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

    body {
      font-family: 'Consolas', 'Monaco', 'Lucida Console', monospace;
      background: #1a1a1a;
      color: #e0e0e0;
      height: 100vh;
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    #controls {
      background: linear-gradient(135deg, #2d2d2d, #404040);
      padding: 8px 12px;
      border-bottom: 2px solid #4a9eff;
      display: flex;
      gap: 10px;
      align-items: center;
      flex-wrap: wrap;
      box-shadow: 0 2px 10px rgba(0,0,0,0.3);
      height: 50px; /* Fixed height for controls */
    }

    button, .dropdown-btn {
      padding: 8px 16px;
      border: none;
      border-radius: 6px;
      background: linear-gradient(135deg, #4a9eff, #357abd);
      color: white;
      cursor: pointer;
      font-family: inherit;
      font-size: 12px;
      font-weight: 500;
      transition: all 0.2s;
      box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    }
    
    .dropdown-btn {
        padding: 6px 12px;
    }

    button:hover, .dropdown:hover .dropdown-btn {
      background: linear-gradient(135deg, #3a8eef, #2a6aa0);
      transform: translateY(-1px);
    }

    button:active, .dropdown-btn:active {
      transform: translateY(0);
    }

    button:disabled {
      background: #555;
      cursor: not-allowed;
      transform: none;
    }

    /* Dropdown Menu Styles */
    .dropdown {
        position: relative;
        display: inline-block;
    }

    .dropdown-content {
        display: none;
        position: absolute;
        background-color: #3c3c3c;
        min-width: 160px;
        box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.3);
        z-index: 1001;
        border-radius: 4px;
        overflow: hidden;
        border: 1px solid #555;
    }

    .dropdown-content a {
        color: #e0e0e0;
        padding: 10px 14px;
        text-decoration: none;
        display: block;
        font-size: 12px;
        transition: background-color 0.2s;
    }

    .dropdown-content a:hover {
        background-color: #4a9eff;
        color: white;
    }

    .dropdown:hover .dropdown-content {
        display: block;
    }

    .button-group {
      display: flex;
      gap: 5px;
      align-items: center;
    }

    select {
      padding: 6px 10px;
      border: 1px solid #555;
      border-radius: 4px;
      background: #333;
      color: #e0e0e0;
      font-family: inherit;
      font-size: 11px;
    }

    .toggle-switch {
      position: relative;
      display: inline-block;
      width: 44px;
      height: 24px;
      margin: 0 8px;
    }

    .toggle-switch input {
      opacity: 0;
      width: 0;
      height: 0;
    }

    .slider {
      position: absolute;
      cursor: pointer;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: #555;
      transition: .4s;
      border-radius: 24px;
    }

    .slider:before {
      position: absolute;
      content: "";
      height: 18px;
      width: 18px;
      left: 3px;
      bottom: 3px;
      background-color: white;
      transition: .4s;
      border-radius: 50%;
    }

    input:checked + .slider {
      background-color: #4a9eff;
    }

    input:checked + .slider:before {
      transform: translateX(20px);
    }

    #main {
      flex: 1;
      display: flex;
      height: calc(100vh - 50px);
      min-height: 0;
    }

    /* Side Navigation Panel */
    #sideNav {
        width: 60px;
        background: #252526;
        padding: 10px 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 10px;
        border-right: 1px solid #333;
    }
    .side-nav-btn {
        background: transparent;
        color: #ccc;
        border: none;
        padding: 10px 5px;
        width: 100%;
        cursor: pointer;
        border-radius: 3px;
        font-size: 11px;
        font-weight: bold;
        text-align: center;
        transition: all 0.2s ease;
        border-left: 3px solid transparent;
    }
    .side-nav-btn:hover {
        background: #3a3a3a;
        color: white;
    }
    .side-nav-btn.active {
        background: #094771;
        color: white;
        border-left: 3px solid #4a9eff;
    }


    .splitter-horizontal, .splitter-vertical {
      background: #333;
      cursor: col-resize;
      position: relative;
      user-select: none;
    }

    .splitter-horizontal {
      width: 4px;
      cursor: col-resize;
    }

    .splitter-vertical {
      height: 4px;
      cursor: row-resize;
      
    }

    .splitter-horizontal:hover, .splitter-vertical:hover {
      background: #4a9eff;
    }

    #leftPane {
      flex: 1;
      display: flex;
      flex-direction: column;
      min-width: 300px;
    }

    #editorSection {
      flex: 1;
      display: flex;
      min-height: 400px;
      height: 100%;
    }
    #assemblyEditorWrapper, #machineEditorWrapper {
        position: relative;
        height: 100%;
        display: flex;
        flex-direction: column;
        flex: 1;
        min-height: 0; /* IMPORTANT: Allow flex children to shrink correctly */
    }

    #assemblyEditor {
      flex: 6;
      display: flex;
      flex-direction: column;
      min-width: 150px;

    }

    #machineCodeView {
      flex: 4;
      display: flex;
      flex-direction: column;
      min-width: 150px;
    }

    .editor-header {
      background: #333;
      padding: 8px 12px;
      font-weight: bold;
      font-size: 12px;
      border-bottom: 1px solid #444;
      display: flex;
      justify-content: space-between;
      align-items: center;
    flex-shrink: 0; /* Prevent header from shrinking */
    }

    .editor-container {
      flex: 1;
      position: relative;
      background: #1e1e1e;
      min-height: 0;
      display: flex;
      flex-direction: column;
    }

    #codeTextarea, #machineCodeTextarea {
      position: relative;
      width: 100%;
      height: 100%;
      background: transparent;
      color: #d4d4d4;
      border: none;
      padding: 10px;
      font-family: inherit;
      font-size: 13px;
      line-height: 18px;
      resize: none;
      outline: none;
      tab-size: 4;
      box-sizing: border-box; /* Add consistent box-sizing */
      position: relative;
      z-index: 2; /* Above overlay and background */
      overflow: auto;
      flex: 1;
      min-height: 0;
      overflow-y: auto;
      overflow-x: auto;
    }


    .line-numbers {
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 40px;
      background: #252525;
      border-right: 1px solid #444;
      padding: 10px 5px;
      font-size: 13px;
      line-height: 18px;
      color: #666;
      user-select: none;
      overflow: hidden;
      z-index: 3; /* Above everything */
    }

    .line-numbers .line-number {
      text-align: right;
      cursor: pointer;
      padding-right: 5px;
      position: relative;
    }

    .line-number.breakpoint {
      background: #dc3545;
      color: white;
      border-radius: 2px;
    }

    .line-number.breakpoint:before {
      content: "●";
      position: absolute;
      right: -8px;
      color: #dc3545;
    }

    #codeTextarea {
      padding-left: 50px;
      
    }

    .overlay-container {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      pointer-events: none;
      z-index: 1;
      overflow: hidden; /* Do not scroll */
    }
    
    #highlightOverlay {
      position: absolute;
      top: 0;
      left:0;
      /*left: 50px;*/
      right: 0;
      bottom: 0;
      pointer-events: none;
      padding: 10px;
      font-family: inherit;
      font-size: 13px;
      line-height: 18px;
      overflow: hidden;
      z-index: 1; /* Behind textarea & above background*/
      box-sizing: border-box;
    }

    #machineEditorWrapper {
      position: relative;
      height: 100%;
    }

    .highlightLine {
      position: absolute;
      left: 0;
      right: 0;
      height: 18px; /* Match line-height */
      background-color: rgba(255, 255, 0, 0.4); /* highlight color */
      background: rgba(255, 255, 0, 0.2);
      border-left: 3px solid #ffff00;
    }

    .breakpointLine {
      position: absolute;
      left: 0;
      right: 0;
      background: rgba(220, 53, 69, 0.1);
      height: 18px; /* Match line-height */
      border-left: 3px solid #dc3545;
    }

    #consoleOutput {
      height: 180px;
      background: #0d1117;
      color: #58a6ff;
      padding: 10px;
      overflow-y: scroll;
      border-top: 1px solid #444;
      font-size: 12px;
      white-space: pre-wrap;
      font-family: 'Courier New', monospace;
    }

    #rightPane {
      width: 400px;
      display: flex;
      flex-direction: column;
      background: #252525;
      min-width: 200px;
    }

    .panel {
      flex: 1;
      display: flex;
      flex-direction: column;
      border-bottom: 1px solid #444;
      min-height: 150px;
    }

    .panel:last-child {
      border-bottom: none;
    }

    .panel-header {
      background: linear-gradient(135deg, #333, #404040);
      padding: 8px 12px;
      font-weight: bold;
      font-size: 12px;
      border-bottom: 1px solid #444;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: grab;
    }

    .panel-content {
      flex: 1;
      overflow-x: auto;
      overflow-y: auto;
      padding: 8px;
      background: #1e1e1e;
    }

    #registerTable {
      width: 100%;
      border-collapse: collapse;
      font-size: 15px;
    }

    #registerTable th,
    #registerTable td {
      padding: 4px 8px;
      text-align: left;
      border-bottom: 1px solid #333;
    }

    #registerTable th {
      background: #2d2d2d;
      font-weight: bold;
      position: sticky;
      top: 0;
    }

    .register-zero {
      color: #666;
    }

    .register-nonzero {
      color: #4fc3f7;
    }

    .highlight-change {
      animation: flash 1s ease-in-out;
    }

    @keyframes flash {
      0% { background-color: rgba(255, 165, 0, 0.7); }
      100% { background-color: transparent; }
    }

    #stackView ul {
      list-style: none;
      margin: 0;
      padding: 0;
    }

    #stackView li {
      padding: 4px 8px;
      border-bottom: 1px solid #333;
      font-size: 11px;
      position: relative;
      padding-left: 20px;
    }

    #stackView li:before {
      content: "└";
      position: absolute;
      left: 8px;
      color: #666;
    }

    .memory-grid {
      display: grid;
      grid-template-columns: auto repeat(16, 1fr);
      gap: 1px;
      font-size: 10px;
      background: #333;
      border-radius: 4px;
      overflow: hidden;
    }

    .memory-address {
      background: #2d2d2d;
      padding: 4px 6px;
      text-align: right;
      color: #888;
      font-weight: bold;
      font-family: 'Courier New', monospace;
    }

    .memory-byte {
      background: #1a1a1a;
      padding: 4px 2px;
      text-align: center;
      min-width: 20px;
      cursor: pointer;
      transition: all 0.2s;
      font-family: 'Courier New', monospace;
    }

    .memory-byte:hover {
      background: #3a3a3a;
      transform: scale(1.1);
    }

    .memory-byte.changed {
      background: rgba(255, 165, 0, 0.3);
      animation: pulse 1s ease-in-out;
    }

    .memory-byte.zero {
      color: #666;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.05); }
    }

    .cache-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 10px;
    }

    .cache-table th,
    .cache-table td {
      padding: 4px 6px;
      text-align: left;
      border-bottom: 1px solid #333;
      font-family: 'Courier New', monospace;
    }

    .cache-table th {
      background: #2d2d2d;
      font-weight: bold;
      position: sticky;
      top: 0;
    }

    .cache-hit {
      color: #4caf50;
    }

    .cache-miss {
      color: #f44336;
    }

    .cache-dirty {
      background: rgba(255, 165, 0, 0.2);
    }

    .panel-controls {
      display: flex;
      gap: 5px;
      align-items: center;
    }

    .panel-controls button {
      padding: 2px 8px;
      font-size: 10px;
    }

    .memory-ascii {
      grid-column: span 16;
      background: #0d1117;
      padding: 4px 6px;
      font-size: 9px;
      color: #aaa;
      font-family: 'Courier New', monospace;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 10px;
      margin-bottom: 10px;
    }

    .stat-card {
      background: #2d2d2d;
      padding: 8px;
      border-radius: 4px;
      text-align: center;
    }

    .stat-value {
      font-size: 18px;
      font-weight: bold;
      color: #4a9eff;
    }

    .stat-label {
      font-size: 10px;
      color: #aaa;
      margin-top: 2px;
    }

    .resizer {
      background: transparent;
      position: absolute;
    }

    .resizer.horizontal {
      height: 4px;
      cursor: row-resize;
      bottom: -2px;
      left: 0;
      right: 0;
    }

    .resizer.vertical {
      width: 4px;
      cursor: col-resize;
      top: 0;
      bottom: 0;
      right: -2px;
    }

    .loading {
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100%;
      color: #666;
      font-style: italic;
    }

    .tooltip {
      position: relative;
    }

    .tooltip:hover:after {
      content: attr(data-tooltip);
      position: absolute;
      bottom: 125%;
      left: 50%;
      transform: translateX(-50%);
      background: #333;
      color: white;
      padding: 4px 8px;
      border-radius: 4px;
      font-size: 10px;
      white-space: nowrap;
      z-index: 1000;
    }

    .side-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.nav-icon {
    font-size: 16px
}

#rightPane {
  display: flex;
  flex-direction: column;
}

#registersView {
  flex: 1; 
  min-height: 0;
  overflow: auto;
}


/* Make bottom pane split horizontally */
#bottomPane {
  display: flex;
  height: 180px; /* same as original consoleOutput height */
  background: #0d1117;
  border-top: 1px solid #444;
  overflow: hidden;
}

#consoleOutput {
  flex: 2; /* 75% width */
  padding: 10px;
  overflow-y: auto;
  font-size: 12px;
  white-space: pre-wrap;
  font-family: 'Courier New', monospace;
  color: #58a6ff;
  border-right: 1px solid #333;
}

#callstackView {
  flex: 2; /* 25% width */
  padding: 10px;
  overflow-y: auto;
  font-size: 12px;
  font-family: 'Courier New', monospace;
  color: #ccc;
  background: #1e1e1e;
}

/* Optional: distinguish callstack style */
#callstackView ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

#callstackView li {
  padding: 4px 6px;
  border-bottom: 1px solid #333;
  font-size: 11px;
}