fix(shell): fine-tune header/footer to zibll contracts

Move nav-fixed to body, apply show-slide overlay tokens, rebuild footer
as zibll template_1 list-inline (logo/links/contact/mini + footer-conter),
and align navbar brand/logo/menu spacing with zibll main.css.

assets/css/frontend/nav/base.css

@@ -1,3 +1,14 @@
+/* Zibll body.nav-fixed: reserve header space then pull hero under nav */
+body.nav-fixed {
+  padding-top: var(--nav-height, 60px);
+}
+
+body.nav-fixed .header-slider-container,
+body.nav-fixed .header-components.slide-header,
+body.nav-fixed .header-components-container {
+  margin-top: calc(var(--nav-height, 60px) * -1);
+}
+
 /* ============================================================
  * AKSRT Navigation — Zibll-aligned
  *
@@ -331,3 +342,125 @@ ul.nav-desktop .sub-menu .sub-menu {
   margin: 0;
 }
 
+
+
+/* ============================================================
+ * Zibll .header.show-slide — transparent gradient over hero
+ * ============================================================ */
+.header.show-slide {
+  --header-bg: linear-gradient(0, rgba(0, 0, 0, 0) 5%, rgba(0, 0, 0, 0.1) 80%);
+  --header-color: #fff;
+  -webkit-backdrop-filter: unset;
+  backdrop-filter: unset;
+}
+
+body.nav-fixed .header.show-slide {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  width: 100%;
+  z-index: 30;
+  background: transparent;
+  box-shadow: none;
+  border: 0;
+}
+
+.header.show-slide .navbar.navbar-top,
+.header.show-slide .site-nav {
+  background: var(--header-bg, transparent);
+  border-bottom-color: transparent;
+  box-shadow: none;
+  color: var(--header-color, #fff);
+  backdrop-filter: none;
+  -webkit-backdrop-filter: none;
+}
+
+.header.show-slide .site-nav:not(.is-scrolled) a,
+.header.show-slide .site-nav:not(.is-scrolled) .icon-btn,
+.header.show-slide .site-nav:not(.is-scrolled) .site-brand__name {
+  color: #fff;
+}
+
+.header.show-slide .site-nav.is-scrolled,
+.site-nav.is-scrolled {
+  background: var(--blur-bg);
+  color: var(--header-color, var(--color-ink-2));
+  border-bottom-color: rgba(255, 255, 255, 0.45);
+  backdrop-filter: saturate(5) blur(20px);
+  -webkit-backdrop-filter: saturate(5) blur(20px);
+  box-shadow: 0 4px 10px var(--main-shadow, rgba(116, 116, 116, 0.08));
+}
+
+.navbar.navbar-top {
+  margin: 0;
+  border-radius: 0 !important;
+  font-size: 15px;
+}
+
+.container-header,
+.container-footer {
+  max-width: calc(var(--mian-max-width, var(--container, 1200px)) + 180px);
+  margin-left: auto;
+  margin-right: auto;
+  width: 100%;
+  padding-left: 15px;
+  padding-right: 15px;
+}
+
+.navbar-top .navbar-brand {
+  padding: 7px 10px;
+}
+
+.navbar-logo > img,
+.navbar-logo .site-brand__logo-img,
+.site-brand__logo-img {
+  height: 36px !important;
+  width: auto !important;
+  max-width: 180px;
+  padding: 0;
+  object-fit: contain;
+}
+
+.navbar-top .navbar-nav,
+.navbar-top ul.nav-desktop {
+  margin-left: 20px;
+  margin-right: 20px;
+  display: flex;
+  align-items: center;
+  gap: 0;
+  list-style: none;
+  padding: 0;
+}
+
+.navbar-top .navbar-nav > li > a,
+.navbar-top ul.nav-desktop > li > a {
+  padding-left: 10px;
+  padding-right: 10px;
+  border-radius: 4px;
+  display: inline-flex !important;
+  align-items: center;
+  min-height: 36px;
+  font-size: 15px;
+}
+
+.navbar-top .site-nav__row {
+  display: flex;
+  align-items: center;
+  width: 100%;
+  min-height: var(--nav-height, 60px);
+}
+
+.navbar-top .nav-actions {
+  margin-left: auto;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.scroll-down.nav-fixed .header.scroll-down-hide,
+body.scroll-down.nav-fixed .header.scroll-down-hide {
+  transform: translate3d(0, -105%, 0);
+  -webkit-backdrop-filter: none;
+  backdrop-filter: none;
+}