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

:root {
  --green: #33ff33;
  --green-dim: #1a9a1a;
  --green-dark: #0a3a0a;
  --amber: #ffaa00;
  --red: #ff3333;
  --bg: #0a0a0a;
  --panel-bg: #111111;
  --panel-border: #222;
  --text: #aaa;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  overflow-x: hidden;
  min-height: 100vh;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 10px 20px;
}

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

header h1 {
  font-family: 'VT323', monospace;
  font-size: 52px;
  color: var(--green);
  text-shadow: 0 0 20px var(--green), 0 0 40px var(--green-dark);
  letter-spacing: 12px;
}

header p {
  font-size: 12px;
  color: var(--green-dim);
  letter-spacing: 4px;
  text-transform: uppercase;
}

#main-layout {
  display: flex;
  gap: 15px;
  margin-top: 10px;
}

#terminal-wrapper {
  flex: 1;
  min-width: 0;
}

#crt-frame {
  position: relative;
  background: #050505;
  border: 3px solid #1a1a1a;
  border-radius: 18px;
  padding: 20px;
  box-shadow: inset 0 0 60px rgba(0,0,0,0.8), 0 0 20px rgba(51,255,51,0.05);
  overflow: hidden;
}

#terminal {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  image-rendering: pixelated;
  cursor: text;
}

#crt-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  border-radius: 18px;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,0.4) 100%);
  z-index: 2;
}

#scanlines {
  position: absolute;
  top: 20px; left: 20px; right: 20px; bottom: 20px;
  pointer-events: none;
  z-index: 3;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.15) 2px,
    rgba(0,0,0,0.15) 4px
  );
  border-radius: 8px;
}

#side-panel {
  width: 340px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex-shrink: 0;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 12px;
}

.panel h3 {
  font-family: 'VT323', monospace;
  font-size: 16px;
  color: var(--green);
  margin-bottom: 10px;
  letter-spacing: 2px;
  text-shadow: 0 0 8px var(--green-dark);
}

.collapsible h3 {
  cursor: pointer;
  user-select: none;
}

.collapsed {
  display: none;
}

.reg-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 8px;
}

.reg {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #0a0a0a;
  border: 1px solid #1a1a1a;
  border-radius: 4px;
  padding: 4px;
}

.reg-wide {
  grid-column: span 2;
}

.reg-label {
  font-size: 10px;
  color: #555;
  letter-spacing: 1px;
}

.reg-val {
  font-family: 'VT323', monospace;
  font-size: 22px;
  color: var(--green);
  text-shadow: 0 0 6px var(--green-dark);
}

.flags-row {
  display: flex;
  justify-content: center;
  gap: 4px;
  flex-wrap: wrap;
}

.flag-label {
  font-size: 9px;
  color: #555;
  margin-right: 1px;
}

.flag-val {
  font-family: 'VT323', monospace;
  font-size: 16px;
  color: var(--green);
  margin-right: 8px;
  min-width: 10px;
  text-align: center;
}

.btn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 8px;
}

.ctrl-btn {
  font-family: 'VT323', monospace;
  font-size: 15px;
  letter-spacing: 1px;
  padding: 8px 12px;
  border: 1px solid #333;
  border-radius: 4px;
  background: #1a1a1a;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
  text-transform: uppercase;
}

.ctrl-btn:hover {
  background: #252525;
}

.ctrl-btn:active {
  transform: scale(0.97);
}

.ctrl-btn.green { color: var(--green); border-color: var(--green-dark); }
.ctrl-btn.green:hover { background: var(--green-dark); color: #fff; }

.ctrl-btn.red { color: var(--red); border-color: #3a1111; }
.ctrl-btn.red:hover { background: #3a1111; color: #fff; }

.ctrl-btn.amber { color: var(--amber); border-color: #3a2a00; }
.ctrl-btn.amber:hover { background: #3a2a00; color: #fff; }

.ctrl-btn.small {
  padding: 4px 10px;
  font-size: 13px;
}

.full-width { width: 100%; }

.speed-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.speed-control label {
  font-size: 11px;
  color: #555;
}

.speed-control input[type="range"] {
  flex: 1;
  accent-color: var(--green);
  height: 4px;
}

#speed-val {
  font-family: 'VT323', monospace;
  color: var(--green);
  font-size: 14px;
  min-width: 35px;
  text-align: right;
}

.load-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.load-row label {
  font-size: 11px;
  color: #555;
  min-width: 50px;
}

.load-row input[type="text"] {
  font-family: 'VT323', monospace;
  font-size: 18px;
  background: #0a0a0a;
  border: 1px solid #2a2a2a;
  border-radius: 3px;
  color: var(--green);
  padding: 4px 8px;
  width: 80px;
  text-transform: uppercase;
  text-shadow: 0 0 4px var(--green-dark);
}

.load-row input[type="text"]:focus {
  outline: none;
  border-color: var(--green-dim);
}

.file-info {
  font-size: 11px;
  color: #555;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.status-msg {
  font-size: 12px;
  margin-top: 6px;
  min-height: 16px;
  color: var(--green-dim);
}

.status-msg.error {
  color: var(--red);
}

#hex-dump, #disasm-view {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  line-height: 1.5;
  color: var(--green-dim);
  background: #080808;
  border: 1px solid #1a1a1a;
  border-radius: 3px;
  padding: 8px;
  max-height: 200px;
  overflow-y: auto;
  overflow-x: hidden;
  white-space: pre;
  margin-top: 8px;
}

#hex-dump::-webkit-scrollbar,
#disasm-view::-webkit-scrollbar {
  width: 6px;
}

#hex-dump::-webkit-scrollbar-thumb,
#disasm-view::-webkit-scrollbar-thumb {
  background: var(--green-dark);
  border-radius: 3px;
}

.hl-pc {
  background: var(--green-dark);
  color: var(--green);
}

footer {
  text-align: center;
  padding: 20px;
  margin-top: 15px;
}

footer a {
  color: var(--green-dim);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 1px;
}

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

@media (max-width: 900px) {
  #main-layout {
    flex-direction: column;
  }
  #side-panel {
    width: 100%;
  }
}

@keyframes flicker {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.98; }
}