/* ============================================================
   Pratique du calcul scientifique — modern theme styles
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap");

:root {
  --casc-primary: #1f5fa8;
  --casc-primary-dark: #14457e;
  --casc-primary-light: #e8f1fb;
  --casc-accent: #f4a261;
  --casc-accent-soft: #fff4e6;
  --casc-fr: #2a9d8f;
  --casc-fr-soft: #e6f6f3;
  --casc-en: #6f4ec9;
  --casc-en-soft: #efe9fb;
  --casc-card-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
  --casc-card-shadow-hover: 0 14px 28px rgba(15, 23, 42, 0.14);
  --casc-deadline: #c0392b;
  --casc-deadline-soft: #fdf2f2;
  --casc-radius: 14px;
  --casc-radius-sm: 10px;
}

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.005em;
}

.navbar {
  --bs-navbar-padding-y: 0.5rem;
}

.navbar-brand {
  padding-top: 0;
  padding-bottom: 0;
}

.navbar-brand img,
.navbar-logo {
  max-height: 32px;
}

code, pre, .sourceCode {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace !important;
}

/* ============================================================
   Hero section (homepage)
   ============================================================ */

.casc-hero {
  position: relative;
  margin: 0 -1rem 2.5rem -1rem;
  padding: 1.35rem 2rem 1.65rem 2rem;
  border-radius: var(--casc-radius);
  background: linear-gradient(135deg, #1f5fa8 0%, #2980d4 50%, #4cc9f0 100%);
  color: #ffffff;
  overflow: hidden;
  box-shadow: var(--casc-card-shadow);
}

.casc-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(255,255,255,0.15) 0%, transparent 40%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.18) 0%, transparent 35%);
  pointer-events: none;
}

.casc-hero-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.casc-hero-content {
  flex: 1;
  min-width: 0;
  max-width: 820px;
}

.casc-hero-logos {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1.5rem;
  flex-shrink: 0;
  margin-right: -2rem;
}

.casc-hero-logos p {
  margin: 0;
}

.casc-hero-logo-enpc {
  width: 250px;
  opacity: 1.00;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.18));
}

.casc-hero-logo-course {
  width: 250px;
  opacity: 1.00;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.18));
}

@media (max-width: 768px) {
  .casc-hero-logos {
    display: none;
  }
}

.casc-hero h1 {
  color: #ffffff !important;
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 0.6rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.casc-hero .casc-hero-subtitle {
  font-size: 1.1rem;
  font-weight: 400;
  opacity: 0.95;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.casc-hero .casc-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

.casc-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #ffffff;
  backdrop-filter: blur(6px);
}

.casc-hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.casc-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none !important;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  border: 1px solid transparent;
}

.casc-btn-primary {
  background: #ffffff;
  color: var(--casc-primary) !important;
}
.casc-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(0,0,0,0.18);
  color: var(--casc-primary-dark) !important;
}

.casc-btn-ghost {
  background: rgba(255,255,255,0.12);
  color: #ffffff !important;
  border-color: rgba(255,255,255,0.4);
  backdrop-filter: blur(6px);
}
.casc-btn-ghost:hover {
  background: rgba(255,255,255,0.22);
  transform: translateY(-2px);
}

/* ============================================================
   Section headers
   ============================================================ */

.casc-section-title {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 2.8rem;
  margin-bottom: 0.8rem;
  border: none;
}

.casc-section-title::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 1.4rem;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--casc-primary), var(--casc-accent));
}

/* ============================================================
   Card grid (Quarto .grid friendly)
   ============================================================ */

.casc-card {
  display: block;
  height: 100%;
  padding: 1.5rem 1.4rem;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: var(--casc-radius);
  box-shadow: var(--casc-card-shadow);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  text-decoration: none !important;
  color: inherit !important;
  position: relative;
  overflow: hidden;
}

.casc-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--casc-card-shadow-hover);
  border-color: rgba(31, 95, 168, 0.25);
}

.casc-card .casc-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--casc-primary-light);
  color: var(--casc-primary);
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
}

.casc-card h3 {
  font-size: 1.15rem;
  margin: 0 0 0.4rem 0;
  font-weight: 700;
}

.casc-card p {
  margin: 0;
  font-size: 0.94rem;
  color: #475569;
  line-height: 1.5;
}

.casc-card ul {
  margin: 0.4rem 0 0 0;
  padding-left: 1.1rem;
  font-size: 0.92rem;
  color: #475569;
}

.casc-card ul li { margin-bottom: 0.2rem; }

/* Card-link: the h3 title is an anchor whose ::after covers the whole card.
   Usage: ### [Title](url){.casc-card-link target="_blank" rel="noopener"} */
.casc-card h3 .casc-card-link {
  color: inherit !important;
  text-decoration: none !important;
}

.casc-card h3 .casc-card-link::after {
  content: none !important;
}

/* ============================================================
   Course / Notebook tables
   ============================================================ */

.casc-table-wrapper {
  margin: 1rem 0 2rem 0;
  border-radius: var(--casc-radius);
  box-shadow: var(--casc-card-shadow);
  overflow: hidden;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.05);
}

table.casc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
  font-size: 0.95rem;
  --bs-table-bg: transparent;
  --bs-table-color: inherit;
  --bs-table-border-color: transparent;
  --bs-table-striped-bg: transparent;
  --bs-table-hover-bg: transparent;
}

table.casc-table > :not(caption) > * > * {
  background: transparent;
  box-shadow: none;
  border-bottom-width: 0;
}

table.casc-table thead {
  background: linear-gradient(135deg, var(--casc-primary) 0%, #2980d4 100%);
  color: #ffffff;
}

table.casc-table thead th {
  padding: 0.95rem 1.1rem;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.02em;
  font-size: 0.85rem;
  text-transform: uppercase;
  border: none;
}

table.casc-table tbody tr {
  border-top: 1px solid rgba(15, 23, 42, 0.06);
  transition: background 0.15s ease;
}

table.casc-table tbody tr:hover {
  background: rgba(31, 95, 168, 0.04);
}

table.casc-table tbody td {
  padding: 0.95rem 1.1rem;
  vertical-align: middle;
  border: none;
}

table.casc-table tbody td.casc-topic {
  font-weight: 600;
  color: #0f172a;
}

/* Week badge */
.casc-week-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.4rem;
  height: 2.4rem;
  padding: 0 0.7rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--casc-primary-light);
  color: var(--casc-primary);
  letter-spacing: 0.02em;
}

/* Language buttons */
.casc-lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.86rem;
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.casc-lang-btn.fr {
  background: var(--casc-fr-soft);
  color: var(--casc-fr) !important;
  border-color: rgba(42, 157, 143, 0.25);
}
.casc-lang-btn.fr:hover {
  background: var(--casc-fr);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(42, 157, 143, 0.3);
}

.casc-lang-btn.en {
  background: var(--casc-en-soft);
  color: var(--casc-en) !important;
  border-color: rgba(111, 78, 201, 0.25);
}
.casc-lang-btn.en:hover {
  background: var(--casc-en);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(111, 78, 201, 0.3);
}

.casc-lang-btn.disabled {
  background: #f1f5f9;
  color: #94a3b8 !important;
  border-color: #e2e8f0;
  cursor: not-allowed;
  pointer-events: none;
}

/* Action / link buttons inside table */
.casc-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.86rem;
  text-decoration: none !important;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.casc-action-btn.primary {
  background: var(--casc-primary-light);
  color: var(--casc-primary) !important;
  border-color: rgba(31, 95, 168, 0.2);
}
.casc-action-btn.primary:hover {
  background: var(--casc-primary);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(31, 95, 168, 0.3);
}

.casc-action-btn.accent {
  background: var(--casc-accent-soft);
  color: #b46b29 !important;
  border-color: rgba(244, 162, 97, 0.3);
}
.casc-action-btn.accent:hover {
  background: var(--casc-accent);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(244, 162, 97, 0.35);
}

.casc-action-btn.ghost {
  background: transparent;
  color: #475569 !important;
  border-color: #cbd5e1;
}
.casc-action-btn.ghost:hover {
  background: #f1f5f9;
  color: #0f172a !important;
}

/* ============================================================
   Chapter grid (poly page)
   ============================================================ */

.casc-chapter-card {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: var(--casc-radius-sm);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.05);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  text-decoration: none !important;
  color: inherit !important;
  height: 100%;
}

.casc-chapter-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--casc-card-shadow);
  border-color: var(--casc-primary);
}

.casc-chapter-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--casc-primary) 0%, #4cc9f0 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
}

.casc-chapter-num.appendix {
  background: linear-gradient(135deg, var(--casc-accent) 0%, #ffd166 100%);
}

.casc-chapter-title {
  font-weight: 600;
  font-size: 0.97rem;
  line-height: 1.3;
  color: #0f172a;
}

/* ============================================================
   Callouts / info banner
   ============================================================ */

.casc-info-banner {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  padding: 1rem 1.2rem;
  background: var(--casc-primary-light);
  border-left: 4px solid var(--casc-primary);
  border-radius: var(--casc-radius-sm);
  margin: 1rem 0 1.5rem 0;
  color: #0f172a;
}

.casc-info-banner i { color: var(--casc-primary); font-size: 1.1rem; margin-top: 0.15rem; }

/* ============================================================
   Dark mode adjustments
   ============================================================ */

[data-bs-theme="dark"] .casc-card,
.quarto-dark .casc-card {
  background: #1e293b;
  border-color: rgba(255,255,255,0.06);
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
}
[data-bs-theme="dark"] .casc-card p,
[data-bs-theme="dark"] .casc-card ul,
.quarto-dark .casc-card p,
.quarto-dark .casc-card ul { color: #cbd5e1; }
[data-bs-theme="dark"] .casc-card .casc-card-icon,
.quarto-dark .casc-card .casc-card-icon {
  background: rgba(76, 155, 227, 0.15);
  color: #7bb8f0;
}

[data-bs-theme="dark"] .casc-table-wrapper,
.quarto-dark .casc-table-wrapper {
  background: #1e293b;
  border-color: rgba(255,255,255,0.06);
}
[data-bs-theme="dark"] table.casc-table tbody tr,
.quarto-dark table.casc-table tbody tr {
  border-top-color: rgba(255,255,255,0.06);
}
[data-bs-theme="dark"] table.casc-table tbody tr:hover,
.quarto-dark table.casc-table tbody tr:hover {
  background: rgba(76, 155, 227, 0.08);
}
[data-bs-theme="dark"] table.casc-table tbody td.casc-topic,
.quarto-dark table.casc-table tbody td.casc-topic {
  color: #f1f5f9;
}
[data-bs-theme="dark"] .casc-week-badge,
.quarto-dark .casc-week-badge {
  background: rgba(76, 155, 227, 0.15);
  color: #7bb8f0;
}

[data-bs-theme="dark"] .casc-chapter-card,
.quarto-dark .casc-chapter-card {
  background: #1e293b;
  border-color: rgba(255,255,255,0.06);
}
[data-bs-theme="dark"] .casc-chapter-title,
.quarto-dark .casc-chapter-title { color: #f1f5f9; }

[data-bs-theme="dark"] .casc-info-banner,
.quarto-dark .casc-info-banner {
  background: rgba(76, 155, 227, 0.1);
  color: #e5e7eb;
}

[data-bs-theme="dark"] .casc-action-btn.ghost,
.quarto-dark .casc-action-btn.ghost {
  color: #cbd5e1 !important;
  border-color: #334155;
}
[data-bs-theme="dark"] .casc-action-btn.ghost:hover,
.quarto-dark .casc-action-btn.ghost:hover {
  background: #334155;
  color: #f1f5f9 !important;
}

/* ============================================================
   Markdown-sourced styled tables
   (.casc-course-table, .casc-notebook-table, .casc-archive-table)
   Tables are written as plain Markdown; CSS does all the styling.
   ============================================================ */

.casc-course-table,
.casc-notebook-table,
.casc-archive-table {
  margin: 1rem 0 2rem 0;
  border-radius: var(--casc-radius);
  box-shadow: var(--casc-card-shadow);
  overflow: hidden;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.05);
}

.casc-course-table table,
.casc-notebook-table table,
.casc-archive-table table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
  font-size: 0.95rem;
  --bs-table-bg: transparent;
  --bs-table-color: inherit;
  --bs-table-border-color: transparent;
  --bs-table-striped-bg: transparent;
  --bs-table-hover-bg: transparent;
}

.casc-course-table table > :not(caption) > * > *,
.casc-notebook-table table > :not(caption) > * > *,
.casc-archive-table table > :not(caption) > * > * {
  background: transparent;
  box-shadow: none;
  border-bottom-width: 0;
}

.casc-course-table table thead,
.casc-notebook-table table thead,
.casc-archive-table table thead {
  background: linear-gradient(135deg, var(--casc-primary) 0%, #2980d4 100%);
  color: #ffffff;
}

.casc-course-table table thead th,
.casc-notebook-table table thead th,
.casc-archive-table table thead th {
  padding: 0.95rem 1.1rem;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.02em;
  font-size: 0.85rem;
  text-transform: uppercase;
  border: none;
  color: #ffffff;
}

.casc-course-table table tbody tr,
.casc-notebook-table table tbody tr,
.casc-archive-table table tbody tr {
  border-top: 1px solid rgba(15, 23, 42, 0.06);
  transition: background 0.15s ease;
}

.casc-course-table table tbody tr:hover,
.casc-notebook-table table tbody tr:hover,
.casc-archive-table table tbody tr:hover {
  background: rgba(31, 95, 168, 0.04);
}

.casc-course-table table tbody td,
.casc-notebook-table table tbody td,
.casc-archive-table table tbody td {
  padding: 0.8rem 1.1rem;
  vertical-align: middle;
  border: none;
}

/* Col 2 : subject — bold */
.casc-course-table table tbody td:nth-child(2),
.casc-notebook-table table tbody td:nth-child(2),
.casc-archive-table table tbody td:nth-child(2) {
  font-weight: 600;
  color: #0f172a;
}

/* Shared button base for all action links inside these tables */
.casc-course-table table tbody td:nth-child(n+3) a,
.casc-notebook-table table tbody td:nth-child(n+3) a,
.casc-archive-table table tbody td:nth-child(n+3) a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.42rem 0.88rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.86rem;
  text-decoration: none !important;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}

/* Course table — col 3 = FR (green), col 4 = EN (purple) */
.casc-course-table table tbody td:nth-child(3) a {
  background: var(--casc-fr-soft);
  color: var(--casc-fr) !important;
  border-color: rgba(42, 157, 143, 0.25);
}
.casc-course-table table tbody td:nth-child(3) a:hover {
  background: var(--casc-fr);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(42, 157, 143, 0.3);
}
.casc-course-table table tbody td:nth-child(4) a {
  background: var(--casc-en-soft);
  color: var(--casc-en) !important;
  border-color: rgba(111, 78, 201, 0.25);
}
.casc-course-table table tbody td:nth-child(4) a:hover {
  background: var(--casc-en);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(111, 78, 201, 0.3);
}

/* Notebook table — col 3 = énoncé (blue), col 4 = solution (accent), col 5 = soumission · deadline (purple) */
.casc-notebook-table table tbody td:nth-child(3) a {
  background: var(--casc-primary-light);
  color: var(--casc-primary) !important;
  border-color: rgba(31, 95, 168, 0.2);
}
.casc-notebook-table table tbody td:nth-child(3) a:hover {
  background: var(--casc-primary);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(31, 95, 168, 0.3);
}
.casc-notebook-table table tbody td:nth-child(4) a {
  background: var(--casc-accent-soft);
  color: #b46b29 !important;
  border-color: rgba(244, 162, 97, 0.3);
}
.casc-notebook-table table tbody td:nth-child(4) a:hover {
  background: var(--casc-accent);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(244, 162, 97, 0.35);
}
.casc-notebook-table table tbody td:nth-child(5) a {
  background: var(--casc-en-soft);
  color: var(--casc-en) !important;
  border-color: rgba(111, 78, 201, 0.25);
}
.casc-notebook-table table tbody td:nth-child(5) a:hover {
  background: var(--casc-en);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(111, 78, 201, 0.3);
}

/* Notebook table — col 1 : pas de retour à la ligne (badge semaine) */
.casc-notebook-table table tbody td:nth-child(1) {
  white-space: nowrap;
}

/* Tooltip calendrier au survol de la deadline */
.casc-deadline {
  cursor: help;
}

.casc-deadline-tooltip {
  position: fixed;
  z-index: 1000;
  width: 170px;
  border-radius: 14px;
  background: #ffffff;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  font-family: "Inter", system-ui, sans-serif;
  pointer-events: none;
}

.casc-dtl-header {
  background: var(--casc-deadline);
  color: #ffffff;
  text-align: center;
  padding: 0.6rem 1rem;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: capitalize;
  letter-spacing: 0.02em;
}

.casc-dtl-body {
  padding: 1rem;
  text-align: center;
}

.casc-dtl-day {
  font-size: 2.5rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1.1;
}

.casc-dtl-time {
  font-size: 0.85rem;
  color: #64748b;
  margin-top: 0.2rem;
  font-weight: 500;
}

.casc-dtl-divider {
  height: 1px;
  background: #e2e8f0;
  margin: 0.7rem 0;
}

.casc-dtl-countdown {
  font-size: 0.82rem;
  font-weight: 600;
  color: #0f172a;
  font-variant-numeric: tabular-nums;
}

.casc-dtl-safe { color: #2a9d8f; }
.casc-dtl-warning { color: #e67e22; }
.casc-dtl-critical { color: #c0392b; }
.casc-dtl-expired { color: #94a3b8; }

/* Dark mode */
[data-bs-theme="dark"] .casc-deadline-tooltip,
.quarto-dark .casc-deadline-tooltip {
  background: #1e293b;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}
[data-bs-theme="dark"] .casc-dtl-day,
.quarto-dark .casc-dtl-day {
  color: #f1f5f9;
}
[data-bs-theme="dark"] .casc-dtl-time,
.quarto-dark .casc-dtl-time {
  color: #94a3b8;
}
[data-bs-theme="dark"] .casc-dtl-divider,
.quarto-dark .casc-dtl-divider {
  background: #334155;
}
[data-bs-theme="dark"] .casc-dtl-countdown,
.quarto-dark .casc-dtl-countdown {
  color: #f1f5f9;
}

/* Archive table — col 3 = énoncé (blue), col 4 = solution (accent) */
.casc-archive-table table tbody td:nth-child(3) a {
  background: var(--casc-primary-light);
  color: var(--casc-primary) !important;
  border-color: rgba(31, 95, 168, 0.2);
}
.casc-archive-table table tbody td:nth-child(3) a:hover {
  background: var(--casc-primary);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(31, 95, 168, 0.3);
}
.casc-archive-table table tbody td:nth-child(4) a {
  background: var(--casc-accent-soft);
  color: #b46b29 !important;
  border-color: rgba(244, 162, 97, 0.3);
}
.casc-archive-table table tbody td:nth-child(4) a:hover {
  background: var(--casc-accent);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(244, 162, 97, 0.35);
}

/* "à venir" ghost span */
.casc-action-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.42rem 0.88rem;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 500;
  background: #f1f5f9;
  color: #94a3b8;
  border: 1px solid #e2e8f0;
}

/* Dark mode for markdown tables */
[data-bs-theme="dark"] .casc-course-table,
[data-bs-theme="dark"] .casc-notebook-table,
[data-bs-theme="dark"] .casc-archive-table,
.quarto-dark .casc-course-table,
.quarto-dark .casc-notebook-table,
.quarto-dark .casc-archive-table {
  background: #1e293b;
  border-color: rgba(255,255,255,0.06);
}
[data-bs-theme="dark"] .casc-course-table table tbody tr,
[data-bs-theme="dark"] .casc-notebook-table table tbody tr,
[data-bs-theme="dark"] .casc-archive-table table tbody tr,
.quarto-dark .casc-course-table table tbody tr,
.quarto-dark .casc-notebook-table table tbody tr,
.quarto-dark .casc-archive-table table tbody tr {
  border-top-color: rgba(255,255,255,0.06);
}
[data-bs-theme="dark"] .casc-course-table table tbody tr:hover,
[data-bs-theme="dark"] .casc-notebook-table table tbody tr:hover,
[data-bs-theme="dark"] .casc-archive-table table tbody tr:hover,
.quarto-dark .casc-course-table table tbody tr:hover,
.quarto-dark .casc-notebook-table table tbody tr:hover,
.quarto-dark .casc-archive-table table tbody tr:hover {
  background: rgba(76, 155, 227, 0.08);
}
[data-bs-theme="dark"] .casc-course-table table tbody td:nth-child(2),
[data-bs-theme="dark"] .casc-notebook-table table tbody td:nth-child(2),
[data-bs-theme="dark"] .casc-archive-table table tbody td:nth-child(2),
.quarto-dark .casc-course-table table tbody td:nth-child(2),
.quarto-dark .casc-notebook-table table tbody td:nth-child(2),
.quarto-dark .casc-archive-table table tbody td:nth-child(2) {
  color: #f1f5f9;
}
[data-bs-theme="dark"] .casc-action-ghost,
.quarto-dark .casc-action-ghost {
  background: #334155;
  color: #64748b;
  border-color: #475569;
}

/* ============================================================
   Chapter grid (poly.qmd) — Markdown list styled as 2-col grid
   Usage: ::: {.casc-chapters-grid}
          - [**0** Introduction](url)
          :::
   ============================================================ */

.casc-chapters-grid ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.55rem;
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 1.5rem 0;
}

.casc-chapters-grid ul li {
  margin: 0;
  padding: 0;
}

.casc-chapters-grid ul li a {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: var(--casc-radius-sm);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.05);
  text-decoration: none !important;
  color: inherit !important;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.casc-chapters-grid ul li a:hover {
  transform: translateY(-2px);
  box-shadow: var(--casc-card-shadow);
  border-color: rgba(31, 95, 168, 0.3);
}

/* The **number** bold marker becomes the badge */
.casc-chapters-grid ul li a strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-width: 36px;
  height: 36px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--casc-primary) 0%, #4cc9f0 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.9rem;
}

/* .appendix variant — orange badge */
.casc-chapters-grid.appendix ul li a strong {
  background: linear-gradient(135deg, var(--casc-accent) 0%, #ffd166 100%);
}

/* Dark mode for chapter grid */
[data-bs-theme="dark"] .casc-chapters-grid ul li a,
.quarto-dark .casc-chapters-grid ul li a {
  background: #1e293b;
  border-color: rgba(255,255,255,0.06);
  color: #f1f5f9 !important;
}
[data-bs-theme="dark"] .casc-chapters-grid ul li a:hover,
.quarto-dark .casc-chapters-grid ul li a:hover {
  border-color: rgba(76, 155, 227, 0.4);
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 700px) {
  .casc-hero { padding: 2.8rem 1.4rem 3rem 1.4rem; }
  .casc-hero h1 { font-size: 2rem; }
  .casc-hero .casc-hero-subtitle { font-size: 1.05rem; }

  table.casc-table thead th,
  table.casc-table tbody td { padding: 0.7rem 0.7rem; }

  .casc-lang-btn,
  .casc-action-btn { font-size: 0.8rem; padding: 0.4rem 0.7rem; }
}