/* ============================================
   DEMOGINEERING - FEUILLE DE STYLES PRINCIPALE
   ============================================ */

/* Variables CSS */
:root {
  --color-primary: #8b5e3c; /* Bronze / Terre de Sienne */
  --color-primary-dark: #5d3e29;
  --color-primary-light: #f5ebe0;
  --color-accent: #c2976d; /* Or mat */
  --color-accent-light: #d4b499;
  --color-warm-gold: #d4af37; /* Or métallique */
  --color-warm-brown: #a67c52;
  --color-dark: #1f2937;
  --color-gray-dark: #374151;
  --color-gray-medium: #6b7280;
  --color-gray-light: #f9fafb;
  --color-white: #ffffff;
  --color-border: #e5e7eb;
  --color-cream: #fef3c7;
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 16px;
  --font-size-large: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 48px;
  
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

/* ============================================
   RÉINITIALISATION ET STYLES DE BASE
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-gray-dark);
  background-color: var(--color-white);
}

/* Accessibilité : focus visible */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   TYPOGRAPHIE
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

p {
  margin-bottom: var(--spacing-md);
}

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

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

a:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   CONTENEURS ET LAYOUT
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section--light {
  background-color: var(--color-gray-light);
}

.section--dark {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.section--dark h2,
.section--dark h3 {
  color: var(--color-white);
}

.section--warm {
  background: linear-gradient(135deg, #fef3c7 0%, #fef9e7 100%);
}

/* ============================================
   HEADER ET NAVIGATION
   ============================================ */

header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.language-switcher {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.language-btn {
  background: none;
  border: 1px solid var(--color-border);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 18px;
  transition: var(--transition);
}

.language-btn.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.language-btn:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
}

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

nav a {
  color: var(--color-gray-dark);
  font-weight: 500;
  transition: var(--transition);
}

nav a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.btn-cta-header {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: var(--transition);
}

.btn-cta-header:hover {
  background-color: var(--color-primary-dark);
  text-decoration: none;
}

/* Menu mobile */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--color-dark);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  font-size: clamp(32px, 8vw, 56px);
}

.hero p {
  font-size: var(--font-size-large);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   BOUTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  font-size: var(--font-size-base);
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-accent-light);
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
  text-decoration: none;
  transform: translateY(-2px);
}

/* ============================================
   GRILLES ET CARTES
   ============================================ */

.grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card--white {
  background-color: var(--color-white);
}

.card:hover {
  box-shadow: 0 8px 24px rgba(139, 94, 60, 0.15);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.card h3 {
  margin-top: 0;
  color: var(--color-primary);
}

.card-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}

/* ============================================
   SECTION PROBLÉMATIQUE
   ============================================ */

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.problem-item {
  text-align: center;
  padding: var(--spacing-md);
}

.problem-item-icon {
  font-size: 40px;
  margin-bottom: var(--spacing-md);
}

.problem-item p {
  font-weight: 500;
  color: var(--color-gray-dark);
}

/* ============================================
   SECTION PILIERS
   ============================================ */

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.pillar {
  text-align: center;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, #fef3c7 0%, #fef9e7 100%);
  border-radius: var(--border-radius);
  border: 1px solid #fcd34d;
}

.pillar-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}

.pillar h3 {
  margin-top: 0;
  color: var(--color-primary);
}

/* ============================================
   SECTION PHASES - EFFET FLOU
   ============================================ */

.phases-list {
  list-style: none;
  margin-top: var(--spacing-xl);
}

.phases-list li {
  padding: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
  position: relative;
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.phases-list li:before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.phases-list li:last-child {
  border-bottom: none;
}

/* Effet de flou renforcé sur les phases 1, 2, 3 */
.phases-list li:nth-child(2),
.phases-list li:nth-child(3),
.phases-list li:nth-child(4) {
  opacity: 0.3;
  filter: blur(8px);
  position: relative;
  user-select: none;
  pointer-events: none;
}

.phases-list li:nth-child(2)::after,
.phases-list li:nth-child(3)::after,
.phases-list li:nth-child(4)::after {
  content: "?";
  position: absolute;
  right: 0;
  font-size: 20px;
  color: var(--color-primary);
  font-weight: bold;
}

/* ============================================
   SECTION VOCABULAIRE
   ============================================ */

.vocabulary-grid, .faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.faq-item {
  background-color: var(--color-white);
  margin-bottom: var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  font-weight: bold;
  color: var(--color-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--color-white);
  transition: background-color 0.3s ease;
}

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

.faq-question::after {
  content: '+';
  font-size: 24px;
  transition: transform 0.3s ease;
}

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

.faq-answer {
  color: var(--color-gray-dark);
  line-height: 1.6;
  padding: 0 var(--spacing-lg);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.vocab-item {
  background-color: var(--color-white);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.vocab-term {
  font-size: var(--font-size-large);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.vocab-definition {
  color: var(--color-gray-dark);
  line-height: 1.6;
}

/* ============================================
   FORMULAIRE
   ============================================ */

form {
  max-width: 600px;
  margin: var(--spacing-xl) auto;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--color-gray-dark);
}

.required::after {
  content: " *";
  color: var(--color-accent);
}

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: var(--transition);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  background-color: var(--color-dark);
  color: var(--color-white);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.footer-section a {
  color: #b3b3b3;
}

.footer-section a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  border-top: 1px solid #333333;
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 14px;
  color: #999999;
}

.disclaimer {
  background-color: #fef3c7;
  border: 1px solid #fcd34d;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-lg);
  font-size: 13px;
  color: var(--color-gray-dark);
  line-height: 1.6;
}

.disclaimer strong {
  color: var(--color-primary);
}

/* ============================================
   ANIMATION DE TRANSFORMATION (ENTONNOIR)
   ============================================ */

.transformation-container {
  position: relative;
  width: 100%;
  max-width: 800px;
  height: 400px;
  margin: var(--spacing-2xl) auto;
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

@media (max-width: 768px) {
  .transformation-container {
    height: 500px; /* Plus de hauteur sur mobile pour laisser respirer les mots */
  }
  .particle {
    font-size: 14px !important;
    white-space: nowrap;
  }
  .process-visual {
    font-size: 40px;
  }
  .process-label {
    font-size: 12px;
    padding: 4px 10px;
  }
}

.transformation-side {
  position: absolute;
  top: 0;
  width: 40%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.side-left {
  left: 0;
  background-color: #f3f4f6;
}

.side-right {
  right: 0;
  background-color: #fffbeb;
}

.funnel-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 160px;
  height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.process-visual {
  font-size: 60px;
  line-height: 1;
  filter: drop-shadow(0 4px 10px rgba(0,0,0,0.2));
  margin-bottom: 10px;
  display: flex;
  gap: 10px;
}

.process-label {
  background: var(--color-primary);
  color: white;
  padding: 6px 16px;
  border-radius: 4px;
  font-weight: bold;
  font-size: 14px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 10px rgba(139, 94, 60, 0.3);
}

.particle {
  position: absolute;
  font-size: 18px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  z-index: 5;
}

@keyframes flow {
  0% {
    transform: translate(0, 0) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 0.8;
  }
  45% {
    transform: translate(280px, 0) rotate(10deg);
    opacity: 1;
  }
  50% {
    transform: translate(320px, 0) scale(0.7);
    opacity: 0.6;
  }
  55% {
    transform: translate(360px, 0) scale(1.1);
    opacity: 1;
  }
  90% {
    opacity: 0.8;
  }
  100% {
    transform: translate(650px, 0) rotate(-5deg);
    opacity: 0;
  }
}

.particle-chaos { 
  color: #6b7280; 
  font-family: monospace;
}

.particle-clarity { 
  color: var(--color-primary); 
  font-weight: 700;
  text-shadow: 0 0 10px rgba(217, 119, 6, 0.2);
}

.transformation-label {
  position: absolute;
  bottom: 20px;
  width: 100%;
  display: flex;
  justify-content: space-around;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-gray-medium);
}

/* ============================================
   UTILITAIRES
   ============================================ */

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.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); }

.max-width-container {
  max-width: 800px;
  margin: 0 auto;
}

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

.accent {
  color: var(--color-accent);
  font-weight: 600;
}

.hidden {
  display: none;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  :root {
    --font-size-3xl: 32px;
    --font-size-2xl: 24px;
    --font-size-xl: 20px;
    --spacing-2xl: 40px;
    --spacing-xl: 32px;
  }

  .header-content {
    padding: var(--spacing-sm) 0;
  }

  .header-right {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
    gap: var(--spacing-md);
  }

  nav.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 300px;
  }

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

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .pillars,
  .problem-grid,
  .vocabulary-grid {
    grid-template-columns: 1fr;
  }

  form {
    margin: var(--spacing-lg) auto;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .language-switcher {
    flex-direction: row;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-3xl: 24px;
    --font-size-2xl: 20px;
    --font-size-xl: 18px;
    --spacing-2xl: 32px;
    --spacing-xl: 24px;
    --spacing-lg: 16px;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  h1 {
    font-size: var(--font-size-2xl);
  }

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

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 14px;
  }

  .card {
    padding: var(--spacing-md);
  }

  .header-right {
    gap: var(--spacing-xs);
  }

  .language-btn {
    padding: var(--spacing-xs) var(--spacing-xs);
    font-size: 16px;
  }
}

/* ============================================
   IMPRESSION
   ============================================ */

@media print {
  header,
  footer,
  .btn-cta-header,
  .hero-cta {
    display: none;
  }

  body {
    color: #000;
    background-color: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}