/* ============================================
   ReWorth Landing Page - Premium Design System
   ============================================ */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
:root {
  /* Brand Colors */
  --brand-primary: #147C8A;
  --brand-primary-light: #1A9AAB;
  --brand-primary-dark: #0F5A65;
  
  /* Gradient Colors */
  --gradient-start: #147C8A;
  --gradient-mid: #1A9AAB;
  --gradient-end: #20B8CC;
  
  /* Semantic Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-info: #3B82F6;
  
  /* Neutral Colors - Dark Mode First */
  --bg-primary: #0A0E14;
  --bg-secondary: #151B23;
  --bg-tertiary: #1F2937;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  
  /* Text Colors */
  --text-primary: #F9FAFB;
  --text-secondary: #D1D5DB;
  --text-tertiary: #9CA3AF;
  --text-muted: #6B7280;
  
  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Typography */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* 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);
  --shadow-glow: 0 0 30px rgba(20, 124, 138, 0.3);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Gradient Animation */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 20%, rgba(20, 124, 138, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(32, 184, 204, 0.1) 0%, transparent 50%);
  z-index: -1;
  pointer-events: none;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: 700;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(var(--text-2xl), 3vw, var(--text-4xl));
  font-weight: 600;
}

h4 {
  font-size: clamp(var(--text-xl), 2vw, var(--text-3xl));
  font-weight: 600;
}

p {
  font-size: var(--text-lg);
  line-height: 1.8;
  color: var(--text-secondary);
}

a {
  color: var(--brand-primary-light);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--gradient-end);
}

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

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* ============================================
   Glass Card Component
   ============================================ */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
  opacity: 0.5;
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(20, 124, 138, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   Button Components
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-xl);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  box-shadow: 0 4px 15px rgba(20, 124, 138, 0.4);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(20, 124, 138, 0.5);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--brand-primary);
  transform: translateY(-2px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--spacing-2xl) 0;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  z-index: 2;
  position: relative;
}

.hero-title {
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease-out;
}

.hero-description {
  font-size: var(--text-2xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero-visual {
  margin-top: var(--spacing-2xl);
  animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.hero-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

/* Floating Animation for Hero Elements */
@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.float-animation {
  animation: float 6s ease-in-out infinite;
}

/* ============================================
   Feature Grid
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: var(--radius-xl);
  font-size: var(--text-4xl);
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition-base);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-title {
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.feature-description {
  color: var(--text-secondary);
  font-size: var(--text-base);
}

/* ============================================
   Use Cases Section
   ============================================ */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.use-case-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 1;
  cursor: pointer;
}

.use-case-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.use-case-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-lg);
  background: linear-gradient(to top, rgba(10, 14, 20, 0.95), transparent);
  transform: translateY(0);
  transition: transform var(--transition-base);
}

.use-case-card:hover .use-case-image {
  transform: scale(1.1);
}

.use-case-card:hover .use-case-overlay {
  transform: translateY(-10px);
}

.use-case-title {
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-xs);
}

.use-case-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-container {
  max-width: 800px;
  margin: var(--spacing-2xl) auto 0;
}

.faq-item {
  margin-bottom: var(--spacing-md);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(20, 124, 138, 0.3);
}

.faq-question {
  width: 100%;
  padding: var(--spacing-lg);
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  transition: color var(--transition-base);
}

.faq-question:hover {
  color: var(--brand-primary-light);
}

.faq-icon {
  font-size: var(--text-2xl);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-answer-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

/* ============================================
   Formula Display
   ============================================ */
.formula-container {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 2px solid var(--brand-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  margin: var(--spacing-2xl) auto;
  max-width: 600px;
  text-align: center;
  box-shadow: var(--shadow-glow);
}

.formula {
  font-family: 'Courier New', monospace;
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--brand-primary-light);
  margin: var(--spacing-lg) 0;
  letter-spacing: 0.05em;
}

.formula-explanation {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
}

/* ============================================
   Stats Section
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.stat-card {
  text-align: center;
  padding: var(--spacing-lg);
}

.stat-number {
  font-size: var(--text-5xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: var(--radius-2xl);
  padding: var(--spacing-3xl) var(--spacing-2xl);
  text-align: center;
  margin: var(--spacing-3xl) auto;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

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

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

.cta-description {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-xl);
}

.cta-button {
  background: white;
  color: var(--brand-primary);
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--text-xl);
  font-weight: 700;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.cta-button:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid var(--glass-border);
  margin-top: var(--spacing-3xl);
}

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

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

.footer-link:hover {
  color: var(--brand-primary-light);
}

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

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

/* Scroll-triggered animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  :root {
    --spacing-3xl: 4rem;
    --spacing-2xl: 3rem;
  }
  
  .hero {
    min-height: auto;
    padding: var(--spacing-3xl) 0;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .feature-grid,
  .use-cases-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .formula {
    font-size: var(--text-xl);
  }
}

@media (max-width: 480px) {
  .container,
  .container-wide {
    padding: 0 var(--spacing-md);
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .glass-card {
    padding: var(--spacing-lg);
  }
}

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

.text-gradient {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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