/* ===== HAMBURGER BUTTON ===== */
.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 2px solid var(--border-light);
  border-radius: var(--border-radius);
  cursor: pointer;
  padding: 6px;
  transition: var(--transition);
  flex-shrink: 0;
}

.hamburger-btn:hover {
  border-color: var(--accent-color);
  background-color: var(--background-light);
}

.hamburger-btn span {
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}

.hamburger-btn.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger-btn.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger-btn.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== MAIN NAVIGATION BAR ===== */
.main-nav {
  background-color: var(--primary-color);
  position: fixed;
  top: 81px;
  left: 0;
  right: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.main-nav .container {
  padding: 0 20px;
}

.main-nav-list {
  display: flex;
  align-items: stretch;
  justify-content: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 12px 14px;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  transition: var(--transition);
  height: 100%;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--white);
  background-color: rgba(255,255,255,0.08);
}

.nav-arrow {
  flex-shrink: 0;
  opacity: 0.7;
  transition: transform 0.2s ease;
}

/* Dropdown level 1 */
.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--white);
  min-width: 210px;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  list-style: none;
  padding: 6px 0;
  z-index: 2000;
}

.nav-item--dropdown:hover > .dropdown-menu,
.nav-item--dropdown:focus-within > .dropdown-menu {
  display: block;
}

.nav-item--dropdown:hover > .nav-link .nav-arrow,
.nav-item--dropdown:focus-within > .nav-link .nav-arrow {
  transform: rotate(180deg);
}

.dropdown-menu .nav-link {
  color: var(--text-dark);
  padding: 9px 16px;
  font-size: 0.87rem;
  height: auto;
}

.dropdown-menu .nav-link:hover,
.dropdown-menu .nav-link:focus {
  background-color: var(--background-light);
  color: var(--primary-color);
}

/* Submenu level 2 */
.nav-item--submenu {
  position: relative;
}

.submenu {
  display: none;
  position: absolute;
  top: 0;
  left: 100%;
  background-color: var(--white);
  min-width: 230px;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  box-shadow: 4px 8px 24px rgba(0,0,0,0.15);
  list-style: none;
  padding: 6px 0;
  z-index: 2001;
}

.nav-item--submenu:hover > .submenu,
.nav-item--submenu:focus-within > .submenu {
  display: block;
}

.nav-item--submenu:hover > .nav-link .nav-arrow {
  opacity: 1;
}

.submenu .nav-link {
  color: var(--text-dark);
  padding: 9px 16px;
  font-size: 0.87rem;
  height: auto;
}

.submenu .nav-link:hover,
.submenu .nav-link:focus {
  background-color: var(--background-light);
  color: var(--primary-color);
}

/* Active page highlight */
.nav-link.is-current {
  color: var(--white);
  background-color: rgba(255,255,255,0.12);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1100px) {
  .main-nav-list {
    gap: 0;
  }
  .nav-link {
    padding: 12px 10px;
    font-size: 0.83rem;
  }
}

@media (max-width: 768px) {
  /* Show hamburger, hide desktop nav */
  .hamburger-btn {
    display: flex;
  }

  .main-nav {
    top: 81px;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.35s ease, border-bottom-color 0.35s ease;
    border-bottom-width: 0;
  }

  .main-nav.is-open {
    max-height: 600px;
    border-bottom-width: 1px;
    overflow-y: auto;
  }

  .main-nav .container {
    padding: 0;
  }

  .main-nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-item {
    border-bottom: 1px solid rgba(255,255,255,0.07);
  }

  .nav-link {
    padding: 13px 20px;
    font-size: 0.95rem;
    justify-content: space-between;
  }

  /* Dropdowns become static accordion on mobile */
  .dropdown-menu,
  .submenu {
    display: none;
    position: static;
    box-shadow: none;
    border-radius: 0;
    background-color: rgba(0,0,0,0.18);
    padding: 0;
    min-width: 0;
    width: 100%;
  }

  .dropdown-menu.is-open,
  .submenu.is-open {
    display: block;
  }

  .dropdown-menu li,
  .submenu li {
    border-top: 1px solid rgba(255,255,255,0.06);
  }

  .dropdown-menu .nav-link,
  .submenu .nav-link {
    color: rgba(255,255,255,0.8);
    padding: 11px 28px;
    font-size: 0.9rem;
    background-color: transparent;
    height: auto;
    justify-content: flex-start;
  }

  .dropdown-menu .nav-link:hover,
  .submenu .nav-link:hover {
    background-color: rgba(255,255,255,0.07);
    color: var(--white);
  }

  .nav-item--submenu .submenu {
    padding-left: 12px;
  }

  /* Hero / article offsets on mobile (nav hidden, contact-bar 81px + 7px shadow) */
  .hero {
    padding-top: 103px;
  }

  .svc-hero {
    padding-top: 103px;
  }

  article.article-content {
    padding-top: 98px;
  }

  .flow-section {
    padding-top: 98px;
  }
}

@media (max-width: 640px) {
  /* contact-bar shrinks to ~52px + 8px shadow buffer */
  .main-nav {
    top: 60px;
  }

  .hero {
    padding-top: 76px;
  }

  .svc-hero {
    padding-top: 76px;
  }

  article.article-content {
    padding-top: 72px;
  }

  .flow-section {
    padding-top: 72px;
  }
}