/*
 * style.css
 * Modern, minimalist Light Theme with high-contrast aesthetics for whiteboard teaching.
 * Features a streamlined 44px topbar and an elegant floating annotation dock.
 */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eaeef2;
  --bg-hover: #e2e8f0;
  --border-color: #d0d7de;
  --text-main: #24292f;
  --text-light: #0969da;
  --text-dim: #57606a;
  
  --accent-blue: #0969da;
  --accent-green: #1a7f37;
  --accent-yellow: #d97706;
  --accent-orange: #bc4c00;
  --accent-red: #cf222e;
  --accent-purple: #8250df;
  --accent-pointer: #d97706;
  
  --editor-font-size: 18px;
  --ui-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --code-font-family: Consolas, "Cascadia Mono", "Segoe UI Mono", "Liberation Mono", Menlo, Monaco, "Courier New", monospace;
  --toolbar-height: 44px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-variant-ligatures: none !important;
  -webkit-font-variant-ligatures: none !important;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
}

html, body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--ui-font-family);
  user-select: none;
  font-variant-ligatures: none !important;
  -webkit-font-variant-ligatures: none !important;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
}

/* ==========================================================================
   Modern Streamlined Topbar
   ========================================================================== */
#unified-toolbar {
  height: var(--toolbar-height);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  position: relative;
  z-index: 1010; /* Above canvas */
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.tb-left, .tb-center, .tb-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tb-divider {
  width: 1px;
  height: 20px;
  background-color: var(--border-color);
  margin: 0 4px;
}

/* Brand Badge */
.brand-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  font-weight: 700;
  font-size: 14px;
  color: #1f2328;
  margin-right: 4px;
}

.brand-icon {
  color: #f59e0b;
  font-size: 15px;
}

.brand-text {
  letter-spacing: -0.3px;
}

/* Language Picker */
.lang-picker {
  display: flex;
  align-items: center;
  gap: 4px;
}

.tb-select {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 13px;
  font-weight: 500;
  border-radius: 6px;
  padding: 4px 8px;
  outline: none;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tb-select:hover, .tb-select:focus {
  border-color: var(--accent-blue);
}

.tb-icon-btn {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s ease;
}

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

#btn-shortcuts {
  font-size: 15px;
  line-height: 1;
}

/* Execution Stepper Pill */
.stepper-pill {
  display: flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.pill-btn-nav {
  background: transparent;
  border: none;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-main);
  padding: 4px 10px;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.15s;
}

.pill-btn-nav:hover {
  background: var(--bg-hover);
  color: var(--accent-blue);
}

.pill-btn-nav.primary {
  background: var(--accent-blue);
  color: #ffffff;
}

.pill-btn-nav.primary:hover {
  background: #0858b9;
}

#current-line-badge {
  font-family: var(--code-font-family);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-yellow);
  padding: 3px 10px;
  cursor: pointer;
  border-radius: 12px;
  transition: all 0.2s;
}

#current-line-badge.active {
  background: #fef3c7;
  color: #92400e;
}

/* Annotate Mode Toggle Pill */
.tb-draw-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #ffffff;
  border: 1px solid #d0d7de;
  color: var(--text-main);
  font-size: 13px;
  font-weight: 600;
  border-radius: 20px;
  padding: 4px 12px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.tb-draw-pill .draw-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #94a3b8;
  transition: all 0.2s ease;
}

.tb-draw-pill:hover {
  border-color: #0969da;
  color: #0969da;
}

.tb-draw-pill.active {
  background: #0969da;
  border-color: #0969da;
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(9, 105, 218, 0.3);
}

.tb-draw-pill.active .draw-dot {
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
}

/* Segmented Control for Views */
.segmented-control {
  display: flex;
  background: #e2e8f0;
  border-radius: 6px;
  padding: 2px;
}

.segment-btn {
  background: transparent;
  border: none;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.segment-btn.active {
  background: #ffffff;
  color: var(--text-main);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

/* Zoom Pill */
.zoom-pill {
  display: flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
}

.zoom-btn {
  background: transparent;
  border: none;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  cursor: pointer;
  color: var(--text-main);
  transition: background 0.15s;
}

.zoom-btn:hover {
  background: var(--bg-hover);
  color: var(--accent-blue);
}

/* Subtle Action Buttons */
.session-btns {
  display: flex;
  gap: 4px;
}

.tb-btn-subtle {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 9px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tb-btn-subtle:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: var(--bg-hover);
}

/* ==========================================================================
   Modern Floating Whiteboard Palette (Bottom Dock)
   ========================================================================== */
.whiteboard-floating-dock {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 36px;
  padding: 6px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10002;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.06);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.whiteboard-floating-dock.hidden {
  transform: translateX(-50%) translateY(90px);
  opacity: 0;
  pointer-events: none;
}

.dock-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-draw-tool {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-main);
  font-size: 13px;
  font-weight: 500;
  border-radius: 20px;
  padding: 5px 11px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s ease;
}

.btn-draw-tool:hover {
  background: var(--bg-hover);
}

.btn-draw-tool.active {
  background: #e7f3ff;
  border-color: #0969da;
  color: #0969da;
  font-weight: 600;
}

.dock-divider {
  width: 1px;
  height: 20px;
  background-color: var(--border-color);
}

.dock-colors {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-color-pick {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  cursor: pointer;
  padding: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform 0.15s ease;
}

.btn-color-pick:hover {
  transform: scale(1.18);
}

.btn-color-pick.active {
  border-color: #0969da;
  box-shadow: 0 0 0 2px #0969da;
  transform: scale(1.24);
}

.dock-actions {
  display: flex;
  align-items: center;
  gap: 5px;
}

.dock-btn-icon {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.dock-btn-close {
  background: #cf222e;
  border: none;
  color: #ffffff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 16px;
  padding: 5px 12px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.dock-btn-close:hover {
  background: #a41b24;
}

/* Circular Eraser Indicator */
#eraser-cursor-indicator {
  position: fixed;
  width: 40px;
  height: 40px;
  border: 2px dashed #cf222e;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 10001;
  background: rgba(207, 34, 46, 0.12);
}

/* Glowing Pulsating Laser Pointer Cursor */
#laser-cursor-indicator {
  position: fixed;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background-color: #ff0033;
  border: 1.5px solid #ffffff;
  box-shadow: 0 0 8px #ff0033, 0 0 16px #ff0033, 0 0 24px rgba(255, 0, 51, 0.7);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 10001;
  display: none;
  will-change: left, top;
  animation: laserGlowPulse 1s infinite alternate ease-in-out;
}

@keyframes laserGlowPulse {
  0% {
    box-shadow: 0 0 6px #ff0033, 0 0 12px #ff0033, 0 0 18px rgba(255, 0, 51, 0.6);
  }
  100% {
    box-shadow: 0 0 10px #ff0033, 0 0 20px #ff0033, 0 0 30px rgba(255, 0, 51, 0.9);
  }
}

/* ==========================================================================
   Main Workspace Layout
   ========================================================================== */
#workspace-container {
  display: flex;
  height: calc(100vh - var(--toolbar-height));
  width: 100vw;
  position: relative;
}

/* Left Column: Code Editor & Output */
#left-column {
  flex: 0 0 60%;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 260px;
  overflow: hidden;
  background-color: var(--bg-primary);
}

/* Right Column: Call Stack */
#right-column {
  flex: 0 0 40%;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 240px;
  overflow: hidden;
  background-color: var(--bg-secondary);
}

/* Panes */
#editor-pane {
  flex: 0 0 65%;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  background-color: #ffffff;
}

/* Output Pane - High-Contrast Dark Console Theme */
#output-pane {
  flex: 0 0 35%;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  background-color: #0d1117;
  border-top: 1px solid #30363d;
  overflow: hidden;
}

#output-pane .pane-header {
  background-color: #161b22;
  border-bottom: 1px solid #30363d;
  color: #8b949e;
}

#output-pane .pane-title {
  color: #f0f6fc;
}

#output-pane .terminal-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--code-font-family);
  font-size: 11px;
  font-weight: 700;
  color: #3fb950;
  background: rgba(63, 185, 80, 0.15);
  border: 1px solid rgba(63, 185, 80, 0.3);
  padding: 1px 5px;
  border-radius: 4px;
  letter-spacing: 0;
}

#output-pane .pane-mini-btn {
  background: #21262d;
  border: 1px solid #363b42;
  color: #c9d1d9;
}

#output-pane .pane-mini-btn:hover {
  background: #30363d;
  color: #58a6ff;
  border-color: #58a6ff;
}

.pane-header {
  height: 30px;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
}

.pane-title {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
}

.pane-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hint-text {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: none;
}

.pane-mini-btn {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 11px;
  font-weight: 500;
  border-radius: 4px;
  padding: 2px 7px;
  cursor: pointer;
  transition: all 0.15s;
}

.pane-mini-btn:hover {
  background: var(--bg-hover);
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

/* Output Textarea - Sleek Dark Terminal Aesthetic */
#output-text {
  flex: 1;
  width: 100%;
  background: #0d1117;
  color: #e6edf3;
  caret-color: #58a6ff;
  border: none;
  outline: none;
  padding: 12px 14px;
  font-family: var(--code-font-family);
  font-size: var(--editor-font-size);
  line-height: 1.55;
  resize: none;
  user-select: text;
  font-variant-ligatures: none !important;
  -webkit-font-variant-ligatures: none !important;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
}

#output-text::placeholder {
  color: #6e7681;
  font-style: italic;
}

#output-text::selection {
  background: rgba(56, 139, 253, 0.4);
  color: #ffffff;
}

#output-text::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

#output-text::-webkit-scrollbar-track {
  background: #0d1117;
}

#output-text::-webkit-scrollbar-thumb {
  background: #30363d;
  border-radius: 4px;
}

#output-text::-webkit-scrollbar-thumb:hover {
  background: #484f58;
}

/* ==========================================================================
   Splitters
   ========================================================================== */
.splitter {
  background-color: var(--border-color);
  z-index: 10;
  transition: background-color 0.2s;
}

.splitter:hover, .splitter.active {
  background-color: var(--accent-blue);
}

#main-splitter {
  width: 6px;
  cursor: col-resize;
  flex-shrink: 0;
}

#editor-splitter {
  height: 6px;
  cursor: row-resize;
  flex-shrink: 0;
}

body.resizing-col {
  cursor: col-resize !important;
  user-select: none;
}

body.resizing-row {
  cursor: row-resize !important;
  user-select: none;
}

/* ==========================================================================
   CodeMirror Light Theme Custom Styling & Gutter Pointer
   ========================================================================== */
.CodeMirror {
  height: 100% !important;
  font-family: var(--code-font-family) !important;
  font-size: var(--editor-font-size) !important;
  line-height: 1.5 !important;
  background-color: #ffffff !important;
  color: #24292f;
}

/* Ligature suppression for CodeMirror lines & text (without overriding token colors) */
.CodeMirror,
.CodeMirror pre.CodeMirror-line,
.CodeMirror pre.CodeMirror-line-like,
.CodeMirror-lines,
.CodeMirror-line,
.CodeMirror-code {
  font-variant-ligatures: none !important;
  -webkit-font-variant-ligatures: none !important;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
}

/* ==========================================================================
   Syntax Highlighting Colors (Modern Vibrant Light Theme)
   ========================================================================== */
.cm-s-default .cm-keyword,
.cm-keyword {
  color: #cf222e !important; /* GitHub Red/Crimson for keywords: for, while, if, else, return */
  font-weight: 600 !important;
}

.cm-s-default .cm-type,
.cm-type {
  color: #0550ae !important; /* Royal Blue for types: void, int, float, double, char, bool, vector */
  font-weight: 600 !important;
}

.cm-s-default .cm-builtin,
.cm-builtin {
  color: #8250df !important; /* Vivid Purple for builtins: cout, cin, endl, print, range */
  font-weight: 600 !important;
}

.cm-s-default .cm-string,
.cm-s-default .cm-string-2,
.cm-string {
  color: #0a3069 !important; /* Dark Navy Blue for strings: "Nhap so phan tu: " */
}

.cm-s-default .cm-number,
.cm-number {
  color: #116329 !important; /* Emerald Green for numbers: 0, 1, 23 */
  font-weight: 500 !important;
}

.cm-s-default .cm-comment,
.cm-comment {
  color: #6e7781 !important; /* Muted Slate Gray for comments */
  font-style: italic !important;
}

.cm-s-default .cm-meta,
.cm-meta {
  color: #953800 !important; /* Burnt Orange for preprocessors (#include, #define) */
  font-weight: 500 !important;
}

.cm-s-default .cm-operator,
.cm-operator {
  color: #d73a49 !important; /* Red/Coral for operators: <<, >>, ++, =, <, > */
}

.cm-s-default .cm-def,
.cm-def {
  color: #0969da !important; /* Function/method definitions: NhapMang */
  font-weight: 600 !important;
}

.cm-s-default .cm-variable,
.cm-s-default .cm-variable-2,
.cm-s-default .cm-variable-3 {
  color: #24292f;
}

.CodeMirror-gutters {
  background-color: #f6f8fa !important;
  border-right: 1px solid var(--border-color) !important;
  padding-right: 4px;
}

.CodeMirror-linenumber {
  color: #8c959f !important;
  padding: 0 8px 0 5px !important;
  cursor: pointer;
}

.CodeMirror-linenumber:hover {
  color: var(--accent-pointer) !important;
  font-weight: bold;
}

/* Execution Gutter & Arrow */
.execution-gutter {
  width: 22px;
}

.execution-arrow-marker {
  color: #d97706;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  animation: pointerPulse 1.2s infinite alternate ease-in-out;
  cursor: pointer;
  filter: drop-shadow(0 0 3px rgba(217, 119, 6, 0.6));
}

@keyframes pointerPulse {
  0% { transform: translateX(0); }
  100% { transform: translateX(3px); }
}

/* Highlight of current executing line in Light Theme */
.current-line-highlight {
  background-color: rgba(245, 158, 11, 0.16) !important;
  border-left: 3px solid #d97706;
}

/* Syntax Token Colors (Light Theme / High Readability) */
.cm-keyword { color: #cf222e !important; font-weight: bold; }
.cm-builtin { color: #953800 !important; font-weight: 500; }
.cm-type { color: #0550ae !important; font-weight: 600; }
.cm-string { color: #0a3069 !important; }
.cm-number { color: #0550ae !important; }
.cm-comment { color: #6e7781 !important; font-style: italic; }
.cm-operator { color: #0969da !important; font-weight: 500; }
.cm-def { color: #8250df !important; font-weight: 600; }
.cm-variable { color: #24292f !important; }
.cm-meta { color: #953800 !important; font-weight: bold; }

/* ==========================================================================
   Call Stack Table Grid (Light Theme)
   ========================================================================== */
#stack-pane {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

#stack-table-container {
  flex: 1;
  overflow: auto;
  padding: 0;
  background-color: #ffffff;
}

.stack-table-wrapper {
  min-width: 100%;
  display: inline-block;
}

.stack-grid-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--code-font-family);
  font-size: calc(var(--editor-font-size) - 2px);
  font-variant-ligatures: none !important;
  -webkit-font-variant-ligatures: none !important;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
}

.stack-grid-table th {
  background: var(--bg-tertiary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 6px 8px;
  font-weight: 600;
  text-align: left;
  position: sticky;
  top: 0;
  z-index: 5;
}

.col-row-number {
  width: 40px;
  text-align: center !important;
  color: var(--text-dim) !important;
}

.col-row-action {
  width: 36px;
}

.th-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
}

.th-title {
  cursor: pointer;
  flex: 1;
}

.btn-del-col {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  cursor: pointer;
  line-height: 1;
  padding: 0 3px;
  border-radius: 2px;
}

.btn-del-col:hover {
  color: var(--accent-red);
  background: rgba(207, 34, 46, 0.15);
}

.stack-grid-table td {
  border: 1px solid var(--border-color);
  padding: 0;
  background-color: #ffffff;
}

.td-row-number {
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
  background-color: var(--bg-secondary) !important;
  user-select: none;
}

.td-row-action {
  text-align: center;
  background-color: var(--bg-secondary) !important;
}

.btn-del-row {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 2px;
}

.btn-del-row:hover {
  color: var(--accent-red);
  background: rgba(207, 34, 46, 0.15);
}

.cell-input {
  width: 100%;
  height: 100%;
  min-height: 34px;
  background: transparent;
  border: none;
  outline: none;
  color: #1e293b;
  font-family: var(--code-font-family);
  font-size: inherit;
  padding: 4px 8px;
  user-select: text;
  font-variant-ligatures: none !important;
  -webkit-font-variant-ligatures: none !important;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
}

.cell-input:focus {
  background-color: #f0f7ff;
  box-shadow: inset 0 0 0 2px var(--accent-blue);
  color: #0969da;
  font-weight: 500;
}

/* ==========================================================================
   Fullscreen Drawing Canvas Overlay
   ========================================================================== */
#whiteboard-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  pointer-events: none;
  touch-action: none;
}

#whiteboard-canvas.draw-mode-active {
  pointer-events: auto;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f6f8fa;
}

::-webkit-scrollbar-thumb {
  background: #d0d7de;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #afb8c1;
}

/* ==========================================================================
   Custom Non-Native Toast Notifications
   ========================================================================== */
#custom-toast-container {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 20000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.custom-toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 8px;
  background: #ffffff;
  border: 1px solid #d0d7de;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
  font-size: 13px;
  font-weight: 500;
  color: #1f2328;
  opacity: 0;
  transform: translateY(-8px);
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  min-width: 240px;
  max-width: 380px;
}

.custom-toast.toast-visible {
  opacity: 1;
  transform: translateY(0);
}

.custom-toast.toast-hiding {
  opacity: 0;
  transform: translateY(-8px) scale(0.95);
}

.custom-toast.toast-success { border-left: 4px solid #1a7f37; }
.custom-toast.toast-error { border-left: 4px solid #cf222e; }
.custom-toast.toast-warning { border-left: 4px solid #d97706; }
.custom-toast.toast-info { border-left: 4px solid #0969da; }

.toast-icon {
  font-size: 15px;
  flex-shrink: 0;
}

.toast-text {
  flex: 1;
  line-height: 1.4;
  word-break: break-word;
}

.toast-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  cursor: pointer;
  padding: 0 2px;
  line-height: 1;
}

.toast-close:hover {
  color: #cf222e;
}

/* ==========================================================================
   Custom Non-Native Modal Dialog & Backdrop
   ========================================================================== */
.modal-backdrop {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  background: rgba(15, 23, 42, 0.45) !important;
  backdrop-filter: blur(4px) !important;
  -webkit-backdrop-filter: blur(4px) !important;
  z-index: 19999 !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  opacity: 1;
  transition: opacity 0.2s ease;
}

.modal-backdrop.hidden {
  display: none !important;
}

.custom-modal-card {
  background: #ffffff;
  border-radius: 12px;
  width: 90%;
  max-width: 420px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.05);
  border: 1px solid #d0d7de;
  overflow: hidden;
  animation: modalScaleIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalScaleIn {
  0% { transform: scale(0.92); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid #e2e8f0;
  background: #f8fafc;
}

.modal-title {
  font-size: 15px;
  font-weight: 600;
  color: #1f2328;
}

.modal-close-x {
  background: transparent;
  border: none;
  font-size: 20px;
  color: #64748b;
  cursor: pointer;
  line-height: 1;
}

.modal-close-x:hover {
  color: #cf222e;
}

.modal-body {
  padding: 18px;
}

.modal-message {
  font-size: 13.5px;
  line-height: 1.5;
  color: #334155;
}

.modal-input-wrap {
  margin-top: 14px;
}

.modal-input-wrap.hidden {
  display: none;
}

.modal-text-input {
  width: 100%;
  padding: 8px 12px;
  font-size: 14px;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  outline: none;
  color: #0f172a;
  transition: all 0.15s;
  font-variant-ligatures: none !important;
  -webkit-font-variant-ligatures: none !important;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0 !important;
}

.modal-text-input:focus {
  border-color: #0969da;
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.18);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 18px;
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
}

.modal-btn {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.modal-btn-secondary {
  background: #ffffff;
  border: 1px solid #d0d7de;
  color: #334155;
}

.modal-btn-secondary:hover {
  background: #f1f5f9;
}

.modal-btn-primary {
  background: #0969da;
  border: 1px solid #0969da;
  color: #ffffff;
}

.modal-btn-primary:hover {
  background: #0858b9;
}

.modal-btn-danger {
  background: #cf222e !important;
  border-color: #cf222e !important;
  color: #ffffff !important;
}

.modal-btn-danger:hover {
  background: #a41b24 !important;
}

/* ==========================================================================
   Shortcuts Cheatsheet Modal Styling
   ========================================================================== */
.shortcuts-modal-card {
  max-width: 680px;
  width: 94%;
}

.shortcuts-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.shortcuts-os-tabs {
  display: flex;
  background: #e2e8f0;
  border-radius: 6px;
  padding: 2px;
  gap: 2px;
}

.shortcuts-os-tab {
  border: none;
  background: transparent;
  font-size: 11px;
  font-weight: 600;
  color: #64748b;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.shortcuts-os-tab:hover {
  color: #0f172a;
}

.shortcuts-os-tab.active {
  background: #ffffff;
  color: #0969da;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  max-height: 65vh;
  overflow-y: auto;
  padding: 2px;
}

@media (max-width: 620px) {
  .shortcuts-grid {
    grid-template-columns: 1fr;
  }
}

.shortcuts-category {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 10px 14px;
}

.shortcuts-cat-title {
  font-size: 11.5px;
  font-weight: 700;
  color: #475569;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 0;
  border-bottom: 1px dashed #e2e8f0;
  font-size: 12.5px;
  color: #1e293b;
}

.shortcut-row:last-child {
  border-bottom: none;
}

.shortcut-keys {
  display: flex;
  align-items: center;
  gap: 3px;
  flex-shrink: 0;
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  font-family: var(--code-font-family);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.2;
  color: #1e293b;
  background-color: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.08), inset 0 1px 0 #ffffff;
}