:root {
  /* Teinte initiale : bleu coordonné (~242deg) */
  --site-hue: 242;

  /* Contenu principal et fond global */
  --bg-site: hsl(var(--site-hue), 98%, 63%);

  /* Barre latérale / bandeau mobile : teinte coordonnée, plus profonde */
  --bg-menu: hsl(var(--site-hue), 85%, 52%);

  --color-accent: hsl(var(--site-hue), 95%, 15%);
  --border-rule: 1px solid var(--color-accent);
  --sidebar-width: 300px;
  --space-8: 8px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-48: 48px;
}

*, *::before, *::after {
  box-sizing: border-box;
  border-radius: 0 !important;
  box-shadow: none !important;
  animation: none !important;
}

/* Transition fluide des arrière-plans, textes et bordures lors de la rotation de teinte */
html,
body,
.mobile-header,
.sidebar,
.main-content,
.site-title,
.nav-link,
.content-container a,
.menu-toggle-btn,
span.wtit,
span.mat {
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

html, body {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

html {
  background-color: var(--bg-site);
}

body {
  margin: 0;
  padding: 0;
  font-size: 18px;
  font-family: 'Helvetica Neue', Arial, Helvetica, Verdana, sans-serif;
  background-color: var(--bg-site);
  color: var(--color-accent);
  line-height: 1.35;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.nav-toggle-input {
  display: none;
}

.mobile-header {
  display: none;
}

.layout-container {
  display: flex;
  flex-direction: row;
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}

.sidebar {
  width: var(--sidebar-width);
  flex: 0 0 var(--sidebar-width);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: var(--border-rule);
  padding: var(--space-24) var(--space-16);
  display: flex;
  flex-direction: column;
  background-color: var(--bg-menu);
  box-sizing: border-box;
}

.sidebar-identity {
  margin-bottom: var(--space-24);
  padding-bottom: var(--space-16);
  border-bottom: var(--border-rule);
}

.site-title {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 4px 8px;
  font-size: 20px;
  font-weight: bold;
  color: var(--color-accent);
  background-color: transparent;
  text-decoration: none;
  line-height: 1.25;
}

.site-title:hover,
.site-title:focus-visible {
  background-color: var(--color-accent);
  color: var(--bg-site);
  text-decoration: none;
}

.main-content {
  flex: 1 1 0;
  min-width: 0;
  max-width: 100%;
  background-color: var(--bg-site);
  padding: var(--space-32) var(--space-48);
  box-sizing: border-box;
  overflow-y: visible;
}

.content-container {
  width: 100%;
  max-width: 100%;
  min-width: 0;
}

/* Navigation principale */
.site-nav {
  display: block;
  width: 100%;
}

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

.nav-item,
.nav-subitem {
  margin-bottom: 2px;
}

.nav-item:last-child,
.nav-subitem:last-child {
  margin-bottom: 0;
}

.nav-sublist {
  margin-top: 2px;
  margin-left: var(--space-8);
  padding-left: var(--space-8);
  border-left: var(--border-rule);
}

.nav-link {
  display: block;
  width: 100%;
  box-sizing: border-box;
  white-space: normal;
  overflow-wrap: break-word;
  word-break: normal;
  line-height: 1.25;
  padding: 4px 8px;
  font-size: 15px;
  font-weight: bold;
  color: var(--color-accent);
  background-color: transparent;
  text-decoration: none;
  border: none;
  outline: none;
  cursor: pointer;
}

.nav-link:hover,
.nav-link:focus-visible {
  background-color: var(--color-accent);
  color: var(--bg-site);
  text-decoration: none;
}

.nav-link.active,
.nav-link[aria-current="page"] {
  background-color: var(--color-accent);
  color: var(--bg-site);
  text-decoration: none;
}

.nav-sublink {
  font-size: 14px;
}

/* ==========================================================================
   ZONE D'ACCUEIL ET HIÉRARCHIE DU TEXTE PRINCIPAL (Règle 5)
   ========================================================================== */
.welcome-header-block {
  border-bottom: var(--border-rule);
  padding-bottom: var(--space-24);
  margin-bottom: var(--space-32);
  max-width: 760px;
}

.welcome-header-block h1 {
  font-size: 26px;
  font-weight: bold;
  line-height: 1.2;
  color: var(--color-accent);
  margin: 0 0 var(--space-16) 0;
  letter-spacing: -0.01em;
}

.welcome-header-block h2 {
  font-size: 19px;
  font-weight: bold;
  line-height: 1.25;
  color: var(--color-accent);
  margin: 0 0 var(--space-16) 0;
}

.welcome-header-block p {
  font-size: 17px;
  line-height: 1.35;
  color: var(--color-accent);
  margin: 0 0 var(--space-8) 0;
}

/* Liste technique de métadonnées et liens transversaux */
.meta-links-wrapper {
  margin-top: var(--space-16);
}

.meta-links-list {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.meta-links-list .meta-link-item {
  margin: 0;
  padding: 0;
}

.meta-links-list .meta-link-item a {
  display: inline-block;
  padding: 4px 12px;
  font-size: 15px;
  font-weight: bold;
  line-height: 1.25;
  color: var(--color-accent);
  background-color: transparent;
  border: var(--border-rule);
  text-decoration: none;
  box-sizing: border-box;
}

.meta-links-list .meta-link-item a:hover,
.meta-links-list .meta-link-item a:focus-visible {
  background-color: var(--color-accent);
  color: var(--bg-site);
  text-decoration: none;
}

/* Typographie générale de la zone de contenu */
.main-content h1,
.content-container h1 {
  font-size: 26px;
  font-weight: bold;
  line-height: 1.2;
  color: var(--color-accent);
  margin-top: 0;
  margin-bottom: var(--space-16);
}

.main-content h2,
.content-container h2 {
  font-size: 19px;
  font-weight: bold;
  line-height: 1.25;
  color: var(--color-accent);
  margin-top: 0;
  margin-bottom: var(--space-16);
}

.main-content h3,
.main-content h4,
.main-content h5,
.main-content h6,
.content-container h3,
.content-container h4,
.content-container h5,
.content-container h6 {
  font-size: 16px;
  font-weight: bold;
  line-height: 1.25;
  color: var(--color-accent);
  margin-top: 0;
  margin-bottom: var(--space-16);
}

.main-content p,
.content-container p {
  font-size: 17px;
  line-height: 1.35;
  color: var(--color-accent);
  margin-top: 0;
  margin-bottom: var(--space-16);
}

.main-content a,
.content-container a {
  color: var(--color-accent);
  text-decoration: underline;
}

.main-content a:hover,
.main-content a:focus-visible,
.content-container a:hover,
.content-container a:focus-visible {
  background-color: var(--color-accent);
  color: var(--bg-site);
  text-decoration: none;
}

/* Liens isolés dans un paragraphe sans JS (fallback) */
.main-content p > a:only-child,
.content-container p > a:only-child {
  display: inline-block;
  padding: 4px 12px;
  font-size: 15px;
  font-weight: bold;
  line-height: 1.25;
  color: var(--color-accent);
  background-color: transparent;
  border: var(--border-rule);
  text-decoration: none;
}

.main-content p > a:only-child:hover,
.main-content p > a:only-child:focus-visible,
.content-container p > a:only-child:hover,
.content-container p > a:only-child:focus-visible {
  background-color: var(--color-accent);
  color: var(--bg-site);
  text-decoration: none;
}

.main-content a img,
.content-container a img {
  border: none;
}

.main-content blockquote,
.content-container blockquote {
  padding-left: var(--space-16);
  margin: 0 0 var(--space-16) 0;
  border-left: var(--border-rule);
}

.main-content small,
.content-container small {
  font-size: 11px;
}

.main-content code,
.content-container code {
  font-family: monospace;
  font-size: 15px;
}

/* Balises spécifiques des oeuvres (wtit / mat) */
span.mat {
  font-variant: small-caps;
  color: var(--color-accent);
  font-size: 16px;
  display: inline-block;
  margin-bottom: var(--space-8);
}

span.wtit {
  font-weight: bold;
  font-size: 24px;
  background-color: var(--color-accent);
  color: var(--bg-site);
  padding: 4px 8px;
  line-height: 1.25;
  display: inline-block;
  margin-bottom: var(--space-8);
}

/* Paragraphes contenant des images */
.main-content p:has(> img),
.content-container p:has(> img) {
  margin-top: var(--space-16);
  margin-bottom: var(--space-24);
  overflow: visible;
}

/* Images dans la zone principale (Règle 6) */
.main-content img,
.content-container img {
  max-width: 100%;
  height: auto;
  display: block;
  margin-bottom: var(--space-16);
}

/* ==========================================================================
   LAYOUT MOBILE (Règle 4)
   ========================================================================== */
@media (max-width: 768px) {
  .layout-container {
    display: block;
    width: 100%;
    max-width: 100%;
    min-height: auto;
    overflow-x: hidden;
  }

  .mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 var(--space-16);
    background-color: var(--bg-menu);
    border-bottom: var(--border-rule);
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .mobile-site-title {
    display: block;
    padding: 4px 8px;
    font-size: 18px;
    font-weight: bold;
    color: var(--color-accent);
    background-color: transparent;
    text-decoration: none;
    line-height: 1.25;
    flex-shrink: 0;
  }

  .mobile-site-title:hover,
  .mobile-site-title:focus-visible {
    background-color: var(--color-accent);
    color: var(--bg-site);
    text-decoration: none;
  }

  .menu-toggle-btn {
    display: inline-block;
    padding: 4px 8px;
    font-size: 14px;
    font-weight: bold;
    font-family: inherit;
    color: var(--color-accent);
    background-color: transparent;
    border: var(--border-rule);
    cursor: pointer;
    user-select: none;
    line-height: 1.25;
    flex-shrink: 0;
  }

  .menu-toggle-btn:hover,
  .menu-toggle-btn:focus-visible {
    background-color: var(--color-accent);
    color: var(--bg-site);
  }

  .menu-toggle-btn .label-opened {
    display: none;
  }

  .menu-toggle-btn .label-closed {
    display: inline;
  }

  .sidebar {
    display: none;
    width: 100%;
    flex: none;
    position: static;
    height: auto;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    border-right: none;
    border-bottom: var(--border-rule);
    padding: var(--space-16);
    background-color: var(--bg-menu);
  }

  .sidebar-identity {
    display: none;
  }

  .nav-toggle-input:checked ~ .mobile-header .menu-toggle-btn {
    background-color: var(--color-accent);
    color: var(--bg-site);
  }

  .nav-toggle-input:checked ~ .mobile-header .menu-toggle-btn .label-closed {
    display: none;
  }

  .nav-toggle-input:checked ~ .mobile-header .menu-toggle-btn .label-opened {
    display: inline;
  }

  .nav-toggle-input:checked ~ .layout-container .sidebar {
    display: block;
  }

  .main-content {
    padding: var(--space-16);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
  }

  .welcome-header-block h1 {
    font-size: 22px;
    word-break: break-word;
  }

  .main-content img,
  .content-container img {
    max-width: 100%;
    height: auto;
  }

  span.wtit {
    margin-left: 0;
  }
}