/* ================================================================
   ENGLISH CLUB — Futuristic Cyber-Clean Design System
   ================================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ================================================================
   CSS Custom Properties — Dark Mode (Default)
   ================================================================ */
:root {
  /* Core palette */
  --bg-primary: #0A0A0C;
  --bg-secondary: #101014;
  --bg-card: #16161A;
  --bg-card-hover: #1C1C22;
  --bg-elevated: #1E1E24;
  --bg-input: #12121699;

  /* Accent */
  --accent: #FF0033;
  --accent-hover: #E63946;
  --accent-soft: rgba(255, 0, 51, 0.15);
  --accent-glow: rgba(255, 0, 51, 0.4);
  --accent-gradient: linear-gradient(135deg, #FF0033, #E63946);
  --accent-gradient-soft: linear-gradient(135deg, rgba(255, 0, 51, 0.2), rgba(230, 57, 70, 0.1));

  /* Text */
  --text-primary: #FFFFFF;
  --text-secondary: #A0A0B0;
  --text-muted: #6B6B7B;
  --text-inverse: #0A0A0C;

  /* Borders */
  --border-color: rgba(255, 255, 255, 0.06);
  --border-color-hover: rgba(255, 0, 51, 0.3);
  --border-accent: rgba(255, 0, 51, 0.5);

  /* Glass */
  --glass-bg: rgba(22, 22, 26, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: 20px;

  /* 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-glow: 0 0 20px rgba(255, 0, 51, 0.15);
  --shadow-glow-strong: 0 0 40px rgba(255, 0, 51, 0.3);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);

  /* Scrollbar */
  --scrollbar-track: #0A0A0C;
  --scrollbar-thumb: #2A2A35;
  --scrollbar-thumb-hover: #FF0033;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Spacing */
  --nav-height: 72px;
  --section-padding: 100px;
  --container-max: 1280px;
  --container-padding: 24px;
}

/* ================================================================
   Light Mode Overrides
   ================================================================ */
[data-theme="light"] {
  --bg-primary: #F5F5F7;
  --bg-secondary: #EDEDF0;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FAFAFA;
  --bg-elevated: #FFFFFF;
  --bg-input: rgba(240, 240, 245, 0.9);

  --accent: #CC0029;
  --accent-hover: #B80025;
  --accent-soft: rgba(204, 0, 41, 0.08);
  --accent-glow: rgba(204, 0, 41, 0.2);
  --accent-gradient: linear-gradient(135deg, #CC0029, #E63946);
  --accent-gradient-soft: linear-gradient(135deg, rgba(204, 0, 41, 0.08), rgba(230, 57, 70, 0.04));

  --text-primary: #1A1A2E;
  --text-secondary: #5A5A6E;
  --text-muted: #8A8A9E;
  --text-inverse: #FFFFFF;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(204, 0, 41, 0.25);
  --border-accent: rgba(204, 0, 41, 0.4);

  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(0, 0, 0, 0.06);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(204, 0, 41, 0.08);
  --shadow-glow-strong: 0 0 40px rgba(204, 0, 41, 0.15);
  --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.06);

  --scrollbar-track: #F5F5F7;
  --scrollbar-thumb: #CDCDD4;
  --scrollbar-thumb-hover: #CC0029;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-medium), color var(--transition-medium);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* Selection */
::selection {
  background: var(--accent);
  color: #fff;
}

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

ul, ol {
  list-style: none;
}

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

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

/* ================================================================
   Page Load Animation
   ================================================================ */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
.page-loader.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Page enter animation */
.page-enter {
  animation: pageEnter 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

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

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

.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-full);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.section-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ================================================================
   Navbar
   ================================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: all var(--transition-medium);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom-color: var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 3px;
  font-family: 'Orbitron', sans-serif;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-primary);
  text-decoration: none;
  transition: transform var(--transition-fast);
}
.nav-logo:hover {
  transform: scale(1.03);
}
.nav-logo .logo-accent {
  color: var(--accent);
}
.nav-logo .logo-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
  margin-left: 2px;
  box-shadow: 0 0 8px var(--accent-glow);
  animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--accent-glow); }
  50% { opacity: 0.5; box-shadow: 0 0 16px var(--accent-glow); }
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  position: relative;
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  letter-spacing: 0.3px;
}
.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--accent-soft);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast);
}
.nav-link:hover::after,
.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

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

/* Theme Toggle */
.theme-toggle {
  position: relative;
  width: 52px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  padding: 3px;
}
.theme-toggle:hover {
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-glow);
}
.theme-toggle-knob {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-gradient);
  transition: transform var(--transition-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(255, 0, 51, 0.3);
}
.theme-toggle-knob svg {
  width: 12px;
  height: 12px;
  fill: #fff;
}
[data-theme="light"] .theme-toggle-knob {
  transform: translateX(24px);
}

/* Mobile Menu Toggle */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  z-index: 1001;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}
.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ================================================================
   Hero Section
   ================================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: var(--nav-height);
  overflow: hidden;
}

/* Background grid pattern */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 0, 51, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 0, 51, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* Radial glow */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(255, 0, 51, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: 40px 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-full);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2.5px;
  margin-bottom: 32px;
  animation: badgeGlow 3s ease-in-out infinite;
}

@keyframes badgeGlow {
  0%, 100% { box-shadow: 0 0 0 rgba(255, 0, 51, 0); }
  50% { box-shadow: 0 0 20px rgba(255, 0, 51, 0.15); }
}

.hero-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}
.hero-title .title-line {
  display: block;
}
.hero-title .text-accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}
.hero-title .text-accent::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  opacity: 0.5;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
  position: relative;
}
.hero-stat::after {
  content: '';
  position: absolute;
  right: -24px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 40px;
  background: var(--border-color);
}
.hero-stat:last-child::after {
  display: none;
}
.stat-number {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent);
  display: block;
  line-height: 1.2;
}
.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 500;
  margin-top: 4px;
}

/* Hero CTA */
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ================================================================
   Buttons
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 0, 51, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 0, 51, 0.4);
}
.btn-primary:active {
  transform: translateY(0);
}

/* Shimmer effect on primary button */
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.6s ease;
}
.btn-primary:hover::before {
  left: 100%;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 10px 22px;
  font-size: 0.82rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-sm);
}

/* ================================================================
   Level Cards Grid
   ================================================================ */
.levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.level-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-medium);
  overflow: hidden;
  cursor: pointer;
}

/* Glassmorphism overlay */
.level-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, transparent 50%);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.level-card:hover {
  border-color: var(--border-color-hover);
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.level-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.level-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  font-family: 'Orbitron', sans-serif;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 0, 51, 0.3);
  flex-shrink: 0;
}

.level-status {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(255, 0, 51, 0.2);
}
.level-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: statusPulse 2s infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.level-card-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}
.level-card-label {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
}

.level-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

/* Content indicators */
.level-indicators {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 24px;
}
.level-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
.level-indicator svg {
  width: 14px;
  height: 14px;
  color: var(--accent);
  flex-shrink: 0;
}
.level-indicator span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.level-card-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(255, 0, 51, 0.2);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}
.level-card-btn:hover {
  background: var(--accent-gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(255, 0, 51, 0.3);
}
.level-card-btn svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}
.level-card-btn:hover svg {
  transform: translateX(4px);
}

/* ================================================================
   Resources Section
   ================================================================ */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.resource-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-medium);
  overflow: hidden;
  text-align: center;
}
.resource-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.resource-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-lg);
  color: var(--accent);
  transition: all var(--transition-medium);
}
.resource-card:hover .resource-icon {
  background: var(--accent-gradient);
  color: #fff;
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 4px 20px rgba(255, 0, 51, 0.3);
}
.resource-icon svg {
  width: 28px;
  height: 28px;
}

.resource-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.resource-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}
.resource-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--transition-fast);
}
.resource-link:hover {
  gap: 10px;
}

/* ================================================================
   Footer
   ================================================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .nav-logo {
  margin-bottom: 16px;
}
.footer-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 320px;
}

.footer-socials {
  display: flex;
  gap: 12px;
}
.social-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.social-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}
.social-btn svg {
  width: 18px;
  height: 18px;
}

.footer-heading {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-link:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copyright {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-legal {
  display: flex;
  gap: 24px;
}
.footer-legal a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}
.footer-legal a:hover {
  color: var(--accent);
}

/* ================================================================
   SCROLL ANIMATIONS
   ================================================================ */

/* Base state for all animated elements */
[data-animate] {
  opacity: 0;
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

/* Fade Up */
[data-animate="fade-up"] {
  transform: translateY(50px);
}
[data-animate="fade-up"].animated {
  opacity: 1;
  transform: translateY(0);
}

/* Fade Down */
[data-animate="fade-down"] {
  transform: translateY(-50px);
}
[data-animate="fade-down"].animated {
  opacity: 1;
  transform: translateY(0);
}

/* Fade Left */
[data-animate="fade-left"] {
  transform: translateX(-50px);
}
[data-animate="fade-left"].animated {
  opacity: 1;
  transform: translateX(0);
}

/* Fade Right */
[data-animate="fade-right"] {
  transform: translateX(50px);
}
[data-animate="fade-right"].animated {
  opacity: 1;
  transform: translateX(0);
}

/* Scale Up */
[data-animate="scale-up"] {
  transform: scale(0.85);
}
[data-animate="scale-up"].animated {
  opacity: 1;
  transform: scale(1);
}

/* Zoom In */
[data-animate="zoom-in"] {
  transform: scale(0.9);
}
[data-animate="zoom-in"].animated {
  opacity: 1;
  transform: scale(1);
}

/* Flip In */
[data-animate="flip-up"] {
  transform: perspective(800px) rotateX(15deg) translateY(30px);
}
[data-animate="flip-up"].animated {
  opacity: 1;
  transform: perspective(800px) rotateX(0) translateY(0);
}

/* Blur In */
[data-animate="blur-in"] {
  filter: blur(10px);
  transform: translateY(20px);
}
[data-animate="blur-in"].animated {
  opacity: 1;
  filter: blur(0);
  transform: translateY(0);
  transition: opacity 0.7s ease, transform 0.7s ease, filter 0.7s ease;
}

/* Staggered delay for grid children */
[data-animate-stagger] > *:nth-child(1) { transition-delay: 0.05s; }
[data-animate-stagger] > *:nth-child(2) { transition-delay: 0.1s; }
[data-animate-stagger] > *:nth-child(3) { transition-delay: 0.15s; }
[data-animate-stagger] > *:nth-child(4) { transition-delay: 0.2s; }
[data-animate-stagger] > *:nth-child(5) { transition-delay: 0.25s; }
[data-animate-stagger] > *:nth-child(6) { transition-delay: 0.3s; }
[data-animate-stagger] > *:nth-child(7) { transition-delay: 0.35s; }
[data-animate-stagger] > *:nth-child(8) { transition-delay: 0.4s; }

/* ================================================================
   LEVEL PAGE STYLES
   ================================================================ */

/* Level Banner */
.level-banner {
  padding: calc(var(--nav-height) + 48px) 0 48px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}
.level-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 0, 51, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 0, 51, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}
.level-banner::after {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 0, 51, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

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

.level-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
  transition: all var(--transition-fast);
}
.level-back-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}
.level-back-btn svg {
  width: 16px;
  height: 16px;
}

.level-banner-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.level-banner-badge {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  font-weight: 900;
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 0, 51, 0.3);
}

.level-banner-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
}
.level-banner-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Progress bar */
.level-progress {
  margin-top: 12px;
}
.level-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.level-progress-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.level-progress-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
}
.level-progress-bar {
  height: 6px;
  background: var(--bg-card);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.level-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  box-shadow: 0 0 12px rgba(255, 0, 51, 0.4);
}

/* Tabs */
.level-tabs {
  padding: 40px 0;
}

.tabs-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 4px;
  border: 1px solid var(--border-color);
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.tabs-nav::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  flex: 1;
  min-width: max-content;
  padding: 12px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
}
.tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-primary);
}
.tab-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 2px 12px rgba(255, 0, 51, 0.3);
}
.tab-btn svg {
  width: 16px;
  height: 16px;
}

.tab-panel {
  display: none;
  animation: tabFadeIn 0.4s ease;
}
.tab-panel.active {
  display: block;
}

@keyframes tabFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Audio Panel */
.audio-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.audio-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.audio-item:hover {
  border-color: var(--border-color-hover);
  background: var(--bg-card-hover);
}

.audio-play-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: 50%;
  color: #fff;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 12px rgba(255, 0, 51, 0.3);
}
.audio-play-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 20px rgba(255, 0, 51, 0.4);
}
.audio-play-btn svg {
  width: 18px;
  height: 18px;
}

.audio-info {
  flex: 1;
}
.audio-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.audio-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.audio-waveform {
  flex: 1;
  max-width: 200px;
  height: 32px;
  display: flex;
  align-items: center;
  gap: 2px;
}
.audio-waveform-bar {
  flex: 1;
  background: var(--border-color);
  border-radius: 2px;
  min-height: 4px;
  transition: background var(--transition-fast);
}
.audio-item.playing .audio-waveform-bar {
  background: var(--accent);
  animation: waveAnimate 0.8s ease-in-out infinite alternate;
}
.audio-waveform-bar:nth-child(1) { height: 30%; animation-delay: 0s; }
.audio-waveform-bar:nth-child(2) { height: 60%; animation-delay: 0.1s; }
.audio-waveform-bar:nth-child(3) { height: 90%; animation-delay: 0.2s; }
.audio-waveform-bar:nth-child(4) { height: 45%; animation-delay: 0.3s; }
.audio-waveform-bar:nth-child(5) { height: 75%; animation-delay: 0.15s; }
.audio-waveform-bar:nth-child(6) { height: 50%; animation-delay: 0.25s; }
.audio-waveform-bar:nth-child(7) { height: 85%; animation-delay: 0.05s; }
.audio-waveform-bar:nth-child(8) { height: 35%; animation-delay: 0.35s; }

@keyframes waveAnimate {
  from { transform: scaleY(0.5); }
  to { transform: scaleY(1.3); }
}

.audio-duration {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* Vocabulary / Flashcards */
.vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.flashcard {
  perspective: 1000px;
  height: 200px;
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

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

.flashcard-front,
.flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px solid var(--border-color);
}

.flashcard-front {
  background: var(--bg-card);
}

.flashcard-back {
  background: var(--bg-elevated);
  transform: rotateY(180deg);
  border-color: var(--border-accent);
}

.flashcard-word {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.flashcard-phonetic {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.flashcard-type {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  padding: 4px 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
}

.flashcard-translation {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.flashcard-example {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.5;
}

.flashcard-audio-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: 50%;
  color: var(--accent);
  transition: all var(--transition-fast);
}
.flashcard-audio-btn:hover {
  background: var(--accent);
  color: #fff;
}
.flashcard-audio-btn svg {
  width: 14px;
  height: 14px;
}

/* Reading Section */
.reading-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.reading-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.reading-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 12px;
}
.reading-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.reading-difficulty {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(255, 0, 51, 0.2);
}

.reading-body {
  padding: 24px;
}
.reading-text {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.reading-text .highlight {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border-bottom: 2px solid rgba(255, 0, 51, 0.3);
}
.reading-text .highlight:hover {
  background: var(--accent);
  color: #fff;
}

.translation-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: 12px;
}
.translation-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.translation-toggle svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}
.translation-toggle.active svg {
  transform: rotate(180deg);
}
.translation-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-medium);
}
.translation-content.visible {
  max-height: 500px;
}
.translation-text {
  padding: 16px;
  background: var(--accent-soft);
  border: 1px solid rgba(255, 0, 51, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-style: italic;
}

.key-phrases {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}
.key-phrases-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.key-phrase {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
}
.key-phrase-en {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.88rem;
  min-width: 140px;
}
.key-phrase-es {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* Quiz / Exercises */
.quiz-container {
  max-width: 700px;
  margin: 0 auto;
}

.quiz-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
}
.quiz-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-card);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.quiz-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-medium);
}
.quiz-progress-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.quiz-question {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
}

.quiz-question-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  font-weight: 600;
}
.quiz-question-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
  line-height: 1.5;
}

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

.quiz-option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.92rem;
  color: var(--text-primary);
}
.quiz-option:hover {
  border-color: var(--border-color-hover);
  background: var(--bg-card-hover);
}

.quiz-option-letter {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.quiz-option.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.quiz-option.selected .quiz-option-letter {
  background: var(--accent-gradient);
  color: #fff;
  border-color: transparent;
}

.quiz-option.correct {
  border-color: #00D26A;
  background: rgba(0, 210, 106, 0.08);
}
.quiz-option.correct .quiz-option-letter {
  background: linear-gradient(135deg, #00D26A, #00B85C);
  color: #fff;
  border-color: transparent;
}

.quiz-option.incorrect {
  border-color: #FF4757;
  background: rgba(255, 71, 87, 0.08);
}
.quiz-option.incorrect .quiz-option-letter {
  background: linear-gradient(135deg, #FF4757, #FF2D40);
  color: #fff;
  border-color: transparent;
}

.quiz-option.disabled {
  pointer-events: none;
  opacity: 0.6;
}

.quiz-feedback {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  margin-top: 16px;
  display: none;
  align-items: center;
  gap: 10px;
  animation: tabFadeIn 0.3s ease;
}
.quiz-feedback.show {
  display: flex;
}
.quiz-feedback.correct {
  background: rgba(0, 210, 106, 0.08);
  border: 1px solid rgba(0, 210, 106, 0.3);
  color: #00D26A;
}
.quiz-feedback.incorrect {
  background: rgba(255, 71, 87, 0.08);
  border: 1px solid rgba(255, 71, 87, 0.3);
  color: #FF4757;
}

.quiz-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.quiz-score {
  text-align: center;
  padding: 48px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}
.quiz-score-number {
  font-family: 'Orbitron', sans-serif;
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 8px;
}
.quiz-score-label {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ================================================================
   Particle Background (optional enhancement)
   ================================================================ */
.particles-container {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.3;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% {
    transform: translateY(100vh) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 0.3;
  }
  90% {
    opacity: 0.3;
  }
  100% {
    transform: translateY(-10vh) rotate(720deg);
    opacity: 0;
  }
}

/* ================================================================
   Responsive Design
   ================================================================ */
@media (max-width: 1024px) {
  .levels-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 64px;
    --container-padding: 20px;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-card);
    border-left: 1px solid var(--border-color);
    flex-direction: column;
    padding: 100px 32px 40px;
    gap: 4px;
    transition: right var(--transition-medium);
    z-index: 999;
  }
  .nav-menu.open {
    right: 0;
  }
  .nav-menu::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-medium);
    pointer-events: none;
  }
  .nav-menu.open::before {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    padding: 12px 16px;
    font-size: 1rem;
    width: 100%;
  }

  .nav-hamburger {
    display: flex;
  }

  .hero-stats {
    gap: 24px;
  }
  .hero-stat::after {
    display: none;
  }

  .levels-grid {
    grid-template-columns: 1fr;
  }

  .resources-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .tabs-nav {
    flex-wrap: nowrap;
  }
  .tab-btn {
    flex: 0 0 auto;
    padding: 10px 16px;
    font-size: 0.8rem;
  }

  .audio-waveform {
    display: none;
  }

  .vocab-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .resources-grid {
    grid-template-columns: 1fr;
  }

  .level-indicators {
    grid-template-columns: 1fr;
  }

  .vocab-grid {
    grid-template-columns: 1fr;
  }
}

/* ================================================================
   Utility Classes
   ================================================================ */
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.font-mono { font-family: 'JetBrains Mono', monospace; }
.font-display { font-family: 'Orbitron', sans-serif; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}