/* Main Styles */
:root {
  /* Couleurs principales */
  --color-primary: #FF7A00;
  --color-primary-light: #FF9633;
  --color-primary-dark: #CC6200;
  
  /* Couleurs secondaires */
  --color-secondary: #1E293B;
  --color-secondary-light: #334155;
  --color-secondary-dark: #0F172A;
  
  /* Autres couleurs */
  --color-accent: #3B82F6;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Couleurs neutres - Mode clair */
  --color-text: #1E293B;
  --color-text-light: #64748B;
  --color-background: #FFFFFF;
  --color-background-alt: #F8FAFC;
  --color-border: #E2E8F0;
  --color-card: #FFFFFF;
  --color-card-shadow: rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Espacement (système basé sur 8px) */
  --space-1: 0.8rem;  /* 8px */
  --space-2: 1.6rem;  /* 16px */
  --space-3: 2.4rem;  /* 24px */
  --space-4: 3.2rem;  /* 32px */
  --space-5: 4.8rem;  /* 48px */
  --space-6: 6.4rem;  /* 64px */
  --space-7: 8rem;    /* 80px */
  --space-8: 9.6rem;  /* 96px */

  /* Rayons de bordure */
  --radius-sm: 0.4rem;
  --radius-md: 0.8rem;
  --radius-lg: 1.6rem;
  --radius-full: 999px;

  /* Conteneur */
  --container-width: 120rem;
  --header-height: 8rem;
}

/* Mode sombre */
[data-theme="dark"] {
  --color-text: #F8FAFC;
  --color-text-light: #CBD5E1;
  --color-background: #0F172A;
  --color-background-alt: #1E293B;
  --color-border: #334155;
  --color-card: #1E293B;
  --color-card-shadow: rgba(0, 0, 0, 0.3);
}

/* Mise en page générale */
body {
  color: var(--color-text);
  background-color: var(--color-background);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-2);
}

/* Typographie */
h1 {
  font-size: 4.8rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

h2 {
  font-size: 3.6rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

h3 {
  font-size: 2.4rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

h4 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

p {
  margin-bottom: var(--space-2);
}

/* Section headers */
.section-header {
  text-align: center;
  max-width: 70rem;
  margin: 0 auto var(--space-5);
}

.section-header h2 {
  margin-bottom: var(--space-1);
}

.section-header p {
  color: var(--color-text-light);
  font-size: 1.8rem;
}

/* Boutons */
.btn-primary, .btn-secondary {
  display: inline-block;
  padding: 1.2rem 2.4rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.btn-text {
  color: var(--color-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  transition: all var(--transition-fast);
}

.btn-text i {
  margin-left: var(--space-1);
  transition: transform var(--transition-fast);
}

.btn-text:hover {
  color: var(--color-primary-dark);
}

.btn-text:hover i {
  transform: translateX(4px);
}

/* Sections communes */
section {
  padding: var(--space-6) 0;
}

/* Highlight text */
.highlight {
  color: var(--color-primary);
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 3rem;
  right: 3rem;
  background-color: var(--color-primary);
  color: white;
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: 0 0.4rem 1rem rgba(0, 0, 0, 0.1);
}

.back-to-top.active {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-5px);
}

/* Responsive */
@media (max-width: 1200px) {
  html {
    font-size: 58%;
  }
}

@media (max-width: 992px) {
  html {
    font-size: 56%;
  }

  h1 {
    font-size: 4rem;
  }

  h2 {
    font-size: 3.2rem;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 54%;
  }

  h1 {
    font-size: 3.6rem;
  }

  h2 {
    font-size: 2.8rem;
  }

  section {
    padding: var(--space-5) 0;
  }
}

@media (max-width: 576px) {
  html {
    font-size: 52%;
  }

  h1 {
    font-size: 3.2rem;
  }

  h2 {
    font-size: 2.4rem;
  }
}