/* ============================================
   AI Language Tutor Landing Page
   Modern Dark Theme with Glassmorphism
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-accent: #06b6d4;
  --color-accent-light: #22d3ee;
  --color-secondary: #ec4899;

  /* Background */
  --bg-dark: #0f0f23;
  --bg-darker: #0a0a1a;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(255, 255, 255, 0.03);

  /* Text */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1, #06b6d4);
  --gradient-secondary: linear-gradient(135deg, #ec4899, #6366f1);
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15), transparent 70%);

  /* Spacing */
  --section-padding: 120px;
  --container-width: 1200px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* Shadows */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
  --shadow-glow-accent: 0 0 40px rgba(6, 182, 212, 0.3);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

/* ---------- Typography ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
  color: var(--text-secondary);
}

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

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

mark {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(6, 182, 212, 0.3));
  color: var(--text-primary);
  padding: 0.1em 0.3em;
  border-radius: 4px;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

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

.section-header p {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.btn-icon {
  font-size: 1.25rem;
}

/* ---------- Cards ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---------- Glass Effect ---------- */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(15, 15, 35, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  padding: 12px 0;
  background: rgba(15, 15, 35, 0.95);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.nav-logo-img {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  animation: logoBreathe 4s ease-in-out infinite;
}

/* Breathing Animation for Logo and Speech Bubbles */
@keyframes logoBreathe {

  0%,
  100% {
    transform: scale(1);
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.3));
  }

  50% {
    transform: scale(1.05);
    filter: drop-shadow(0 0 16px rgba(99, 102, 241, 0.5));
  }
}

@keyframes bubbleBreathe {

  0%,
  100% {
    transform: scale(1) translateY(0);
    opacity: 0.9;
  }

  25% {
    transform: scale(1.02) translateY(-2px);
    opacity: 1;
  }

  50% {
    transform: scale(1.04) translateY(-4px);
    opacity: 1;
  }

  75% {
    transform: scale(1.02) translateY(-2px);
    opacity: 1;
  }
}

@keyframes bubbleFloat {

  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }

  25% {
    transform: translateY(-5px) rotate(1deg);
  }

  50% {
    transform: translateY(-8px) rotate(-1deg);
  }

  75% {
    transform: translateY(-3px) rotate(0.5deg);
  }
}

@keyframes bubbleConnect {

  0%,
  100% {
    transform: translateX(0) scale(1);
  }

  50% {
    transform: translateX(3px) scale(1.02);
  }
}

/* Chat Avatar Logo Image */
.chat-avatar-img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  animation: logoBreathe 4s ease-in-out infinite;
}

.bot-avatar-img {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 50%;
  object-fit: cover;
  animation: logoBreathe 4s ease-in-out infinite;
  animation-delay: 0.5s;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switcher {
  display: flex;
  gap: 8px;
}

.lang-btn {
  padding: 6px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover,
.lang-btn.active {
  background: var(--bg-card);
  border-color: var(--color-primary);
  color: var(--text-primary);
}

.nav-cta {
  padding: 10px 20px;
  font-size: 0.875rem;
}

/* Mobile menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 100%;
  background: var(--gradient-glow);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.hero h1 {
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 500px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 64px;
}

.hero-stat {
  text-align: left;
}

.hero-stat-value {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Hero Visual */
.hero-visual {
  position: relative;
  z-index: 1;
}

.hero-phone {
  position: relative;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.phone-frame {
  background: linear-gradient(145deg, #1a1a2e, #16162a);
  border-radius: 40px;
  padding: 12px;
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.phone-screen {
  background: #1e1e30;
  border-radius: 32px;
  overflow: hidden;
  aspect-ratio: 9/16;
  display: flex;
  flex-direction: column;
}

.phone-header {
  padding: 16px 20px;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  gap: 12px;
}

.phone-avatar {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  display: none;
  /* Hide default emoji avatar container */
}

.phone-avatar-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  animation: logoBreathe 4s ease-in-out infinite;
}

.phone-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.phone-messages {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.phone-message {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 0.875rem;
  animation: messageSlide 0.5s ease-out forwards;
  opacity: 0;
}

.phone-message.bot {
  background: var(--bg-card);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.phone-message.user {
  background: var(--gradient-primary);
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.phone-message:nth-child(1) {
  animation-delay: 0.2s;
}

.phone-message:nth-child(2) {
  animation-delay: 0.5s;
}

.phone-message:nth-child(3) {
  animation-delay: 0.8s;
}

.phone-message:nth-child(4) {
  animation-delay: 1.1s;
}

/* Floating elements around phone */
.floating-card {
  position: absolute;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.85rem;
  box-shadow: var(--shadow-card);
  animation: float 6s ease-in-out infinite;
}

.floating-card.card-1 {
  top: 10%;
  left: -20%;
  animation-delay: 0s;
}

.floating-card.card-2 {
  top: 40%;
  right: -15%;
  animation-delay: 2s;
}

.floating-card.card-3 {
  bottom: 15%;
  left: -15%;
  animation-delay: 4s;
}

.floating-card-icon {
  margin-right: 8px;
}

/* ---------- Problem Section ---------- */
.problem {
  background: var(--bg-darker);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.problem-card {
  text-align: center;
  padding: 48px 32px;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.problem-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #ef4444, #f97316);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.problem-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(239, 68, 68, 0.1), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.problem-card:hover {
  transform: translateY(-8px);
  border-color: rgba(239, 68, 68, 0.3);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 60px rgba(239, 68, 68, 0.1);
}

.problem-card:hover::before {
  transform: scaleX(1);
}

.problem-card:hover::after {
  opacity: 1;
}

.problem-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  position: relative;
  transition: all var(--transition-normal);
}

.problem-icon::before {
  content: '';
  position: absolute;
  inset: -10px;
  background: radial-gradient(circle, rgba(239, 68, 68, 0.3), transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.problem-card:hover .problem-icon {
  transform: scale(1.1);
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
}

.problem-card:hover .problem-icon::before {
  opacity: 1;
}

.problem-card h3 {
  margin-bottom: 16px;
  transition: color var(--transition-fast);
}

.problem-card:hover h3 {
  color: #f87171;
}

/* ---------- Solution Section ---------- */
.solution {
  position: relative;
  overflow: hidden;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.solution-card {
  text-align: center;
  padding: 48px 32px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-normal);
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* Animated gradient border on hover */
.solution-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.solution-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(99, 102, 241, 0.15), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.solution-card:hover {
  transform: translateY(-8px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 60px rgba(99, 102, 241, 0.15);
}

.solution-card:hover::before {
  transform: scaleX(1);
}

.solution-card:hover::after {
  opacity: 1;
}

.solution-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  position: relative;
  transition: all var(--transition-normal);
}

/* Pulsing glow behind icon on hover */
.solution-icon::before {
  content: '';
  position: absolute;
  inset: -10px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4), transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-normal);
  animation: pulseGlow 2s ease-in-out infinite;
  pointer-events: none;
}

.solution-card:hover .solution-icon {
  transform: scale(1.1);
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.4);
}

.solution-card:hover .solution-icon::before {
  opacity: 1;
}

/* Staggered animation for cards */
.solution-card.reveal {
  opacity: 0;
  transform: translateY(30px);
}

.solution-card.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.solution-card:nth-child(1).reveal.visible {
  transition-delay: 0.1s;
}

.solution-card:nth-child(2).reveal.visible {
  transition-delay: 0.2s;
}

.solution-card:nth-child(3).reveal.visible {
  transition-delay: 0.3s;
}

/* Card title hover effect */
.solution-card h3 {
  transition: color var(--transition-fast);
}

.solution-card:hover h3 {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- How It Works Section ---------- */
.how-it-works {
  background: var(--bg-darker);
}

.timeline {
  display: flex;
  justify-content: space-between;
  position: relative;
  padding: 48px 0;
}



.timeline-step {
  flex: 1;
  text-align: center;
  position: relative;
  z-index: 1;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease-out;
  cursor: pointer;
  padding: 16px 8px;
  border-radius: var(--radius-md);
}

.timeline-step::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center top, rgba(99, 102, 241, 0.15), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  border-radius: var(--radius-md);
  pointer-events: none;
}

.timeline-step:hover::before {
  opacity: 1;
}

.timeline-step:hover {
  background: rgba(99, 102, 241, 0.05);
}

.timeline-step.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-step:nth-child(1) {
  transition-delay: 0.1s;
}

.timeline-step:nth-child(2) {
  transition-delay: 0.2s;
}

.timeline-step:nth-child(3) {
  transition-delay: 0.3s;
}

.timeline-step:nth-child(4) {
  transition-delay: 0.4s;
}

.timeline-step:nth-child(5) {
  transition-delay: 0.5s;
}

.timeline-step:nth-child(6) {
  transition-delay: 0.6s;
}

.timeline-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--bg-dark);
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all var(--transition-normal);
  position: relative;
}

.timeline-icon::after {
  content: '';
  position: absolute;
  inset: -12px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4), transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-normal);
  animation: pulseGlow 2s ease-in-out infinite;
  pointer-events: none;
}

.timeline-step:hover .timeline-icon {
  background: var(--gradient-primary);
  transform: scale(1.15);
  box-shadow: var(--shadow-glow);
}

.timeline-step:hover .timeline-icon::after {
  opacity: 1;
}

.timeline-title {
  font-size: 1rem;
  margin-bottom: 8px;
  transition: all var(--transition-fast);
}

.timeline-step:hover .timeline-title {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.timeline-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 140px;
  margin: 0 auto;
}

/* ---------- Features Section ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px;
  text-align: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.feature-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(99, 102, 241, 0.12), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.25);
  box-shadow:
    0 16px 32px rgba(0, 0, 0, 0.25),
    0 0 40px rgba(99, 102, 241, 0.1);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card:hover::after {
  opacity: 1;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  display: block;
  transition: transform var(--transition-normal);
  position: relative;
}

.feature-icon::after {
  content: '';
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25), transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: -1;
}

.feature-card:hover .feature-icon {
  transform: scale(1.15);
}

.feature-card:hover .feature-icon::after {
  opacity: 1;
}

.feature-card h3 {
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.feature-card:hover h3 {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Examples Section - Animated Grid ---------- */
.examples {
  background: var(--bg-darker);
  padding: 80px 0;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

/* Base Animation Card */
.example-anim-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  height: 340px;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}

.example-anim-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 20px rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.3);
}

/* Card Header */
.anim-card-header {
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  background: rgba(255, 255, 255, 0.02);
}

.anim-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.anim-icon {
  font-size: 1.2rem;
}

.anim-title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.anim-badge {
  font-size: 0.75rem;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  color: var(--text-secondary);
  font-weight: 600;
}

/* Card Content Area */
.anim-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* --- 1. Story Animation --- */
.story-anim-text {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.typing-line {
  opacity: 0;
  transform: translateY(10px);
  animation: typeFadeIn 0.5s forwards;
}

.typing-line.delay-1 {
  animation-delay: 1s;
}

.typing-line.delay-2 {
  animation-delay: 2.5s;
}

mark {
  background: transparent;
  color: var(--color-accent);
  text-shadow: 0 0 10px rgba(99, 102, 241, 0.3);
  padding: 0;
}

.anim-controls {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.anim-play-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.anim-play-btn::before {
  content: '▶';
  color: white;
  font-size: 0.8rem;
  margin-left: 2px;
}

.anim-waveform {
  display: flex;
  gap: 3px;
  align-items: center;
  height: 20px;
}

.anim-waveform span {
  width: 3px;
  background: var(--text-muted);
  border-radius: 2px;
  height: 100%;
  animation: wave 1.2s infinite ease-in-out;
}

.anim-waveform span:nth-child(2) {
  animation-delay: 0.2s;
}

.anim-waveform span:nth-child(3) {
  animation-delay: 0.4s;
}

.anim-waveform span:nth-child(4) {
  animation-delay: 0.6s;
}

/* --- 2. News Animation --- */
.news-anim-category {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: #a78bfa;
  margin-bottom: 8px;
  opacity: 0;
  animation: slideInLeft 0.5s 0.2s forwards;
}

.news-anim-headline {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  opacity: 0;
  animation: slideInLeft 0.6s 0.4s forwards;
}

.news-anim-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.fade-line {
  opacity: 0;
  animation: fadeIn 0.8s forwards;
}

.fade-line.delay-1 {
  animation-delay: 1.2s;
}

.fade-line.delay-2 {
  animation-delay: 2.0s;
}

/* --- 3. Lesson Animation --- */
.lesson-anim-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.lesson-anim-formula {
  background: rgba(255, 255, 255, 0.05);
  padding: 8px 12px;
  border-radius: 8px;
  font-family: monospace;
  color: var(--color-accent);
  margin-bottom: 20px;
  display: inline-block;
}

.lesson-check-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  opacity: 0;
  transform: translateX(-10px);
  animation: slideInCheck 0.5s forwards;
}

.lesson-check-row.delay-1 {
  animation-delay: 1.5s;
}

.check-icon {
  color: #10b981;
  font-weight: bold;
  transform: scale(0);
  animation: popIn 0.4s 0.5s forwards;
}

.lesson-check-row.delay-1 .check-icon {
  animation-delay: 2.0s;
}

/* --- 4. Word Card Animation --- */
.word-anim-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 20px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
  animation: cardFlip 6s infinite;
}

.word-anim-front,
.word-anim-back {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  backface-visibility: hidden;
  position: absolute;
}

.word-anim-back {
  transform: rotateY(180deg);
}

.word-anim-term {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.word-anim-pron {
  font-family: monospace;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.word-anim-def {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 500;
}

.word-anim-context {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 4px;
}

/* Animations Variables */
@keyframes typeFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

@keyframes slideInCheck {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes popIn {
  to {
    transform: scale(1);
  }
}

@keyframes wave {

  0%,
  100% {
    height: 6px;
  }

  50% {
    height: 16px;
  }
}

@keyframes cardFlip {

  0%,
  45% {
    transform: rotateY(0);
  }

  50%,
  95% {
    transform: rotateY(180deg);
  }

  100% {
    transform: rotateY(0);
  }
}

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



/* ---------- Demo Section ---------- */
.demo {
  position: relative;
  overflow: hidden;
}

.demo::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200%;
  height: 200%;
  background: var(--gradient-glow);
  pointer-events: none;
}

.demo-container {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.demo-input-wrapper {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
}

.demo-input {
  flex: 1;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: all var(--transition-fast);
}

.demo-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.demo-input::placeholder {
  color: var(--text-muted);
}

.demo-btn {
  padding: 20px 32px;
  white-space: nowrap;
}

.demo-result {
  display: none;
  animation: fadeIn 0.5s ease;
}

.demo-result.visible {
  display: block;
}

.demo-story {
  padding: 32px;
  margin-bottom: 32px;
}

.demo-story-title {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.demo-story-text {
  font-size: 1.1rem;
  line-height: 1.8;
}

.demo-words-title {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.demo-words {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.demo-word-card {
  flex: 1;
  min-width: 150px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.demo-word-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(99, 102, 241, 0.12), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.demo-word-card:hover {
  transform: translateY(-4px) scale(1.02);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
}

.demo-word-card:hover::after {
  opacity: 1;
}

.demo-word {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-accent);
  transition: all var(--transition-fast);
}

.demo-word-card:hover .demo-word {
  transform: scale(1.05);
}

.demo-translation {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.demo-cta {
  text-align: center;
}

/* ---------- Audience Section ---------- */
.audience {
  background: var(--bg-darker);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.audience-card {
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.audience-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #06b6d4, #8b5cf6);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.audience-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(6, 182, 212, 0.1), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.audience-card:hover {
  transform: translateY(-6px);
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow:
    0 16px 32px rgba(0, 0, 0, 0.25),
    0 0 40px rgba(6, 182, 212, 0.1);
}

.audience-card:hover::before {
  transform: scaleX(1);
}

.audience-card:hover::after {
  opacity: 1;
}

.audience-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  display: block;
  transition: transform var(--transition-normal);
  position: relative;
}

.audience-icon::after {
  content: '';
  position: absolute;
  inset: -15px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.25), transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: -1;
}

.audience-card:hover .audience-icon {
  transform: scale(1.15);
}

.audience-card:hover .audience-icon::after {
  opacity: 1;
}

.audience-card h3 {
  transition: color var(--transition-fast);
}

.audience-card:hover h3 {
  color: #22d3ee;
}

/* ---------- Why It Works Section ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.why-card {
  padding: 40px;
  display: flex;
  gap: 24px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.why-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  transform: scaleY(0);
  transition: transform var(--transition-normal);
}

.why-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.08), transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.why-card:hover {
  transform: translateX(8px);
  border-color: rgba(99, 102, 241, 0.25);
  box-shadow:
    0 16px 32px rgba(0, 0, 0, 0.25),
    0 0 40px rgba(99, 102, 241, 0.1);
}

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

.why-card:hover::after {
  opacity: 1;
}

.why-number {
  width: 48px;
  height: 48px;
  min-width: 48px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  transition: all var(--transition-normal);
  position: relative;
}

.why-number::after {
  content: '';
  position: absolute;
  inset: -8px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4), transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-normal);
  animation: pulseGlow 2s ease-in-out infinite;
}

.why-card:hover .why-number {
  transform: scale(1.1);
  box-shadow: var(--shadow-glow);
}

.why-card:hover .why-number::after {
  opacity: 1;
}

.why-content h3 {
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.why-card:hover .why-content h3 {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Footer ---------- */
.footer-cta {
  text-align: center;
  padding: 100px 0;
  background: linear-gradient(180deg, var(--bg-dark), var(--bg-darker));
  position: relative;
}

.footer-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 100%;
  background: var(--gradient-glow);
  pointer-events: none;
}

.footer-cta .container {
  position: relative;
  z-index: 1;
}

.footer-cta h2 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin-bottom: 16px;
}

.footer-cta p {
  font-size: 1.25rem;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.footer-cta .btn {
  font-size: 1.125rem;
  padding: 20px 48px;
}

.footer-bottom {
  background: var(--bg-darker);
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ---------- Animations ---------- */
@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes messageSlide {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes glow {

  0%,
  100% {
    box-shadow: var(--shadow-glow);
  }

  50% {
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.5);
  }
}

/* Scroll animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    order: 1;
  }

  .hero-visual {
    order: 0;
    margin-bottom: 40px;
  }

  .hero-phone {
    max-width: 280px;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .floating-card {
    display: none;
  }

  .problem-grid,
  .solution-grid,
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .timeline {
    flex-wrap: wrap;
    gap: 32px;
  }

  .timeline::before {
    display: none;
  }

  .timeline-step {
    flex: 0 0 calc(33.333% - 22px);
    opacity: 1;
    transform: none;
  }

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

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

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

  .nav-toggle {
    display: flex;
  }

  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-darker);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .problem-grid,
  .solution-grid,
  .features-grid,
  .audience-grid {
    grid-template-columns: 1fr;
  }

  .timeline-step {
    flex: 0 0 calc(50% - 16px);
  }

  .demo-input-wrapper {
    flex-direction: column;
  }

  .examples-tabs {
    flex-wrap: wrap;
  }

  .why-card {
    flex-direction: column;
    text-align: center;
  }

  .why-number {
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    flex-direction: column;
    gap: 24px;
  }

  .hero-stat {
    text-align: center;
  }

  .timeline-step {
    flex: 0 0 100%;
  }

  .lang-switcher {
    display: flex;
    gap: 4px;
  }

  .lang-btn {
    padding: 4px 8px;
    font-size: 0.75rem;
  }

  .nav-actions {
    gap: 8px;
  }

  .nav-cta {
    display: none;
    /* Hide Start button on very small screens to save space */
  }
}

/* ============================================
   Modes Showcase Section
   ============================================ */

.modes-showcase {
  background: var(--bg-darker);
  overflow: hidden;
}

.modes-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}

.mode-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

/* Mode Phone */
.mode-phone {
  position: relative;
  width: 100%;
  max-width: 200px;
}

.mode-phone-frame {
  background: linear-gradient(145deg, #1a1a2e, #16162a);
  border-radius: 24px;
  padding: 8px;
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(255, 255, 255, 0.05);
  position: relative;
  z-index: 2;
}

.mode-phone-notch {
  width: 60px;
  height: 6px;
  background: #0a0a1a;
  border-radius: 10px;
  margin: 8px auto 4px;
}

.mode-phone-screen {
  background: #1e1e30;
  border-radius: 18px;
  overflow: hidden;
  aspect-ratio: 9/16;
  display: flex;
  flex-direction: column;
}

.mode-screen-header {
  padding: 10px 12px;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mode-header-avatar {
  width: 32px;
  height: 32px;
  min-width: 32px;
  min-height: 32px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
}

.mode-header-info {
  flex: 1;
}

.mode-header-title {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-primary);
}

.mode-header-level {
  font-size: 0.6rem;
  color: var(--color-accent);
}

.mode-screen-content {
  flex: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Mode Glow Effects */
.mode-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 150%;
  height: 150%;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.3;
  z-index: 1;
  animation: pulseGlow 4s ease-in-out infinite;
}

.mode-glow-purple {
  background: radial-gradient(circle, #6366f1, transparent);
}

.mode-glow-cyan {
  background: radial-gradient(circle, #06b6d4, transparent);
}

.mode-glow-pink {
  background: radial-gradient(circle, #ec4899, transparent);
}

.mode-glow-green {
  background: radial-gradient(circle, #22c55e, transparent);
}

.mode-glow-orange {
  background: radial-gradient(circle, #f97316, transparent);
}

@keyframes pulseGlow {

  0%,
  100% {
    opacity: 0.2;
    transform: translate(-50%, -50%) scale(1);
  }

  50% {
    opacity: 0.4;
    transform: translate(-50%, -50%) scale(1.1);
  }
}

/* Mode Info */
.mode-info {
  text-align: center;
}

.mode-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
  line-height: 1;
}

.mode-info h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.mode-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Story Mode Content */
.story-content {
  gap: 12px;
}

.story-text {
  font-size: 0.65rem;
  line-height: 1.5;
  color: var(--text-secondary);
  flex: 1;
}

.story-words {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.story-word {
  padding: 4px 8px;
  background: var(--gradient-primary);
  border-radius: 100px;
  font-size: 0.55rem;
  font-weight: 600;
}

/* Audio Mode Content */
.audio-content {
  justify-content: center;
  align-items: center;
  gap: 16px;
}

.audio-visualizer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  height: 60px;
}

.audio-wave {
  width: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
  animation: audioWave 1s ease-in-out infinite;
}

.audio-wave:nth-child(1) {
  height: 20px;
  animation-delay: 0s;
}

.audio-wave:nth-child(2) {
  height: 35px;
  animation-delay: 0.1s;
}

.audio-wave:nth-child(3) {
  height: 25px;
  animation-delay: 0.2s;
}

.audio-wave:nth-child(4) {
  height: 45px;
  animation-delay: 0.3s;
}

.audio-wave:nth-child(5) {
  height: 30px;
  animation-delay: 0.4s;
}

.audio-wave:nth-child(6) {
  height: 50px;
  animation-delay: 0.5s;
}

.audio-wave:nth-child(7) {
  height: 35px;
  animation-delay: 0.6s;
}

.audio-wave:nth-child(8) {
  height: 40px;
  animation-delay: 0.7s;
}

.audio-wave:nth-child(9) {
  height: 25px;
  animation-delay: 0.8s;
}

.audio-wave:nth-child(10) {
  height: 45px;
  animation-delay: 0.9s;
}

.audio-wave:nth-child(11) {
  height: 30px;
  animation-delay: 1s;
}

.audio-wave:nth-child(12) {
  height: 20px;
  animation-delay: 1.1s;
}

@keyframes audioWave {

  0%,
  100% {
    transform: scaleY(0.5);
    opacity: 0.5;
  }

  50% {
    transform: scaleY(1);
    opacity: 1;
  }
}

.audio-text {
  font-size: 0.6rem;
  color: var(--text-secondary);
  text-align: center;
  font-style: italic;
}

.audio-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.audio-btn {
  width: 32px;
  height: 32px;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.audio-btn.audio-play {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border: none;
}

.audio-progress {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
}

.audio-progress-bar {
  width: 35%;
  height: 100%;
  background: var(--gradient-primary);
  animation: progressMove 3s linear infinite;
}

@keyframes progressMove {
  0% {
    width: 0%;
  }

  100% {
    width: 100%;
  }
}

/* Word Card Mode Content */
.wordcard-content {
  justify-content: space-between;
}

.wordcard-flip-container {
  flex: 1;
  perspective: 1000px;
}

.wordcard-flipper {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 120px;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  animation: flipCard 4s ease-in-out infinite;
}

@keyframes flipCard {

  0%,
  40% {
    transform: rotateY(0deg);
  }

  50%,
  90% {
    transform: rotateY(180deg);
  }

  100% {
    transform: rotateY(360deg);
  }
}

.wordcard-front,
.wordcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 12px;
}

.wordcard-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(236, 72, 153, 0.2));
}

.wordcard-word {
  font-size: 1rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.wordcard-transcription {
  font-size: 0.55rem;
  color: var(--text-muted);
  font-family: monospace;
  margin-top: 4px;
}

.wordcard-hint {
  font-size: 0.5rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.wordcard-translation {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.wordcard-example {
  font-size: 0.5rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 8px;
  text-align: center;
}

.wordcard-buttons {
  display: flex;
  gap: 6px;
}

.wordcard-btn {
  flex: 1;
  padding: 6px 4px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.wordcard-again {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

.wordcard-good {
  background: rgba(34, 197, 94, 0.2);
  color: #22c55e;
}

.wordcard-easy {
  background: rgba(6, 182, 212, 0.2);
  color: #06b6d4;
}

/* Lesson Mode Content */
.lesson-content {
  gap: 10px;
}

.lesson-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
}

.lesson-rule {
  text-align: center;
  padding: 8px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
}

.lesson-rule code {
  font-size: 0.7rem;
  color: var(--color-accent);
  font-family: monospace;
}

.lesson-examples {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lesson-example {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.55rem;
  color: var(--text-secondary);
}

.lesson-correct {
  color: #22c55e;
  font-size: 0.7rem;
}

.lesson-example b {
  color: var(--color-accent);
}

.lesson-tip {
  font-size: 0.5rem;
  color: var(--text-muted);
  padding: 8px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--radius-sm);
  text-align: center;
}

/* News Mode Content */
.news-content {
  gap: 8px;
}

.news-category {
  font-size: 0.5rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.1em;
}

.news-headline {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.news-text {
  font-size: 0.55rem;
  color: var(--text-secondary);
  line-height: 1.4;
  flex: 1;
}

.news-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.5rem;
  color: var(--text-muted);
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Modes Responsive */
@media (max-width: 1200px) {
  .modes-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .modes-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .mode-phone {
    max-width: 160px;
  }
}

@media (max-width: 480px) {
  .modes-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .mode-phone {
    max-width: 200px;
  }
}