:root {
  --primary-bg: #f4f7f9;
  --secondary-bg: #ffffff;
  --header-bg: #2c3e50;
  --header-text: #ecf0f1;
  --text-color: #34495e;
  --border-color: #dfe6e9;
  --accent-color: #3498db;
  --accent-hover: #2980b9;
  --danger-color: #e74c3c;
  --danger-hover: #c0392b;
  --hover-bg: #eaf2f8;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
}

body.dark-mode {
  --primary-bg: #2c3e50;
  --secondary-bg: #34495e;
  --header-bg: #1a252f;
  --header-text: #ecf0f1;
  --text-color: #ecf0f1;
  --border-color: #4a627a;
  --accent-color: #3498db;
  --accent-hover: #5dade2;
  --danger-color: #e74c3c;
  --danger-hover: #f1948a;
  --hover-bg: #4a627a;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  background-color: var(--primary-bg);
  color: var(--text-color);
}

header,
footer {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 0.75rem 1rem;
}

header {
  font-size: 1.2rem;
  font-weight: bold;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

main {
  flex-grow: 1;
  display: flex;
  flex-direction: row;
  overflow: hidden;
  position: relative; /* Add positioning context for the toggle button */
}

#main-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#tabs {
  display: flex;
  background-color: var(--secondary-bg);
  border-bottom: 1px solid var(--border-color);
  justify-content: flex-start;
}

#tabs button {
  border: none;
  background: none;
  cursor: pointer;
  font-size: 1rem;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease-in-out;
  margin-bottom: 0;
  color: var(--text-color);
}

#tabs button.active {
  border-bottom-color: var(--accent-color);
  font-weight: bold;
}

#tabs button.split-active-tab {
  opacity: 0.6;
  cursor: default;
  pointer-events: none; /* Prevent clicks */
}

#tabs #split-view-btn {
  margin-left: auto;
  border-left: 1px solid var(--border-color);
}

#content-area {
  flex-grow: 1;
  position: relative;
}

.content-view {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  flex-direction: column;
  overflow: auto;
}

.content-view.active {
  display: flex;
}

/* --- Split View Styles --- */
/* When split-view-active is applied to content-area, make it a row flex container */
#content-area.split-view-active {
  display: flex;
  flex-direction: row;
}

#content-area.split-view-active .content-view {
  /* This is the key fix: override absolute positioning to allow flexbox to work */
  position: relative; 
  width: 50%;
}

#content-area.split-view-active #code-view {
  border-right: 1px solid var(--border-color);
}

/* --- Resizer Styles --- */
.resizer {
  background-color: var(--border-color);
  cursor: col-resize;
  flex-shrink: 0;
  z-index: 10;
}

.resizer:hover {
  background-color: var(--accent-color);
}

#sidebar-resizer {
  width: 5px;
}

#split-view-resizer {
  width: 5px;
  display: none; /* Hidden by default, shown in split view */
}

/* Code View */
#code-view {
  gap: 0.5rem;
}

#toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.5rem;
  background-color: var(--secondary-bg);
  border-bottom: 1px solid var(--border-color);
}

#toolbar button,
#toolbar label {
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--accent-color);
  color: white;
  cursor: pointer;
  transition: background-color 0.2s;
  display: inline-block;
  height: 38px;
  padding: 0 30px;
  font-size: 11px;
  font-weight: 600;
  line-height: 38px;
  letter-spacing: 0.1rem;
  text-transform: uppercase;
  margin: 8px 0;
}

#toolbar button:hover,
#toolbar label:hover {
  background-color: var(--accent-hover);
}

#toolbar #delete-btn {
  background-color: var(--danger-color);
}
#toolbar #delete-btn:hover {
  background-color: var(--danger-hover);
}

#toolbar button:disabled,
#toolbar button:disabled:hover {
  background-color: #bdc3c7; /* A neutral gray color */
  cursor: not-allowed;
  color: #ecf0f1;
}

button#fullscreen-btn {
    padding: 0 10px;
    font-size: 2rem;
}

#code-editor {
  flex-grow: 1;
  border: none;
  padding: 1rem;
  font-family: "Courier New", Courier, monospace;
  font-size: 1.5rem;
  resize: none;
  outline: none;
  background-color: var(--secondary-bg);
  color: inherit; /* Or explicitly var(--text-color) */
}

/* Diagram Toolbar (for split view) */
#diagram-toolbar {
  display: none; /* Hidden by default */
  padding: 0.5rem;
  background-color: var(--secondary-bg);
  border-bottom: 1px solid var(--border-color);
  text-align: right;
}

#diagram-toolbar #render-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--accent-color);
  color: white;
  cursor: pointer;
  font-size: 0.9rem;
}

main.split-view-active #diagram-toolbar {
  display: none; /* Hide in split view as rendering is now automatic */
}

/* Diagram View */
#diagram-container {
  padding: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

/* --- Project Sidebar --- */
#project-sidebar {
  width: 250px;
  background-color: var(--primary-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: width 0.3s ease;
  flex-shrink: 0;
  overflow: hidden;
}

#project-sidebar.closed {
  width: 0;
}

#sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

#sidebar-header h3 {
  margin: 0;
  font-size: 2rem;
}

#project-selector-container {
  display: flex;
  padding: 0.5rem;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

#project-selector {
  flex-grow: 1;
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
    margin: 8px 0;

}

#new-project-btn {
  background-color: var(--accent-color);
  flex-shrink: 0;
  width: 36px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  padding: 0;
  line-height: 0;
  margin: 8px 0;
}

#delete-project-btn {
  flex-shrink: 0;
  width: 36px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--danger-color);
  color: white;
  font-size: 1rem;
  cursor: pointer;
  padding: 0;
  line-height: 0;
  margin: 8px 0;
}

#diagram-list {
  list-style-type: none;
  padding: 0;
  margin: 0;
  flex-grow: 1;
  overflow-y: auto;
}

#diagram-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  position: relative; /* For positioning the edit button */
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s;
}

.diagram-thumbnail {
  width: 80px;
  height: 50px;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--secondary-bg);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.diagram-thumbnail svg {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.diagram-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.edit-diagram-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    border:0;
    width: 36px;
    padding: 0;
    line-height: 0;
}

#diagram-list li:hover .edit-diagram-btn {
  opacity: 1; /* Show on hover */
}

#diagram-list li:hover {
  background-color: var(--hover-bg);
}

#diagram-list li.active {
  background-color: var(--accent-color);
  color: white;
  font-weight: bold;
}

#diagram-list li.no-diagrams {
  color: #7f8c8d;
  cursor: default;
  display: block; /* Revert flex for this specific item */
}

.thumbnail-error {
  border-color: var(--danger-color);
  color: var(--danger-color);
  font-size: 0.7rem;
  text-align: center;
}

.thumbnail-loader {
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--accent-color);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}


#sidebar-footer {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-top: 1px solid var(--border-color);
}

.sidebar-btn {
  display: block;
  width: 100%;
  background-color: var(--secondary-bg);
  color: var(--text-color);
  text-align: center;
  box-sizing: border-box;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
  height: 38px;
  padding: 0 30px;
  font-size: 11px;
  font-weight: 600;
  line-height: 38px;
  letter-spacing: 0.1rem;
  text-transform: uppercase;
}

.sidebar-btn:hover {
  background-color: var(--hover-bg);
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
}

.modal-content {
  background-color: var(--secondary-bg);
  padding: 20px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: 80%;
  max-width: 500px;
}

.modal-content h2,
.modal-content h3 {
  margin-top: 0;
  color: var(--text-color);
}

.modal-content h3 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.25rem;
}

input,
select,
textarea {
  width: 100%;
  padding: 8px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-sizing: border-box;
  background-color: var(--secondary-bg);
  color: var(--text-color);
}

.modal-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.modal-buttons button:disabled {
  background-color: #bdc3c7;
  cursor: not-allowed;
  color: #ecf0f1;
}

#open-modal-list-models,
#open-modal-list-processes {
  list-style-type: none;
  padding: 0;
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
}
#open-modal-list-models li,
#open-modal-list-processes li {
  padding: 10px;
  cursor: pointer;
}
#open-modal-list-models li:hover,
#open-modal-list-processes li:hover {
  background-color: var(--primary-bg);
}
#open-modal-list-models li.selected,
#open-modal-list-processes li.selected {
  background-color: var(--accent-color);
  color: white;
}

#file-info {
  padding: 0.5rem;
  background-color: var(--hover-bg);
  font-size: 0.9rem;
  text-align: center;
}

/* --- Autosave toggle (reuses the .theme-switch slider geometry) --- */
.autosave-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.autosave-label {
  color: var(--header-text);
  font-weight: normal;
}

/* --- Toggle slider --- */

.theme-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--accent-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

/* --- Reconnect banner (FSA permission lapsed) --- */
.reconnect-banner {
  display: none; /* shown via .visible class */
  background-color: #fff3cd;
  color: #856404;
  border-bottom: 1px solid #ffeeba;
  padding: 0.6rem 1rem;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.reconnect-banner.visible {
  display: flex;
}

.reconnect-banner button {
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: 4px;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05rem;
}

.reconnect-banner button:hover {
  background-color: var(--accent-hover);
}

.persistent-note {
  display: none;
  font-size: 0.85rem;
  color: #856404;
  margin-left: 0.25rem;
}

.persistent-note.visible {
  display: inline;
}

body.dark-mode .reconnect-banner {
  background-color: #5a4a1f;
  color: #f1c40f;
  border-bottom-color: #756339;
}

body.dark-mode .persistent-note {
  color: #f1c40f;
}

/* --- Mode picker (in New Project modal) --- */
.mode-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.mode-option {
  display: flex;
  align-items: flex-start;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  gap: 0.6rem;
  transition: background-color 0.15s;
}

.mode-option:hover {
  background-color: var(--hover-bg);
}

.mode-option input[type="radio"] {
  width: auto;
  margin: 0.2rem 0 0 0;
  flex-shrink: 0;
}

.mode-option-label {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.mode-option-label small {
  color: #7f8c8d;
  font-size: 0.85rem;
  margin-top: 0.2rem;
}

.mode-option.disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.mode-option.disabled:hover {
  background-color: transparent;
}

.mode-option.disabled .mode-option-detail {
  color: var(--danger-color);
}

/* --- Fullscreen Mode --- */
body.fullscreen-active header,
body.fullscreen-active footer {
  display: none;
}

body.fullscreen-active main {
  height: 100vh;
}