/* Modern Design System for Bay Area Push Hands */
/* Custom CSS Variables and Enhanced Styling */

:root {
  /* Modern Color Palette - Calm and Professional */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  
  /* Neutrals */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Background gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-hero: linear-gradient(135deg, #111827 0%, #1f2937 45%, #312e81 100%);
  
  /* Typography */
  --font-primary: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --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;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

body {
  background-color: var(--gray-900);
  background-image: linear-gradient(135deg, #0f172a 0%, #1f2937 50%, #312e81 100%);
}

/* Enhanced Button Styles */
.button.primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.button.primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.button.primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.button.primary:hover::before {
  opacity: 1;
}

/* Card Enhancements */
.card {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--gray-200);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
}

.card-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.card-image img {
  transition: transform var(--transition-slow);
  display: block;
  width: 100%;
  height: auto;
}

.card:hover .card-image img {
  transform: scale(1.05);
}

/* Enhanced Features Section */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-xl) 0;
  margin: 0 auto;
  max-width: 1200px;
}

.feature-item {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--gray-50);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.feature-item:hover {
  background: white;
  border-color: var(--primary-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-item .icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Smooth Scrolling Enhancement */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* Enhanced Navigation */
#nav {
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

#nav ul li a {
  position: relative;
  transition: all var(--transition-fast);
}

#nav ul li a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--gradient-primary);
  transition: transform var(--transition-base);
}

#nav ul li a:hover::after,
#nav ul li a.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* Image Gallery Enhancement */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
  padding: var(--spacing-xl) 0;
}

.image-gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.image-gallery-item:hover {
  box-shadow: var(--shadow-xl);
  transform: scale(1.02);
}

.image-gallery-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.image-gallery-item:hover img {
  transform: scale(1.1);
}

.image-gallery-item::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.7) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.image-gallery-item:hover::after {
  opacity: 1;
}

/* Loading Animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* Section entrance animation */
.section-entrance {
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
}

/* Stagger animation for multiple items */
.fade-in-up:nth-child(1) { animation-delay: 0.1s; }
.fade-in-up:nth-child(2) { animation-delay: 0.2s; }
.fade-in-up:nth-child(3) { animation-delay: 0.3s; }
.fade-in-up:nth-child(4) { animation-delay: 0.4s; }

/* Enhanced Header */
#header.alt {
  background: var(--gradient-hero);
  padding: var(--spacing-2xl) 0;
}

#header h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Section Dividers */
.section-divider {
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  margin: var(--spacing-xl) auto;
  max-width: 100px;
}

/* Responsive Typography */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
  }
  
  .features {
    grid-template-columns: 1fr;
  }

  .opportunity-layout,
  .opportunity-layout.reverse {
    flex-direction: column;
    align-items: stretch;
  }

  .opportunity-media {
    max-width: 100%;
  }
}

/* Enhanced Footer */
#footer {
  background: linear-gradient(to bottom, var(--gray-50) 0%, var(--gray-100) 100%);
  padding: var(--spacing-2xl) 0;
}

/* Accessibility Enhancements */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus styles for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Improved link styles */
a {
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
}

/* Collapsible FAQ Section */
.faq-item {
  background: white;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: var(--spacing-md);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--gray-800);
  transition: background-color var(--transition-fast);
}

.faq-question:hover {
  background-color: var(--gray-50);
}

.faq-answer {
  padding: 0 var(--spacing-md);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), padding var(--transition-base);
}

.faq-item.active .faq-answer {
  padding: var(--spacing-md);
  max-height: 1000px; /* Increased for longer content */
}

.faq-icon {
  transition: transform var(--transition-base);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* Testimonial Slider */
.testimonial-slider {
  position: relative;
  max-width: 800px;
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-xl);
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.testimonial-slide {
  display: none;
  text-align: center;
  animation: fadeInUp 0.5s ease-out;
}

.testimonial-slide.active {
  display: block;
}

.testimonial-text {
  font-size: var(--font-size-lg);
  font-style: italic;
  color: var(--gray-700);
  margin-bottom: var(--spacing-md);
}

.testimonial-author {
  font-weight: 600;
  color: var(--primary-color);
}

/* Modern Badge */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--gradient-primary);
  color: white;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Opportunities Cards */
.opportunities-card {
  margin-bottom: var(--spacing-xl);
  text-align: left;
}

.opportunity-layout {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.opportunity-layout.reverse {
  flex-direction: row-reverse;
}

.opportunity-media {
  flex: 0 0 220px;
  max-width: 240px;
}

.opportunity-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.opportunity-content {
  flex: 1 1 320px;
  background: var(--gray-50);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.opportunities-card h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-2xl);
  font-weight: 700;
}

.opportunities-card h3 a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.opportunities-card h3 a:hover {
  color: var(--primary-dark);
}

.opportunities-card p {
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.opportunities-card .actions {
  margin-top: var(--spacing-lg);
}

/* Lightbox for images */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  z-index: 9999;
  backdrop-filter: blur(10px);
  animation: fadeIn 0.3s ease-out;
}

.lightbox.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

.lightbox-close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  background: white;
  color: var(--gray-800);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lightbox-close:hover {
  background: var(--gray-200);
  transform: rotate(90deg);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Pulse animation for CTA buttons */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

.pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}