:root {
    --couleur-a: #7dadad;
    --couleur-b: #428989;
    --couleur-c: #1a5f7a;
    --couleur-d: #083344;

    --noir: #111111;
    --blanc: #ffffff;
    --fond-clair: #f4f8f8;
    --bordure: #d7e3e3;

    --largeur-conteneur: 1180px;
    --rayon: 0.5rem;

    --police-principale: "Montserrat", "Segoe UI", Roboto, Arial, sans-serif;
}

/*
  Si les fichiers de police sont disponibles,
  les placer dans static/fonts/Montserrat/.
*/

@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 400;
  src: url('../fonts/Montserrat/montserrat-v31-latin-regular.woff2') format('woff2'), /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
       url('../fonts/Montserrat/montserrat-v31-latin-regular.ttf') format('truetype'); /* Chrome 4+, Firefox 3.5+, IE 9+, Safari 3.1+, iOS 4.2+, Android Browser 2.2+ */
}

@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 600;
  src: url('../fonts/Montserrat/montserrat-v31-latin-600.woff2') format('woff2'), /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
       url('../fonts/Montserrat/montserrat-v31-latin-600.ttf') format('truetype'); /* Chrome 4+, Firefox 3.5+, IE 9+, Safari 3.1+, iOS 4.2+, Android Browser 2.2+ */
}

@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 700;
  src: url('../fonts/Montserrat/montserrat-v31-latin-700.woff2') format('woff2'), /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
       url('../fonts/Montserrat/montserrat-v31-latin-700.ttf') format('truetype'); /* Chrome 4+, Firefox 3.5+, IE 9+, Safari 3.1+, iOS 4.2+, Android Browser 2.2+ */
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--noir);
    background: var(--blanc);
    font-family: var(--police-principale);
    font-size: 1rem;
    line-height: 1.6;
}

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

.iframe-sans-cadre {
    border: 0;
}

a {
    color: var(--couleur-d);
    text-decoration: underline;
    text-underline-offset: 0.15em;
}

a:hover {
    color: var(--couleur-c);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    /* --couleur-a seule (2.48:1) n'atteint pas les 3:1 requis pour un
       indicateur de focus (WCAG 1.4.11) sur fond clair. On garde la teinte
       de la charte pour l'anneau visible, et on ajoute un liseré sombre
       (--couleur-d, ~13:1) au contact direct de l'élément pour que la
       limite visuelle reste perceptible quel que soit le fond. */
    outline: 3px solid var(--couleur-a);
    outline-offset: 3px;
    box-shadow: 0 0 0 1px var(--couleur-d);
}

button {
    font: inherit;
}

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

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

.lien-evitement {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1000;
    padding: 0.75rem 1rem;
    color: var(--blanc);
    background: var(--couleur-d);
    transform: translateY(-120%);
}

.lien-evitement:focus {
    transform: translateY(0);
}

/* En-tête */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--blanc);
    border-bottom: 1px solid var(--bordure);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 5rem;
}

.logo {
    display: block;
    max-width: 15rem;
    line-height: 0;
}

.logo img {
    display: block;
    min-width: 130px;
}

.menu-toggle {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--blanc);
    background: var(--couleur-d);
    border: 0;
    border-radius: var(--rayon);
    cursor: pointer;
    font-size: 1.4rem;
}

.navigation {
    display: none;
    width: 100%;
}

.navigation.is-open {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    padding: 1rem;
    background: var(--blanc);
    border-bottom: 1px solid var(--bordure);
}

.navigation-list,
.submenu {
    padding: 0;
    margin: 0;
    list-style: none;
}

.navigation-list a,
.navigation-parent {
    display: block;
    width: 100%;
    padding: 0.75rem 0;
    color: var(--noir);
    background: transparent;
    border: 0;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
}

.navigation-list a[aria-current="page"] {
    color: var(--couleur-c);
    font-weight: 700;
}

.navigation-parent {
    font-weight: 600;
}

.submenu {
    display: none;
    padding-left: 1rem;
}

.submenu.is-open {
    display: block;
}

/* Contenu */

.contenu-page {
    min-height: 60vh;
    padding-block: 3rem;
}

.contenu-page h1,
.contenu-page h2,
.contenu-page h3 {
    line-height: 1.25;
}

.contenu-page h1 {
    color: var(--couleur-d);
    margin-top: 0;
    font-size: clamp(2rem, 5vw, 3.2rem);
}

.contenu-page h2 {
    color: var(--couleur-c);
    margin-top: 2.5rem;
    font-size: clamp(1.5rem, 3vw, 2.2rem);
}

.contenu-page h3 {
    color: var(--couleur-b);
    font-size: 1.25rem;
}

.contenu-page p,
.contenu-page ul,
.contenu-page ol {
    max-width: 75ch;
}

.contenu-page li {
    margin-bottom: 0.4rem;
}

/* Pied de page */

.site-footer {
    padding-block: 3rem 1rem;
    color: var(--blanc);
    background: var(--couleur-c);
}

.site-footer h2 {
    color: var(--blanc);
    font-size: 1.1rem;
}

.site-footer a {
    color: var(--blanc);
}

.footer-photo-cadre {
    width: 192px;
}

.footer-photo-cadre img {
    display: block;
    width: 100%;
    height: auto;
    -webkit-mask-image: linear-gradient(to bottom, black 72%, transparent 96%);
    mask-image: linear-gradient(to bottom, black 72%, transparent 96%);
}

.footer-grid {
    display: grid;
    gap: 2rem;
}

.site-footer ul {
    padding-left: 1.2rem;
}

.site-footer .reseaux-liste {
    display: flex;
    gap: 0.6rem;
    padding-left: 0;
    margin: 0;
    list-style: none;
}

.site-footer .reseau-bulle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: #eef5f5;
    color: var(--couleur-c);
    font-size: 0.95rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 50%;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.reseau-bulle:hover,
.reseau-bulle:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.25);
}

.copyright {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    font-size: 0.875rem;
}

.copyright p {
    margin: 0;
}

/* Tablette et ordinateur */

@media (min-width: 768px) {
    .header-inner {
        min-height: 7rem;
    }

    .logo {
        max-width: 18rem;
    }

    .menu-toggle {
        display: none;
    }

    .navigation {
        display: block;
        width: auto;
    }

    .navigation-list {
        display: flex;
        align-items: center;
        gap: 1.25rem;
    }

    .navigation-list a,
    .navigation-parent {
        width: auto;
        padding: 0.5rem;
        white-space: nowrap;
    }

    .navigation-item {
        position: relative;
    }

    .submenu {
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 14rem;
        padding: 0.75rem;
        background: var(--blanc);
        border: 1px solid var(--bordure);
        box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.12);
    }

    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition: none !important;
        animation: none !important;
    }
}