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

:root {
  --bg: #0a0a0e;
  --panel-bg: #131318;
  --panel-border: #2a2a35;
  --green: #33ff33;
  --green-dim: #1a8c1a;
  --green-dark: #001100;
  --amber: #ffaa33;
  --amber-dim: #cc7700;
  --cream: #d4c5a9;
  --cream-dark: #a89878;
  --text: #c8c8d0;
  --text-dim: #666670;
  --red: #ff4444;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --font-pixel: 'Press Start 2P', monospace;
}

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

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

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
  background: linear-gradient(180deg, #1a1a22, #111118);
  border-bottom: 2px solid var(--panel-border);
}
header h1 {
  font-family: var(--font-pixel);
  font-size: 14px;
  color: var(--green);
  text-shadow: 0 0 10px rgba(51,255,51,0.4);
}
.subtitle {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 4px;
}
.status-area {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-pixel);
  font-size: 10px;
}
.status-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #555;
  box-shadow: 0 0 4px #333;
  transition: all 0.3s;
}
.status-dot.on { background: var(--green); box-shadow: 0 0 10px var(--green); }
.status-dot.loading { background: var(--amber); box-shadow: 0 0 10px var(--amber); }
.status-dot.halted { background: var(--red); box-shadow: 0 0 10px var(--red); }

/* MAIN LAYOUT */
#mainLayout {
  display: grid;
  grid-template-columns: 260px 1fr 260px;
  gap: 0;
  flex: 1;
}

/* PANELS */
aside {
  padding: 10px;
  overflow-y: auto;
  max-height: calc(100vh - 60px);
}
.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  margin-bottom: 10px;
  padding: 10px;
}
.panel h2 {
  font-family: var(--font-pixel);
  font-size: 9px;
  color: var(--amber);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ROM SLOTS */
.rom-slot {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  padding: 4px 6px;
  background: rgba(0,0,0,0.3);
  border: 1px solid #222;
  font-size: 10px;
}
.rom-slot .rom-icon { font-size: 14px; flex-shrink: 0; }
.rom-slot .rom-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-dim); }
.rom-slot .rom-name.loaded { color: var(--green); }
.rom-slot label.rom-upload-btn {
  cursor: pointer;
  background: #2a2a35;
  padding: 2px 6px;
  font-size: 9px;
  border: 1px solid #444;
  color: var(--text);
}
.rom-slot label.rom-upload-btn:hover { background: #3a3a45; }
.rom-actions {
  display: flex; gap: 6px; margin-top: 8px;
}

/* RAM OPTIONS */
.ram-options {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ram-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  background: rgba(0,0,0,0.3);
  border: 1px solid #222;
  cursor: pointer;
  font-size: 11px;
}
.ram-option input { accent-color: var(--green); }
.ram-option span { color: var(--green); font-weight: 700; }
.ram-option small { color: var(--text-dim); margin-left: auto; font-size: 9px; }

/* RETRO BUTTONS */
.retro-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 6px 12px;
  cursor: pointer;
  background: #2a2a35;
  color: var(--text);
  border: 2px solid;
  border-color: #555 #222 #222 #555;
  outline: none;
  transition: all 0.1s;
}
.retro-btn:hover:not(:disabled) { background: #3a3a48; }
.retro-btn:active:not(:disabled) {
  border-color: #222 #555 #555 #222;
  transform: translateY(1px);
}
.retro-btn:disabled { opacity: 0.4; cursor: default; }
.retro-btn.small-btn { font-size: 10px; padding: 4px 8px; }

.power-btn {
  background: #1a3a1a;
  color: var(--green);
  border-color: var(--green-dim) #0a1a0a #0a1a0a var(--green-dim);
  font-weight: 700;
}
.power-btn.on {
  background: #3a1a1a;
  color: var(--red);
  border-color: #cc4444 #220a0a #220a0a #cc4444;
}

/* CRT */
.crt-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 15px;
}
.crt-bezel {
  position: relative;
  background: #0a0a0a;
  border: 8px solid #1a1a1a;
  border-radius: 12px;
  box-shadow:
    0 0 30px rgba(51,255,51,0.15),
    inset 0 0 60px rgba(0,0,0,0.8),
    0 0 2px #333;
  overflow: hidden;
}
#screen {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: var(--green-dark);
}
.scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 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
  );
}
.crt-controls {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

/* CONTROL BAR */
.control-bar {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  flex-wrap: wrap;
}

/* KEYBOARD */
.keyboard {
  padding: 10px;
  background: #1e1e24;
  border-top: 2px solid var(--panel-border);
}
.kb-row {
  display: flex;
  justify-content: center;
  gap: 3px;
  margin-bottom: 3px;
}
.kb-row .kb-spacer {
  width: 20px;
}
.kb-key {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 32px;
  padding: 2px 4px;
  background: var(--cream);
  color: #222;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  border: 2px solid;
  border-color: #e8dcc8 #8a7a60 #8a7a60 #e8dcc8;
  cursor: pointer;
  user-select: none;
  text-align: center;
  white-space: nowrap;
}
.kb-key:active, .kb-key.pressed {
  background: #a89878;
  border-color: #8a7a60 #e8dcc8 #e8dcc8 #8a7a60;
  transform: translateY(1px);
}
.kb-key.special {
  background: #888;
  color: #fff;
  min-width: 52px;
}
.kb-key.space-key {
  min-width: 200px;
}
.kb-key.shift-active {
  background: var(--amber);
  color: #111;
}

/* PERIPHERALS */
.periph-section {
  margin-bottom: 6px;
  border: 1px solid #222;
}
.periph-section summary {
  padding: 6px 8px;
  background: rgba(0,0,0,0.3);
  cursor: pointer;
  font-size: 11px;
  color: var(--amber);
}
.periph-content {
  padding: 8px;
}
.periph-info {
  font-size: 10px;
  color: var(--text-dim);
  margin-top: 6px;
}
.prg-actions {
  display: flex; gap: 6px; margin-top: 6px;
}

.help-content {
  padding: 8px;
  font-size: 10px;
  line-height: 1.6;
  color: var(--text-dim);
}
.help-content p { margin-bottom: 6px; }

/* DEBUG PANEL */
.debug-panel {
  background: var(--panel-bg);
  border-top: 2px solid var(--amber);
  padding: 10px 20px;
  font-size: 11px;
}
.debug-panel.hidden { display: none; }
.debug-panel h3 {
  font-family: var(--font-pixel);
  font-size: 9px;
  color: var(--amber);
  margin-bottom: 8px;
}
.debug-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  align-items: flex-start;
}
.debug-regs, .debug-flags, .debug-info {
  display: flex; gap: 10px;
}
.debug-regs b, .debug-flags b, .debug-info b {
  color: var(--green);
}
.debug-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}
.debug-controls input {
  background: #1a1a22;
  border: 1px solid #444;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 6px;
  width: 60px;
}
.mem-inspector {
  font-size: 10px;
  color: var(--green);
  background: #0a0a0e;
  padding: 8px;
  max-height: 120px;
  overflow-y: auto;
  white-space: pre;
  width: 100%;
  border: 1px solid #222;
}

/* FOOTER */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 20px;
  font-size: 10px;
  color: var(--text-dim);
  border-top: 1px solid var(--panel-border);
  background: #0e0e14;
}
footer a {
  color: var(--amber);
  text-decoration: none;
}
footer a:hover { text-decoration: underline; }

/* RESPONSIVE */
@media (max-width: 1100px) {
  #mainLayout {
    grid-template-columns: 1fr;
  }
  aside { max-height: none; }
  #leftPanel, #rightPanel {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }
  #leftPanel .panel, #rightPanel .panel {
    flex: 1;
    min-width: 240px;
  }
  .crt-bezel { max-width: 100%; }
  #screen { max-width: 100%; height: auto; }
}