/* ==========================================================================
   IGIT Website - Navigation CSS
   ========================================================================== */

/* Header & Navigation
   ========================================================================== */
header {
  background-color: var(--background-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

header.scrolled {
  box-shadow: var(--shadow-md);
  background-color: rgba(255, 255, 255, 0.98);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-logo {
  height: 50px;
  width: auto;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  color: var(--text-dark);
  font-weight: 600;
  padding: 0.5rem 0;
  display: block;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--secondary-color);
}

/* Dropdown Menu
   ========================================================================== */
.nav-item.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
}

.dropdown-toggle::after {
  content: '▼';
  font-size: 0.7rem;
  transition: var(--transition);
}

.nav-item.dropdown:hover .dropdown-toggle::after {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--background-white);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-sm);
  min-width: 220px;
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition);
  margin-top: 0.5rem;
}

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

.dropdown-item {
  display: block;
  padding: 0.75rem 1.5rem;
  color: var(--text-dark);
  transition: var(--transition);
}

.dropdown-item:hover {
  background-color: var(--background-light);
  color: var(--secondary-color);
}

/* Mobile Menu Toggle
   ========================================================================== */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--primary-color);
  transition: var(--transition);
  border-radius: 3px;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

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

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

/* Hero Sections
   ========================================================================== */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: var(--text-light);
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(30, 66, 103, 0.8), rgba(62, 126, 184, 0.7));
}

.hero::after {
  content: '';
  position: absolute;
  inset: -10%;
  background:
    radial-gradient(circle at 15% 25%, rgba(255, 255, 255, 0.2), transparent 55%),
    radial-gradient(circle at 80% 20%, rgba(62, 126, 184, 0.25), transparent 50%),
    radial-gradient(circle at 60% 75%, rgba(30, 66, 103, 0.35), transparent 50%);
  mix-blend-mode: screen;
  filter: blur(18px);
  opacity: 0.5;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  padding: var(--spacing-md);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  margin-bottom: var(--spacing-lg);
  color: var(--text-light);
  font-weight: 300;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Page Hero (Internal Pages)
   ========================================================================== */
.page-hero {
  position: relative;
  padding: var(--spacing-xxl) 0 var(--spacing-xl);
  background-size: cover;
  background-position: center;
  color: var(--text-light);
  text-align: center;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(30, 66, 103, 0.85), rgba(62, 126, 184, 0.75));
}

.page-hero-content {
  position: relative;
  z-index: 1;
}

.page-hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--spacing-sm);
  color: var(--text-light);
}

/* Back to Top Button
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--secondary-color);
  color: var(--text-light);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-color);
  transform: translateY(-5px);
}

/* Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .navbar-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--background-white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: var(--transition);
    max-height: calc(100vh - 70px);
    overflow-y: auto;
  }

  .navbar-menu.active {
    transform: translateX(0);
  }

  .navbar-nav {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-link {
    padding: 1rem 0;
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background-color: var(--background-light);
    margin-top: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-item.dropdown.active .dropdown-menu {
    max-height: 500px;
    padding: var(--spacing-sm) 0;
  }

  .dropdown-item {
    padding: 0.75rem 1rem;
  }

  .hero {
    min-height: 400px;
    background-attachment: scroll;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .page-hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}