/* ============================================================================
 * NAVIGATION SYSTEM - Clean & Organized
 * ============================================================================ */

/* ==========================================================================
 * 1. CSS CUSTOM PROPERTIES FOR NAVIGATION
 * ========================================================================== */
:root {
  --navbar-height: 70px;
  --navbar-bg-transparent: transparent;
  --navbar-bg-scrolled: rgba(15, 23, 42, 0.85);
  --navbar-text-color: #ffffff;
  --navbar-border-color: rgba(255, 255, 255, 0.1);
  --dropdown-bg: rgba(15, 23, 42, 0.95);
  --dropdown-text: #ffffff;
  --primary-blue: #4f81ff;
  --transition-smooth: all 0.3s ease;
}

/* ==========================================================================
 * 2. BASE NAVBAR STRUCTURE
 * ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 11000;
  background: transparent;
  color: #ffffff;
  padding: 1rem 0;
  transition: all 0.3s ease;
}

.navbar-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  padding: 0 2rem;
  max-width: 1280px;
  margin: 0 auto;
}

/* ==========================================================================
 * 3. NAVBAR LOGO
 * ========================================================================== */
.navbar img {
  width: 165px;
  height: auto;
  transition: all 0.3s ease;
  filter: brightness(1);
  padding: 4px 8px;
  border-radius: 8px;
  background: transparent;
  border: 1px solid transparent;
}

/* ==========================================================================
 * 4. SCROLLED NAVBAR STATE
 * ========================================================================== */
.navbar.scrolled {
  background: var(--navbar-bg-scrolled);
  /*backdrop-filter: blur(12px);*/
  -webkit-backdrop-filter: blur(12px);
  padding: 0.5rem 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(15, 23, 42, 0.85);
}

.navbar.scrolled img {
  width: 155px;
  filter: brightness(1.3) drop-shadow(0 2px 8px rgba(255, 255, 255, 0.4));
  background: rgba(255, 255, 255, 0.08);
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  /*backdrop-filter: blur(8px);*/
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 
    0 4px 15px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
 * 5. DESKTOP MAIN MENU
 * ========================================================================== */
.main-menu-items {
  display: flex;
  align-items: center;
}

.main-menu-list {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Desktop Menu Links */
.main-menu-list li a {
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

.main-menu-list li a:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Scrolled State Menu Links */
.navbar.scrolled .main-menu-list li a {
  background: rgba(255, 255, 255, 0.08);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.navbar.scrolled .main-menu-list li a:hover {
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

/* ==========================================================================
 * 6. DROPDOWN SYSTEM
 * ========================================================================== */
.has-dropdown {
  position: relative;
}

.dropdown-icon {
  font-size: 0.875rem;
  margin-left: 0.5rem;
  transition: all 0.3s ease;
  color: rgba(255, 255, 255, 0.8);
}

.has-dropdown:hover .dropdown-icon {
  transform: rotate(180deg);
  color: #4f81ff;
}

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  min-width: 350px;
  max-width: 450px;
  background: linear-gradient(135deg, 
    rgba(15, 23, 42, 0.95) 0%, 
    rgba(6, 78, 59, 0.92) 100%);
  /*backdrop-filter: blur(12px);*/
  -webkit-backdrop-filter: blur(12px);
  border-radius: 12px;
  border: 1px solid rgba(16, 185, 129, 0.3);
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.4),
    0 8px 20px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(16, 185, 129, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-10px);
  transition: all 0.3s ease;
  z-index: 1000;
  padding: 16px;
}

.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* Dropdown Content */
.dropdown-content {
  padding: 0;
}

.dropdown-content h4 {
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  margin: 0 0 12px 0;
  padding: 0 4px 8px;
  border-bottom: 2px solid rgba(16, 185, 129, 0.4);
}

.dropdown-link {
  display: block;
  padding: 12px 16px;
  margin: 4px 0;
  border-radius: 8px;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: all 0.2s ease;
}

.dropdown-link:hover {
  background: #4f81ff;
  border-color: #4f81ff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 129, 255, 0.3);
}

.course-item {
  display: block;
}

.course-title {
  font-size: 14px;
  font-weight: 500;
  color: #ffffff;
  line-height: 1.4;
}

.dropdown-link:hover .course-title {
  color: #ffffff;
}

/* View All Courses Button */
.view-all-courses {
  display: block;
  margin-top: 12px;
  padding: 12px 16px;
  background: linear-gradient(135deg, var(--primary-blue) 0%, #3b73d4 100%);
  color: #ffffff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  text-align: center;
  transition: all 0.2s ease;
}

.view-all-courses:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 129, 255, 0.4);
}

/* ==========================================================================
 * 7. NESTED DROPDOWN SYSTEM
 * ========================================================================== */
.has-nested-dropdown {
  position: relative;
}

.nested-dropdown-icon {
  font-size: 0.75rem;
  margin-left: auto;
  transition: all 0.25s ease;
  color: rgba(255, 255, 255, 0.7);
  transform: rotate(-90deg);
}

.nested-dropdown-menu {
  position: absolute;
  top: 0;
  left: calc(100% + 12px);
  min-width: 350px;
  background: linear-gradient(135deg, 
    rgba(15, 23, 42, 0.95) 0%, 
    rgba(6, 78, 59, 0.92) 100%);
  /*backdrop-filter: blur(12px);*/
  -webkit-backdrop-filter: blur(12px);
  border-radius: 12px;
  border: 1px solid rgba(16, 185, 129, 0.3);
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.4),
    0 8px 20px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(16, 185, 129, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-12px);
  transition: all 0.25s ease;
  z-index: 1001;
  padding: 8px;
}

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

.has-nested-dropdown:hover > .dropdown-link {
  background: #4f81ff;
  border-color: #4f81ff;
  color: #ffffff;
}

.has-nested-dropdown:hover > .dropdown-link .course-title {
  color: #ffffff;
}

.has-nested-dropdown:hover .nested-dropdown-icon {
  transform: rotate(0deg);
  color: #ffffff;
}

/* Nested Dropdown Links */
.nested-dropdown-menu .dropdown-link,
.nested-dropdown-menu .course-item,
.nested-dropdown-menu .nested-dropdown-link {
  display: block;
  margin: 6px 0;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.3s ease;
  position: relative;
}

.nested-dropdown-menu .dropdown-link:hover,
.nested-dropdown-menu .nested-dropdown-link:hover {
  background: #4f81ff;
  border-color: #4f81ff;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(79, 129, 255, 0.4);
}

.nested-dropdown-menu .course-title {
  font-size: 14px;
  color: #ffffff;
  line-height: 1.5;
  font-weight: 500;
  margin: 0;
  display: block;
  padding-right: 0;
}

.nested-dropdown-menu .dropdown-link:hover .course-title,
.nested-dropdown-menu .nested-dropdown-link:hover .course-title {
  color: #ffffff;
}

/* Coming Soon Items */
.nested-dropdown-menu .course-item.coming-soon {
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid rgba(220, 38, 38, 0.3);
  cursor: not-allowed;
  opacity: 0.8;
}

.nested-dropdown-menu .course-item.coming-soon:hover {
  background: rgba(220, 38, 38, 0.15);
  border-color: rgba(220, 38, 38, 0.4);
  transform: none;
  box-shadow: none;
}

.nested-dropdown-menu .course-item.coming-soon .course-title {
  color: #ef4444;
}

.nested-dropdown-menu .coming-soon-tag {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  background: rgba(220, 38, 38, 0.2);
  color: #ef4444;
  font-size: 11px;
  font-weight: 600;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ==========================================================================
 * 8. RESOURCES DROPDOWN SYSTEM
 * ========================================================================== */

/* Resources Section */
.dropdown-section {
  margin-bottom: 16px;
}

/* Resource Items */
.resource-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.resource-title {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  line-height: 1.3;
}

.resource-description {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.4;
  margin: 0;
}

/* Resource Link Hover */
.dropdown-link:hover .resource-title {
  color: #ffffff;
}

.dropdown-link:hover .resource-description {
  color: rgba(255, 255, 255, 0.9);
}

/* Dropdown Footer */
.dropdown-footer {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(16, 185, 129, 0.3);
}

.view-all-resources {
  display: block;
  padding: 12px 16px;
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  text-align: center;
  transition: all 0.2s ease;
  border: none;
}

.view-all-resources:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.view-all-resources i {
  margin-left: 8px;
  font-size: 0.9rem;
}

/* ==========================================================================
 * 9. RESPONSIVE DESIGN
 * ========================================================================== */

/* Nested dropdown responsive positioning */
@media screen and (max-width: 1200px) {
  .nested-dropdown-menu {
    left: calc(-100% - 12px);
    transform: translateX(12px);
  }
  
  .has-nested-dropdown:hover .nested-dropdown-menu {
    transform: translateX(0);
  }
}

@media screen and (max-width: 992px) {
  .main-menu-items {
    display: none;
  }
  
  .navbar-flex {
    padding: 0 1.5rem;
  }
}

@media screen and (max-width: 768px) {
  .navbar.scrolled img {
    width: 140px;
  }
  
  .navbar-flex {
    padding: 0 1rem;
  }
}

@media screen and (max-width: 576px) {
  .navbar.scrolled img {
    width: 125px;
  }
  
  .navbar-flex {
    padding: 0 0.75rem;
    height: 60px;
  }
}