/* HELIUM Technologies – feuille de style du site statique.
   Mobile d'abord ; contrastes conformes WCAG 2.2 AA ; aucune ressource externe. */

:root {
  --c-primary: #244c9b;        /* 8,1:1 sur blanc */
  --c-primary-dark: #172f63;
  --c-accent: #eb6524;         /* décoratif uniquement (bordures, focus) */
  --c-accent-text: #b8470f;    /* 5,3:1 sur blanc, pour le texte */
  --c-text: #1f2430;
  --c-muted: #4a5163;          /* 7,9:1 sur blanc */
  --c-bg: #ffffff;
  --c-bg-alt: #f2f5fa;
  --c-border: #d5dbe6;
  --c-footer: #14254a;
  --radius: .5rem;
  --shadow: 0 1px 3px rgb(20 37 74 / .12), 0 4px 12px rgb(20 37 74 / .08);
  --container: 72rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
}

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

a { color: var(--c-primary); text-underline-offset: .15em; }
a:hover { color: var(--c-primary-dark); text-decoration-thickness: .125em; }

:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
}

h1, h2, h3, h4 { line-height: 1.25; color: var(--c-primary-dark); margin: 1.6em 0 .6em; }
h1 { font-size: clamp(1.75rem, 1.3rem + 2vw, 2.5rem); margin-top: .4em; }
h2 { font-size: clamp(1.35rem, 1.15rem + 1vw, 1.75rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

.container { width: min(100% - 2rem, var(--container)); margin-inline: auto; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 1rem; top: -10rem; z-index: 100;
  padding: .75rem 1rem;
  background: var(--c-primary-dark); color: #fff;
  border-radius: 0 0 var(--radius) var(--radius);
}
.skip-link:focus { top: 0; color: #fff; }

/* ---------- En-tête et navigation ---------- */
.site-header {
  background: var(--c-bg);
  border-bottom: 4px solid var(--c-accent);
  position: relative;
  z-index: 10;
}
.header-inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: .5rem 1rem; padding-block: .5rem;
}
.brand { display: inline-flex; padding: .25rem 0; }
.brand-logo { width: 7.5rem; height: auto; }

.site-nav { flex: 1 1 100%; }
.menu, .sub-menu, .menu-group-list { list-style: none; margin: 0; padding: 0; }

.menu a, .sub-toggle, .menu-label {
  display: flex; align-items: center; min-height: 2.75rem;
  padding: .5rem .75rem;
  color: var(--c-primary-dark); font-weight: 600; text-decoration: none;
  border-radius: var(--radius);
}
.menu a:hover, .sub-toggle:hover { background: var(--c-bg-alt); text-decoration: underline; }
.menu a[aria-current="page"] { color: var(--c-accent-text); text-decoration: underline; text-decoration-thickness: 2px; }
.has-sub.is-active > a, .has-sub.is-active > .sub-toggle:not(.sub-toggle-icon) { color: var(--c-accent-text); }

.sub-toggle {
  font: inherit; font-weight: 600; background: none; border: 0; cursor: pointer; gap: .4rem;
}
.sub-toggle::after {
  content: ""; width: .5rem; height: .5rem;
  border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform .15s ease;
}
.sub-toggle[aria-expanded="true"]::after { transform: rotate(-135deg) translateY(-2px); }
.sub-toggle-icon { min-width: 2.75rem; justify-content: center; }

.has-sub { display: flex; flex-wrap: wrap; align-items: center; }
.has-sub > a { flex: 1 1 auto; }
.sub-menu { flex: 1 1 100%; padding-left: 1rem; }
.sub-menu a { font-weight: 500; }
.menu-group {
  display: block; padding: .75rem .75rem .25rem;
  font-size: .875rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--c-muted);
}
.menu-group-list { padding-left: .75rem; }
.has-sub > .menu-group, .has-sub > .menu-group-list { flex: 1 1 100%; }
.has-sub > .sub-toggle:not(.sub-toggle-icon) { flex: 1 1 auto; justify-content: space-between; }
.menu-group-list a { font-weight: 500; }

.nav-toggle {
  display: inline-flex; align-items: center; gap: .5rem;
  min-height: 2.75rem; padding: .5rem .9rem;
  font: inherit; font-weight: 700; color: #fff; background: var(--c-primary);
  border: 0; border-radius: var(--radius); cursor: pointer;
}
.nav-toggle-icon, .nav-toggle-icon::before, .nav-toggle-icon::after {
  display: block; width: 1.25rem; height: 2px; background: currentColor; position: relative;
}
.nav-toggle-icon::before, .nav-toggle-icon::after { content: ""; position: absolute; left: 0; }
.nav-toggle-icon::before { top: -6px; }
.nav-toggle-icon::after { top: 6px; }

/* Avec JavaScript : menus repliables (sans JS, tout reste visible). */
.js .sub-menu { display: none; }
.js .sub-toggle[aria-expanded="true"] + .sub-menu { display: block; }

@media (max-width: 74.99em) {
  .js .site-nav { flex: 0 0 auto; }
  .js .nav-toggle[aria-expanded="false"] + .menu { display: none; }
  .js .nav-toggle[aria-expanded="true"] + .menu {
    position: absolute; left: 0; right: 0; top: 100%;
    max-height: calc(100vh - 6rem); overflow-y: auto;
    padding: .5rem 1rem 1rem; background: var(--c-bg);
    border-bottom: 4px solid var(--c-accent); box-shadow: var(--shadow);
  }
}

@media (min-width: 75em) {
  .brand-logo { width: 9rem; }
  .site-nav, .js .site-nav { flex: 1 1 auto; }
  .nav-toggle { display: none !important; }
  .menu { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .125rem; }
  .menu > li { position: relative; }
  .has-sub { flex-wrap: nowrap; }
  .menu > li > a, .menu > li > .sub-toggle, .menu > li > .menu-label { padding-inline: .6rem; font-size: .975rem; }
  .menu > li > .sub-toggle-icon { min-width: 2rem; padding-inline: .25rem; }
  .sub-menu {
    position: absolute; top: 100%; left: 0; min-width: 17rem; max-width: 22rem;
    padding: .5rem; background: var(--c-bg);
    border-top: 3px solid var(--c-accent); border-radius: 0 0 var(--radius) var(--radius);
    box-shadow: var(--shadow);
  }
  .menu > li:last-child .sub-menu, .menu > li:nth-last-child(2) .sub-menu { left: auto; right: 0; }
  /* Sans JS sur grand écran : sous-menus au survol ou au focus */
  html:not(.js) .sub-menu { display: none; }
  html:not(.js) .has-sub:hover > .sub-menu, html:not(.js) .has-sub:focus-within > .sub-menu { display: block; }
}

/* ---------- Fil d'Ariane ---------- */
.breadcrumb ol {
  display: flex; flex-wrap: wrap; gap: .25rem; list-style: none;
  margin: 1rem auto 0; padding: 0; font-size: .9rem; color: var(--c-muted);
}
.breadcrumb li + li::before { content: "›"; margin-right: .35rem; color: var(--c-muted); }
.breadcrumb [aria-current="page"] { font-weight: 600; color: var(--c-text); }

/* ---------- Contenu ---------- */
.site-main { display: block; padding-bottom: 3rem; }
.site-main:focus { outline: none; }
.content { padding-top: .5rem; }
.page-header { border-bottom: 1px solid var(--c-border); margin-bottom: 1.5rem; }
.page-header h1 { margin-bottom: .5rem; }
.meta { color: var(--c-muted); font-size: .95rem; margin-top: 0; }

.prose { max-width: 48rem; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li { margin-block: .3rem; }
.prose h2 { color: var(--c-accent-text); }
.prose blockquote {
  margin: 1.5rem 0; padding: .75rem 1.25rem;
  border-left: 4px solid var(--c-accent); background: var(--c-bg-alt); border-radius: 0 var(--radius) var(--radius) 0;
}
.prose img { display: block; margin-block: 1rem; border-radius: var(--radius); }
.prose table { border-collapse: collapse; width: 100%; margin-block: 1rem; }
.prose th, .prose td { border: 1px solid var(--c-border); padding: .5rem .75rem; text-align: left; vertical-align: top; }
.prose th { background: var(--c-bg-alt); }

.testimonial { margin: 1.5rem 0; }
.testimonial blockquote { margin: 0; font-style: italic; }
.testimonial figcaption { margin-top: .5rem; font-weight: 600; color: var(--c-muted); }
.testimonial figcaption::before { content: "— "; }

.layout-grid {
  display: grid; gap: 1rem; margin-block: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
}
.layout-cell { padding: 1rem; background: var(--c-bg-alt); border-radius: var(--radius); }
.layout-cell > :first-child { margin-top: 0; }
.layout-cell > :last-child { margin-bottom: 0; }

.article-figure { margin: 0 0 1.5rem; max-width: 48rem; }
.article-figure img { width: 100%; max-height: 26rem; object-fit: cover; border-radius: var(--radius); }
.article-figure figcaption { font-size: .9rem; color: var(--c-muted); margin-top: .4rem; }

.subpages { margin-top: 2.5rem; max-width: 48rem; }
.card-links { list-style: none; padding: 0; display: grid; gap: .75rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr)); }
.card-links a {
  display: block; height: 100%; padding: 1rem 1.1rem;
  border: 1px solid var(--c-border); border-left: 4px solid var(--c-accent); border-radius: var(--radius);
  font-weight: 600; text-decoration: none; background: var(--c-bg);
}
.card-links a:hover { background: var(--c-bg-alt); text-decoration: underline; }

/* Listes d'articles */
.teaser-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.25rem; }
.teaser {
  display: grid; gap: 1rem; padding: 1rem;
  border: 1px solid var(--c-border); border-radius: var(--radius); background: var(--c-bg);
}
.teaser-img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: calc(var(--radius) / 2); }
.teaser-title { margin: 0 0 .25rem; font-size: 1.15rem; }
.teaser-title a { text-decoration: none; }
.teaser-title a:hover { text-decoration: underline; }
.teaser p { margin: .25rem 0 0; }
.teaser .meta { margin: 0; }
@media (min-width: 40em) {
  .teaser:has(.teaser-img) { grid-template-columns: 12rem 1fr; }
  .teaser-img { aspect-ratio: 4 / 3; }
}
.empty { color: var(--c-muted); }

/* ---------- Accueil ---------- */
.hero { position: relative; isolation: isolate; color: #fff; background: var(--c-primary-dark); }
.hero-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -2; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(90deg, rgb(13 25 52 / .92) 0%, rgb(13 25 52 / .78) 55%, rgb(13 25 52 / .55) 100%);
}
.hero-content { padding-block: clamp(3rem, 8vw, 6rem); }
.hero h1 { color: #fff; margin: 0 0 .75rem; font-size: clamp(2rem, 1.4rem + 3vw, 3.25rem); }
.hero-lead { font-size: clamp(1.1rem, 1rem + .5vw, 1.35rem); max-width: 40rem; margin: 0 0 1.5rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 2.75rem;
  padding: .6rem 1.25rem; border-radius: var(--radius); font-weight: 700; text-decoration: none;
  border: 2px solid transparent;
}
.btn-primary { background: var(--c-accent-text); color: #fff; }
.btn-primary:hover { background: #8f370b; color: #fff; text-decoration: underline; }
.btn-secondary { background: #fff; color: var(--c-primary-dark); border-color: var(--c-primary); }
.btn-secondary:hover { background: var(--c-bg-alt); color: var(--c-primary-dark); text-decoration: underline; }

.section { padding-block: 2.5rem; }
.section > h2:first-child, .section .container > h2:first-child { margin-top: 0; }
.section-alt { background: var(--c-bg-alt); }

.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr)); }
.cards-4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); }
.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
}
.card-img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.card-body { padding: 1rem 1.1rem 1.25rem; }
.card-title { margin: 0 0 .4rem; font-size: 1.15rem; }
.card-title a { text-decoration: none; }
.card-title a::after { content: ""; position: absolute; inset: 0; } /* carte entièrement cliquable */
.card:hover .card-title a { text-decoration: underline; }
.card:focus-within { outline: 3px solid var(--c-accent); outline-offset: 2px; }
.card-title a:focus-visible { outline: none; }
.card p { margin: 0; color: var(--c-muted); }

.values { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); }
.values li { padding: 1.25rem; background: var(--c-bg); border-top: 4px solid var(--c-accent); border-radius: var(--radius); }
.values h3 { margin-top: 0; color: var(--c-primary); }
.values p { margin-bottom: 0; }

/* ---------- Contact, plan du site ---------- */
.contact-grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); }
.contact-card { padding: 1.25rem 1.5rem; border: 1px solid var(--c-border); border-radius: var(--radius); }
.contact-card h2 { margin-top: .25rem; }
.contact-card address { font-style: normal; margin-bottom: 1rem; }
.contact-list dt { font-weight: 700; margin-top: .5rem; }
.contact-list dd { margin: 0; }

.sitemap-cols { display: grid; gap: 1rem 3rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); }
.sitemap, .sitemap ul { padding-left: 1.2rem; }
.sitemap li { margin-block: .3rem; }

/* ---------- Pied de page ---------- */
.site-footer { background: var(--c-footer); color: #e8edf7; margin-top: 2rem; font-size: .95rem; }
.site-footer a { color: #fff; }
.site-footer a:hover { color: #fff; text-decoration-thickness: 2px; }
.site-footer a[aria-current="page"] { font-weight: 700; }
.footer-grid {
  display: grid; gap: 1.5rem 2rem; padding-block: 2.5rem 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
}
.footer-nav h2 { color: #fff; font-size: 1.05rem; margin: 0 0 .75rem; padding-bottom: .4rem; border-bottom: 2px solid var(--c-accent); }
.footer-nav ul { list-style: none; margin: 0; padding: 0; }
.footer-nav li { margin-block: .1rem; }
.footer-nav a { display: inline-block; padding-block: .3rem; }
.footer-support { padding-block: 1.25rem; border-top: 1px solid rgb(255 255 255 / .2); }
.support-logos {
  list-style: none; margin: 0; padding: 1rem; display: flex; flex-wrap: wrap; gap: 1rem 2rem;
  justify-content: center; align-items: center; background: #fff; border-radius: var(--radius);
}
.support-logos img { height: 3.125rem; width: auto; }
.support-text { text-align: center; font-style: italic; margin: .75rem 0 0; }
.footer-bottom {
  display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; padding-block: 1.25rem 2rem;
  border-top: 1px solid rgb(255 255 255 / .2);
}
.footer-logo { width: 6rem; height: auto; }
.footer-bottom p { margin: 0; }

/* ---------- Préférences utilisateur ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

@media (forced-colors: active) {
  .card:focus-within, :focus-visible { outline: 3px solid CanvasText; }
  .sub-toggle::after { border-color: CanvasText; }
}

@media print {
  .site-header, .breadcrumb, .site-footer, .skip-link, .subpages, .hero-img { display: none !important; }
  .hero { color: #000; background: none; }
  .hero h1 { color: #000; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: .85em; }
}