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

:root {
  --phosphor: #33FF33;
  --phosphor-dim: #1a8a1a;
  --phosphor-bright: #66FF66;
  --bg-dark: #0a0a0a;
  --bg-panel: #111;
  --bg-page: #1a1a1a;
  --bezel: #8a8a8a;
  --bezel-dark: #555;
  --text-dim: #666;
}

body {
  background: var(--bg-page);
  color: var(--phosphor);
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 10px;
}

header {
  text-align: center;
  padding: 15px 0 10px;
}

.radio-shack-badge {
  font-family: 'VT323', monospace;
  color: #999;
  font-size: 12px;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 2px;
}

h1 {
  font-family: 'VT323', monospace;
  font-size: 42px;
  color: var(--phosphor);
  text-shadow: 0 0 20px var(--phosphor-dim), 0 0 40px rgba(51,255,51,0.3);
  letter-spacing: 3px;
}

.subtitle {
  font-size: 13px;
  color: var(--phosphor-dim);
  letter-spacing: 2px;
}

#main-layout {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

#left-panel {
  flex: 1;
  min-width: 0;
}

#right-panel {
  width: 380px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

#monitor-bezel {
  background: linear-gradient(145deg, #999 0%, #777 30%, #888 50%, #666 100%);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.8), inset 0 1px 0 rgba(255,255,255,0.2);
}

#screen-container {
  position: relative;
  background: var(--bg-dark);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: inset 0 0 30px rgba(0,0,0,0.9), inset 0 0 5px rgba(51,255,51,0.1);
}

#canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
}

#scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 2px,
    rgba(0,0,0,0.15) 2px,
    rgba(0,0,0,0.15) 4px
  );
  pointer-events: none;
}

#controls {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
  align-items: center;
}

.ctrl-btn {
  font-family: 'Share Tech Mono', monospace;
  font-size: 13px;
  color: var(--phosphor);
  background: #222;
  border: 1px solid #444;
  border-radius: 4px;
  padding: 6px 12px;
  cursor: pointer;
  transition: all 0.1s;
  white-space: nowrap;
}

.ctrl-btn:hover {
  background: #333;
  border-color: var(--phosphor-dim);
  text-shadow: 0 0 6px var(--phosphor);
}

.ctrl-btn:active {
  background: #111;
  transform: translateY(1px);
}

.ctrl-btn.active {
  background: var(--phosphor-dim);
  color: #000;
}

.ctrl-btn.small {
  padding: 4px 8px;
  font-size: 11px;
}

.ctrl-input {
  font-family: 'Share Tech Mono', monospace;
  font-size: 13px;
  color: var(--phosphor);
  background: #1a1a1a;
  border: 1px solid #444;
  border-radius: 4px;
  padding: 6px 8px;
}

.hex-input {
  width: 55px;
  text-transform: uppercase;
}

.addr-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.addr-group label {
  font-size: 11px;
  color: var(--phosphor-dim);
}

.file-label {
  display: inline-block;
}

#file-info {
  font-size: 11px;
  color: var(--phosphor-dim);
  margin-top: 4px;
  min-height: 16px;
}

.toast {
  position: fixed;
  bottom: 60px;
  left: 50%;
  transform: translateX(-50%);
  background: #222;
  border: 1px solid var(--phosphor-dim);
  color: var(--phosphor);
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 13px;
  z-index: 1000;
  transition: opacity 0.3s;
  text-shadow: 0 0 6px var(--phosphor-dim);
}

.toast.hidden { opacity: 0; pointer-events: none; }

/* Panels */
.panel-section {
  background: var(--bg-panel);
  border: 1px solid #333;
  border-radius: 6px;
  overflow: hidden;
}

.panel-header {
  padding: 6px 10px;
  font-size: 12px;
  color: var(--phosphor-dim);
  background: #1a1a1a;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  user-select: none;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.panel-header:hover {
  color: var(--phosphor);
}

.toggle-icon {
  transition: transform 0.2s;
}

.panel-header.collapsed .toggle-icon {
  transform: rotate(-90deg);
}

.panel-content {
  padding: 8px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 12px;
  line-height: 1.5;
  max-height: 300px;
  overflow-y: auto;
  overflow-x: hidden;
}

.panel-content.collapsed {
  display: none;
}

#memory-controls {
  display: flex;
  gap: 4px;
  padding: 4px 8px;
  background: #1a1a1a;
  border-bottom: 1px solid #333;
}

#memory {
  font-size: 11px;
  line-height: 1.4;
  white-space: pre;
}

#registers {
  white-space: pre;
}

#disasm {
  white-space: pre;
  font-size: 11px;
}

.reg-changed {
  color: #FFD700 !important;
  text-shadow: 0 0 6px rgba(255,215,0,0.5);
}

.disasm-current {
  background: rgba(51,255,51,0.15);
  display: block;
}

.mem-rom { color: #8888FF; }
.mem-ram { color: #AAAAAA; }
.mem-vram { color: var(--phosphor); }
.mem-hiram { color: #888; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #111; }
::-webkit-scrollbar-thumb { background: #444; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--phosphor-dim); }

footer {
  text-align: center;
  padding: 15px;
  font-size: 12px;
  color: var(--phosphor-dim);
  margin-top: 15px;
  border-top: 1px solid #333;
}

footer a {
  color: var(--phosphor);
  text-decoration: none;
  margin-left: 20px;
}

footer a:hover {
  text-shadow: 0 0 8px var(--phosphor);
}

select.ctrl-input {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='5'%3E%3Cpath d='M0 0l4 5 4-5z' fill='%2333ff33'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
}

@media (max-width: 900px) {
  #main-layout {
    flex-direction: column;
  }
  #right-panel {
    width: 100%;
    max-height: none;
  }
}