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

:root {
  --green: #33ff33;
  --green-dim: #22aa22;
  --green-glow: rgba(51, 255, 51, 0.3);
  --green-dark: #115511;
  --bg: #0a0a0a;
  --bg-panel: #111111;
  --border: #33ff33;
  --btn-bg: #222;
  --btn-border: #555;
  --kb-housing: #c8b88a;
  --kb-housing-light: #d4c89e;
  --kb-housing-dark: #a89868;
  --kb-key-bg: #b8c4d4;
  --kb-key-bg-light: #c8d0de;
  --kb-key-bg-dark: #a0aab8;
  --kb-key-text: #1a1a2a;
  --kb-key-graphic: #3355aa;
  --kb-key-red: #cc2222;
  --kb-key-red-hover: #b01e1e;
  --kb-key-red-active: #991919;
  --key-size: 42px;
  --key-gap: 4px;
  --ieee-active: #ff6622;
  --ieee-idle: #555;
}

body {
  background: var(--bg);
  color: var(--green);
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

#app {
  width: 100%;
  max-width: 1060px;
  padding: 16px;
}

header {
  text-align: center;
  margin-bottom: 12px;
}

h1 {
  font-size: 2.2rem;
  letter-spacing: 4px;
  text-shadow: 0 0 20px var(--green-glow), 0 0 40px var(--green-glow);
  color: var(--green);
}

.subtitle {
  font-size: 0.85rem;
  color: var(--green-dim);
  margin-top: 2px;
}

#status-bar {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 8px;
  font-size: 0.72rem;
  color: var(--green-dim);
  flex-wrap: wrap;
}

#status-bar span {
  padding: 2px 8px;
  border: 1px solid #333;
}

#control-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  padding: 8px;
  border: 1px solid #333;
  background: var(--bg-panel);
}

.ctrl-btn {
  font-family: inherit;
  font-size: 0.8rem;
  color: var(--green);
  background: var(--btn-bg);
  border: 2px outset var(--btn-border);
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.1s;
}

.ctrl-btn:hover {
  background: #2a2a2a;
  color: #55ff55;
  box-shadow: 0 0 8px var(--green-glow);
}

.ctrl-btn:active { border-style: inset; }
.ctrl-btn.sm { padding: 3px 8px; font-size: 0.7rem; }

.power-btn {
  background: #1a0000;
  border-color: #883333;
  color: #ff5555;
}

.power-btn.on {
  background: #001a00;
  border-color: #33aa33;
  color: var(--green);
  box-shadow: 0 0 12px var(--green-glow);
}

.matrix-btn {
  margin-left: auto;
  font-size: 0.7rem;
  padding: 4px 10px;
}

.matrix-btn.active {
  background: #002200;
  border-color: var(--green);
  box-shadow: 0 0 10px var(--green-glow);
}

.ram-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
}

.ram-selector select {
  font-family: inherit;
  font-size: 0.8rem;
  color: var(--green);
  background: #1a1a1a;
  border: 1px solid #444;
  padding: 4px;
}

#crt-container {
  position: relative;
  margin: 0 auto 0;
  border-radius: 16px 16px 4px 4px;
  overflow: hidden;
  border: 3px solid #333;
  box-shadow: 0 0 30px var(--green-glow), 0 0 60px rgba(51, 255, 51, 0.1), inset 0 0 60px rgba(0,0,0,0.5);
  background: #000;
  display: flex;
  justify-content: center;
}

#screen {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  image-rendering: pixelated;
}

#scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.12) 2px,
    rgba(0, 0, 0, 0.12) 3px
  );
  pointer-events: none;
}

/* ============================================================ */
/* PHOTO-ACCURATE CHICLET KEYBOARD HOUSING                      */
/* ============================================================ */

#keyboard-housing {
  background: linear-gradient(180deg, var(--kb-housing-light) 0%, var(--kb-housing) 30%, var(--kb-housing-dark) 100%);
  border-radius: 0 0 12px 12px;
  padding: 14px 16px 18px;
  margin: 0 auto 16px;
  box-shadow:
    0 4px 12px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.3),
    inset 0 -2px 4px rgba(0,0,0,0.15);
  border: 1px solid #a09070;
  border-top: none;
  position: relative;
}

#keyboard-housing::before {
  content: '';
  position: absolute;
  top: 0; left: 8px; right: 8px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
}

#keyboard-container {
  display: flex;
  gap: 24px;
  justify-content: center;
  align-items: start;
}

/* ---- Base chiclet key ---- */
.kb-key {
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  font-size: 0.62rem;
  font-weight: 700;
  width: var(--key-size);
  height: var(--key-size);
  min-width: var(--key-size);
  max-width: var(--key-size);
  min-height: var(--key-size);
  max-height: var(--key-size);
  padding: 2px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  user-select: none;
  line-height: 1.1;
  white-space: pre-line;
  position: relative;
  border: none;
  outline: none;
  overflow: hidden;
  background: linear-gradient(180deg, #ccd4e0 0%, var(--kb-key-bg) 40%, #a8b0c0 100%);
  color: var(--kb-key-text);
  border-radius: 5px;
  box-shadow:
    0 2px 0 #8890a0,
    0 3px 4px rgba(0,0,0,0.25),
    inset 0 1px 0 rgba(255,255,255,0.5),
    inset 0 -1px 0 rgba(0,0,0,0.08);
  transition: all 0.06s ease;
}

.kb-key .key-graphic {
  font-size: 0.5rem;
  color: var(--kb-key-graphic);
  line-height: 1;
  opacity: 0.8;
}

.kb-key .key-main {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--kb-key-text);
  line-height: 1.05;
  overflow: hidden;
}

/* Two-line keys get smaller text to stay square */
.kb-key.two-line-key .key-main {
  font-size: 0.52rem;
  line-height: 1.05;
}

.kb-key:hover {
  background: linear-gradient(180deg, #c0c8d6 0%, #aab2c4 40%, #9aa2b4 100%);
}

.kb-key:active, .kb-key.active {
  background: linear-gradient(180deg, #a0a8b8 0%, #9098aa 40%, #8890a0 100%);
  box-shadow:
    0 0 0 #8890a0,
    0 1px 2px rgba(0,0,0,0.2),
    inset 0 2px 3px rgba(0,0,0,0.1);
  transform: translateY(2px);
}

/* ---- RED special keys ---- */
.kb-key.red-key {
  background: linear-gradient(180deg, #e02828 0%, var(--kb-key-red) 40%, #aa1a1a 100%);
  color: #fff;
  box-shadow:
    0 2px 0 #881414,
    0 3px 4px rgba(0,0,0,0.3),
    inset 0 1px 0 rgba(255,255,255,0.3),
    inset 0 -1px 0 rgba(0,0,0,0.15);
}

.kb-key.red-key .key-main {
  color: #fff;
}

.kb-key.red-key .key-graphic {
  color: rgba(255,255,255,0.7);
}

.kb-key.red-key:hover {
  background: linear-gradient(180deg, #d42222 0%, var(--kb-key-red-hover) 40%, #991616 100%);
}

.kb-key.red-key:active, .kb-key.red-key.active {
  background: linear-gradient(180deg, #b01e1e 0%, var(--kb-key-red-active) 40%, #801212 100%);
  box-shadow:
    0 0 0 #881414,
    0 1px 2px rgba(0,0,0,0.3),
    inset 0 2px 3px rgba(0,0,0,0.15);
  transform: translateY(2px);
}

/* Two-line red keys also get small text */
.kb-key.red-key.two-line-key .key-main {
  font-size: 0.52rem;
  line-height: 1.05;
  color: #fff;
}

/* ---- SPACE BAR ---- */
.kb-key.space-key {
  width: auto;
  max-width: none;
  min-width: unset;
  height: var(--key-size);
  min-height: var(--key-size);
  max-height: var(--key-size);
}

/* ---- RETURN key — SINGLE CONNECTED DOUBLE-HEIGHT KEY ---- */
.kb-key.return-key {
  width: var(--key-size);
  min-width: var(--key-size);
  max-width: var(--key-size);
  height: calc(var(--key-size) * 2 + var(--key-gap));
  min-height: calc(var(--key-size) * 2 + var(--key-gap));
  max-height: calc(var(--key-size) * 2 + var(--key-gap));
  padding: 4px 2px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kb-key.return-key .return-label {
  font-size: 0.68rem;
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: 0;
  color: #fff;
  text-align: center;
}

/* ---- Matrix tooltip ---- */
.kb-key .matrix-tooltip {
  display: none;
  position: absolute;
  bottom: 105%;
  left: 50%;
  transform: translateX(-50%);
  background: #000;
  border: 1px solid var(--green);
  color: var(--green);
  font-size: 0.5rem;
  padding: 2px 5px;
  white-space: nowrap;
  z-index: 100;
  pointer-events: none;
  border-radius: 3px;
  font-weight: normal;
}

.kb-key:hover .matrix-tooltip {
  display: block;
}

/* Keyboard Matrix Panel */
#kbd-matrix-panel {
  margin-bottom: 8px;
}

.matrix-panel-header {
  background: #0a1a0a;
  color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
  cursor: default !important;
}

#matrix-info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 0.72rem;
  color: var(--green-dim);
}

#matrix-info-bar b {
  color: var(--green);
  font-size: 0.8rem;
}

#matrix-grid-container {
  overflow-x: auto;
  margin-bottom: 8px;
}

#matrix-grid {
  border-collapse: collapse;
  font-size: 0.6rem;
  width: 100%;
}

#matrix-grid th, #matrix-grid td {
  border: 1px solid #333;
  padding: 3px 4px;
  text-align: center;
  min-width: 60px;
  font-family: inherit;
}

#matrix-grid th {
  background: #1a1a1a;
  color: var(--green-dim);
  font-weight: normal;
  line-height: 1.3;
}

#matrix-grid td {
  background: #0a0a0a;
  color: #555;
  position: relative;
  height: 28px;
  transition: background 0.05s, color 0.05s;
}

#matrix-grid td.key-label {
  font-size: 0.55rem;
  color: #666;
}

#matrix-grid td.cell-pressed {
  background: #004400;
  color: var(--green);
  text-shadow: 0 0 4px var(--green-glow);
  box-shadow: inset 0 0 6px rgba(51, 255, 51, 0.2);
}

#matrix-grid td.cell-scanned {
  border-color: var(--green-dim);
}

#matrix-grid tr.row-active td {
  border-top: 1px solid var(--green);
  border-bottom: 1px solid var(--green);
}

#matrix-grid tr.row-active td:first-child {
  background: #003300;
  color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
}

@keyframes row-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

#matrix-grid tr.row-active td:first-child {
  animation: row-pulse 0.3s ease-in-out infinite;
}

#matrix-port-readback {
  font-size: 0.75rem;
  color: var(--green-dim);
  margin-top: 4px;
}

#matrix-bits {
  font-family: inherit;
  letter-spacing: 3px;
}

.bit-high { color: #555; }
.bit-low { color: var(--green); text-shadow: 0 0 4px var(--green-glow); font-weight: bold; }

/* ============================================================ */
/* IEEE-488 BUS MONITOR                                         */
/* ============================================================ */

#ieee-monitor-panel {
  margin-bottom: 8px;
}

#ieee-info-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 0.72rem;
  color: var(--green-dim);
}

.ieee-lines-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.ieee-line-label {
  color: var(--green-dim);
  font-weight: bold;
  font-size: 0.7rem;
}

.ieee-line {
  padding: 2px 8px;
  border: 1px solid #333;
  border-radius: 3px;
  font-size: 0.7rem;
  color: var(--ieee-idle);
  background: #0a0a0a;
  transition: all 0.1s;
}

.ieee-line b {
  color: inherit;
  margin-left: 2px;
}

.ieee-line.ieee-active {
  color: var(--ieee-active);
  border-color: var(--ieee-active);
  background: #1a0800;
  text-shadow: 0 0 4px rgba(255, 102, 34, 0.4);
}

.ieee-data {
  padding: 2px 8px;
  border: 1px solid #333;
  border-radius: 3px;
  font-size: 0.7rem;
  color: #88aaff;
  background: #0a0a0a;
  font-family: inherit;
}

#ieee-state-text {
  color: var(--green);
  font-weight: bold;
}

#ieee-talker, #ieee-listener {
  color: var(--ieee-active);
  font-weight: bold;
}

#ieee-log-container {
  margin-bottom: 8px;
}

.ieee-log-title {
  color: var(--green-dim);
  font-size: 0.72rem;
  margin-bottom: 4px;
  font-weight: bold;
}

#ieee-log {
  height: 150px;
  overflow-y: auto;
  font-size: 0.62rem;
  color: #88aacc;
  line-height: 1.3;
}

#ieee-devices-container {
  margin-top: 8px;
}

.ieee-dev-entry {
  display: flex;
  gap: 10px;
  padding: 3px 6px;
  border: 1px solid #222;
  margin-bottom: 2px;
  font-size: 0.7rem;
  align-items: center;
}

.ieee-dev-num {
  color: var(--green);
  font-weight: bold;
  min-width: 30px;
}

.ieee-dev-name {
  color: #aaa;
  min-width: 60px;
}

.ieee-dev-state {
  color: var(--ieee-idle);
  min-width: 80px;
}

.ieee-dev-state.ieee-dev-active {
  color: var(--ieee-active);
  text-shadow: 0 0 4px rgba(255, 102, 34, 0.3);
}

.ieee-dev-disk {
  color: #666;
}

/* IEEE LED indicators in peripheral tabs */
.ieee-device-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.75rem;
}

.ieee-device-controls label {
  color: var(--green-dim);
}

.dev-select {
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--green);
  background: #1a1a1a;
  border: 1px solid #444;
  padding: 2px 6px;
}

.ieee-led {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #333;
  border: 1px solid #555;
  transition: all 0.15s;
}

.ieee-led.active {
  background: var(--ieee-active);
  box-shadow: 0 0 6px var(--ieee-active), 0 0 12px rgba(255, 102, 34, 0.3);
  border-color: var(--ieee-active);
}

.ieee-dev-state {
  font-size: 0.7rem;
  color: var(--ieee-idle);
}

.ieee-error {
  font-size: 0.68rem;
  color: #cc8844;
  font-style: italic;
}

/* Panels */
.panel {
  border: 1px solid #333;
  margin-bottom: 8px;
  background: var(--bg-panel);
}

.panel-header {
  padding: 8px 12px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--green);
  border-bottom: 1px solid #222;
  user-select: none;
}

.panel-header:hover { background: #1a1a1a; }

.panel-body {
  display: none;
  padding: 10px 12px;
}

.panel-body.open { display: block; }

.panel-info {
  font-size: 0.75rem;
  color: var(--green-dim);
  margin-bottom: 8px;
}

.drop-zone {
  border: 2px dashed #444;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--green-dim);
  margin-bottom: 10px;
  position: relative;
  transition: border-color 0.2s;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--green);
  color: var(--green);
}

.drop-zone input {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  opacity: 0;
  cursor: pointer;
}

.rom-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 4px;
  font-size: 0.72rem;
}

.rom-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 6px;
  border: 1px solid #222;
}

.rom-item.loaded { border-color: var(--green-dark); }

.rom-check { font-size: 1rem; }
.rom-check.ok { color: var(--green); }
.rom-check.missing { color: #ff4444; }

.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-bottom: 8px;
}

.tab-btn {
  font-family: inherit;
  font-size: 0.7rem;
  color: var(--green-dim);
  background: #1a1a1a;
  border: 1px solid #333;
  padding: 4px 10px;
  cursor: pointer;
}

.tab-btn.active {
  color: var(--green);
  background: #222;
  border-bottom-color: var(--green);
}

.tab-content { display: none; font-size: 0.8rem; }
.tab-content.active { display: block; }
.tab-content p { margin-bottom: 8px; color: var(--green-dim); }
.tab-content input[type="file"] { margin-bottom: 8px; }

.file-info {
  font-size: 0.75rem;
  color: var(--green-dim);
  padding: 4px;
  margin: 6px 0;
}

.debug-section {
  margin-bottom: 8px;
  font-size: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.debug-section b { color: #55ff55; margin-left: 2px; }
.debug-section .flags { color: #888; font-size: 0.65rem; }

.mono-box {
  background: #000;
  border: 1px solid #222;
  padding: 6px;
  font-size: 0.7rem;
  min-height: 40px;
  white-space: pre;
  overflow-x: auto;
  display: block;
  line-height: 1.4;
}

.hex-input {
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--green);
  background: #1a1a1a;
  border: 1px solid #444;
  padding: 2px 6px;
  width: 50px;
  text-transform: uppercase;
}

.pia-watch {
  flex-direction: column;
  align-items: flex-start;
}

.pia-title {
  color: var(--green);
  font-size: 0.75rem;
  margin-bottom: 4px;
  text-shadow: 0 0 4px var(--green-glow);
}

.pia-watch .mono-box {
  width: 100%;
  font-size: 0.68rem;
}

footer {
  text-align: center;
  margin-top: 20px;
  padding: 12px;
  font-size: 0.75rem;
}

footer a {
  color: var(--green-dim);
  text-decoration: none;
}

footer a:hover {
  color: var(--green);
  text-decoration: underline;
}

@keyframes crt-on {
  0% { opacity: 0; transform: scaleY(0.01); }
  40% { opacity: 0.8; transform: scaleY(0.5); }
  50% { opacity: 0.3; transform: scaleY(1); }
  70% { opacity: 0.9; transform: scaleY(1); }
  100% { opacity: 1; transform: scaleY(1); }
}

#crt-container.power-on #screen {
  animation: crt-on 0.6s ease-out;
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 30px var(--green-glow), 0 0 60px rgba(51, 255, 51, 0.1), inset 0 0 60px rgba(0,0,0,0.5); }
  50% { box-shadow: 0 0 40px var(--green-glow), 0 0 80px rgba(51, 255, 51, 0.15), inset 0 0 60px rgba(0,0,0,0.5); }
}

#crt-container.power-on {
  animation: glow-pulse 3s ease-in-out infinite;
}

@media (max-width: 800px) {
  :root {
    --key-size: 28px;
    --key-gap: 2px;
  }
  #app { padding: 8px; }
  h1 { font-size: 1.4rem; letter-spacing: 2px; }
  #keyboard-housing { padding: 8px 6px 12px; }
  #keyboard-container { gap: 10px; }
  .kb-key .key-main { font-size: 0.48rem; }
  .kb-key .key-graphic { font-size: 0.32rem; }
  .kb-key.two-line-key .key-main { font-size: 0.36rem; }
  .kb-key.red-key.two-line-key .key-main { font-size: 0.36rem; }
  .kb-key.return-key .return-label { font-size: 0.42rem; }
  #control-panel { gap: 4px; }
  .ctrl-btn { padding: 4px 8px; font-size: 0.7rem; }
  .rom-grid { grid-template-columns: 1fr; }
  #matrix-grid td, #matrix-grid th { min-width: 40px; font-size: 0.5rem; padding: 2px; }
  #matrix-info-bar { font-size: 0.6rem; gap: 6px; }
  .ieee-line { font-size: 0.6rem; padding: 1px 4px; }
  .ieee-lines-group { gap: 4px; }
  #ieee-log { height: 100px; font-size: 0.55rem; }
}