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

:root {
  --bg: #0a0a0a;
  --panel-bg: #111;
  --panel-border: #2a2a2a;
  --green: #33ff33;
  --green-dim: #0a4f0a;
  --amber: #ffaa00;
  --red: #ff3333;
  --text: #c0c0c0;
  --text-bright: #e0e0e0;
  --mono: 'IBM Plex Mono', monospace;
  --pixel: 'Press Start 2P', monospace;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  overflow-x: hidden;
  min-height: 100vh;
}

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

/* Header */
#header {
  text-align: center;
  padding: 12px 0 8px;
  border-bottom: 1px solid var(--panel-border);
  margin-bottom: 10px;
}
.title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.acorn-icon {
  font-size: 28px;
  animation: wobble 3s ease-in-out infinite;
}
@keyframes wobble {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(5deg); }
  75% { transform: rotate(-5deg); }
}
#header h1 {
  font-family: var(--pixel);
  font-size: 20px;
  color: var(--green);
  text-shadow: 0 0 10px var(--green), 0 0 20px var(--green-dim);
  letter-spacing: 1px;
}
.subtitle {
  font-size: 11px;
  color: #666;
  margin-top: 4px;
}

/* Main Layout */
#main-layout {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
#display-column {
  flex: 1;
  min-width: 0;
}
#sidebar {
  width: 310px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* CRT Bezel */
#crt-bezel {
  background: linear-gradient(145deg, #1a1a1a, #0d0d0d);
  border: 3px solid #222;
  border-radius: 18px;
  padding: 16px;
  box-shadow: inset 0 0 30px rgba(0,0,0,0.8), 0 4px 20px rgba(0,0,0,0.6);
  position: relative;
  margin-bottom: 10px;
}
#crt-screen {
  position: relative;
  background: #000800;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: inset 0 0 40px rgba(0,20,0,0.3);
}
#vdg-canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  filter: brightness(1.05) contrast(1.1);
}
#scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.15) 2px,
    rgba(0,0,0,0.15) 4px
  );
  pointer-events: none;
}
.bezel-label {
  text-align: center;
  font-size: 9px;
  color: #444;
  margin-top: 6px;
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* Panel */
.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 8px;
}
.panel-title {
  font-family: var(--pixel);
  font-size: 9px;
  color: var(--amber);
  margin-bottom: 6px;
  letter-spacing: 1px;
  border-bottom: 1px solid #222;
  padding-bottom: 4px;
}
.panel-hint {
  font-size: 10px;
  color: #555;
  margin-bottom: 6px;
}

/* Buttons */
.retro-btn {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  padding: 5px 10px;
  border: 2px outset #555;
  background: linear-gradient(180deg, #3a3a3a, #252525);
  color: var(--text-bright);
  cursor: pointer;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all 0.05s;
}
.retro-btn:hover { background: linear-gradient(180deg, #4a4a4a, #353535); }
.retro-btn:active {
  border-style: inset;
  transform: translateY(1px);
}
.retro-btn:disabled {
  opacity: 0.4;
  cursor: default;
}
.retro-btn.green { color: var(--green); border-color: var(--green-dim); }
.retro-btn.amber { color: var(--amber); border-color: #553300; }
.retro-btn.red { color: var(--red); border-color: #550000; }
.retro-btn.small { padding: 3px 7px; font-size: 10px; }
.btn-row { display: flex; gap: 6px; margin-top: 6px; flex-wrap: wrap; }

/* File panel */
#file-info {
  background: #0a0a0a;
  border: 1px solid #222;
  padding: 5px;
  margin-top: 6px;
  font-size: 10px;
  border-radius: 3px;
}
#file-info div { margin-bottom: 2px; }
#file-hex-preview {
  font-size: 9px;
  color: var(--green);
  word-break: break-all;
}
#load-message {
  margin-top: 6px;
  padding: 4px 8px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 700;
}
#load-message.success { background: #0a2f0a; color: var(--green); border: 1px solid var(--green-dim); }
.hidden { display: none !important; }

/* Speed */
.speed-control {
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.speed-control label { font-size: 10px; white-space: nowrap; }
.speed-control input[type=range] { flex: 1; accent-color: var(--green); }

/* Status */
.status-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  font-size: 11px;
  font-weight: 700;
}
.led {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #333;
  border: 1px solid #555;
  box-shadow: inset 0 0 2px rgba(0,0,0,0.5);
}
.led.green { background: var(--green); box-shadow: 0 0 6px var(--green); }
.led.amber { background: var(--amber); box-shadow: 0 0 6px var(--amber); }
.led.red { background: var(--red); box-shadow: 0 0 6px var(--red); }

/* Registers */
.register-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 4px;
}
.reg {
  background: #080808;
  border: 1px solid #1a1a1a;
  padding: 3px 5px;
  display: flex;
  align-items: center;
  gap: 4px;
  border-radius: 2px;
}
.reg.wide { grid-column: span 3; }
.reg-name {
  font-size: 9px;
  color: var(--amber);
  font-weight: 700;
  min-width: 18px;
}
.reg-val {
  font-size: 12px;
  color: var(--green);
  font-weight: 700;
  text-shadow: 0 0 4px var(--green-dim);
}
.flags {
  font-size: 8px;
  color: #666;
  margin-left: 8px;
  letter-spacing: 1px;
}
.flags .set { color: var(--green); font-weight: 700; }

/* Memory */
.mem-addr-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 4px;
}
.mem-addr-row label { font-size: 10px; color: var(--amber); }
.mem-addr-row input {
  background: #080808;
  border: 1px solid #333;
  color: var(--green);
  font-family: var(--mono);
  font-size: 12px;
  width: 50px;
  padding: 2px 4px;
  text-transform: uppercase;
}
#memory-view {
  background: #050505;
  border: 1px solid #1a1a1a;
  padding: 4px;
  font-size: 9px;
  line-height: 1.5;
  max-height: 160px;
  overflow-y: auto;
  color: var(--green);
  border-radius: 2px;
  white-space: pre;
}
#memory-view .pc-highlight { background: #333300; color: var(--amber); }
#memory-view .loaded-highlight { background: #002200; }

/* Sound */
.sound-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}
.sound-controls input[type=range] { flex: 1; accent-color: var(--green); }
#oscilloscope {
  width: 100%;
  height: 60px;
  background: #050505;
  border: 1px solid #1a1a1a;
  border-radius: 2px;
  display: block;
}

/* Keyboard */
#keyboard-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 8px;
}
#keyboard-status {
  display: flex;
  gap: 8px;
  margin-bottom: 6px;
}
.key-indicator {
  font-size: 9px;
  padding: 2px 6px;
  border-radius: 3px;
  background: #1a1a1a;
  color: #444;
  border: 1px solid #333;
}
.key-indicator.on {
  color: var(--green);
  border-color: var(--green-dim);
  background: #0a1f0a;
  text-shadow: 0 0 4px var(--green);
}
#keyboard {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.kb-row {
  display: flex;
  gap: 3px;
  justify-content: center;
}
.kb-key {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  min-width: 28px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #3a3a3a, #222);
  border: 1px outset #555;
  border-radius: 3px;
  color: #ccc;
  cursor: pointer;
  user-select: none;
  padding: 0 4px;
  transition: all 0.05s;
}
.kb-key:hover { background: linear-gradient(180deg, #4a4a4a, #333); }
.kb-key:active, .kb-key.pressed {
  border-style: inset;
  background: linear-gradient(180deg, #1a1a1a, #2a2a2a);
  transform: translateY(1px);
  color: var(--green);
}
.kb-key.wide { min-width: 50px; }
.kb-key.wider { min-width: 70px; }
.kb-key.space { min-width: 180px; }

/* Status bar */
#status-bar {
  display: flex;
  gap: 16px;
  padding: 6px 8px;
  margin-top: 8px;
  background: #0d0d0d;
  border: 1px solid var(--panel-border);
  border-radius: 3px;
  font-size: 10px;
  color: #555;
  flex-wrap: wrap;
}
#status-bar span { white-space: nowrap; }
#emu-log { color: var(--green); flex: 1; text-align: right; }

/* Footer */
footer {
  text-align: center;
  padding: 12px 0;
  font-size: 10px;
  color: #444;
}
footer a {
  color: var(--green);
  text-decoration: none;
  margin-right: 12px;
}
footer a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 860px) {
  #main-layout { flex-direction: column; }
  #sidebar { width: 100%; }
}