/* ===================================
   SAMBO LEARN - Premium Dark Theme
   Inspired by: Peloton, BJJ Fanatics, Duolingo
   =================================== */

/* CSS Variables - Dark Theme (Default) */
:root {
  /* Background Colors */
  --bg-primary: #0a0a0b;
  --bg-secondary: #121214;
  --bg-card: #1a1a1d;
  --bg-card-hover: #222225;
  --bg-elevated: #252528;

  /* Accent Colors */
  --accent: #00d4aa;
  --accent-light: #00ffcc;
  --accent-dark: #00a888;
  --accent-glow: rgba(0, 212, 170, 0.3);

  /* Secondary Accent (warm) */
  --accent-warm: #ff6b35;
  --accent-warm-light: #ff8c5a;

  /* XP / Gold */
  --gold: #ffd23f;
  --gold-light: #ffe066;
  --gold-glow: rgba(255, 210, 63, 0.3);

  /* Streak / Fire */
  --fire: #ff4757;
  --fire-light: #ff6b7a;
  --fire-glow: rgba(255, 71, 87, 0.3);

  /* Text */
  --text-primary: #ffffff;
  --text-secondary: #a0a0a5;
  --text-muted: #6b6b70;
  --text-on-accent: #0a0a0b;

  /* Status Colors */
  --success: #00d4aa;
  --warning: #ffd23f;
  --error: #ff4757;
  --info: #5b8def;

  /* Borders */
  --border-color: #2a2a2d;
  --border-light: #3a3a3d;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-accent: 0 4px 30px var(--accent-glow);
  --shadow-gold: 0 4px 30px var(--gold-glow);
  --shadow-fire: 0 4px 30px var(--fire-glow);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Gradients */
  --gradient-accent: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  --gradient-gold: linear-gradient(135deg, var(--gold) 0%, var(--accent-warm) 100%);
  --gradient-fire: linear-gradient(135deg, var(--fire) 0%, var(--accent-warm) 100%);
  --gradient-dark: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  --gradient-card: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0f2;
  --bg-elevated: #ffffff;

  --text-primary: #1a1a1d;
  --text-secondary: #6b6b70;
  --text-muted: #a0a0a5;

  --border-color: #e5e5e7;
  --border-light: #d0d0d2;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.16);
}

/* ===================================
   Reset & Base
   =================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal);
}

::selection {
  background: var(--accent);
  color: var(--text-on-accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-light);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

h4 {
  font-size: 1.125rem;
}

.text-gradient {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gold {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-fire {
  color: var(--fire);
}

/* ===================================
   Layout
   =================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-xl);
  }
}

.section {
  padding: var(--space-3xl) 0;
}

@media (max-width: 767px) {
  .section {
    padding: var(--space-2xl) 0;
  }
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: repeat(2, 1fr); }

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .grid { gap: var(--space-lg); }
}

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--text-on-accent);
  box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 40px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
}

.btn-ghost:hover {
  background: var(--bg-card);
}

.btn-lg {
  padding: var(--space-lg) var(--space-xl);
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* ===================================
   Cards
   =================================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

.card-glow {
  position: relative;
  overflow: hidden;
}

.card-glow::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

.card-accent {
  background: var(--gradient-accent);
  border: none;
  color: var(--text-on-accent);
}

.card-gold {
  background: linear-gradient(135deg, rgba(255, 210, 63, 0.15) 0%, rgba(255, 107, 53, 0.1) 100%);
  border-color: rgba(255, 210, 63, 0.3);
}

.card-fire {
  background: linear-gradient(135deg, rgba(255, 71, 87, 0.15) 0%, rgba(255, 107, 53, 0.1) 100%);
  border-color: rgba(255, 71, 87, 0.3);
}

/* ===================================
   Header
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] .header {
  background: rgba(255, 255, 255, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 var(--space-md);
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .header-inner {
    padding: 0 var(--space-xl);
  }
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
}

.logo:hover {
  color: var(--text-primary);
}

.logo-icon {
  font-size: 1.5rem;
}

.nav {
  display: none;
  gap: var(--space-xs);
}

@media (min-width: 768px) {
  .nav {
    display: flex;
  }
}

.nav-link {
  padding: var(--space-sm) var(--space-md);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-link.active {
  color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  color: var(--accent);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-primary);
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse at 20% 20%, var(--accent-glow) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, var(--gold-glow) 0%, transparent 50%);
  opacity: 0.5;
  animation: heroGlow 10s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-5%, -5%) rotate(5deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.hero-badge .badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: var(--radius-full);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero h1 {
  margin-bottom: var(--space-lg);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

@media (min-width: 480px) {
  .hero-cta {
    flex-direction: row;
    justify-content: center;
  }
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.hero-stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.hero-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ===================================
   Features Section
   =================================== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
}

.feature-card {
  padding: var(--space-xl);
  text-align: center;
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
  background: var(--gradient-accent);
  border-color: transparent;
  transform: scale(1.1);
}

.feature-card h3 {
  margin-bottom: var(--space-sm);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* ===================================
   Stats Preview
   =================================== */
.stats-preview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .stats-preview {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-card {
  padding: var(--space-lg);
  text-align: center;
}

.stat-card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.stat-card-value {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.stat-card-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.stat-card.xp .stat-card-value { color: var(--gold); }
.stat-card.streak .stat-card-value { color: var(--fire); }
.stat-card.achievements .stat-card-value { color: var(--accent); }

/* ===================================
   Progress Path
   =================================== */
.path-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .path-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.path-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.path-item:hover {
  border-color: var(--path-color, var(--border-light));
  background: var(--bg-card-hover);
}

.path-level-badge {
  width: 48px;
  height: 48px;
  background: var(--path-color, var(--bg-elevated));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--text-on-accent);
  flex-shrink: 0;
}

.path-info h4 {
  margin-bottom: var(--space-xs);
}

.path-info p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.path-levels {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* Path Colors */
.path-item[data-level="1"] { --path-color: #6b6b70; }
.path-item[data-level="2"] { --path-color: #a8d5ba; }
.path-item[data-level="3"] { --path-color: #ffd23f; }
.path-item[data-level="4"] { --path-color: #ff9f43; }
.path-item[data-level="5"] { --path-color: #5b8def; }
.path-item[data-level="6"] { --path-color: #ff4757; }
.path-item[data-level="7"] { --path-color: #00d4aa; }

/* ===================================
   Pricing
   =================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: 900px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: center;
  }
}

.pricing-card {
  padding: var(--space-xl);
  text-align: center;
}

.pricing-card.featured {
  background: var(--gradient-accent);
  border: none;
  color: var(--text-on-accent);
  transform: scale(1.02);
}

@media (min-width: 768px) {
  .pricing-card.featured {
    transform: scale(1.05);
    padding: var(--space-2xl) var(--space-xl);
  }
}

.pricing-badge {
  display: inline-block;
  background: rgba(0, 0, 0, 0.2);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.pricing-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.pricing-price {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  opacity: 0.7;
}

.pricing-features {
  text-align: left;
  margin: var(--space-lg) 0;
}

.pricing-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  font-size: 0.9375rem;
}

.pricing-feature::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
}

.pricing-card.featured .pricing-feature::before {
  color: var(--text-on-accent);
}

.pricing-card .btn {
  width: 100%;
}

.pricing-card.featured .btn {
  background: var(--bg-primary);
  color: var(--text-primary);
}

.pricing-card.featured .btn:hover {
  background: var(--bg-card);
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--bg-secondary);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-link:hover {
  color: var(--accent);
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* ===================================
   Dashboard Layout
   =================================== */
.dashboard {
  display: flex;
  min-height: 100vh;
  padding-top: 64px;
}

/* Sidebar */
.sidebar {
  display: none;
  width: 240px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: var(--space-lg);
  position: fixed;
  top: 64px;
  left: 0;
  bottom: 0;
  overflow-y: auto;
}

@media (min-width: 768px) {
  .sidebar {
    display: flex;
    flex-direction: column;
  }
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.sidebar-link:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.sidebar-link.active {
  background: var(--gradient-accent);
  color: var(--text-on-accent);
}

.sidebar-icon {
  font-size: 1.25rem;
  width: 24px;
  text-align: center;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: var(--space-lg);
  background: var(--bg-primary);
  min-height: calc(100vh - 64px);
}

@media (min-width: 768px) {
  .main-content {
    margin-left: 240px;
    padding: var(--space-xl);
  }
}

/* Dashboard Stats */
.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .dashboard-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.dashboard-stat {
  padding: var(--space-lg);
  text-align: center;
}

.dashboard-stat-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.dashboard-stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.dashboard-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Level Progress */
.level-progress {
  margin-bottom: var(--space-xl);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.progress-level {
  font-weight: 700;
}

.progress-level-name {
  color: var(--text-secondary);
  font-weight: 400;
  margin-left: var(--space-sm);
}

.progress-xp {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.progress-bar {
  height: 12px;
  background: var(--bg-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.progress-fill {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  transition: width 1s ease-out;
}

.progress-footer {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Continue Card */
.continue-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

@media (min-width: 640px) {
  .continue-card {
    flex-direction: row;
    align-items: center;
  }
}

.continue-info {
  flex: 1;
}

.continue-label {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
}

.continue-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.continue-meta {
  display: flex;
  gap: var(--space-md);
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Lesson List */
.lessons-section {
  margin-bottom: var(--space-xl);
}

.section-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.section-title h2 {
  font-size: 1.25rem;
}

.section-title a {
  font-size: 0.875rem;
}

.lesson-filters {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-md);
  -webkit-overflow-scrolling: touch;
}

.filter-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--gradient-accent);
  border-color: transparent;
  color: var(--text-on-accent);
}

.lesson-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lesson-item:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.lesson-item.completed {
  opacity: 0.7;
}

.lesson-item.locked {
  opacity: 0.4;
  cursor: not-allowed;
}

.lesson-status {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.lesson-status.completed {
  background: var(--success);
  color: var(--text-on-accent);
}

.lesson-status.available {
  background: var(--gradient-accent);
  color: var(--text-on-accent);
}

.lesson-status.locked {
  background: var(--bg-elevated);
  color: var(--text-muted);
}

.lesson-info {
  flex: 1;
  min-width: 0;
}

.lesson-title {
  font-weight: 600;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.lesson-xp {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--gold);
  font-size: 0.875rem;
}

/* Achievement Grid */
.achievements-section {
  margin-bottom: var(--space-xl);
}

.achievement-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
}

@media (min-width: 640px) {
  .achievement-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (min-width: 768px) {
  .achievement-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}

.achievement-item {
  aspect-ratio: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.achievement-item.unlocked {
  background: var(--card-gold);
  border-color: var(--gold);
  box-shadow: var(--shadow-gold);
}

.achievement-item.locked {
  opacity: 0.3;
  filter: grayscale(1);
}

.achievement-item:hover {
  transform: scale(1.1);
}

/* Weekly Activity */
.activity-section {
  margin-bottom: var(--space-xl);
}

.activity-week {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
}

.activity-day {
  flex: 1;
  text-align: center;
}

.activity-day-label {
  font-size: 0.625rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.activity-day-dot {
  width: 100%;
  aspect-ratio: 1;
  max-width: 36px;
  margin: 0 auto;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  border: 1px solid var(--border-color);
}

.activity-day-dot.active {
  background: var(--success);
  border-color: var(--success);
  color: var(--text-on-accent);
}

.activity-day-dot.today {
  background: var(--gradient-accent);
  border-color: transparent;
  box-shadow: var(--shadow-accent);
}

/* Leaderboard */
.leaderboard-section {
  margin-bottom: var(--space-xl);
}

.leaderboard-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.leaderboard-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
}

.leaderboard-item.gold {
  background: linear-gradient(90deg, rgba(255, 210, 63, 0.15), transparent);
}

.leaderboard-item.silver {
  background: linear-gradient(90deg, rgba(192, 192, 192, 0.15), transparent);
}

.leaderboard-item.bronze {
  background: linear-gradient(90deg, rgba(205, 127, 50, 0.15), transparent);
}

.leaderboard-item.current {
  background: var(--gradient-accent);
  color: var(--text-on-accent);
}

.leaderboard-rank {
  width: 32px;
  font-size: 1.25rem;
  text-align: center;
}

.leaderboard-name {
  flex: 1;
  font-weight: 600;
}

.leaderboard-xp {
  font-family: var(--font-mono);
  color: var(--gold);
}

.leaderboard-item.current .leaderboard-xp {
  color: inherit;
}

/* Mobile Bottom Nav */
.mobile-nav {
  display: flex;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-sm) var(--space-xs);
  padding-bottom: max(var(--space-sm), env(safe-area-inset-bottom));
  z-index: 1000;
}

@media (min-width: 768px) {
  .mobile-nav {
    display: none;
  }
}

.mobile-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
  color: var(--accent);
}

.mobile-nav-icon {
  font-size: 1.25rem;
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes bounceIn {
  0% { opacity: 0; transform: scale(0.3); }
  50% { transform: scale(1.05); }
  70% { transform: scale(0.9); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px var(--accent-glow); }
  50% { box-shadow: 0 0 40px var(--accent-glow), 0 0 60px var(--accent-glow); }
}

@keyframes flame {
  0%, 100% { transform: scaleY(1) rotate(-3deg); }
  25% { transform: scaleY(1.1) rotate(2deg); }
  50% { transform: scaleY(0.95) rotate(-2deg); }
  75% { transform: scaleY(1.05) rotate(3deg); }
}

@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes ripple {
  0% { transform: scale(0); opacity: 0.5; }
  100% { transform: scale(4); opacity: 0; }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2); opacity: 0; }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes typewriter {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Animation Classes */
.animate-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.animate-slide-up {
  animation: slideUp 0.8s ease forwards;
}

.animate-slide-left {
  animation: slideInLeft 0.6s ease forwards;
}

.animate-slide-right {
  animation: slideInRight 0.6s ease forwards;
}

.animate-scale-in {
  animation: scaleIn 0.5s ease forwards;
}

.animate-bounce-in {
  animation: bounceIn 0.6s ease forwards;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

.animate-glow {
  animation: glow 2s ease-in-out infinite;
}

.animate-shake {
  animation: shake 0.5s ease;
}

.flame-animate {
  animation: flame 0.5s ease-in-out infinite;
  display: inline-block;
  transform-origin: bottom center;
}

/* Shimmer loading effect */
.shimmer {
  background: linear-gradient(
    90deg,
    var(--bg-card) 25%,
    var(--bg-elevated) 50%,
    var(--bg-card) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

/* Gradient animation */
.gradient-animate {
  background-size: 200% 200%;
  animation: gradient-shift 3s ease infinite;
}

/* Ripple effect */
.ripple-effect {
  position: relative;
  overflow: hidden;
}

.ripple-effect::after {
  content: '';
  position: absolute;
  width: 100px;
  height: 100px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: scale(0);
  pointer-events: none;
}

.ripple-effect:active::after {
  animation: ripple 0.6s ease-out;
}

/* Pulse ring for notifications */
.pulse-ring {
  position: relative;
}

.pulse-ring::before {
  content: '';
  position: absolute;
  inset: -4px;
  border: 2px solid var(--accent);
  border-radius: inherit;
  animation: pulse-ring 1.5s ease-out infinite;
}

/* Hover lift effect */
.hover-lift {
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* Hover scale effect */
.hover-scale {
  transition: transform var(--transition-fast);
}

.hover-scale:hover {
  transform: scale(1.02);
}

/* Hover glow effect */
.hover-glow {
  transition: box-shadow var(--transition-normal);
}

.hover-glow:hover {
  box-shadow: var(--shadow-accent);
}

/* Stagger delays */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }
.delay-6 { animation-delay: 0.6s; }

/* Interactive Cards */
.card-interactive {
  cursor: pointer;
  transition: all var(--transition-normal);
}

.card-interactive:hover {
  transform: translateY(-4px) scale(1.01);
  border-color: var(--accent);
  box-shadow: var(--shadow-accent);
}

.card-interactive:active {
  transform: translateY(-2px) scale(0.99);
}

/* Animated Counter */
.counter {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

.counter.counting {
  animation: countUp 0.3s ease;
}

/* Progress bar animations */
.progress-animated .progress-fill {
  position: relative;
  overflow: hidden;
}

.progress-animated .progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: shimmer 2s infinite;
}

/* Notification badge */
.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--fire);
  color: white;
  font-size: 0.625rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: bounceIn 0.4s ease;
}

/* XP popup animation */
.xp-popup {
  position: fixed;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold);
  pointer-events: none;
  animation: xp-float 1.5s ease-out forwards;
  z-index: 9999;
  text-shadow: 0 2px 10px var(--gold-glow);
}

@keyframes xp-float {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  50% { opacity: 1; transform: translateY(-30px) scale(1.2); }
  100% { opacity: 0; transform: translateY(-60px) scale(0.8); }
}

/* Achievement unlock animation */
.achievement-unlock {
  animation: achievement-pop 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

@keyframes achievement-pop {
  0% { transform: scale(0) rotate(-180deg); opacity: 0; }
  50% { transform: scale(1.2) rotate(10deg); }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

/* Streak fire enhanced */
.streak-fire {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.streak-fire::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: var(--fire-glow);
  border-radius: 50%;
  filter: blur(15px);
  animation: glow 1.5s ease-in-out infinite;
  z-index: -1;
}

/* Button press effect */
.btn-press {
  transition: transform 0.1s ease;
}

.btn-press:active {
  transform: scale(0.95);
}

/* Skeleton loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-elevated) 25%,
    var(--bg-card-hover) 50%,
    var(--bg-elevated) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 1em;
  margin-bottom: 0.5em;
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-circle {
  border-radius: 50%;
}

/* Typewriter effect */
.typewriter {
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--accent);
  animation:
    typewriter 2s steps(30) forwards,
    blink 0.7s step-end infinite;
}

/* Parallax container */
.parallax-container {
  perspective: 1000px;
}

.parallax-layer {
  transform-style: preserve-3d;
  will-change: transform;
}

/* ===================================
   Utilities
   =================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.hidden { display: none !important; }

@media (max-width: 767px) {
  .hide-mobile { display: none !important; }
}

@media (min-width: 768px) {
  .hide-desktop { display: none !important; }
}

/* Safe area padding for mobile */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .main-content {
    padding-bottom: calc(var(--space-xl) + 80px);
  }

  @media (min-width: 768px) {
    .main-content {
      padding-bottom: var(--space-xl);
    }
  }
}

/* ===================================
   Enhanced Dashboard Components
   =================================== */

/* Animated Welcome */
.welcome-section {
  position: relative;
  overflow: hidden;
}

.welcome-section::before {
  content: '';
  position: absolute;
  top: -100%;
  left: -100%;
  width: 300%;
  height: 300%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.3;
  animation: float 8s ease-in-out infinite;
}

/* Interactive Stat Cards */
.stat-card-interactive {
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.stat-card-interactive::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.1), transparent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.stat-card-interactive:hover::before {
  width: 300px;
  height: 300px;
}

.stat-card-interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-card-interactive:active {
  transform: translateY(-2px);
}

/* Enhanced Progress Bar */
.progress-enhanced {
  position: relative;
}

.progress-enhanced .progress-bar {
  height: 16px;
  background: var(--bg-elevated);
  border-radius: var(--radius-full);
  overflow: visible;
  position: relative;
}

.progress-enhanced .progress-fill {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  position: relative;
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-enhanced .progress-fill::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

.progress-enhanced .progress-thumb {
  position: absolute;
  right: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  border-radius: 50%;
  box-shadow: var(--shadow-accent);
  transition: transform 0.2s;
}

.progress-enhanced:hover .progress-thumb {
  transform: translateY(-50%) scale(1.2);
}

/* Interactive Lesson Cards */
.lesson-card-enhanced {
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.lesson-card-enhanced::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transition: transform 0.3s ease;
}

.lesson-card-enhanced:hover::before {
  transform: scaleY(1);
}

.lesson-card-enhanced:hover {
  transform: translateX(8px);
  border-color: var(--accent);
}

.lesson-card-enhanced:active {
  transform: translateX(4px) scale(0.99);
}

/* Achievement Card Enhanced */
.achievement-enhanced {
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.achievement-enhanced.unlocked {
  background: linear-gradient(135deg, rgba(255, 210, 63, 0.2), rgba(255, 107, 53, 0.1));
  border-color: var(--gold);
}

.achievement-enhanced.unlocked::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: var(--gradient-gold);
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s;
}

.achievement-enhanced.unlocked:hover::before {
  opacity: 0.5;
}

.achievement-enhanced:hover {
  transform: scale(1.15) rotate(5deg);
  z-index: 10;
}

.achievement-enhanced:active {
  transform: scale(1.1) rotate(0deg);
}

/* Streak Card Enhanced */
.streak-card-enhanced {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(255, 71, 87, 0.2), rgba(255, 107, 53, 0.15));
  border-color: var(--fire);
}

.streak-card-enhanced::before {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--fire-glow) 0%, transparent 50%);
  animation: float 4s ease-in-out infinite;
}

.streak-number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-fire);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 30px var(--fire-glow);
}

/* XP Card Enhanced */
.xp-card-enhanced {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(255, 210, 63, 0.2), rgba(255, 160, 0, 0.15));
  border-color: var(--gold);
}

.xp-card-enhanced::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--gold-glow) 0%, transparent 50%);
  animation: float 5s ease-in-out infinite reverse;
}

.xp-number {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Activity Calendar Enhanced */
.activity-calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}

.activity-cell {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.activity-cell:hover {
  transform: scale(1.2);
  z-index: 10;
}

.activity-cell.level-1 { background: rgba(0, 212, 170, 0.2); border-color: rgba(0, 212, 170, 0.3); }
.activity-cell.level-2 { background: rgba(0, 212, 170, 0.4); border-color: rgba(0, 212, 170, 0.5); }
.activity-cell.level-3 { background: rgba(0, 212, 170, 0.6); border-color: rgba(0, 212, 170, 0.7); }
.activity-cell.level-4 { background: var(--accent); border-color: var(--accent); }

.activity-cell.today {
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent);
}

/* Leaderboard Enhanced */
.leaderboard-enhanced .leaderboard-item {
  transition: all 0.3s ease;
  cursor: pointer;
}

.leaderboard-enhanced .leaderboard-item:hover {
  transform: translateX(8px);
  background: var(--bg-card-hover);
}

.leaderboard-enhanced .leaderboard-item.gold {
  border-left: 3px solid var(--gold);
}

.leaderboard-enhanced .leaderboard-item.silver {
  border-left: 3px solid #c0c0c0;
}

.leaderboard-enhanced .leaderboard-item.bronze {
  border-left: 3px solid #cd7f32;
}

/* Continue Learning Card Enhanced */
.continue-enhanced {
  position: relative;
  overflow: hidden;
}

.continue-enhanced::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.continue-enhanced:hover::before {
  transform: translateX(100%);
}

.continue-enhanced .play-icon {
  width: 60px;
  height: 60px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all 0.3s ease;
}

.continue-enhanced:hover .play-icon {
  transform: scale(1.1);
  background: rgba(0, 0, 0, 0.5);
}

/* Floating Action Button */
.fab {
  position: fixed;
  bottom: 100px;
  right: 20px;
  width: 56px;
  height: 56px;
  background: var(--gradient-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-accent);
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 100;
}

.fab:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 40px var(--accent-glow);
}

.fab:active {
  transform: scale(0.95);
}

@media (min-width: 768px) {
  .fab {
    bottom: 40px;
    right: 40px;
  }
}

/* Modal Backdrop */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 2000;
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 2001;
}

.modal-backdrop.active .modal-content {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  z-index: 3000;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
  pointer-events: auto;
  max-width: 350px;
}

.toast.success {
  border-color: var(--success);
  background: linear-gradient(90deg, rgba(0, 212, 170, 0.1), var(--bg-card));
}

.toast.xp {
  border-color: var(--gold);
  background: linear-gradient(90deg, rgba(255, 210, 63, 0.1), var(--bg-card));
}

@keyframes fadeOut {
  to { opacity: 0; transform: translateX(100px); }
}

/* Confetti Canvas */
.confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

/* Particles Background */
.particles-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.3;
  animation: float 10s infinite;
}

/* Smooth number transitions */
.number-animate {
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Scroll reveal animation */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* About Sambo section styles */
.about-sambo .badge {
  transition: all 0.3s ease;
}

.about-sambo .badge:hover {
  transform: scale(1.05);
}