/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary-color: #6B46C1;      /* Deep Purple */
  --secondary-color: #FFFFFF;     /* Pure White */
  --accent-color: #19e140;        /* Green */
  --text-dark: #1F2937;
  --text-light: #6B7280;
  --text-white: #FFFFFF;
  --background-light: #F9FAFB;
  --border-color: #E5E7EB;
  --shadow-light: rgba(107, 70, 193, 0.1);
  --shadow-medium: rgba(107, 70, 193, 0.2);
  --shadow-heavy: rgba(107, 70, 193, 0.3);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, #8B5CF6 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent-color) 0%, #10B981 100%);
  --gradient-neural: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* ===== RESET & BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--secondary-color);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
}

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

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-white);
  box-shadow: 0 4px 14px var(--shadow-light);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--shadow-medium);
  color: var(--text-white);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: var(--text-white);
  transform: translateY(-2px);
}

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition-normal);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
}

.nav-brand .brand-logo {
  display: flex;
  align-items: center;
  font-size: var(--font-size-2xl);
  font-weight: 800;
  text-decoration: none;
}

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

.brand-ai {
  color: var(--accent-color);
  margin-left: var(--spacing-xs);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: 500;
  color: var(--text-dark);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

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

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.language-switcher {
  display: flex;
  background: var(--background-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
}

.lang-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-light);
  cursor: pointer;
  transition: var(--transition-fast);
}

.lang-btn.active,
.lang-btn:hover {
  background: var(--secondary-color);
  color: var(--primary-color);
  box-shadow: 0 2px 4px var(--shadow-light);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--primary-color);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ===== HERO SECTION ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--secondary-color);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.neural-network {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 30%, rgba(107, 70, 193, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(25, 225, 64, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(107, 70, 193, 0.05) 0%, transparent 70%);
  animation: neuralPulse 8s ease-in-out infinite;
}

@keyframes neuralPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-3xl) 0;
}

.hero-title {
  font-size: var(--font-size-6xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xl);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-light);
  margin-bottom: var(--spacing-3xl);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
}

/* ===== ECOSYSTEM SECTION ===== */
.ecosystem {
  padding: var(--spacing-3xl) 0;
  background: var(--background-light);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.product-card {
  background: var(--secondary-color);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  box-shadow: 0 4px 20px var(--shadow-light);
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-medium);
}

.product-card.featured {
  border: 2px solid var(--primary-color);
  background: linear-gradient(135deg, rgba(107, 70, 193, 0.02) 0%, rgba(25, 225, 64, 0.02) 100%);
}

.product-card.featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-lg);
}

.product-badge {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--gradient-primary);
  color: var(--text-white);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-lg);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.product-badge.kids {
  background: var(--gradient-accent);
}

.product-badge.companion {
  background: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
}

.product-badge.market {
  background: linear-gradient(135deg, #0F766E 0%, #14B8A6 100%);
}

.product-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background-light);
  border-radius: var(--radius-lg);
  color: var(--primary-color);
  font-size: var(--font-size-xl);
}

.card-content {
  margin-bottom: var(--spacing-xl);
}

.product-name {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: var(--spacing-sm);
}

.product-tagline {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.product-description {
  font-size: var(--font-size-base);
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.product-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.feature-tag {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--background-light);
  color: var(--text-dark);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.card-footer {
  display: flex;
  justify-content: center;
}

/* ===== AI CORE SECTION ===== */
.ai-core {
  padding: var(--spacing-3xl) 0;
  background: var(--secondary-color);
}

.ai-core-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.ai-core-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.brain-animation {
  width: 300px;
  height: 300px;
  position: relative;
  background: var(--gradient-neural);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: brainPulse 4s ease-in-out infinite;
}

@keyframes brainPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(107, 70, 193, 0.4); }
  50% { transform: scale(1.05); box-shadow: 0 0 0 20px rgba(107, 70, 193, 0); }
}

.neural-nodes {
  width: 200px;
  height: 200px;
  background: var(--secondary-color);
  border-radius: 50%;
  position: relative;
}

.neural-nodes::before,
.neural-nodes::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background: var(--accent-color);
  border-radius: 50%;
  animation: nodeFloat 3s ease-in-out infinite;
}

.neural-nodes::before {
  top: 30%;
  left: 20%;
  animation-delay: 0s;
}

.neural-nodes::after {
  bottom: 30%;
  right: 20%;
  animation-delay: 1.5s;
}

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

.ai-core-text {
  padding-left: var(--spacing-xl);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.ai-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.ai-feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-dark);
}

.ai-feature i {
  width: 24px;
  color: var(--accent-color);
}

/* ===== ABOUT SECTION ===== */
.about {
  padding: var(--spacing-3xl) 0;
  background: var(--background-light);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.mission-text {
  text-align: left;
  margin-top: var(--spacing-xl);
}

.mission-text p {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.mission-list {
  list-style: none;
  margin-top: var(--spacing-xl);
}

.mission-list li {
  padding: var(--spacing-md) 0;
  font-size: var(--font-size-lg);
  color: var(--text-light);
  border-bottom: 1px solid var(--border-color);
}

.mission-list li:last-child {
  border-bottom: none;
}

.mission-list strong {
  color: var(--primary-color);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--text-dark);
  color: var(--text-white);
  padding: var(--spacing-3xl) 0 var(--spacing-xl) 0;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .brand-logo {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

.footer-brand .brand-text {
  color: var(--text-white);
}

.footer-brand .brand-ai {
  color: var(--accent-color);
}

.footer-description {
  color: #9CA3AF;
  margin-bottom: var(--spacing-lg);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-white);
  transition: var(--transition-fast);
}

.social-link:hover {
  background: var(--primary-color);
  color: var(--text-white);
  transform: translateY(-2px);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.footer-column h4 {
  color: var(--text-white);
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: var(--spacing-sm);
}

.footer-column a {
  color: #9CA3AF;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-bottom p {
  color: #9CA3AF;
  margin: 0;
}

.anipin-link a {
  color: var(--accent-color);
  font-weight: 600;
}

.anipin-link a:hover {
  color: var(--primary-color);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  .ai-core-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .ai-core-text {
    padding-left: 0;
  }
  
  .brain-animation {
    width: 250px;
    height: 250px;
  }
  
  .neural-nodes {
    width: 150px;
    height: 150px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .ecosystem-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    text-align: left;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .brain-animation {
    width: 200px;
    height: 200px;
  }
  
  .neural-nodes {
    width: 120px;
    height: 120px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .product-card {
    padding: var(--spacing-lg);
  }
  
  .ecosystem-grid {
    gap: var(--spacing-lg);
  }
}

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

.hidden { display: none; }
.visible { display: block; }

.fade-in {
  opacity: 0;
  animation: fadeIn 0.6s ease-in-out forwards;
}

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

.slide-up {
  transform: translateY(30px);
  opacity: 0;
  animation: slideUp 0.6s ease-out forwards;
}

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

/* ===== SCROLL ANIMATIONS ===== */
.scroll-reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.6s ease-out;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== LANGUAGE SWITCHING ===== */
[data-lang]:not([data-lang=""]) {
  display: none;
}

.lang-en [data-en] {
  display: inline !important;
}

.lang-zh [data-zh] {
  display: inline !important;
}

/* ===== LOADING STATES ===== */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { left: -100%; }
  100% { left: 100%; }
}