/* ═══════════════════════════════════════════════
   THE LANGUAGES — Design Tokens & Component Styles
   Modern & Vibrant Language Learning Platform
   ═══════════════════════════════════════════════ */

/* --- TYPE SCALE --- */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* SPACING (4px base) */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* RADIUS */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.75rem;
  --radius-full: 9999px;

  /* TRANSITIONS */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 350ms cubic-bezier(0.16, 1, 0.3, 1);

  /* FONTS */
  --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;
  --font-body: 'Nunito', 'Inter', sans-serif;

  /* CONTENT WIDTHS */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* ═══════════ LIGHT MODE (Default) ═══════════ */
:root, [data-theme="light"] {
  /* Surfaces — Clean white with subtle warmth */
  --color-bg:             #FAFBFF;
  --color-surface:        #FFFFFF;
  --color-surface-2:      #F5F7FC;
  --color-surface-offset: #EEF1F9;
  --color-divider:        #E2E6F0;
  --color-border:         #D0D5E3;

  /* Text */
  --color-text:           #1A1D2E;
  --color-text-muted:     #6B7088;
  --color-text-faint:     #A0A4B8;
  --color-text-inverse:   #FFFFFF;

  /* Primary — Rich Indigo-Blue */
  --color-primary:        #5B4CF0;
  --color-primary-hover:  #4A3CD9;
  --color-primary-active: #3D2FC2;
  --color-primary-soft:   #EDEAFD;

  /* Secondary — Coral/Warm Orange */
  --color-secondary:      #FF6B6B;
  --color-secondary-hover:#E85555;

  /* Accent — Amber/Gold */
  --color-accent:         #F59E0B;
  --color-accent-hover:   #D97706;

  /* Teal — For success/progress */
  --color-teal:           #14B8A6;
  --color-teal-soft:      #E0F7F4;

  /* Purple — For levels/badges */
  --color-purple:         #8B5CF6;
  --color-purple-soft:    #F0EBFE;

  /* Rose — For highlights */
  --color-rose:           #F43F5E;
  --color-rose-soft:      #FFF1F3;

  /* Semantic */
  --color-success:        #22C55E;
  --color-error:          #EF4444;
  --color-warning:        #F59E0B;

  /* Language-specific accent colors */
  --color-lang-spanish:   #E63946;
  --color-lang-french:    #457B9D;
  --color-lang-japanese:  #E76F51;
  --color-lang-mandarin:  #E9C46A;
  --color-lang-arabic:    #2A9D8F;
  --color-lang-german:    #D4A843;
  --color-lang-portuguese: #009739;
  --color-lang-italian:   #C8553D;
  --color-lang-dutch:     #FF6F00;
  --color-lang-russian:   #5C6BC0;
  --color-lang-korean:    #3F51B5;
  --color-lang-polish:    #DC143C;
  --color-lang-turkish:   #E30A17;
  --color-lang-swedish:   #006AA7;
  --color-lang-czech:     #D7141A;
  --color-lang-danish:    #C8102E;
  --color-lang-norwegian: #BA0C2F;
  --color-lang-finnish:   #003580;
  --color-lang-romanian:  #002B7F;
  --color-lang-ukrainian: #0057B7;
  --color-lang-greek:     #0D5EAF;
  --color-lang-hungarian: #477050;
  --color-lang-vietnamese:#DA251D;
  --color-lang-thai:      #FF6F61;
  --color-lang-hindi:     #FF9933;
  --color-lang-hebrew:    #0038B8;
  --color-lang-indonesian:#FF0000;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(27, 30, 56, 0.06), 0 1px 2px rgba(27, 30, 56, 0.04);
  --shadow-md: 0 4px 12px rgba(27, 30, 56, 0.08);
  --shadow-lg: 0 12px 32px rgba(27, 30, 56, 0.12);
  --shadow-xl: 0 20px 48px rgba(27, 30, 56, 0.16);
  --shadow-glow: 0 0 24px rgba(91, 76, 240, 0.2);
}

/* ═══════════ DARK MODE ═══════════ */
[data-theme="dark"] {
  --color-bg:             #0F1019;
  --color-surface:        #171825;
  --color-surface-2:      #1E2030;
  --color-surface-offset: #252840;
  --color-divider:        #2D3050;
  --color-border:         #3A3E60;

  --color-text:           #E8E9F0;
  --color-text-muted:     #9497B0;
  --color-text-faint:     #5D6080;
  --color-text-inverse:   #0F1019;

  --color-primary:        #8478F6;
  --color-primary-hover:  #9B92F8;
  --color-primary-active: #6B5EE8;
  --color-primary-soft:   #1E1A3D;

  --color-secondary:      #FF8585;
  --color-secondary-hover:#FF6B6B;

  --color-accent:         #FBBF24;
  --color-accent-hover:   #F59E0B;

  --color-teal:           #2DD4BF;
  --color-teal-soft:      #0D2D2A;

  --color-purple:         #A78BFA;
  --color-purple-soft:    #1E1A3D;

  --color-rose:           #FB7185;
  --color-rose-soft:      #2D1520;

  --color-success:        #4ADE80;
  --color-error:          #F87171;
  --color-warning:        #FBBF24;

  --color-lang-spanish:   #FF6B6B;
  --color-lang-french:    #60A5FA;
  --color-lang-japanese:  #FB923C;
  --color-lang-mandarin:  #FBBF24;
  --color-lang-arabic:    #2DD4BF;
  --color-lang-german:    #F0C75E;
  --color-lang-portuguese: #34D399;
  --color-lang-italian:   #F87171;
  --color-lang-dutch:     #FB923C;
  --color-lang-russian:   #818CF8;
  --color-lang-korean:    #818CF8;
  --color-lang-polish:    #FB7185;
  --color-lang-turkish:   #F87171;
  --color-lang-swedish:   #38BDF8;
  --color-lang-czech:     #FB7185;
  --color-lang-danish:    #F87171;
  --color-lang-norwegian: #F87171;
  --color-lang-finnish:   #60A5FA;
  --color-lang-romanian:  #6366F1;
  --color-lang-ukrainian: #38BDF8;
  --color-lang-greek:     #60A5FA;
  --color-lang-hungarian: #4ADE80;
  --color-lang-vietnamese:#F87171;
  --color-lang-thai:      #FB923C;
  --color-lang-hindi:     #FBBF24;
  --color-lang-hebrew:    #60A5FA;
  --color-lang-indonesian:#F87171;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 24px rgba(132, 120, 246, 0.3);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0F1019;
    --color-surface:        #171825;
    --color-surface-2:      #1E2030;
    --color-surface-offset: #252840;
    --color-divider:        #2D3050;
    --color-border:         #3A3E60;
    --color-text:           #E8E9F0;
    --color-text-muted:     #9497B0;
    --color-text-faint:     #5D6080;
    --color-text-inverse:   #0F1019;
    --color-primary:        #8478F6;
    --color-primary-hover:  #9B92F8;
    --color-primary-active: #6B5EE8;
    --color-primary-soft:   #1E1A3D;
    --color-secondary:      #FF8585;
    --color-secondary-hover:#FF6B6B;
    --color-accent:         #FBBF24;
    --color-accent-hover:   #F59E0B;
    --color-teal:           #2DD4BF;
    --color-teal-soft:      #0D2D2A;
    --color-purple:         #A78BFA;
    --color-purple-soft:    #1E1A3D;
    --color-rose:           #FB7185;
    --color-rose-soft:      #2D1520;
    --color-success:        #4ADE80;
    --color-error:          #F87171;
    --color-warning:        #FBBF24;
    --color-lang-spanish:   #FF6B6B;
    --color-lang-french:    #60A5FA;
    --color-lang-japanese:  #FB923C;
    --color-lang-mandarin:  #FBBF24;
    --color-lang-arabic:    #2DD4BF;
    --color-lang-german:    #F0C75E;
    --color-lang-portuguese: #34D399;
    --color-lang-italian:   #F87171;
    --color-lang-dutch:     #FB923C;
    --color-lang-russian:   #818CF8;
    --color-lang-korean:    #818CF8;
    --color-lang-polish:    #FB7185;
    --color-lang-turkish:   #F87171;
    --color-lang-swedish:   #38BDF8;
    --color-lang-czech:     #FB7185;
    --color-lang-danish:    #F87171;
    --color-lang-norwegian: #F87171;
    --color-lang-finnish:   #60A5FA;
    --color-lang-romanian:  #6366F1;
    --color-lang-ukrainian: #38BDF8;
    --color-lang-greek:     #60A5FA;
    --color-lang-hungarian: #4ADE80;
    --color-lang-vietnamese:#F87171;
    --color-lang-thai:      #FB923C;
    --color-lang-hindi:     #FBBF24;
    --color-lang-hebrew:    #60A5FA;
    --color-lang-indonesian:#F87171;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 24px rgba(132, 120, 246, 0.3);
  }
}

/* ═══════════ LAYOUT ═══════════ */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--narrow { max-width: var(--content-narrow); }
.container--default { max-width: var(--content-default); }

/* ═══════════ HEADER / NAV ═══════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-3) 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Conversation Pulse — alternating bubble scale (6s cycle) */
.logo-bubble-back {
  animation: logoPulseA 6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}
.logo-bubble-front {
  animation: logoPulseB 6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}
@keyframes logoPulseA {
  0%, 45%, 100% { transform: scale(1); }
  15% { transform: scale(1.08); }
}
@keyframes logoPulseB {
  0%, 50%, 100% { transform: scale(1); }
  70% { transform: scale(1.08); }
}
@media (prefers-reduced-motion: reduce) {
  .logo-bubble-back, .logo-bubble-front { animation: none; }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.nav-links a, .nav-links button {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.nav-links a:hover, .nav-links button:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.theme-toggle {
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}

.theme-toggle:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.mobile-menu-btn {
  display: none;
  width: 2.25rem;
  height: 2.25rem;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text);
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-1);
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
  .nav-links a, .nav-links button {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    text-align: left;
  }
}

/* ═══════════ HERO SECTION ═══════════ */
.hero {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0 clamp(var(--space-12), 6vw, var(--space-24));
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 60% 50% at 20% 50%, color-mix(in srgb, var(--color-primary) 8%, transparent), transparent),
    radial-gradient(ellipse 50% 60% at 80% 30%, color-mix(in srgb, var(--color-purple) 6%, transparent), transparent),
    radial-gradient(ellipse 40% 40% at 60% 80%, color-mix(in srgb, var(--color-secondary) 5%, transparent), transparent);
  pointer-events: none;
}

.hero-content { position: relative; z-index: 1; }

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--color-text), var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto var(--space-8);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ═══════════ BUTTONS ═══════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  text-decoration: none;
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 2px 8px rgba(91, 76, 240, 0.3);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(91, 76, 240, 0.4);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  padding: var(--space-2) var(--space-4);
}

.btn--ghost:hover { background: var(--color-primary-soft); }

.btn--sm {
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
}

.btn--lg {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-xl);
}

.btn--icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

/* ═══════════ LANGUAGE FLAGS STRIP ═══════════ */
.lang-flags {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-10);
  flex-wrap: wrap;
}

.lang-flag {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  font-size: 2.5rem;
  cursor: pointer;
  transition: transform var(--transition-interactive);
}

.lang-flag span {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
}

.lang-flag:hover { transform: scale(1.15) translateY(-4px); }

/* ═══════════ SECTION STYLING ═══════════ */
.section {
  padding: clamp(var(--space-12), 6vw, var(--space-24)) 0;
}

.section-header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.section-header p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

/* ═══════════ LANGUAGE CARDS ═══════════ */
.lang-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-6);
}

.lang-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  cursor: pointer;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.lang-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--card-accent, var(--color-primary));
  opacity: 0;
  transition: opacity var(--transition-interactive);
}

.lang-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--card-accent, var(--color-primary));
}

.lang-card:hover::before { opacity: 1; }

.lang-card__flag {
  font-size: 3rem;
  margin-bottom: var(--space-3);
}

.lang-card__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.lang-card__native {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.lang-card__meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ═══════════ FEATURES SECTION ═══════════ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

/* Removed hover lift — feature cards are informational, not clickable */

.feature-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: var(--space-4);
}

.feature-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.feature-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ═══════════ LANGUAGE DETAIL VIEW ═══════════ */
.view { display: none; }
.view.active { display: block; }

.lang-header {
  padding: var(--space-8) 0 var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  margin-bottom: var(--space-8);
}

.lang-header__top {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-3);
}

.lang-header__flag { font-size: 2.5rem; }

.lang-header__info h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
}

.lang-header__info span {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.lang-header__tabs {
  display: flex;
  gap: var(--space-1);
  margin-top: var(--space-4);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--space-2);
}

.tab-btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  white-space: nowrap;
  cursor: pointer;
  border: 1.5px solid transparent;
}

.tab-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.tab-btn.active {
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
}

/* ═══════════ LEVEL / UNIT TREE ═══════════ */
.levels-view { }

.level-block {
  margin-bottom: var(--space-8);
}

.level-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  cursor: default;
}

.level-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-sm);
  color: white;
  flex-shrink: 0;
}

.level-badge--a1 { background: linear-gradient(135deg, var(--color-teal), #0d9488); }
.level-badge--a2 { background: linear-gradient(135deg, var(--color-primary), #4338ca); }
.level-badge--b1 { background: linear-gradient(135deg, var(--color-accent), #d97706); }
.level-badge--b2 { background: linear-gradient(135deg, var(--color-rose), #be123c); }

.level-info h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}

.level-info span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.units-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-4);
  padding-left: var(--space-4);
}

.unit-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.unit-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.unit-card__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.unit-card__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.unit-card__lessons {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ═══════════ LESSON LIST VIEW ═══════════ */
.lesson-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-interactive);
}

.lesson-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.lesson-item__number {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.lesson-item__title {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.lesson-item__arrow {
  margin-left: auto;
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}

/* ═══════════ LESSON PLAYER ═══════════ */
.lesson-player {
  max-width: 800px;
  margin: 0 auto;
}

.lesson-player__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.lesson-player__breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
}

.lesson-player__breadcrumb a:hover { text-decoration: underline; }

.lesson-player__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  margin-bottom: var(--space-8);
  color: var(--color-text);
}

/* Explanation card */
.explanation-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.explanation-card p { margin-bottom: var(--space-4); }
.explanation-card p:last-child { margin-bottom: 0; }
.explanation-card strong { color: var(--color-primary); font-weight: 700; }
.explanation-card em { color: var(--color-text-muted); }

/* Examples */
.examples-section {
  margin-bottom: var(--space-8);
}

.examples-section h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

.example-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-2);
  transition: background var(--transition-interactive);
}

.example-row:hover { background: var(--color-surface-2); }

.example-row__native {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  min-width: 80px;
}

.example-row__romanization {
  font-size: var(--text-sm);
  color: var(--color-purple);
  font-style: italic;
  min-width: 80px;
}

.example-row__translation {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  flex: 1;
}

.example-row__audio {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  cursor: pointer;
  font-size: 0.8rem;
  transition: background 0.2s ease, color 0.2s ease;
}

@media (hover: hover) {
  .example-row__audio:hover:not(.speaking):not(.speak-done) {
    background: var(--color-primary);
    color: white;
  }
}

.example-row__audio:active {
  background: var(--color-primary);
  color: white;
}

.example-row__audio.speaking {
  background: var(--color-primary);
  color: white;
  animation: speakPulse 1.2s ease-in-out infinite;
}

/* Transliteration toggle */
.transliteration-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.transliteration-toggle label { cursor: pointer; }

.toggle-switch {
  width: 2.5rem;
  height: 1.375rem;
  border-radius: var(--radius-full);
  background: var(--color-divider);
  position: relative;
  cursor: pointer;
  transition: background var(--transition-interactive);
}

.toggle-switch.active { background: var(--color-primary); }

.toggle-switch::after {
  content: '';
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: white;
  position: absolute;
  top: 3px;
  left: 3px;
  transition: transform var(--transition-interactive);
}

.toggle-switch.active::after { transform: translateX(1.125rem); }

/* ═══════════ EXERCISES ═══════════ */
.exercises-section {
  margin-bottom: var(--space-8);
}

.exercises-section h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

.exercise-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
}

.exercise-card__question {
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.exercise-card__type {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}

/* Multiple choice */
.mc-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mc-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-size: var(--text-sm);
  transition: all var(--transition-interactive);
}

.mc-option:hover:not(.mc-option--answered) {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.mc-option__marker {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: transparent;
  transition: all var(--transition-interactive);
}

.mc-option--correct {
  border-color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 8%, transparent);
}

.mc-option--correct .mc-option__marker {
  border-color: var(--color-success);
  background: var(--color-success);
  color: white;
}

.mc-option--wrong {
  border-color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 8%, transparent);
}

.mc-option--wrong .mc-option__marker {
  border-color: var(--color-error);
  background: var(--color-error);
  color: white;
}

/* Matching exercise */
.matching-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.matching-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.matching-item {
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-lg);
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-interactive);
  user-select: none;
}

.matching-item:hover:not(.matched) {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.matching-item.selected {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: white;
}

.matching-item.matched {
  border-color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
  opacity: 0.8;
  cursor: default;
}

/* Fill blank */
.fill-blank-input {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.fill-blank-input input {
  flex: 1;
  min-width: 160px;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  font-size: var(--text-sm);
}

.fill-blank-input input:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

/* Arrange words */
.arrange-words__bank {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  min-height: 3rem;
  padding: var(--space-3);
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
}

.arrange-words__answer {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  min-height: 3rem;
  padding: var(--space-3);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-lg);
  background: var(--color-primary-soft);
}

.word-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-interactive);
}

.word-chip:hover {
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

/* Exercise feedback */
.exercise-feedback {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  display: none;
}

.exercise-feedback.show { display: block; }

.exercise-feedback--correct {
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
  color: var(--color-success);
  border: 1px solid color-mix(in srgb, var(--color-success) 30%, transparent);
}

.exercise-feedback--wrong {
  background: color-mix(in srgb, var(--color-error) 10%, transparent);
  color: var(--color-error);
  border: 1px solid color-mix(in srgb, var(--color-error) 30%, transparent);
}

/* ═══════════ FLASHCARD SYSTEM ═══════════ */
.flashcard-view { }

.fc-categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.fc-cat-btn {
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-interactive);
  text-transform: capitalize;
}

.fc-cat-btn:hover { border-color: var(--color-primary); background: var(--color-primary-soft); }
.fc-cat-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Flashcard deck area */
.fc-deck {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.fc-counter {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 600;
}

.fc-card-container {
  perspective: 1000px;
  width: 100%;
  max-width: 400px;
  height: 280px;
}

.fc-card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
  cursor: pointer;
}

.fc-card.flipped { transform: rotateY(180deg); }

.fc-card__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-2xl);
  border: 2px solid var(--color-divider);
  padding: var(--space-8);
  background: var(--color-surface);
  gap: var(--space-3);
}

.fc-card__front {
  background: linear-gradient(135deg, var(--color-surface), var(--color-surface-2));
}

.fc-card__back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--color-primary-soft), var(--color-surface));
}

.fc-card__word {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  text-align: center;
}

.fc-card__romanization {
  font-size: var(--text-sm);
  color: var(--color-purple);
  font-style: italic;
}

.fc-card__translation {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
}

.fc-card__hint {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.fc-audio-btn {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(91, 76, 240, 0.3);
  transition: all var(--transition-interactive);
}

@media (hover: hover) {
  .fc-audio-btn:hover:not(.speaking):not(.speak-done) {
    transform: scale(1.1);
    box-shadow: 0 4px 16px rgba(91, 76, 240, 0.4);
  }
}

.fc-audio-btn.speaking {
  animation: speakPulse 1.2s ease-in-out infinite;
  box-shadow: 0 0 16px rgba(91, 76, 240, 0.5);
}

/* Speaking state for generic buttons (story Listen, spelling bee Play Sound) */
.btn.speaking {
  background: var(--color-primary) !important;
  color: white !important;
  border-color: var(--color-primary) !important;
  animation: speakPulse 1.2s ease-in-out infinite;
  box-shadow: 0 0 12px rgba(91, 76, 240, 0.4);
}

@keyframes speakPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

@media (prefers-reduced-motion: reduce) {
  .speaking { animation: none !important; }
}

.fc-controls {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.fc-nav-btn {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
}

.fc-nav-btn:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.fc-nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ═══════════ CULTURAL NOTES ═══════════ */
.cultural-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.cultural-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}

.cultural-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cultural-card__region {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-teal);
  margin-bottom: var(--space-2);
}

.cultural-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.cultural-card__content {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ═══════════ SENTENCE BUILDER ═══════════ */
.sentence-builder {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.sb-prompt {
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-4);
}

.sb-dropzone {
  min-height: 3.5rem;
  padding: var(--space-3);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  background: var(--color-surface-2);
}

.sb-dropzone.over {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.sb-word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ═══════════ BACK BUTTON ═══════════ */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.back-btn:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

/* ═══════════ FOOTER ═══════════ */
.site-footer {
  padding: var(--space-12) 0 var(--space-8);
  border-top: 1px solid var(--color-divider);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.site-footer a {
  color: var(--color-text-faint);
  text-decoration: none;
}

.site-footer a:hover { color: var(--color-primary); }

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.footer-links a {
  font-weight: 600;
  color: var(--color-text-muted);
}

/* ═══════════ PROGRESS BAR ═══════════ */
.progress-bar {
  height: 6px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: var(--space-4) 0;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-purple));
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
}

/* ═══════════ ANIMATIONS ═══════════ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.animate-in {
  animation: fadeIn 0.4s ease forwards;
}

.animate-slide {
  animation: slideInRight 0.3s ease forwards;
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  animation: fadeIn 0.4s ease forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 60ms; }
.stagger-children > *:nth-child(3) { animation-delay: 120ms; }
.stagger-children > *:nth-child(4) { animation-delay: 180ms; }
.stagger-children > *:nth-child(5) { animation-delay: 240ms; }
.stagger-children > *:nth-child(6) { animation-delay: 300ms; }
.stagger-children > *:nth-child(7) { animation-delay: 360ms; }
.stagger-children > *:nth-child(8) { animation-delay: 420ms; }

/* ═══════════ RESPONSIVE ═══════════ */
@media (max-width: 640px) {
  .container { padding-inline: var(--space-4); }
  .hero h1 { font-size: var(--text-2xl); }
  .matching-area { grid-template-columns: 1fr; }
  .explanation-card { padding: var(--space-4) var(--space-5); }
  .fc-card-container { height: 240px; }
  .example-row { flex-wrap: wrap; gap: var(--space-2); }
  .example-row__native { min-width: 100%; }
  .example-row__romanization { min-width: auto; }
  .lang-header__tabs { gap: var(--space-1); }
  .tab-btn { padding: var(--space-2) var(--space-3); font-size: var(--text-xs); }
}

/* ═══════════ RTL SUPPORT ═══════════ */
.rtl-text { direction: rtl; text-align: right; font-family: 'Noto Sans Arabic', 'Noto Sans Hebrew', 'Amiri', sans-serif; }

/* Script-specific font support */
[data-script="Korean"] .example-row__native,
[data-script="Korean"] .fc-card__word,
[data-script="Korean"] .story-paragraph__native { font-family: 'Noto Sans KR', sans-serif; }

[data-script="Thai"] .example-row__native,
[data-script="Thai"] .fc-card__word,
[data-script="Thai"] .story-paragraph__native { font-family: 'Noto Sans Thai', sans-serif; }

[data-script="Devanagari"] .example-row__native,
[data-script="Devanagari"] .fc-card__word,
[data-script="Devanagari"] .story-paragraph__native { font-family: 'Noto Sans Devanagari', sans-serif; }

[data-script="Hebrew"] .example-row__native,
[data-script="Hebrew"] .fc-card__word,
[data-script="Hebrew"] .story-paragraph__native { font-family: 'Noto Sans Hebrew', sans-serif; }

/* ═══════════ DAILY CHALLENGE ═══════════ */
.daily-challenge {
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  color: white;
  text-align: center;
  margin-bottom: var(--space-8);
  position: relative;
  overflow: hidden;
}

.daily-challenge::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1), transparent 50%);
  pointer-events: none;
}

.daily-challenge h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
  position: relative;
}

.daily-challenge p {
  opacity: 0.85;
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  position: relative;
}

.daily-challenge .btn {
  background: white;
  color: var(--color-primary);
  font-weight: 700;
  position: relative;
}

.daily-challenge .btn:hover {
  background: var(--color-surface-2);
  transform: translateY(-1px);
}

/* Lesson nav buttons */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}

/* ═══════════════════════════════════════════════
   LEVEL FILTER BAR
   ═══════════════════════════════════════════════ */
.lesson-level-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding: var(--space-2);
  background: var(--color-surface-2);
  border-radius: var(--radius-xl);
}

.level-filter-btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  white-space: nowrap;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition-interactive);
}

.level-filter-btn:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.level-filter-btn.active {
  color: white;
  border-color: transparent;
}

.level-filter-btn.active:not([class*="--"]),
.level-filter-btn.active.level-filter-btn--all {
  background: var(--color-text);
  color: var(--color-text-inverse);
}

.level-filter-btn--a1.active { background: linear-gradient(135deg, var(--color-teal), #0d9488); }
.level-filter-btn--a2.active { background: linear-gradient(135deg, var(--color-primary), #4338ca); }
.level-filter-btn--b1.active { background: linear-gradient(135deg, var(--color-accent), #d97706); }
.level-filter-btn--b2.active { background: linear-gradient(135deg, var(--color-rose), #be123c); }

/* Small level badge variant */
.level-badge--sm {
  width: 1.75rem;
  height: 1.75rem;
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

/* ═══════════════════════════════════════════════
   STORIES — Level Groups, Cards & Reader
   ═══════════════════════════════════════════════ */
.stories-view {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.story-level-group {
  margin-bottom: var(--space-4);
}

.story-level-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.story-level-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.story-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.story-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  cursor: pointer;
  transition: all var(--transition-interactive);
}

.story-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 20px rgba(91, 76, 240, 0.1);
  transform: translateY(-2px);
}

[data-theme="dark"] .story-card:hover {
  box-shadow: 0 4px 20px rgba(91, 76, 240, 0.2);
}

.story-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.story-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}

.story-card__native {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.story-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-3);
}

.story-card__meta {
  display: flex;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* Story Reader */
.story-progress-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.story-paragraph-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
}

.story-paragraph__native {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.story-paragraph__romanization {
  font-size: var(--text-sm);
  color: var(--color-purple);
  font-style: italic;
  margin-bottom: var(--space-3);
}

.story-paragraph__translation {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.6;
  padding-top: var(--space-3);
  border-top: 1px dashed var(--color-divider);
}

.story-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.story-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

/* Story Vocabulary */
.story-vocab-section {
  margin-top: var(--space-8);
}

.story-vocab-section h3,
.story-quiz-section h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.story-vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.story-vocab-item {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: all var(--transition-interactive);
}

.story-vocab-item:hover {
  border-color: var(--color-primary);
}

.story-vocab-item__word {
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}

.story-vocab-item__romanization {
  font-size: var(--text-xs);
  color: var(--color-purple);
  font-style: italic;
}

.story-vocab-item__translation {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* Story Quiz */
.story-quiz-section {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 2px solid var(--color-divider);
}

/* ═══════════════════════════════════════════════
   GAMES — Grid, Cards, Arena & Mini-Games
   ═══════════════════════════════════════════════ */
.games-view {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}

.game-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  cursor: pointer;
  transition: all var(--transition-interactive);
  text-align: center;
}

.game-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 20px rgba(91, 76, 240, 0.1);
  transform: translateY(-2px);
}

[data-theme="dark"] .game-card:hover {
  box-shadow: 0 4px 20px rgba(91, 76, 240, 0.2);
}

.game-card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
}

.game-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.game-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-3);
}

.game-card__meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
}

/* Game Arena (shared layout for all games) */
.game-arena {
  max-width: var(--content-default);
  margin: 0 auto;
}

.game-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.game-header h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.game-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.game-score {
  color: var(--color-primary);
}

.game-timer {
  color: var(--color-rose);
}

/* Game Results (shared) */
.game-results {
  text-align: center;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
}

.game-results__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.game-results__score {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.game-results__detail {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.game-results__detail-list {
  text-align: left;
  max-width: 400px;
  margin: 0 auto var(--space-6);
  font-size: var(--text-sm);
}

.game-results__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ── Word Sprint ── */
.ws-prompt {
  text-align: center;
  margin-bottom: var(--space-6);
}
.ws-prompt p,
.sb-prompt p,
.ss-prompt p {
  max-width: none;
}

.ws-english-word {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.ws-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  max-width: 500px;
  margin: 0 auto;
}

/* ── Memory Match ── */
.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  max-width: 500px;
  margin: 0 auto var(--space-6);
}

.memory-card {
  aspect-ratio: 3 / 2;
  perspective: 600px;
  cursor: pointer;
  min-height: 80px;
}

.memory-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s ease;
  transform-style: preserve-3d;
}

.memory-card--flipped .memory-card__inner {
  transform: rotateY(180deg);
}

.memory-card--matched .memory-card__inner {
  transform: rotateY(180deg);
}

.memory-card--matched {
  opacity: 0.6;
  pointer-events: none;
}

.memory-card__front,
.memory-card__back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  backface-visibility: hidden;
  border: 1.5px solid var(--color-divider);
  font-weight: 600;
  font-size: clamp(0.65rem, 2.5vw, 0.85rem);
  padding: var(--space-1) var(--space-2);
  text-align: center;
  overflow-wrap: break-word;
  word-break: break-word;
  line-height: 1.3;
}

.memory-card__front {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  transform: rotateY(180deg);
}

.memory-card__back {
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}

.memory-card__label {
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.6;
  margin-bottom: 2px;
  line-height: 1;
}

/* ── Spelling Bee ── */
.sb-prompt {
  text-align: center;
  margin-bottom: var(--space-6);
}

.sb-english-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.sb-result-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
}

.sb-result--correct {
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
  color: var(--color-success);
}

.sb-result--wrong {
  background: color-mix(in srgb, var(--color-error) 10%, transparent);
  color: var(--color-error);
}

/* ── Sentence Scramble ── */
.ss-prompt {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--space-4);
}

/* ═══════════════════════════════════════════════
   RESPONSIVE — New Components
   ═══════════════════════════════════════════════ */
@media (max-width: 768px) {
  .lesson-level-filters {
    gap: var(--space-1);
  }
  .level-filter-btn {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
  }
  .story-cards-grid {
    grid-template-columns: 1fr;
  }
  .games-grid {
    grid-template-columns: 1fr 1fr;
  }
  .memory-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-2);
    max-width: 100%;
  }
  .memory-card {
    min-height: 70px;
  }
  .memory-card__front,
  .memory-card__back {
    font-size: clamp(0.55rem, 2.2vw, 0.75rem);
  }
  .ws-options {
    grid-template-columns: 1fr;
  }
  .story-vocab-grid {
    grid-template-columns: 1fr;
  }
  .game-stats {
    gap: var(--space-3);
  }
}

@media (max-width: 480px) {
  .games-grid {
    grid-template-columns: 1fr;
  }
  .story-paragraph__native {
    font-size: var(--text-base);
  }
  .memory-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }
  .memory-card {
    aspect-ratio: auto;
    min-height: 60px;
  }
  .memory-card__front,
  .memory-card__back {
    font-size: 0.58rem;
    padding: 3px;
  }
}

/* ═══════════ DISCOVER LANGUAGE PAGE ═══════════ */
.discover-page {
  max-width: 780px;
  margin: 0 auto;
  padding-bottom: var(--space-16);
}

.discover-hero {
  text-align: center;
  margin-bottom: var(--space-10);
  padding: var(--space-8) 0;
}

.discover-hero__flag {
  font-size: 3.5rem;
  margin-bottom: var(--space-3);
}

.discover-hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.discover-hero__native {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.discover-hero__hook {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto;
  font-style: italic;
}

.discover-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}

.discover-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
  min-width: 130px;
}

.discover-stat__value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
}

.discover-stat__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.discover-section {
  margin-bottom: var(--space-10);
}

.discover-section__heading {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.discover-section__text {
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
}

.discover-section__text p {
  margin-bottom: var(--space-4);
}

.discover-section__text p:last-child {
  margin-bottom: 0;
}

.discover-section__text strong {
  color: var(--color-text);
  font-weight: 700;
}

.discover-section__text ul {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0;
}

.discover-section__text ul li {
  padding: var(--space-2) 0;
  padding-left: var(--space-5);
  position: relative;
}

.discover-section__text ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.discover-family-tree {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.discover-family-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

.discover-family-tag--current {
  background: var(--color-primary);
  color: #fff;
}

.discover-difficulty {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: var(--space-4) 0;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-xl);
}

.discover-difficulty__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 600;
}

.discover-difficulty__level {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 800;
}

.discover-difficulty__dots {
  display: flex;
  gap: 4px;
}

.discover-difficulty__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-divider);
}

.discover-difficulty__dot--filled {
  background: var(--color-primary);
}

.discover-facts {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.discover-fact {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-divider);
}

.discover-fact__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.discover-fact__text {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-text);
}

.discover-cta {
  text-align: center;
  padding: var(--space-8) 0;
  margin-top: var(--space-4);
}

.discover-cta__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

@media (max-width: 640px) {
  .discover-hero__flag { font-size: 2.5rem; }
  .discover-hero__title { font-size: var(--text-xl); }
  .discover-stats { gap: var(--space-3); }
  .discover-stat { min-width: 100px; padding: var(--space-3); }
  .discover-stat__value { font-size: var(--text-lg); }
}

/* ═══════════ THEMED SCROLLBAR ═══════════ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-surface-2);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-faint);
}
/* Firefox */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-surface-2);
}

/* ═══════════════════════════════════════════
   COMMUNITY FEATURES — Activity Pulse
   ═══════════════════════════════════════════ */
.activity-pulse {
  padding: var(--space-6) 0;
  text-align: center;
}
.activity-pulse .section-header {
  margin-bottom: var(--space-5);
}
.pulse-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  max-width: 900px;
  margin: 0 auto;
}
.pulse-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.pulse-stat:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
.pulse-stat__icon {
  font-size: 28px;
  line-height: 1;
}
.pulse-stat__value {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.pulse-stat__label {
  font-size: 13px;
  color: var(--color-text-muted);
  letter-spacing: 0.01em;
}
@media (max-width: 600px) {
  .pulse-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }
  .pulse-stat__value {
    font-size: 22px;
  }
}

/* ═══════════════════════════════════════════
   COMMUNITY FEATURES — Milestone Share Modal
   ═══════════════════════════════════════════ */
.milestone-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.milestone-modal.active {
  opacity: 1;
  pointer-events: auto;
}
.milestone-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
}
.milestone-modal__content {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  max-width: 680px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(16px);
  transition: transform 0.3s ease;
}
.milestone-modal.active .milestone-modal__content {
  transform: translateY(0);
}
.milestone-modal__close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 24px;
  cursor: pointer;
  padding: var(--space-1);
  line-height: 1;
}
.milestone-modal__close:hover {
  color: var(--color-text);
}
.milestone-modal__content h3 {
  margin: 0 0 var(--space-4);
  font-size: 20px;
  color: var(--color-text);
}
.milestone-modal__preview {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-4);
}
.milestone-modal__preview canvas {
  width: 100%;
  height: auto;
  display: block;
}
.milestone-modal__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
}
@media (max-width: 500px) {
  .milestone-modal__actions {
    flex-direction: column;
  }
}

/* Share prompt toast */
.share-prompt {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
}
.share-prompt.active {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.share-prompt__content {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  font-size: 14px;
  color: var(--color-text);
  white-space: nowrap;
}
.btn--sm {
  padding: 6px 14px;
  font-size: 13px;
  border-radius: var(--radius-md);
}
.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}
@media (max-width: 500px) {
  .share-prompt__content {
    flex-wrap: wrap;
    justify-content: center;
    white-space: normal;
    text-align: center;
  }
}

/* ═══════════════════════════════════════════
   COMMUNITY FEATURES — Leaderboard
   ═══════════════════════════════════════════ */
.leaderboard {
  max-width: 680px;
  margin: 0 auto;
}
.leaderboard__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}
.leaderboard__header h3 {
  margin: 0;
  font-size: 22px;
  color: var(--color-text);
}
.leaderboard__week {
  font-size: 13px;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}
.leaderboard__opt-in {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  background: var(--color-surface-2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}
.leaderboard__opt-in-icon {
  font-size: 48px;
  margin-bottom: var(--space-3);
}
.leaderboard__opt-in p {
  max-width: none;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-size: 15px;
}
.leaderboard__name-input {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}
.leaderboard__name-input input {
  max-width: 220px;
}
.leaderboard__tabs {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-3);
}
.leaderboard__tab {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
}
.leaderboard__tab:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}
.leaderboard__tab.active {
  color: var(--color-primary);
  background: rgba(91, 76, 240, 0.1);
}
.leaderboard__lang-select select {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}
.leaderboard__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.leaderboard__row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  transition: background 0.15s ease;
}
.leaderboard__row:hover {
  background: var(--color-surface-3, rgba(255,255,255,0.05));
}
.leaderboard__row--top {
  background: linear-gradient(135deg, rgba(91, 76, 240, 0.06), rgba(139, 92, 246, 0.06));
  border: 1px solid rgba(91, 76, 240, 0.15);
}
.leaderboard__row--me {
  background: linear-gradient(135deg, rgba(91, 76, 240, 0.12), rgba(139, 92, 246, 0.08));
  border: 1px solid rgba(91, 76, 240, 0.25);
}
.leaderboard__rank {
  width: 36px;
  text-align: center;
  font-size: 20px;
  flex-shrink: 0;
}
.leaderboard__rank-num {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
}
.leaderboard__user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  min-width: 0;
}
.leaderboard__level-icon {
  font-size: 20px;
  flex-shrink: 0;
}
.leaderboard__name {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.leaderboard__you {
  font-size: 11px;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-left: 4px;
}
.leaderboard__xp {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  flex-shrink: 0;
}
.leaderboard__empty {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  color: var(--color-text-muted);
}
.leaderboard__empty-icon {
  font-size: 48px;
  margin-bottom: var(--space-3);
  opacity: 0.5;
}
.leaderboard__empty p {
  max-width: none;
  font-size: 15px;
}
.leaderboard__loading {
  text-align: center;
  padding: var(--space-6);
  color: var(--color-text-muted);
  font-size: 14px;
}

/* Dashboard share button */
.dashboard-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.dashboard-share-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ═══════════════════════════════════════════════
   GROWTH FEATURES — Referral, Challenge, Streak
   ═══════════════════════════════════════════════ */

/* --- Challenge Banner --- */
.challenge-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9000;
  background: linear-gradient(135deg, #5B4CF0, #8B5CF6);
  color: #fff;
  padding: 12px 20px;
  animation: challengeSlideDown 0.4s cubic-bezier(0.22,1,0.36,1);
}
.challenge-banner--hide {
  animation: challengeSlideUp 0.4s ease forwards;
}
@keyframes challengeSlideDown {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}
@keyframes challengeSlideUp {
  from { transform: translateY(0); }
  to { transform: translateY(-100%); }
}
.challenge-banner__content {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 960px;
  margin: 0 auto;
  font-family: 'Nunito', sans-serif;
}
.challenge-banner__icon {
  font-size: 24px;
  flex-shrink: 0;
}
.challenge-banner__text {
  flex: 1;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}
.challenge-banner__text strong {
  font-weight: 800;
  color: #fff;
}
.challenge-banner__close {
  flex-shrink: 0;
  background: rgba(255,255,255,0.2);
  border: none;
  color: #fff;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.challenge-banner__close:hover {
  background: rgba(255,255,255,0.35);
}

/* --- Challenge Button in Game Results --- */
.game-results__challenge-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  margin-top: 8px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #F59E0B, #F97316);
  color: #fff;
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.game-results__challenge-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(249, 115, 22, 0.35);
}

/* --- Challenge Signup CTA --- */
.challenge-signup-cta {
  margin-top: 16px;
  padding: 14px 20px;
  background: linear-gradient(135deg, rgba(91,76,240,0.06), rgba(139,92,246,0.06));
  border: 1.5px solid rgba(91,76,240,0.2);
  border-radius: 12px;
  text-align: center;
}
.challenge-signup-cta p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  max-width: none;
}

/* --- Referral Card --- */
.referral-card {
  background: var(--color-surface);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  border: 1px solid var(--color-surface-2);
}
.referral-card__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.referral-card__icon {
  font-size: 36px;
  flex-shrink: 0;
}
.referral-card__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
}
.referral-card__desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.4;
}
.referral-card__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-surface-2);
  border-radius: 10px;
  margin-bottom: 12px;
}
.referral-card__code {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.referral-card__code-label {
  font-size: 12px;
  color: var(--color-text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.referral-card__code-value {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-primary);
  font-family: monospace;
  letter-spacing: 1px;
}
.referral-card__copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  color: #fff;
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  white-space: nowrap;
  flex-shrink: 0;
}
.referral-card__copy-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(91,76,240,0.3);
}
.referral-card__stats {
  text-align: center;
}
.referral-card__stat-count {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* --- Daily Streak in Dashboard --- */
.dashboard-streak {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--color-surface);
  border-radius: 12px;
  border: 1px solid var(--color-surface-2);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.dashboard-streak--milestone {
  border-color: #F59E0B;
  background: linear-gradient(135deg, rgba(245,158,11,0.06), rgba(249,115,22,0.06));
}
.dashboard-streak__flame {
  font-size: 28px;
  line-height: 1;
}
.dashboard-streak__flame--pulse {
  animation: flamePulse 1.5s ease-in-out infinite;
}
@keyframes flamePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}
.dashboard-streak__count {
  font-size: 16px;
  font-weight: 800;
  color: var(--color-text);
}
.dashboard-streak__best {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 600;
}

/* --- Stat card streak variant --- */
.stat-card--streak .stat-card__value {
  color: #F59E0B;
}

/* --- Mobile responsive for growth features --- */
@media (max-width: 640px) {
  .referral-card__link {
    flex-direction: column;
    text-align: center;
  }
  .referral-card__code {
    align-items: center;
  }
  .challenge-banner__content {
    font-size: 13px;
  }
  .challenge-banner__icon {
    font-size: 20px;
  }
}

/* ═══════════ LEGAL PAGES ═══════════ */
.legal-doc {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-8) 0 var(--space-16);
}

.legal-doc h1 {
  font-size: var(--text-3xl);
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.legal-updated {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-8);
  max-width: none;
}

.legal-doc h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-top: var(--space-10);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.legal-doc h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.legal-doc p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: none;
}

.legal-doc ul {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.legal-doc li {
  margin-bottom: var(--space-2);
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: none;
}

.legal-doc a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 40%, transparent);
  text-underline-offset: 2px;
}

.legal-doc a:hover {
  text-decoration-color: var(--color-primary);
}

/* ═══════════ COOKIE CONSENT BANNER ═══════════ */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  box-shadow: 0 -4px 24px rgba(0,0,0,0.1);
  transform: translateY(100%);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
}

.cookie-banner--visible {
  transform: translateY(0);
  opacity: 1;
}

.cookie-banner__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.cookie-banner__text {
  flex: 1;
}

.cookie-banner__text p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
  max-width: none;
  line-height: 1.5;
}

.cookie-banner__text a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.cookie-banner__actions {
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .cookie-banner__inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
    padding: var(--space-4);
  }
}

/* ═══════════ FOOTER LEGAL LINKS ═══════════ */
.footer-legal {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
}

.footer-legal a {
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer-legal a:hover {
  color: var(--color-primary);
}

.footer-legal__sep {
  color: var(--color-text-faint);
  opacity: 0.5;
}

.footer-attribution {
  text-align: center;
  margin: var(--space-2) 0 0;
  max-width: none;
  font-size: var(--text-xs);
}

.footer-attribution a {
  color: var(--color-text-faint);
  text-decoration: none;
  opacity: 0.7;
}

.footer-attribution a:hover {
  opacity: 1;
  color: var(--color-primary);
}

/* ═══════════ CONTACT FORM ═══════════ */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.contact-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.contact-field label {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.contact-field input,
.contact-field select,
.contact-field textarea {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-base);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-field input:focus,
.contact-field select:focus,
.contact-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent);
}

.contact-field input::placeholder,
.contact-field textarea::placeholder {
  color: var(--color-text-faint);
}

.contact-field textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-field select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: var(--space-10);
}

.contact-form .btn--primary {
  align-self: flex-start;
  margin-top: var(--space-2);
}

.contact-form .btn--primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.contact-success {
  text-align: center;
  padding: var(--space-12) 0;
}

.contact-success__icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-success);
  color: #fff;
  font-size: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-6);
}

.contact-success h2 {
  margin-bottom: var(--space-3);
}

.contact-success p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  max-width: none;
}

.contact-error {
  text-align: center;
  padding: var(--space-8) 0;
}

.contact-error p {
  color: var(--color-rose);
  margin-bottom: var(--space-4);
  max-width: none;
}