.site-header { position: sticky; z-index: 40; top: 0; border-bottom: 1px solid rgba(51, 51, 51, .08); background: rgba(255, 255, 255, .88); -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); transition: background-color .32s ease, border-color .32s ease, box-shadow .32s ease; }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; width: min(1280px, calc(100% - 40px)); min-height: 76px; margin: 0 auto; gap: 24px; transition: min-height .32s ease; }
.site-logo { display: inline-flex; align-items: center; gap: 9px; color: var(--color-text); font-size: 1.2rem; font-weight: 900; letter-spacing: .08em; transition: font-size .32s ease, gap .32s ease; }
.site-header .site-logo__image { display: block; width: clamp(50px, 4.6vw, 58px); height: auto; border-radius: 8px; }
.site-logo__mark { display: grid; width: 30px; height: 30px; place-items: center; border-radius: 50%; color: #fff; background: var(--color-primary-dark); font-size: .86rem; letter-spacing: 0; transition: width .32s ease, height .32s ease, font-size .32s ease, transform .32s ease; }
.site-navigation__list { display: flex; align-items: center; gap: 30px; margin: 0; padding: 0; list-style: none; }
.site-navigation a, .nav-products__trigger { color: var(--color-text); font-size: .86rem; font-weight: 750; }
.site-navigation a:hover, .nav-products__trigger:hover { color: var(--color-primary-dark); }
.nav-products__trigger { display: inline-flex; gap: 8px; align-items: center; padding: 27px 0; border: 0; background: transparent; transition: padding .32s ease, color .2s ease; }
.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:hover .nav-products__trigger::after, .nav-products:focus-within .nav-products__trigger::after, .nav-products.is-open .nav-products__trigger::after { margin-top: 3px; transform: rotate(225deg); }
.nav-products { position: relative; }
.product-mega-menu { position: absolute; top: calc(100% + 8px); left: -430px; display: grid; grid-template-columns: 220px minmax(0, 1fr); width: min(1120px, calc(100vw - 40px)); max-height: calc(100vh - 106px); padding: 24px; 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:hover .product-mega-menu, .nav-products:focus-within .product-mega-menu, .nav-products.is-open .product-mega-menu { visibility: visible; opacity: 1; transform: translateY(0); }
.product-mega-menu__intro { padding: 18px; border-radius: 14px; color: #fff; background: var(--color-primary-dark); }
.product-mega-menu__intro .eyebrow { color: #fff8eb; }
.product-mega-menu__intro p:not(.eyebrow) { font-size: .85rem; }
.product-mega-menu__intro a { color: #fff; font-size: .83rem; font-weight: 800; }
.product-mega-menu__groups { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 26px 20px; padding: 5px 0 5px 28px; }
.product-mega-menu__groups section { display: grid; align-content: start; gap: 8px; }
.product-mega-menu__groups a { font-size: .72rem; color: var(--color-muted); line-height: 1.35; }
.product-mega-menu__groups .product-mega-menu__title { margin-bottom: 4px; color: var(--color-text); font-size: .87rem; font-weight: 800; }
.product-mega-menu__groups .product-mega-menu__subhead { margin-top: 6px; color: var(--color-text); font-size: .76rem; font-weight: 700; }
.product-mega-menu__groups section > .product-mega-menu__subhead:first-of-type { margin-top: 0; }
.product-mega-menu__groups .product-mega-menu__nested { padding-left: 12px; }
.button--header { min-height: 42px; padding: 9px 16px; font-size: .73rem; white-space: nowrap; transition: min-height .32s ease, padding .32s ease, background-color .2s ease, color .2s ease, transform .2s ease; }
.site-header.is-scrolled { border-bottom-color: rgba(255, 255, 255, .42); background: rgba(255, 255, 255, .7); box-shadow: 0 12px 32px rgba(51, 51, 51, .1); }
.site-header.is-scrolled .site-header__inner { min-height: 62px; }
.site-header.is-scrolled .site-logo { gap: 8px; font-size: 1.08rem; }
.site-header.is-scrolled .site-logo__image { width: clamp(46px, 4vw, 52px); }
.site-header.is-scrolled .site-logo__mark { width: 27px; height: 27px; font-size: .76rem; transform: rotate(-6deg); }
.site-header.is-scrolled .nav-products__trigger { padding: 20px 0; }
.site-header.is-scrolled .button--header { min-height: 38px; padding: 8px 14px; }
.nav-toggle { display: none; }
@media (max-width: 1100px) { .site-header__inner { width: min(100% - 32px, 1280px); min-height: 68px; } .site-header.is-scrolled .site-header__inner { min-height: 60px; } .nav-toggle { display: grid; gap: 4px; width: 42px; height: 42px; place-content: center; padding: 0; border: 0; border-radius: 50%; background: var(--color-soft); transition: width .32s ease, height .32s ease, background-color .2s ease; } .site-header.is-scrolled .nav-toggle { width: 38px; height: 38px; } .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; max-height: calc(100vh - 69px); padding: 18px 16px; overflow-y: auto; 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; } .nav-products__trigger { padding: 15px 0; } .site-header.is-scrolled .nav-products__trigger { padding: 15px 0; } .product-mega-menu { position: static; display: none; width: 100%; max-height: none; grid-template-columns: 1fr; padding: 0 0 18px; overflow: visible; border: 0; border-radius: 0; box-shadow: none; visibility: visible; opacity: 1; transform: none; } .nav-products.is-open .product-mega-menu { display: grid; } .product-mega-menu__intro { display: none; } .product-mega-menu__groups { grid-template-columns: 1fr 1fr; padding: 0; } .button--header { display: none; } }
@media (max-width: 640px) { .site-logo { font-size: 1rem; } .site-header .site-logo__image { width: 48px; } .site-header.is-scrolled .site-logo { font-size: .94rem; } .site-header.is-scrolled .site-logo__image { width: 44px; } .product-mega-menu__groups { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { .site-header, .site-header__inner, .site-logo, .site-logo__mark, .nav-products__trigger, .button--header, .nav-toggle { transition: none; } .site-header.is-scrolled .site-logo__mark { transform: none; } }

/* Dark header frame 2026-08-23 */
.site-header { border-bottom: 1px solid rgba(255,255,255,.08); background: rgba(28, 25, 20, .92); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
.site-navigation__list > li > a, .nav-products__trigger { color: #F2EDE3; }
.site-navigation__list > li > a:hover, .nav-products__trigger:hover { color: #E8C88F; }
.site-header.is-scrolled { border-bottom-color: rgba(255,255,255,.12); background: rgba(24, 21, 17, .94); box-shadow: 0 12px 32px rgba(0,0,0,.35); }
.nav-toggle { background: rgba(255,255,255,.10); }
.nav-toggle span:not(.sr-only) { background: #F2EDE3; }
@media (max-width: 1100px) {
  .site-navigation { border-bottom-color: rgba(255,255,255,.1); background: #241f19; }
  .site-navigation__list > li { border-bottom-color: rgba(255,255,255,.09); }
  .product-mega-menu { background: transparent; }
  .product-mega-menu__groups a { color: rgba(255,255,255,.75); }
  .product-mega-menu__groups .product-mega-menu__title, .product-mega-menu__groups .product-mega-menu__subhead { color: #F2EDE3; }
}