:root {
  color-scheme: dark;
  --bg: #121214;
  --surface: #1c1c1f;
  --surface-2: #2c2c2f;
  --surface-3: #3a3a3e;
  --dropdown-bg: rgba(28, 28, 30, 0.96);
  --dropdown-shadow: 0 12px 40px rgba(0, 0, 0, 0.55);
  --separator: rgba(255, 255, 255, 0.1);
  --separator-strong: rgba(255, 255, 255, 0.16);
  --border: rgba(255, 255, 255, 0.1);
  --text: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --brand-name: #ffffff;
  --accent: #0a84ff;
  --accent-pressed: #0077ed;
  --success: #30d158;
  --warning: #ffd60a;
  --danger: #ff453a;
  --notice-bg: rgba(255, 159, 10, 0.12);
  --callout-def: #5ac8fa;
  --callout-prop: #30d158;
  --callout-form: #ff8a80;
  --callout-ex: #a1a1a6;
  --callout-err: #ff6b6b;
  --callout-bonus: #64b5f6;
  --radius: 12px;
  --radius-pill: 980px;
  --font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", system-ui, sans-serif;
  --font-brand: "Lalezar", var(--font-ui);
  --font-mono: "SF Mono", "Cascadia Code", Consolas, monospace;
  --font-cover: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --grain-bg: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.6' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0.4 0 0 0 0 0 0.4 0 0 0 0 0 0.4 0 0 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  --site-header-height: 68px;
  --header-h: var(--site-header-height);
  --max-width: 1200px;
  --course-max-width: min(1120px, calc(100vw - 280px));
  --transition: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-cover);
  font-size: 17px;
  line-height: 1.47059;
  letter-spacing: -0.022em;
  color: var(--text);
  background: #000000;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image: var(--grain-bg);
  opacity: 0.6;
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.4em;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

h2 {
  margin-bottom: 0.35em;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h3 {
  margin-bottom: 0.2em;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

p {
  color: var(--text-secondary);
}

.site-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: var(--site-header-height);
}

/* Barre du haut — fixe, dimensions verrouillees (ne pas modifier sans demande explicite). */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--site-header-height);
  min-height: var(--site-header-height);
  max-height: var(--site-header-height);
  padding-inline: max(22px, calc((100% - var(--max-width)) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: linear-gradient(to top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.6));
}

.brand {
  display: inline-flex;
  align-items: center;
  transition: opacity var(--transition);
}

.brand:hover {
  opacity: 0.82;
}

.brand-lockup {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
}

.brand-name {
  font-family: var(--font-brand);
  font-size: clamp(1.35rem, 2.4vw, 1.65rem);
  font-weight: 400;
  line-height: 1;
  color: var(--brand-name);
}

.brand-academy {
  font-family: var(--font-brand);
  font-size: clamp(0.8rem, 1.3vw, 0.95rem);
  font-weight: 400;
  line-height: 1;
  color: var(--text-secondary);
  transform: translateY(0.06em);
}

.site-header-actions {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.admin-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 0.85rem;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.94rem;
  font-weight: 400;
  transition: color var(--transition), background var(--transition);
}

.admin-nav a:hover {
  color: var(--text);
  background: var(--surface-2);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 36px;
  padding: 0 0.85rem;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.94rem;
  font-weight: 400;
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}

.nav-dropdown-caret {
  width: 0;
  height: 0;
  margin-top: 2px;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.7;
}

.nav-dropdown:hover .nav-dropdown-trigger,
.nav-dropdown.is-open .nav-dropdown-trigger,
.nav-dropdown-trigger.is-active {
  color: var(--text);
  background: var(--surface-2);
}

.nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 200;
  min-width: 200px;
  padding: 0.35rem;
  border-radius: var(--radius);
  border: 1px solid var(--separator-strong);
  background: var(--dropdown-bg);
  backdrop-filter: saturate(180%) blur(20px);
  box-shadow: var(--dropdown-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  pointer-events: none;
  transition:
    opacity var(--transition),
    transform var(--transition),
    visibility var(--transition);
}

.nav-dropdown:hover .nav-dropdown-panel,
.nav-dropdown.is-open .nav-dropdown-panel,
.nav-dropdown:focus-within .nav-dropdown-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-dropdown-item {
  display: block;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 400;
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}

.nav-dropdown-item:hover,
.nav-dropdown-item.is-active {
  color: var(--text);
  background: var(--surface-3);
}

.nav-dropdown-empty {
  display: block;
  padding: 0.55rem 0.75rem;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

.nav-dropdown-item-muted {
  color: var(--text-tertiary);
  pointer-events: none;
}

.page {
  flex: 1;
  width: min(var(--max-width), calc(100vw - 3rem));
  max-width: 100%;
  margin: 0;
  padding: 3rem 1.5rem 4.5rem;
  box-sizing: border-box;
}

.page:has(> .course-page) {
  width: min(1100px, calc(100vw - 3rem));
}

.section-label {
  margin-bottom: 0.65rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.admin-header,
.page-title {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.admin-header h1,
.page-title h1 {
  margin-bottom: 0;
}

.text-link,
.back-link {
  color: var(--accent);
  font-size: 0.94rem;
  font-weight: 400;
  transition: opacity var(--transition);
}

.text-link:hover,
.back-link:hover {
  opacity: 0.72;
}

.back-link {
  display: inline-block;
  margin-bottom: 1.25rem;
}

/* ——— Landing ——— */

.landing-cover {
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  margin-top: calc(-3rem - var(--site-header-height));
  margin-bottom: -4.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.landing-cover-title {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0 1.5rem;
  color: #ffffff;
  font-family: var(--font-brand);
  font-weight: 400;
  font-size: clamp(2.25rem, 7vw, 5.5rem);
  letter-spacing: 0;
  text-align: center;
}

.landing-cover-subtitle {
  position: relative;
  z-index: 1;
  margin: 0.5rem 0 0;
  padding: 0 1.5rem;
  color: rgba(255, 255, 255, 0.7);
  font-family: var(--font-cover);
  font-weight: 400;
  font-size: clamp(1rem, 2.2vw, 1.375rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
}

.pill-links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2.5rem;
  padding: 0 1.5rem;
}

.pill-link {
  padding: 0.75rem 1.75rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-pill);
  color: #ffffff;
  font-family: var(--font-cover);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: background var(--transition), border-color var(--transition);
}

.pill-link:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.45);
}

@media (max-width: 640px) {
  .landing-cover {
    margin-top: calc(-2rem - var(--site-header-height));
  }
}

/* ——— Home ——— */

.home-intro {
  margin-bottom: 3rem;
  max-width: 640px;
}

.home-title {
  margin-bottom: 0.35em;
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.home-lead {
  margin: 0;
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  font-weight: 400;
  line-height: 1.4;
  color: var(--text-secondary);
}

.section-picker {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--site-header-height) - 7.5rem);
  text-align: center;
}

.section-picker .home-intro {
  max-width: none;
}

.level-picker-list {
  width: 100%;
  max-width: 420px;
  text-align: left;
}

.course-list.level-picker-list {
  background: rgba(120, 120, 124, 0.3);
  border: 1px solid rgba(160, 160, 164, 0.25);
}

.level-picker-list .course-list-item {
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.level-picker-list .course-list-link:hover {
  background: rgba(120, 120, 124, 0.2);
}

.level-intro {
  max-width: none;
  text-align: left;
}

.level-title {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  text-align: left;
}

.level-lead {
  font-size: 0.95rem;
}

.level-preamble {
  max-width: none;
  margin: 0 0 3rem;
  padding: 0;
  font-family: var(--font-cover);
  font-weight: normal;
  text-align: left;
}

.level-preamble-title {
  margin: 0 0 1.5rem;
  font-family: inherit;
  font-size: 1.25rem;
  font-weight: normal;
  letter-spacing: 0.02em;
  color: var(--text);
  text-align: center;
}

.level-preamble p {
  margin: 0 0 1.15rem;
  color: var(--text);
  font-family: inherit;
  font-size: 1.125rem;
  font-weight: normal;
  line-height: 1.75;
  text-align: justify;
  hyphens: auto;
}

.level-preamble p:last-child {
  margin-bottom: 0;
}

.level-page-with-tracks {
  display: block;
}

.level-track-nav {
  position: fixed;
  top: calc(var(--site-header-height) + 1.5rem);
  left: max(22px, calc(50% - var(--max-width) / 2));
  z-index: 50;
  width: 190px;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.level-page-with-tracks .level-content {
  margin-left: calc(190px + 2.5rem);
  margin-right: auto;
  max-width: var(--course-max-width);
  min-width: 0;
}

.level-track-heading {
  display: block;
  margin-bottom: 0.35rem;
  padding: 0.45rem 0.6rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: color var(--transition), background var(--transition);
}

.level-track-heading:hover {
  background: var(--surface-2);
}

.level-track-heading.is-active {
  background: var(--surface-2);
}

.level-track-link {
  display: block;
  padding: 0.5rem 0.6rem;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.86rem;
  line-height: 1.35;
  transition: color var(--transition), background var(--transition);
}

.level-track-link:hover {
  color: var(--text);
  background: var(--surface-2);
}

.level-track-link.is-active {
  color: var(--text);
  background: var(--surface-2);
}

.course-list-section {
  margin-bottom: 2rem;
}

.course-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.course-list-item {
  border-bottom: 1px solid var(--separator);
}

.course-list-item:last-child {
  border-bottom: none;
}

.course-list-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1.1rem;
  color: var(--text);
  transition: background var(--transition);
}

.course-list-link:hover {
  background: var(--surface-2);
}

.course-list-link h3 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 400;
}

.chapter-domain-title {
  margin: 2rem 0 0.75rem;
  padding: 0 0.1rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.chapter-domain-title:first-child {
  margin-top: 0;
}

.course-list-section .course-list + .chapter-domain-title {
  margin-top: 2rem;
}

.chapter-hub {
  width: 100%;
  max-width: min(720px, 100%);
  margin: 0 auto;
}

.chapter-hub-title {
  margin-bottom: 1.25rem;
  text-align: left;
}

.course-list-link h3 {
  margin: 0;
  flex: 1;
  min-width: 0;
}

.course-list-section .course-list-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.course-list-chevron {
  flex-shrink: 0;
  color: var(--text-tertiary);
  font-size: 1.25rem;
  font-weight: 300;
  line-height: 1;
}

.course-list-link-body {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

.course-list-link-body h3 {
  margin: 0;
}

.chapter-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chapter-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

/* ——— Page cours (plein texte, sans carte) ——— */

.course-page {
  width: 100%;
  margin: 0 auto 4rem;
  padding: 0;
  font-family: var(--font-cover);
}

.course-page-with-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(200px, 260px);
  gap: 2.5rem 3rem;
  align-items: start;
  width: 100%;
}

.course-page-with-sidebar .course-document {
  max-width: none;
}

.course-page-with-sidebar .course-sidebar {
  margin-top: 2.5rem;
  padding-top: 0;
  border-top: none;
  position: sticky;
  top: calc(var(--site-header-height) + 1.5rem);
}

.course-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  grid-column: 1 / -1;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  min-width: 0;
  font-size: 0.875rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--text);
}

.breadcrumb-sep {
  color: var(--text-tertiary);
}

.breadcrumb-current {
  color: var(--text);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-download {
  flex-shrink: 0;
  font-family: var(--font-cover);
  font-size: 0.875rem;
  white-space: nowrap;
}

.pdf-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius);
  background: var(--surface);
  font-family: var(--font-cover);
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.pdf-toolbar-zoom {
  display: flex;
  gap: 0.4rem;
}

.pdf-toolbar-zoom button {
  min-height: 28px;
  padding: 0 0.7rem;
  font-size: 0.9375rem;
  line-height: 1;
}

.course-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.course-toc-item a {
  display: block;
  padding: 0.35rem 0.6rem;
  border-left: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.35;
  transition: color var(--transition), border-color var(--transition);
}

.course-toc-item.is-sub a {
  padding-left: 1.35rem;
  font-size: 0.8125rem;
}

.course-toc-item a:hover {
  color: var(--text);
}

.course-toc-item a.is-active {
  border-left-color: var(--accent);
  color: var(--text);
  font-weight: 600;
}

.course-document {
  min-width: 0;
}

.course-pdf-pages {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.course-pdf-pages .pdf-page {
  width: 100%;
  height: auto;
  display: block;
  background: #ffffff;
  border-radius: 4px;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.25);
}

.course-pdf-fallback {
  padding: 2rem;
  text-align: center;
  font-family: var(--font-cover);
}

.course-sidebar {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-cover);
}

.course-sidebar-block + .course-sidebar-block {
  margin-top: 1.25rem;
}

.course-tex-body {
  color: var(--text);
  font-size: 1.125rem;
  font-weight: normal;
  line-height: 1.75;
  text-align: justify;
  hyphens: auto;
}

.course-tex-body mjx-container {
  color: var(--text);
}

.course-tex-body .tex-doc-header {
  margin: 0 0 2rem;
  text-align: center;
}

.course-tex-body .tex-doc-title {
  margin: 0 0 0.35rem;
  font-family: inherit;
  font-size: 2rem;
  font-weight: normal;
  letter-spacing: 0.02em;
  color: var(--text);
  text-align: center;
}

.course-tex-body .tex-doc-subtitle {
  margin: 0 0 0.75rem;
  font-family: inherit;
  font-size: 1.125rem;
  font-weight: normal;
  color: var(--text-secondary);
  text-align: center;
}

.course-tex-body .tex-rule {
  margin: 0.75rem auto 0;
  border: none;
  border-top: 1px solid var(--border);
  width: min(80%, 20rem);
}

.course-tex-body .tex-section {
  margin: 2.25rem 0 0.85rem;
  font-family: inherit;
  font-size: 1.25rem;
  font-weight: normal;
  color: var(--text);
  text-align: left;
}

.course-tex-body .tex-subsection {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.0625rem;
  font-weight: 600;
  text-align: left;
}

.course-tex-body p {
  margin: 0 0 1.1rem;
  color: var(--text);
}

.course-tex-body .tex-callout {
  margin: 1.35rem 0;
  padding: 0;
  border: none;
  background: none;
}

.course-tex-body .tex-callout-label {
  margin: 0 0 0.35rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-style: italic;
  color: var(--text-secondary);
  text-align: left;
}

.course-tex-body .tex-defbox .tex-callout-label { color: var(--callout-def); }
.course-tex-body .tex-propbox .tex-callout-label { color: var(--callout-prop); }
.course-tex-body .tex-formbox .tex-callout-label { color: var(--callout-form); }
.course-tex-body .tex-exbox .tex-callout-label { color: var(--callout-ex); }
.course-tex-body .tex-errbox .tex-callout-label { color: var(--callout-err); }
.course-tex-body .tex-bonusbox .tex-callout-label { color: var(--callout-bonus); }

.course-tex-body .tex-subsubsection {
  margin: 1.15rem 0 0.4rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
}

.course-tex-body .tex-caption {
  margin: 0.4rem 0 1.2rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
}

.course-tex-body .tex-callout-body {
  margin: 0;
  padding: 0;
}

.course-tex-body .tex-callout-body p:last-child {
  margin-bottom: 0;
}

.course-tex-body .tex-list {
  margin: 0.5rem 0 1.1rem 1.35rem;
  text-align: left;
}

.course-tex-body .tex-list li {
  margin-bottom: 0.35rem;
}

.course-tex-body .tex-center {
  margin: 1.25rem 0;
  text-align: center;
}

.course-tex-body .tex-table-wrap {
  margin: 1.25rem 0;
  overflow-x: auto;
  text-align: left;
}

.course-tex-body .tex-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.course-tex-body .tex-table th,
.course-tex-body .tex-table td {
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
}

.course-tex-body .tex-table th {
  font-weight: 600;
}

.course-tex-body strong {
  font-weight: 600;
}

.evolvlabs-document h2,
.evolvlabs-document .sectionHead {
  margin: 2rem 0 0.75rem;
  font-size: 1.35rem;
  font-weight: 600;
}

.evolvlabs-document .framed {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
}

.compile-notice-banner {
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--notice-bg);
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.latex-source-preview {
  margin-top: 1rem;
  padding: 1rem;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.sidebar-card {
  position: sticky;
  top: calc(var(--header-h) + 1.25rem);
  padding: 1.25rem 1.1rem;
  border-radius: var(--radius);
  background: var(--surface);
}

.sidebar-card h2 {
  margin-bottom: 0.5rem;
  font-size: 1.0625rem;
}

.sidebar-card p {
  margin-bottom: 1rem;
  font-size: 0.94rem;
}

.video-block {
  grid-column: 1 / -1;
  padding: 1.25rem 1.1rem;
  border-radius: var(--radius);
  background: var(--surface);
}

.video-frame {
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: 0.85rem;
  overflow: hidden;
  border-radius: var(--radius);
  background: #000;
}

.video-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* ——— Admin ——— */

.admin-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--separator);
}

.panel-heading h2 {
  margin-bottom: 0;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.admin-course-list,
.data-list {
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.admin-course-row,
.data-list article {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  min-height: 56px;
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--separator);
  color: var(--text);
  transition: background var(--transition);
}

.admin-course-row:last-child,
.data-list article:last-child {
  border-bottom: none;
}

.admin-course-row span:last-child,
.data-list article > a {
  color: var(--accent);
  font-size: 0.94rem;
  font-weight: 400;
}

.admin-course-row:hover,
.data-list article:hover {
  background: var(--surface-2);
}

.course-state {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 0.55rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
}

.course-state.published {
  background: rgba(48, 209, 88, 0.16);
  color: var(--success);
}

.course-state.draft {
  background: rgba(255, 214, 10, 0.14);
  color: var(--warning);
}

.admin-layout {
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.admin-form,
.course-form,
.auth-panel {
  display: grid;
  gap: 1.15rem;
  padding: 1.35rem 1.1rem;
  border-radius: var(--radius);
  background: var(--surface);
}

.course-form {
  max-width: 720px;
}

.data-list article {
  grid-template-columns: minmax(0, 1fr) auto;
}

.data-list article h2,
.data-list article p {
  margin-bottom: 0;
}

.data-list article p {
  font-size: 0.94rem;
}

.auth-shell {
  min-height: calc(100vh - var(--header-h) - 6rem);
  display: grid;
  place-items: center;
}

.auth-panel {
  width: min(400px, 100%);
}

.auth-panel h1 {
  font-size: 1.75rem;
}

/* ——— Forms ——— */

form {
  display: grid;
  gap: 1.1rem;
}

label {
  display: grid;
  gap: 0.4rem;
  color: var(--text);
  font-size: 0.94rem;
  font-weight: 400;
}

input,
select,
textarea,
button,
.button {
  font: inherit;
  border-radius: var(--radius);
}

input,
select,
textarea {
  width: 100%;
  border: none;
  background: var(--surface-2);
  color: var(--text);
  padding: 0.75rem 0.85rem;
  transition: background var(--transition);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-tertiary);
}

input::file-selector-button {
  margin-right: 0.75rem;
  padding: 0.35rem 0.7rem;
  border: none;
  border-radius: 6px;
  background: var(--surface-3);
  color: var(--text);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  background: var(--surface-3);
}

textarea {
  min-height: 320px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
}

.small-textarea {
  min-height: 110px;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 44px;
  padding: 0 1.35rem;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 400;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
}

button:hover,
.button:hover {
  background: var(--accent-pressed);
}

button:active,
.button:active {
  opacity: 0.88;
}

.button.secondary {
  background: var(--surface-2);
  color: var(--text);
}

.button.secondary:hover {
  background: var(--surface-3);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.checkbox-row input {
  width: auto;
  accent-color: var(--accent);
}

.logout-form .button.secondary {
  margin-top: 1.5rem;
}

.error {
  margin-bottom: 0;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius);
  background: rgba(255, 69, 58, 0.14);
  color: var(--danger);
  font-size: 0.94rem;
}

.empty-state {
  margin: 0;
  padding: 2.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  text-align: center;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--separator);
}

.empty-state-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text-tertiary);
}

.empty-state-icon svg {
  width: 24px;
  height: 24px;
}

.empty-state-message {
  margin: 0;
  color: var(--text-secondary);
}

.not-found-card {
  max-width: 420px;
  margin: 3rem auto;
  padding: 2.5rem 1.5rem;
  text-align: center;
  border-radius: var(--radius);
  background: var(--surface);
}

.not-found-card p {
  margin-bottom: 1.5rem;
}

/* ——— Admin login ——— */

.auth-body {
  min-height: 100vh;
  background: var(--bg);
}

.auth-page {
  min-height: 100vh;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 2.5rem;
  padding: 2rem 1.5rem;
}

.auth-brand {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.auth-brand-name {
  font-family: var(--font-brand);
  font-size: clamp(2.5rem, 8vw, 3.5rem);
  font-weight: 400;
  line-height: 1;
  color: #ffffff;
}

.auth-brand-academy {
  font-family: var(--font-brand);
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  font-weight: 400;
  line-height: 1;
  color: var(--text-secondary);
}

.auth-page .auth-panel {
  width: min(400px, 100%);
}

/* ——— Admin app ——— */

.admin-body {
  min-height: 100vh;
  background: var(--bg);
}

.admin-topbar {
  height: var(--header-h);
  padding-inline: max(22px, calc((100% - var(--max-width)) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--separator);
  background: rgba(18, 18, 20, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
}

.admin-page {
  width: min(720px, calc(100% - 44px));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.admin-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.admin-toolbar h1 {
  margin: 0;
  font-size: 1.75rem;
}

.button-small {
  min-height: 36px;
  padding: 0 1rem;
  font-size: 0.9rem;
}

.form-hint {
  margin: -0.5rem 0 0;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

.admin-page .course-form {
  max-width: none;
}

@media (max-width: 900px) {
  .level-track-nav {
    position: static;
    left: auto;
    width: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 0.5rem;
  }

  .level-page-with-tracks .level-content {
    margin-left: 0;
    max-width: none;
  }

  .course-page,
  .course-page-with-sidebar {
    max-width: none;
  }

  .course-page-with-sidebar {
    display: block;
  }

  .course-page-with-sidebar .course-sidebar {
    position: static;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
  }

  .lesson-shell,
  .admin-layout {
    grid-template-columns: 1fr;
  }

  .sidebar-card {
    position: static;
  }
}

@media (max-width: 640px) {
  .page {
    width: calc(100% - 32px);
    padding-top: 2rem;
  }

  .site-header {
    padding-inline: 16px;
  }

  .site-nav {
    width: auto;
  }

  .admin-course-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .data-list article {
    grid-template-columns: 1fr;
  }

  .admin-header,
  .page-title {
    align-items: flex-start;
    flex-direction: column;
  }

  .lesson {
    padding-inline: 1.1rem;
  }
}

/* Impression / "Enregistrer en PDF" : on ne garde que le cours. */
@media print {
  .site-header,
  .level-track-nav,
  .course-toolbar,
  .course-sidebar,
  .back-link {
    display: none !important;
  }

  .site-shell,
  .page,
  .level-content,
  .course-page,
  .course-page-with-sidebar,
  .course-document {
    display: block !important;
    margin: 0 !important;
    padding: 0 !important;
    max-width: none !important;
    width: auto !important;
  }

  body {
    background: #ffffff !important;
    color: #000000 !important;
  }

  body::before {
    display: none !important;
  }

  .course-tex-body,
  .course-tex-body p,
  .course-tex-body li,
  .course-tex-body .tex-section,
  .course-tex-body .tex-subsection,
  .course-tex-body .tex-subsubsection,
  .course-tex-body mjx-container {
    color: #000000 !important;
  }

  .course-tex-body {
    font-size: 11pt;
  }

  .tex-callout,
  .tex-table-wrap,
  .tex-doc-header,
  figure,
  .tex-caption {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .tex-section {
    break-after: avoid;
    page-break-after: avoid;
  }

  @page {
    margin: 1.6cm;
  }
}