/* Vocabcast Website - Modern Design System */

:root {
  /* Colors - Material Design 3 inspired */
  --primary: #6750A4;
  --primary-light: #7965AF;
  --primary-dark: #4F378B;
  --secondary: #625B71;
  --tertiary: #7D5260;

  --surface: #FEFBFF;
  --surface-variant: #E7E0EC;
  --background: #FEFBFF;

  --on-primary: #FFFFFF;
  --on-secondary: #FFFFFF;
  --on-surface: #1C1B1F;
  --on-surface-variant: #49454F;

  --error: #B3261E;
  --success: #4CAF50;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;

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

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --surface: #1C1B1F;
    --surface-variant: #49454F;
    --background: #1C1B1F;
    --on-surface: #E6E1E5;
    --on-surface-variant: #CAC4D0;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--background);
  color: var(--on-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(254, 251, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  .navbar {
    background: rgba(28, 27, 31, 0.95);
  }
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  text-decoration: none;
  color: var(--primary);
  font-size: 1.5rem;
  font-weight: 700;
}

.navbar-menu {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.navbar-menu a {
  color: var(--on-surface);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.navbar-menu a:hover {
  color: var(--primary);
  background: var(--surface-variant);
}

/* Hero Section */
.hero {
  margin-top: 80px;
  padding: var(--spacing-xxl) 0;
  text-align: center;
  background: linear-gradient(135deg, #6750A4 0%, #7965AF 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

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

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-xl);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
  background: var(--surface-variant);
  transform: translateY(-2px);
}

.btn-group {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* Features Section */
.features {
  padding: var(--spacing-xxl) 0;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  color: var(--primary);
}

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

.feature-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
}

.feature-card p {
  color: var(--on-surface-variant);
  line-height: 1.7;
}

/* Content Sections */
.content-section {
  padding: var(--spacing-xxl) 0;
}

.content-section h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.content-section h3 {
  font-size: 1.5rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--secondary);
}

.content-section p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
  color: var(--on-surface-variant);
}

.content-section ul, .content-section ol {
  margin-left: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.content-section li {
  margin-bottom: var(--spacing-xs);
  color: var(--on-surface-variant);
}

/* Footer */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--surface-variant);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-xxl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.1rem;
}

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

.footer-section a {
  color: var(--on-surface-variant);
  text-decoration: none;
  transition: color 0.2s ease;
  display: block;
  margin-bottom: var(--spacing-xs);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--surface-variant);
  color: var(--on-surface-variant);
  font-size: 0.9rem;
}

/* App Badges */
.app-badges {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-md);
}

.badge-link img {
  height: 50px;
  border-radius: var(--radius-sm);
  transition: transform 0.2s ease;
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .navbar-menu {
    display: none; /* Mobile menu - can be enhanced with JS */
  }

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

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

.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.py-xl {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}