/* ==========================================================================
   FocusFlow — ADHD Bionic Speed Reader Stylesheet
   ========================================================================== */

:root {
  --font-lexend: 'Lexend', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-atkinson: 'Atkinson Hyperlegible', sans-serif;
  --font-inter: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-cairo: 'Cairo', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-noto-arabic: 'Noto Sans Arabic', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-tajawal: 'Tajawal', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Sizing and Dynamic Vars */
  --reader-font-size: 19px;
  --reader-line-height: 1.8;
  --reader-max-width: 70ch;
  --tail-opacity: 0.9;
  --bold-weight: 750;

  /* Toolker Retro-Brutalist Hardware Palette */
  --bg-app: #d8d2c4;
  --bg-card: #e4dfd3;
  --bg-card-subtle: #ded8cb;
  --text-main: #1c1d20;
  --text-bold: #16171a;
  --text-muted: #636056;
  --border-color: #1c1d20;
  --border-focus: #cf573c;
  --accent-color: #cf573c;
  --accent-hover: #a83f2a;
  --accent-light: #f4ebe8;
  --accent-text: #ffffff;
  --shadow-sm: 2px 2px 0px #18191c;
  --shadow-md: 4px 4px 0px #18191c;
  --shadow-lg: 5px 5px 0px #18191c;
  --ruler-bg: rgba(207, 87, 60, 0.15);
  --ruler-border: rgba(207, 87, 60, 0.7);
  --orp-color: #cf573c;
}

:is(body, .focus-flow-root).theme-light {
  --bg-app: #d8d2c4;
  --bg-card: #e4dfd3;
  --bg-card-subtle: #ded8cb;
  --text-main: #1c1d20;
  --text-bold: #16171a;
  --text-muted: #636056;
  --border-color: #1c1d20;
  --border-focus: #cf573c;
  --accent-color: #cf573c;
  --accent-hover: #a83f2a;
  --accent-light: #f4ebe8;
  --accent-text: #ffffff;
  --shadow-sm: 2px 2px 0px #18191c;
  --shadow-md: 4px 4px 0px #18191c;
  --shadow-lg: 5px 5px 0px #18191c;
  --ruler-bg: rgba(207, 87, 60, 0.15);
  --ruler-border: rgba(207, 87, 60, 0.7);
  --orp-color: #cf573c;
}

/* Warm Sepia Palette */
:is(body, .focus-flow-root).theme-sepia {
  --bg-app: #f4ecd8;
  --bg-card: #fdfaf2;
  --bg-card-subtle: #ede2c8;
  --text-main: #382e23;
  --text-bold: #1d160f;
  --text-muted: #786650;
  --border-color: #dfd1b3;
  --border-focus: #b45309;
  --accent-color: #b45309;
  --accent-hover: #92400e;
  --accent-light: #fef3c7;
  --accent-text: #ffffff;
  --ruler-bg: rgba(180, 83, 9, 0.12);
  --ruler-border: rgba(180, 83, 9, 0.60);
  --orp-color: #dc2626;
}

/* Calming Sage Matcha Palette */
:is(body, .focus-flow-root).theme-matcha {
  --bg-app: #eef3eb;
  --bg-card: #f9fbf8;
  --bg-card-subtle: #e2ebd9;
  --text-main: #273620;
  --text-bold: #162211;
  --text-muted: #5e7054;
  --border-color: #d1dfc7;
  --border-focus: #4d7c0f;
  --accent-color: #4d7c0f;
  --accent-hover: #3f6212;
  --accent-light: #ecfccb;
  --accent-text: #ffffff;
  --ruler-bg: rgba(77, 124, 15, 0.12);
  --ruler-border: rgba(77, 124, 15, 0.60);
  --orp-color: #b91c1c;
}

/* Midnight Dark Slate Palette */
:is(body, .focus-flow-root).theme-dark {
  --bg-app: #0b1120;
  --bg-card: #131c31;
  --bg-card-subtle: #1e293b;
  --text-main: #cbd5e1;
  --text-bold: #ffffff;
  --text-muted: #94a3b8;
  --border-color: #27354f;
  --border-focus: #60a5fa;
  --accent-color: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-light: #1e3a8a;
  --accent-text: #ffffff;
  --ruler-bg: rgba(96, 165, 250, 0.15);
  --ruler-border: rgba(96, 165, 250, 0.65);
  --orp-color: #f87171;
}

/* High Contrast Cyber OLED Palette */
:is(body, .focus-flow-root).theme-cyber {
  --bg-app: #050505;
  --bg-card: #101014;
  --bg-card-subtle: #1a1a22;
  --text-main: #d1d5db;
  --text-bold: #f59e0b; /* Amber bold fixation points */
  --text-muted: #8b949e;
  --border-color: #2a2a35;
  --border-focus: #06b6d4;
  --accent-color: #f59e0b;
  --accent-hover: #d97706;
  --accent-light: #451a03;
  --accent-text: #050505;
  --ruler-bg: rgba(245, 158, 11, 0.16);
  --ruler-border: rgba(245, 158, 11, 0.70);
  --orp-color: #fbbf24;
}

/* Base Styles */
.focus-flow-root,
.focus-flow-root *,
.focus-flow-root *::before,
.focus-flow-root *::after {
  box-sizing: border-box;
}

.focus-flow-root {
  min-height: 100vh;
  background-color: var(--bg-app);
  color: var(--text-main);
  transition: background-color 0.25s ease, color 0.25s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:is(body, .focus-flow-root).font-lexend { font-family: var(--font-lexend); }
:is(body, .focus-flow-root).font-atkinson { font-family: var(--font-atkinson); }
:is(body, .focus-flow-root).font-inter { font-family: var(--font-inter); }
:is(body, .focus-flow-root).font-serif { font-family: var(--font-serif); }
:is(body, .focus-flow-root).font-mono { font-family: var(--font-mono); }
:is(body, .focus-flow-root).font-cairo { font-family: var(--font-cairo); }
:is(body, .focus-flow-root).font-noto-arabic { font-family: var(--font-noto-arabic); }
:is(body, .focus-flow-root).font-tajawal { font-family: var(--font-tajawal); }

/* Live Preview Font Typefaces for Font Comparison List */
.preview-font-lexend { font-family: var(--font-lexend) !important; }
.preview-font-atkinson { font-family: var(--font-atkinson) !important; }
.preview-font-inter { font-family: var(--font-inter) !important; }
.preview-font-serif { font-family: var(--font-serif) !important; }
.preview-font-mono { font-family: var(--font-mono) !important; }
.preview-font-cairo { font-family: var(--font-cairo) !important; }
.preview-font-noto-arabic { font-family: var(--font-noto-arabic) !important; }
.preview-font-tajawal { font-family: var(--font-tajawal) !important; }

/* Language Pills */
.lang-pills {
  display: inline-flex;
  align-items: center;
  background: var(--bg-card);
  padding: 2px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  gap: 2px;
}

.lang-pill {
  padding: 3px 8px;
  font-size: 0.74rem;
  font-weight: 700;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-pill:hover {
  color: var(--text-bold);
}

.lang-pill.active {
  background: var(--accent-light);
  color: var(--accent-color);
}

/* RTL Layout & Typography */
[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

[dir="rtl"] #rawInput {
  direction: rtl;
  text-align: right;
  font-family: var(--font-cairo), var(--font-noto-arabic), sans-serif;
  line-height: 1.9;
}

[dir="rtl"] .bionic-article {
  direction: rtl;
  text-align: right;
  font-family: var(--font-cairo), var(--font-noto-arabic), sans-serif;
  line-height: 2.0;
}

[dir="rtl"] .bionic-article blockquote {
  border-left: none;
  border-right: 3px solid var(--accent-color);
  padding-left: 0;
  padding-right: 16px;
}

[dir="rtl"] .bionic-article ul, [dir="rtl"] .bionic-article ol {
  padding-left: 0;
  padding-right: 24px;
}

/* App Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1700px;
  margin: 0 auto;
  padding: 16px 24px;
  gap: 16px;
}

/* Header */
.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 4px 4px 0px #18191c;
}

.header-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-telemetry {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 2px;
}

.telemetry-pill {
  font-family: var(--font-mono), monospace;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #5c5950;
  text-transform: uppercase;
}

.telemetry-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #3d7a4d;
  display: inline-block;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.instrument-heading {
  font-family: var(--font-mono), monospace;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #16171a;
  text-transform: uppercase;
  margin: 0;
}

.brand-logo {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-bold);
  display: flex;
  align-items: center;
}

.logo-bold {
  color: var(--accent-color);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.logo-accent {
  color: var(--accent-color);
}

.tagline {
  font-family: var(--font-mono), monospace;
  font-size: 0.72rem;
  color: #636056;
  margin-top: 2px;
}

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

/* Badges & Pills */
.badge {
  font-family: var(--font-mono), monospace;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 4px;
}

.badge-accent {
  background: #cf573c;
  color: #ffffff;
  border: 1px solid #a83f2a;
}

/* Cloud Cross-Device Sync Status Button */
.cloud-sync-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: #16171a;
  border: 2px solid #2b2c32;
  color: #ebe6d8;
  font-family: var(--font-mono), monospace;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 6px;
  box-shadow: 2px 2px 0px #18191c;
  cursor: pointer;
  transition: all 0.1s ease;
  user-select: none;
}

.cloud-sync-btn:hover {
  background: #222329;
  border-color: #3e414c;
  color: #ffffff;
}

.cloud-sync-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 0px 0px 0px #18191c;
}

.cloud-sync-btn.is-synced {
  color: #4ade80;
  border-color: #1c1d20;
  background: #16171a;
}

.cloud-sync-btn.is-synced svg {
  stroke: #4ade80;
}

.cloud-sync-btn.is-syncing {
  color: var(--accent-color);
  border-color: var(--accent-color);
  background: #16171a;
}

.cloud-sync-btn.is-syncing svg {
  animation: cloud-spin 1s linear infinite;
}

@keyframes cloud-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Segmented Control (View Modes) */
.segmented-control {
  display: inline-flex;
  background: #16171a;
  padding: 3px;
  border-radius: 6px;
  border: 2px solid #2b2c32;
  box-shadow: inset 1px 1px 3px rgba(0,0,0,0.8);
}

.seg-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-family: var(--font-mono), monospace;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #7a776e;
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.seg-btn:hover {
  color: #ebe6d8;
}

.seg-btn.active {
  background: var(--accent-color);
  color: #ffffff;
  box-shadow: 2px 2px 0px #18191c;
}

/* Theme Dots */
.theme-picker {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 9px;
  background: #16171a;
  border-radius: 6px;
  border: 2px solid #2b2c32;
}

.theme-dot {
  width: 17px;
  height: 17px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.theme-dot:hover {
  transform: scale(1.15);
}

.theme-dot.active {
  border-color: #ffffff;
  transform: scale(1.15);
}

.theme-light-dot { background: #cf573c; }
.theme-sepia-dot { background: #b45309; }
.theme-matcha-dot { background: #4d7c0f; }
.theme-dark-dot { background: #1e293b; }
.theme-cyber-dot { background: #f59e0b; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-mono), monospace;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 6px;
  border: 2px solid var(--border-color);
  box-shadow: 2px 2px 0px #18191c;
  cursor: pointer;
  transition: all 0.1s ease;
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 0px 0px 0px #18191c;
}

.btn-sm {
  padding: 4px 9px;
  font-size: 0.74rem;
}

.btn-secondary {
  background: #24262c;
  color: #ebe6d8;
  border-color: #1c1d20;
}

.btn-secondary:hover {
  background: #32353e;
  color: #ffffff;
}

.btn-accent {
  background: var(--accent-color);
  color: #ffffff;
  border-color: #1c1d20;
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
  box-shadow: none;
}

.btn-ghost:hover {
  background: var(--bg-card-subtle);
  border-color: var(--border-color);
  box-shadow: 2px 2px 0px #18191c;
  color: var(--text-bold);
}

.text-danger:hover {
  color: #ef4444 !important;
}

.icon-btn {
  padding: 8px;
}

/* Icons */
.icon {
  width: 18px;
  height: 18px;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.icon-xs {
  width: 14px;
  height: 14px;
}

/* Settings Drawer / Panel */
.settings-panel {
  display: block;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 16px 20px;
  box-shadow: 4px 4px 0px #18191c;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.settings-panel.collapsed {
  display: none;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px 24px;
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.setting-val {
  color: var(--accent-color);
  font-weight: 700;
}

/* Sliders & Forms */
.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  background: #16171a;
  border: 2px solid #1c1d20;
  border-radius: 2px;
  outline: none;
  margin: 8px 0;
  cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 18px;
  background: #cf573c;
  border: 2px solid #1c1d20;
  box-shadow: 1px 1px 0px #18191c;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.1s ease;
}

.range-slider::-webkit-slider-thumb:hover {
  background: #a83f2a;
}

.range-slider::-webkit-slider-thumb:active {
  background: #872e1c;
  transform: scale(1.08);
}

.range-slider::-moz-range-thumb {
  width: 16px;
  height: 18px;
  background: #cf573c;
  border: 2px solid #1c1d20;
  box-shadow: 1px 1px 0px #18191c;
  border-radius: 2px;
  cursor: pointer;
}

.range-slider::-moz-range-track {
  height: 8px;
  background: #16171a;
  border: 2px solid #1c1d20;
  border-radius: 2px;
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono), monospace;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
}

.form-select, .select-micro {
  font-family: var(--font-mono), 'Space Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 6px 10px;
  border-radius: 4px;
  border: 2px solid #1c1d20;
  box-shadow: 2px 2px 0px #18191c;
  background: #ded8cb;
  color: #1c1d20;
  outline: none;
  cursor: pointer;
  transition: all 0.1s ease;
}

.form-select:hover, .select-micro:hover {
  background: #d5cec0;
}

.form-select:focus, .select-micro:focus {
  border-color: #cf573c;
  box-shadow: 2px 2px 0px #cf573c;
}

.select-micro {
  padding: 5px 8px;
  font-size: 0.74rem;
}

/* Custom Font Picker with Live Font Previews */
.font-picker-dropdown {
  position: relative;
  width: 100%;
}

.font-picker-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 10px;
  font-family: var(--font-mono), 'Space Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  background: #ded8cb;
  border: 2px solid #1c1d20;
  box-shadow: 2px 2px 0px #18191c;
  border-radius: 4px;
  color: #1c1d20;
  cursor: pointer;
  transition: all 0.1s ease;
  text-align: left;
}

.font-picker-trigger:hover {
  background: #d5cec0;
}

.font-picker-trigger:focus-visible {
  border-color: #cf573c;
  box-shadow: 2px 2px 0px #cf573c;
}

.font-trigger-content {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  overflow: hidden;
}

.font-trigger-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 600;
  font-size: 0.85rem;
}

.font-picker-trigger .chevron-icon {
  width: 15px;
  height: 15px;
  color: var(--text-muted);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

.font-picker-dropdown.is-open .font-picker-trigger {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px var(--accent-light);
}

.font-picker-dropdown.is-open .chevron-icon {
  transform: rotate(180deg);
}

.font-picker-menu {
  position: absolute;
  top: calc(100% + 5px);
  left: 0;
  width: 100%;
  min-width: 260px;
  max-width: min(340px, calc(100vw - 32px));
  max-height: 380px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  box-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.2), 0 4px 6px -2px rgba(0, 0, 0, 0.08);
  z-index: 999;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.font-picker-menu.hidden {
  display: none !important;
}

.font-group-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 6px 8px 3px;
  margin-top: 4px;
}

.font-group-label:first-child {
  margin-top: 0;
}

.font-option-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  user-select: none;
  background: transparent;
}

.font-option-item:hover {
  background: var(--bg-card-subtle);
  transform: translateX(2px);
}

.font-option-item:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: -1px;
  background: var(--bg-card-subtle);
}

.font-option-item.is-selected {
  background: var(--accent-light);
  border-color: var(--accent-color);
}

.font-option-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.font-option-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-bold);
  flex: 1;
}

.font-badge {
  font-size: 0.67rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-card-subtle);
  color: var(--text-muted);
  white-space: nowrap;
}

.font-option-item.is-selected .font-badge {
  background: var(--accent-color);
  color: var(--accent-text);
}

.font-option-item .check-icon {
  width: 15px;
  height: 15px;
  color: var(--accent-color);
  opacity: 0;
  flex-shrink: 0;
  transition: opacity 0.15s ease;
}

.font-option-item.is-selected .check-icon {
  opacity: 1;
}

.font-option-specimen {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.font-option-item.is-selected .font-option-specimen {
  color: var(--text-main);
  font-weight: 500;
}

/* Screen reader / accessible hidden utility */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Toggle Switch */
.toggle-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toggle-switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.toggle-switch input {
  display: none;
}

.switch-slider {
  width: 36px;
  height: 20px;
  background: #16171a;
  border: 2px solid #1c1d20;
  border-radius: 3px;
  position: relative;
  transition: background-color 0.15s ease;
  box-shadow: 1px 1px 0px #18191c;
}

.switch-slider::before {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  left: 2px;
  top: 2px;
  background: #ded8cb;
  border: 1px solid #1c1d20;
  border-radius: 2px;
  transition: transform 0.15s ease;
}

.toggle-switch input:checked + .switch-slider {
  background: #3d7a4d;
}

.toggle-switch input:checked + .switch-slider::before {
  transform: translateX(16px);
  background: #ffffff;
}

.switch-label {
  font-family: var(--font-mono), monospace;
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-main);
}

/* Workspace */
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  flex: 1;
  min-height: 580px;
}

/* Single focus mode layout */
.workspace.focus-mode {
  grid-template-columns: 1fr;
}

.workspace.focus-mode .input-pane {
  display: none;
}

.workspace.focus-mode .reader-pane {
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: 4px 4px 0px #18191c;
  border-radius: 8px;
}

.workspace.focus-mode .reader-scroll-area {
  display: flex;
  justify-content: center;
}

/* Panes */
.pane {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 4px 4px 0px #18191c;
  transition: all 0.2s ease;
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 2px solid var(--border-color);
  background: var(--bg-card-subtle);
}

.pane-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono), monospace;
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-bold);
}

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

.pane-tools .btn {
  background: #ded8cb;
  color: #1c1d20;
  border: 2px solid #1c1d20;
  box-shadow: 2px 2px 0px #18191c;
  font-family: var(--font-mono), monospace;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  border-radius: 4px;
  padding: 5px 10px;
  transition: all 0.1s ease;
}

.pane-tools .btn:hover {
  background: #c5bfb0;
  color: #16171a;
}

.pane-tools .btn:active {
  transform: translate(1px, 1px);
  box-shadow: 0px 0px 0px #18191c;
}

.pane-tools #btnTtsPlay {
  background: #cf573c !important;
  color: #ffffff !important;
}

.pane-tools #btnTtsPlay:hover {
  background: #a83f2a !important;
}

.pane-tools #btnTtsStop {
  background: #b91c1c !important;
  color: #ffffff !important;
}

.pane-tools #btnOpenBrainGym {
  background: #476171 !important;
  color: #ffffff !important;
}

.pane-tools #btnOpenBrainGym:hover {
  background: #374c59 !important;
}

.pane-tools .text-danger {
  color: #b91c1c !important;
}

.pane-tools .text-danger:hover {
  background: #fee2e2 !important;
}

#ttsSpeed {
  min-width: 58px;
}

.textarea-wrapper {
  flex: 1;
  display: flex;
  padding: 16px;
}

#rawInput {
  width: 100%;
  height: 100%;
  min-height: 440px;
  border: none;
  outline: none;
  resize: none;
  background: transparent;
  color: var(--text-main);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.7;
  padding: 4px;
}

#rawInput::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.pane-footer {
  padding: 10px 18px;
  border-top: 2px solid var(--border-color);
  background: var(--bg-card-subtle);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.stats-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bullet {
  opacity: 0.5;
}

/* Reader Canvas */
.reader-scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: 24px 28px;
  position: relative;
}

.bionic-article {
  margin: 0 auto;
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  color: var(--text-main);
  word-break: break-word;
  background: #fdfaf2;
  border: 2px solid #1c1d20;
  box-shadow: 4px 4px 0px #18191c;
  border-radius: 6px;
  padding: 28px 36px;
  transition: font-size 0.15s ease, line-height 0.15s ease;
}

/* Width options */
.bionic-article.width-narrow { max-width: 55ch; }
.bionic-article.width-medium { max-width: 70ch; }
.bionic-article.width-wide { max-width: 85ch; }
.bionic-article.width-full { max-width: 100%; }

.bionic-article p {
  margin-bottom: 1.4em;
}

.bionic-article h1, .bionic-article h2, .bionic-article h3 {
  color: var(--text-bold);
  margin-top: 1.5em;
  margin-bottom: 0.8em;
  line-height: 1.3;
}

.bionic-article blockquote {
  border-left: 3px solid var(--accent-color);
  padding-left: 16px;
  margin: 1.4em 0;
  color: var(--text-muted);
  font-style: italic;
}

.bionic-article ul, .bionic-article ol {
  padding-left: 24px;
  margin-bottom: 1.4em;
}

.bionic-article li {
  margin-bottom: 0.4em;
}

/* KaTeX Math & Formulas */
.katex-display-wrapper {
  margin: 1.2em 0;
  padding: 12px 18px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow-x: auto;
  text-align: center;
  transition: all 0.2s ease;
  user-select: text;
}

.katex-display-wrapper:hover {
  border-color: var(--border-focus);
}

.katex-display-wrapper .katex-display {
  margin: 0 !important;
}

.katex-inline-wrapper {
  display: inline-block;
  padding: 0 4px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.04);
  vertical-align: baseline;
}

body.theme-dark .katex-inline-wrapper,
body.theme-cyber .katex-inline-wrapper {
  background: rgba(255, 255, 255, 0.08);
}

.katex {
  font-size: 1.08em;
  color: var(--text-bold) !important;
}

/* Bionic Formatting */
.bionic-bold {
  font-weight: var(--bold-weight);
  color: var(--text-bold);
  letter-spacing: -0.01em;
}

.bionic-tail {
  font-weight: 400;
  color: var(--text-main);
  opacity: var(--tail-opacity);
}

/* Subtle word dimming toggle */
body.subtle-dimming .bionic-tail {
  opacity: 0.65;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 70px 20px;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 14px;
}

.empty-state h3 {
  font-size: 1.25rem;
  color: var(--text-bold);
  margin-bottom: 8px;
}

.empty-state p {
  max-width: 440px;
  margin: 0 auto;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Reading Ruler Guide (ADHD Eye Guide) */
.reading-ruler {
  position: fixed;
  left: 0;
  width: 100vw;
  height: 42px;
  top: 45%;
  background: var(--ruler-bg);
  border-top: 2px solid var(--ruler-border);
  border-bottom: 2px solid var(--ruler-border);
  pointer-events: none;
  z-index: 998;
  transform: translateY(-50%);
  transition: opacity 0.18s ease;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.08);
}

.reading-ruler::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--accent-color);
  box-shadow: 0 0 8px var(--accent-color);
}

.reading-ruler.hidden {
  display: none !important;
}

.btn-ghost.active {
  background: var(--accent-light);
  color: var(--accent-color);
  border-color: var(--accent-color);
  font-weight: 600;
}

.link-btn-text {
  background: none;
  border: none;
  padding: 0 2px;
  color: var(--accent-color);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
  display: inline;
}

.link-btn-text:hover {
  color: var(--accent-hover);
  text-decoration-thickness: 2px;
}

/* Audio Controls */
.audio-controls {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-right: 4px;
}

.max-w-voice {
  max-width: 140px;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .max-w-voice {
    max-width: 90px;
  }
}

/* Interactive Bionic Sentences */
.bionic-sentence {
  display: inline;
  border-radius: 4px;
  padding: 1px 2px;
  margin: -1px -2px;
  transition: background-color 0.15s ease, box-shadow 0.15s ease;
  cursor: pointer;
}

.bionic-sentence:hover {
  background-color: rgba(59, 130, 246, 0.08);
}

/* TTS Spoken Highlighting (Bimodal Reading) */
.tts-active-sentence {
  background-color: var(--accent-light) !important;
  color: var(--text-bold) !important;
  box-shadow: 0 0 0 2px var(--accent-color), 0 2px 8px rgba(0,0,0,0.06);
  border-radius: 4px;
  padding: 2px 4px;
  margin: -2px -4px;
  transition: all 0.2s ease;
}

body.theme-sepia .tts-active-sentence {
  background-color: #fef3c7 !important;
  box-shadow: 0 0 0 2px #b45309;
}

body.theme-matcha .tts-active-sentence {
  background-color: #ecfccb !important;
  box-shadow: 0 0 0 2px #4d7c0f;
}

body.theme-dark .tts-active-sentence {
  background-color: rgba(59, 130, 246, 0.25) !important;
  box-shadow: 0 0 0 2px #60a5fa;
}

body.theme-cyber .tts-active-sentence {
  background-color: rgba(245, 158, 11, 0.22) !important;
  box-shadow: 0 0 0 2px #f59e0b;
}

/* Modal & Dialogs Base */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.modal-card,
.rsvp-card,
.sentence-focus-card {
  width: 100%;
  max-width: 760px;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  padding: 24px 28px;
  box-shadow: 6px 6px 0px #18191c;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  max-height: 92vh;
  overflow-y: auto;
}

.modal-header,
.rsvp-header,
.focus-player-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title-group,
.rsvp-title-group,
.focus-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-close {
  background: transparent;
  border: none;
  font-size: 1.7rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color 0.15s ease;
}

.btn-close:hover {
  color: var(--text-bold);
}

/* Sentence Focus Mode Switcher */
.focus-mode-switcher-container {
  display: flex;
  justify-content: center;
  width: 100%;
}

.focus-mode-selector {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 4px;
}

.focus-mode-selector .seg-btn {
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Sentence Focus Stage (Contextual Peek & Focal Card) */
.sentence-stage {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.sentence-peek {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 0.92rem;
  line-height: 1.45;
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
  user-select: none;
  display: flex;
  align-items: baseline;
  gap: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sentence-peek:hover,
.sentence-peek:focus-visible {
  opacity: 0.9;
  border-color: var(--accent-color);
  background: var(--bg-card);
}

.peek-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-color);
  flex-shrink: 0;
}

.peek-content {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sentence-focal-box {
  min-height: 130px;
  max-height: min(55vh, 420px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #8a8477 transparent;
  background: #fdfaf2;
  border: 2px solid #1c1d20;
  border-radius: 8px;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 3px 3px 0px #18191c;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, max-height 0.2s ease;
}

.sentence-focal-box::-webkit-scrollbar {
  width: 6px;
}

.sentence-focal-box::-webkit-scrollbar-thumb {
  background: #8a8477;
  border-radius: 4px;
}

.sentence-focal-box.is-speaking {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(207, 87, 60, 0.35), 3px 3px 0px #18191c;
}

.sentence-focal-content {
  font-size: 1.55rem;
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: #1c1d20;
  user-select: text;
  text-align: center;
  width: 100%;
  transition: font-size 0.2s ease, line-height 0.2s ease;
}

.sentence-focal-box .bionic-bold {
  color: #16171a !important;
  font-weight: 800 !important;
}

.sentence-focal-box .bionic-tail {
  color: #2b2c32 !important;
  opacity: 0.95 !important;
}

.sentence-focal-content[dir="rtl"] {
  text-align: right;
  direction: rtl;
}

/* Toolbar & Floating Shadow Buttons (YouTube Shadowing Mechanics) */
.btn-shadow-trigger {
  background: #24262c;
  color: #ebe6d8;
  border-color: #1c1d20;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  user-select: none;
  touch-action: manipulation;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-shadow-trigger .shadow-mic-icon {
  color: #cf573c;
  transition: transform 0.15s ease;
}

.btn-shadow-trigger:hover .shadow-mic-icon {
  transform: scale(1.15);
}

.btn-shadow-trigger.is-recording {
  background: #b91c1c !important;
  color: #ffffff !important;
  border-color: #7f1d1d !important;
  box-shadow: 0 0 12px rgba(185, 28, 28, 0.75) !important;
}

.btn-shadow-trigger.is-recording .shadow-mic-icon {
  color: #ffffff !important;
  animation: pulse-shadow-mic 0.7s infinite alternate;
}

@keyframes pulse-shadow-mic {
  0% { transform: scale(1); opacity: 0.7; }
  100% { transform: scale(1.25); opacity: 1; }
}

.float-btn-shadow {
  background: #24262c;
  color: #cf573c;
  border: 1px solid #1c1d20;
  display: flex;
  align-items: center;
  justify-content: center;
}

.float-btn-shadow:hover {
  background: #32353e;
  color: #e0684e;
}

.float-btn-shadow.is-recording {
  background: #b91c1c !important;
  color: #ffffff !important;
  box-shadow: 0 0 12px rgba(185, 28, 28, 0.85) !important;
  animation: pulse-shadow-mic 0.7s infinite alternate;
}

.float-btn-partner {
  background: #1e293b;
  color: #60a5fa;
  border: 1px solid #3b82f6;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.float-btn-partner.has-new {
  animation: partner-glow 1.5s infinite;
}

.btn-partner-shadow {
  background: #16171a;
  color: #60a5fa;
  border: 2px solid #2563eb;
  box-shadow: 2px 2px 0px #18191c;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.btn-partner-shadow:hover {
  background: #1e2430;
  color: #93c5fd;
}

.btn-partner-shadow.has-new {
  animation: partner-glow 1.5s infinite;
}

@keyframes partner-glow {
  0%, 100% { border-color: #3b82f6; box-shadow: 0 0 6px rgba(59, 130, 246, 0.6), 2px 2px 0px #18191c; }
  50% { border-color: #60a5fa; box-shadow: 0 0 12px rgba(96, 165, 250, 0.9), 2px 2px 0px #18191c; }
}

.pulse-partner-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3b82f6;
  display: inline-block;
  box-shadow: 0 0 4px #60a5fa;
}

/* The Timeline: Scrubber, Progress & Stats */
.sentence-timeline-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.timeline-slider-wrapper {
  position: relative;
  height: 20px;
  display: flex;
  align-items: center;
  width: 100%;
}

.timeline-progress-track {
  position: absolute;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  overflow: hidden;
  pointer-events: none;
}

.timeline-progress-bar {
  height: 100%;
  background: var(--accent-color);
  border-radius: 999px;
  transition: width 0.15s ease;
}

.timeline-slider {
  position: absolute;
  left: 0;
  right: 0;
  width: 100%;
  height: 20px;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
  margin: 0;
}

.sentence-stats-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.mode-status-pill {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--accent-color);
}

/* Controls: < (Prev), Replay, Start/Pause, > (Next), Speed */
.focus-controls-wrapper {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.focus-btn-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.focus-play-btn {
  padding: 10px 28px;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 125px;
}

.focus-speed-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.focus-speed-row .range-slider {
  max-width: 200px;
}

.focus-keyboard-hint {
  text-align: center;
  font-size: 0.74rem;
  color: var(--text-muted);
}

kbd {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px 5px;
  font-family: inherit;
  font-size: 0.75rem;
}

/* Quick Paste Modal */
.paste-card {
  max-width: 620px;
  gap: 16px;
}

.paste-modal-instruction {
  font-size: 0.88rem;
  color: var(--text-main);
  margin-top: -4px;
}

.paste-modal-instruction kbd {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  padding: 2px 7px;
  border-radius: 5px;
  font-family: inherit;
  font-weight: 700;
  color: var(--accent-color);
}

.paste-modal-input-wrap {
  width: 100%;
}

.paste-modal-textarea {
  width: 100%;
  min-height: 180px;
  max-height: 340px;
  background: var(--bg-card-subtle);
  border: 1.5px solid var(--border-color);
  border-radius: 12px;
  padding: 14px 16px;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.92rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.paste-modal-textarea:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.paste-modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 4px;
}

.paste-permission-tip {
  font-size: 0.76rem;
  color: var(--text-muted);
  max-width: 330px;
  line-height: 1.35;
}

.paste-btn-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--text-bold);
  color: var(--bg-card);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  animation: slideIn 0.25s ease forwards;
}

@keyframes slideIn {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.hidden {
  display: none !important;
}

/* Floating Quick Audio Controller (Tiny Float Play/Pause Bar) */
.floating-tts-bar {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: #16171a;
  border: 2px solid #1c1d20;
  box-shadow: 4px 4px 0px #18191c;
  padding: 6px 12px 6px 8px;
  border-radius: 6px;
  z-index: 1500;
  transition: all 0.15s ease;
  cursor: pointer;
}

.floating-tts-bar:hover {
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0px #18191c;
}

.float-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  border: 2px solid #1c1d20;
  box-shadow: 1px 1px 0px #18191c;
  cursor: pointer;
  transition: all 0.1s ease;
}

.float-btn:active {
  transform: translate(1px, 1px);
  box-shadow: none;
}

.float-btn-primary {
  background: #cf573c;
  color: #ffffff;
}

.float-btn-primary:hover {
  background: #a83f2a;
}

.float-btn-primary.is-playing {
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(207, 87, 60, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(207, 87, 60, 0); }
  100% { box-shadow: 0 0 0 0 rgba(207, 87, 60, 0); }
}

.float-btn-subtle {
  background: #24262c;
  color: #ebe6d8;
}

.float-btn-subtle:hover {
  background: #32353e;
}

.float-info {
  display: flex;
  align-items: center;
  padding: 0 6px;
  font-family: var(--font-mono), monospace;
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #ebe6d8;
  letter-spacing: 0.05em;
}

.float-clickable-zone {
  cursor: pointer;
  user-select: none;
  padding: 4px 6px 4px 2px;
  border-radius: 999px;
  transition: opacity 0.15s ease;
}

.float-clickable-zone:hover {
  opacity: 0.8;
}

.float-clickable-zone:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 1px;
}

#floatStatusLabel {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .floating-tts-bar {
    bottom: 16px;
    right: 16px;
    padding: 4px 8px 4px 4px;
  }
}

/* Responsive Behavior */
@media (max-width: 960px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  #rawInput {
    min-height: 240px;
  }
}

/* ==========================================================================
   Brain Gym (Gemini Smart Games, Critical Quizzes & 3D Flashcards)
   ========================================================================== */

.brain-gym-trigger-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.brain-gym-trigger-btn:hover {
  transform: translateY(-1px);
  border-color: var(--border-color-hover);
  background: var(--bg-card-subtle);
  color: var(--text-bold);
}

.brain-gym-trigger-btn.is-thinking {
  cursor: wait;
  opacity: 0.9;
  border-color: var(--accent-color);
  color: var(--accent-color);
  background: var(--bg-card);
  animation: btn-pulse 1.6s ease-in-out infinite;
}

@keyframes btn-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4);
  }
  50% {
    box-shadow: 0 0 0 5px rgba(37, 99, 235, 0);
  }
}

.btn-brain-spinner {
  animation: btn-spin 0.85s linear infinite;
  display: inline-block;
  vertical-align: middle;
}

@keyframes btn-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.brain-gym-trigger-btn.is-ready {
  border-color: #10b981;
  color: var(--text-bold);
  box-shadow: 0 1px 6px rgba(16, 185, 129, 0.25);
}

.ready-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: #10b981;
  color: #ffffff;
  font-size: 11px;
  font-weight: 800;
  margin-left: 2px;
  line-height: 1;
  animation: ready-pop 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes ready-pop {
  0% { transform: scale(0); opacity: 0; }
  80% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
}

.brain-gym-card {
  width: min(980px, 96vw);
  height: min(92vh, 880px);
  max-height: 95vh;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 6px 6px 0px #18191c;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modal-pop 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.brain-gym-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 22px;
  border-bottom: 2px solid var(--border-color);
  background: var(--bg-card);
  flex-shrink: 0;
  gap: 14px;
}

.brain-gym-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1 1 auto;
}

.brain-gym-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.brain-gym-brand h3 {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-bold);
  letter-spacing: -0.01em;
}

#brainGymTopicBadge {
  max-width: min(380px, 34vw);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-block;
  vertical-align: middle;
  font-size: 0.78rem;
}

.brain-gym-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

#brainCoverageBadge {
  white-space: nowrap;
  flex-shrink: 0;
  font-size: 0.76rem;
  font-weight: 600;
}

/* Tiny Audio Toggle */
.tiny-audio-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.16s ease;
  user-select: none;
}

.tiny-audio-toggle:hover {
  border-color: var(--border-color-hover);
  color: var(--text-main);
  background: var(--bg-card-subtle);
}

.tiny-audio-toggle.active {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.35);
  color: #047857;
}

body.theme-dark .tiny-audio-toggle.active {
  background: rgba(16, 185, 129, 0.18);
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}

/* Nav Bar & Mode Selector */
.brain-gym-nav-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 24px;
  background: var(--bg-card-subtle);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.brain-mode-selector {
  display: flex;
  gap: 4px;
  background: var(--bg-card);
  padding: 3px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.brain-mode-selector .seg-btn {
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 9px;
}

.brain-gym-actions-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}

.depth-toggle-wrapper {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2px;
}

.depth-pill {
  border: none;
  background: transparent;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.depth-pill.active {
  background: var(--accent-color);
  color: var(--accent-text);
}

/* Main Interactive Stage */
.brain-gym-stage {
  flex: 1 1 auto;
  min-height: 0;
  max-height: none;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  background: var(--bg-app);
  scroll-behavior: smooth;
  scrollbar-width: thin;
}

/* ==========================================================================
   Mode: Progressive Discovery Journey (Exhaustive Idea Odyssey)
   ========================================================================== */

.journey-stage-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  gap: 16px;
}

/* Roadmap Stepper Header */
.journey-roadmap-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-card);
  padding: 14px 18px;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.journey-header-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.journey-title-text {
  font-size: 0.96rem;
  font-weight: 800;
  color: var(--text-bold);
  display: flex;
  align-items: center;
  gap: 8px;
}

.journey-coverage-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  background: rgba(16, 185, 129, 0.12);
  color: #047857;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

body.theme-dark .journey-coverage-pill {
  color: #34d399;
  background: rgba(16, 185, 129, 0.2);
}

/* Horizontal Roadmap Stepper */
.journey-stepper-track {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding: 6px 2px;
  scrollbar-width: thin;
}

.journey-step-node {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid var(--border-color);
  background: var(--bg-card-subtle);
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

.journey-step-node:hover:not(:disabled) {
  border-color: var(--accent-color);
  color: var(--text-bold);
  transform: translateY(-1px);
}

.journey-step-node.is-active {
  border-color: var(--accent-color);
  background: var(--accent-light);
  color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.journey-step-node.is-unlocked {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.08);
  color: #047857;
}

body.theme-dark .journey-step-node.is-unlocked {
  color: #34d399;
}

.journey-step-node:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  border-style: dashed;
}

.journey-step-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 800;
  background: var(--bg-card);
}

.journey-step-node.is-unlocked .journey-step-num {
  background: #10b981;
  color: #ffffff;
}

.journey-step-node.is-active .journey-step-num {
  background: var(--accent-color);
  color: #ffffff;
}

/* Study Dilemma & Question Card */
.brain-scratcher-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 26px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.scratcher-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.scratcher-milestone-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.journey-dilemma-text {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-bold);
  line-height: 1.55;
  letter-spacing: -0.01em;
}

/* Click to read audio indicator */
[data-tts-read] {
  cursor: pointer;
}

[data-tts-read]:hover {
  text-decoration-color: var(--border-color-hover);
}

/* Hypothesis Choices */
.hypothesis-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hypothesis-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  text-align: left;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  font-size: 0.94rem;
  line-height: 1.5;
  color: var(--text-main);
}

.hypothesis-btn:hover:not(:disabled) {
  border-color: var(--border-color-hover);
  background: var(--bg-card-subtle);
  transform: translateX(3px);
}

.hypothesis-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.76rem;
  font-weight: 800;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-top: 2px;
}

.hypothesis-btn.is-correct {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.12) !important;
  color: #047857 !important;
  font-weight: 600;
}

.hypothesis-btn.is-correct .hypothesis-letter {
  background: #10b981;
  color: #ffffff;
  border-color: #10b981;
}

.hypothesis-btn.is-distractor {
  border-color: #f87171 !important;
  background: rgba(239, 68, 68, 0.08) !important;
  color: #b91c1c !important;
}

.hypothesis-btn.is-distractor .hypothesis-letter {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
}

/* Epiphany Reveal Card */
.epiphany-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px 24px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid rgba(16, 185, 129, 0.3);
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.1);
  animation: modal-pop 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.epiphany-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.epiphany-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.epiphany-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 800;
  color: #047857;
  background: rgba(16, 185, 129, 0.15);
  padding: 4px 10px;
  border-radius: 8px;
}

body.theme-dark .epiphany-badge {
  color: #34d399;
  background: rgba(16, 185, 129, 0.25);
}

.epiphany-text {
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-bold);
}

/* Source Spotlight Card */
.source-spotlight-box {
  padding: 12px 16px;
  background: var(--bg-card-subtle);
  border-radius: 12px;
  border-left: 4px solid #10b981;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.spotlight-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  font-weight: 800;
  color: #047857;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

body.theme-dark .spotlight-label-row {
  color: #34d399;
}

.spotlight-snippet {
  font-size: 0.9rem;
  font-style: italic;
  line-height: 1.5;
  color: var(--text-main);
}

.btn-spotlight-canvas {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-color);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.btn-spotlight-canvas:hover {
  background: var(--accent-light);
}

/* Curiosity Bridge / Next Milestone */
.curiosity-bridge-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.06), rgba(139, 92, 246, 0.06));
  border: 1px dashed rgba(59, 130, 246, 0.35);
  border-radius: 14px;
}

.bridge-title {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-color);
  display: flex;
  align-items: center;
  gap: 6px;
}

.bridge-teaser {
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--text-main);
  font-style: italic;
}

.journey-action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 4px;
}

.journey-complete-banner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  padding: 28px 24px;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(59, 130, 246, 0.08));
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 16px;
}

.journey-complete-icon {
  font-size: 2.4rem;
  line-height: 1;
}

.journey-complete-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-bold);
}

.journey-complete-desc {
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--text-main);
  max-width: 500px;
}

/* 3D Flashcards */
.flashcard-stage-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
}

.flashcard-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 620px;
}

.flashcard-progress-pill {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
}

.flashcard-3d-wrapper {
  perspective: 1200px;
  width: 100%;
  max-width: 620px;
  min-height: 280px;
  cursor: pointer;
}

.flashcard-card-inner {
  position: relative;
  width: 100%;
  min-height: 280px;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
}

.flashcard-card-inner.is-flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-sizing: border-box;
}

.flashcard-face-back {
  transform: rotateY(180deg);
  background: var(--bg-card-subtle);
  border-color: var(--border-focus);
}

.flashcard-prompt-label {
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-color);
  margin-bottom: 8px;
}

.flashcard-question-text {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-bold);
  margin: auto 0;
}

.flashcard-tap-hint {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-color);
  padding-top: 10px;
  margin-top: 12px;
}

.flashcard-model-box {
  margin: auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.flashcard-model-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-bold);
  line-height: 1.4;
}

.flashcard-mechanism-text {
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--text-main);
  background: var(--bg-card);
  padding: 12px 14px;
  border-radius: 10px;
  border-left: 3px solid var(--accent-color);
}

.flashcard-analogy-text {
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--text-muted);
  font-style: italic;
}

.flashcard-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 620px;
  gap: 12px;
}

.flashcard-rating-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-rate-fuzzy {
  border-color: #fca5a5 !important;
  color: #dc2626 !important;
}

.btn-rate-fuzzy:hover {
  background: #fef2f2 !important;
}

.btn-rate-mastered {
  border-color: #86efac !important;
  color: #16a34a !important;
}

.btn-rate-mastered:hover {
  background: #f0fdf4 !important;
}

/* Critical Quiz View */
.quiz-stage-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  gap: 16px;
}

.quiz-scenario-card {
  padding: 20px 24px;
  background: var(--bg-card);
  border-radius: 14px;
  border: 1px solid var(--border-color);
  border-left: 5px solid var(--accent-color);
  box-shadow: var(--shadow-sm);
}

.quiz-question-number {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--accent-color);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.quiz-scenario-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-bold);
  line-height: 1.5;
}

.quiz-options-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-option-button {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-main);
}

.quiz-option-button:hover:not(:disabled) {
  border-color: var(--accent-color);
  background: var(--accent-light);
  transform: translateX(3px);
}

.quiz-option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.76rem;
  font-weight: 800;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-top: 2px;
}

.quiz-option-button.is-correct {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.12) !important;
  color: #047857 !important;
  font-weight: 600;
}

.quiz-option-button.is-correct .quiz-option-letter {
  background: #10b981;
  color: #ffffff;
  border-color: #10b981;
}

.quiz-option-button.is-wrong {
  border-color: #ef4444 !important;
  background: rgba(239, 68, 68, 0.1) !important;
  color: #b91c1c !important;
}

.quiz-option-button.is-wrong .quiz-option-letter {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
}

.quiz-feedback-box {
  padding: 16px 20px;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid #10b981;
  animation: modal-pop 0.2s ease;
}

.quiz-feedback-box.is-wrong-box {
  border-left-color: #f59e0b;
}

.quiz-feedback-title {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--text-bold);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.quiz-feedback-explanation {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-main);
  margin-bottom: 8px;
}

.quiz-critical-takeaway {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent-color);
  padding: 6px 10px;
  background: var(--bg-card-subtle);
  border-radius: 6px;
}

/* Truth Detective View */
.detective-stage-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  gap: 16px;
}

.detective-intro-box {
  padding: 14px 18px;
  background: var(--bg-card-subtle);
  border-radius: 12px;
  border: 1px dashed var(--border-color);
}

.detective-goal {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-bold);
  margin-bottom: 4px;
}

.detective-premise {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.detective-cards-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.detective-statement-card {
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

.detective-statement-card:hover:not(:disabled) {
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.detective-statement-card.trap-caught {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.12) !important;
}

.detective-statement-card.false-alarm {
  border-color: #ef4444 !important;
  background: rgba(239, 68, 68, 0.1) !important;
}

.detective-statement-card.solid-truth {
  border-color: #3b82f6 !important;
  background: rgba(59, 130, 246, 0.08) !important;
}

.detective-reveal-card {
  padding: 16px 20px;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  animation: modal-pop 0.2s ease;
}

.fallacy-header-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.fallacy-pill {
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.fallacy-reason-text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-main);
}

/* Neural Connector / Concept Match */
.match-stage-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  gap: 16px;
}

.match-instructions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.match-grid-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.match-tile-btn {
  padding: 16px;
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-radius: 12px;
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text-main);
  transition: all 0.16s ease;
  user-select: none;
}

.match-tile-btn:hover:not(:disabled) {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

.match-tile-btn.is-selected {
  border-color: var(--accent-color);
  background: var(--accent-light);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
  transform: scale(1.02);
}

.match-tile-btn.is-matched {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.12) !important;
  color: #047857 !important;
  pointer-events: none !important;
  opacity: 0.8;
  transform: scale(0.98);
}

.match-success-banner {
  padding: 16px;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid #10b981;
  text-align: center;
  color: #047857;
  font-weight: 700;
  animation: modal-pop 0.25s ease;
}

/* Loading & Empty States */
.brain-gym-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  text-align: center;
  gap: 16px;
}

.brain-pulse-ring {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-color);
  animation: pulse-ring 1.8s infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.5rem;
}

.brain-loading-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-bold);
}

.brain-loading-sub {
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 420px;
  line-height: 1.5;
}

.brain-gym-footer {
  padding: 12px 24px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.brain-hint-text {
  font-size: 0.78rem;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  .brain-gym-card {
    width: 100vw;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
  }

  .brain-gym-nav-bar {
    padding: 8px 14px;
  }

  .brain-mode-selector .seg-btn {
    padding: 4px 8px;
    font-size: 0.75rem;
  }

  .match-grid-container {
    grid-template-columns: 1fr;
  }
}

/* Print Stylesheet */
@media print {
  .app-header, .settings-panel, .input-pane, .pane-header, .pane-footer, .reading-ruler, .modal-backdrop, .toast, .floating-tts-bar {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #000000 !important;
  }

  .app-container, .workspace, .reader-pane, .reader-scroll-area {
    padding: 0 !important;
    margin: 0 !important;
    border: none !important;
    box-shadow: none !important;
  }

  .bionic-article {
    max-width: 100% !important;
    font-size: 14pt !important;
    line-height: 1.7 !important;
  }

  .bionic-bold {
    font-weight: 800 !important;
    color: #000000 !important;
  }

  .bionic-tail {
    color: #333333 !important;
  }
}