/* Header & footer (shared) */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(140%) blur(16px);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
  border-bottom: 1px solid var(--line-soft);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: var(--s-6);
}
.site-header.on-dark {
  background: rgba(0,37,34,0.82);
  border-bottom-color: rgba(255,255,255,0.06);
}
.site-header.on-dark .nav-link { color: rgba(255,255,255,0.78); }
.site-header.on-dark .nav-link:hover,
.site-header.on-dark .nav-link.is-active { color: var(--white); }
.site-header.on-dark .brand-mark .word { color: var(--white); }
.site-header.on-dark .lang-toggle { color: rgba(255,255,255,0.6); border-color: rgba(255,255,255,0.14); }

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.brand-mark .signal {
  width: 26px;
  height: 26px;
  color: var(--mint);
}
.brand-mark .word {
  font-family: var(--ff-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 19px;
  color: var(--sapin);
}
.brand-mark .word em {
  font-style: normal;
  color: var(--mint);
}
.brand-mark .brand-logo {
  display: block;
  height: 40px;
  width: 102px;
}
@media (max-width: 520px) {
  .brand-mark .brand-logo { height: 32px; width: 81.6px; }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 36px);
}
.nav-link {
  font-family: var(--ff-display);
  font-weight: 600;
  font-size: 14.5px;
  color: var(--ink);
  position: relative;
  transition: color var(--t-fast);
}
.nav-link:hover, .nav-link.is-active { color: var(--sapin); }
.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  transform: translateX(-50%);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--mint);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: var(--s-4);
}
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--ink-60);
  transition: all var(--t-fast);
  cursor: pointer;
}
.lang-toggle:hover { color: var(--sapin); border-color: var(--sapin); }
.lang-toggle strong { color: var(--sapin); font-weight: 700; }
.lang-toggle .sep { opacity: 0.4; }

.menu-burger { display: none; }

/* Mobile header */
@media (max-width: 880px) {
  .site-header .container { gap: var(--s-3); }
  .site-nav { display: none; }
  .header-tools .btn { display: none; }
  .menu-burger {
    display: inline-flex;
    width: 44px; height: 44px;
    align-items: center; justify-content: center;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--white);
    cursor: pointer;
    z-index: 60;
    position: relative;
    transition: border-color var(--t-fast), background-color var(--t-fast);
  }
  .menu-burger:hover { border-color: var(--sapin); }
  .menu-burger span {
    display: block;
    width: 22px; height: 2px;
    background: var(--sapin);
    border-radius: 1px;
    position: relative;
    transition: background-color var(--t-fast);
  }
  .menu-burger span::before, .menu-burger span::after {
    content: "";
    position: absolute; left: 0;
    width: 22px; height: 2px;
    background: var(--sapin);
    border-radius: 1px;
    transition: transform var(--t-fast), top var(--t-fast);
  }
  .menu-burger span::before { top: -7px; }
  .menu-burger span::after { top: 7px; }

  /* Drawer open state */
  body.menu-open { overflow: hidden; }
  /* Désactive backdrop-filter qui créerait un containing block et casserait le position: fixed des enfants */
  body.menu-open .site-header {
    background: var(--white);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  body.menu-open .site-nav {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0; bottom: 0;
    background: var(--white);
    padding: var(--s-6) var(--gutter) calc(var(--header-h) + var(--s-6));
    gap: 0;
    z-index: 48;
    overflow-y: auto;
  }
  body.menu-open .site-nav .nav-link {
    font-family: var(--ff-display);
    font-weight: 700;
    font-size: 22px;
    color: var(--sapin);
    padding: 18px 0;
    border-bottom: 1px solid var(--line-soft);
  }
  body.menu-open .site-nav .nav-link.is-active { color: var(--mint); }
  body.menu-open .site-nav .nav-link.is-active::after { display: none; }
  body.menu-open .header-tools .btn {
    display: inline-flex;
    position: fixed;
    left: var(--gutter); right: var(--gutter);
    bottom: var(--s-6);
    z-index: 49;
    justify-content: center;
    height: 56px;
    font-size: 16px;
  }

  /* Burger → X */
  body.menu-open .menu-burger span { background-color: transparent; }
  body.menu-open .menu-burger span::before { top: 0; transform: rotate(45deg); }
  body.menu-open .menu-burger span::after  { top: 0; transform: rotate(-45deg); }
}

@media (max-width: 520px) {
  .lang-toggle { display: none; }
}

/* ===== Footer ===== */
.site-footer {
  background: var(--sapin-3);
  color: rgba(255,255,255,0.7);
  padding-block: clamp(64px, 8vw, 96px) 28px;
}
.site-footer .container { display: grid; gap: var(--s-8); }
.site-footer .footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--s-7);
  align-items: start;
}
.site-footer .brand-block { max-width: 28ch; }
.site-footer .brand-mark .brand-logo { height: 60px; width: 153px; }
.site-footer .brand-mark .word { color: var(--white); }
.site-footer h5 {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--mint);
  margin-bottom: 18px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.site-footer a { color: rgba(255,255,255,0.78); font-size: 15px; }
.site-footer a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--s-4);
  font-size: 12px;
  font-family: var(--ff-mono);
  color: rgba(255,255,255,0.45);
}
.footer-bottom a { font-family: var(--ff-mono); font-size: 12px; }

@media (max-width: 880px) {
  .site-footer .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: var(--s-6);
  }
  .site-footer .brand-block { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .site-footer .footer-top { grid-template-columns: 1fr; }
}