:root {
  --bg-primary: #0a0a14;
  --bg-secondary: #0d0d1a;
  --bg-panel: #0f0f20;
  --bg-gutter: #0a0a18;
  --green: #00ff41;
  --green-dim: #00cc34;
  --green-dark: #004d13;
  --amber: #ffb000;
  --amber-dim: #cc8d00;
  --red: #ff3333;
  --red-bg: rgba(255,51,51,0.1);
  --cyan: #00e5ff;
  --magenta: #ff00ff;
  --white: #c0c0c0;
  --white-bright: #e0e0e0;
  --comment-color: #5a6a4a;
  --border-color: #1a1a30;
  --border-highlight: #2a2a50;
  --font-mono: 'Fira Code', 'Courier New', monospace;
  --font-display: 'Share Tech Mono', 'Fira Code', monospace;
}

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

html, body {
  height: 100%;
  background: var(--bg-primary);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 13px;
  overflow: hidden;
}

#root { height: 100%; }

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
}

/* Dot grid background */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: -1;
  background-image: radial-gradient(circle, rgba(0,255,65,0.03) 1px, transparent 1px);
  background-size: 20px 20px;
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-highlight); border-radius: 0; }
::-webkit-scrollbar-thumb:hover { background: var(--green-dark); }
::-webkit-scrollbar-corner { background: var(--bg-primary); }

/* Header */
.header {
  background: linear-gradient(180deg, #0f0f25 0%, var(--bg-primary) 100%);
  border-bottom: 2px solid var(--green-dark);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.header-title {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--green);
  text-shadow: 0 0 10px rgba(0,255,65,0.5), 0 0 20px rgba(0,255,65,0.3);
  letter-spacing: 3px;
  white-space: nowrap;
}

.header-chip {
  display: inline-block;
  background: var(--green-dark);
  color: var(--green);
  font-size: 9px;
  padding: 2px 6px;
  border: 1px solid var(--green-dim);
  letter-spacing: 1px;
  white-space: nowrap;
}

.header-tagline {
  font-size: 11px;
  color: var(--comment-color);
  font-style: italic;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-spacer { flex: 1; }

.header-ascii {
  font-size: 10px;
  color: var(--green-dark);
  white-space: pre;
  line-height: 1.1;
  display: none;
}

@media (min-width: 900px) {
  .header-ascii { display: block; }
}

/* Toolbar */
.toolbar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 6px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.btn {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 5px 12px;
  border: 2px solid var(--green-dark);
  background: transparent;
  color: var(--green);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.1s;
  white-space: nowrap;
}

.btn:hover {
  background: var(--green);
  color: var(--bg-primary);
  text-shadow: none;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  border-color: var(--green);
  text-shadow: 0 0 8px rgba(0,255,65,0.4);
  box-shadow: 0 0 8px rgba(0,255,65,0.2);
}

.btn-danger {
  border-color: var(--red);
  color: var(--red);
}
.btn-danger:hover {
  background: var(--red);
  color: var(--bg-primary);
}

.btn-amber {
  border-color: var(--amber);
  color: var(--amber);
}
.btn-amber:hover {
  background: var(--amber);
  color: var(--bg-primary);
}

.btn-cyan {
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn-cyan:hover {
  background: var(--cyan);
  color: var(--bg-primary);
}

.toolbar-select {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 5px 8px;
  border: 2px solid var(--border-highlight);
  background: var(--bg-primary);
  color: var(--green);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

.toolbar-input {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 5px 8px;
  border: 2px solid var(--border-highlight);
  background: var(--bg-primary);
  color: var(--amber);
  width: 70px;
  text-transform: uppercase;
}

.toolbar-input:focus, .toolbar-select:focus {
  outline: none;
  border-color: var(--green);
}

.toolbar-label {
  font-size: 10px;
  color: var(--comment-color);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border-color);
  margin: 0 4px;
}

/* Main layout */
.main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

/* Editor panel */
.editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-right: 2px solid var(--border-color);
  min-width: 0;
}

.panel-header {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  color: var(--comment-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.editor-wrapper {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.line-numbers {
  width: 40px;
  padding: 8px 4px;
  background: var(--bg-gutter);
  border-right: 1px solid var(--border-color);
  text-align: right;
  font-size: 11px;
  color: #333355;
  line-height: 1.5;
  overflow: hidden;
  user-select: none;
  flex-shrink: 0;
}

.line-numbers .error-line {
  color: var(--red);
  font-weight: bold;
}

.editor-textarea {
  flex: 1;
  padding: 8px;
  background: transparent;
  border: none;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  resize: none;
  outline: none;
  overflow: auto;
  tab-size: 8;
  -moz-tab-size: 8;
  white-space: pre;
}

.editor-textarea::placeholder {
  color: var(--comment-color);
}

/* Output panel */
.output-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.output-content {
  flex: 1;
  overflow: auto;
  padding: 8px;
  font-size: 12px;
  line-height: 1.5;
}

.listing-line {
  display: flex;
  gap: 0;
  white-space: pre;
}

.listing-addr {
  color: var(--amber);
  width: 50px;
  flex-shrink: 0;
  text-align: right;
  padding-right: 8px;
}

.listing-bytes {
  color: var(--cyan);
  width: 120px;
  flex-shrink: 0;
}

.listing-source {
  color: var(--white);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.listing-error {
  color: var(--red);
  flex: 1;
}

.listing-line-error {
  background: var(--red-bg);
}

.listing-comment {
  color: var(--comment-color);
}

.listing-directive {
  color: var(--magenta);
}

/* Summary */
.summary {
  border-top: 1px solid var(--border-color);
  padding: 6px 12px;
  font-size: 11px;
  background: var(--bg-secondary);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.summary-item {
  color: var(--comment-color);
}
.summary-value {
  color: var(--green);
}
.summary-error {
  color: var(--red);
}

/* Error console */
.error-console {
  border-top: 2px solid var(--border-color);
  background: var(--bg-secondary);
  flex-shrink: 0;
  max-height: 150px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.error-console-header {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 4px 12px;
  background: var(--bg-gutter);
  border-bottom: 1px solid var(--border-color);
  color: var(--comment-color);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  user-select: none;
}

.error-console-header:hover {
  color: var(--green);
}

.error-console-body {
  overflow: auto;
  padding: 4px 12px;
  font-size: 11px;
  flex: 1;
}

.error-item {
  padding: 2px 0;
  cursor: pointer;
  color: var(--red);
}

.error-item:hover {
  text-decoration: underline;
}

.warning-item {
  color: var(--amber);
}

.error-badge {
  background: var(--red);
  color: var(--bg-primary);
  padding: 0 6px;
  font-size: 10px;
  font-weight: bold;
}

.ok-badge {
  background: var(--green-dark);
  color: var(--green);
  padding: 0 6px;
  font-size: 10px;
}

/* Hex dump */
.hex-dump-line {
  white-space: pre;
  line-height: 1.5;
}

.hex-addr {
  color: var(--amber);
}

.hex-byte {
  color: var(--cyan);
}

.hex-ascii {
  color: var(--green-dim);
}

/* Footer */
.footer {
  background: var(--bg-gutter);
  border-top: 1px solid var(--border-color);
  padding: 4px 12px;
  font-size: 9px;
  color: #333355;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.footer a {
  color: var(--green-dark);
  text-decoration: none;
}
.footer a:hover {
  color: var(--green);
  text-decoration: underline;
}

/* App container */
.app-container {
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 40px;
  right: 20px;
  background: var(--green-dark);
  color: var(--green);
  padding: 8px 16px;
  border: 2px solid var(--green);
  font-family: var(--font-mono);
  font-size: 12px;
  z-index: 10000;
  animation: toast-in 0.3s ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
  .main-container {
    flex-direction: column;
  }
  .editor-panel {
    border-right: none;
    border-bottom: 2px solid var(--border-color);
    flex: none;
    height: 40vh;
  }
  .output-panel {
    flex: 1;
  }
  .listing-bytes {
    width: 90px;
  }
  .header-tagline { display: none; }
  .toolbar { gap: 4px; }
  .btn { padding: 4px 8px; font-size: 10px; }
}