/* ==========================================================================
   A Tour of Raptor - 1:1 Classic "Tour of Go" Design System
   ========================================================================== */

:root {
  /* Exact Colors from Tour of Go Reference */
  --go-header-teal: #007d9c;
  --go-header-teal-dark: #006780;
  
  --go-bar-bg: #e0ebf5;
  --go-bar-border: #cddbe8;
  
  --go-editor-bg: #ffffea;
  --go-editor-gutter: #ffffea;
  --go-editor-text: #1a1a1a;
  
  --go-btn-blue: #375eab;
  --go-btn-blue-hover: #2c4c8d;
  --go-btn-gray: #dce5ef;
  --go-btn-gray-border: #c0d0e0;
  --go-btn-gray-hover: #cfddec;
  
  --go-link-blue: #375eab;
  
  --text-dark: #222222;
  --text-muted: #666666;
  --text-dim: #999999;
  
  --font-sans: 'Open Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
}

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

body {
  background-color: #ffffff;
  color: var(--text-dark);
  font-family: var(--font-sans);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   1. Tour of Go Deep Teal Header Bar (#007d9c)
   ========================================================================== */

.tour-header {
  height: 48px;
  background-color: var(--go-header-teal);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  flex-shrink: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.go-logo-cluster {
  display: flex;
  align-items: center;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1.25rem;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.header-logo-img {
  margin-right: 8px;
  vertical-align: middle;
  border-radius: 3px;
}

.go-speed-lines {
  font-family: monospace;
  font-size: 1.3rem;
  margin-right: 2px;
  opacity: 0.9;
}

.go-logo-text {
  font-weight: 800;
  letter-spacing: 0.05em;
  font-size: 1.05rem;
}

.tour-app-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.85);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #f59e0b;
}

.status-dot.ready {
  background: #34d399;
}

/* Stepper Navigation */
.header-nav-stepper {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: rgba(0, 0, 0, 0.15);
  padding: 3px 6px;
  border-radius: 4px;
}

.header-stepper-btn {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  width: 24px;
  height: 24px;
  border-radius: 3px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.header-stepper-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.header-lesson-select {
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-dark);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.page-counter-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.9);
  padding: 0 4px;
}

/* Icons */
.header-icons {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-icon-btn {
  background: transparent;
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  opacity: 0.9;
  padding: 4px;
  border-radius: 3px;
  transition: opacity 0.15s ease;
}

.header-icon-btn:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.12);
}

/* ==========================================================================
   2. Tour 50/50 Split Container
   ========================================================================== */

.tour-main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* LEFT PANE (50%): Reading Material (#ffffff) */
.tour-narrative-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: #ffffff;
  border-right: 1px solid #d0dbe5;
  overflow: hidden;
}

.narrative-content-scroll {
  flex: 1;
  padding: 2.25rem 2.75rem;
  overflow-y: auto;
}

.tour-heading {
  font-size: 1.65rem;
  font-weight: 700;
  color: #111827;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.tour-body-text {
  font-size: 0.95rem;
  line-height: 1.65;
  color: #2c3e50;
}

.tour-body-text p {
  margin-bottom: 1.15rem;
}

.tour-indent-p {
  padding-left: 1.5rem;
  margin-bottom: 1.15rem;
}

.tour-blue-link {
  color: var(--go-link-blue);
  cursor: pointer;
  font-weight: 600;
  text-decoration: underline;
}

.tour-body-text code {
  background: #f1f5f9;
  color: var(--go-btn-blue);
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.88rem;
  border: 1px solid #e2e8f0;
}

.tour-body-text kbd {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-bottom: 2px solid #94a3b8;
  padding: 1px 6px;
  border-radius: 3px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
}

/* RIGHT PANE (50%): Interactive Editor & Controls */
.tour-interactive-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: #f8fafc;
  overflow: hidden;
}

/* Top File & Option Bar (#e0ebf5) */
.editor-top-bar {
  height: 38px;
  background-color: var(--go-bar-bg);
  border-bottom: 1px solid var(--go-bar-border);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 0 0.75rem;
}

.editor-tab-active {
  background-color: #ffffff;
  border: 1px solid var(--go-bar-border);
  border-bottom: 1px solid #ffffff;
  padding: 5px 16px;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: -1px;
}

.editor-top-options {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 5px;
}

.editor-option-pill {
  background: var(--go-btn-gray);
  border: 1px solid var(--go-btn-gray-border);
  color: var(--text-dark);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 3px;
  cursor: pointer;
}

.editor-option-pill:hover {
  background: var(--go-btn-gray-hover);
}

/* Editor Surface (#ffffea - Pale Buttercream Yellow) */
.editor-middle-area {
  flex: 1.2;
  display: flex;
  background-color: var(--go-editor-bg);
  overflow: hidden;
  position: relative;
}

.line-numbers-gutter {
  width: 38px;
  background-color: var(--go-editor-gutter);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  text-align: right;
  padding: 1rem 0.5rem 1rem 0;
  user-select: none;
  border-right: 1px solid rgba(0, 0, 0, 0.04);
}

.tour-editor-input {
  flex: 1;
  background-color: transparent;
  color: var(--go-editor-text);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  border: none;
  outline: none;
  resize: none;
  padding: 1rem 0.75rem;
  white-space: pre;
}

/* Bottom Action Bar (#e0ebf5) */
.editor-bottom-bar {
  height: 42px;
  background-color: var(--go-bar-bg);
  border-top: 1px solid var(--go-bar-border);
  border-bottom: 1px solid var(--go-bar-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.75rem;
}

.output-tab-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.view-switch-btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 3px;
  cursor: pointer;
}

.view-switch-btn:hover {
  color: var(--text-dark);
}

.view-switch-btn.active {
  background: var(--go-btn-gray);
  color: var(--go-btn-blue);
}

/* Action Buttons (Reset, Format, Run) */
.editor-action-buttons {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.action-btn-gray {
  background-color: var(--go-btn-gray);
  border: 1px solid var(--go-btn-gray-border);
  color: var(--text-dark);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.action-btn-gray:hover {
  background-color: var(--go-btn-gray-hover);
}

.action-btn-blue {
  background-color: var(--go-btn-blue);
  border: 1px solid var(--go-btn-blue);
  color: #ffffff;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.action-btn-blue:hover {
  background-color: var(--go-btn-blue-hover);
  border-color: var(--go-btn-blue-hover);
}

/* ==========================================================================
   3. Output Viewports Area
   ========================================================================== */

.tour-output-area {
  flex: 0.95;
  display: flex;
  flex-direction: column;
  background-color: #ffffff;
  overflow: hidden;
}

.output-view-pane {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow: hidden;
}

.output-view-pane.active {
  display: flex;
}

/* Console Output */
.output-terminal-text {
  flex: 1;
  padding: 0.85rem 1rem;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  background-color: #ffffff;
  color: #111827;
}

.terminal-entry {
  margin-bottom: 0.6rem;
  line-height: 1.5;
}

.terminal-input-line {
  color: var(--text-muted);
}

.terminal-output-line {
  color: #111827;
  white-space: pre-wrap;
}

.terminal-result-line {
  color: var(--go-btn-blue);
  font-weight: 600;
}

.terminal-error-line {
  color: #dc2626;
  background: #fef2f2;
  border: 1px solid #fecaca;
  padding: 4px 8px;
  border-radius: 3px;
  margin-top: 4px;
}

.repl-bottom-bar {
  height: 36px;
  background: #f8fafc;
  border-top: 1px solid var(--go-bar-border);
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  gap: 0.4rem;
}

.repl-prompt-symbol {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--go-btn-blue);
}

.repl-inline-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #111827;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.repl-clear-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid #cbd5e1;
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 3px;
  cursor: pointer;
}

.repl-clear-btn:hover {
  background: #e2e8f0;
  color: #111827;
}

/* Gutter Resizers (Split-Pane Drag Dividers) */
.gutter-resizer-h {
  width: 6px;
  background-color: var(--go-bar-bg);
  border-left: 1px solid var(--go-bar-border);
  border-right: 1px solid var(--go-bar-border);
  cursor: col-resize;
  user-select: none;
  z-index: 10;
  transition: background-color 0.15s ease;
  position: relative;
}

.gutter-resizer-h:hover,
.gutter-resizer-h.resizing {
  background-color: var(--go-teal-primary);
}

.gutter-resizer-v {
  height: 6px;
  background-color: var(--go-bar-bg);
  border-top: 1px solid var(--go-bar-border);
  border-bottom: 1px solid var(--go-bar-border);
  cursor: row-resize;
  user-select: none;
  z-index: 10;
  transition: background-color 0.15s ease;
  position: relative;
}

.gutter-resizer-v:hover,
.gutter-resizer-v.resizing {
  background-color: var(--go-teal-primary);
}

/* Canvas Toolbar & Controls */
.canvas-control-strip {
  padding: 0.35rem 0.75rem;
  background: var(--go-bar-bg);
  border-bottom: 1px solid var(--go-bar-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dark);
}

.canvas-size-btn-group {
  display: flex;
  gap: 0.3rem;
}

.canvas-size-btn {
  background: var(--go-btn-gray);
  border: 1px solid var(--go-btn-gray-border);
  color: var(--text-dark);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 3px;
  cursor: pointer;
}

.canvas-size-btn:hover,
.canvas-size-btn.active {
  background: var(--go-btn-blue);
  border-color: var(--go-btn-blue);
  color: #ffffff;
}

.canvas-dim-indicator {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Canvas Stage with Custom 2-Axis Scrollbars */
.canvas-center-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f1f5f9;
  padding: 1.5rem;
  overflow: auto;
  min-width: 100%;
  min-height: 100%;
}

.canvas-center-wrapper::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.canvas-center-wrapper::-webkit-scrollbar-track {
  background: #e2e8f0;
}

.canvas-center-wrapper::-webkit-scrollbar-thumb {
  background: #94a3b8;
  border-radius: 5px;
  border: 2px solid #e2e8f0;
}

.canvas-center-wrapper::-webkit-scrollbar-thumb:hover {
  background: #64748b;
}

#wasmCanvas {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  flex-shrink: 0;
}

#wasmWebGLCanvas {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  flex-shrink: 0;
  cursor: grab;
}

#wasmWebGLCanvas:active {
  cursor: grabbing;
}

/* DOM Viewport */
.dom-preview-wrapper {
  flex: 1;
  padding: 1.25rem;
  background: #ffffff;
  color: #111827;
  overflow-y: auto;
}

.dom-hint-text {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* PodLit Viewport */
.pod-action-strip {
  padding: 0.4rem 0.75rem;
  background: var(--go-bar-bg);
  border-bottom: 1px solid var(--go-bar-border);
  display: flex;
  gap: 0.4rem;
}

.pod-output-surface {
  flex: 1;
  padding: 1.25rem;
  background: #ffffff;
  overflow-y: auto;
  line-height: 1.6;
}

.pod-output-surface pre {
  background: #f1f5f9;
  padding: 0.75rem;
  border-radius: 3px;
  font-family: var(--font-mono);
  margin: 0.5rem 0;
  border: 1px solid #e2e8f0;
}