/* ============================================================
   Header — pill flottant (migration fidèle) + menu burger mobile
   ============================================================ */

.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 0.75rem 1rem;
    background-color: transparent;
    color: var(--blanc-ivoire);
    transform: translateY(0);
    transition: transform 0.35s ease, background-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
}

.site-header:not(.is-scrolled) .nav-links > li > a,
.site-header:not(.is-scrolled) .site-header__left .logo,
.site-header:not(.is-scrolled) .nav-caret { color: var(--blanc-ivoire); }
.site-header:not(.is-scrolled) .nav-submenu a { color: var(--noir-onyx); }
.site-header:not(.is-scrolled) .logo img { filter: brightness(0) invert(1); }

.site-header.is-scrolled {
    background-color: var(--blanc-ivoire);
    box-shadow: 0 6px 20px rgba(31, 31, 31, 0.08);
    color: var(--noir-onyx);
}
.site-header.is-hidden { transform: translateY(-110%); }

.site-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 80vw;
    margin: 0 auto;
    border-radius: 999px;
}

.site-header__left { display: flex; align-items: center; }
.site-header__right { display: flex; align-items: center; gap: 2rem; }

.site-header .logo img { height: 80px; width: auto; display: block; transition: height 0.3s ease; }

.nav-links { display: flex; align-items: center; list-style: none; gap: 2.25rem; }
.nav-links > li > a { display: inline-flex; align-items: center; gap: 0.35rem; line-height: 1; }
.nav-links a {
    font-family: var(--font-corps);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--noir-onyx);
    position: relative;
    padding: 0.25rem 0;
    transition: color 0.2s ease;
}
.nav-links > li > a::after {
    content: '';
    position: absolute;
    left: 0; bottom: -4px;
    width: 0; height: 2px;
    background-color: var(--orange-sanguine);
    transition: width 0.25s ease;
}
.nav-links > li > a:hover { color: var(--bleu-cobalt); }
.nav-links > li > a:hover::after { width: 100%; }

/* Sous-menus */
.has-submenu, .menu-item-has-children { position: relative; }
.nav-caret { width: 14px; height: 14px; flex-shrink: 0; transition: transform 0.2s ease; }
.has-submenu:hover .nav-caret,
.has-submenu:focus-within .nav-caret,
.menu-item-has-children:hover .nav-caret { transform: rotate(180deg); }

.nav-submenu, .sub-menu {
    position: absolute;
    top: calc(100% + 0.75rem);
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    min-width: 200px;
    list-style: none;
    background-color: var(--blanc-ivoire);
    border-radius: 18px;
    padding: 0.6rem;
    box-shadow: 0 14px 32px rgba(31, 31, 31, 0.14);
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    opacity: 0; visibility: hidden; pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}
.nav-submenu::before, .sub-menu::before {
    content: ''; position: absolute; top: -10px; left: 0; right: 0; height: 12px;
}
.has-submenu:hover .nav-submenu,
.has-submenu:focus-within .nav-submenu,
.menu-item-has-children:hover .sub-menu,
.menu-item-has-children:focus-within .sub-menu {
    opacity: 1; visibility: visible; pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}
.nav-submenu a, .sub-menu a {
    display: block;
    padding: 0.55rem 0.9rem;
    border-radius: 10px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--noir-onyx);
    transition: background-color 0.2s ease, color 0.2s ease;
}
.nav-submenu a::after, .sub-menu a::after { display: none; }
.nav-submenu a:hover, .sub-menu a:hover { background-color: var(--bleu-celeste); color: var(--bleu-cobalt); }

/* CTA contact */
/* Bouton Contact : métriques alignées sur le système .btn (variante orange) */
.nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--btn-gap);
    font-family: var(--font-corps);
    font-weight: var(--btn-font-weight);
    font-size: var(--btn-font-size);
    text-transform: uppercase;
    letter-spacing: var(--btn-letter-spacing);
    line-height: var(--btn-line-height);
    background-color: var(--orange-sanguine);
    color: var(--blanc-ivoire);
    padding: var(--btn-padding-y) var(--btn-padding-x);
    border: 2px solid transparent;
    border-radius: var(--btn-radius);
    transition: var(--btn-transition);
}
.nav-cta:hover { background-color: var(--noir-onyx); border-color: var(--noir-onyx); transform: translateY(-1px); }

/* ===== Burger (caché en desktop) ===== */
.nav-burger {
    display: none;
    position: relative;
    z-index: 120;
    width: 48px; height: 48px;
    border: none; background: transparent;
    cursor: var(--cursor-link);
    align-items: center; justify-content: center;
}
.nav-burger__box { position: relative; width: 26px; height: 16px; }
.nav-burger__line {
    position: absolute; left: 0;
    width: 100%; height: 2px; border-radius: 2px;
    background-color: currentColor;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.2s ease, width 0.35s ease;
}
.nav-burger__line:nth-child(1) { top: 0; }
.nav-burger__line:nth-child(2) { top: 7px; width: 70%; }
.nav-burger__line:nth-child(3) { top: 14px; }

/* ===== Volet mobile — overlay original (diaphragme + slide en escalier) ===== */
.nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 110;
    background-color: var(--bleu-cobalt);
    color: var(--blanc-ivoire);
    clip-path: circle(0% at calc(100% - 44px) 44px);
    transition: clip-path 0.6s cubic-bezier(0.76, 0, 0.24, 1);
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 6rem 2rem 3rem;
    overflow-y: auto;
}
.nav-overlay__monogram {
    position: absolute;
    right: -8%; bottom: -10%;
    width: 60vw; max-width: 520px;
    opacity: 0.08;
    pointer-events: none;
}
.nav-overlay__list { list-style: none; display: flex; flex-direction: column; gap: 0.25rem; }
.nav-overlay__list > li { overflow: hidden; }
.nav-overlay__list > li > a {
    display: inline-block;
    font-family: var(--font-titre);
    text-transform: uppercase;
    font-size: clamp(2rem, 9vw, 3.4rem);
    line-height: 1.15;
    color: var(--blanc-ivoire);
    transform: translateY(110%);
    transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1), color 0.2s ease;
}
.nav-overlay__list > li > a:hover { color: var(--jaune-safran); }
.nav-overlay__sub { list-style: none; margin: 0.35rem 0 0.75rem 0.2rem; display: flex; flex-wrap: wrap; gap: 0.35rem 1.25rem; }
.nav-overlay__sub a {
    font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.5px;
    color: var(--bleu-celeste); opacity: 0; transition: opacity 0.4s ease 0.2s, color 0.2s ease;
}
.nav-overlay__sub a:hover { color: var(--blanc-ivoire); }
.nav-overlay__footer {
    margin-top: 2.5rem; display: flex; flex-wrap: wrap; gap: 1rem 2rem;
    font-size: 0.9rem; opacity: 0; transition: opacity 0.4s ease 0.35s;
}
.nav-overlay__footer a { color: var(--blanc-ivoire); }

body.nav-open { overflow: hidden; }
body.nav-open .nav-overlay { clip-path: circle(150% at calc(100% - 44px) 44px); pointer-events: auto; }
body.nav-open .nav-overlay__list > li > a { transform: translateY(0); }
body.nav-open .nav-overlay__sub a,
body.nav-open .nav-overlay__footer { opacity: 1; }
/* délai en escalier sur les items */
body.nav-open .nav-overlay__list > li:nth-child(1) > a { transition-delay: 0.12s; }
body.nav-open .nav-overlay__list > li:nth-child(2) > a { transition-delay: 0.20s; }
body.nav-open .nav-overlay__list > li:nth-child(3) > a { transition-delay: 0.28s; }
body.nav-open .nav-overlay__list > li:nth-child(4) > a { transition-delay: 0.36s; }
body.nav-open .nav-overlay__list > li:nth-child(5) > a { transition-delay: 0.44s; }

/* burger -> croix */
body.nav-open .nav-burger { color: var(--blanc-ivoire); }
body.nav-open .nav-burger__line:nth-child(1) { top: 7px; transform: rotate(45deg); }
body.nav-open .nav-burger__line:nth-child(2) { opacity: 0; width: 0; }
body.nav-open .nav-burger__line:nth-child(3) { top: 7px; transform: rotate(-45deg); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .site-header nav { max-width: 92vw; }
    .nav-links, .site-header__right > .nav-cta { display: none; }
    .nav-burger { display: inline-flex; }
    .site-header.is-scrolled .nav-burger { color: var(--noir-onyx); }
    .site-header:not(.is-scrolled) .nav-burger { color: var(--blanc-ivoire); }
    .site-header .logo img { height: 56px; }
}
@media (min-width: 1025px) {
    .nav-overlay { display: none; }
}