:root {
  --bg: #000000;
  --panel: #101418;
  --panel-hi: #1c2530;
  --green: #55FF55;
  --cyan: #55FFFF;
  --amber: #FFAA33;
  --red: #FF5555;
  --border: #2a3a44;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: #000;
  color: var(--green);
  font-family: 'Share Tech Mono', monospace;
  min-height: 100%;
}

body {
  background:
    radial-gradient(ellipse at 50% 0%, #0a1410 0%, #000 70%);
}

/* CRT scanlines */
.scanlines {
  position: fixed; inset: 0; z-index: 999; pointer-events: none;
  background: repeating-linear-gradient(
    to bottom, rgba(0,0,0,0) 0px, rgba(0,0,0,0) 2px,
    rgba(0,0,0,0.25) 3px, rgba(0,0,0,0.25) 4px);
  opacity: 0.5;
}
.vignette {
  position: fixed; inset: 0; z-index: 998; pointer-events: none;
  box-shadow: inset 0 0 180px 40px rgba(0,0,0,0.9);
}

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  position: relative;
  z-index: 1;
}

header { text-align: center; margin-bottom: 22px; }

h1 {
  font-family: 'VT323', monospace;
  font-size: clamp(2.4rem, 8vw, 4.5rem);
  letter-spacing: 4px;
  margin: 0;
  color: var(--cyan);
  text-shadow: 0 0 8px rgba(85,255,255,0.7), 0 0 24px rgba(85,255,255,0.4);
}
.cursor { animation: blink 1s steps(2) infinite; color: var(--green); }
@keyframes blink { 0%,50% { opacity: 1; } 51%,100% { opacity: 0; } }

.tagline {
  font-size: 0.85rem; color: var(--amber);
  letter-spacing: 1px; margin: 6px 0 0; opacity: 0.85;
}

/* control panel */
.panel {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  background: linear-gradient(180deg, var(--panel-hi), var(--panel));
  border: 2px solid var(--border);
  border-top-color: #3a4e5c; border-left-color: #3a4e5c;
  padding: 12px; border-radius: 4px;
  margin-bottom: 22px;
  box-shadow: inset 0 0 0 1px #000;
}

.ctrl {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.85rem; color: var(--cyan);
}
.ctrl.chk { color: var(--green); cursor: pointer; user-select: none; }
.ctrl input[type=number] {
  width: 58px; background: #000; color: var(--green);
  border: 1px solid var(--border); font-family: inherit;
  padding: 5px 6px; font-size: 0.9rem; text-align: center;
}
.ctrl input[type=number]:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 6px rgba(85,255,255,0.5); }
.ctrl input[type=checkbox] { accent-color: var(--green); width: 15px; height: 15px; }

.btn {
  font-family: 'VT323', monospace; font-size: 1.05rem;
  letter-spacing: 1px; cursor: pointer;
  background: #000; color: var(--green);
  border: 2px solid var(--green);
  padding: 6px 14px; border-radius: 3px;
  transition: all 0.1s; text-transform: uppercase;
  box-shadow: 0 3px 0 rgba(85,255,85,0.25);
}
.btn:hover:not(:disabled) { background: var(--green); color: #000; box-shadow: 0 0 12px var(--green); }
.btn:active:not(:disabled) { transform: translateY(3px); box-shadow: none; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.upload-btn { border-color: var(--cyan); color: var(--cyan); box-shadow: 0 3px 0 rgba(85,255,255,0.25); }
.upload-btn:hover { background: var(--cyan); color: #000; box-shadow: 0 0 12px var(--cyan); }
.file-ctrl { cursor: pointer; }
.forge-btn { border-color: var(--amber); color: var(--amber); box-shadow: 0 3px 0 rgba(255,170,51,0.3); margin-left: auto; }
.forge-btn:hover { background: var(--amber); color: #000; box-shadow: 0 0 14px var(--amber); }

/* previews */
.previews {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
  margin-bottom: 20px;
}
.canvas-col { display: flex; flex-direction: column; align-items: center; }
.label {
  font-family: 'VT323', monospace; font-size: 1.2rem;
  color: var(--cyan); letter-spacing: 2px; margin-bottom: 8px;
}
.canvas-frame {
  position: relative;
  border: 2px solid var(--border);
  background:
    repeating-conic-gradient(#0a0a0a 0% 25%, #141414 0% 50%) 0 0 / 20px 20px;
  min-height: 200px; width: 100%;
  display: flex; align-items: center; justify-content: center;
  padding: 10px; border-radius: 3px; cursor: pointer;
  overflow: hidden;
}
.canvas-frame.drag { border-color: var(--green); box-shadow: 0 0 16px var(--green); }
.canvas-frame canvas {
  max-width: 100%; height: auto;
  image-rendering: pixelated; image-rendering: crisp-edges;
  display: block;
}
#srcCanvas { image-rendering: auto; }
.placeholder pre {
  color: var(--green); font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem; margin: 0; text-align: center;
  text-shadow: 0 0 6px rgba(85,255,85,0.6);
}
.dims { margin-top: 8px; font-size: 0.9rem; color: var(--cyan); }
.usage { font-size: 0.78rem; color: var(--amber); margin-top: 2px; }

/* palette */
.palette-strip {
  display: flex; flex-wrap: wrap; gap: 3px; justify-content: center;
  margin: 4px 0 24px; padding: 8px;
  border: 1px solid var(--border); border-radius: 3px;
  background: rgba(16,20,24,0.6);
}
.swatch {
  width: 42px; height: 34px; display: flex;
  align-items: center; justify-content: center;
  font-family: 'VT323', monospace; font-size: 1.1rem; font-weight: bold;
  cursor: help; border: 1px solid #000;
  transition: transform 0.1s;
}
.swatch:hover { transform: scale(1.18); z-index: 2; }

/* download section */
.download-sec {
  border: 2px solid var(--border); border-radius: 3px;
  background: rgba(16,20,24,0.7); padding: 14px;
}
.download-sec .btn { margin-right: 8px; margin-bottom: 10px; }
.copy-btn { border-color: var(--cyan); color: var(--cyan); box-shadow: 0 3px 0 rgba(85,255,255,0.25); }
.copy-btn:hover:not(:disabled) { background: var(--cyan); color: #000; box-shadow: 0 0 12px var(--cyan); }
.hexlabel { font-size: 0.8rem; color: var(--amber); margin: 4px 0 6px; letter-spacing: 1px; }
.hex-preview {
  background: #000; border: 1px solid var(--border);
  color: var(--green); padding: 10px; margin: 0;
  max-height: 260px; overflow: auto;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem; line-height: 1.1; white-space: pre;
  text-shadow: 0 0 4px rgba(85,255,85,0.5);
}

footer {
  margin-top: 26px; text-align: center;
  font-size: 0.78rem; color: var(--green); opacity: 0.8;
  padding-top: 14px; border-top: 1px solid var(--border);
}
footer a { color: var(--cyan); text-decoration: none; }
footer a:hover { text-decoration: underline; text-shadow: 0 0 6px var(--cyan); }

@media (max-width: 640px) {
  .previews { grid-template-columns: 1fr; }
  .forge-btn { margin-left: 0; width: 100%; }
  .panel { justify-content: center; }
}