/* ============================================
   Formation en Biostatistique — Design moderne
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --primary: #1a365d;
  --primary-light: #2b6cb0;
  --primary-lighter: #bee3f8;
  --accent: #ed8936;
  --accent-light: #fbd38d;
  --success: #38a169;
  --success-light: #c6f6d5;
  --danger: #e53e3e;
  --danger-light: #fed7d7;
  --info: #3182ce;
  --info-light: #bee3f8;
  --purple: #805ad5;
  --purple-light: #e9d8fd;
  --gray-50: #f7fafc;
  --gray-100: #edf2f7;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e0;
  --gray-600: #718096;
  --gray-700: #4a5568;
  --gray-800: #2d3748;
  --gray-900: #1a202c;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Typographie ---- */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif !important;
  color: var(--gray-800);
  line-height: 1.7;
}

code, pre, .sourceCode {
  font-family: 'JetBrains Mono', 'Fira Code', monospace !important;
}

h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}

h1 { font-size: 2.2rem; }
h2 { font-size: 1.6rem; border-bottom: 3px solid var(--primary-lighter); padding-bottom: 0.4rem; margin-top: 2.5rem; }
h3 { font-size: 1.25rem; color: var(--primary-light); }

/* ---- Navbar ---- */
.navbar {
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}

/* ---- Hero section (page d'accueil) ---- */
.hero-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, #4299e1 100%);
  color: white;
  padding: 3.5rem 2.5rem;
  border-radius: var(--radius);
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-banner h1 {
  color: white;
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  position: relative;
  z-index: 1;
  border: none;
}

.hero-banner .subtitle {
  font-size: 1.3rem;
  font-weight: 300;
  opacity: 0.92;
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.hero-banner p {
  font-size: 1.05rem;
  opacity: 0.88;
  max-width: 650px;
  position: relative;
  z-index: 1;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
  flex-wrap: wrap;
}

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

.hero-stat .number {
  font-size: 2rem;
  font-weight: 800;
  display: block;
}

.hero-stat .label {
  font-size: 0.85rem;
  opacity: 0.85;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---- Cartes modules ---- */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.module-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.module-card.niveau-debutant::before { background: linear-gradient(90deg, var(--success), #48bb78); }
.module-card.niveau-intermediaire::before { background: linear-gradient(90deg, var(--info), #63b3ed); }
.module-card.niveau-avance::before { background: linear-gradient(90deg, var(--purple), #b794f4); }
.module-card.niveau-tous::before { background: linear-gradient(90deg, var(--accent), #f6ad55); }

.module-card .module-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: white;
}

.module-card.niveau-debutant .module-number { background: var(--success); }
.module-card.niveau-intermediaire .module-number { background: var(--info); }
.module-card.niveau-avance .module-number { background: var(--purple); }
.module-card.niveau-tous .module-number { background: var(--accent); }

.module-card .module-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.module-card .module-title a {
  color: inherit;
  text-decoration: none;
}

.module-card .module-title a:hover {
  color: var(--primary-light);
}

.module-card .module-meta {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.module-card .badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

.badge-duree {
  background: var(--gray-100);
  color: var(--gray-700);
}

.badge-niveau-debutant {
  background: var(--success-light);
  color: #276749;
}

.badge-niveau-intermediaire {
  background: var(--info-light);
  color: #2a4365;
}

.badge-niveau-avance {
  background: var(--purple-light);
  color: #553c9a;
}

.badge-niveau-tous {
  background: var(--accent-light);
  color: #9c4221;
}

.module-card .module-links {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--gray-100);
}

.module-card .module-links a {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.8rem;
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition);
}

.module-card .module-links a.link-cours {
  background: var(--primary);
  color: white;
}
.module-card .module-links a.link-cours:hover {
  background: var(--primary-light);
}

.module-card .module-links a.link-slides {
  background: var(--gray-100);
  color: var(--gray-700);
}
.module-card .module-links a.link-slides:hover {
  background: var(--gray-200);
}

.module-card .module-links a.link-tp {
  background: var(--accent-light);
  color: #9c4221;
}
.module-card .module-links a.link-tp:hover {
  background: var(--accent);
  color: white;
}

/* ---- Section features (accueil) ---- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2.5rem;
}

.feature-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  text-align: center;
  transition: var(--transition);
}

.feature-card:hover {
  background: white;
  box-shadow: var(--shadow);
}

.feature-card .feature-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  display: block;
}

.feature-card .feature-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--primary);
  margin-bottom: 0.3rem;
}

.feature-card .feature-desc {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.4;
}

/* ---- Info boxes (accueil) ---- */
.info-box {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.info-box h3 {
  margin-top: 0;
}

/* ---- Callouts améliorés ---- */
div.callout {
  border-radius: var(--radius-sm) !important;
  border-left-width: 5px !important;
  box-shadow: var(--shadow) !important;
  margin: 1.5rem 0 !important;
}

div.callout-note {
  background: linear-gradient(135deg, #ebf8ff 0%, #f0f9ff 100%) !important;
  border-left-color: var(--info) !important;
}

div.callout-tip {
  background: linear-gradient(135deg, #f0fff4 0%, #f0fdf4 100%) !important;
  border-left-color: var(--success) !important;
}

div.callout-warning {
  background: linear-gradient(135deg, #fffff0 0%, #fefce8 100%) !important;
  border-left-color: var(--accent) !important;
}

div.callout-important {
  background: linear-gradient(135deg, #fff5f5 0%, #fef2f2 100%) !important;
  border-left-color: var(--danger) !important;
}

div.callout-caution {
  background: linear-gradient(135deg, #faf5ff 0%, #f5f3ff 100%) !important;
  border-left-color: var(--purple) !important;
}

/* ---- Code blocks ---- */
div.sourceCode {
  border-radius: var(--radius-sm) !important;
  border: 1px solid var(--gray-200) !important;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.06) !important;
  margin: 1.2rem 0 !important;
}

pre.sourceCode {
  font-size: 0.88rem !important;
  line-height: 1.6 !important;
  padding: 1rem 1.2rem !important;
}

code {
  font-size: 0.88em;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  background: var(--gray-100);
  color: var(--danger);
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
}

/* ---- Tableaux ---- */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.5rem 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 0.92rem;
}

thead th {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white !important;
  padding: 0.85rem 1rem;
  font-weight: 600;
  text-align: left;
  letter-spacing: 0.02em;
  border: none;
}

tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--gray-100);
}

tbody tr {
  transition: var(--transition);
}

tbody tr:hover {
  background: var(--gray-50);
}

tbody tr:last-child td {
  border-bottom: none;
}

/* ---- Sidebar ---- */
.sidebar {
  border-right: 1px solid var(--gray-200) !important;
  background: linear-gradient(180deg, #f8fafc 0%, #edf2f7 100%) !important;
  padding-top: 0.5rem !important;
}

.sidebar .sidebar-title {
  font-size: 1.1rem !important;
  font-weight: 700 !important;
  color: var(--primary) !important;
  letter-spacing: -0.01em;
  padding: 0.75rem 1rem 0.5rem !important;
}

.sidebar .sidebar-item .sidebar-item-text {
  font-size: 0.85rem;
  transition: var(--transition);
}

/* Section headers (module names) */
.sidebar .sidebar-item-section .sidebar-item-text {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--gray-800);
}

/* Category labels (FONDAMENTAUX, INFÉRENCE, etc.) */
.sidebar .sidebar-item > .sidebar-item-text:not(a .sidebar-item-text) {
  font-size: 0.7rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.12em !important;
  color: var(--gray-600) !important;
  text-transform: uppercase;
  padding: 0.6rem 1rem 0.15rem !important;
  margin-top: 0.25rem;
}

/* Horizontal dividers */
.sidebar hr {
  border: none;
  border-top: 1px solid var(--gray-200);
  margin: 0.5rem 1rem;
}

/* Sub-items (Cours, Slides, TP) */
.sidebar .sidebar-item-container {
  border-radius: var(--radius-sm);
  margin: 2px 0.5rem;
  transition: var(--transition);
}

.sidebar .sidebar-item-container:hover {
  background: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  transform: translateX(2px);
}

.sidebar .sidebar-item-container .sidebar-item-text {
  padding: 0.3rem 0.6rem !important;
}

/* Active item */
.sidebar .sidebar-item-container.active {
  background: var(--primary);
  box-shadow: 0 2px 8px rgba(26, 54, 93, 0.3);
}

.sidebar .sidebar-item-container.active .sidebar-item-text {
  color: white;
  font-weight: 600;
}

/* Collapsed/expanded section toggle */
.sidebar .sidebar-item-section > .sidebar-item-container {
  border-radius: var(--radius-sm);
  margin: 2px 0.25rem;
  padding: 0.15rem 0.25rem;
}

.sidebar .sidebar-item-section > .sidebar-item-container:hover {
  background: var(--primary-lighter);
}

/* Search box */
.sidebar .sidebar-search {
  margin: 0.5rem 0.75rem;
  border-radius: var(--radius-sm) !important;
}

.sidebar .sidebar-search input {
  border-radius: var(--radius-sm) !important;
  border: 1px solid var(--gray-300) !important;
  font-size: 0.85rem !important;
  padding: 0.5rem 0.75rem !important;
  transition: var(--transition);
}

.sidebar .sidebar-search input:focus {
  border-color: var(--primary-light) !important;
  box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.15) !important;
}

/* ---- Footer ---- */
.nav-footer {
  background: var(--gray-900) !important;
  color: var(--gray-300) !important;
  padding: 1.5rem 0 !important;
  margin-top: 3rem;
}

/* ---- Table des matières ---- */
.sidebar.toc-left {
  border-left: 2px solid var(--gray-200);
}

nav[role=doc-toc] a {
  font-size: 0.85rem;
  color: var(--gray-600);
  transition: var(--transition);
}

nav[role=doc-toc] a:hover {
  color: var(--primary-light);
}

nav[role=doc-toc] a.active {
  color: var(--primary);
  font-weight: 600;
  border-left: 3px solid var(--primary);
  padding-left: 0.5rem;
}

/* ---- Page content ---- */
.content {
  max-width: 900px;
}

/* ---- Formules mathématiques ---- */
.MathJax {
  font-size: 1.05em !important;
}

/* ---- Liens ---- */
a {
  color: var(--primary-light);
  transition: var(--transition);
}

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

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero-banner {
    padding: 2rem 1.5rem;
  }

  .hero-banner h1 {
    font-size: 1.8rem;
  }

  .hero-stats {
    gap: 1rem;
  }

  .hero-stat .number {
    font-size: 1.5rem;
  }

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

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Pages de modules — Header, nav, objectifs
   ============================================ */

/* ---- Module header banner ---- */
.module-header {
  border-radius: var(--radius);
  padding: 2rem 2rem 1.5rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
  color: white;
}

.module-header::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.module-header.header-debutant { background: linear-gradient(135deg, #276749 0%, #38a169 60%, #48bb78 100%); }
.module-header.header-intermediaire { background: linear-gradient(135deg, #2a4365 0%, #3182ce 60%, #4299e1 100%); }
.module-header.header-avance { background: linear-gradient(135deg, #44337a 0%, #805ad5 60%, #9f7aea 100%); }
.module-header.header-tous { background: linear-gradient(135deg, #9c4221 0%, #ed8936 60%, #f6ad55 100%); }

.module-header .module-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.85;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.module-header h2 {
  color: white !important;
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 0.3rem 0;
  border: none !important;
  padding: 0;
}

.module-header .module-subtitle {
  font-size: 1rem;
  opacity: 0.9;
  font-weight: 300;
  margin-bottom: 1rem;
}

.module-header .module-badges {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.module-header .header-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(4px);
  color: white;
  letter-spacing: 0.02em;
}

/* ---- Navigation intra-module (Cours / Slides / TP) ---- */
.module-nav-tabs {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.module-nav-tabs a {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.35rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition);
  color: white;
  background: rgba(255,255,255,0.15);
}

.module-nav-tabs a:hover {
  background: rgba(255,255,255,0.3);
  color: white;
}

.module-nav-tabs a.active-tab {
  background: white;
  color: var(--primary);
}

/* ---- Objectifs pédagogiques ---- */
.objectifs-box {
  background: linear-gradient(135deg, #ebf8ff 0%, #f0f9ff 100%);
  border: 1px solid var(--info-light);
  border-left: 5px solid var(--info);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 0 0 2rem 0;
}

.objectifs-box h3 {
  color: var(--primary) !important;
  font-size: 1rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.objectifs-box ol, .objectifs-box ul {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

.objectifs-box li {
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

/* ---- Navigation entre modules (bas de page) ---- */
.module-pagination {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--gray-200);
}

.module-pagination a {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
  border: 1px solid var(--gray-200);
  background: white;
  min-width: 0;
  flex: 1;
}

.module-pagination a:hover {
  border-color: var(--primary-lighter);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.module-pagination a.prev {
  text-align: left;
}

.module-pagination a.next {
  text-align: right;
}

.module-pagination .nav-direction {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-600);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.module-pagination .nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary);
}

/* ---- TP: exercice numbering ---- */
.tp-section {
  counter-reset: exercice;
}

/* ---- Sections améliorées ---- */
.content-section {
  margin-bottom: 2.5rem;
}

/* ---- Print ---- */
@media print {
  .hero-banner {
    background: var(--primary) !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .module-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}