/* Windows 11 Fluent Design Styling */

:root {
  /* HSL tailored color palette - Light Mode */
  --bg-app: hsla(210, 20%, 96%, 0.6); /* Light Mica Material */
  --bg-editor: hsla(0, 0%, 100%, 0.7);
  --bg-menu-hover: hsla(210, 10%, 10%, 0.05);
  --bg-menu-active: hsla(210, 10%, 10%, 0.08);
  --text-primary: hsl(210, 15%, 15%);
  --text-secondary: hsl(210, 10%, 45%);
  --border-color: hsla(210, 10%, 10%, 0.08);
  --accent-color: hsl(210, 100%, 45%);
  --accent-glow: hsla(210, 100%, 45%, 0.15);
  
  --titlebar-drag: drag;
  --transition-speed: 0.2s;
  --font-ui: 'Outfit', 'Segoe UI Variable Display', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
  --border-radius-ui: 6px;
  --border-radius-editor: 8px;
}

body.dark-theme, [data-theme="dark"] {
  /* HSL tailored color palette - Dark Mode */
  --bg-app: hsla(210, 14%, 11%, 0.7); /* Dark Mica Material */
  --bg-editor: hsla(210, 12%, 15%, 0.75);
  --bg-menu-hover: hsla(0, 0%, 100%, 0.06);
  --bg-menu-active: hsla(0, 0%, 100%, 0.1);
  --text-primary: hsl(210, 15%, 95%);
  --text-secondary: hsl(210, 10%, 65%);
  --border-color: hsla(0, 0%, 100%, 0.07);
  --accent-color: hsl(200, 100%, 65%);
  --accent-glow: hsla(200, 100%, 65%, 0.2);
}

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

html,
body {
  background: #1e1e1e !important;
}

body {
  font-family: var(--font-ui);
  background-color: #1e1e1e;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* Windows 11 Title Bar */
#title-bar {
  height: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-app);
  position: relative;
  z-index: 9999;
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
  user-select: none;
  flex-shrink: 0;
}

.title-bar-drag-area {
  display: flex;
  align-items: center;
  padding-left: 16px;
  height: 100%;
  flex-grow: 1;
  -webkit-app-region: drag;
  font-size: 12px;
  font-weight: 500;
}

.app-icon {
  margin-right: 10px;
  font-size: 14px;
}

.app-title {
  opacity: 0.85;
}

/* Window Controls */
.window-controls {
  display: flex;
  height: 100%;
  -webkit-app-region: no-drag;
}

.win-btn {
  background: transparent;
  border: none;
  width: 46px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  cursor: pointer;
  transition: background-color 0.1s ease, color 0.1s ease;
}

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

.win-btn:active {
  background-color: var(--bg-menu-active);
}

#win-close:hover {
  background-color: #e81123 !important;
  color: #ffffff !important;
}

#win-close:active {
  background-color: #f1707a !important;
  color: #ffffff !important;
}


/* Menu Navigation Bar */
#menu-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 16px;
  background-color: var(--bg-app);
  border-bottom: 1px solid var(--border-color);
  transition: border-color var(--transition-speed) ease, background-color var(--transition-speed) ease;
  flex-shrink: 0;
}

.menu-left {
  display: flex;
  gap: 6px;
}

.menu-right {
  display: flex;
  gap: 6px;
  align-items: center;
}

#menu-bar button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-primary);
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-ui);
  border-radius: var(--border-radius-ui);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

#menu-bar button .icon {
  font-size: 14px;
}

#menu-bar button:hover {
  background-color: var(--bg-menu-hover);
  border-color: var(--border-color);
}

#menu-bar button:active {
  background-color: var(--bg-menu-active);
  transform: scale(0.97);
}

#menu-bar button.active {
  background-color: var(--accent-glow) !important;
  border-color: var(--accent-color) !important;
  color: var(--accent-color) !important;
}

.icon-btn {
  width: 32px;
  height: 32px;
  padding: 0 !important;
  justify-content: center;
  font-size: 15px !important;
  border-radius: 50% !important;
}

/* Editor Section */
main {
  flex-grow: 1;
  min-height: 0;
  padding: 0 16px 16px 16px;
  background-color: var(--bg-app);
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-speed) ease;
}

.editor-container {
  flex-grow: 1;
  position: relative;
  width: 100%;
  height: 100%;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-editor);
  background-color: var(--bg-editor);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
  overflow: hidden;
  display: flex;
}

body.dark-theme .editor-container {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.editor-container.focused {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Virtual Gutter for Line Numbers */
.editor-gutter {
  width: 55px;
  background-color: var(--bg-app);
  border-right: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  user-select: none;
  position: relative;
  overflow: hidden;
  height: 100%;
  box-sizing: border-box;
}

.editor-gutter-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.gutter-line {
  position: absolute;
  width: 100%;
  text-align: right;
  padding-right: 12px;
  box-sizing: border-box;
  opacity: 0.5;
  transition: opacity 0.1s ease, color 0.1s ease;
}

.gutter-line.current {
  color: var(--accent-color);
  opacity: 1;
  font-weight: 600;
}

/* Main Scrollable Area */
.editor-scrollable {
  flex-grow: 1;
  height: 100%;
  overflow: auto;
  position: relative;
  outline: none;
  box-sizing: border-box;
}

.editor-main-canvas,
.editor-webgl-canvas,
.editor-selection-canvas,
.editor-cursor-canvas,
.editor-minimap-canvas,
.editor-overlay-canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

.editor-selection-canvas {
  z-index: 1;
}

.editor-main-canvas,
.editor-webgl-canvas {
  z-index: 2;
}

.editor-cursor-canvas {
  z-index: 3;
}

.editor-minimap-canvas {
  z-index: 4;
}

.editor-overlay-canvas {
  z-index: 5;
}

/* Virtualized Lines Layer */
.editor-lines-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.editor-line {
  position: absolute;
  left: 12px;
  right: 12px;
  box-sizing: border-box;
  white-space: pre;
  height: 1.6em; /* 1.6 times font-size */
  contain: layout style paint;
}

.editor-line.word-wrap-disabled {
  white-space: pre;
}

/* Custom Selection Highlight Layer */
.editor-selection-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.editor-selection-rect {
  position: absolute;
  background-color: var(--accent-glow);
  border-radius: 2px;
}

.editor-search-highlight {
  position: absolute;
  background-color: hsla(45, 100%, 50%, 0.25);
  border: 1px solid hsla(45, 100%, 50%, 0.5);
  border-radius: 2px;
}

/* Custom caret styling */
.editor-cursor {
  position: absolute;
  width: 2px;
  height: 18px;
  background-color: var(--text-primary);
  pointer-events: none;
  animation: cursor-blink 1s steps(2, start) infinite;
  display: none;
}

.editor-container.focused .editor-cursor {
  display: block;
}

@keyframes cursor-blink {
  to {
    visibility: hidden;
  }
}

/* Invisible input for focus & input hooks */
.editor-hidden-input {
  position: absolute;
  opacity: 0.01;
  left: 0;
  top: 0;
  width: 1px;
  height: 1px;
  z-index: 1;
  pointer-events: auto;
  border: none;
  outline: none;
  padding: 0;
  margin: 0;
}

/* Scrollbars */
.editor-scrollable::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.editor-scrollable::-webkit-scrollbar-track {
  background: transparent;
}

.editor-scrollable::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.editor-scrollable::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Status Bar */
#status-bar {
  display: flex;
  justify-content: space-between;
  padding: 6px 20px;
  background-color: var(--bg-app);
  border-top: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
  transition: border-color var(--transition-speed) ease, background-color var(--transition-speed) ease;
  flex-shrink: 0;
}

.status-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.divider {
  opacity: 0.3;
}

/* Find & Replace Panel Styling */
.find-replace-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background-color: var(--bg-app);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 20px;
  transition: all var(--transition-speed) ease;
  flex-shrink: 0;
}

.find-replace-panel.hidden {
  display: none;
}

.panel-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.find-replace-panel input {
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-ui);
  color: var(--text-primary);
  padding: 6px 12px;
  font-size: 13px;
  outline: none;
  width: 240px;
  transition: border-color 0.15s ease;
}

.find-replace-panel input:focus {
  border-color: var(--accent-color);
}

.action-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-ui);
  cursor: pointer;
  font-size: 11px;
  transition: background-color 0.15s ease;
}

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

.toggle-btn[data-active="true"] {
  background-color: var(--accent-color, #0078d4);
  color: white;
}

.text-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-ui);
  color: var(--text-primary);
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.text-btn:hover {
  background-color: var(--bg-menu-hover);
  border-color: var(--border-color);
}

.text-btn:active {
  background-color: var(--bg-menu-active);
}

.hidden {
  display: none !important;
  pointer-events: none !important;
}

/* Tab Bar Styling (Phase 2 Multi-tab) */
#tab-bar {
  display: flex;
  align-items: center;
  background-color: var(--bg-app);
  padding: 4px 8px 0 8px;
  border-bottom: 1px solid var(--border-color);
  gap: 4px;
  user-select: none;
  flex-shrink: 0;
}

#tab-bar-inner {
  display: flex;
  flex: 1;
  min-width: 0;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  scrollbar-width: thin;
}
#tab-bar-inner::-webkit-scrollbar { height: 4px; }
#tab-bar-inner::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 2px; }

.tab-scroll-btn {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  padding: 0;
  font-size: 16px;
  line-height: 1;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--border-radius-ui);
  cursor: pointer;
}
.tab-scroll-btn:hover {
  background: var(--bg-editor);
  color: var(--text-primary);
}

.tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background-color: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  max-width: 150px;
  min-width: 80px;
  position: relative;
  transition: all 0.15s ease;
}

.tab:hover {
  background-color: var(--bg-menu-hover);
  color: var(--text-primary);
}

.tab.active {
  background-color: var(--bg-editor);
  color: var(--text-primary);
  border-color: var(--border-color);
  font-weight: 500;
  box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.02);
}

.tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--bg-editor);
}

.tab-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex-grow: 1;
}

.tab-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  font-size: 9px;
  color: var(--text-secondary);
  transition: background-color 0.1s, color 0.1s;
}

.tab-close:hover {
  background-color: var(--bg-menu-active);
  color: var(--text-primary);
}

.tab-unsaved-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-color);
  flex-shrink: 0;
}

#btn-new-tab {
  background: transparent;
  border: none;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  margin-left: 4px;
  align-self: center;
  transition: background-color 0.15s, color 0.15s;
}

#btn-new-tab:hover {
  background-color: var(--bg-menu-hover);
  color: var(--text-primary);
}

/* Fluent Modal Styling (Phase 2 Close Confirm) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay:not(.hidden) {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: 360px;
  padding: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transform: scale(0.9);
  transition: transform 0.2s ease;
}

.modal-overlay:not(.hidden) .modal-card {
  transform: scale(1);
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.modal-body {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.fluent-btn {
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: var(--border-radius-ui);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.fluent-btn:active {
  transform: scale(0.98);
}

.fluent-btn.primary {
  background-color: var(--accent-color);
  color: #ffffff;
  border: none;
}

.fluent-btn.primary:hover {
  filter: brightness(1.1);
}

.fluent-btn.primary:active {
  filter: brightness(0.9);
}

/* Fluent loading spinner styling */
.loading-spinner {
  display: inline-flex;
  align-items: center;
  color: var(--accent-color);
  font-weight: 500;
}

.loading-spinner::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid var(--accent-color);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin-loading 0.8s linear infinite;
  margin-right: 6px;
}

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

/* Syntax Highlighting Styles */
.syntax-keyword {
  color: #0066cc;
  font-weight: 600;
}
.syntax-string {
  color: #036a0e;
}
.syntax-comment {
  color: #008000;
  font-style: italic;
}
.syntax-number {
  color: #098658;
}

[data-theme="dark"] .syntax-keyword {
  color: #569cd6;
  font-weight: 600;
}
[data-theme="dark"] .syntax-string {
  color: #ce9178;
}
[data-theme="dark"] .syntax-comment {
  color: #6a9955;
  font-style: italic;
}
[data-theme="dark"] .syntax-number {
  color: #b5cea8;
}

/* Drag and Drop Reordering */
.tab.dragging {
  opacity: 0.4;
  border: 1px dashed var(--accent-color) !important;
}

.tab.drag-over-left::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--accent-color);
  z-index: 10;
}

.tab.drag-over-right::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--accent-color);
  z-index: 10;
}

/* Pinned Tabs */
.tab.pinned {
  min-width: 36px;
  max-width: 48px;
  padding: 6px 8px;
  justify-content: center;
}

.tab.pinned .tab-title {
  display: none; /* Hide title for pinned tabs to save space */
}

.tab-pin-icon {
  font-size: 10px;
  opacity: 0.6;
  transition: opacity 0.15s;
}

.tab-pin-icon:hover {
  opacity: 1;
}

/* Closing Tab Animation */
.tab.closing {
  max-width: 0 !important;
  min-width: 0 !important;
  width: 0 !important;
  padding-left: 0 !important;
  padding-right: 0 !important;
  margin: 0 !important;
  opacity: 0;
  overflow: hidden;
  border: none !important;
}

/* Diagnostics HUD (Phase 3 Rendering & Performance) */
.diagnostics-hud {
  position: fixed;
  top: 50px;
  right: 20px;
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  z-index: 999;
  font-family: var(--font-mono);
  font-size: 11px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(8px);
  pointer-events: auto; /* Allow button click */
  transition: opacity 0.2s ease, transform 0.2s ease;
  color: var(--text-primary);
  width: 280px;
  max-height: 85vh;
  overflow-y: auto;
}

.diagnostics-hud.hidden {
  opacity: 0;
  transform: translateY(-10px);
  display: none !important;
}

.hud-title {
  font-weight: 700;
  font-size: 12px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 4px;
}

.hud-item {
  margin: 4px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

/* Noise Texture Overlay (Mica visual physical finish) */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  opacity: 0.015;
  pointer-events: none;
  z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Fluent Reveal spotlight hover effect */
.reveal-btn {
  position: relative;
  overflow: hidden;
}

.reveal-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    circle 45px at var(--mouse-x, -99px) var(--mouse-y, -99px),
    var(--accent-glow),
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
  z-index: 0;
}

.reveal-btn:hover::before {
  opacity: 1;
}

.reveal-btn > * {
  position: relative;
  z-index: 1;
}

/* Spring modal animations */
.modal-card {
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: 360px;
  padding: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transform: scale(0.85) translateY(20px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
  opacity: 0;
}

.modal-overlay:not(.hidden) .modal-card {
  transform: scale(1) translateY(0);
  opacity: 1;
}

/* High Contrast Theme support */
body.contrast-theme, [data-theme="contrast"] {
  --bg-app: #000000 !important;
  --bg-editor: #000000 !important;
  --bg-menu-hover: #1a1a1a !important;
  --bg-menu-active: #333333 !important;
  --text-primary: #ffff00 !important; /* Bright Yellow */
  --text-secondary: #ffffff !important;
  --border-color: #ffffff !important;
  --accent-color: #00ffff !important; /* Cyan */
  --accent-glow: rgba(0, 255, 255, 0.3) !important;
  backdrop-filter: none !important;
}

body.contrast-theme * {
  border-color: #ffffff !important;
}

body.contrast-theme button {
  border: 1px solid #ffffff !important;
  background-color: #000000 !important;
  color: #ffff00 !important;
}

body.contrast-theme button:hover {
  background-color: #1a1a1a !important;
}

/* AI Assistant Sidebar Panel */
.ai-panel {
  width: 320px;
  min-width: 320px;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-editor);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(25px);
  overflow: hidden;
  transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease;
}

body.dark-theme .ai-panel {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.ai-panel.hidden {
  display: none !important;
}

.ai-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background-color: var(--bg-app);
  border-bottom: 1px solid var(--border-color);
}

.ai-panel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.ai-panel-controls {
  display: flex;
  gap: 4px;
}

.ai-chat-history {
  flex-grow: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ai-message {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.5;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.ai-message.user {
  background-color: var(--accent-glow);
  color: var(--text-primary);
  align-self: flex-end;
  border-bottom-right-radius: 2px;
  border: 1px solid var(--border-color);
}

.ai-message.assistant {
  background-color: var(--bg-app);
  color: var(--text-primary);
  align-self: flex-start;
  border-bottom-left-radius: 2px;
  border: 1px solid var(--border-color);
}

.ai-message.system-error {
  background-color: rgba(232, 17, 35, 0.1);
  color: #e81123;
  border: 1px solid rgba(232, 17, 35, 0.2);
  align-self: center;
  max-width: 95%;
  font-family: var(--font-mono);
  font-size: 12px;
}

.ai-input-area {
  padding: 12px 16px;
  background-color: var(--bg-app);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#ai-prompt-input {
  width: 100%;
  height: 60px;
  background-color: var(--bg-editor);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-ui);
  padding: 8px;
  font-family: var(--font-ui);
  font-size: 13px;
  outline: none;
  resize: none;
  transition: border-color var(--transition-speed) ease;
}

#ai-prompt-input:focus {
  border-color: var(--accent-color);
}

.ai-input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#ai-token-count {
  font-size: 11px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.ai-input-buttons {
  display: flex;
  gap: 8px;
}

/* AI Settings Form Inputs */
#ai-settings-modal input[type="text"],
#ai-settings-modal input[type="password"] {
  padding: 8px;
  border-radius: var(--border-radius-ui);
  background: var(--bg-editor);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-family: var(--font-ui);
  font-size: 13px;
  outline: none;
}

#ai-settings-modal input[type="text"]:focus,
#ai-settings-modal input[type="password"]:focus {
  border-color: var(--accent-color);
}

#ai-settings-modal label {
  font-size: 13px;
  color: var(--text-primary);
}

/* Fluent Context Menu */
.fluent-context-menu {
  position: absolute;
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px;
  min-width: 220px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(20px);
}

.fluent-context-menu .menu-item {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-primary);
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  transition: background-color 0.1s ease;
}

.fluent-context-menu .menu-item:hover {
  background-color: var(--bg-menu-hover);
}

.fluent-context-menu .menu-item .icon {
  font-size: 14px;
  width: 18px;
  display: inline-block;
  text-align: center;
}

.fluent-context-menu .menu-item .arrow {
  margin-left: auto;
  font-size: 10px;
  opacity: 0.7;
}

.fluent-context-menu .divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 6px 4px;
}

/* Submenu layout */
.fluent-context-menu .menu-item-parent {
  position: relative;
}

.fluent-context-menu .menu-item-parent:hover .menu-submenu {
  display: flex;
}

.fluent-context-menu .menu-submenu {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px;
  min-width: 140px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  flex-direction: column;
  z-index: 10001;
  backdrop-filter: blur(20px);
}

/* Inline Rewrite Popover */
.ai-inline-popover {
  position: absolute;
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 9999;
  min-width: 320px;
  backdrop-filter: blur(20px);
}

.ai-inline-popover input {
  flex-grow: 1;
  border: 1px solid var(--border-color);
  background-color: var(--bg-app);
  color: var(--text-primary);
  border-radius: var(--border-radius-ui);
  padding: 6px 10px;
  font-size: 13px;
  outline: none;
}

.ai-inline-popover input:focus {
  border-color: var(--accent-color);
}

.ai-inline-popover .fluent-btn {
  padding: 6px 12px;
  min-width: unset;
}

/* AI Command Palette */
.palette-card {
  background-color: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 480px;
  max-width: 90vw;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: blur(20px);
  transform: scale(0.85) translateY(20px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
  opacity: 0;
}

.modal-overlay:not(.hidden) .palette-card {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.palette-header {
  border-bottom: 1px solid var(--border-color);
  padding: 12px;
}

#palette-search {
  width: 100%;
  border: 1px solid var(--border-color);
  background-color: var(--bg-app);
  color: var(--text-primary);
  border-radius: 6px;
  padding: 10px 14px;
  font-family: var(--font-ui);
  font-size: 14px;
  outline: none;
}

#palette-search:focus {
  border-color: var(--accent-color);
}

.palette-list {
  max-height: 320px;
  overflow-y: auto;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.palette-item {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-primary);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color 0.1s ease;
}

.palette-item.active,
.palette-item:hover {
  background-color: var(--bg-menu-hover);
}

.palette-item .palette-item-main {
  display: flex;
  align-items: center;
  gap: 10px;
}

.palette-item .palette-item-shortcut {
  font-size: 11px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  opacity: 0.8;
}

/* File Tree Sidebar Styles */
.tree-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  font-size: 13px;
  transition: background-color 0.15s, color 0.15s;
}

.tree-item:hover {
  background-color: var(--bg-menu-hover);
}

.tree-item.directory {
  font-weight: 600;
  color: var(--text-primary);
}

.tree-item.file {
  color: var(--text-secondary);
}

.tree-item.active {
  background-color: var(--bg-menu-active) !important;
  color: var(--accent-color) !important;
  font-weight: 600;
}

.tree-item-indent {
  display: inline-block;
  width: 14px;
  flex-shrink: 0;
}

/* Global search result styles */
.search-res-item {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.15s;
}
.search-res-item:hover {
  background-color: var(--bg-menu-hover);
}
.search-res-file {
  font-weight: 600;
  font-size: 12px;
  margin-bottom: 4px;
}
.search-res-line {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.8;
}

/* Zen Mode Styles */
body.zen-active #title-bar,
body.zen-active #tab-bar,
body.zen-active #menu-bar,
body.zen-active #status-bar,
body.zen-active #workspace-sidebar {
  display: none !important;
}

body.zen-active main {
  padding: 0 !important;
  height: 100vh !important;
}

body.zen-active .editor-container {
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  height: 100% !important;
}

/* Distraction-Free Margins Centering */
.editor-container.distraction-free {
  max-width: 800px !important;
  margin: 0 auto !important;
  border-radius: 8px !important;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15) !important;
}





/* Workspace Tree (N++ Explorer style) */
.workspace-toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  background: var(--bg-app);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.workspace-toolbar .action-btn {
  font-size: 13px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.workspace-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  padding: 6px 10px;
  font-size: 11px;
  background: var(--bg-app);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  font-family: var(--font-mono);
  min-height: 28px;
  user-select: none;
}
.ws-crumb {
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 3px;
  white-space: nowrap;
}
.ws-crumb:hover { background: var(--bg-editor); }
.ws-crumb-sep { opacity: 0.4; }
.workspace-filter-row {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-app);
  flex-shrink: 0;
}
.workspace-filter-input {
  width: 100%;
  padding: 5px 10px;
  border-radius: var(--border-radius-ui);
  border: 1px solid var(--border-color);
  background: var(--bg-editor);
  color: var(--text-primary);
  font-size: 12px;
  outline: none;
  font-family: var(--font-ui);
  box-sizing: border-box;
}
.workspace-filter-input:focus { border-color: var(--accent-color, #4a8df5); }
.workspace-tree {
  flex-grow: 1;
  overflow-y: auto;
  overflow-x: auto;
  padding: 6px 0;
  font-size: 13px;
  user-select: none;
  background: var(--bg-app);
}
.ws-empty-hint {
  opacity: 0.5;
  font-style: italic;
  text-align: center;
  margin-top: 30px;
  font-size: 12px;
}
.ws-node {
  display: flex;
  align-items: center;
  padding: 3px 8px 3px 0;
  cursor: pointer;
  white-space: nowrap;
  font-size: 13px;
  line-height: 1.4;
  position: relative;
}
.ws-node:hover { background: var(--bg-editor); }
.ws-node.ws-selected { background: var(--accent-color, #4a8df5); color: white; }
.ws-node.ws-hidden { display: none; }
.ws-node-chevron {
  display: inline-block;
  width: 16px;
  height: 16px;
  text-align: center;
  font-size: 9px;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: transform 0.1s;
}
.ws-node.ws-expanded > .ws-node-chevron { transform: rotate(90deg); }
.ws-node-icon {
  display: inline-block;
  width: 18px;
  text-align: center;
  flex-shrink: 0;
  font-size: 13px;
}
.ws-node-name {
  flex-grow: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ws-node-loading, .ws-node-empty {
  font-size: 10px;
  opacity: 0.5;
  margin-left: 6px;
  font-style: italic;
}
.ws-node-error {
  font-size: 10px;
  color: #e74c3c;
  margin-left: 6px;
  font-style: italic;
}
.ws-children { display: none; }
.ws-node.ws-expanded + .ws-children { display: block; }

/* Context menu */
.ws-context-menu {
  position: fixed;
  z-index: 10000;
  min-width: 180px;
  background: var(--bg-editor);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-ui);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  padding: 4px 0;
  font-size: 12px;
  user-select: none;
}
.ws-ctx-item {
  padding: 6px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}
.ws-ctx-item:hover { background: var(--accent-color, #4a8df5); color: white; }
.ws-ctx-sep { height: 1px; background: var(--border-color); margin: 4px 0; }
.ws-ctx-danger { color: #e74c3c; }
.ws-ctx-danger:hover { background: #e74c3c; color: white; }