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

:root {
  --green: #00ff41;
  --green-dim: #00aa2a;
  --green-dark: #004d15;
  --amber: #ffb000;
  --red: #ff2442;
  --bg: #0a0a0a;
  --bg-panel: #111111;
  --bg-input: #1a1a1a;
  --border: #222;
  --text: #cccccc;
  --glow: 0 0 10px rgba(0, 255, 65, 0.3);
  --glow-strong: 0 0 20px rgba(0, 255, 65, 0.5), 0 0 40px rgba(0, 255, 65, 0.2);
}

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

#app { max-width: 1200px; margin: 0 auto; padding: 10px; }

header { text-align: center; padding: 15px 10px; border-bottom: 2px solid var(--green-dark); margin-bottom: 20px; position: relative; }
header h1 {
  font-family: 'Press Start 2P', monospace;
  font-size: clamp(10px, 2.5vw, 18px);
  color: var(--green);
  text-shadow: var(--glow);
  letter-spacing: 2px;
  line-height: 1.5;
}
header .dash { color: var(--amber); }
.subtitle { margin-top: 8px; font-size: 16px; color: var(--green-dim); letter-spacing: 1px; }
.subtitle .chip-name { color: var(--amber); text-shadow: 0 0 8px rgba(255,176,0,0.4); }

.badge { position: absolute; top: 10px; right: 10px; font-size: 11px; color: var(--green-dim); font-family: 'VT323', monospace; }

#main-container { display: flex; flex-direction: column; align-items: center; gap: 20px; }

#rom-panel { background: var(--bg-panel); border: 2px solid var(--green-dark); border-radius: 8px; padding: 24px; width: 100%; max-width: 700px; box-shadow: var(--glow); }
#rom-panel h2 { font-family: 'Press Start 2P', monospace; font-size: 14px; color: var(--green); text-shadow: var(--glow); margin-bottom: 8px; text-align: center; }
.rom-instructions { text-align: center; color: var(--green-dim); font-size: 14px; margin-bottom: 16px; }
#rom-slots { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 16px; }
.rom-slot { background: var(--bg-input); border: 1px solid var(--border); border-radius: 6px; padding: 10px; }
.rom-label { font-family: 'Press Start 2P', monospace; font-size: 10px; color: var(--green); margin-bottom: 6px; }
.rom-addr { color: var(--green-dim); font-size: 9px; }
.rom-dropzone { border: 1px dashed var(--green-dark); border-radius: 4px; padding: 12px 8px; text-align: center; cursor: pointer; transition: all 0.2s; position: relative; min-height: 50px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; }
.rom-dropzone:hover, .rom-dropzone.dragover { border-color: var(--green); background: rgba(0, 255, 65, 0.05); box-shadow: inset 0 0 15px rgba(0, 255, 65, 0.1); }
.rom-dropzone.loaded { border-color: var(--green); border-style: solid; background: rgba(0, 255, 65, 0.08); }
.rom-status { font-size: 18px; }
.rom-text { font-size: 12px; color: var(--green-dim); }
.rom-input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.rom-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn { font-family: 'Press Start 2P', monospace; font-size: 11px; padding: 10px 18px; border: none; border-radius: 4px; cursor: pointer; transition: all 0.15s; text-transform: uppercase; letter-spacing: 1px; user-select: none; -webkit-user-select: none; touch-action: manipulation; }
.btn-primary { background: var(--green-dark); color: var(--green); border: 2px solid var(--green); box-shadow: var(--glow); }
.btn-primary:not(:disabled):hover { background: var(--green); color: #000; box-shadow: var(--glow-strong); }
.btn-primary:disabled { opacity: 0.3; cursor: not-allowed; box-shadow: none; }
.btn-primary:not(:disabled) { animation: glow-pulse 2s ease-in-out infinite; }
@keyframes glow-pulse { 0%, 100% { box-shadow: 0 0 10px rgba(0,255,65,0.3); } 50% { box-shadow: 0 0 25px rgba(0,255,65,0.6), 0 0 50px rgba(0,255,65,0.3); } }
.btn-secondary { background: var(--bg-input); color: var(--green); border: 1px solid var(--green-dark); cursor: pointer; }
.btn-secondary:hover { background: var(--green-dark); }
.btn-coin { background: #332200; color: var(--amber); border: 2px solid var(--amber); font-size: 12px; padding: 12px 20px; }
.btn-coin:active { transform: translateY(2px); box-shadow: none; }
.btn-start-game { background: #220011; color: var(--red); border: 2px solid var(--red); font-size: 11px; padding: 12px 16px; }
.btn-start-game:active { transform: translateY(2px); }
.btn-move, .btn-fire { background: var(--bg-input); color: var(--green); border: 2px solid var(--green-dark); font-size: 13px; padding: 14px 22px; border-bottom-width: 4px; }
.btn-fire { border-color: var(--red); color: var(--red); }
.btn-move:active, .btn-fire:active { transform: translateY(2px); border-bottom-width: 2px; }

#screen-container { width: 100%; max-width: 560px; display: flex; flex-direction: column; align-items: center; }
#screen-bezel { background: #000; border: 4px solid #1a1a1a; border-radius: 12px; padding: 16px; box-shadow: inset 0 0 60px rgba(0,0,0,0.8), 0 0 30px rgba(0,255,65,0.1); width: 100%; display: flex; justify-content: center; }
#crt-wrapper { position: relative; width: 100%; aspect-ratio: 224 / 256; max-width: 448px; }
#canvas { width: 100%; height: 100%; image-rendering: pixelated; image-rendering: -moz-crisp-edges; image-rendering: crisp-edges; display: block; background: #000; }
#scanlines { position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(0deg, transparent 0px, transparent 1px, rgba(0,0,0,0.15) 1px, rgba(0,0,0,0.15) 2px); mix-blend-mode: multiply; }
#scanlines.disabled { display: none; }
#crt-wrapper.crt-effect { filter: contrast(1.1) brightness(1.05); border-radius: 8px; overflow: hidden; box-shadow: inset 0 0 80px rgba(0,0,0,0.4); }
#stats-bar { display: flex; gap: 20px; padding: 8px; font-size: 13px; color: var(--green-dim); width: 100%; justify-content: center; }

#controls-panel { width: 100%; max-width: 560px; }
#game-controls { display: flex; flex-direction: column; gap: 10px; align-items: center; }
.control-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
#keyboard-map { margin-top: 16px; padding: 12px; background: var(--bg-panel); border: 1px solid var(--border); border-radius: 6px; }
#keyboard-map h3 { font-family: 'Press Start 2P', monospace; font-size: 10px; color: var(--green-dim); margin-bottom: 8px; text-align: center; }
.key-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; font-size: 13px; }
kbd { background: var(--bg-input); border: 1px solid var(--green-dark); border-radius: 3px; padding: 1px 5px; font-family: 'VT323', monospace; color: var(--green); font-size: 14px; }

#settings-panel { width: 100%; max-width: 560px; }
.settings-group { background: var(--bg-panel); border: 1px solid var(--border); border-radius: 6px; padding: 14px; }
.settings-group h3 { font-family: 'Press Start 2P', monospace; font-size: 10px; color: var(--green-dim); margin-bottom: 10px; }
.setting-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; font-size: 14px; }
.setting-row label { min-width: 100px; color: var(--green-dim); }
.setting-row select { background: var(--bg-input); color: var(--green); border: 1px solid var(--green-dark); padding: 4px 8px; font-family: 'VT323', monospace; font-size: 14px; border-radius: 3px; }
.setting-row input[type="checkbox"] { accent-color: var(--green); width: 18px; height: 18px; }

/* ================= SN76477 PANEL ================= */
#sn-panel {
  margin-top: 12px;
  background:
    linear-gradient(rgba(255,176,0,0.02), rgba(255,176,0,0.02)),
    repeating-linear-gradient(0deg, #0d0d08 0 22px, #0f0f0a 22px 44px),
    repeating-linear-gradient(90deg, #0d0d08 0 22px, #0f0f0a 22px 44px);
  border: 1px solid #4a3600;
  border-radius: 6px;
  padding: 12px;
  box-shadow: 0 0 14px rgba(255,176,0,0.08);
}
#sn-panel summary {
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  color: var(--amber);
  cursor: pointer; user-select: none;
  text-shadow: 0 0 8px rgba(255,176,0,0.4);
}
#sn-content { margin-top: 14px; }

/* chip package + block diagram */
#sn-chip { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
#sn-dip {
  position: relative;
  width: 120px; min-height: 100px;
  background: linear-gradient(135deg, #1b1b1b, #0b0b0b);
  border: 1px solid #333;
  border-radius: 4px;
  padding: 16px 10px;
  box-shadow: inset 0 0 12px rgba(0,0,0,0.8), 0 0 6px rgba(0,0,0,0.6);
}
.sn-notch { position: absolute; top: 4px; left: 50%; transform: translateX(-50%); width: 14px; height: 7px; border: 1px solid #333; border-top: none; border-radius: 0 0 8px 8px; }
.sn-silk { text-align: center; font-family: 'VT323', monospace; color: #d8d8d8; font-size: 15px; letter-spacing: 1px; margin-top: 6px; }
.sn-silk-sub { text-align: center; font-family: 'VT323', monospace; color: #777; font-size: 11px; }
.sn-pins { position: absolute; top: 12px; bottom: 12px; display: flex; flex-direction: column; justify-content: space-between; }
.sn-pins-left { left: -6px; }
.sn-pins-right { right: -6px; }
.sn-pin { width: 6px; height: 3px; background: #b9b9b9; border-radius: 1px; box-shadow: 0 0 2px rgba(0,0,0,0.6); }

#sn-blocks { display: flex; flex-wrap: wrap; gap: 6px; flex: 1; min-width: 160px; }
.sn-block {
  font-family: 'VT323', monospace; font-size: 13px;
  color: #6a6a4a;
  background: #100f08; border: 1px solid #2a2413; border-radius: 3px;
  padding: 4px 8px; display: inline-flex; align-items: center; gap: 6px;
  transition: all 0.12s;
}
.sn-block .sn-led { width: 8px; height: 8px; border-radius: 50%; background: #221a05; box-shadow: inset 0 0 2px #000; }
.sn-block.on { color: var(--amber); border-color: var(--amber); box-shadow: 0 0 8px rgba(255,176,0,0.3); }
.sn-block.on .sn-led { background: var(--amber); box-shadow: 0 0 8px var(--amber), 0 0 3px #fff; }

#sn-scope {
  width: 100%; max-width: 440px; height: auto;
  border: 1px solid #133; border-radius: 4px;
  background: #020402; display: block; margin-bottom: 12px;
  box-shadow: inset 0 0 20px rgba(0,255,65,0.05);
}

.sn-triggers { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.sn-trig {
  font-family: 'VT323', monospace; font-size: 12px; color: #555;
  display: inline-flex; align-items: center; gap: 5px;
  background: #0c0c0c; border: 1px solid #1e1e1e; border-radius: 3px; padding: 3px 7px;
  transition: all 0.1s;
}
.sn-trig .sn-led { width: 7px; height: 7px; border-radius: 50%; background: #0a1a0a; }
.sn-trig.on { color: var(--green); border-color: var(--green-dark); }
.sn-trig.on .sn-led { background: var(--green); box-shadow: 0 0 8px var(--green); }

.sn-h4 { font-family: 'Press Start 2P', monospace; font-size: 8px; color: var(--green-dim); margin: 4px 0 10px; letter-spacing: 1px; }

#sn-knobs { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; margin-bottom: 12px; }
.sn-knob { background: #0c0c0c; border: 1px solid #1e1e1e; border-radius: 4px; padding: 8px; text-align: center; }
.sn-knob label { display: block; font-family: 'VT323', monospace; font-size: 13px; color: var(--green-dim); margin-bottom: 4px; }
.sn-dial { width: 100%; accent-color: var(--amber); height: 5px; cursor: pointer; }
.sn-knob-val { display: block; margin-top: 4px; font-family: 'VT323', monospace; font-size: 14px; color: var(--amber); }

.sn-actions { display: flex; justify-content: flex-end; margin-bottom: 14px; }
.btn-sn { background: #101010; color: var(--amber); border: 1px solid var(--amber); font-size: 9px; padding: 8px 14px; }
.btn-sn:hover { background: #2a2000; box-shadow: 0 0 10px rgba(255,176,0,0.3); }

#sn-testfire { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 6px; }
.btn-tf { background: #0d0d0d; color: var(--green); border: 1px solid var(--green-dark); font-size: 8px; padding: 8px 6px; }
.btn-tf:hover { background: var(--green-dark); color: var(--green); }
.btn-tf.tf-flash { background: var(--green); color: #000; box-shadow: 0 0 12px var(--green); }

/* Debug */
#debug-panel { margin-top: 12px; background: var(--bg-panel); border: 1px solid var(--border); border-radius: 6px; padding: 10px; }
#debug-panel summary { font-family: 'Press Start 2P', monospace; font-size: 9px; color: var(--amber); cursor: pointer; user-select: none; }
#debug-content { margin-top: 10px; }
#cpu-state { font-family: 'VT323', monospace; font-size: 13px; color: var(--green); background: #000; padding: 8px; border-radius: 4px; border: 1px solid var(--border); overflow-x: auto; white-space: pre; line-height: 1.5; }

/* Memory Corruption Panel */
#corruption-panel { margin-top: 12px; background: var(--bg-panel); border: 1px solid #442200; border-radius: 6px; padding: 14px; box-shadow: 0 0 10px rgba(255, 100, 0, 0.08); }
#corruption-panel h3 { font-family: 'Press Start 2P', monospace; font-size: 10px; color: var(--amber); margin-bottom: 4px; text-shadow: 0 0 8px rgba(255, 176, 0, 0.4); }
.corruption-desc { font-size: 12px; color: #886622; margin-bottom: 10px; }
.corruption-controls { display: flex; flex-direction: column; gap: 8px; }
.corruption-slider-row, .corruption-region-row { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.corruption-slider-row label, .corruption-region-row label { min-width: 65px; color: var(--amber); font-size: 13px; }
#corruption-amount { flex: 1; accent-color: var(--amber); cursor: pointer; height: 6px; }
.corruption-val { min-width: 70px; text-align: right; color: var(--amber); font-size: 13px; font-family: 'VT323', monospace; }
#corruption-region { background: var(--bg-input); color: var(--amber); border: 1px solid #442200; padding: 4px 8px; font-family: 'VT323', monospace; font-size: 14px; border-radius: 3px; flex: 1; }
.btn-corrupt { background: #331100; color: var(--amber); border: 2px solid #ff6600; font-family: 'Press Start 2P', monospace; font-size: 11px; padding: 10px 18px; cursor: pointer; border-radius: 4px; transition: all 0.15s; text-transform: uppercase; letter-spacing: 1px; margin-top: 4px; text-shadow: 0 0 6px rgba(255, 102, 0, 0.5); box-shadow: 0 0 10px rgba(255, 102, 0, 0.15); }
.btn-corrupt:hover { background: #552200; box-shadow: 0 0 20px rgba(255, 102, 0, 0.4), 0 0 40px rgba(255, 102, 0, 0.15); text-shadow: 0 0 12px rgba(255, 102, 0, 0.8); }
.btn-corrupt:active { transform: translateY(2px); background: #ff6600; color: #000; }
.btn-corrupt.corrupting { animation: corrupt-flash 0.3s ease-out; }
@keyframes corrupt-flash { 0% { box-shadow: 0 0 30px rgba(255, 50, 0, 0.8); background: #ff3300; color: #fff; } 100% { box-shadow: 0 0 10px rgba(255, 102, 0, 0.15); background: #331100; color: var(--amber); } }

footer { text-align: center; padding: 20px 10px; margin-top: 30px; border-top: 1px solid var(--green-dark); }
footer a { color: var(--green-dim); text-decoration: none; font-family: 'Press Start 2P', monospace; font-size: 10px; letter-spacing: 1px; }
footer a:hover { color: var(--green); text-shadow: var(--glow); }

.hidden { display: none !important; }

@media (max-width: 600px) {
  #rom-slots { grid-template-columns: 1fr; }
  .key-grid { grid-template-columns: 1fr; }
  .badge { position: static; margin-top: 4px; }
  .btn { font-size: 10px; padding: 8px 12px; }
  #sn-knobs { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  #main-container { display: grid; grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: 20px; align-items: start; }
  #rom-panel { grid-column: 1 / -1; }
  #screen-container { grid-column: 1; max-width: 100%; }
  #controls-panel { grid-column: 1; }
  #settings-panel { grid-column: 2; grid-row: 2 / 4; max-width: 340px; }
}