.site-header {
  position: sticky; top: 0; z-index: 1000;
  height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(17, 20, 16, .72);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease;
}
.site-header.is-scrolled {
  background: rgba(17, 20, 16, .94);
  border-bottom-color: var(--color-border);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 2px; font-size: 1.25rem; }
.brand img { width: 34px; height: 34px; }
.brand__name { color: var(--color-text); }

// --- Nav desktop + méga-menu ---
.nav { display: none; }
@media (min-width: 1024px) {
  .nav { display: flex; align-items: center; gap: 4px; }
  .nav__item { position: relative; }
  .nav__link {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 16px; border-radius: 10px; font-weight: 600; font-size: .95rem;
    color: var(--color-text); transition: background .15s ease, color .15s ease;
  }
  .nav__item:hover .nav__link { background: var(--color-relief); }
  .megamenu {
    position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%) translateY(8px);
    min-width: 520px; padding: 20px; border-radius: var(--radius);
    background: var(--color-card); border: 1px solid var(--color-border);
    box-shadow: 0 24px 60px rgba(0, 0, 0, .45);
    opacity: 0; visibility: hidden; transition: opacity .2s ease, transform .2s ease;
    display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
  }
  .nav__item:hover .megamenu,
  .nav__item:focus-within .megamenu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
  .megamenu__link {
    display: flex; flex-direction: column; gap: 2px; padding: 12px 14px; border-radius: 10px;
    transition: background .15s ease;
  }
  .megamenu__link:hover { background: var(--color-relief); }
  .megamenu__title { font-weight: 600; display: flex; align-items: center; gap: 8px; }
  .megamenu__desc { font-size: .82rem; color: var(--color-muted); }
}
.header__actions { display: flex; align-items: center; gap: 12px; }

// --- Burger + menu mobile ---
.burger {
  display: inline-flex; flex-direction: column; gap: 5px; padding: 10px; background: transparent; border: 0;
}
.burger span { width: 24px; height: 2px; background: var(--color-text); transition: transform .25s ease, opacity .2s ease; }
@media (min-width: 1024px) { .burger { display: none; } }

.mobile-menu {
  position: fixed; inset: 0; z-index: 1100;
  background: var(--color-bg);
  transform: translateX(100%); transition: transform .3s ease;
  display: flex; flex-direction: column; padding: 24px; overflow-y: auto;
}
.mobile-menu.is-open { transform: translateX(0); }
.mobile-menu__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.mobile-menu__close { background: transparent; border: 0; color: var(--color-text); font-size: 1.8rem; line-height: 1; }
.m-acc { border-bottom: 1px solid var(--color-border); }
.m-acc__btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 16px 4px; background: transparent; border: 0; color: var(--color-text);
  font-size: 1.15rem; font-family: var(--font-title);
}
.m-acc__panel { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.m-acc.is-open .m-acc__panel { max-height: 600px; }
.m-acc__panel a { display: block; padding: 10px 4px 10px 16px; color: var(--color-muted); }
body.no-scroll { overflow: hidden; }