/* ============================================================
   3R GEEKS — Navigation
   Sticky header: transparent on hero, transitions to white on scroll.
   Mobile hamburger with accordion Services dropdown.
   Depends on: tokens.css
   ============================================================ */


/* ── Site Header ─────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--header-height-sm);

  /* Transparent start state */
  background-color: transparent;
  border-bottom: 1px solid transparent;

  transition:
    background-color  var(--transition-slow),
    border-color      var(--transition-slow),
    box-shadow        var(--transition-slow),
    height            var(--transition-base);
}

@media (min-width: 768px) {
  .site-header { height: var(--header-height); }
}

/* Scrolled state — triggered by JS adding .is-scrolled */
.site-header.is-scrolled {
  background-color: var(--color-bg);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

/* Non-hero pages start with white header immediately */
.site-header.is-opaque {
  background-color: var(--color-bg);
  border-color: var(--color-border);
}


/* ── Header inner ────────────────────────────────────────── */
.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding-inline: var(--space-6);
  max-width: var(--container-wide);
  margin-inline: auto;
}

@media (min-width: 768px) {
  .site-header__inner { padding-inline: var(--space-8); }
}

@media (min-width: 1200px) {
  .site-header__inner { padding-inline: var(--space-12); }
}


/* ── Logo ────────────────────────────────────────────────── */
.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.site-logo img {
  height: 44px;
  width: auto;
  transition: opacity var(--transition-fast);
}

@media (min-width: 768px) {
  .site-logo img { height: 52px; }
}

/* Logo: white is default (transparent header); swap to color on scroll */
.site-logo .logo--color { display: none; }
.site-logo .logo--white { display: block; }

.site-header.is-scrolled .site-logo .logo--white,
.site-header.is-opaque   .site-logo .logo--white { display: none; }
.site-header.is-scrolled .site-logo .logo--color,
.site-header.is-opaque   .site-logo .logo--color { display: block; }


/* ── Desktop Nav ─────────────────────────────────────────── */
.site-nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

@media (min-width: 900px) {
  .site-nav { display: flex; }
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--nav-link-color);
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-xlight);
}

.site-nav__link.is-active {
  color: var(--color-secondary);
}

/* Nav on transparent header — white text */
.site-header:not(.is-scrolled):not(.is-opaque) .site-nav__link {
  color: rgba(255,255,255,.90);
}
.site-header:not(.is-scrolled):not(.is-opaque) .site-nav__link:hover {
  color: #ffffff;
  background-color: rgba(255,255,255,.12);
}

/* Dropdown chevron */
.site-nav__chevron {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-base);
}

.site-nav__item:hover .site-nav__chevron,
.site-nav__item.is-open .site-nav__chevron {
  transform: rotate(180deg);
}


/* ── Services Dropdown ───────────────────────────────────── */
.site-nav__dropdown {
  display: none;
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  min-width: 260px;
  background: #ffffff;  /* always white — never inherits transparent header */
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  list-style: none;
  z-index: var(--z-dropdown);

  /* Animation */
  opacity: 0;
  transform: translateX(-50%) translateY(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
  pointer-events: none;
}

.site-nav__item:hover .site-nav__dropdown,
.site-nav__item.is-open .site-nav__dropdown {
  display: block;
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.site-nav__dropdown-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: #353635;  /* always graphite — never inherits transparent header white */
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  line-height: var(--leading-snug);
}

.site-nav__dropdown-link:hover {
  background-color: var(--color-primary-xlight);
  color: var(--color-secondary);
}

.site-nav__dropdown-link strong {
  display: block;
  font-weight: var(--weight-semibold);
  color: #175861;  /* always dark teal */
  margin-bottom: 2px;
}

.site-nav__dropdown-link span {
  font-size: var(--text-xs);
  color: #718096;  /* always muted gray */
}


/* ── CTA Button in Nav ───────────────────────────────────── */
.site-nav__cta {
  margin-left: var(--space-4);
}

/* CTA on transparent header gets ghost style */
.site-header:not(.is-scrolled):not(.is-opaque) .site-nav__cta .btn--primary {
  background-color: rgba(255,255,255,.15);
  border-color: rgba(255,255,255,.6);
  color: #ffffff;
  box-shadow: none;
}
.site-header:not(.is-scrolled):not(.is-opaque) .site-nav__cta .btn--primary:hover {
  background-color: rgba(255,255,255,.25);
  border-color: #ffffff;
}


/* ── Hamburger button ────────────────────────────────────── */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  cursor: pointer;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

@media (min-width: 900px) {
  .hamburger { display: none; }
}

.hamburger:hover {
  background-color: rgba(255,255,255,.12);
}
.site-header.is-scrolled .hamburger:hover,
.site-header.is-opaque .hamburger:hover {
  background-color: var(--color-bg-muted);
}

.hamburger__bar {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: var(--radius-full);
  background-color: rgba(255,255,255,.9);
  transform-origin: center;
  transition: transform var(--transition-base), opacity var(--transition-fast), background-color var(--transition-fast);
}

/* Bar color on scrolled/opaque header */
.site-header.is-scrolled .hamburger__bar,
.site-header.is-opaque .hamburger__bar {
  background-color: var(--color-graphite);
}

/* Open state */
.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(2) {
  opacity: 0;
}
.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* ── Mobile Menu ─────────────────────────────────────────── */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: calc(var(--z-sticky) - 1);
  overflow-y: auto;
  padding-top: var(--header-height-sm);

  /* Animation */
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.mobile-menu.is-open {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu__inner {
  padding: var(--space-8) var(--space-6) var(--space-12);
}

.mobile-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-8);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-4) var(--space-2);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-heading);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border-subtle);
  transition: color var(--transition-fast);
}

.mobile-nav__link:hover { color: var(--color-primary); }

/* Services accordion in mobile */
.mobile-nav__toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-2);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-heading);
  background: none;
  border: none;
  border-bottom: 1px solid var(--color-border-subtle);
  cursor: pointer;
  text-align: left;
}

.mobile-nav__toggle-icon {
  transition: transform var(--transition-base);
}

.mobile-nav__item.is-open .mobile-nav__toggle-icon {
  transform: rotate(180deg);
}

.mobile-nav__sub {
  list-style: none;
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--transition-slow);
}

.mobile-nav__item.is-open .mobile-nav__sub {
  max-height: 400px;
}

.mobile-nav__sub-link {
  display: block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-left: 2px solid var(--color-border);
  margin-left: var(--space-2);
  margin-block: var(--space-1);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.mobile-nav__sub-link:hover {
  color: var(--color-secondary);
  border-color: var(--color-primary);
  background-color: var(--color-primary-xlight);
}

.mobile-menu__cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-menu__cta .btn {
  justify-content: center;
  width: 100%;
}