:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0f1018;
  --bg-panel: #111520;
  --bg-panel-header: #161b2a;
  --border: #1e2640;
  --border-bright: #2a3555;
  --green: #00ff88;
  --green-dim: #00cc6a;
  --amber: #ffaa00;
  --cyan: #00ddff;
  --magenta: #ff44cc;
  --red: #ff3355;
  --text-primary: #c8d0e0;
  --text-dim: #5a6580;
  --text-bright: #e8eef8;
  --q0: #3a3f50;
  --q1: #00ddff;
  --q2: #ffaa00;
  --q3: #ff44cc;
}

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

html, body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  height: 100%;
  overflow: hidden;
}

#root { height: 100%; }

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-bright); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #3a4565; }

.glow-green { text-shadow: 0 0 8px #00ff88aa, 0 0 20px #00ff8833; }
.glow-amber { text-shadow: 0 0 8px #ffaa00aa, 0 0 20px #ffaa0033; }

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.panel-header {
  background: var(--bg-panel-header);
  border-bottom: 1px solid var(--border);
  padding: 4px 8px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 26px;
  flex-shrink: 0;
  user-select: none;
}

.panel-body {
  flex: 1;
  overflow: auto;
  padding: 4px;
  min-height: 0;
}

.led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.1);
  flex-shrink: 0;
}

.led-on-green { background: var(--green); box-shadow: 0 0 6px var(--green); }
.led-on-amber { background: var(--amber); box-shadow: 0 0 6px var(--amber); }
.led-on-red { background: var(--red); box-shadow: 0 0 6px var(--red); }
.led-off { background: #1a1f30; }

.retro-btn {
  background: linear-gradient(180deg, #252b3d, #1a1f30);
  border: 1px solid var(--border-bright);
  color: var(--text-primary);
  padding: 3px 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
  flex-shrink: 0;
  min-height: 24px;
}

.retro-btn:hover {
  background: linear-gradient(180deg, #303850, #252b3d);
  border-color: var(--green);
  color: var(--green);
}

.retro-btn:active {
  transform: translateY(1px);
  background: linear-gradient(180deg, #1a1f30, #151a28);
}

.retro-btn.active {
  border-color: var(--green);
  color: var(--green);
  box-shadow: 0 0 6px rgba(0,255,136,0.2);
}

.retro-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.retro-btn.load-btn {
  background: linear-gradient(180deg, #3a2a00, #2a1f00);
  border-color: var(--amber);
  color: var(--amber);
  text-shadow: 0 0 6px rgba(255,170,0,0.4);
  animation: load-pulse 2s ease-in-out infinite;
}
.retro-btn.load-btn:hover {
  background: linear-gradient(180deg, #4a3a10, #3a2f10);
  border-color: #ffcc44;
  color: #ffcc44;
  box-shadow: 0 0 12px rgba(255,170,0,0.4);
}

@keyframes load-pulse {
  0%, 100% { box-shadow: 0 0 4px rgba(255,170,0,0.2); }
  50% { box-shadow: 0 0 10px rgba(255,170,0,0.5); }
}

.terminal {
  background: #050508;
  color: var(--green);
  font-family: 'Share Tech Mono', 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.4;
  padding: 8px;
  white-space: pre-wrap;
  word-break: break-all;
  cursor: text;
  position: relative;
}

.terminal::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.06) 2px,
    rgba(0,0,0,0.06) 4px
  );
  pointer-events: none;
}

.cursor-blink { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

@keyframes flash-register {
  0% { background: rgba(255,170,0,0.4); }
  100% { background: transparent; }
}
.reg-flash { animation: flash-register 0.5s ease-out; }

@keyframes pulse-led {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.led-pulse { animation: pulse-led 1s ease-in-out infinite; }

.asm-editor {
  background: #08090e;
  color: var(--text-primary);
  border: none;
  outline: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  line-height: 1.5;
  resize: none;
  width: 100%;
  padding: 6px;
  tab-size: 8;
  min-height: 0;
  flex: 1;
}

.mem-cell {
  cursor: pointer;
  padding: 0 1px;
  border-radius: 2px;
  transition: background 0.15s;
  display: inline-block;
}

.mem-cell:hover { background: rgba(0,255,136,0.15); }

.sound-canvas {
  background: #08090e;
  border: 1px solid var(--border);
  border-radius: 2px;
  display: block;
}

.tooltip-wrap { position: relative; }
.tooltip-text {
  visibility: hidden;
  background: #1a1f30;
  border: 1px solid var(--border-bright);
  color: var(--text-bright);
  font-size: 9px;
  padding: 3px 6px;
  position: absolute;
  z-index: 100;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  border-radius: 3px;
  margin-bottom: 4px;
  pointer-events: none;
}
.tooltip-wrap:hover .tooltip-text { visibility: visible; }

.toolbar {
  background: var(--bg-panel-header);
  border-bottom: 1px solid var(--border);
  padding: 4px 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 36px;
}

.workspace-desktop {
  display: grid;
  grid-template-columns: 240px 1fr 1fr 220px;
  grid-template-rows: 1fr 1fr;
  gap: 3px;
  padding: 3px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.workspace-desktop > .panel-registers { grid-row: 1; grid-column: 1; }
.workspace-desktop > .panel-assembler { grid-row: 1; grid-column: 2; }
.workspace-desktop > .panel-terminal { grid-row: 1 / 3; grid-column: 3; }
.workspace-desktop > .panel-memory { grid-row: 2; grid-column: 1; }
.workspace-desktop > .panel-sound { grid-row: 2; grid-column: 2; }
.workspace-desktop > .panel-floppy { grid-row: 1 / 3; grid-column: 4; }

.mobile-tabs {
  display: none;
  background: var(--bg-panel-header);
  border-bottom: 1px solid var(--border);
  gap: 2px;
  padding: 3px;
  flex-shrink: 0;
}

.mobile-tabs .retro-btn { flex: 1; justify-content: center; font-size: 9px; padding: 4px 2px; }

.mobile-content {
  display: none;
  flex: 1;
  padding: 3px;
  min-height: 0;
  overflow: hidden;
}

.status-bar {
  background: var(--bg-panel-header);
  border-top: 1px solid var(--border);
  padding: 2px 8px;
  font-size: 9px;
  display: flex;
  gap: 12px;
  color: var(--text-dim);
  flex-shrink: 0;
  flex-wrap: wrap;
  min-height: 20px;
  align-items: center;
}

.trace-log {
  font-size: 9px;
  color: var(--text-dim);
  max-height: 50px;
  overflow: auto;
  border-top: 1px solid var(--border);
  padding: 2px 4px;
  background: var(--bg-secondary);
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .workspace-desktop { display: none !important; }
  .mobile-tabs { display: flex !important; }
  .mobile-content { display: flex !important; }
  .toolbar { flex-wrap: wrap; min-height: auto; padding: 3px 6px; gap: 3px; }
  .toolbar-title { display: none; }
  .toolbar-sep { display: none; }
  .toolbar-right { display: none; }
  .status-bar { font-size: 8px; gap: 6px; }
}

@media (min-width: 901px) {
  .workspace-desktop { display: grid !important; }
  .mobile-tabs { display: none !important; }
  .mobile-content { display: none !important; }
}

.error-bar {
  background: rgba(255,51,85,0.15);
  border-bottom: 1px solid var(--red);
  padding: 3px 10px;
  font-size: 10px;
  color: var(--red);
  font-weight: 700;
  flex-shrink: 0;
}

.small-select {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--green);
  font-family: inherit;
  font-size: 9px;
  padding: 2px 4px;
  border-radius: 2px;
}

.corrupt-btn:hover {
  background: linear-gradient(180deg, #3a1520, #2a0a15) !important;
  border-color: var(--red) !important;
  color: var(--red) !important;
  box-shadow: 0 0 8px rgba(255,51,85,0.3);
  text-shadow: 0 0 6px rgba(255,51,85,0.6);
}

.corrupt-btn:active {
  transform: translateY(1px);
  box-shadow: 0 0 12px rgba(255,51,85,0.5);
}

.corrupt-bar {
  background: rgba(255,51,85,0.04);
  border-radius: 3px;
}

.gfx-viewport {
  background: #050508;
  position: relative;
}

.gfx-viewport::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0,0,0,0.04) 3px,
    rgba(0,0,0,0.04) 4px
  );
  pointer-events: none;
}

.gfx-canvas {
  box-shadow: 0 0 20px rgba(0,255,136,0.08), 0 0 40px rgba(0,255,136,0.03);
}

.small-input {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--green);
  font-family: inherit;
  font-size: 9px;
  padding: 2px 4px;
  width: 60px;
  border-radius: 2px;
}

/* Loader dialog overlay */
.loader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.loader-dialog {
  background: var(--bg-panel);
  border: 2px solid var(--amber);
  border-radius: 8px;
  padding: 20px;
  max-width: 520px;
  width: 90%;
  box-shadow: 0 0 40px rgba(255,170,0,0.2), 0 0 80px rgba(255,170,0,0.05);
}

.loader-dialog h2 {
  color: var(--amber);
  font-size: 14px;
  text-shadow: 0 0 8px rgba(255,170,0,0.4);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.loader-dialog .loader-info {
  color: var(--text-dim);
  font-size: 10px;
  margin-bottom: 12px;
  line-height: 1.5;
}

.loader-dialog .loader-status {
  background: #08090e;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  font-size: 10px;
  max-height: 120px;
  overflow-y: auto;
  margin-bottom: 12px;
  color: var(--green);
  line-height: 1.5;
}

.loader-dialog .loader-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.loader-dialog .loader-opt-btn {
  background: linear-gradient(180deg, #1a2030, #151a28);
  border: 1px solid var(--border-bright);
  color: var(--text-primary);
  padding: 8px 12px;
  font-family: inherit;
  font-size: 10px;
  cursor: pointer;
  border-radius: 4px;
  text-align: left;
  transition: all 0.15s;
}

.loader-dialog .loader-opt-btn:hover {
  border-color: var(--amber);
  color: var(--amber);
  background: linear-gradient(180deg, #2a2520, #1a1a18);
}

.loader-dialog .loader-opt-btn .opt-title {
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
}

.loader-dialog .loader-opt-btn .opt-desc {
  font-size: 9px;
  color: var(--text-dim);
}

.loader-actions {
  display: flex;
  gap: 6px;
  justify-content: flex-end;
}

/* Drop zone styling */
.drop-zone-active {
  border: 2px dashed var(--amber) !important;
  box-shadow: inset 0 0 30px rgba(255,170,0,0.1);
  position: relative;
}

.drop-zone-active::before {
  content: 'DROP ANY FILE TO LOAD';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10,10,15,0.9);
  color: var(--amber);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  text-shadow: 0 0 10px rgba(255,170,0,0.6);
  z-index: 50;
  animation: drop-glow 1.5s ease-in-out infinite;
}

@keyframes drop-glow {
  0%,100% { border-color: var(--amber); }
  50% { border-color: #ffcc44; }
}