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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: #f5f5f5;
  height: 100dvh;
  overflow: hidden;
}

.container {
  display: flex;
  height: 100dvh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 300px;
  background-color: #2d3748;
  color: white;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.sidebar-header {
  padding: 1rem;
  border-bottom: 1px solid #4a5568;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.sidebar-actions {
  display: flex;
  gap: 0.5rem;
}

.sidebar-actions button {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
  font-size: 1rem;
  transition: background-color 0.2s;
}

.sidebar-actions button:hover {
  background-color: #4a5568;
}

.file-tree {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.file-item {
  padding: 0.5rem;
  cursor: pointer;
  border-radius: 4px;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background-color 0.2s;
}

.file-item:hover {
  background-color: #4a5568;
}

.file-item.selected {
  background-color: #3182ce;
}

.file-item.drag-target {
  background-color: #2b6cb0;
  outline: 1px dashed #90cdf4;
}

.file-item.dragging-file {
  opacity: 0.55;
}

.file-item.directory {
  font-weight: 600;
}

.file-item.root-drop {
  border: 1px dashed #4a5568;
  margin-bottom: 0.5rem;
}

.file-icon {
  font-size: 1rem;
}

.loading {
  padding: 1rem;
  text-align: center;
  color: #a0aec0;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: white;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.editor-header {
  padding: 1rem;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #f7fafc;
}

.file-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.runtime-hint {
  font-size: 0.75rem;
  color: #718096;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 0.2rem 0.45rem;
  white-space: nowrap;
}

#current-file {
  font-weight: 600;
  color: #2d3748;
}

.save-status {
  font-size: 0.875rem;
  color: #718096;
}

.save-status.saved {
  color: #38a169;
}

.save-status.unsaved {
  color: #e53e3e;
}

.mode-toggle {
  display: inline-flex;
  border: 1px solid #cbd5e0;
  border-radius: 8px;
  overflow: hidden;
}

.mode-btn {
  border: none;
  background: #edf2f7;
  color: #4a5568;
  padding: 0.45rem 0.8rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.mode-btn + .mode-btn {
  border-left: 1px solid #cbd5e0;
}

.mode-btn.active {
  background: #3182ce;
  color: white;
}

.editor-actions {
  display: flex;
  gap: 0.5rem;
}

.editor-actions button {
  padding: 0.5rem 1rem;
  border: 1px solid #e2e8f0;
  background-color: white;
  color: #4a5568;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.editor-actions button:hover:not(:disabled) {
  background-color: #f7fafc;
  border-color: #cbd5e0;
}

.editor-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.editor-actions button:not(:disabled):active {
  background-color: #edf2f7;
}

.run-main-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  color: #374151;
  background: white;
  white-space: nowrap;
}

.run-main-toggle input[type="checkbox"] {
  margin: 0;
}

.editor-container {
  flex: 1;
  position: relative;
  min-height: 0;
  overflow: hidden;
}

.hidden {
  display: none !important;
}

.completion-dropdown {
  position: absolute;
  z-index: 30;
  display: none;
  min-width: 220px;
  max-width: 420px;
  max-height: 220px;
  overflow-y: auto;
  background: #ffffff;
  border: 1px solid #cbd5e0;
  border-radius: 6px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
}

.completion-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 13px;
}

.completion-item:hover,
.completion-item.active {
  background: #ebf8ff;
}

.completion-name {
  color: #1a202c;
}

.completion-type {
  color: #718096;
  font-size: 12px;
}

.tabs {
  display: flex;
  gap: 4px;
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid #e2e8f0;
  background: #f8fafc;
  overflow-x: auto;
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.6rem;
  border: 1px solid #cbd5e0;
  border-radius: 6px;
  background: white;
  color: #2d3748;
  cursor: pointer;
  white-space: nowrap;
}

.tab.active {
  border-color: #3182ce;
  background: #ebf8ff;
}

.tab-title {
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tab-close {
  border: none;
  background: transparent;
  color: #718096;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
}

.tab-close:hover {
  color: #e53e3e;
}

#editor {
  width: 100%;
  height: 100%;
  border: none;
  outline: none;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 14px;
  line-height: 1.5;
  padding: 1rem;
  resize: none;
}

/* CodeMirror 6 styling */
.cm-editor {
  height: 100%;
  font-size: 14px;
  line-height: 1.5;
}

.cm-focused {
  outline: none;
}

.console-container {
  height: 220px;
  border-top: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  background: #0f172a;
}

.led-sim-panel {
  border-top: 1px solid #e2e8f0;
  background: #111827;
  color: #e5e7eb;
  padding: 0.75rem;
}

.led-sim-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.led-sim-header h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.led-sim-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.led-sim-actions button {
  padding: 0.3rem 0.65rem;
  border: 1px solid #374151;
  background: #1f2937;
  color: #e5e7eb;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
}

.led-sim-actions button:hover:not(:disabled) {
  background: #243244;
}

.led-sim-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.led-meta {
  margin-top: 0.5rem;
  color: #9ca3af;
  font-size: 0.82rem;
}

.led-grid {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  overflow-x: hidden;
  overflow-y: auto;
  gap: 8px;
  width: 100%;
  max-height: 132px;
  padding: 0.1rem 0 0.2rem;
}

.led-grid.panel-mode {
  display: grid;
  grid-template-columns: repeat(16, minmax(0, 24px));
  grid-auto-rows: 24px;
  justify-content: start;
  align-content: start;
  gap: 6px;
  max-height: 470px;
  overflow: auto;
}

.led {
  width: 24px;
  height: 24px;
  min-width: 24px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.45);
}

.console-header {
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  color: #cbd5e1;
  border-bottom: 1px solid #1e293b;
}

.console-output {
  flex: 1;
  margin: 0;
  padding: 0.75rem;
  overflow: auto;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 13px;
  line-height: 1.45;
  color: #e2e8f0;
  white-space: pre-wrap;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background-color: white;
  margin: 15% auto;
  padding: 2rem;
  border-radius: 8px;
  width: 400px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.modal-content h3 {
  margin-bottom: 1rem;
  color: #2d3748;
}

.modal-content input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.modal-content input:focus {
  outline: none;
  border-color: #3182ce;
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.modal-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.modal-actions button {
  padding: 0.5rem 1rem;
  border: 1px solid #e2e8f0;
  background-color: white;
  color: #4a5568;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.modal-actions button:hover {
  background-color: #f7fafc;
  border-color: #cbd5e0;
}

.modal-actions button:first-child {
  background-color: #3182ce;
  color: white;
  border-color: #3182ce;
}

.modal-actions button:first-child:hover {
  background-color: #2c5aa0;
  border-color: #2c5aa0;
}

/* Responsive design */
@media (max-width: 768px) {
  body {
    height: 100dvh;
    overflow: hidden;
  }

  .container {
    flex-direction: column;
    height: 100dvh;
    overflow: hidden;
  }

  .sidebar {
    width: 100%;
    max-height: 30vh;
    min-height: 170px;
  }

  .sidebar-header {
    padding: 0.7rem 0.8rem;
  }

  .file-tree {
    min-height: 100px;
  }

  .main-content {
    min-height: 0;
  }

  .editor-header {
    padding: 0.65rem;
    flex-wrap: wrap;
    gap: 0.55rem;
    align-items: stretch;
  }

  .file-info {
    width: 100%;
    justify-content: space-between;
  }

  .mode-toggle {
    order: 3;
  }

  .editor-actions {
    width: 100%;
    order: 4;
    flex-wrap: wrap;
  }

  .editor-actions button {
    flex: 1 1 100px;
  }

  .run-main-toggle {
    width: 100%;
    justify-content: flex-start;
    flex: 1 1 100%;
  }

  .tabs {
    padding: 0.3rem 0.35rem;
  }

  .tab-title {
    max-width: 150px;
  }

  .editor-container {
    min-height: 46vh;
  }

  .cm-editor {
    font-size: 13px;
  }
  
  .modal-content {
    width: 90%;
    margin: 20% auto;
  }

  .led-grid {
    max-height: 120px;
  }

  .led-sim-header {
    flex-wrap: wrap;
    align-items: center;
  }

  .led-sim-actions {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .console-container {
    height: 180px;
  }
}

/* Scrollbar styling */
.file-tree::-webkit-scrollbar {
  width: 6px;
}

.file-tree::-webkit-scrollbar-track {
  background: #2d3748;
}

.file-tree::-webkit-scrollbar-thumb {
  background: #4a5568;
  border-radius: 3px;
}

.file-tree::-webkit-scrollbar-thumb:hover {
  background: #718096;
}