/* ==========================================================================
   xk3s Unified Global Header & Navigation Drawer System (HeaderNav)
   1:1 Match to xk3s.com Mission Center Overlay Behavior & UX
   ========================================================================== */

:root {
  --nav-bg-header: rgba(246, 248, 250, 0.96);
  --nav-bg-surface: #ffffff;
  --nav-bg-elevated: #f8fafc;
  --nav-bg-hover: #f1f3f5;
  --nav-border-subtle: rgba(0, 0, 0, 0.08);
  --nav-border-medium: rgba(0, 0, 0, 0.16);
  --nav-text-main: #1c1d1f;
  --nav-text-muted: #5e6066;
  --nav-text-dim: #8c8e94;
  --nav-accent-blue: #1c71d8;
  --nav-accent-blue-bg: rgba(28, 113, 216, 0.08);
  --nav-accent-blue-border: rgba(28, 113, 216, 0.35);
  --nav-radius-btn: 10px;
  --nav-radius-pill: 9999px;
  --nav-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --nav-font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
}

/* Ensure body starts at 0 without margins pushing the sticky header */
body {
  margin: 0 !important;
  padding-top: 0 !important;
}

/* ==========================================================================
   1. STICKY TOP HEADER SHELL
   ========================================================================== */
.header-nav,
header.header-nav,
.xk3s-header-nav {
  position: sticky !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  width: 100% !important;
  z-index: 9999 !important;
  background: var(--nav-bg-header) !important;
  backdrop-filter: blur(20px) !important;
  -webkit-backdrop-filter: blur(20px) !important;
  border-bottom: 1px solid var(--nav-border-subtle) !important;
  box-sizing: border-box !important;
  font-family: var(--nav-font) !important;
  color: var(--nav-text-main) !important;
}

.nav-inner,
.xk3s-nav-inner {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  width: 100% !important;
  max-width: 1440px !important;
  margin: 0 auto !important;
  height: 64px !important;
  min-height: 64px !important;
  padding: 0 20px !important;
  box-sizing: border-box !important;
  gap: 16px !important;
}

/* Left: Branding Block (Logo + Title + Subtitle) */
.brand-group,
.xk3s-brand-group {
  display: inline-flex !important;
  align-items: center !important;
  gap: 12px !important;
  text-decoration: none !important;
  color: var(--nav-text-main) !important;
  flex-shrink: 0 !important;
  cursor: pointer !important;
  transition: opacity 0.15s ease, transform 0.15s ease !important;
}

.brand-group:hover,
.xk3s-brand-group:hover {
  opacity: 0.92;
}

.brand-logo,
.xk3s-brand-logo {
  width: 36px !important;
  height: 36px !important;
  border-radius: var(--nav-radius-btn) !important;
  background: #ffffff !important;
  border: 1px solid var(--nav-border-subtle) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05) !important;
  flex-shrink: 0 !important;
  overflow: hidden !important;
}

.brand-logo img,
.xk3s-brand-logo img {
  display: block !important;
  width: 28px !important;
  height: 28px !important;
  pointer-events: none !important;
}

.brand-title-wrap,
.xk3s-brand-title-wrap {
  display: flex !important;
  flex-direction: column !important;
  line-height: 1.2 !important;
}

.brand-name,
.xk3s-brand-name {
  display: block !important;
  font-size: 1.15rem !important;
  font-weight: 800 !important;
  letter-spacing: -0.02em !important;
  color: var(--nav-text-main) !important;
}

.brand-tag,
.xk3s-brand-tag {
  display: block !important;
  font-size: 0.68rem !important;
  font-weight: 600 !important;
  color: var(--nav-text-muted) !important;
  text-transform: uppercase !important;
  letter-spacing: 0.04em !important;
  font-family: var(--nav-font-mono) !important;
}

/* ==========================================================================
   2. DESKTOP VS MOBILE NAV VISIBILITY (Break at 900px)
   ========================================================================== */
.mobile-nav-controls {
  display: none;
}

@media (max-width: 900px) {
  .desktop-nav,
  .nav-actions.desktop-nav,
  .header-actions.desktop-nav,
  .badge-deck.desktop-nav,
  .nav-search.desktop-nav {
    display: none !important;
  }

  .mobile-nav-controls {
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
  }
}

/* Clean Rounded Hamburger Button */
.mobile-menu-toggle,
.xk3s-hamburger-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 40px !important;
  height: 40px !important;
  border-radius: var(--nav-radius-btn) !important;
  border: 1px solid var(--nav-border-medium) !important;
  background: var(--nav-bg-surface) !important;
  color: var(--nav-text-main) !important;
  cursor: pointer !important;
  transition: all 0.15s ease !important;
  padding: 0 !important;
  flex-shrink: 0 !important;
  outline: none !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04) !important;
}

.mobile-menu-toggle:hover,
.xk3s-hamburger-btn:hover {
  background: var(--nav-bg-hover) !important;
  border-color: var(--nav-accent-blue-border) !important;
  color: var(--nav-accent-blue) !important;
}

.mobile-menu-toggle:active,
.xk3s-hamburger-btn:active {
  transform: scale(0.95) !important;
}

.mobile-menu-toggle svg,
.xk3s-hamburger-btn svg {
  display: block;
  stroke: currentColor;
}

/* ==========================================================================
   3. MOBILE NAVIGATION DRAWER & BACKDROP (1:1 with xk3s.com)
   ========================================================================== */
/* Backdrop Dimmer */
.mobile-nav-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 9998;
}

.mobile-nav-backdrop.open {
  display: block !important;
}

/* Drop-Down Drawer (Positioned under sticky header bar) */
.mobile-nav-drawer {
  display: none;
  flex-direction: column;
  background: var(--nav-bg-surface) !important;
  border-top: 1px solid var(--nav-border-subtle) !important;
  border-bottom: 1px solid var(--nav-border-medium) !important;
  padding: 14px 16px 20px !important;
  gap: 12px !important;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.2) !important;
  width: 100% !important;
  box-sizing: border-box !important;
  max-height: calc(100vh - 64px) !important;
  overflow-y: auto !important;
  -webkit-overflow-scrolling: touch !important;
  position: relative !important;
  z-index: 9999 !important;
}

.mobile-nav-drawer.open {
  display: flex !important;
  animation: drawerSlideDown 0.2s ease-out !important;
}

@keyframes drawerSlideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Search Box Inside Drawer */
.mobile-search-wrap {
  position: relative !important;
  width: 100% !important;
  box-sizing: border-box !important;
}

.mobile-search-wrap input,
#mobileSearchInput {
  width: 100% !important;
  height: 42px !important;
  background: var(--nav-bg-elevated) !important;
  border: 1px solid var(--nav-border-medium) !important;
  border-radius: var(--nav-radius-pill) !important;
  padding: 0 16px 0 40px !important;
  font-family: var(--nav-font) !important;
  font-size: 16px !important; /* Prevents auto-zoom in iOS Safari */
  color: var(--nav-text-main) !important;
  outline: none !important;
  box-sizing: border-box !important;
  transition: border-color 0.15s ease, box-shadow 0.15s ease !important;
}

.mobile-search-wrap input:focus,
#mobileSearchInput:focus {
  border-color: var(--nav-accent-blue) !important;
  box-shadow: 0 0 0 3px var(--nav-accent-blue-bg) !important;
  background: #ffffff !important;
}

.mobile-search-icon {
  position: absolute !important;
  left: 14px !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
  color: var(--nav-text-dim) !important;
  pointer-events: none !important;
}

/* Mobile Links List */
.mobile-links-list {
  display: flex !important;
  flex-direction: column !important;
  gap: 6px !important;
  width: 100% !important;
  box-sizing: border-box !important;
}

.mobile-nav-link {
  display: flex !important;
  align-items: center !important;
  gap: 12px !important;
  padding: 10px 14px !important;
  border-radius: var(--nav-radius-btn) !important;
  font-size: 0.92rem !important;
  font-weight: 600 !important;
  color: var(--nav-text-muted) !important;
  background: var(--nav-bg-surface) !important;
  border: 1px solid var(--nav-border-subtle) !important;
  text-decoration: none !important;
  box-sizing: border-box !important;
  transition: all 0.15s ease !important;
  cursor: pointer !important;
  -webkit-tap-highlight-color: transparent !important;
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
  color: var(--nav-text-main) !important;
  background: var(--nav-bg-hover) !important;
  border-color: var(--nav-border-medium) !important;
  transform: translateX(2px);
}

.mobile-nav-link.active-page,
.mobile-nav-link.is-active {
  background: var(--nav-accent-blue-bg) !important;
  border-color: var(--nav-accent-blue-border) !important;
  color: var(--nav-accent-blue) !important;
  font-weight: 700 !important;
}

.mobile-nav-badge {
  margin-left: auto !important;
  font-size: 0.65rem !important;
  font-weight: 700 !important;
  text-transform: uppercase !important;
  letter-spacing: 0.05em !important;
  padding: 2px 7px !important;
  border-radius: 9999px !important;
  background: var(--nav-accent-blue) !important;
  color: #ffffff !important;
}

.mobile-nav-arrow {
  margin-left: auto !important;
  font-size: 0.95rem !important;
  color: var(--nav-text-dim) !important;
  font-weight: 400 !important;
}

.mobile-nav-no-results {
  display: none;
  padding: 16px;
  text-align: center;
  font-size: 0.86rem;
  color: var(--nav-text-dim);
  font-style: italic;
}