/* Header & navigation */
header {
  background: var(--nav-bg, #0c4466);
  color: #f9f9f9;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.25);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.85rem 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  object-fit: cover;
}

.brand-title {
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 1.15rem;
}

.brand-title h3 {
  color: #ffffff;
}

/* Hamburger menu button */
.hamburger {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  gap: 0.35rem;
}

.hamburger span {
  display: block;
  width: 28px;
  height: 3px;
  background: #f9f9f9;
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(10px, 10px);
}

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

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

.main-nav-container {
  display: flex;
}

nav .main-nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  padding: 0;
}

nav .main-nav > li {
  position: relative;
}

nav .main-nav > li > a {
  display: block;
  color: #f9f9f9;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-bottom: 2px solid transparent;
}

nav .main-nav > li > a:hover {
  border-bottom-color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.1);
}

nav .main-nav > li.active > a {
  border-bottom-color: #00ff0d;
}

/* Dropdown menus */
.dropdown {
  position: relative;
}

.dropdown > a::after {
  content: " ▼";
  font-size: 0.65rem;
  margin-left: 0.35rem;
}

.dropdown-menu {
  list-style: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--nav-dropdown-bg, var(--nav-bg, #0c4466));
  border-radius: 0.5rem;
  min-width: 200px;
  margin: 0.5rem 0 0;
  padding: 0.5rem 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
  z-index: 100;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li {
  margin: 0;
}

.dropdown-menu a {
  display: block;
  color: #f0f4f8;
  font-size: 0.9rem;
  padding: 0.65rem 1.15rem;
  border-left: 3px solid transparent;
  transition: background-color 0.15s, border-color 0.15s;
}

.dropdown-menu a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-left-color: #00ff0d;
  text-decoration: none;
}

/* Header responsive */
@media (max-width: 880px) {
  .nav-inner {
    flex-direction: row;
    align-items: center;
  }

  .hamburger {
    display: flex;
  }

  .main-nav-container {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--nav-bg, #0c4466);
    flex-direction: column;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    z-index: 99;
  }

  .main-nav-container.active {
    max-height: 100vh;
    overflow-y: auto;
  }

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

  nav .main-nav > li > a {
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  nav .main-nav > li.active > a {
    background: rgba(12, 68, 102, 0.5);
  }

  .dropdown-menu {
    position: static;
    opacity: 0;
    visibility: hidden;
    transform: scaleY(0);
    transform-origin: top;
    max-height: 0;
    overflow: hidden;
    background: var(--nav-dropdown-bg, var(--nav-bg, #0c4466));
    border-radius: 0;
    min-width: auto;
    margin: 0;
    padding: 0;
    box-shadow: none;
  }

  .dropdown > a::after {
    content: " ▶";
    transition: transform 0.2s;
  }

  .dropdown.active > a::after {
    content: " ▼";
    transform: rotate(0deg);
  }

  .dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: scaleY(1);
    max-height: 500px;
    padding: 0.25rem 0;
  }

  .dropdown-menu a {
    padding: 0.65rem 2.5rem;
    border-left: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }
}