/* Turing Machine Widget Styles */
/* Matches the dark theme of the interactive papers platform */

.tm-widget {
  background: var(--surface, #161b22);
  border: 1px solid var(--border, #30363d);
  border-radius: 8px;
  padding: 1.2em;
  margin: 1.5em 0;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 14px;
  color: var(--text, #c9d1d9);
}

.tm-header {
  margin-bottom: 1em;
}

.tm-name {
  font-weight: 700;
  color: var(--heading, #e6edf3);
  font-size: 1.1em;
}

.tm-desc {
  display: block;
  margin-top: 0.3em;
  color: var(--text-muted, #8b949e);
  font-size: 0.9em;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* State display */
.tm-state-display {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4em;
  margin-bottom: 1em;
  padding: 0.6em 0.8em;
  background: var(--bg, #0d1117);
  border-radius: 6px;
  font-size: 0.95em;
}

.tm-label {
  color: var(--text-muted, #8b949e);
  font-size: 0.85em;
}

.tm-state-value {
  color: var(--accent, #58a6ff);
  font-weight: 700;
  font-size: 1.1em;
}

.tm-symbol-value {
  color: #f0883e;
  font-weight: 700;
  font-size: 1.1em;
}

/* Tape */
.tm-tape-container {
  overflow-x: auto;
  margin: 1em 0;
  padding: 0.5em 0;
  scrollbar-width: thin;
  scrollbar-color: #30363d transparent;
}

.tm-tape {
  display: flex;
  min-width: min-content;
  justify-content: center;
}

.tm-head-row {
  display: flex;
  min-width: min-content;
  justify-content: center;
}

.tm-cell {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #30363d;
  font-size: 1.1em;
  font-weight: 600;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.tm-f-square {
  background: rgba(88, 166, 255, 0.06);
}

.tm-e-square {
  background: rgba(255, 255, 255, 0.02);
  color: #8b949e;
}

.tm-cell.tm-head {
  border-color: var(--accent, #58a6ff);
  background: rgba(88, 166, 255, 0.15);
  color: #e6edf3;
  box-shadow: 0 0 8px rgba(88, 166, 255, 0.3);
}

.tm-marker {
  width: 36px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.8em;
  color: transparent;
}

.tm-head-marker {
  color: var(--accent, #58a6ff) !important;
}

/* Output sequence */
.tm-output {
  margin: 0.8em 0;
  padding: 0.5em 0.8em;
  background: var(--bg, #0d1117);
  border-radius: 6px;
  font-size: 0.95em;
}

.tm-output-value {
  color: #7ee787;
  font-weight: 600;
  font-size: 1.05em;
  letter-spacing: 0.05em;
}

/* Controls */
.tm-controls {
  display: flex;
  gap: 0.5em;
  margin: 1em 0 0.5em;
  flex-wrap: wrap;
}

.tm-btn {
  background: #21262d;
  color: var(--text, #c9d1d9);
  border: 1px solid #30363d;
  border-radius: 6px;
  padding: 0.4em 1em;
  font-size: 0.9em;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.tm-btn:hover:not(:disabled) {
  background: #30363d;
  border-color: #484f58;
}

.tm-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.tm-btn.tm-active {
  background: rgba(88, 166, 255, 0.15);
  border-color: var(--accent, #58a6ff);
  color: var(--accent, #58a6ff);
}

/* Step counter */
.tm-counter {
  color: var(--text-muted, #8b949e);
  font-size: 0.85em;
  margin-top: 0.3em;
}

/* State table display (for showing Turing's original tables alongside) */
.tm-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.9em;
}

.tm-table th {
  color: var(--text-muted, #8b949e);
  font-weight: 600;
  text-align: left;
  padding: 0.5em 0.8em;
  border-bottom: 1px solid #30363d;
  font-style: italic;
}

.tm-table td {
  padding: 0.4em 0.8em;
  border-bottom: 1px solid rgba(48, 54, 61, 0.5);
  color: var(--text, #c9d1d9);
}

.tm-table tr.tm-active-row {
  background: rgba(88, 166, 255, 0.1);
}

.tm-table td:first-child {
  color: var(--accent, #58a6ff);
  font-weight: 600;
}

/* Responsive */
@media (max-width: 600px) {
  .tm-widget { padding: 0.8em; font-size: 13px; }
  .tm-cell { width: 28px; height: 28px; font-size: 1em; }
  .tm-marker { width: 28px; }
  .tm-controls { gap: 0.3em; }
  .tm-btn { padding: 0.3em 0.7em; font-size: 0.85em; }
}