/* ==========================================================================
   Osez Devenir Libre ! - Modern Responsive Design System
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

/* --- CSS Variables / Design Tokens --- */
:root {
  /* Brand Palette inspired by book cover (#151e3f) */
  --color-primary: #151e3f;
  --color-primary-light: #1e2b58;
  --color-primary-dark: #0b132b;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #eff6ff;
  
  /* Amber / Gold Accents */
  --color-gold: #f59e0b;
  --color-gold-hover: #d97706;
  --color-gold-light: #fef3c7;
  --color-gold-dark: #92400e;
  
  /* Neutral / Canvas Colors */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-subtle: #f1f5f9;
  
  /* Text */
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-text-subtle: #94a3b8;
  --color-text-inverse: #ffffff;
  
  /* Feedback */
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-danger: #ef4444;
  --color-danger-light: #fee2e2;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  
  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 2px 4px 0 rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.1), 0 4px 10px -2px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 32px -6px rgba(15, 23, 42, 0.14), 0 8px 16px -4px rgba(15, 23, 42, 0.06);
  --shadow-gold: 0 8px 20px -4px rgba(245, 158, 11, 0.35);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Base Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
  font-weight: 400;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
}

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

a:hover {
  color: var(--color-accent-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

@media (min-width: 768px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2.25rem; }
  h3 { font-size: 1.5rem; }
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-gold);
  color: var(--color-primary-dark);
  padding: 0.5rem 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(21, 30, 63, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  height: var(--header-height);
  display: flex;
  align-items: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.site-logo:hover {
  color: var(--color-gold);
}

.logo-badge {
  background: linear-gradient(135deg, var(--color-gold), #f97316);
  color: #000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Desktop Nav */
.desktop-nav {
  display: none;
}

@media (min-width: 992px) {
  .desktop-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
  }
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover, .nav-link:focus, .nav-item.active .nav-link {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

.nav-link svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.nav-item:hover .nav-link svg {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 250px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  padding: 0.5rem;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 100;
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: 0.6rem 0.85rem;
  font-size: 0.9rem;
  color: var(--color-text);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.dropdown-link:hover {
  background: var(--color-accent-light);
  color: var(--color-accent);
  padding-left: 1.1rem;
}

/* Header CTAs */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-header-buy {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--color-gold), #f59e0b);
  color: #111827;
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-gold);
  transition: var(--transition);
}

.btn-header-buy:hover {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #000;
  transform: translateY(-2px);
}

/* Mobile Toggle */
.mobile-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: #ffffff;
  padding: 0.5rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

@media (min-width: 992px) {
  .mobile-nav-toggle {
    display: none;
  }
}

.mobile-nav-toggle svg {
  width: 28px;
  height: 28px;
}

/* --- Mobile Drawer Navigation --- */
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 19, 43, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1998;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.mobile-drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 85%;
  max-width: 360px;
  background: var(--color-primary-dark);
  color: #ffffff;
  z-index: 1999;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}

.mobile-drawer.active {
  transform: translateX(0);
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-drawer-close {
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 1.75rem;
  line-height: 1;
  padding: 0.25rem;
  cursor: pointer;
}

.mobile-drawer-content {
  padding: 1.5rem;
  flex: 1;
}

.mobile-section-title {
  color: var(--color-gold);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 1.25rem 0 0.5rem;
}

.mobile-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav-item a {
  display: block;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-nav-item a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  padding-left: 1rem;
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  padding: 2.5rem 0 4rem;
}

/* --- Hero Section & Page Headers --- */
.page-hero {
  background: linear-gradient(135deg, #151e3f 0%, #0b132b 100%);
  color: #ffffff;
  padding: 3.5rem 0 3rem;
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
}

.page-hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 40%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero h1 {
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.page-hero .hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 750px;
  line-height: 1.6;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 1rem;
}

.breadcrumbs a {
  color: rgba(255, 255, 255, 0.8);
}

.breadcrumbs a:hover {
  color: var(--color-gold);
}

.breadcrumbs span {
  color: rgba(255, 255, 255, 0.4);
}

/* --- Featured Book Card (Conversion Hero Component) --- */
.book-featured-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  margin-bottom: 3.5rem;
  position: relative;
}

.book-featured-badge {
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-gold);
  text-align: center;
  padding: 0.85rem 1.5rem;
  font-weight: 700;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--color-gold);
}

.book-featured-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 2rem 1.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .book-featured-body {
    grid-template-columns: 280px 1fr;
    padding: 2.5rem;
  }
}

.book-featured-cover {
  text-align: center;
}

.book-featured-cover img {
  max-width: 240px;
  margin: 0 auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease;
}

.book-featured-cover a:hover img {
  transform: scale(1.03) rotate(-1deg);
}

.book-featured-info h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.book-featured-info p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.book-pricing-box {
  background: var(--color-surface-alt);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.pricing-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.price-tag {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
}

.price-strike {
  text-decoration: line-through;
  color: var(--color-text-subtle);
  font-weight: 400;
  margin-right: 0.25rem;
}

.discount-badge {
  background: #fee2e2;
  color: #dc2626;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-full);
}

.prime-mention {
  font-size: 0.9rem;
  color: #0284c7;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.book-featured-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-amazon {
  background: linear-gradient(135deg, var(--color-gold), #f59e0b);
  color: #111827;
  font-weight: 700;
  box-shadow: var(--shadow-gold);
}

.btn-amazon:hover {
  background: linear-gradient(135deg, #fbbf24, #d97706);
  color: #000;
  transform: translateY(-2px);
}

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

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

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* --- Section Title & Headers --- */
.section-header {
  margin-bottom: 2rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 650px;
}

/* --- Grids --- */
.grid {
  display: grid;
  gap: 1.75rem;
}

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

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

.grid-4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* --- Modern Cards --- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}

.card-img-wrapper {
  position: relative;
  overflow: hidden;
  background: var(--color-surface-alt);
  aspect-ratio: 16 / 9;
}

.card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card-img-wrapper img {
  transform: scale(1.05);
}

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.card-title a {
  color: inherit;
}

.card-title a:hover {
  color: var(--color-accent);
}

.card-text {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex: 1;
}

.card-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Calculator Card specifically */
.calc-card {
  border-top: 4px solid var(--color-primary);
}

.calc-card.accent-card {
  border-top-color: var(--color-accent);
}

.calc-card.gold-card {
  border-top-color: var(--color-gold);
}

.calc-card .card-body {
  padding: 1.75rem;
}

.calc-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-accent-light);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

/* --- Book Recommendation Card (autres-livres) --- */
.book-card {
  text-align: center;
  padding: 1.5rem;
}

.book-card-cover {
  width: 140px;
  height: 210px;
  margin: 0 auto 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  object-fit: cover;
  transition: transform 0.3s ease;
}

.book-card:hover .book-card-cover {
  transform: scale(1.05);
}

.book-card-title {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.book-card-author {
  color: var(--color-text-subtle);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

/* --- Calculators Interface System --- */
.calculator-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

@media (min-width: 992px) {
  .calculator-layout {
    grid-template-columns: 420px 1fr;
    align-items: start;
  }
}

.calc-form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
}

.calc-form-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.calc-form-header h2 {
  font-size: 1.35rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  background: #ffffff;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.input-unit {
  position: absolute;
  right: 1rem;
  color: var(--color-text-subtle);
  font-weight: 600;
  pointer-events: none;
}

.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.btn-calc {
  width: 100%;
  padding: 0.85rem;
  font-size: 1.05rem;
  font-weight: 700;
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  margin-top: 0.5rem;
}

.btn-calc:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Results & Chart */
.calc-results-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
}

.results-kpi-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

@media (min-width: 600px) {
  .results-kpi-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.kpi-card {
  background: var(--color-surface-alt);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.kpi-card.highlight {
  border-left-color: var(--color-gold);
  background: #fefce8;
}

.kpi-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.kpi-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  font-family: var(--font-heading);
}

.chart-wrapper {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-top: 1.5rem;
  position: relative;
  min-height: 320px;
}

/* --- Tables --- */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  background: var(--color-surface);
  margin-bottom: 2rem;
}

.modern-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.modern-table th {
  background: var(--color-primary);
  color: #ffffff;
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-family: var(--font-heading);
}

.modern-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.modern-table tr:nth-child(even) td {
  background: var(--color-surface-alt);
}

.modern-table tr:hover td {
  background: #f8fafc;
}

/* --- Article & Text Content --- */
.prose {
  max-width: 840px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
}

.prose h2 {
  margin: 2rem 0 1rem;
  font-size: 1.65rem;
}

.prose h3 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.35rem;
}

.prose p {
  margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
  margin-bottom: 1.5rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.callout {
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-light);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 1.75rem 0;
}

.callout-title {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

/* --- Glossary Alphabet Nav --- */
.glossary-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  padding: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  justify-content: center;
}

.glossary-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition);
}

.glossary-letter:hover, .glossary-letter.active {
  background: var(--color-accent);
  color: #ffffff;
  transform: translateY(-2px);
}

.glossary-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-xs);
  transition: var(--transition);
}

.glossary-item:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
}

.glossary-term {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

/* --- Resource List Item (Podcasts, Sites, Youtube) --- */
.resource-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.resource-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.resource-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #ffffff;
  background: var(--color-primary-light);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.resource-title {
  font-size: 1.35rem;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  list-style: none;
  padding: 0;
}

.resource-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--color-surface-alt);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.resource-btn:hover {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1.2fr 1.2fr 1.2fr;
  }
}

.footer-brand h3 {
  color: #ffffff;
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  max-width: 340px;
}

.footer-title {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--color-gold);
  padding-left: 0.25rem;
}

.footer-social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}

.footer-social-link:hover {
  background: linear-gradient(135deg, #833ab4, #fd1d1d, #fcb045);
  color: #ffffff;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
  font-size: 0.85rem;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-credits {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.5;
}

.footer-credits a {
  color: rgba(255, 255, 255, 0.65);
}

.footer-credits a:hover {
  color: var(--color-gold);
}

/* --- Cookie Banner --- */
.cookie-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
  max-width: 480px;
  background: rgba(21, 30, 63, 0.96);
  backdrop-filter: blur(12px);
  color: #ffffff;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.15);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.cookie-banner p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.5;
  margin: 0;
}

.cookie-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-cookie-accept {
  background: var(--color-gold);
  color: #111827;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-cookie-accept:hover {
  background: #fbbf24;
}

/* --- Back to Top Button --- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 990;
}

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

.back-to-top:hover {
  background: var(--color-accent);
  transform: translateY(-3px);
}

/* --- Document Preview Iframe (Extrait du livre) --- */
.preview-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2.5rem;
}

.preview-iframe {
  width: 100%;
  height: 800px;
  border: none;
  border-radius: var(--radius-md);
  display: block;
}

@media (max-width: 768px) {
  .preview-iframe {
    height: 550px;
  }
}