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

:root {
  --cga-black: #000000;
  --cga-blue: #0000AA;
  --cga-green: #00AA00;
  --cga-cyan: #00AAAA;
  --cga-red: #AA0000;
  --cga-magenta: #AA00AA;
  --cga-brown: #AA5500;
  --cga-lgray: #AAAAAA;
  --cga-dgray: #555555;
  --cga-lblue: #5555FF;
  --cga-lgreen: #55FF55;
  --cga-lcyan: #55FFFF;
  --cga-lred: #FF5555;
  --cga-lmagenta: #FF55FF;
  --cga-yellow: #FFFF55;
  --cga-white: #FFFFFF;
  --bg: #0a0a0e;
  --panel-bg: #111118;
  --border: #2a2a35;
  --text: #AAAAAA;
  --accent-cyan: #55FFFF;
  --accent-magenta: #FF55FF;
  --accent-green: #55FF55;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  line-height: 1.5;
  min-height: 100vh;
}

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

/* Header */
#header {
  position: relative;
  background: linear-gradient(135deg, #000022 0%, #001133 40%, #220033 100%);
  border-bottom: 2px solid var(--accent-cyan);
  padding: 20px 24px;
  text-align: center;
  overflow: hidden;
}
#header .scanline-overlay {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,255,255,0.03) 2px,
    rgba(0,255,255,0.03) 4px
  );
  pointer-events: none;
}
#header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--cga-white);
  text-shadow: 0 0 10px rgba(85,255,255,0.5), 0 0 30px rgba(85,255,255,0.2);
  position: relative;
  z-index: 1;
}
#header .monitor-icon { font-size: 24px; }
#header .subtitle {
  color: var(--accent-cyan);
  font-size: 12px;
  margin-top: 4px;
  position: relative;
  z-index: 1;
  opacity: 0.8;
}

/* Layout */
#main-layout {
  display: flex;
  flex: 1;
  gap: 0;
}

#sidebar {
  width: 300px;
  min-width: 300px;
  background: var(--panel-bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  max-height: calc(100vh - 140px);
}

.panel {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}
.panel h2 {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Upload zones */
.upload-zone {
  border: 2px dashed var(--accent-cyan);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 12px;
  background: rgba(85,255,255,0.02);
}
.upload-zone:hover, .upload-zone.drag-over {
  background: rgba(85,255,255,0.08);
  border-color: var(--cga-white);
}
.upload-zone.rom-zone {
  border-color: var(--accent-magenta);
  background: rgba(255,85,255,0.02);
}
.upload-zone.rom-zone:hover, .upload-zone.rom-zone.drag-over {
  background: rgba(255,85,255,0.08);
  border-color: var(--cga-white);
}
.upload-icon { font-size: 28px; margin-bottom: 4px; }
.upload-label { font-weight: 700; color: var(--cga-white); font-size: 12px; }
.upload-hint { font-size: 10px; color: var(--cga-lgray); margin-top: 4px; }
.upload-info { font-size: 11px; color: var(--accent-green); margin-top: 6px; min-height: 16px; }
.file-input { display: none; }

/* Settings */
.setting-label {
  display: block;
  font-size: 11px;
  color: var(--accent-cyan);
  margin: 10px 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.setting-label:first-child { margin-top: 0; }

select, .num-input {
  width: 100%;
  background: var(--bg);
  color: var(--cga-white);
  border: 1px solid var(--border);
  padding: 6px 8px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  outline: none;
}
select:focus, .num-input:focus {
  border-color: var(--accent-cyan);
}

input[type="range"] {
  width: 100%;
  margin: 4px 0;
  accent-color: var(--accent-cyan);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text);
  margin: 8px 0;
  cursor: pointer;
}
.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent-cyan);
}

.cga-btn {
  display: block;
  width: 100%;
  background: var(--bg);
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
  padding: 8px 12px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all 0.15s;
  margin-bottom: 8px;
}
.cga-btn:hover {
  background: var(--accent-cyan);
  color: var(--cga-black);
}
.cga-btn.accent {
  border-color: var(--accent-magenta);
  color: var(--accent-magenta);
}
.cga-btn.accent:hover {
  background: var(--accent-magenta);
  color: var(--cga-black);
}

/* Palette grid */
#palette-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 3px;
}
.palette-swatch {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  cursor: pointer;
  position: relative;
}
.palette-swatch:hover {
  border-color: var(--cga-white);
  transform: scale(1.15);
  z-index: 1;
}
.palette-swatch .tooltip {
  display: none;
  position: absolute;
  bottom: 110%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--cga-black);
  border: 1px solid var(--accent-cyan);
  padding: 2px 6px;
  font-size: 9px;
  white-space: nowrap;
  color: var(--cga-white);
  z-index: 10;
}
.palette-swatch:hover .tooltip { display: block; }

/* Main display */
#display-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  overflow: auto;
}

#canvas-wrapper {
  position: relative;
  background: #1a1a1a;
  border: 3px solid #333;
  box-shadow: 0 0 40px rgba(0,0,0,0.8), inset 0 0 80px rgba(0,0,0,0.3);
  border-radius: 4px;
}
#canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  -ms-interpolation-mode: nearest-neighbor;
}

#crt-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 1px,
    rgba(0,0,0,0.15) 1px,
    rgba(0,0,0,0.15) 2px
  );
  mix-blend-mode: multiply;
}
#crt-overlay.hidden { display: none; }

#status-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 12px;
  padding: 8px 12px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  font-size: 11px;
  width: 100%;
  max-width: 900px;
}
#status-bar span { color: var(--cga-lgray); }

#hover-info {
  margin-top: 6px;
  padding: 6px 12px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  font-size: 11px;
  color: var(--accent-green);
  width: 100%;
  max-width: 900px;
  min-height: 28px;
}

/* Footer */
#footer {
  text-align: center;
  padding: 16px;
  border-top: 1px solid var(--border);
  background: var(--panel-bg);
  font-size: 11px;
}
#footer p { color: var(--cga-dgray); margin-bottom: 4px; }
#footer a { color: var(--accent-cyan); text-decoration: none; }
#footer a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 900px) {
  #main-layout {
    flex-direction: column;
  }
  #sidebar {
    width: 100%;
    min-width: 100%;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  #display-area {
    padding: 12px;
  }
  #status-bar {
    flex-direction: column;
    gap: 4px;
  }
}