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

:root {
  --dos-blue: #0000AA;
  --dos-dark-blue: #000080;
  --dos-cyan: #00AAAA;
  --dos-bright-cyan: #55FFFF;
  --dos-white: #AAAAAA;
  --dos-bright-white: #FFFFFF;
  --dos-yellow: #FFFF55;
  --dos-gray: #C0C0C0;
  --dos-dark-gray: #808080;
  --dos-light-gray: #DFDFDF;
  --dos-black: #000000;
  --dos-green: #00AA00;
  --dos-bright-green: #55FF55;
  --bevel-light: #FFFFFF;
  --bevel-dark: #404040;
  --bevel-mid: #808080;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  background: var(--dos-blue);
  color: var(--dos-bright-white);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-size: 13px;
  overflow-x: hidden;
  -webkit-font-smoothing: none;
}

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

/* Header */
#header {
  background: var(--dos-dark-blue);
  border-bottom: 2px solid var(--dos-cyan);
  flex-shrink: 0;
}

.header-bar {
  background: var(--dos-white);
  color: var(--dos-black);
  padding: 2px 8px;
  font-size: 12px;
  letter-spacing: 1px;
}

.header-title {
  padding: 8px 16px 6px;
  text-align: center;
}

.header-title h1 {
  font-size: 20px;
  font-weight: 700;
  color: var(--dos-yellow);
  text-shadow: 2px 2px 0 var(--dos-black);
  letter-spacing: 2px;
}

.subtitle {
  color: var(--dos-bright-cyan);
  font-size: 11px;
  font-style: italic;
  margin-top: 2px;
}

/* Main container */
#main-container {
  flex: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
}

/* DOS Dialog box style */
.dos-dialog {
  background: var(--dos-gray);
  color: var(--dos-black);
  border: 2px solid;
  border-color: var(--bevel-light) var(--bevel-dark) var(--bevel-dark) var(--bevel-light);
  box-shadow: inset 1px 1px 0 var(--dos-light-gray), inset -1px -1px 0 var(--bevel-mid);
}

.dialog-title {
  background: linear-gradient(90deg, var(--dos-dark-blue), var(--dos-blue));
  color: var(--dos-bright-white);
  padding: 3px 8px;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  min-height: 24px;
}

/* DOS Button */
.dos-btn {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  background: var(--dos-gray);
  color: var(--dos-black);
  border: 2px solid;
  border-color: var(--bevel-light) var(--bevel-dark) var(--bevel-dark) var(--bevel-light);
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  outline: none;
  white-space: nowrap;
  min-height: 32px;
  touch-action: manipulation;
}

.dos-btn:hover {
  background: var(--dos-light-gray);
}

.dos-btn:active {
  border-color: var(--bevel-dark) var(--bevel-light) var(--bevel-light) var(--bevel-dark);
  padding: 7px 13px 5px 15px;
}

.dos-btn.small {
  padding: 4px 8px;
  font-size: 12px;
  min-height: 28px;
}

.dos-btn.large {
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 700;
  min-height: 44px;
}

.dos-btn.active {
  background: var(--dos-dark-blue);
  color: var(--dos-bright-white);
  border-color: var(--bevel-dark) var(--bevel-light) var(--bevel-light) var(--bevel-dark);
}

/* Upload zone */
#upload-zone {
  max-width: 560px;
  margin: 30px auto;
  width: 100%;
}

#drop-area {
  padding: 32px 16px;
  text-align: center;
  border: 2px dashed var(--dos-cyan);
  margin: 8px;
  background: var(--dos-dark-blue);
  color: var(--dos-bright-white);
  cursor: pointer;
  transition: background 0.2s;
}

#drop-area.dragover {
  background: #001166;
  border-color: var(--dos-yellow);
}

.ascii-art {
  color: var(--dos-bright-cyan);
  font-size: 14px;
  line-height: 1.3;
  margin-bottom: 12px;
}

.dim {
  color: var(--dos-white);
  font-size: 11px;
}

.small {
  font-size: 10px;
}

#file-info {
  color: var(--dos-yellow);
  margin-top: 8px;
  font-size: 12px;
}

/* Toolbar */
#toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  background: var(--dos-gray);
  border: 2px solid;
  border-color: var(--bevel-light) var(--bevel-dark) var(--bevel-dark) var(--bevel-light);
  color: var(--dos-black);
  font-size: 12px;
  flex-wrap: wrap;
}

#zoom-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

#zoom-level {
  min-width: 44px;
  text-align: center;
  font-size: 11px;
}

.crt-toggle {
  margin-left: auto;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 28px;
  padding: 2px 6px;
}

/* Workspace */
#workspace {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Preview section */
#preview-section {
  display: flex;
  gap: 8px;
  min-height: 260px;
}

.preview-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--dos-gray);
  border: 2px solid;
  border-color: var(--bevel-light) var(--bevel-dark) var(--bevel-dark) var(--bevel-light);
  min-width: 0;
}

.canvas-wrapper {
  flex: 1;
  overflow: auto;
  background: #1a1a2e;
  position: relative;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid;
  border-color: var(--bevel-dark) var(--bevel-light) var(--bevel-light) var(--bevel-dark);
  margin: 4px;
}

.canvas-wrapper canvas {
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
  max-width: 100%;
  max-height: 100%;
}

#crt-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,0,0,0.12) 0px,
    rgba(0,0,0,0.12) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: multiply;
  z-index: 10;
}

/* Controls section */
#controls-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 8px;
}

.control-group {
  padding: 0;
}

.control-group > :not(.dialog-title) {
  padding: 8px;
}

/* Depth options */
.depth-options {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.depth-option {
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 4px 6px;
  border: 1px solid transparent;
  min-height: 32px;
}

.depth-option:hover {
  background: var(--dos-light-gray);
}

.depth-option input[type="radio"] {
  margin-right: 8px;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.depth-label {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.depth-swatch {
  display: inline-flex;
  width: 40px;
  height: 12px;
  border: 1px solid var(--dos-black);
  flex-shrink: 0;
}

/* Dither options */
.dither-options {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.dither-option {
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 4px 6px;
  min-height: 32px;
}

.dither-option:hover {
  background: var(--dos-light-gray);
}

.dither-option input[type="radio"] {
  margin-right: 8px;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Size controls */
.size-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.size-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

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

.dos-input {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  background: var(--dos-bright-white);
  color: var(--dos-black);
  border: 2px solid;
  border-color: var(--bevel-dark) var(--bevel-light) var(--bevel-light) var(--bevel-dark);
  padding: 4px 6px;
  font-size: 13px;
  width: 70px;
  min-height: 32px;
}

/* Slider */
.dos-slider {
  width: 100%;
  margin-top: 4px;
  accent-color: var(--dos-dark-blue);
  height: 20px;
}

#threshold-control {
  padding: 4px 8px 8px;
}

/* Palette display */
#palette-display {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  min-height: 16px;
}

#palette-display .pal-color {
  width: 14px;
  height: 14px;
  border: 1px solid var(--dos-black);
  display: inline-block;
}

/* Export controls */
.export-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

#est-size {
  font-size: 12px;
}

/* Status bar / footer */
#status-bar {
  background: var(--dos-gray);
  color: var(--dos-black);
  border-top: 2px solid;
  border-color: var(--bevel-light) var(--bevel-dark) var(--bevel-dark) var(--bevel-light);
  padding: 4px 10px;
  font-size: 11px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  flex-shrink: 0;
  min-height: 28px;
}

#status-bar a {
  color: var(--dos-dark-blue);
  text-decoration: underline;
}

.status-left, .status-right {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.footer-sep {
  opacity: 0.5;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.modal-content {
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  max-height: 80dvh;
  overflow: auto;
}

.modal-content pre {
  background: var(--dos-dark-blue);
  color: var(--dos-bright-green);
  padding: 12px;
  margin: 8px;
  font-size: 11px;
  overflow-x: auto;
  border: 2px solid;
  border-color: var(--bevel-dark) var(--bevel-light) var(--bevel-light) var(--bevel-dark);
  white-space: pre-wrap;
  word-break: break-all;
}

.modal-content button {
  margin: 8px;
}

.modal-close {
  float: right;
}

/* Loading screen */
#loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--dos-black);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  color: var(--dos-white);
  flex-direction: column;
  transition: opacity 0.3s;
}

#loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-text {
  text-align: center;
  padding: 20px;
}

.loading-title {
  color: var(--dos-yellow);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  text-shadow: 0 0 10px rgba(255, 255, 85, 0.4);
}

.loading-text p {
  margin: 4px 0;
  font-size: 13px;
}

.loading-bar {
  width: 200px;
  height: 16px;
  border: 2px solid var(--dos-white);
  margin: 12px auto;
  background: var(--dos-black);
}

.loading-fill {
  height: 100%;
  background: var(--dos-bright-cyan);
  width: 0%;
  transition: width 0.3s;
}

.blink-text {
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* Easter egg */
#easter-egg {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--dos-black);
  color: var(--dos-bright-green);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3000;
  font-size: 16px;
  padding: 20px;
}

#run-animation {
  text-align: center;
  white-space: pre;
  font-size: 14px;
}

/* ===== Responsive ===== */

/* Tablet and smaller */
@media (max-width: 768px) {
  #preview-section {
    flex-direction: column;
    min-height: auto;
  }

  .canvas-wrapper {
    min-height: 160px;
    max-height: 250px;
  }

  #controls-section {
    grid-template-columns: 1fr;
  }

  .header-bar {
    display: none;
  }

  .header-title h1 {
    font-size: 17px;
    letter-spacing: 1px;
  }

  .subtitle {
    font-size: 10px;
  }

  #main-container {
    padding: 8px;
    gap: 8px;
  }

  #upload-zone {
    margin: 16px auto;
  }

  #drop-area {
    padding: 24px 12px;
  }

  .ascii-art {
    font-size: 12px;
  }
}

/* Phone */
@media (max-width: 480px) {
  body {
    font-size: 12px;
  }

  #main-container {
    padding: 4px;
    gap: 6px;
  }

  .header-title {
    padding: 6px 10px 4px;
  }

  .header-title h1 {
    font-size: 15px;
  }

  #upload-zone {
    margin: 10px auto;
  }

  #drop-area {
    padding: 20px 10px;
  }

  .ascii-art {
    font-size: 11px;
  }

  #toolbar {
    gap: 4px;
    padding: 3px 4px;
  }

  .size-presets .dos-btn.small {
    font-size: 11px;
    padding: 3px 5px;
  }

  .dos-btn.large {
    padding: 8px 16px;
    font-size: 13px;
    width: 100%;
  }

  .dos-btn {
    font-size: 12px;
  }

  .export-controls {
    align-items: stretch;
  }

  #status-bar {
    flex-direction: column;
    text-align: center;
    padding: 4px 6px;
    font-size: 10px;
  }

  .status-left, .status-right {
    justify-content: center;
  }

  .hide-mobile {
    display: none;
  }
}