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

:root {
  --bg: #0a0a1a;
  --bg2: #111128;
  --panel-bg: rgba(15, 15, 40, 0.9);
  --green: #33ff33;
  --amber: #ffaa00;
  --cyan: #00ffcc;
  --red: #ff3355;
  --text: #c0c0d0;
  --text-dim: #606080;
  --border: #2a2a4a;
  --key-bg: #2a2a3a;
  --key-top: #3a3a50;
  --key-active: #4a4a6a;
}

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

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

header {
  text-align: center;
  padding: 12px 0 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
}

header h1 {
  font-family: 'Press Start 2P', monospace;
  font-size: 22px;
  color: var(--green);
  text-shadow: 0 0 20px rgba(51, 255, 51, 0.5), 0 0 40px rgba(51, 255, 51, 0.2);
  letter-spacing: 4px;
}

header .subtitle {
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 2px;
  display: block;
  margin-top: 4px;
}

#main-layout {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

#left-panel {
  width: 260px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#center-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#upload-panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
}

#drop-zone {
  border: 2px dashed var(--border);
  border-radius: 4px;
  padding: 15px 10px;
  text-align: center;
  transition: border-color 0.2s;
  cursor: pointer;
}

#drop-zone:hover, #drop-zone.dragover { border-color: var(--cyan); }
#drop-zone .drop-icon { font-size: 28px; margin-bottom: 4px; }
#drop-zone p { font-size: 11px; color: var(--text-dim); }
#drop-zone p.small { font-size: 9px; margin-top: 2px; }

#file-info {
  margin-top: 8px;
  font-size: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

#file-info span {
  background: var(--bg2);
  padding: 2px 6px;
  border-radius: 3px;
}

#file-status.success { color: var(--green); }
#file-status.error { color: var(--red); }

.hidden { display: none !important; }

.btn {
  background: var(--key-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 12px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { background: var(--key-top); border-color: var(--text-dim); }
.btn:active { transform: translateY(1px); }
.btn-green { color: var(--green); border-color: rgba(51,255,51,0.3); }
.btn-green:hover { background: rgba(51,255,51,0.1); }
.btn-amber { color: var(--amber); border-color: rgba(255,170,0,0.3); }
.btn-amber:hover { background: rgba(255,170,0,0.1); }
.btn-small { padding: 3px 8px; font-size: 10px; }

.btn-active-charset {
  color: var(--cyan) !important;
  border-color: var(--cyan) !important;
  background: rgba(0, 255, 204, 0.1) !important;
}

#controls {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

#speed-display {
  font-size: 10px;
  color: var(--cyan);
  margin-left: auto;
}

#debug-toggle-bar {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font-size: 10px;
}

.panel h3 {
  color: var(--amber);
  font-size: 10px;
  margin: 6px 0 4px;
  font-weight: 500;
}
.panel h3:first-child { margin-top: 0; }

#registers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px 8px;
}

#registers .reg { display: flex; gap: 4px; }
#registers .reg label { color: var(--text-dim); }
#registers .reg span { color: var(--green); font-weight: 700; }
#registers .flags { grid-column: 1 / -1; }
#registers .flags span { font-family: 'IBM Plex Mono', monospace; letter-spacing: 1px; }

#disasm {
  font-size: 10px;
  line-height: 1.5;
  color: var(--text-dim);
  max-height: 150px;
  overflow-y: auto;
}
#disasm .current { color: var(--green); font-weight: 700; }

#memory-view {
  font-size: 9px;
  line-height: 1.5;
  color: var(--text-dim);
  max-height: 100px;
  overflow-y: auto;
  white-space: pre;
  font-family: 'IBM Plex Mono', monospace;
}

#mem-addr, #bp-addr {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--cyan);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  width: 50px;
  padding: 2px 4px;
  border-radius: 3px;
  text-transform: uppercase;
}

.bp-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 6px;
}
.bp-row label { color: var(--text-dim); font-size: 10px; }
#bp-status { color: var(--amber); font-size: 9px; }

/* Character ROM Viewer */
.charrom-toggle-row {
  display: flex;
  gap: 4px;
  margin-bottom: 6px;
}

#charrom-canvas {
  display: block;
  width: 192px;
  height: 128px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: #0a0a1a;
}

.charrom-info {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  font-size: 9px;
  color: var(--text-dim);
}

.charrom-info span:first-child { color: var(--cyan); }

.charrom-rom-info {
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px solid var(--border);
}
.charrom-rom-detail {
  font-size: 8px;
  color: var(--text-dim);
  line-height: 1.6;
  letter-spacing: 0.3px;
}
.charrom-rom-detail:first-child {
  color: var(--amber);
}

/* Memory Map */
.memmap-entry {
  font-size: 9px;
  padding: 1px 0;
  color: var(--text-dim);
}
.memmap-entry .addr {
  color: var(--cyan);
  display: inline-block;
  width: 100px;
}
.memmap-entry.highlight {
  color: var(--green);
  font-weight: 500;
}
.memmap-entry.highlight .addr {
  color: var(--green);
  text-shadow: 0 0 6px rgba(51, 255, 51, 0.3);
}
.memmap-entry.rom-section {
  color: var(--amber);
}
.memmap-entry.rom-section .addr {
  color: var(--amber);
  text-shadow: 0 0 6px rgba(255, 170, 0, 0.3);
}
.memmap-entry.rom-charset {
  color: var(--cyan);
  font-weight: 500;
}
.memmap-entry.rom-charset .addr {
  color: var(--cyan);
  text-shadow: 0 0 6px rgba(0, 255, 204, 0.3);
}

/* CRT */
#crt-bezel {
  background: #1a1a2a;
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 0 30px rgba(0,0,0,0.8), inset 0 0 20px rgba(0,0,0,0.5);
  border: 2px solid #2a2a3a;
}

#crt-screen {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 0 15px rgba(51,255,51,0.15), inset 0 0 30px rgba(0,0,0,0.8);
}

#screen {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  width: 480px;
  height: 448px;
}

.scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 1px,
    rgba(0, 0, 0, 0.15) 1px,
    rgba(0, 0, 0, 0.15) 2px
  );
  pointer-events: none;
}

.crt-vignette {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,0.6) 100%);
  pointer-events: none;
}

#crt-label {
  text-align: center;
  font-size: 9px;
  color: var(--text-dim);
  margin-top: 6px;
  letter-spacing: 2px;
}

/* Keyboard */
#keyboard {
  margin-top: 10px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  user-select: none;
}

.kb-row {
  display: flex;
  justify-content: center;
  gap: 3px;
}

.key {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 30px;
  padding: 0 6px;
  background: linear-gradient(180deg, var(--key-top) 0%, var(--key-bg) 100%);
  border: 1px solid #444;
  border-bottom: 2px solid #222;
  border-radius: 4px;
  color: #ccc;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.08s;
  box-shadow: 0 2px 3px rgba(0,0,0,0.4);
}

.key:hover { background: linear-gradient(180deg, #555 0%, #444 100%); }

.key.pressed {
  transform: translateY(2px);
  box-shadow: 0 0 2px rgba(0,0,0,0.4);
  background: linear-gradient(180deg, var(--key-bg) 0%, #222 100%);
  border-bottom-width: 1px;
  color: var(--green);
}

.key.space { min-width: 180px; }
.key.return { min-width: 60px; }
.key.shift { min-width: 50px; }
.key.ctrl, .key.funct, .key.del, .key.esc { min-width: 38px; font-size: 8px; }

footer {
  text-align: center;
  margin-top: 16px;
  padding: 10px;
  border-top: 1px solid var(--border);
}
footer a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 10px;
  transition: color 0.2s;
}
footer a:hover { color: var(--cyan); }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

@media (max-width: 900px) {
  #main-layout {
    flex-direction: column;
    align-items: center;
  }
  #left-panel {
    width: 100%;
    max-width: 500px;
    order: 2;
  }
  #center-panel { order: 1; }
  #screen { width: 100%; height: auto; }
  #crt-bezel { width: 100%; max-width: 504px; }
  .key { min-width: 24px; height: 26px; font-size: 8px; }
  .key.space { min-width: 120px; }
}