/* ══════════════════════════════════════════════
   CUBROID Common CSS — apps/shared/common.css
   v2.0 — Global-ready, improved settings & BLE
   All platforms share this foundation.
   ══════════════════════════════════════════════

   Usage:
     <link rel="stylesheet" href="../shared/common.css">
     (must be the FIRST stylesheet loaded)

   Sections:
     1. Reset & Foundation
     2. CSS Variables (Root = theme-default)
     3. Base Typography
     4. Intro Shell Components
     5. App Shell Components
     6. Age-Group Themes (kinder / advanced)
     7. Responsive
   ══════════════════════════════════════════════ */


/* ── 1. Reset & Foundation ──────────────────── */

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

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&family=Noto+Sans+KR:wght@400;500;600;700&family=Pretendard:wght@400;500;600;700&family=Gaegu:wght@400;700&family=Jua&family=JetBrains+Mono:wght@400;500&display=swap');


/* ── 2. CSS Variables (Root = theme-default) ── */

:root {
  /* Brand constants (never change) */
  --cb-brand-primary: #4A7FE0;
  --cb-brand-dark: #1B2A4A;
  --cb-brand-accent: #FF6B35;
  --cb-brand-logo-h: 40px;

  /* Theme-default values (초등 3-6학년 기본값) */
  --cb-font-display: 'Outfit', sans-serif;
  --cb-font-body: 'Pretendard', 'Noto Sans KR', sans-serif;
  --cb-font-mono: 'JetBrains Mono', monospace;
  --cb-font-size-base: 15px;
  --cb-font-size-title: 26px;
  --cb-font-size-subtitle: 14px;
  --cb-font-size-label: 12px;
  --cb-font-size-small: 11px;
  --cb-radius-lg: 16px;
  --cb-radius-md: 12px;
  --cb-radius-sm: 8px;
  --cb-radius-btn: 10px;
  --cb-spacing-sm: 8px;
  --cb-spacing: 16px;
  --cb-spacing-lg: 22px;
  --cb-btn-height: 46px;
  --cb-btn-font: 14px;
  --cb-touch-min: 44px;
  --cb-color-bg: #F4F6FB;
  --cb-color-surface: #FFFFFF;
  --cb-color-text: #1B2A4A;
  --cb-color-text2: #596880;
  --cb-color-border: #D1D9E6;
  --cb-color-primary: #3568C7;
  --cb-color-primary-light: #EBF1FF;
  --cb-color-accent: #FF6B35;
  --cb-color-on-primary: #FFFFFF;
  --cb-color-success: #22C55E;
  --cb-color-error: #EF4444;
  --cb-color-warning: #F59E0B;
  --cb-color-lang-card-bg: #FFFFFF;
  --cb-color-resource-bg: #F8FAFC;
  --cb-shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --cb-shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --cb-shadow-lg: 0 6px 24px rgba(27,42,74,0.08);
  --cb-overlay-bg: rgba(0,0,0,0.4);
  --cb-transition: 0.2s ease;

  /* Intro specific */
  --cb-intro-max-w: 520px;
  --cb-intro-padding: 40px 28px;
  --cb-lang-card-padding: 16px 20px;
  --cb-flag-size: 36px;
}


/* ── 3. Base Typography ─────────────────────── */

body {
  font-family: var(--cb-font-body);
  font-size: var(--cb-font-size-base);
  background: var(--cb-color-bg);
  color: var(--cb-color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.cb-text-primary { color: var(--cb-color-primary); }
.cb-text-muted { color: var(--cb-color-text2); }
.cb-bg-surface { background: var(--cb-color-surface); }
.cb-rounded { border-radius: var(--cb-radius-md); }
.cb-shadow { box-shadow: var(--cb-shadow-md); }


/* ── 4. Intro Shell Components ──────────────── */

.cb-intro {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: var(--cb-color-bg);
  position: relative;
  overflow: hidden;
}

.cb-intro::before {
  content: '';
  position: absolute;
  top: -40%; left: -20%;
  width: 140%; height: 140%;
  background: var(--cb-intro-bg-deco, radial-gradient(ellipse at 30% 20%, rgba(74,127,224,0.06) 0%, transparent 60%));
  pointer-events: none;
}

.cb-intro-card {
  position: relative;
  width: 100%;
  max-width: var(--cb-intro-max-w);
  background: var(--cb-color-surface);
  border-radius: var(--cb-radius-lg);
  box-shadow: var(--cb-shadow-lg);
  padding: var(--cb-intro-padding);
  text-align: center;
  animation: cb-fadeUp 0.5s ease;
  overflow: hidden;
}

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

/* Logo */
.cb-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: var(--cb-spacing);
}

.cb-logo-img {
  height: var(--cb-brand-logo-h);
  object-fit: contain;
}

.cb-logo-text {
  font-family: var(--cb-font-display);
  font-weight: 800;
  font-size: 22px;
  color: var(--cb-brand-dark);
  letter-spacing: -0.5px;
}
.cb-logo-text .brand { color: var(--cb-brand-primary); }

/* Title & Subtitle */
.cb-title {
  font-family: var(--cb-font-display);
  font-size: var(--cb-font-size-title);
  font-weight: 700;
  color: var(--cb-color-text);
  margin-bottom: 6px;
  line-height: 1.2;
}

.cb-subtitle {
  font-size: var(--cb-font-size-subtitle);
  color: var(--cb-color-text2);
  margin-bottom: var(--cb-spacing-lg);
}

/* Start Button */
.cb-btn-start {
  display: block;
  width: 100%;
  height: var(--cb-btn-height);
  margin-top: var(--cb-spacing);
  background: var(--cb-color-primary);
  color: var(--cb-color-on-primary);
  border: none;
  border-radius: var(--cb-radius-btn);
  font-family: var(--cb-font-body);
  font-size: var(--cb-btn-font);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--cb-transition);
}

.cb-btn-start:hover {
  filter: brightness(1.08);
  box-shadow: var(--cb-shadow-md);
  transform: translateY(-1px);
}

.cb-btn-start:active {
  transform: translateY(0);
  filter: brightness(0.95);
}

/* Version Badge */
.cb-version {
  display: inline-block;
  font-size: var(--cb-font-size-small);
  font-weight: 600;
  color: var(--cb-color-primary);
  background: var(--cb-color-primary-light);
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: var(--cb-spacing);
}

/* Section Label */
.cb-section-label {
  font-size: var(--cb-font-size-label);
  font-weight: 600;
  color: var(--cb-color-text2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: var(--cb-spacing-lg) 0 var(--cb-spacing) 0;
  text-align: left;
}

/* Language Cards (Intro — v2) */
.cb-lang-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cb-lang-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: var(--cb-lang-card-padding);
  background: var(--cb-color-lang-card-bg);
  border: 1.5px solid var(--cb-color-border);
  border-radius: var(--cb-radius-md);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: all var(--cb-transition);
  min-height: var(--cb-touch-min);
  font-family: var(--cb-font-body);
  text-align: left;
}

.cb-lang-card:hover {
  border-color: var(--cb-color-primary);
  box-shadow: var(--cb-shadow-sm);
  transform: translateY(-1px);
}

/* Auto-detected language card highlight */
.cb-lang-card.cb-lang-detected {
  border-color: var(--cb-color-primary);
  background: var(--cb-color-primary-light);
  box-shadow: 0 0 0 1px var(--cb-color-primary);
}

/* Selected animation */
.cb-lang-card.cb-lang-selected {
  transform: scale(0.97);
  opacity: 0.8;
  transition: all 0.1s ease;
}

.cb-lang-flag {
  width: var(--cb-flag-size);
  height: var(--cb-flag-size);
  font-size: calc(var(--cb-flag-size) - 8px);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--cb-color-bg);
  border-radius: 50%;
}

.cb-lang-info { flex: 1; text-align: left; }

.cb-lang-name {
  font-weight: 600;
  font-size: var(--cb-font-size-base);
  margin-bottom: 2px;
}

.cb-lang-desc {
  font-size: var(--cb-font-size-small);
  color: var(--cb-color-text2);
}

.cb-lang-arrow {
  font-size: 18px;
  color: var(--cb-color-text2);
  transition: transform var(--cb-transition);
}

.cb-lang-card:hover .cb-lang-arrow { transform: translateX(3px); }

/* Language Toggle (Method 2: expandable) */
.cb-lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--cb-spacing);
  padding: 8px 16px;
  border: none;
  background: none;
  color: var(--cb-color-text2);
  font-family: var(--cb-font-body);
  font-size: var(--cb-font-size-small);
  font-weight: 500;
  cursor: pointer;
  transition: color var(--cb-transition);
}

.cb-lang-toggle:hover {
  color: var(--cb-color-primary);
}

.cb-lang-toggle-arrow {
  font-size: 10px;
  transition: transform var(--cb-transition);
}

/* Expandable language picker */
.cb-lang-picker {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.2s ease, margin 0.3s ease;
  margin-top: 0;
}

.cb-lang-picker.open {
  max-height: 500px;
  opacity: 1;
  margin-top: var(--cb-spacing-sm);
}

/* Compact language button (inside picker) */
.cb-lang-compact {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--cb-color-lang-card-bg);
  border: 1.5px solid var(--cb-color-border);
  border-radius: var(--cb-radius-sm);
  cursor: pointer;
  font-family: var(--cb-font-body);
  color: inherit;
  text-align: left;
  transition: all var(--cb-transition);
  min-height: 40px;
  min-width: 0;
  overflow: hidden;
}

.cb-lang-compact:hover {
  border-color: var(--cb-color-primary);
  background: var(--cb-color-primary-light);
  transform: translateY(-1px);
}

.cb-lang-compact-code {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 20px; border-radius: 4px; flex-shrink: 0;
  font-size: 10px; font-weight: 700; letter-spacing: 0.5px;
  background: var(--cb-color-border); color: var(--cb-color-text);
}

.cb-lang-compact-name {
  font-weight: 600;
  font-size: var(--cb-font-size-small);
  white-space: nowrap;
  flex-shrink: 0;
}

.cb-lang-compact-title {
  font-size: calc(var(--cb-font-size-small) - 1px);
  color: var(--cb-color-text2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: none;
}

/* Show service title on wider screens */
@media (min-width: 420px) {
  .cb-lang-compact-title {
    display: block;
  }
}

/* Single column on very narrow */
@media (max-width: 380px) {
  .cb-lang-picker {
    grid-template-columns: 1fr;
  }
}

/* Kinder: bigger compact buttons */
[data-theme="kinder"] .cb-lang-compact {
  padding: 14px 18px;
  border-width: 2.5px;
  border-radius: var(--cb-radius-md);
  min-height: 52px;
}

[data-theme="kinder"] .cb-lang-compact-code { width: 34px; height: 24px; font-size: 12px; }
[data-theme="kinder"] .cb-lang-compact-name { font-size: var(--cb-font-size-label); }
[data-theme="kinder"] .cb-lang-toggle { font-size: var(--cb-font-size-label); }

/* Advanced: dark compact buttons */
[data-theme="advanced"] .cb-lang-compact {
  background: var(--cb-color-lang-card-bg);
  border-color: var(--cb-color-border);
}
[data-theme="advanced"] .cb-lang-compact:hover {
  background: rgba(108,138,255,0.08);
  border-color: var(--cb-color-primary);
}

/* Divider */
.cb-divider {
  border: none;
  border-top: 1px solid var(--cb-color-border);
  margin: var(--cb-spacing-lg) 0 0 0;
}

/* Resource / Teaching Guide Links */
.cb-resource-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.cb-resource-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 10px;
  background: var(--cb-color-resource-bg);
  border: 1px solid var(--cb-color-border);
  border-radius: var(--cb-radius-sm);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: all var(--cb-transition);
  min-height: var(--cb-touch-min);
}

.cb-resource-card:hover {
  border-color: var(--cb-color-primary);
  background: var(--cb-color-primary-light);
}

.cb-resource-icon { font-size: 22px; }
.cb-resource-title {
  font-weight: 600;
  font-size: var(--cb-font-size-label);
}
.cb-resource-sub {
  font-size: var(--cb-font-size-small);
  color: var(--cb-color-text2);
  text-align: center;
}

/* Footer / Copyright (Intro) */
.cb-footer {
  margin-top: var(--cb-spacing-lg);
  padding-top: var(--cb-spacing);
  border-top: 1px solid var(--cb-color-border);
  text-align: center;
}

.cb-footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 8px;
}

.cb-footer-links a {
  font-size: var(--cb-font-size-small);
  color: var(--cb-color-text2);
  text-decoration: none;
  transition: color var(--cb-transition);
}
.cb-footer-links a:hover { color: var(--cb-color-primary); }

.cb-copyright {
  font-size: 10px;
  color: var(--cb-color-text2);
  opacity: 0.7;
}


/* ── 5. App Shell Components ──────────────── */

.cb-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  background: var(--cb-color-bg);
  color: var(--cb-color-text);
  overflow: hidden;
}

.cb-header {
  display: flex;
  align-items: center;
  gap: var(--cb-spacing);
  padding: 0 var(--cb-spacing);
  height: 56px;
  background: var(--cb-color-surface);
  border-bottom: 1px solid var(--cb-color-border);
  box-shadow: var(--cb-shadow-sm);
  flex-shrink: 0;
  z-index: 10;
}

.cb-header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.cb-header-logo img {
  height: 28px;
  object-fit: contain;
}

.cb-header-logo-text {
  font-family: var(--cb-font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--cb-brand-dark);
}

.cb-header-title {
  flex: 1;
  text-align: center;
  font-family: var(--cb-font-display);
  font-weight: 600;
  font-size: var(--cb-font-size-subtitle);
  color: var(--cb-color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cb-header-actions {
  display: flex;
  align-items: center;
  gap: var(--cb-spacing-sm);
  flex-shrink: 0;
}

.cb-header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  border-radius: var(--cb-radius-sm);
  cursor: pointer;
  font-size: 18px;
  color: var(--cb-color-text2);
  transition: all var(--cb-transition);
}

.cb-header-btn:hover {
  background: var(--cb-color-primary-light);
  color: var(--cb-color-primary);
}

/* ── App Body & Main Content ── */
.cb-body-wrap {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.cb-main {
  flex: 1;
  overflow-y: auto;
  padding: var(--cb-spacing);
}

/* ── 5a. Settings Overlay (v2) ─────────────── */

.cb-settings-overlay {
  position: fixed;
  inset: 0;
  background: var(--cb-overlay-bg);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--cb-transition);
}

.cb-settings-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.cb-settings-panel {
  background: var(--cb-color-surface);
  border-radius: var(--cb-radius-lg);
  box-shadow: var(--cb-shadow-lg);
  padding: var(--cb-spacing-lg);
  width: 90%;
  max-width: 400px;
  max-height: 80vh;
  overflow-y: auto;
  animation: cb-fadeUp 0.3s ease;
}

/* Settings Header (title + close X) */
.cb-settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--cb-spacing);
}

.cb-settings-title {
  font-family: var(--cb-font-display);
  font-weight: 700;
  font-size: var(--cb-font-size-title);
}

.cb-settings-close-x {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: var(--cb-color-bg);
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  color: var(--cb-color-text2);
  transition: all var(--cb-transition);
}

.cb-settings-close-x:hover {
  background: var(--cb-color-primary-light);
  color: var(--cb-color-primary);
}

/* Settings Section Titles */
.cb-settings-section-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--cb-font-size-label);
  font-weight: 600;
  color: var(--cb-color-text2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: var(--cb-spacing) 0 var(--cb-spacing-sm) 0;
  padding-top: var(--cb-spacing-sm);
}
/* Only first section title gets no border-top */
.cb-settings-section-title:first-of-type {
  margin-top: 0;
}
/* Section dividers: single border between sections */
.cb-settings-section-title ~ .cb-settings-section-title {
  border-top: 1px solid var(--cb-color-border);
}

.cb-settings-section-icon {
  font-size: 14px;
}

/* Settings Items */
.cb-settings-item {
  display: flex;
  align-items: center;
  gap: var(--cb-spacing);
  padding: var(--cb-spacing-sm) 0;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: opacity var(--cb-transition);
}

.cb-settings-item:hover { opacity: 0.8; }
.cb-settings-item:last-child { border-bottom: none; }
.cb-settings-item-static { cursor: default; }
.cb-settings-item-static:hover { opacity: 1; }

.cb-settings-icon {
  font-size: 20px;
  width: 32px;
  text-align: center;
  flex-shrink: 0;
}

.cb-settings-label { flex: 1; }

.cb-settings-label-title {
  font-weight: 600;
  font-size: var(--cb-font-size-base);
}

.cb-settings-label-sub {
  font-size: var(--cb-font-size-small);
  color: var(--cb-color-text2);
  display: block;
}

.cb-settings-arrow {
  font-size: 16px;
  color: var(--cb-color-text2);
  flex-shrink: 0;
}

/* Settings Language Grid (v2) */
/* Logo clickable */
.cb-header-logo-clickable { cursor: pointer; }
.cb-header-logo-clickable:hover { opacity: 0.8; }

/* Header btn SVG alignment */
.cb-header-btn svg { display: block; }

.cb-settings-lang-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: var(--cb-spacing-sm);
}

.cb-settings-lang-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1.5px solid var(--cb-color-border);
  border-radius: var(--cb-radius-sm);
  background: var(--cb-color-bg);
  cursor: pointer;
  font-family: var(--cb-font-body);
  font-size: var(--cb-font-size-small);
  font-weight: 500;
  color: var(--cb-color-text);
  transition: all var(--cb-transition);
  min-height: 36px;
}

.cb-settings-lang-btn:hover {
  border-color: var(--cb-color-primary);
  background: var(--cb-color-primary-light);
}
.cb-settings-lang-btn.active {
  border-color: var(--cb-color-primary);
  background: var(--cb-color-primary-light);
}

.cb-settings-lang-code {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 20px; border-radius: 4px; flex-shrink: 0;
  font-size: 10px; font-weight: 700; letter-spacing: 0.5px;
  background: var(--cb-color-border); color: var(--cb-color-text);
}
.cb-settings-lang-btn.active .cb-settings-lang-code {
  background: var(--cb-color-primary); color: #fff;
}

.cb-settings-lang-name { flex: 1; }

.cb-settings-lang-check {
  font-size: 14px;
  font-weight: 700;
  color: var(--cb-color-primary);
  width: 16px;
  text-align: center;
}

/* Settings Close Button */
.cb-settings-close {
  display: block;
  width: 100%;
  margin-top: var(--cb-spacing);
  padding: 12px;
  background: var(--cb-color-bg);
  border: 1px solid var(--cb-color-border);
  border-radius: var(--cb-radius-sm);
  font-family: var(--cb-font-body);
  font-size: var(--cb-font-size-base);
  cursor: pointer;
  color: var(--cb-color-text);
  transition: all var(--cb-transition);
}

.cb-settings-close:hover {
  background: var(--cb-color-primary-light);
  border-color: var(--cb-color-primary);
}


/* ── 5c. App 3-Column Layout ──────────────── */

.cb-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.cb-canvas {
  flex: 1;
  overflow-y: auto;
  padding: var(--cb-spacing);
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.cb-sidebar {
  width: 360px;
  flex-shrink: 0;
  overflow-y: auto;
  padding: var(--cb-spacing);
  border-left: 1px solid var(--cb-color-border);
  background: var(--cb-color-surface);
  display: flex;
  flex-direction: column;
  gap: var(--cb-spacing);
}

.cb-sidebar-card {
  background: var(--cb-color-bg);
  border: 1px solid var(--cb-color-border);
  border-radius: var(--cb-radius-md);
  padding: var(--cb-spacing);
}

.cb-sidebar-card-title {
  font-family: var(--cb-font-display);
  font-weight: 600;
  font-size: var(--cb-font-size-subtitle);
  margin-bottom: var(--cb-spacing-sm);
  display: flex;
  align-items: center;
  gap: 6px;
}

.cb-sidebar-collapse {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
}

.cb-sidebar-collapse.open { max-height: 500px; }

.cb-sidebar-toggle {
  cursor: pointer;
  user-select: none;
}

.cb-sidebar-toggle::after {
  content: '▾';
  margin-left: auto;
  transition: transform var(--cb-transition);
}

.cb-sidebar-toggle.collapsed::after { transform: rotate(-90deg); }


/* ── 5d. Tabs / Step Navigation ────────────── */

.cb-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--cb-spacing-sm);
  padding: var(--cb-spacing-sm) var(--cb-spacing);
  height: 48px;
  background: var(--cb-color-surface);
  border-bottom: 1px solid var(--cb-color-border);
  flex-shrink: 0;
}

.cb-tabs-back {
  position: absolute;
  left: var(--cb-spacing);
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--cb-font-size-small);
  color: var(--cb-color-text2);
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: var(--cb-radius-sm);
  transition: all var(--cb-transition);
}

.cb-tabs-back:hover {
  background: var(--cb-color-primary-light);
  color: var(--cb-color-primary);
}

.cb-tab {
  padding: 6px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--cb-color-border);
  background: transparent;
  font-family: var(--cb-font-body);
  font-size: var(--cb-font-size-small);
  font-weight: 500;
  color: var(--cb-color-text2);
  cursor: pointer;
  transition: all var(--cb-transition);
  white-space: nowrap;
}

.cb-tab:hover {
  border-color: var(--cb-color-primary);
  color: var(--cb-color-primary);
}

.cb-tab.active {
  background: var(--cb-color-primary);
  color: var(--cb-color-on-primary);
  border-color: var(--cb-color-primary);
  font-weight: 600;
}

.cb-tab:disabled, .cb-tab[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}

.cb-tabs-help {
  position: absolute;
  right: var(--cb-spacing);
}


/* ── 5f. Emergency Stop ────────────────────── */

.cb-emergency-stop {
  background: var(--cb-color-error);
  color: #FFFFFF;
  border: none;
  border-radius: var(--cb-radius-sm);
  padding: 6px 14px;
  font-family: var(--cb-font-body);
  font-size: var(--cb-font-size-small);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all var(--cb-transition);
  flex-shrink: 0;
}

.cb-emergency-stop:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 12px rgba(239, 68, 68, 0.4);
}

.cb-emergency-stop:disabled {
  background: var(--cb-color-text2);
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}


/* ── 5g. Status Bar ────────────────────────── */

.cb-status {
  display: flex;
  align-items: center;
  gap: var(--cb-spacing-sm);
  padding: var(--cb-spacing-sm) var(--cb-spacing);
  height: 40px;
  background: var(--cb-color-surface);
  border-top: 1px solid var(--cb-color-border);
  font-size: var(--cb-font-size-small);
  color: var(--cb-color-text2);
  flex-shrink: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.cb-status-icon {
  flex-shrink: 0;
  font-size: 14px;
}


/* ── 5h. Canvas Empty State ────────────────── */

.cb-canvas-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--cb-spacing);
  padding: var(--cb-spacing-lg);
  color: var(--cb-color-text2);
  text-align: center;
}

.cb-canvas-empty-icon {
  font-size: 56px;
  opacity: 0.6;
}

.cb-canvas-empty-title {
  font-family: var(--cb-font-display);
  font-weight: 600;
  font-size: var(--cb-font-size-subtitle);
  color: var(--cb-color-text);
}

.cb-canvas-empty-desc {
  font-size: var(--cb-font-size-small);
}

.cb-canvas-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--cb-spacing);
  background: var(--cb-overlay-bg);
  z-index: 5;
  border-radius: var(--cb-radius-md);
}

.cb-canvas-overlay-text {
  color: #FFFFFF;
  font-weight: 600;
  font-size: var(--cb-font-size-base);
}


/* ── 5i. Toast Notifications ───────────────── */

.cb-toast-container {
  position: fixed;
  top: 70px;
  right: var(--cb-spacing);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: var(--cb-spacing-sm);
}

.cb-toast {
  display: flex;
  align-items: center;
  gap: var(--cb-spacing-sm);
  padding: 10px 16px;
  border-radius: var(--cb-radius-sm);
  background: var(--cb-color-surface);
  border: 1px solid var(--cb-color-border);
  box-shadow: var(--cb-shadow-lg);
  font-size: var(--cb-font-size-small);
  animation: cb-slideIn 0.3s ease, cb-fadeOut 0.3s ease 3s forwards;
  min-width: 200px;
  max-width: 360px;
}

.cb-toast.success { border-left: 3px solid var(--cb-color-success); }
.cb-toast.error   { border-left: 3px solid var(--cb-color-error); }
.cb-toast.warning { border-left: 3px solid var(--cb-color-warning); }
.cb-toast.info    { border-left: 3px solid var(--cb-color-primary); }

@keyframes cb-slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes cb-fadeOut {
  to { opacity: 0; transform: translateX(20px); }
}


/* ── 5j. Common Buttons ────────────────────── */

.cb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: var(--cb-btn-height);
  padding: 0 var(--cb-spacing);
  border-radius: var(--cb-radius-btn);
  font-family: var(--cb-font-body);
  font-size: var(--cb-btn-font);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--cb-transition);
}

.cb-btn-primary {
  background: var(--cb-color-primary);
  color: var(--cb-color-on-primary);
}

.cb-btn-primary:hover { filter: brightness(1.08); }

.cb-btn-secondary {
  background: transparent;
  color: var(--cb-color-text);
  border: 1px solid var(--cb-color-border);
}

.cb-btn-secondary:hover {
  border-color: var(--cb-color-primary);
  color: var(--cb-color-primary);
}

.cb-btn-danger {
  background: var(--cb-color-error);
  color: #FFFFFF;
}

.cb-btn-success {
  background: var(--cb-color-success);
  color: #FFFFFF;
}

.cb-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Execution Log */
.cb-log {
  max-height: 200px;
  overflow-y: auto;
  font-family: var(--cb-font-mono);
  font-size: var(--cb-font-size-small);
  padding: var(--cb-spacing-sm);
  background: var(--cb-color-bg);
  border: 1px solid var(--cb-color-border);
  border-radius: var(--cb-radius-sm);
}

.cb-log-entry {
  padding: 2px 0;
  border-bottom: 1px solid var(--cb-color-border);
}

.cb-log-entry:last-child { border-bottom: none; }


/* ── 6. Age-Group Themes ────────────────────── */

/* --- KINDER (유아~초저, 5세~2학년) --- */
[data-theme="kinder"], .theme-kinder {
  --cb-font-display: 'Jua', 'Gaegu', sans-serif;
  --cb-font-body: 'Jua', 'Noto Sans KR', sans-serif;
  --cb-font-size-base: 22px;
  --cb-font-size-title: 36px;
  --cb-font-size-subtitle: 18px;
  --cb-font-size-label: 16px;
  --cb-font-size-small: 14px;
  --cb-radius-lg: 28px;
  --cb-radius-md: 20px;
  --cb-radius-sm: 16px;
  --cb-radius-btn: 20px;
  --cb-spacing-sm: 10px;
  --cb-spacing: 20px;
  --cb-spacing-lg: 28px;
  --cb-btn-height: 64px;
  --cb-btn-font: 20px;
  --cb-touch-min: 60px;
  --cb-color-bg: #FFF8F0;
  --cb-color-surface: #FFFFFF;
  --cb-color-text: #3D2C2E;
  --cb-color-text2: #7A6A6C;
  --cb-color-border: #FFD8C8;
  --cb-color-primary: #E05050;
  --cb-color-primary-light: #FFF0F0;
  --cb-color-accent: #4ECDC4;
  --cb-color-on-primary: #FFFFFF;
  --cb-color-lang-card-bg: #FFF5F5;
  --cb-color-resource-bg: #FFF0E8;
  --cb-shadow-lg: 0 8px 32px rgba(224,80,80,0.12);
  --cb-intro-max-w: 480px;
  --cb-intro-padding: 36px 24px;
  --cb-lang-card-padding: 20px 24px;
  --cb-flag-size: 48px;
  --cb-brand-logo-h: 52px;
  --cb-intro-bg-deco: radial-gradient(circle at 20% 30%, rgba(255,107,107,0.08) 0%, transparent 50%),
                       radial-gradient(circle at 80% 70%, rgba(78,205,196,0.08) 0%, transparent 50%);
}

[data-theme="kinder"] .cb-intro-card,
.theme-kinder .cb-intro-card { border: 3px solid var(--cb-color-border); }

[data-theme="kinder"] .cb-title,
.theme-kinder .cb-title { letter-spacing: 1px; }

[data-theme="kinder"] .cb-lang-card,
.theme-kinder .cb-lang-card { border-width: 2.5px; border-radius: var(--cb-radius-md); }

[data-theme="kinder"] .cb-section-label,
.theme-kinder .cb-section-label { text-transform: none; font-size: var(--cb-font-size-label); }

/* Kinder: Card subtle accent (no floating emojis) */
[data-theme="kinder"] .cb-intro-card,
.theme-kinder .cb-intro-card {
  position: relative;
}

/* Kinder: Header adjustments */
[data-theme="kinder"] .cb-header,
.theme-kinder .cb-header { height: 64px; }

[data-theme="kinder"] .cb-header-btn,
.theme-kinder .cb-header-btn { width: 44px; height: 44px; font-size: 22px; }


/* --- DEFAULT (초등 3-6학년) ---
   :root already defines all default values. */
[data-theme="default"], .theme-default {
  --cb-color-bg: #F4F6FB;
  --cb-color-surface: #FFFFFF;
  --cb-color-text: #1B2A4A;
  --cb-color-text2: #6B7A94;
  --cb-color-border: #E2E8F0;
  --cb-color-primary: #4A7FE0;
  --cb-color-primary-light: #EBF1FF;
  --cb-color-accent: #FF6B35;
}


/* --- ADVANCED (중학교 이상) --- */
[data-theme="advanced"], .theme-advanced {
  --cb-font-display: 'Outfit', sans-serif;
  --cb-font-body: 'Pretendard', 'Noto Sans KR', sans-serif;
  --cb-font-size-base: 14px;
  --cb-font-size-title: 24px;
  --cb-font-size-subtitle: 13px;
  --cb-font-size-label: 11px;
  --cb-font-size-small: 10px;
  --cb-radius-lg: 14px;
  --cb-radius-md: 10px;
  --cb-radius-sm: 6px;
  --cb-radius-btn: 8px;
  --cb-spacing-sm: 6px;
  --cb-spacing: 14px;
  --cb-spacing-lg: 20px;
  --cb-btn-height: 42px;
  --cb-btn-font: 13px;
  --cb-touch-min: 40px;
  --cb-color-bg: #0F1219;
  --cb-color-surface: #1A1F2E;
  --cb-color-text: #E0E4ED;
  --cb-color-text2: #9BA3B5;
  --cb-color-border: #364058;
  --cb-color-primary: #6C8AFF;
  --cb-color-primary-light: rgba(108,138,255,0.1);
  --cb-color-accent: #FF7B54;
  --cb-color-on-primary: #FFFFFF;
  --cb-color-lang-card-bg: #1F2535;
  --cb-color-resource-bg: #161B28;
  --cb-shadow-lg: 0 8px 32px rgba(0,0,0,0.3);
  --cb-overlay-bg: rgba(0,0,0,0.6);
  --cb-intro-max-w: 540px;
  --cb-intro-padding: 40px 32px;
  --cb-lang-card-padding: 14px 18px;
  --cb-flag-size: 32px;
  --cb-brand-logo-h: 36px;
  --cb-intro-bg-deco: radial-gradient(ellipse at 30% 20%, rgba(108,138,255,0.06) 0%, transparent 50%);
}

[data-theme="advanced"] .cb-intro-card,
.theme-advanced .cb-intro-card { border: 1px solid var(--cb-color-border); }

[data-theme="advanced"] .cb-version,
.theme-advanced .cb-version { background: rgba(108,138,255,0.12); color: #8DA4FF; }

[data-theme="advanced"] .cb-lang-card:hover,
.theme-advanced .cb-lang-card:hover { background: rgba(108,138,255,0.05); }

[data-theme="advanced"] .cb-header-logo-text,
.theme-advanced .cb-header-logo-text { color: var(--cb-color-text); }

/* Advanced: Logo text for dark background */
[data-theme="advanced"] .cb-logo-text,
.theme-advanced .cb-logo-text { color: var(--cb-color-text); }

[data-theme="advanced"] .cb-logo-text .brand,
.theme-advanced .cb-logo-text .brand { color: var(--cb-color-primary); }

/* Advanced: Settings & BLE modals → dark */
[data-theme="advanced"] .cb-settings-panel,
.theme-advanced .cb-settings-panel {
  background: var(--cb-color-surface);
  border: 1px solid var(--cb-color-border);
}

[data-theme="advanced"] .cb-ble-modal,
.theme-advanced .cb-ble-modal {
  background: var(--cb-color-surface);
  border: 1px solid var(--cb-color-border);
}

[data-theme="advanced"] .cb-settings-close-x,
.theme-advanced .cb-settings-close-x {
  background: var(--cb-color-bg);
  color: var(--cb-color-text2);
}

[data-theme="advanced"] .cb-settings-lang-btn,
.theme-advanced .cb-settings-lang-btn {
  background: var(--cb-color-bg);
  border-color: var(--cb-color-border);
  color: var(--cb-color-text);
}

[data-theme="advanced"] .cb-settings-lang-btn:hover,
.theme-advanced .cb-settings-lang-btn:hover {
  background: var(--cb-color-primary-light);
  border-color: var(--cb-color-primary);
}

[data-theme="advanced"] .cb-settings-close,
.theme-advanced .cb-settings-close {
  background: var(--cb-color-bg);
  border-color: var(--cb-color-border);
  color: var(--cb-color-text);
}

[data-theme="advanced"] .cb-ble-modal-close,
.theme-advanced .cb-ble-modal-close {
  background: var(--cb-color-bg);
  color: var(--cb-color-text2);
}


/* ── 7. Responsive ──────────────────────────── */

/* Tablet: Sidebar → 하단 접이식 */
@media (max-width: 1023px) {
  .cb-body {
    flex-direction: column;
  }

  .cb-sidebar {
    width: 100%;
    max-height: 40vh;
    border-left: none;
    border-top: 1px solid var(--cb-color-border);
    flex-shrink: 0;
  }

  .cb-canvas {
    flex: 1;
    min-height: 40vh;
  }

  .cb-tabs {
    position: relative;
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    padding-left: 60px;
  }
}

/* Mobile: 단일 컬럼 */
@media (max-width: 767px) {
  .cb-sidebar {
    max-height: none;
    overflow-y: visible;
  }

  .cb-header {
    gap: var(--cb-spacing-sm);
    padding: 0 var(--cb-spacing-sm);
  }

  .cb-header-title {
    font-size: var(--cb-font-size-label);
  }

  .cb-emergency-stop span {
    display: none;
  }

  .cb-tab {
    padding: 4px 12px;
    font-size: 10px;
  }
}

@media (max-width: 560px) {
  .cb-resource-grid {
    grid-template-columns: 1fr;
  }
  .cb-intro-card {
    padding: 28px 18px !important;
  }
  .cb-header {
    gap: var(--cb-spacing-sm);
    padding: 0 var(--cb-spacing-sm);
  }
  .cb-header-title {
    font-size: var(--cb-font-size-label);
  }
  .cb-settings-lang-grid {
    flex-direction: column;
  }
}

/* ═══════════════════════════════════════════════
   5b. BLE UI — Theme-Responsive (v3)
   Kinder: fullpage | Default/Advanced: slide panel
   ═══════════════════════════════════════════════ */

/* ── Header BLE Pill ── */
.cb-ble-pill {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 14px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
  cursor: pointer; border: 1.5px solid var(--cb-color-border);
  background: var(--cb-color-surface); color: var(--cb-color-text);
  font-family: var(--cb-font-body);
  transition: all var(--cb-transition);
}
.cb-ble-pill:hover { border-color: var(--cb-color-primary); }
[data-theme="kinder"] .cb-ble-pill {
  padding: 8px 18px; font-size: 15px;
  border-width: 2.5px; border-radius: 24px;
}
.cb-ble-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  transition: background 0.3s;
}
[data-theme="kinder"] .cb-ble-dot { width: 10px; height: 10px; }
.cb-ble-dot[data-status="disconnected"] { background: #EF4444; }
.cb-ble-dot[data-status="searching"],
.cb-ble-dot[data-status="reconnecting"] { background: #F59E0B; animation: cb-ble-blink 1s infinite; }
.cb-ble-dot[data-status="connected"] { background: #22C55E; }
@keyframes cb-ble-blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

/* ── Body Wrapper (flex for panel layout) ── */
.cb-body-wrap {
  display: flex; flex: 1; overflow: hidden; position: relative;
}

/* ── Slide Panel (Default + Advanced) ── */
.cb-ble-panel {
  position: absolute; top: 0; right: 0; bottom: 0;
  width: 340px; background: var(--cb-color-surface);
  border-left: 1px solid var(--cb-color-border);
  box-shadow: -4px 0 20px rgba(0,0,0,0.08);
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 20; display: flex; flex-direction: column; overflow: hidden;
}
.cb-ble-panel.open { transform: translateX(0); }
[data-theme="advanced"] .cb-ble-panel { box-shadow: -4px 0 20px rgba(0,0,0,0.3); }

.cb-ble-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--cb-color-border); flex-shrink: 0;
}
.cb-ble-panel-title {
  font-family: var(--cb-font-display); font-weight: 700; font-size: 16px;
}
.cb-ble-panel-close {
  width: 32px; height: 32px; border: none;
  background: var(--cb-color-bg); border-radius: 50%;
  cursor: pointer; font-size: 16px; color: var(--cb-color-text2);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--cb-transition);
}
.cb-ble-panel-close:hover { color: var(--cb-color-primary); }
.cb-ble-panel-body { flex: 1; overflow-y: auto; padding: 16px 20px; }
.cb-ble-panel-footer {
  padding: 12px 20px; border-top: 1px solid var(--cb-color-border); flex-shrink: 0;
}

/* ── Fullpage (Kinder) ── */
.cb-ble-fullpage {
  position: absolute; inset: 0; z-index: 25;
  background: linear-gradient(180deg, #FFE8E8 0%, #FFF0E8 30%, #E8F4FF 100%);
  display: none; flex-direction: column; overflow: hidden;
}
.cb-ble-fullpage.open { display: flex; }
.cb-ble-fullpage-header {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px; flex-shrink: 0;
}
.cb-ble-fullpage-back {
  padding: 10px 20px; border-radius: 20px; font-size: 16px; font-weight: 700;
  cursor: pointer; border: 2.5px solid var(--cb-color-primary);
  background: var(--cb-color-primary); color: #fff;
  font-family: var(--cb-font-display); transition: all var(--cb-transition);
}
.cb-ble-fullpage-back:hover { opacity: 0.9; transform: scale(0.98); }
.cb-ble-fullpage-title {
  flex: 1; text-align: center;
  font-family: var(--cb-font-display); font-weight: 700; font-size: 22px;
}
.cb-ble-fullpage-body { flex: 1; overflow-y: auto; padding: 0 20px 20px; }

/* ── Kinder Block Grid ── */
.cb-ble-kinder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px; padding: 8px 0;
}
.cb-ble-kinder-card {
  display: flex; flex-direction: column; align-items: center;
  padding: 20px 16px; background: var(--cb-color-surface);
  border: 2.5px solid var(--cb-color-border); border-radius: 20px;
  transition: all var(--cb-transition); text-align: center;
}
.cb-ble-kinder-card.connected { border-color: #22C55E; background: #f0fdf4; }
.cb-ble-kinder-card.searching { border-color: #F59E0B; background: #fffbeb; }
.cb-ble-kinder-icon {
  width: 80px; height: 80px; border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 44px; margin-bottom: 12px;
}
.cb-ble-kinder-icon img { width: 72px; height: 72px; object-fit: contain; border-radius: 16px; }
.cb-ble-kinder-name {
  font-family: var(--cb-font-display); font-weight: 700; font-size: 17px; margin-bottom: 4px;
}
.cb-ble-kinder-btn {
  width: 100%; padding: 12px; border-radius: 14px; font-size: 16px; font-weight: 700;
  cursor: pointer; border: 2.5px solid var(--cb-color-primary);
  background: var(--cb-color-primary); color: #fff;
  font-family: var(--cb-font-display); margin-top: 8px;
  transition: all var(--cb-transition);
}
.cb-ble-kinder-btn:hover { transform: scale(0.98); }
.cb-ble-kinder-btn.connected { background: #22C55E; border-color: #22C55E; }

/* ── Panel Block Cards (Default / Advanced) ── */
.cb-ble-card {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; background: var(--cb-color-surface);
  border: 1.5px solid var(--cb-color-border); border-radius: var(--cb-radius);
  margin-bottom: 8px; transition: all var(--cb-transition);
}
.cb-ble-card.connected { border-color: #22C55E; }
.cb-ble-card.searching { border-color: #F59E0B; }
[data-theme="default"] .cb-ble-card.connected { background: #f0fdf4; }
[data-theme="default"] .cb-ble-card.searching { background: #fffbeb; }
[data-theme="advanced"] .cb-ble-card.connected { background: rgba(34,197,94,0.08); }
[data-theme="advanced"] .cb-ble-card.searching { background: rgba(245,158,11,0.08); }

.cb-ble-card-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; flex-shrink: 0;
}
.cb-ble-card-icon img { width: 36px; height: 36px; object-fit: contain; border-radius: 8px; }
.cb-ble-card-info { flex: 1; min-width: 0; }
.cb-ble-card-name { font-weight: 600; font-size: 13px; }
.cb-ble-card-sub { font-size: 10px; color: var(--cb-color-text2); margin-top: 1px; }
.cb-ble-card-status {
  font-size: 9px; font-weight: 600; padding: 2px 8px;
  border-radius: 10px; margin-top: 3px; display: inline-block;
}
.cb-ble-card-status.disconnected { background: #fee2e2; color: #dc2626; }
.cb-ble-card-status.searching,
.cb-ble-card-status.reconnecting { background: #fef3c7; color: #d97706; }
.cb-ble-card-status.connected { background: #dcfce7; color: #16a34a; }
[data-theme="advanced"] .cb-ble-card-status.disconnected { background: rgba(239,68,68,0.15); }
[data-theme="advanced"] .cb-ble-card-status.searching,
[data-theme="advanced"] .cb-ble-card-status.reconnecting { background: rgba(245,158,11,0.15); }
[data-theme="advanced"] .cb-ble-card-status.connected { background: rgba(34,197,94,0.15); }

.cb-ble-card-btn {
  padding: 5px 12px; border-radius: var(--cb-radius-sm); font-size: 11px; font-weight: 600;
  cursor: pointer; border: 1.5px solid var(--cb-color-primary); background: transparent;
  color: var(--cb-color-primary); font-family: var(--cb-font-body);
  transition: all var(--cb-transition); flex-shrink: 0;
}
.cb-ble-card-btn:hover { background: var(--cb-color-primary); color: #fff; }
.cb-ble-card-btn.connected { border-color: #22C55E; color: #22C55E; }

/* ── Group Number Row ── */
.cb-ble-grp-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; background: var(--cb-color-bg);
  border: 1px solid var(--cb-color-border); border-radius: var(--cb-radius);
  margin-bottom: 12px;
}
[data-theme="kinder"] .cb-ble-grp-row {
  padding: 14px 20px; border-width: 2.5px; border-radius: 16px;
}
.cb-ble-grp-label { font-size: 13px; font-weight: 600; white-space: nowrap; }
[data-theme="kinder"] .cb-ble-grp-label { font-size: 16px; }
.cb-ble-grp-input {
  width: 72px; padding: 5px 8px; border: 1.5px solid var(--cb-color-border);
  border-radius: var(--cb-radius-sm); font-family: monospace;
  font-size: 14px; text-align: center; font-weight: 600;
  background: var(--cb-color-surface); color: var(--cb-color-text);
}
[data-theme="kinder"] .cb-ble-grp-input {
  width: 90px; padding: 8px 12px; font-size: 18px; border-width: 2.5px;
}
.cb-ble-grp-input:focus { outline: none; border-color: var(--cb-color-primary); }
.cb-ble-grp-hint { font-size: 10px; color: var(--cb-color-text2); }
[data-theme="kinder"] .cb-ble-grp-hint { font-size: 12px; }

/* ── Summary Chips ── */
.cb-ble-summary { display: flex; gap: 4px; margin-bottom: 10px; flex-wrap: wrap; }
.cb-ble-chip {
  display: flex; align-items: center; gap: 3px;
  padding: 3px 8px; border-radius: 10px; font-size: 10px; font-weight: 600;
  background: #fee2e2; color: #dc2626;
}
.cb-ble-chip.ok { background: #dcfce7; color: #16a34a; }
[data-theme="advanced"] .cb-ble-chip { background: rgba(239,68,68,0.15); color: #f87171; }
[data-theme="advanced"] .cb-ble-chip.ok { background: rgba(34,197,94,0.15); color: #4ade80; }

/* ── Disconnect All Button ── */
.cb-ble-disconnect-all {
  width: 100%; padding: 10px; border-radius: var(--cb-radius);
  font-size: 13px; font-weight: 600; cursor: pointer;
  border: 1.5px solid var(--cb-color-border); background: transparent;
  color: var(--cb-color-text2); font-family: var(--cb-font-body);
  transition: all var(--cb-transition);
}
.cb-ble-disconnect-all:hover { border-color: #EF4444; color: #EF4444; }


/* ══════════════════════════════════════════
 *  Onboarding Overlay
 * ══════════════════════════════════════════ */
.cb-onboard-overlay {
  position: fixed; inset: 0; z-index: 10000;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.cb-onboard-overlay.open { opacity: 1; pointer-events: auto; }

.cb-onboard-card {
  width: 90%; max-width: 380px;
  background: var(--cb-color-surface, #fff);
  border-radius: var(--cb-radius-lg, 16px);
  padding: 40px 32px 28px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  animation: cb-fadeUp 0.4s ease;
}

.cb-onboard-icon {
  display: flex; align-items: center; justify-content: center;
  width: 80px; height: 80px; margin: 0 auto 20px;
  border-radius: 50%;
  background: var(--cb-color-primary-light, #e8ecff);
  color: var(--cb-color-primary, #4A7FE0);
}

.cb-onboard-title {
  font-family: var(--cb-font-display, sans-serif);
  font-size: 20px; font-weight: 700;
  color: var(--cb-color-text, #222);
  margin-bottom: 8px;
}

.cb-onboard-desc {
  font-size: 14px; line-height: 1.6;
  color: var(--cb-color-text2, #777);
  margin-bottom: 24px;
}

.cb-onboard-dots {
  display: flex; justify-content: center; gap: 8px; margin-bottom: 24px;
}

.cb-onboard-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--cb-color-border, #ddd);
  transition: all 0.3s;
}
.cb-onboard-dot.active {
  width: 24px; border-radius: 4px;
  background: var(--cb-color-primary, #4A7FE0);
}

.cb-onboard-actions {
  display: flex; justify-content: space-between; align-items: center;
}

.cb-onboard-skip {
  background: none; border: none; cursor: pointer;
  font-family: var(--cb-font-body, sans-serif);
  font-size: 13px; color: var(--cb-color-text2, #999);
  padding: 8px 4px;
}
.cb-onboard-skip:hover { color: var(--cb-color-text, #333); }

.cb-onboard-next {
  background: var(--cb-color-primary, #4A7FE0);
  color: #fff; border: none; border-radius: var(--cb-radius-sm, 8px);
  padding: 10px 28px; cursor: pointer;
  font-family: var(--cb-font-display, sans-serif);
  font-size: 14px; font-weight: 600;
  transition: all 0.2s;
}
.cb-onboard-next:hover { filter: brightness(1.1); transform: translateY(-1px); }

/* Kinder onboarding */
[data-theme="kinder"] .cb-onboard-card { border-radius: 24px; padding: 48px 36px 32px; }
[data-theme="kinder"] .cb-onboard-icon { width: 96px; height: 96px; }
[data-theme="kinder"] .cb-onboard-title { font-size: 22px; }
[data-theme="kinder"] .cb-onboard-next { padding: 14px 36px; font-size: 16px; border-radius: 12px; }

/* Advanced onboarding */
[data-theme="advanced"] .cb-onboard-card { background: var(--cb-color-surface); border: 1px solid var(--cb-color-border); }

/* ══════════════════════════════════════════
 *  Kinder Intro — Simple lang buttons (name only)
 * ══════════════════════════════════════════ */
.cb-lang-compact--simple {
  justify-content: center;
  padding: 14px 12px;
  min-height: 52px;
}
.cb-lang-compact--simple .cb-lang-compact-name {
  font-size: 17px;
  font-weight: 700;
  text-align: center;
}

/* ══════════════════════════════════════════
 *  Font Scale System (Accessibility/UDL)
 * ══════════════════════════════════════════ */
.cb-app {
  --cb-font-scale: 1;
}
.cb-header-title {
  font-size: calc(var(--cb-font-size-title) * var(--cb-font-scale, 1));
}
.cb-main {
  font-size: calc(var(--cb-font-size-body) * var(--cb-font-scale, 1));
}
.cb-ble-card-name, .cb-ble-kinder-name {
  font-size: calc(14px * var(--cb-font-scale, 1));
}
.cb-ble-card-sub {
  font-size: calc(11px * var(--cb-font-scale, 1));
}

/* ══════════════════════════════════════════
 *  High Contrast Mode (Accessibility/UDL)
 * ══════════════════════════════════════════ */
.cb-app[data-contrast="high"] {
  --cb-color-text: #000;
  --cb-color-text2: #333;
  --cb-color-bg: #fff;
  --cb-color-surface: #fff;
  --cb-color-border: #000;
  --cb-color-primary: #0000cc;
  --cb-color-primary-light: #e0e0ff;
}
.cb-app[data-contrast="high"] .cb-header {
  border-bottom: 2px solid #000;
}
.cb-app[data-contrast="high"] .cb-ble-card,
.cb-app[data-contrast="high"] .cb-ble-kinder-card {
  border: 2px solid #000;
}
.cb-app[data-contrast="high"] .cb-ble-pill {
  border: 2px solid #000;
}
/* High contrast: code badges need visible bg, not black-on-black */
.cb-app[data-contrast="high"] .cb-settings-lang-code,
.cb-app[data-contrast="high"] .cb-lang-compact-code {
  background: #ddd; color: #000;
}
.cb-app[data-contrast="high"] .cb-settings-lang-btn.active .cb-settings-lang-code {
  background: #0000cc; color: #fff;
}
/* High contrast: consistent borders */
.cb-app[data-contrast="high"] .cb-settings-section-title,
.cb-app[data-contrast="high"] .cb-settings-version {
  border-top: 2px solid #000;
}

/* Advanced theme high contrast overrides */
.cb-app[data-theme="advanced"][data-contrast="high"] {
  --cb-color-bg: #000;
  --cb-color-surface: #111;
  --cb-color-text: #fff;
  --cb-color-text2: #ccc;
  --cb-color-border: #888;
  --cb-color-primary: #6C8AFF;
}
.cb-app[data-theme="advanced"][data-contrast="high"] .cb-settings-lang-code,
.cb-app[data-theme="advanced"][data-contrast="high"] .cb-lang-compact-code {
  background: #444; color: #fff;
}

/* ══════════════════════════════════════════
 *  Settings — Accessibility Controls
 * ══════════════════════════════════════════ */
.cb-settings-a11y-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  gap: 12px;
}

.cb-settings-a11y-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--cb-color-text, #333);
  flex-shrink: 0;
}

/* Font size 3-step buttons */
.cb-settings-fontsize {
  display: flex; gap: 4px;
}
.cb-fontsize-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 12px;
  border: 1.5px solid var(--cb-color-border, #ddd);
  border-radius: 8px;
  background: var(--cb-color-surface, #fff);
  color: var(--cb-color-text2, #777);
  font-family: var(--cb-font-body, sans-serif);
  font-size: 11px; font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.cb-fontsize-btn:hover {
  border-color: var(--cb-color-primary, #4A7FE0);
  color: var(--cb-color-primary, #4A7FE0);
}
.cb-fontsize-btn.active {
  background: var(--cb-color-primary, #4A7FE0);
  border-color: var(--cb-color-primary, #4A7FE0);
  color: #fff;
}

/* Toggle switch */
.cb-settings-toggle {
  position: relative;
  display: inline-block;
  width: 44px; height: 24px;
  flex-shrink: 0;
}
.cb-settings-toggle input {
  opacity: 0; width: 0; height: 0;
}
.cb-settings-toggle-slider {
  position: absolute; inset: 0;
  background: #ccc;
  border-radius: 24px;
  cursor: pointer;
  transition: background 0.3s;
}
.cb-settings-toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  left: 3px; bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.3s;
}
.cb-settings-toggle input:checked + .cb-settings-toggle-slider {
  background: var(--cb-color-primary, #4A7FE0);
}
.cb-settings-toggle input:checked + .cb-settings-toggle-slider::before {
  transform: translateX(20px);
}

/* Settings version footer */
.cb-settings-version {
  text-align: center;
  font-size: 11px;
  color: var(--cb-color-text2, #999);
  padding: var(--cb-spacing) 0 4px;
  border-top: 1px solid var(--cb-color-border);
  margin-top: var(--cb-spacing);
}