/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Dark theme (default) */
:root,
body.theme-dark {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-terminal: #0f0f23;
  --text-primary: #eaeaea;
  --text-secondary: #a0a0a0;
  --accent: #00d4aa;
  --accent-hover: #00b894;
  --error: #ff6b6b;
  --success: #51cf66;
  --border: #2d2d44;
  --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
  --font-sans:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

/* Light theme */
body.theme-light {
  --bg-primary: #f5f5f5;
  --bg-secondary: #ffffff;
  --bg-terminal: #fafafa;
  --text-primary: #1a1a1a;
  --text-secondary: #606060;
  --accent: #00a88a;
  --accent-hover: #008f74;
  --error: #d63031;
  --success: #00b894;
  --border: #d0d0d0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
}

.container {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  text-align: center;
  padding: 20px;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}

header h1 {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 10px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Main layout - FIXED GRID with ACCORDION behavior */
main {
  flex: 1;
  display: flex;
  flex-direction: column; /* Stack panels vertically for accordion */
  gap: 8px; /* Reduced from 20px to fit panels (9 panels × 8px gaps) */
  padding: 20px;
  min-height: 0;
  height: calc(100vh - 60px); /* Fixed height - no scrolling */
  overflow: hidden; /* Prevent scrolling - fixed grid */
}

/* WOS-307: Responsive Design - Desktop (≥1280px) */
@media (min-width: 1280px) {
  main {
    /* Accordion layout - flexbox column stacking */
    gap: 8px; /* Consistent with base gap for accordion spacing */
  }
}

/* WOS-307: Responsive Design - Laptop (1024-1279px) */
@media (min-width: 1024px) and (max-width: 1279px) {
  main {
    /* Accordion layout - flexbox column stacking */
    gap: 8px; /* Consistent with base gap for accordion spacing */
  }
}

/* WOS-307: Responsive Design - Tablet (768-1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  main {
    /* Accordion layout - flexbox column stacking */
    gap: 8px; /* Consistent with base gap for accordion spacing */
    padding: 16px;
  }
}

/* WOS-307: Responsive Design - Mobile (≤767px) */
@media (max-width: 767px) {
  main {
    /* Accordion layout - flexbox column stacking */
    gap: 8px; /* Consistent with base gap for accordion spacing */
    padding: 12px;
  }
}

/* WOS-307: WCAG 2.1 Level AA - Touch Target Sizes (44×44px minimum) */
@media (max-width: 1023px) {
  /* Increase all button sizes for touch devices */
  .terminal-controls button,
  .btn-icon,
  .btn-collapse,
  .btn-run-tests,
  .btn-show-hint,
  .tutorial-actions button,
  button {
    min-width: 44px;
    min-height: 44px;
    padding: 10px 14px;
  }

  /* Icon buttons need explicit sizing */
  .btn-icon {
    padding: 12px;
  }

  /* Ensure adequate spacing between touch targets */
  .terminal-controls {
    gap: 8px;
  }

  .file-controls {
    gap: 8px;
  }
}

/* Terminal */
.terminal-container {
  background: var(--bg-secondary);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  /* Terminal default height - balanced for panel visibility */
  flex: 0 0 200px; /* Default 200px height - resizable via drag handle */
  max-height: 600px; /* Maximum resize height */
  min-height: 100px; /* Minimum for usability */
  position: relative; /* For absolute positioning of resize handle */
}

/* Resize Handle - Corner drag handle (bottom-right like cloud shells) */
.resize-handle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 20px;
  height: 20px;
  cursor: nwse-resize;
  z-index: 10;
  opacity: 0.5;
  transition: all 0.2s ease;
}

.resize-handle:hover {
  opacity: 1;
  transform: scale(1.1);
}

.resize-handle:active {
  opacity: 1;
  transform: scale(1.15);
}

/* Visual indicator - diagonal dots grip pattern (like VS Code, Chrome DevTools) */
.resize-handle::before {
  content: '';
  position: absolute;
  bottom: 3px;
  right: 3px;
  width: 14px;
  height: 14px;
  background-image:
    radial-gradient(circle, var(--accent) 1.5px, transparent 1.5px),
    radial-gradient(circle, var(--accent) 1.5px, transparent 1.5px),
    radial-gradient(circle, var(--accent) 1.5px, transparent 1.5px),
    radial-gradient(circle, var(--accent) 1.5px, transparent 1.5px),
    radial-gradient(circle, var(--accent) 1.5px, transparent 1.5px),
    radial-gradient(circle, var(--accent) 1.5px, transparent 1.5px);
  background-size: 4px 4px;
  background-position:
    0px 12px,
    4px 12px,
    8px 12px,
    4px 8px,
    8px 8px,
    12px 12px;
  background-repeat: no-repeat;
}

.resize-handle:hover::before {
  background-image:
    radial-gradient(circle, var(--accent) 2px, transparent 2px),
    radial-gradient(circle, var(--accent) 2px, transparent 2px),
    radial-gradient(circle, var(--accent) 2px, transparent 2px),
    radial-gradient(circle, var(--accent) 2px, transparent 2px),
    radial-gradient(circle, var(--accent) 2px, transparent 2px),
    radial-gradient(circle, var(--accent) 2px, transparent 2px);
}

.terminal-header {
  background: var(--bg-terminal);
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.terminal-title {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.terminal-controls {
  display: flex;
  gap: 8px;
}

.terminal-controls button {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.terminal-controls button:hover {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

.terminal {
  background: var(--bg-terminal);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  flex: 1;
  overflow-y: auto;
  scroll-behavior: auto;
  min-height: 0;
}

#terminal-output {
  margin-bottom: 10px;
}

.terminal-line {
  margin-bottom: 4px;
  white-space: pre-wrap;
  word-break: break-word;
}

.terminal-line.command {
  color: var(--accent);
}

.terminal-line.output {
  color: var(--text-primary);
}

.terminal-line.error {
  color: var(--error);
}

.terminal-line.success {
  color: var(--success);
}

.terminal-input-line {
  display: flex;
  align-items: center;
}

.terminal-prompt {
  color: var(--accent);
  margin-right: 8px;
  user-select: none;
}

.terminal-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 0;
}

.terminal-input::selection {
  background: var(--accent);
  color: var(--bg-terminal);
}

/* Panel Toolbar - Icon-based panel switcher */
.panel-toolbar {
  display: flex;
  gap: 4px;
  padding: 8px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0; /* Don't shrink toolbar */
  overflow-x: auto;
  overflow-y: hidden;
}

.toolbar-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 70px;
  flex-shrink: 0;
}

.toolbar-icon:hover {
  background: var(--bg-terminal);
  border-color: var(--border);
  color: var(--text-primary);
}

.toolbar-icon.active {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

.toolbar-icon svg {
  flex-shrink: 0;
}

.toolbar-label {
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
}

/* File Manager - Single panel display */
.file-manager {
  flex: 1; /* Grow to fill remaining vertical space */
  min-height: 0; /* Allow flexbox shrinking */
  overflow: hidden; /* Prevent scrolling */
  position: relative;
}

.file-panel {
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border);
  /* TOOLBAR PATTERN: Hide all panels by default, show only active */
  display: none; /* Hidden by default */
  flex-direction: column;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0;
  margin: 0;
  overflow-y: auto; /* Allow scrolling within panel */
}

.file-panel.active {
  display: flex; /* Show active panel - fills entire file-manager container */
}

.file-panel-header {
  background: var(--bg-terminal);
  padding: 8px 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  /* Fixed height - won't shrink */
  flex-shrink: 0;
}

.file-panel-header h3 {
  color: var(--accent);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0;
}

.file-controls {
  display: flex;
  gap: 8px;
}

.btn-icon {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

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

.btn-icon svg {
  display: block;
}

/* Collapse button icon rotation animation */
.btn-collapse svg {
  transition: transform 0.3s ease;
  transform: rotate(0deg);
}

.collapsed .btn-collapse svg {
  transform: rotate(180deg);
}

/* File Browser */
.file-browser {
  padding: 15px;
  /* No max-height - parent panel-content controls scrolling */
  font-family: var(--font-mono);
  font-size: 13px;
}

.file-placeholder {
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
  padding: 20px;
}

.file-item {
  padding: 10px 12px;
  margin-bottom: 4px;
  background: var(--bg-terminal);
  border-radius: 4px;
  border-left: 3px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.file-item:hover {
  background: var(--bg-primary);
  border-left-color: var(--accent);
}

.file-item.selected {
  border-left-color: var(--accent);
  background: var(--bg-primary);
}

.file-item-name {
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-item-icon {
  color: var(--accent);
  width: 16px;
  height: 16px;
}

.file-item-size {
  color: var(--text-secondary);
  font-size: 11px;
}

/* File Actions */
.file-actions {
  padding: 15px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.action-btn {
  background: var(--bg-terminal);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
}

.action-btn:hover:not(:disabled) {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

.action-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.action-btn svg {
  display: block;
}

/* File Info */
.file-info {
  padding: 15px 20px;
  border-top: 1px solid var(--border);
}

.file-info h4 {
  color: var(--accent);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.file-details {
  font-family: var(--font-mono);
  font-size: 12px;
}

.file-details p {
  margin-bottom: 6px;
}

.file-details strong {
  color: var(--accent);
}

.no-selection {
  color: var(--text-secondary);
  font-style: italic;
}

/* System Info Panel */
.system-panel .system-info {
  padding: 15px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.system-info p {
  margin-bottom: 8px;
}

.system-info strong {
  color: var(--accent);
}

/* Vim Editor Modal */
.vim-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.95);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.vim-modal.hidden {
  display: none;
}

.vim-container {
  width: 100%;
  max-width: 1200px;
  height: 90vh;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.vim-header {
  background: var(--bg-terminal);
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--accent);
}

.vim-file-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.vim-filename {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
}

.vim-modified {
  color: var(--error);
  font-weight: bold;
  font-size: 18px;
}

.vim-modified.hidden {
  display: none;
}

.vim-mode-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.vim-mode {
  color: var(--success);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
}

.vim-position {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
}

.vim-close {
  background: var(--error);
  color: white;
  border: none;
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 20px;
  font-weight: bold;
  line-height: 1;
  transition: all 0.2s;
}

.vim-close:hover {
  background: #ff4444;
}

.vim-editor {
  flex: 1;
  background: var(--bg-terminal);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  padding: 20px;
  overflow: auto;
  color: var(--text-primary);
}

.vim-editor:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.vim-line {
  white-space: pre;
  min-height: 21px;
}

.vim-cursor {
  background: var(--accent);
  color: var(--bg-terminal);
  display: inline-block;
  width: 8px;
}

.vim-statusline {
  background: var(--bg-terminal);
  padding: 8px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  min-height: 32px;
}

.vim-command {
  color: var(--accent);
}

.vim-message {
  color: var(--text-secondary);
}

.vim-message.error {
  color: var(--error);
}

.vim-message.success {
  color: var(--success);
}

/* Footer */
footer {
  text-align: center;
  padding: 15px 20px;
  border-top: 2px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.9rem;
  flex-shrink: 0;
}

footer p {
  margin-bottom: 8px;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Loading state */
.loading {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Scrollbar styling */
.terminal::-webkit-scrollbar {
  width: 10px;
}

.terminal::-webkit-scrollbar-track {
  background: var(--bg-terminal);
}

.terminal::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
}

.terminal::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Cursor blink */
.terminal-input:focus + .cursor,
.cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--accent);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* System Monitor Panel - Zenith Style */
.system-monitor-panel {
  background: var(--bg-secondary);
}

.system-monitor-panel .panel-content {
  padding: 4px;
}

.system-monitor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
  padding: 0;
  /* Deterministic constraint: Grid must not exceed parent panel-content */
  max-height: 100%;
  overflow-y: auto;
}

.monitor-card {
  background: var(--bg-terminal);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px;
  transition: all 0.3s ease;
  /* Deterministic sizing: Reduce size to fit within panel constraints */
  min-height: 0;
}

.monitor-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(0, 212, 170, 0.1);
}

.monitor-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 1px;
  font-weight: 600;
}

.monitor-value {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 1px;
}

.monitor-unit {
  font-size: 14px;
  color: var(--text-secondary);
  margin-left: 4px;
  font-weight: 400;
}

.monitor-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-primary);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 4px;
}

.monitor-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease, background-color 0.3s ease;
}

.monitor-bar-cpu {
  background: linear-gradient(90deg, var(--accent), #00b894);
}

.monitor-bar-memory {
  background: linear-gradient(90deg, #6c5ce7, #a29bfe);
}

.monitor-bar-fill[style*="width: 0"] {
  background: var(--border);
}

.monitor-subtext {
  font-size: 11px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* Responsive monitor grid */
@media (max-width: 768px) {
  .system-monitor-grid {
    grid-template-columns: 1fr;
  }
}

/* Panel Management - Mathematical Layout */
.panel-content {
  padding: 10px;
  /* Flex to fill available space after header */
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  /* Content scrolls within mathematically calculated space */
}

/* REMOVED: Old accordion collapse - toolbar pattern doesn't use this */
/* .file-panel.collapsed {
  flex: 0 0 25px;
  max-height: 25px;
  transition: flex 0.3s ease;
} */

/* Collapsed state handled by lines 1955-1960 with transitions */

/* Process List Panel */
.process-list {
  overflow-x: auto;
}

.process-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
}

.process-table thead {
  background: var(--bg-terminal);
}

.process-table th {
  text-align: left;
  padding: 8px 12px;
  color: var(--accent);
  font-weight: 600;
  border-bottom: 2px solid var(--border);
  cursor: pointer;
  user-select: none;
}

.process-table th:hover {
  background: var(--bg-hover);
}

.process-table th[data-sort]::after {
  content: ' ↕';
  opacity: 0.3;
  font-size: 10px;
}

.process-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
}

.process-table tbody tr {
  cursor: pointer;
  transition: background 0.15s ease;
}

.process-table tbody tr:hover {
  background: var(--bg-terminal);
}

.process-table tbody tr:focus {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.process-table tbody tr.selected,
.process-table tbody tr.highlighted,
.process-table tbody tr.active {
  background: var(--bg-hover);
  border-left: 3px solid var(--accent);
}

/* Process state color coding */
.process-table .process-state {
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
}

.process-table .process-state.state-ready {
  color: #4ecb71;
  background: rgba(78, 203, 113, 0.1);
}

.process-table .process-state.state-running {
  color: #4a9eff;
  background: rgba(74, 158, 255, 0.1);
}

.process-table .process-state.state-blocked {
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.1);
}

.process-table .process-state.state-terminated {
  color: #ff6b6b;
  background: rgba(255, 107, 107, 0.1);
}

.process-table .no-data {
  text-align: center;
  color: var(--text-secondary);
  font-style: italic;
  padding: 20px;
}

/* Memory Panel */
.memory-info {
  font-family: var(--font-mono);
  font-size: 13px;
}

.memory-info p {
  margin-bottom: 8px;
}

.memory-info strong {
  color: var(--accent);
}

/* Memory Visualization with Graphical Bars */
.memory-visualization {
  font-family: var(--font-mono);
  font-size: 13px;
}

.memory-segment {
  margin-bottom: 16px;
}

.segment-label {
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.segment-bar-container {
  width: 100%;
  height: 20px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 4px;
  position: relative;
}

.memory-segment-bar {
  height: 100%;
  transition: width 0.3s ease;
  position: relative;
}

/* Permission color coding */
.memory-segment-bar.perm-read {
  background: linear-gradient(90deg, #4a9eff 0%, #3a8eef 100%);
}

.memory-segment-bar.perm-write {
  background: linear-gradient(90deg, #4ecb71 0%, #3ebb61 100%);
}

.memory-segment-bar.perm-exec {
  background: linear-gradient(90deg, #ff6b6b 0%, #ef5b5b 100%);
}

.memory-segment-bar.perm-rwx {
  background: linear-gradient(90deg, #a855f7 0%, #9845e7 100%);
}

.memory-segment-bar.highlighted {
  box-shadow: 0 0 0 2px var(--accent), 0 0 12px rgba(74, 158, 255, 0.5);
  border-radius: 2px;
}

.memory-segment-bar:hover::after {
  content: attr(title);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-hover);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  font-size: 11px;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.segment-info {
  font-size: 11px;
  color: var(--text-muted);
}

.segment-size {
  font-weight: 600;
  color: var(--text-primary);
}

.memory-summary {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.memory-summary p {
  margin-bottom: 8px;
}

.memory-summary strong {
  color: var(--accent);
}

/* System Call Trace Panel */
.syscall-trace {
  font-family: var(--font-mono);
  font-size: 12px;
  max-height: 200px;
  overflow-y: auto;
}

.syscall-trace .no-data {
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
  padding: 20px;
}

.syscall-entry {
  padding: 4px 8px;
  margin-bottom: 2px;
  background: var(--bg-terminal);
  border-left: 2px solid var(--accent);
  border-radius: 2px;
}

.syscall-entry .syscall-name {
  color: var(--accent);
  font-weight: 600;
}

.syscall-entry .syscall-time {
  color: var(--text-secondary);
  font-size: 11px;
}


/* Monaco Editor Container */
#monaco-editor-container {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* High-contrast theme support */
@media (prefers-contrast: high) {
  #monaco-editor-container {
    /* Monaco will auto-detect high-contrast preference */
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  #monaco-editor-container * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===================================================================
   WOS-303: Learning Objectives & Test Status Panel
   =================================================================== */

.learning-panel .panel-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 12px;
}

/* Learning sections */
.learning-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px;
}

.learning-section .section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.learning-section .section-header h4 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Phase Tracker */
.phase-tracker {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.phase-item {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.phase-item:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
}

.phase-item.active {
  border-color: var(--accent);
  border-width: 2px;
  padding: 9px 11px; /* Adjust for 2px border */
}

.phase-item.completed {
  border-color: var(--success);
}

.phase-item.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.phase-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.phase-status-icon {
  font-size: 16px;
  min-width: 20px;
  text-align: center;
}

.phase-item.completed .phase-status-icon {
  color: var(--success);
}

.phase-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
}

.phase-progress-bar {
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 6px;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.phase-item.completed .progress-fill {
  background: var(--success);
}

.phase-stats {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-secondary);
}

/* Task List */
.task-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.task-item {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  transition: all 0.2s;
}

.task-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  cursor: pointer;
  background: var(--bg-primary);
  transition: background 0.2s;
}

.task-header:hover {
  background: var(--bg-hover);
}

.task-item.expanded .task-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.task-status-icon {
  font-size: 14px;
  min-width: 18px;
  text-align: center;
  color: var(--text-secondary);
}

.task-item.completed .task-status-icon {
  color: var(--success);
}

.task-item.in-progress .task-status-icon {
  color: var(--accent);
}

.task-id {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  padding: 2px 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
}

.task-title {
  font-size: 12px;
  color: var(--text-primary);
  flex: 1;
}

.task-test-count {
  font-size: 11px;
  color: var(--text-secondary);
  padding: 2px 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.task-item.completed .task-test-count {
  color: var(--success);
  font-weight: 600;
}

.task-estimate {
  font-size: 11px;
  color: var(--text-secondary);
  padding: 2px 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
}

.task-details {
  padding: 12px;
  background: var(--bg-primary);
}

.task-tests,
.task-hints {
  margin-bottom: 16px;
}

.task-tests:last-child,
.task-hints:last-child {
  margin-bottom: 0;
}

.task-tests h5,
.task-hints h5 {
  margin: 0 0 8px 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

.test-list {
  margin: 0 0 10px 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.test-item {
  font-size: 11px;
  color: var(--text-secondary);
  padding: 4px 8px;
  background: var(--bg-secondary);
  border-radius: 3px;
}

.btn-run-tests {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--accent);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-run-tests:hover {
  background: var(--accent-hover);
}

.btn-run-tests svg {
  fill: currentColor;
}

/* Progressive Hints */
.hints-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}

.hint-item {
  padding: 8px 10px;
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent);
  border-radius: 3px;
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.5;
}

.hint-item strong {
  color: var(--accent);
  font-weight: 600;
}

.hint-level-1 {
  border-left-color: var(--success);
}

.hint-level-2 {
  border-left-color: var(--accent);
}

.hint-level-3 {
  border-left-color: var(--error);
}

.btn-show-hint {
  padding: 6px 12px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-show-hint:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
}

/* Test Runner */
.test-runner {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.test-runner-controls {
  display: flex;
  gap: 8px;
}

.test-runner-output {
  min-height: 100px;
  max-height: 300px;
  overflow-y: auto;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px;
}

.test-runner-output .loading {
  color: var(--text-secondary);
  font-size: 12px;
  font-style: italic;
}

.test-result {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  margin-bottom: 4px;
  border-radius: 3px;
  font-size: 12px;
}

.test-result.passed {
  background: rgba(46, 160, 67, 0.1);
  border-left: 3px solid var(--success);
}

.test-result.failed {
  background: rgba(214, 48, 49, 0.1);
  border-left: 3px solid var(--error);
}

.test-result-icon {
  font-weight: 600;
  font-size: 14px;
}

.test-result.passed .test-result-icon {
  color: var(--success);
}

.test-result.failed .test-result-icon {
  color: var(--error);
}

.test-name {
  flex: 1;
  color: var(--text-primary);
}

.test-summary {
  padding: 8px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-primary);
  text-align: center;
}

.test-error-display {
  padding: 10px;
  background: rgba(214, 48, 49, 0.05);
  border: 1px solid var(--error);
  border-radius: 4px;
}

.error-header {
  font-size: 12px;
  font-weight: 600;
  color: var(--error);
  margin-bottom: 8px;
}

.error-content {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 11px;
  color: var(--text-primary);
  background: var(--bg-primary);
  padding: 8px;
  border-radius: 3px;
  overflow-x: auto;
}

.error-content pre {
  margin: 0;
  white-space: pre-wrap;
}

/* Celebration Animation */
.celebration {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  cursor: pointer;
  animation: fadeIn 0.3s ease;
}

.celebration.hidden {
  display: none;
}

.celebration-content {
  background: var(--bg-primary);
  border: 2px solid var(--success);
  border-radius: 8px;
  padding: 32px 48px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  animation: bounceIn 0.5s ease;
}

.celebration-title {
  margin: 0 0 12px 0;
  font-size: 24px;
  font-weight: 700;
  color: var(--success);
}

.celebration-message {
  margin: 0;
  font-size: 16px;
  color: var(--text-primary);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
  }
}

/* Reduced motion support for celebrations */
@media (prefers-reduced-motion: reduce) {
  .celebration,
  .celebration-content {
    animation: none !important;
  }

  .celebration {
    opacity: 1;
  }

  .celebration-content {
    transform: scale(1);
  }
}

/* ==========================================================================
   WOS-304: Interactive Tutorial / First-Run Experience
   ========================================================================== */

/* Tutorial Overlay (Full-screen backdrop) */
.tutorial-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease-out;
}

.tutorial-overlay.hidden {
  display: none;
}

/* Tutorial Backdrop (Semi-transparent background) */
.tutorial-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
}

/* Tutorial Container (Dialog box) */
.tutorial-container {
  position: relative;
  max-width: 600px;
  max-height: 80vh;
  margin: 20px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: bounceIn 0.5s ease-out;
}

/* Tutorial Header */
.tutorial-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.tutorial-progress {
  flex: 1;
}

#tutorial-step-indicator {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

#btn-tutorial-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
}

#btn-tutorial-close:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

#btn-tutorial-close:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Tutorial Content */
.tutorial-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.tutorial-step {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tutorial-step.hidden {
  display: none;
}

.tutorial-step h2 {
  margin: 0 0 8px 0;
  font-size: 24px;
  color: var(--text-primary);
}

.tutorial-step p {
  margin: 0 0 12px 0;
  line-height: 1.6;
  color: var(--text-primary);
}

.tutorial-step ul {
  margin: 0 0 12px 0;
  padding-left: 24px;
}

.tutorial-step li {
  margin-bottom: 8px;
  line-height: 1.6;
  color: var(--text-primary);
}

.tutorial-step strong {
  color: var(--accent);
  font-weight: 600;
}

.tutorial-step code {
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  color: var(--text-primary);
}

/* Tutorial Actions (Button container) */
.tutorial-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.tutorial-actions button {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.tutorial-actions button:hover {
  transform: translateY(-1px);
}

.tutorial-actions button:active {
  transform: translateY(0);
}

.tutorial-actions button:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Primary button (Begin, Next, Start Coding) */
.tutorial-actions button[id^="btn-begin"],
.tutorial-actions button[id*="next"],
.tutorial-actions button[id*="start-coding"] {
  background: var(--accent);
  color: white;
}

.tutorial-actions button[id^="btn-begin"]:hover,
.tutorial-actions button[id*="next"]:hover,
.tutorial-actions button[id*="start-coding"]:hover {
  background: var(--accent-hover);
}

/* Secondary button (Skip, Back, Retake) */
.tutorial-actions button[id*="skip"],
.tutorial-actions button[id*="back"],
.tutorial-actions button[id*="retake"] {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.tutorial-actions button[id*="skip"]:hover,
.tutorial-actions button[id*="back"]:hover,
.tutorial-actions button[id*="retake"]:hover {
  background: var(--hover-bg);
}

/* Tutorial Highlight Effect (Glowing border on UI elements) */
.tutorial-highlight {
  position: relative;
  box-shadow: 0 0 0 3px var(--accent),
              0 0 20px rgba(59, 130, 246, 0.5);
  border-radius: 4px;
  animation: tutorialPulse 2s ease-in-out infinite;
  z-index: 9999;
}

@keyframes tutorialPulse {
  0%, 100% {
    box-shadow: 0 0 0 3px var(--accent),
                0 0 20px rgba(59, 130, 246, 0.5);
  }
  50% {
    box-shadow: 0 0 0 3px var(--accent),
                0 0 30px rgba(59, 130, 246, 0.8);
  }
}

/* Help Button (Fixed bottom-right) */
#btn-help {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transition: background 0.2s, transform 0.2s;
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
}

#btn-help:hover {
  background: var(--accent-hover);
  transform: scale(1.1);
}

#btn-help:focus {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

#btn-help.hidden {
  display: none;
}

/* Help Menu (Dropdown) */
#help-menu {
  position: fixed;
  bottom: 90px;
  right: 20px;
  width: 200px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  padding: 8px;
  z-index: 9999;
  animation: fadeIn 0.2s ease-out;
}

#help-menu.hidden {
  display: none;
}

#help-menu button {
  width: 100%;
  padding: 10px 12px;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s;
}

#help-menu button:hover {
  background: var(--hover-bg);
}

#help-menu button:focus {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

/* WOS-306: Progressive Disclosure - Panel Tabs */
.panel-tab {
  position: relative;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  user-select: none;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  margin-bottom: -1px;
}

.panel-tab:hover {
  background: var(--accent);
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 2px 8px rgba(0, 212, 170, 0.3);
}

.panel-tab:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.panel-tab:active {
  transform: translateY(0);
}

/* WOS-306: Panel content transitions */
.file-panel .panel-content {
  transition: opacity 0.3s ease, max-height 0.3s ease, visibility 0s 0s;
  overflow-y: auto;
  opacity: 1;
  visibility: visible;
  max-height: 5000px; /* FIXED: needs explicit value for transition (was: none) */
  display: flex; /* Ensure display is set */
  flex-direction: column;
}

.file-panel.collapsed .panel-content {
  opacity: 0;
  max-height: 0;
  visibility: hidden;
  overflow: hidden; /* Prevent scrollbar flash during collapse */
  transition: opacity 0.3s ease, max-height 0.3s ease, visibility 0s 0.3s;
}

/* Hide tab when panel is expanded */
.file-panel:not(.collapsed) .panel-tab {
  display: none;
}

/* Reduced motion support for tutorial and WOS-306 progressive disclosure */
@media (prefers-reduced-motion: reduce) {
  .tutorial-overlay,
  .tutorial-container,
  #help-menu {
    animation: none !important;
  }

  .tutorial-highlight {
    animation: none !important;
    box-shadow: 0 0 0 3px var(--accent);
  }

  #btn-help:hover {
    transform: none;
  }

  /* WOS-306: Disable panel transitions for reduced motion */
  .panel-tab,
  .file-panel .panel-content {
    transition: none !important;
  }

  .panel-tab:hover {
    transform: none;
  }

  .panel-tab:active {
    transform: none;
  }
}

/* ========================================
   WOS-308: WCAG 2.1 Level AA Accessibility
   ======================================== */

/* Skip Link for Keyboard Navigation (WCAG 2.4.1) */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--bg-primary);
  padding: 8px 16px;
  text-decoration: none;
  font-weight: 600;
  z-index: 10000;
  border-radius: 0 0 4px 0;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* Focus Indicators (WCAG 2.4.7) - Minimum 3:1 contrast */
.terminal-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 212, 170, 0.2);
}

button:focus,
.btn-icon:focus,
.action-btn:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 212, 170, 0.2);
}

a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  text-decoration: underline;
}

input[type="text"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 212, 170, 0.2);
}

/* Ensure focus indicators are never removed globally */
*:focus {
  outline-width: 2px;
  outline-style: solid;
  outline-color: var(--accent);
}

/* High contrast focus for critical elements */
#terminal-input:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(0, 212, 170, 0.25);
}

/* Screen Reader Only Text (for ARIA labels) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Label styling for terminal prompt */
label.terminal-prompt {
  margin-right: 8px;
  user-select: none;
  color: var(--accent);
  font-weight: 600;
}

/* Keyboard Navigation: Ensure visible tab order */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  *:focus {
    outline-width: 3px;
    outline-offset: 3px;
  }

  button:focus,
  .btn-icon:focus {
    outline-width: 4px;
  }
}

/* Reduced transparency for better contrast */
@media (prefers-contrast: more) {
  .file-panel {
    background: var(--bg-secondary);
    opacity: 1;
  }

  button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
  }
}

/* Pragmatic AI Labs Badge - Top Right Corner */
.paiml-badge {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
  z-index: 10000; /* Above tutorial overlay */
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.paiml-badge:hover {
  background: var(--bg-terminal);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 212, 170, 0.2);
}

.paiml-logo {
  width: 24px;
  height: 24px;
  display: block;
}

.paiml-text {
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

/* Responsive: Hide text on small screens */
@media (max-width: 768px) {
  .paiml-badge {
    padding: 8px;
  }

  .paiml-text {
    display: none;
  }
}