/* BpExch — navbar + mobile menu */
/* =========================================================================
   NAVBAR
   ========================================================================= */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 50;
  transition: padding var(--t-slow), background var(--t-slow);
  padding: 1rem 0;
  background: transparent;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0.75rem 0.6rem 1rem;
  border-radius: var(--r-pill);
  background: rgba(3, 18, 12, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow:
    0 0 0 1px rgba(4, 120, 87, 0.08) inset,
    0 8px 32px rgba(0, 0, 0, 0.45),
    0 2px 8px rgba(0, 0, 0, 0.3);
  --text-strong: #fff;
}
.site-header.scrolled .nav-bar {
  background: rgba(3, 18, 12, 0.62);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow:
    0 0 0 1px rgba(4, 120, 87, 0.08) inset,
    0 4px 16px rgba(0, 0, 0, 0.3);
}

/* ---------- Brand ---------- */
.brand {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  flex-shrink: 0;
}
.brand-logo {
  height: 36px;
  width: 36px;
  display: block;
  object-fit: cover;
  border-radius: var(--r-pill);
  box-shadow:
    0 0 0 2px rgba(4, 120, 87, 0.35),
    0 4px 12px rgba(4, 120, 87, 0.22);
}
.brand-text {
  font-size: 1.3rem;
  font-weight: 900;
  font-family: var(--app-font-heading);
  color: #ffffff;
  letter-spacing: -0.03em;
  line-height: 1;
}
.brand-text .grad {
  background-image: linear-gradient(135deg, var(--green-bright), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand-underline {
  display: none;
}

/* ---------- Nav links ---------- */
.nav-links {
  display: none;
  align-items: center;
  gap: 0.1rem;
  flex: 1;
  min-width: 0;
  justify-content: center;
}
.nav-item {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.52rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.65);
  border-radius: var(--r-pill);
  letter-spacing: 0.01em;
  white-space: nowrap;
  text-transform: uppercase;
  transition: color var(--t-ui), background var(--t-ui);
}
.nav-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.07);
}
.nav-link.active,
.nav-link[aria-current] {
  color: var(--green-bright);
}
.nav-link::after {
  display: none;
}
.nav-item.has-children .nav-link {
  padding-right: 0.4rem;
}

/* ---------- Submenu toggle ---------- */
.nav-sub-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: -0.1rem;
  padding: 0.45rem 0.5rem 0.45rem 0.1rem;
  color: rgba(255, 255, 255, 0.5);
  border-radius: var(--r-pill);
  transition: color var(--t-ui), background var(--t-ui);
}
.nav-item.has-children:hover .nav-sub-toggle,
.nav-item.has-children:focus-within .nav-sub-toggle,
.nav-sub-toggle[aria-expanded='true'] {
  color: #ffffff;
}
.nav-sub-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
}
.nav-sub-toggle[aria-expanded='true'] svg,
.nav-item.has-children:hover .nav-sub-toggle svg,
.nav-item.has-children:focus-within .nav-sub-toggle svg {
  transform: rotate(180deg);
}
.nav-sub-toggle svg {
  transition: transform var(--t-ui);
}

/* ---------- Dropdown submenu ----------
   top sits flush at 100% (no gap) — a floating gap between the trigger and
   the panel is a dead zone where :hover is lost while the pointer crosses
   it, so the menu can close before the mouse ever reaches the submenu.
   The old visual gap is recreated with padding-top instead, which is part
   of the hoverable box and can't be "missed". */
.nav-submenu {
  position: absolute;
  top: 100%;
  left: 50%;
  /* Shrink-wraps to content instead of a fixed size, and always lays out
     two items per row — same rule the Latest Posts mega menu uses. */
  width: max-content;
  min-width: 230px;
  max-width: min(620px, 92vw);
  padding: 1.25rem 0.5rem 0.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(170px, 290px));
  gap: 0.15rem;
  background: rgba(3, 18, 12, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-2);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(4, 120, 87, 0.08) inset;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) translateY(0);
  transition:
    opacity var(--t-ui),
    transform var(--t-ui),
    visibility 0s linear 0.22s;
  z-index: 15;
}
.nav-submenu .nav-item {
  display: flex;
  width: 100%;
  justify-content: space-between;
}
.nav-submenu .nav-link {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: var(--text-sm);
  white-space: normal;
  line-height: 1.45;
  text-transform: none;
  letter-spacing: 0;
}
.nav-submenu .nav-sub-toggle {
  margin-left: 0;
  padding-right: 0.65rem;
}
.nav-submenu .nav-submenu {
  top: -0.5rem;
  left: 100%;
  /* Same fix as above, applied horizontally: flush left edge + padding
     instead of a detached gap, so crossing into the nested panel can't
     drop out of :hover partway there. */
  padding: 0.5rem 0.5rem 0.5rem 1.15rem;
  transform: translateX(0);
}
.nav-item.has-children:hover > .nav-submenu,
.nav-item.has-children:focus-within > .nav-submenu,
.nav-item.has-children.open > .nav-submenu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
  transition:
    opacity var(--t-ui),
    transform var(--t-ui),
    visibility 0s linear 0s;
}
.nav-submenu .nav-item.has-children:hover > .nav-submenu,
.nav-submenu .nav-item.has-children:focus-within > .nav-submenu,
.nav-submenu .nav-item.has-children.open > .nav-submenu {
  transform: translateX(0);
}

/* ---------- Latest Posts mega menu ----------
   Wider variant of .nav-submenu. Right-aligned instead of centered under
   the trigger — this item sits near the right edge of the nav, and a wide
   centered panel would run off the viewport. Text-only cards, no thumbnails. */
.nav-mega {
  left: auto;
  right: -1rem;
  /* Shrink-wrap to the grid's natural content width instead of a fixed
     size — fewer/shorter post titles give a narrower panel, longer ones
     grow it, always bounded by min/max so it can't collapse or overflow. */
  width: max-content;
  min-width: 420px;
  max-width: min(820px, 94vw);
  padding: 1.25rem 1.25rem 1rem;
  transform: translateX(0);
  /* .nav-mega's own direct children are .mega-menu-grid + the "View All
     Posts" link, which must stack (not inherit the base .nav-submenu's
     2-column item grid — that's for simple submenus, not this one). The
     post cards get their own 2-column grid via .mega-menu-grid below. */
  display: block;
}
.nav-item.has-mega:hover > .nav-submenu,
.nav-item.has-mega:focus-within > .nav-submenu,
.nav-item.has-mega.open > .nav-submenu {
  transform: translateX(0);
}
.mega-menu-grid {
  display: grid;
  /* Always exactly 2 cards per row; each column sizes to its own content
     (between 220 and 340px) rather than stretching to fill a fixed track. */
  grid-template-columns: repeat(2, minmax(220px, 340px));
  gap: 0.6rem;
}
.mega-post-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.85rem 0.9rem;
  border-radius: var(--r-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
  text-decoration: none;
  min-width: 0;
  transition: background var(--t-ui), border-color var(--t-ui);
}
.mega-post-card:hover {
  background: rgba(4, 120, 87, 0.1);
  border-color: rgba(4, 120, 87, 0.28);
}
.mega-post-cat {
  padding: 0.15rem 0.55rem;
  border-radius: var(--r-pill);
  background: rgba(4, 120, 87, 0.16);
  border: 1px solid rgba(4, 120, 87, 0.3);
  color: var(--green-bright);
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.mega-post-title {
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.82);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--t-ui);
}
.mega-post-card:hover .mega-post-title {
  color: #ffffff;
}
.mega-menu-viewall {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  width: 100%;
  margin-top: 1rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--green-bright);
  transition: color var(--t-ui);
}
.mega-menu-viewall:hover {
  color: #ffffff;
}

/* ---------- CTA ---------- */
.nav-cta {
  display: none;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}
.nav-signup {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.6rem 1.15rem;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--on-green);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0) 42%),
    linear-gradient(135deg, var(--green-bright) 0%, var(--green) 58%, var(--green-dark) 100%);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--r-pill);
  letter-spacing: 0.01em;
  transition: all var(--t-ui);
  box-shadow:
    0 14px 30px -14px rgba(4, 120, 87, 0.72),
    inset 0 1px 0 rgba(255, 255, 255, 0.24);
}
.nav-signup:hover {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22) 0%, rgba(255, 255, 255, 0) 42%),
    linear-gradient(135deg, #14d095 0%, var(--green-bright) 50%, var(--green) 100%);
  box-shadow:
    0 18px 34px -14px rgba(4, 120, 87, 0.8),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}
.nav-signup:active {
  transform: translateY(0);
}

/* ---------- Mobile toggle ---------- */
.nav-toggle {
  display: inline-flex;
  color: rgba(255, 255, 255, 0.8);
  padding: 0.6rem;
  border-radius: var(--r-2);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
  transition: background var(--t-ui), border-color var(--t-ui), color var(--t-ui);
}
.nav-toggle:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.18);
}
.nav-toggle .icon-close {
  display: none;
}
.nav-toggle.open .icon-open {
  display: none;
}
.nav-toggle.open .icon-close {
  display: inline-flex;
}

/* ---------- Mobile menu ---------- */
.mobile-menu {
  display: block;
  margin-top: 0.6rem;
  border-radius: var(--r-xl);
  background: rgba(3, 18, 12, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.09);
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  --text-strong: #fff;
  max-height: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    opacity var(--t-ui),
    visibility 0s linear 0.3s;
}
.mobile-menu.open {
  max-height: calc(100dvh - 6rem);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition:
    max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    opacity var(--t-ui),
    visibility 0s linear 0s;
}
.mobile-menu-inner {
  display: flex;
  flex-direction: column;
  padding: 0.75rem;
  gap: 0.2rem;
}
.mobile-nav-item[data-depth='1'] {
  padding-left: 0.85rem;
}
.mobile-nav-item[data-depth='2'] {
  padding-left: 1.7rem;
}
.mobile-nav-row {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.mobile-link {
  flex: 1;
  font-size: var(--text-md);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  padding: 0.85rem 1rem;
  border-radius: var(--r-2);
  transition: color var(--t-ui), background var(--t-ui);
}
.mobile-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}
.mobile-sub-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: rgba(255, 255, 255, 0.5);
  border-radius: var(--r-2);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  transition: color var(--t-ui), background var(--t-ui), border-color var(--t-ui);
}
.mobile-sub-toggle:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.14);
}
.mobile-sub-toggle svg {
  transition: transform var(--t-ui);
}
.mobile-sub-toggle[aria-expanded='true'] svg {
  transform: rotate(180deg);
}
.mobile-submenu {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition:
    max-height 0.28s cubic-bezier(0.4, 0, 0.2, 1),
    opacity var(--t-ui);
}
.mobile-nav-item.open > .mobile-submenu {
  max-height: calc(100dvh - 10rem);
  opacity: 1;
}
.mobile-cta {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0.85rem 0.25rem 0.25rem;
  margin-top: 0.35rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.mobile-signup {
  text-align: center;
  padding: 0.85rem;
  font-weight: 800;
  font-size: var(--text-md);
  color: var(--on-green);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0) 42%),
    linear-gradient(135deg, var(--green-bright) 0%, var(--green) 58%, var(--green-dark) 100%);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--r-pill);
  box-shadow:
    0 14px 30px -14px rgba(4, 120, 87, 0.72),
    inset 0 1px 0 rgba(255, 255, 255, 0.24);
  transition: background var(--t-ui), box-shadow var(--t-ui);
}
.mobile-signup:hover {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22) 0%, rgba(255, 255, 255, 0) 42%),
    linear-gradient(135deg, #14d095 0%, var(--green-bright) 50%, var(--green) 100%);
  box-shadow:
    0 18px 34px -14px rgba(4, 120, 87, 0.8),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* ---------- Responsive ---------- */
@media (max-width: 767px) {
  .site-header {
    padding: 0.75rem 0;
  }
  .nav-bar {
    padding: 0.55rem 0.65rem 0.55rem 0.85rem;
    border-radius: 1.25rem;
  }
  .brand-text {
    font-size: 1.2rem;
  }
}

@media (min-width: 1024px) {
  .nav-links,
  .nav-cta {
    display: flex;
  }
  .nav-toggle {
    display: none;
  }
  .mobile-menu {
    display: none !important;
  }
}