*, *::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;
}

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: 920px;
  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: 0.9rem;
  color: var(--green-dim);
  margin-top: 2px;
}

#status-bar {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--green-dim);
}

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

/* Control Panel */
#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);
}

.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 */
#crt-container {
  position: relative;
  margin: 0 auto 16px;
  border-radius: 16px;
  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;
}

/* 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 */
.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 */
.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; }

/* Tabs */
.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 */
.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;
}

/* Keyboard */
#keyboard-container {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  align-items: center;
}

.kb-row {
  display: flex;
  gap: 3px;
  align-items: center;
}

.kb-row .kb-sep {
  width: 12px;
}

.kb-key {
  font-family: inherit;
  font-size: 0.65rem;
  min-width: 36px;
  height: 32px;
  padding: 2px 4px;
  background: #2a2a2a;
  color: #ccc;
  border: 2px outset #555;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  user-select: none;
  line-height: 1.1;
  white-space: nowrap;
}

.kb-key:hover {
  background: #3a3a3a;
  color: #fff;
}

.kb-key:active, .kb-key.active {
  border-style: inset;
  background: #444;
}

.kb-key.wide { min-width: 56px; }
.kb-key.xwide { min-width: 80px; }
.kb-key.space { min-width: 200px; }
.kb-key.special { background: #333; color: var(--green-dim); }

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;
}

/* CRT flicker animation */
@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;
}

/* Responsive */
@media (max-width: 700px) {
  #app { padding: 8px; }
  h1 { font-size: 1.4rem; letter-spacing: 2px; }
  .kb-key { min-width: 26px; height: 26px; font-size: 0.5rem; }
  .kb-key.wide { min-width: 38px; }
  .kb-key.xwide { min-width: 54px; }
  .kb-key.space { min-width: 120px; }
  #control-panel { gap: 4px; }
  .ctrl-btn { padding: 4px 8px; font-size: 0.7rem; }
  .rom-grid { grid-template-columns: 1fr; }
}