.site-header { position: sticky; z-index: 40; top: 0; border-bottom: 1px solid rgba(51, 51, 51, .08); background: rgba(255, 255, 255, .95); backdrop-filter: blur(18px); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; width: min(1320px, calc(100% - 40px)); min-height: 84px; margin: 0 auto; gap: 16px; }
.site-logo { display: inline-flex; align-items: center; flex: 0 0 auto; }
.site-logo img { width: 198px; height: auto; }
.site-navigation { min-width: 0; }
.site-navigation__list { display: flex; align-items: center; justify-content: center; gap: clamp(10px, 1.15vw, 20px); margin: 0; padding: 0; list-style: none; }
.site-navigation a, .nav-products__trigger { color: var(--color-text); font-size: .84rem; font-weight: 750; white-space: nowrap; }
.site-navigation a:hover, .nav-products__trigger:hover { color: var(--color-primary); }
.nav-products { position: relative; }
.nav-products__trigger { display: inline-flex; gap: 6px; align-items: center; padding: 28px 0; border: 0; background: transparent; }
.nav-products__trigger > span { display: none; }
.nav-products__trigger::after { width: 6px; height: 6px; margin-top: -3px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; content: ""; transform: rotate(45deg); transition: transform .22s ease, margin .22s ease; }
.nav-products.is-open .nav-products__trigger::after { margin-top: 3px; transform: rotate(225deg); }
.product-mega-menu { position: absolute; top: calc(100% + 8px); left: 0; display: grid; width: min(420px, calc(100vw - 32px)); max-height: calc(100vh - 96px); padding: 22px; overflow-y: auto; border: 1px solid var(--color-line); border-radius: 18px; visibility: hidden; opacity: 0; background: #fff; box-shadow: var(--shadow); transform: translateY(10px); transition: opacity .22s ease, transform .22s ease, visibility .22s ease; }
.nav-products--diamond .product-mega-menu { width: min(850px, calc(100vw - 32px)); }
.nav-products--wedding .product-mega-menu, .nav-products--lab-grown .product-mega-menu, .nav-products--custom .product-mega-menu { right: 0; left: auto; }
.nav-products.is-open .product-mega-menu { visibility: visible; opacity: 1; transform: translateY(0); }
.product-mega-menu__groups { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.product-mega-menu__groups section { display: grid; align-content: start; gap: 8px; }
.product-mega-menu__groups a { color: var(--color-muted); font-size: .78rem; }
.product-mega-menu__groups .product-mega-menu__category-title { margin-bottom: 4px; color: var(--color-text); font-size: .81rem; font-weight: 800; }
.product-mega-menu__intro { display: flex; flex-direction: column; align-items: flex-start; color: var(--color-text); }
.product-mega-menu__mobile-all { display: none; }
.product-mega-menu__intro > p { margin: 0 0 8px; color: var(--color-primary-dark); font-size: .72rem; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.product-mega-menu__intro h2 { margin: 0 0 12px; font-size: 1.55rem; line-height: 1.08; }
.product-mega-menu__intro > span { color: var(--color-muted); font-size: .83rem; line-height: 1.55; }
.product-mega-menu__intro > a { display: inline-flex; align-items: center; gap: 8px; margin-top: auto; color: var(--color-primary-dark); font-size: .82rem; font-weight: 850; }
.product-mega-menu__intro > a:hover { color: var(--color-primary); }
.product-mega-menu__intro b { font-size: 1rem; transition: transform .2s ease; }
.product-mega-menu__intro > a:hover b { transform: translateX(3px); }
@media (min-width: 1081px) {
  .nav-products--diamond .product-mega-menu,
  .nav-products--wedding .product-mega-menu,
  .nav-products--custom .product-mega-menu {
    position: fixed;
    top: 84px;
    left: 50%;
    display: grid;
    grid-template-columns: minmax(220px, .82fr) minmax(0, 2.38fr);
    width: min(1140px, calc(100vw - 32px));
    max-height: calc(100vh - 100px);
    gap: 28px;
    padding: 24px;
    transform: translate(-50%, 10px);
  }
  .nav-products--diamond.is-open .product-mega-menu,
  .nav-products--wedding.is-open .product-mega-menu,
  .nav-products--custom.is-open .product-mega-menu { transform: translate(-50%, 0); }
  .product-mega-menu--diamond .product-mega-menu__intro,
  .product-mega-menu--wedding .product-mega-menu__intro,
  .product-mega-menu--custom .product-mega-menu__intro {
    min-height: 100%;
    padding: 26px 24px;
    border-radius: 14px;
    background: #f7f1de;
  }
  .product-mega-menu--diamond .product-mega-menu__groups { grid-template-columns: repeat(3, minmax(0, 1fr)); column-gap: 22px; row-gap: 24px; }
  .nav-products--wedding .product-mega-menu,
  .nav-products--custom .product-mega-menu { grid-template-columns: minmax(220px, .82fr) minmax(280px, 1.18fr); width: min(780px, calc(100vw - 32px)); }
  .product-mega-menu--wedding .product-mega-menu__groups,
  .product-mega-menu--custom .product-mega-menu__groups { grid-template-columns: 1fr; gap: 14px; }
}
.button--header { min-height: 46px; padding: 11px 17px; font-size: .8rem; white-space: nowrap; }
.nav-toggle { display: none; }
@media (max-width: 1280px) { .button--header { display: none; } }
@media (max-width: 1080px) { .site-header__inner { width: min(100% - 32px, 1280px); min-height: 68px; } .site-logo img { width: 155px; } .nav-toggle { display: grid; gap: 4px; width: 42px; height: 42px; place-content: center; padding: 0; border: 0; border-radius: 50%; background: var(--color-soft); } .nav-toggle span:not(.sr-only) { width: 18px; height: 2px; background: var(--color-text); } .site-navigation { position: absolute; top: calc(100% + 1px); right: 0; left: 0; display: none; padding: 18px 16px; border-bottom: 1px solid var(--color-line); background: #fff; } .site-header.is-menu-open .site-navigation { display: block; } .site-navigation__list { display: grid; gap: 0; } .site-navigation__list > li { border-bottom: 1px solid var(--color-line); } .site-navigation__list > li > a, .nav-products__trigger { display: flex; width: 100%; justify-content: space-between; padding: 15px 0; } .product-mega-menu, .nav-products--diamond .product-mega-menu, .nav-products--wedding .product-mega-menu, .nav-products--lab-grown .product-mega-menu, .nav-products--custom .product-mega-menu { position: static; display: none; width: 100%; max-height: 60vh; padding: 0 0 18px; border: 0; border-radius: 0; visibility: visible; opacity: 1; box-shadow: none; transform: none; } .nav-products.is-open .product-mega-menu { display: grid; transform: none; } .product-mega-menu--diamond .product-mega-menu__intro, .product-mega-menu--wedding .product-mega-menu__intro, .product-mega-menu--custom .product-mega-menu__intro { display: none; } .product-mega-menu--diamond .product-mega-menu__mobile-all, .product-mega-menu--wedding .product-mega-menu__mobile-all, .product-mega-menu--custom .product-mega-menu__mobile-all { display: inline-flex; align-items: center; gap: 8px; padding: 2px 0 18px; border-bottom: 1px solid var(--color-line); color: var(--color-primary-dark); font-size: .82rem; font-weight: 850; } .product-mega-menu--diamond .product-mega-menu__mobile-all b, .product-mega-menu--wedding .product-mega-menu__mobile-all b, .product-mega-menu--custom .product-mega-menu__mobile-all b { font-size: 1rem; } .product-mega-menu__groups { grid-template-columns: 1fr; gap: 18px; } }