: 0.5; }

/* Processing indicator */
#processing-indicator {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-dark);
  border: 2px solid var(--text-yellow);
  padding: 20px 40px;
  z-index: 200;
  color: var(--text-yellow);
  font-size: 16px;
  box-shadow: 0 0 30px rgba(0, 0, 170, 0.8);
}

#processing-indicator.hidden { display: none; }

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.blink {
  animation: blink 1s infinite;
}