/* Aurora Design System - Pure CSS */

/* CSS Variables */
:root {
  /* Colors */
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-light: #a5b4fc;
  --color-secondary: #8b5cf6;
  --color-accent: #06b6d4;
  
  --color-text-primary: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  
  /* 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, #667eea 0%, #764ba2 50%, #f093fb 100%);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 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;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-muted: #9ca3af;
    
    --color-bg-primary: #111827;
    --color-bg-secondary: #1f2937;
    --color-bg-tertiary: #374151;
    
    --color-border: #374151;
    --color-border-light: #4b5563;
  }
}

/* Reset and base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--font-size-5xl);
}

h2 {
  font-size: var(--font-size-4xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

p {
  margin-bottom: var(--space-md);
  line-height: var(--line-height-relaxed);
}

.lead {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.section-lead {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--space-3xl);
}

/* Gradient text */
.gradient-text {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-lg);
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.button--sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
}

.button--lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-lg);
}

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

.button--primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.button--ghost {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
  border-color: var(--color-border);
  backdrop-filter: blur(10px);
}

.button--ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

/* Focus styles */
.button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 100;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.brand-mark {
  font-size: var(--font-size-xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

/* Hero section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  color: white;
}

.hero h1 {
  color: white;
  margin-bottom: var(--space-lg);
}

.hero .lead {
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

.actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

/* Sections */
.section {
  padding: var(--space-4xl) 0;
}

.section h2 {
  text-align: center;
  margin-bottom: var(--space-md);
}

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

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

.card .icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-md);
  display: block;
}

.card h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.card p {
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Gallery grid */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-3xl);
}

.tile {
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: end;
  padding: var(--space-lg);
  color: white;
  text-decoration: none;
  transition: transform var(--transition-normal);
}

.tile:hover {
  transform: scale(1.02);
}

.tile figcaption {
  font-weight: 500;
  font-size: var(--font-size-sm);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.tile--a {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.tile--b {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.tile--c {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.tile--d {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.tile--e {
  background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.tile--f {
  background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

/* CTA section */
.cta {
  background: var(--color-bg-secondary);
}

.cta-card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-2xl);
  padding: var(--space-3xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border-light);
}

.cta-title {
  margin-bottom: var(--space-md);
}

.cta-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

/* Footer */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-xl) 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-nav {
  display: flex;
  gap: var(--space-lg);
}

.footer-nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

/* Responsive design */
@media (max-width: 768px) {
  .header-inner {
    padding: var(--space-sm) var(--space-md);
  }
  
  .nav {
    gap: var(--space-md);
  }
  
  .nav a:not(.button) {
    display: none;
  }
  
  h1 {
    font-size: var(--font-size-4xl);
  }
  
  h2 {
    font-size: var(--font-size-3xl);
  }
  
  .hero {
    min-height: 80vh;
  }
  
  .actions {
    flex-direction: column;
    align-items: center;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  
  .cta-card {
    padding: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  
  .tile {
    aspect-ratio: 16/9;
  }
}

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

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

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .actions {
    display: none;
  }
  
  .hero {
    min-height: auto;
    background: none;
    color: var(--color-text-primary);
  }
  
  .gradient-text {
    background: none;
    -webkit-text-fill-color: var(--color-text-primary);
    color: var(--color-text-primary);
  }
}