/*
 * Structure : en-tête, navigation, sections, pied de page.
 */

/* ---- En-tête ---- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 60;
    background: color-mix(in srgb, var(--paper) 92%, transparent);
    border-bottom: 1px solid transparent;
    transition: background 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

@supports (backdrop-filter: blur(1px)) {
    .site-header {
        backdrop-filter: blur(14px) saturate(120%);
    }
}

.site-header.is-scrolled {
    border-bottom-color: var(--line);
    box-shadow: 0 10px 30px -28px rgba(18, 18, 15, 0.6);
}

.site-header__inner {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: clamp(0.75rem, 2vw, 2rem);
    min-height: var(--header-h);
    padding-block: 0.6rem;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--ink);
    text-decoration: none;
    line-height: 1.1;
}

.site-brand__mark {
    width: 40px;
    height: 40px;
    flex: none;
    color: var(--forest);
}

.site-brand__text {
    display: grid;
    gap: 0.1rem;
}

.site-brand__name {
    font-family: var(--font-display);
    font-size: 1.32rem;
    letter-spacing: -0.02em;
}

.site-brand__tagline {
    font-size: 0.62rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--muted);
    white-space: nowrap;
}

/* ---- Navigation principale ---- */

.site-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(0.9rem, 2.2vw, 2rem);
}

.site-nav__link {
    position: relative;
    padding-block: 0.45rem;
    color: var(--ink-soft);
    font-size: 0.9rem;
    text-decoration: none;
    white-space: nowrap;
}

.site-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0.1rem;
    height: 1px;
    background: var(--clay);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s var(--ease-out);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link.is-current::after {
    transform: scaleX(1);
}

.site-nav__link.is-current {
    color: var(--forest);
    font-weight: 500;
}

.site-nav__mobile-only {
    display: none;
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    justify-self: end;
}

/* ---- Sélecteur de langue ---- */

.lang-switcher {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: color-mix(in srgb, var(--white) 55%, transparent);
}

.lang-switcher__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    min-height: 30px;
    padding: 0 0.45rem;
    border-radius: var(--radius-pill);
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.lang-switcher__link:hover {
    color: var(--forest);
}

.lang-switcher__link[aria-current="true"] {
    background: var(--forest);
    color: var(--sand);
}

/* ---- Bouton burger ---- */

.nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: transparent;
    color: var(--forest);
}

.nav-toggle__bars {
    position: relative;
    width: 18px;
    height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
    content: "";
    position: absolute;
    left: 0;
    width: 100%;
    height: 1.5px;
    background: currentColor;
    transition: transform 0.3s var(--ease), top 0.3s var(--ease);
}

.nav-toggle__bars::before {
    top: 1px;
}

.nav-toggle__bars::after {
    top: 9px;
}

body.menu-open .nav-toggle__bars::before {
    top: 5px;
    transform: rotate(45deg);
}

body.menu-open .nav-toggle__bars::after {
    top: 5px;
    transform: rotate(-45deg);
}

/* ---- Sections ---- */

.section {
    position: relative;
    padding-block: clamp(3.75rem, 8vw, 7.5rem);
}

.section--tight {
    padding-block: clamp(2.5rem, 5vw, 4.5rem);
}

.section--sand {
    background: var(--sand);
}

.section--dark {
    background: var(--forest);
    color: var(--sand);
}

.section--dark .eyebrow {
    color: var(--sage);
}

.section--dark .lead {
    color: color-mix(in srgb, var(--sand) 82%, transparent);
}

.section--dark a {
    text-decoration-color: var(--sage);
}

.section__head {
    display: grid;
    gap: var(--space-3);
    max-width: 62ch;
    margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.section__head h2 {
    margin-bottom: 0;
}

/* Filigrane de courbes de niveau, purement décoratif. */
.contours {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    opacity: 0.5;
}

.contours svg {
    position: absolute;
    width: 60rem;
    max-width: none;
    color: var(--sage);
}

/* ---- Pied de page ---- */

.site-footer {
    background: var(--forest);
    color: var(--sand);
    padding-block: clamp(3rem, 6vw, 5rem) 1.75rem;
}

.site-footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(2rem, 5vw, 3.5rem);
}

.site-footer__brand {
    margin-bottom: 0.5rem;
    font-family: var(--font-display);
    font-size: 1.65rem;
}

.site-footer h2 {
    margin-bottom: 0.9rem;
    color: var(--sage);
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.site-footer ul {
    display: grid;
    gap: 0.55rem;
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 0.92rem;
}

.site-footer li {
    max-width: none;
}

.site-footer a {
    color: var(--sand);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s var(--ease);
}

.site-footer a:hover {
    border-bottom-color: var(--sage);
}

.site-footer__bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem 1.5rem;
    margin-top: clamp(2.5rem, 5vw, 4rem);
    padding-top: 1.5rem;
    border-top: 1px solid var(--line-dark);
    color: var(--sage);
    font-size: 0.78rem;
}

.site-footer__note {
    margin-top: 1.25rem;
    color: var(--sage);
    font-size: 0.85rem;
    font-style: italic;
}

.site-footer__bottom p {
    max-width: none;
    margin: 0;
}

/* ---- Adaptations ---- */

@media (min-width: 640px) {
    .site-footer__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .site-footer__grid {
        grid-template-columns: 1.4fr 0.8fr 1fr 0.8fr;
    }
}

@media (max-width: 1023px) {
    .site-brand__tagline {
        display: none;
    }

    /* Spécificité renforcée : components.css (chargé après) définit .btn. */
    .site-header__inner .site-header__cta {
        display: none;
    }

    .site-brand__name {
        white-space: nowrap;
    }
}

@media (max-width: 899px) {
    .nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        position: fixed;
        inset: 0;
        z-index: 55;
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: clamp(1rem, 3vh, 1.75rem);
        padding: calc(var(--header-h) + 2rem) var(--gutter) 2rem;
        background: var(--forest);
        visibility: hidden;
        opacity: 0;
        transform: translateY(-2%);
        transition: opacity 0.35s var(--ease), transform 0.45s var(--ease-out), visibility 0s linear 0.45s;
    }

    .site-nav__link {
        color: var(--sand);
        font-family: var(--font-display);
        font-size: clamp(1.7rem, 6vw, 2.4rem);
        letter-spacing: -0.02em;
    }

    .site-nav__link::after {
        display: none;
    }

    .site-nav__link.is-current {
        color: var(--sage);
    }

    .site-nav__mobile-only {
        display: block;
        margin-top: auto;
        padding-top: 1.5rem;
        border-top: 1px solid var(--line-dark);
        color: var(--sage);
        font-size: 0.9rem;
    }

    body.menu-open {
        overflow: hidden;
    }

    body.menu-open .site-nav {
        visibility: visible;
        opacity: 1;
        transform: none;
        transition-delay: 0s;
    }

    body.menu-open .site-header {
        background: transparent;
        border-bottom-color: transparent;
        box-shadow: none;
        backdrop-filter: none;
    }

    body.menu-open .site-brand,
    body.menu-open .nav-toggle {
        color: var(--sand);
    }

    body.menu-open .site-brand__mark {
        color: var(--sage);
    }

    body.menu-open .lang-switcher {
        border-color: var(--line-dark);
        background: transparent;
    }

    body.menu-open .lang-switcher__link {
        color: var(--sand);
    }

    body.menu-open .lang-switcher__link[aria-current="true"] {
        background: var(--sand);
        color: var(--forest);
    }
}

@media (min-width: 900px) {
    .site-nav__mobile-only {
        display: none;
    }
}