/* ===== CSS Variables ===== */
:root {
  /* Kids Habit Builder Palette */
  --primary-purple: #7C3AED;
  --fresh-green: #10B981;
  --warm-yellow: #FBBF24;
  --light-purple-bg: #F5F3FF;
  
  /* Neutral Colors */
  --white: #FFFFFF;
  --dark-text: #1F2937;
  --gray-text: #6B7280;
  --light-gray: #F9FAFB;
  --border-gray: #E5E7EB;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  line-height: 1.2;
  color: var(--dark-text);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

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

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

.section {
  padding: var(--spacing-2xl) 0;
}

/* ===== Header & Navigation ===== */
header {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-gray);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.logo img {
  height: 40px;
  max-height: 40px;
  width: auto;
  max-width: 150px;
  object-fit: contain;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-purple);
  font-family: 'Poppins', sans-serif;
}

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

.nav-links a {
  color: var(--dark-text);
  font-weight: 500;
  font-size: 1rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

.nav-links a:hover {
  color: var(--primary-purple);
  background: var(--light-purple-bg);
}

.nav-links .btn-primary {
  background: var(--primary-purple);
  color: var(--white);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.nav-links .btn-primary:hover {
  background: #6d28d9;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--dark-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--light-purple-bg) 0%, var(--white) 100%);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: var(--primary-purple);
  opacity: 0.05;
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-20px, 20px) rotate(180deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--primary-purple) 0%, #9333ea 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: var(--gray-text);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-xl);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  font-family: 'Inter', sans-serif;
}

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

.btn-primary:hover {
  background: #6d28d9;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--white);
  color: var(--primary-purple);
  border: 2px solid var(--primary-purple);
}

.btn-secondary:hover {
  background: var(--light-purple-bg);
  transform: translateY(-2px);
}

.btn-large {
  padding: 1.125rem 2.5rem;
  font-size: 1.125rem;
}

/* ===== Apps Section ===== */
.apps-section {
  padding: var(--spacing-2xl) 0;
  background: var(--light-gray);
}

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

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

.section-description {
  color: var(--gray-text);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.app-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.app-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.app-card-image {
  width: 100%;
  height: 240px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--light-purple-bg) 0%, var(--primary-purple) 100%);
}

.app-card-content {
  padding: var(--spacing-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.app-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.app-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.app-card h3 {
  margin-bottom: var(--spacing-xs);
  color: var(--dark-text);
}

.app-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--light-purple-bg);
  color: var(--primary-purple);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.app-description {
  color: var(--gray-text);
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
  line-height: 1.6;
}

.app-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.feature-tag {
  padding: 0.25rem 0.625rem;
  background: var(--light-gray);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--gray-text);
}

.app-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--light-purple-bg);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
}

.status-badge {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fresh-green);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.app-status span {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-purple);
}

.store-badges {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: auto;
}

.store-badge {
  flex: 1;
}

.store-badge img {
  width: 100%;
  height: auto;
  transition: transform 0.3s ease;
}

.store-badge:hover img {
  transform: scale(1.05);
}

.app-link {
  display: block;
  margin-top: var(--spacing-md);
  color: var(--primary-purple);
  font-weight: 600;
  text-align: center;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

.app-link:hover {
  background: var(--light-purple-bg);
}

/* ===== Features Section ===== */
.features-section {
  padding: var(--spacing-2xl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--white);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background: linear-gradient(135deg, var(--primary-purple) 0%, #9333ea 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

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

.feature-card p {
  color: var(--gray-text);
  line-height: 1.6;
}

/* ===== Footer ===== */
footer {
  background: var(--dark-text);
  color: var(--white);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section h3 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

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

.footer-section ul li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: #9CA3AF;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: var(--spacing-xl) auto 0;
  padding: var(--spacing-lg) var(--spacing-lg) 0;
  border-top: 1px solid #374151;
  text-align: center;
  color: #9CA3AF;
  font-size: 0.875rem;
}

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

.social-link {
  width: 40px;
  height: 40px;
  background: #374151;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

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

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-purple) 0%, #9333ea 100%);
  color: var(--white);
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin: var(--spacing-2xl) auto;
  max-width: 1200px;
}

.cta-section h2 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  .navbar {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    gap: var(--spacing-sm);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .apps-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .social-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .btn {
    width: 100%;
  }
  
  .store-badges {
    flex-direction: column;
  }
}