/* Smart Enigma - Page de Présentation CSS */
/* ======================================== */

:root {
  /* Couleurs principales */
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #dbeafe;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --danger-color: #ef4444;
  --success-color: #22c55e;
  
  /* Couleurs de fond et surfaces */
  --bg-color: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --surface: #ffffff;
  --surface-hover: #f8fafc;
  
  /* Couleurs de texte */
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  /* Bordures et dividers */
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  
  /* Ombres */
  --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);
  --shadow-glow: 0 0 0 3px rgb(59 130 246 / 0.15);
  
  /* Rayons de bordure */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Espacements */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Typographie */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --transition: all 0.2s ease-out;
}

/* Mode sombre automatique */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --surface: #1e293b;
    --surface-hover: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --border-color: #334155;
    --border-hover: #475569;
    
    --primary-light: #1e3a8a;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.4), 0 8px 10px -6px rgb(0 0 0 / 0.4);
  }
}

/* Reset et base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  background: var(--bg-color);
  color: var(--text-primary);
  transition: var(--transition);
}

/* Section Hero */
.hero {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="white" opacity="0.1"><polygon points="0,0 1000,0 1000,60 0,100"/></svg>') no-repeat center bottom;
  background-size: cover;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  margin-bottom: var(--space-lg);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
  letter-spacing: -0.02em;
  animation: slideInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: 1.25rem;
  opacity: 0.95;
  margin-bottom: var(--space-xl);
  animation: slideInUp 0.8s ease-out 0.2s both;
}

.hero-features {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
  animation: slideInUp 0.8s ease-out 0.4s both;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1rem;
  font-weight: 600;
}

.hero-feature-icon {
  font-size: 1.5rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

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

/* Sections générales */
.section {
  padding: var(--space-3xl) 0;
}

.section:nth-child(even) {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Section About */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.stat-card {
  background: var(--surface);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: 2px solid var(--border-color);
}

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

.stat-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  display: block;
}

.stat-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.stat-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Grille des fonctionnalités */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.feature-card {
  background: var(--surface);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

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

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
  display: block;
  color: var(--primary-color);
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Section Comment ça marche */
.demo-section {
  text-align: center;
}

.demo-images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin: var(--space-3xl) 0;
}

.demo-image-container {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transition: var(--transition);
}

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

.demo-image {
  width: 100%;
  height: auto;
  display: block;
  transition: var(--transition);
}

.steps-list {
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding: var(--space-xl);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border-left: 4px solid var(--primary-color);
}

.step-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.step-number {
  background: var(--primary-color);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  font-size: 1.1rem;
}

.step-content {
  flex: 1;
}

.step-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  font-size: 1.1rem;
}

.step-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

.info-note {
  background: var(--primary-light);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  margin-top: var(--space-xl);
  border-left: 4px solid var(--primary-color);
}

.info-note-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--space-md);
  font-size: 1.1rem;
}

.info-note-content {
  color: var(--text-secondary);
  line-height: 1.7;
}

.info-note-content p {
  margin-bottom: var(--space-sm);
}

.info-note-content p:last-child {
  margin-bottom: 0;
}

/* Section CTA */
.cta-section {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="white" opacity="0.1"><polygon points="0,40 1000,0 1000,100 0,100"/></svg>') no-repeat center top;
  background-size: cover;
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--space-lg);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.cta-description {
  font-size: 1.2rem;
  opacity: 0.95;
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
}

/* Boutons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: white;
  color: var(--primary-color);
  padding: var(--space-lg) var(--space-2xl);
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
  transition: var(--transition);
}

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

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background: var(--bg-color);
}

.btn:active {
  transform: translateY(0);
}

.btn-icon {
  font-size: 1.2rem;
}

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

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

/* Animations au scroll */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Design responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .hero {
    padding: var(--space-2xl) var(--space-lg);
    min-height: 70vh;
  }

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

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

  .hero-features {
    flex-direction: column;
    gap: var(--space-md);
  }

  .demo-images {
    grid-template-columns: 1fr;
  }

  .step-item {
    flex-direction: column;
    text-align: center;
  }

  .steps-list {
    text-align: center;
  }

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

  .about-stats {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .feature-card,
  .stat-card {
    padding: var(--space-lg);
  }

  .hero {
    min-height: 60vh;
  }

  .container {
    padding: 0 var(--space-md);
  }
}

/* Préférences utilisateur - Mouvement réduit */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .fade-in {
    opacity: 1;
    transform: translateY(0);
  }
}