/* ============================================================
   SmartOBJX Navigation
   Sticky nav bar with mega-menu dropdown + mobile hamburger.
   ============================================================ */

/* ---- Nav Bar ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ---- Brand ---- */
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--color-text);
}

.nav-logo {
  display: block;
  height: 80px;
  width: auto;
  max-width: min(325px, 42vw);
}

.nav-logo--footer {
  height: 44px;
  max-width: 220px;
}

/* ---- Desktop Links ---- */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition:
    color var(--duration-fast) var(--ease-default),
    background-color var(--duration-fast) var(--ease-default);
}

.nav-link:hover {
  color: var(--color-text);
  background-color: var(--color-surface-alt);
  text-decoration: none;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-link[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
}

/* ---- Mega-menu Trigger ---- */
.nav-dropdown {
  position: relative;
}

.nav-dropdown .nav-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-fast) var(--ease-default);
}

.nav-dropdown.is-open .nav-link svg {
  transform: rotate(180deg);
}

/* ---- Mega-menu Panel ---- */
.mega-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  width: 640px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-default),
    visibility var(--duration-normal) var(--ease-default);
}

.nav-dropdown.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
}

.mega-menu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
}

.mega-menu-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: background-color var(--duration-fast) var(--ease-default);
}

.mega-menu-item:hover {
  background-color: var(--color-surface-alt);
  text-decoration: none;
}

.mega-menu-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.mega-menu-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(59, 130, 246, 0.08);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  flex-shrink: 0;
}

.mega-menu-icon svg {
  width: 20px;
  height: 20px;
}

.mega-menu-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mega-menu-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.mega-menu-desc {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* ---- Nav CTA Button ---- */
.btn-nav-cta {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  margin-left: var(--space-2);
}

.btn-nav-cta:hover {
  text-decoration: none;
}

/* ---- Mobile Hamburger ---- */
.nav-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: background-color var(--duration-fast) var(--ease-default);
}

.nav-hamburger:hover {
  background-color: var(--color-surface-alt);
}

.nav-hamburger:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-hamburger svg {
  width: 24px;
  height: 24px;
}

.hamburger-close {
  display: none;
}

.nav-open .hamburger-open {
  display: none;
}

.nav-open .hamburger-close {
  display: block;
}

/* ---- Mobile Overlay ---- */
.nav-overlay {
  display: none;
}

/* ---- Mobile Styles ---- */
@media (max-width: 768px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    right: 0;
    width: 300px;
    height: calc(100dvh - var(--nav-height));
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4);
    background-color: var(--color-surface);
    border-left: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-default);
    overflow-y: auto;
  }

  .nav-open .nav-links {
    transform: translateX(0);
  }

  .nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    top: var(--nav-height);
    background-color: rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--duration-slow) var(--ease-default),
      visibility var(--duration-slow) var(--ease-default);
    z-index: 999;
  }

  .nav-open .nav-overlay {
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    border-radius: var(--radius-md);
  }

  /* Mobile mega-menu: inline accordion */
  .mega-menu {
    position: static;
    transform: none;
    width: 100%;
    border: none;
    box-shadow: none;
    padding: 0 0 0 var(--space-4);
    max-height: 0;
    overflow: hidden;
    transition:
      max-height var(--duration-slow) var(--ease-default),
      opacity var(--duration-normal) var(--ease-default);
  }

  .nav-dropdown.is-open .mega-menu {
    max-height: 600px;
    padding: var(--space-2) 0 var(--space-2) var(--space-4);
  }

  .mega-menu-grid {
    grid-template-columns: 1fr;
  }
}