/* ============================================================================
 * MOBILE MENU SYSTEM - Modern Toggle Design
 * ============================================================================ */

/* ==========================================================================
 * 1. CSS CUSTOM PROPERTIES FOR MOBILE MENU
 * ========================================================================== */
:root {
  --mobile-menu-bg: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  --mobile-menu-overlay: rgba(0, 0, 0, 0.95);
  --mobile-menu-text: #ffffff;
  --mobile-menu-accent: #10b981;
  --mobile-menu-accent-hover: #059669;
  --mobile-menu-border: rgba(255, 255, 255, 0.15);
  --mobile-menu-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  --mobile-transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --hamburger-size: 30px;
  --hamburger-line-height: 3px;
}

/* ==========================================================================
 * 2. MOBILE MENU CONTAINER
 * ========================================================================== */
.mobile-menu {
  display: none;
  position: relative;
  z-index: 11002;
}

/* ==========================================================================
 * 3. MODERN MOBILE MENU TOGGLE
 * ========================================================================== */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  cursor: pointer;
  padding: 10px;
  position: relative;
  z-index: 11003;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.25);
}

.mobile-menu-toggle:hover {
  background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.35);
  transform: translateY(-2px);
}

.mobile-menu-toggle:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

/* Modern hamburger lines */
.mobile-menu-toggle span {
  display: block;
  height: 2px;
  width: 20px;
  background: #ffffff;
  border-radius: 1px;
  margin: 3px 0;
  transition: all 0.2s ease;
  transform-origin: center;
  opacity: 0.9;
}

.mobile-menu-toggle:hover span {
  background: #ffffff;
  opacity: 1;
}

/* Hide toggle when menu is active */
.mobile-menu-toggle.active {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ==========================================================================
 * 4. MOBILE MENU OVERLAY AND SIDEBAR
 * ========================================================================== */

/* Backdrop Overlay */
.mobile-menu-items {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 11000;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

/* Mobile Menu Sidebar */
.mobile-menu-items::after {
  content: '';
  position: absolute;
  top: 0;
  right: -80%;
  width: 80%;
  height: 100%;
  background: var(--mobile-menu-bg);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
}

/* Texture Overlay on Sidebar */
.mobile-menu-items::before {
  content: '';
  position: absolute;
  top: 0;
  right: -80%;
  width: 80%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="0.5" fill="%23ffffff" opacity="0.03"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  z-index: 1;
}

/* Active State */
.mobile-menu-items.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-items.active::after {
  right: 0;
}

.mobile-menu-items.active::before {
  right: 0;
}

/* ==========================================================================
 * 5. MOBILE MENU NAVIGATION
 * ========================================================================== */
.mobile-menu-list {
  list-style: none;
  padding: 2rem 1.5rem;
  margin: 0;
  text-align: left;
  width: 80%;
  height: 100%;
  overflow-y: auto;
  position: absolute;
  top: 0;
  right: -80%;
  background: transparent;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  z-index: 2;
  padding-top: 4rem;
}

.mobile-menu-items.active .mobile-menu-list {
  right: 0;
}

.mobile-menu-list li {
  margin: 0 0 1rem 0;
  opacity: 0;
  transform: translateY(30px);
  animation: none;
}

.mobile-menu-items.active .mobile-menu-list li {
  animation: slideInUp 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

/* Staggered Animation Delays */
.mobile-menu-items.active .mobile-menu-list li:nth-child(1) { animation-delay: 0.1s; }
.mobile-menu-items.active .mobile-menu-list li:nth-child(2) { animation-delay: 0.2s; }
.mobile-menu-items.active .mobile-menu-list li:nth-child(3) { animation-delay: 0.3s; }
.mobile-menu-items.active .mobile-menu-list li:nth-child(4) { animation-delay: 0.4s; }
.mobile-menu-items.active .mobile-menu-list li:nth-child(5) { animation-delay: 0.5s; }
.mobile-menu-items.active .mobile-menu-list li:nth-child(6) { animation-delay: 0.6s; }

@keyframes slideInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
 * 6. MOBILE MENU LINKS
 * ========================================================================== */
.mobile-menu-list > li > a,
.mobile-menu-link {
  display: block;
  padding: 1rem 0;
  color: var(--mobile-menu-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 1.1rem;
  text-transform: none;
  letter-spacing: 0.5px;
  position: relative;
  transition: all 0.3s ease;
  font-family: 'Plus Jakarta Sans', sans-serif;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  line-height: 1.4;
}

.mobile-menu-list > li > a::before,
.mobile-menu-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--mobile-menu-accent), #3b82f6);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.mobile-menu-list > li > a:hover,
.mobile-menu-link:hover {
  color: var(--mobile-menu-accent);
  padding-left: 1rem;
}

.mobile-menu-list > li > a:hover::before,
.mobile-menu-link:hover::before {
  width: 100%;
}

/* ==========================================================================
 * 7. MOBILE DROPDOWN SYSTEM
 * ========================================================================== */
.mobile-dropdown {
  position: relative;
  width: 100%;
}

.mobile-dropdown-toggle {
  display: block;
  padding: 1rem 0;
  background: none;
  border: none;
  color: var(--mobile-menu-text);
  font-weight: 500;
  font-size: 1.1rem;
  text-transform: none;
  letter-spacing: 0.5px;
  cursor: pointer;
  position: relative;
  transition: all 0.3s ease;
  width: 100%;
  font-family: 'Plus Jakarta Sans', sans-serif;
  text-decoration: none;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  line-height: 1.4;
}

.mobile-dropdown-toggle::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--mobile-menu-accent), #3b82f6);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.mobile-dropdown-toggle:hover {
  color: var(--mobile-menu-accent);
  padding-left: 1rem;
}

.mobile-dropdown-toggle:hover::before {
  width: 100%;
}

.mobile-dropdown-icon,
.mobile-dropdown-toggle i {
  margin-left: 8px;
  font-size: 0.9rem;
  transition: transform 0.3s ease;
}

.mobile-dropdown.active .mobile-dropdown-icon,
.mobile-dropdown.active .mobile-dropdown-toggle i {
  transform: rotate(180deg);
}

/* ==========================================================================
 * 8. MOBILE DROPDOWN MENU
 * ========================================================================== */
.mobile-dropdown-menu {
  display: none;
  margin-top: 1rem;
  padding: 0 0.8rem;
  max-width: 90%;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

.mobile-dropdown.active .mobile-dropdown-menu {
  display: block;
  animation: fadeInScale 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes fadeInScale {
  from { 
    opacity: 0; 
    transform: scale(0.9) translateY(-10px);
  }
  to { 
    opacity: 1; 
    transform: scale(1) translateY(0);
  }
}

.mobile-dropdown-link {
  display: block;
  padding: 0.8rem 1.2rem;
  margin: 0.6rem 0;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-weight: 400;
  font-size: 0.95rem;
  text-transform: none;
  letter-spacing: 0.2px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  text-align: left;
  font-family: 'Plus Jakarta Sans', sans-serif;
  line-height: 1.5;
}

.mobile-dropdown-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(16, 185, 129, 0.2), transparent);
  transition: left 0.4s ease;
}

.mobile-dropdown-link:hover {
  color: var(--mobile-menu-text);
  border-color: rgba(16, 185, 129, 0.5);
  background: rgba(16, 185, 129, 0.15);
  transform: translateY(-2px);
  box-shadow: var(--mobile-menu-shadow);
}

.mobile-dropdown-link:hover::before {
  left: 100%;
}

/* ==========================================================================
 * 9. MOBILE COURSE AND RESOURCE ITEMS
 * ========================================================================== */
.mobile-course-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
}

.mobile-course-title,
.course-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.95);
  line-height: 1.4;
  letter-spacing: 0.1px;
  margin: 0;
  display: block;
}

.mobile-dropdown-link:hover .mobile-course-title,
.mobile-dropdown-link:hover .course-title {
  color: var(--mobile-menu-text);
}

.mobile-resource-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
}

.mobile-resource-title,
.resource-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.95);
  line-height: 1.4;
  letter-spacing: 0.1px;
  margin-bottom: 3px;
  display: block;
}

.mobile-resource-description,
.resource-description {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.5;
  font-weight: 300;
  margin: 0;
  display: block;
}

.mobile-dropdown-link:hover .mobile-resource-title,
.mobile-dropdown-link:hover .resource-title {
  color: var(--mobile-menu-text);
}

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

/* ==========================================================================
 * 10. MOBILE NESTED DROPDOWN
 * ========================================================================== */
.mobile-nested-dropdown {
  margin: 0.8rem 0;
}

.mobile-nested-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.7rem 1rem;
  margin: 0.5rem 0;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  border: 1px solid var(--mobile-menu-border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  cursor: pointer;
  text-align: left;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.mobile-nested-icon {
  font-size: 0.9rem;
  transition: transform 0.3s ease;
  color: rgba(255, 255, 255, 0.7);
}

.mobile-nested-dropdown.active .mobile-nested-icon {
  transform: rotate(180deg);
  color: var(--mobile-menu-accent);
}

.mobile-nested-menu {
  display: none;
  margin-top: 0.5rem;
  padding-left: 0.8rem;
}

.mobile-nested-dropdown.active .mobile-nested-menu {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.mobile-nested-link {
  display: block;
  padding: 0.7rem 1rem;
  margin: 0.4rem 0;
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  font-weight: 400;
  font-size: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  transition: all 0.3s ease;
  text-align: left;
  line-height: 1.4;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.mobile-nested-link:hover {
  color: var(--mobile-menu-text);
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.12);
  transform: translateX(8px);
}

/* ==========================================================================
 * 11. COMING SOON ITEMS
 * ========================================================================== */
.mobile-course-item.coming-soon {
  padding: 0.5rem 0.8rem;
  margin: 0.4rem 0;
  border: 1px solid rgba(220, 38, 38, 0.3);
  border-radius: 8px;
  background: rgba(220, 38, 38, 0.06);
  text-align: left;
  cursor: not-allowed;
  display: block;
}

.mobile-course-item.coming-soon .mobile-course-title,
.mobile-course-item.coming-soon .course-title {
  color: #ef4444;
  font-size: 0.85rem;
  margin-bottom: 4px;
  line-height: 1.3;
}

.mobile-coming-soon-tag,
.coming-soon-tag {
  display: inline-block;
  margin-top: 4px;
  padding: 0.15rem 0.6rem;
  background: rgba(220, 38, 38, 0.15);
  color: #ef4444;
  font-size: 0.65rem;
  font-weight: 600;
  border-radius: 8px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

/* ==========================================================================
 * 12. VIEW ALL BUTTONS
 * ========================================================================== */
.mobile-view-all {
  background: linear-gradient(135deg, var(--mobile-menu-accent) 0%, var(--mobile-menu-accent-hover) 100%);
  color: var(--mobile-menu-text);
  font-weight: 600;
  text-align: center;
  margin-top: 1rem;
  padding: 0.7rem 1.5rem;
  border-radius: 16px;
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.25);
  transition: all 0.3s ease;
}

.mobile-view-all::before {
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.mobile-view-all:hover {
  background: linear-gradient(135deg, var(--mobile-menu-accent-hover) 0%, #047857 100%);
  transform: translateY(-3px);
  box-shadow: 0 12px 35px rgba(16, 185, 129, 0.4);
}

.mobile-view-all i {
  margin-left: 6px;
  font-size: 0.8rem;
}

/* ==========================================================================
 * 13. CLOSE BUTTON
 * ========================================================================== */
.mobile-menu-close {
  position: absolute;
  top: 1.5rem;
  right: -80%;
  width: 45px;
  height: 45px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--mobile-menu-border);
  border-radius: 50%;
  color: var(--mobile-menu-text);
  font-size: 1.3rem;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 3;
  margin-right: 1.5rem;
}

.mobile-menu-items.active .mobile-menu-close {
  right: 0;
}

.mobile-menu-close:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #ef4444;
  transform: rotate(90deg) scale(1.1);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

/* ==========================================================================
 * 14. RESPONSIVE DESIGN FOR MOBILE MENU
 * ========================================================================== */
@media screen and (max-width: 992px) {
  .mobile-menu {
    display: block;
  }
}

@media screen and (max-width: 768px) {
  .mobile-menu-list > li > a,
  .mobile-menu-link,
  .mobile-dropdown-toggle {
    font-size: 1.05rem;
    padding: 0.9rem 0;
  }
  
  .mobile-dropdown-link {
    font-size: 0.9rem;
    padding: 0.7rem 1rem;
  }
  
  .mobile-menu-list {
    padding: 1.5rem 1.2rem;
    padding-top: 3.5rem;
  }
  
  .mobile-menu-close {
    top: 1.2rem;
    margin-right: 1.2rem;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
}

@media screen and (max-width: 576px) {
  .mobile-menu-list > li > a,
  .mobile-menu-link,
  .mobile-dropdown-toggle {
    font-size: 1rem;
    padding: 0.8rem 0;
  }
  
  .mobile-dropdown-link {
    padding: 0.7rem 1rem;
    margin: 0.5rem 0;
    font-size: 0.9rem;
  }
  
  .mobile-menu-list {
    padding: 1.2rem 1rem;
    padding-top: 3rem;
  }
  
  .mobile-menu-close {
    top: 1rem;
    margin-right: 1rem;
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }
  
  .mobile-menu-list li {
    margin: 0 0 0.8rem 0;
  }
}

/* ==========================================================================
 * 15. ACCESSIBILITY AND FOCUS STATES
 * ========================================================================== */
.mobile-menu-toggle:focus,
.mobile-dropdown-toggle:focus,
.mobile-dropdown-link:focus,
.mobile-nested-link:focus,
.mobile-menu-close:focus {
  outline: 2px solid var(--mobile-menu-accent);
  outline-offset: 2px;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .mobile-menu-toggle span,
  .mobile-menu-overlay,
  .mobile-menu-nav,
  .mobile-menu-list li,
  .mobile-dropdown-link,
  .mobile-nested-link {
    transition: none;
    animation: none;
  }
}