/* ================================================================
 * MODERN SIDEBAR DESIGN
 * Professional UI/UX with collapsible sections
 * Background: #1b4f79 | Text: white
 * ================================================================ */

/* Sidebar Base */
.side-navbar {
  position: fixed;
  top: 70px;
  left: 0;
  bottom: 0;
  width: 250px;
  z-index: 90;
  background: linear-gradient(250deg, #1B4F79, #4A6A7F, #575858);;
  box-shadow: 2px 0 20px rgba(0, 0, 0, 0.12);
  transition: transform 0.3s ease, width 0.3s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: calc(100vh - 70px);
}

/* User Profile */
.sidebar-profile {
  padding: 18px 20px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-profile .profile-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.25);
  flex-shrink: 0;
}

.sidebar-profile .profile-info {
  min-width: 0;
  flex: 1;
}

.sidebar-profile .profile-name {
  display: block;
  color: #ffffff;
  font-size: 0.938rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-profile .profile-role {
  display: block;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.85rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Search */
.sidebar-search {
  padding: 12px 16px;
  border-bottom: 1px solid #fff;
  flex-shrink: 0;
}

.sidebar-search .search-wrapper {
  position: relative;
}

.sidebar-search .search-wrapper input {
  width: 100%;
  padding: 9px 12px 9px 38px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid #fff;
  border-radius: 8px;
  color: #ffffff;
  font-size: 0.813rem;
  transition: all 0.2s ease;
  outline: none;
}

.sidebar-search .search-wrapper input::placeholder {
  color: #fff;
}

.sidebar-search .search-wrapper input:focus {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.sidebar-search .search-wrapper .search-icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: #fff;
  font-size: 1rem;
}

/* Navigation Container */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 6px 0 16px;
}

.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

.sidebar-nav::-webkit-scrollbar-track {
  background: transparent;
}

/* Dashboard Link (standalone) */
.sidebar-dashboard-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 15px;
  color: #fff;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
  margin: 2px 0;
}

.sidebar-dashboard-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.sidebar-dashboard-link.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  border-left-color: #ffffff;
}

.sidebar-dashboard-link i {
  font-size: 1.15rem;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

/* Section Header (collapsible) */
.sidebar-section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 11px 20px;
  background: none;
  border: none;
  border-left: 3px solid transparent;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 8px;
  user-select: none;
  text-align: start;
}

.sidebar-section-header:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}

.sidebar-section-header i {
  font-size: 0.85rem;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-section-header .collapse-icon {
  margin-left: auto;
  font-size: 1.05rem;
  transition: transform 0.25s ease;
  opacity: 0.5;
}

.sidebar-section-header[aria-expanded="true"] .collapse-icon {
  transform: rotate(180deg);
}

/* Section Items List */
.sidebar-items {
  list-style: none;
  padding: 0;
  margin: 2px 0 4px;
}

.sidebar-items li {
  margin: 1px 0;
}

.sidebar-items li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 20px 9px 40px;
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
  border-radius: 0;
  position: relative;
}

.sidebar-items li a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.sidebar-items li a.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  border-left-color: #ffffff;
}

.sidebar-items li a i {
  font-size: 0.875rem;
  width: 16px;
  text-align: center;
  flex-shrink: 0;
  opacity: 0.65;
}

.sidebar-items li a:hover i,
.sidebar-items li a.active i {
  opacity: 1;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 12px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}

.sidebar-footer a,
.sidebar-footer button {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 8px 0;
  transition: color 0.2s ease;
}

.sidebar-footer a:hover,
.sidebar-footer button:hover {
  color: #fca5a5 !important;
}

.sidebar-footer a i,
.sidebar-footer button i {
  font-size: 1rem;
}

/* Main Content Adjustment */
.main-content {
  margin-top: 70px;
  transition: margin-left 0.3s ease;
}

/* ================================================================
 * CONDENSED SIDEBAR (left-side-menu-condensed)
 * ================================================================ */
.left-side-menu-condensed .side-navbar {
  width: 68px;
  height: calc(100vh - 70px);
}

.left-side-menu-condensed .side-navbar .sidebar-profile .profile-info,
.left-side-menu-condensed .side-navbar .sidebar-search,
.left-side-menu-condensed .side-navbar .sidebar-section-header span,
.left-side-menu-condensed .side-navbar .sidebar-section-header .collapse-icon,
.left-side-menu-condensed .side-navbar .sidebar-items,
.left-side-menu-condensed .side-navbar .sidebar-footer span,
.left-side-menu-condensed .side-navbar .sidebar-dashboard-link span {
  display: none !important;
}

.left-side-menu-condensed .side-navbar .sidebar-section-header {
  padding: 14px 0;
  justify-content: center;
  border-left: none;
  margin-top: 2px;
  min-height: 44px;
  cursor: default;
}

.left-side-menu-condensed .side-navbar .sidebar-section-header:hover {
  background: transparent;
}

.left-side-menu-condensed .side-navbar .sidebar-section-header i {
  margin: 0;
  font-size: 1.25rem;
  opacity: 0.8;
}

.left-side-menu-condensed .side-navbar .sidebar-dashboard-link {
  padding: 14px 0;
  justify-content: center;
  border-left: none;
  min-height: 44px;
}

.left-side-menu-condensed .side-navbar .sidebar-dashboard-link i {
  font-size: 1.25rem;
  margin: 0;
}

.left-side-menu-condensed .side-navbar .sidebar-profile {
  padding: 14px 0;
  justify-content: center;
}

.left-side-menu-condensed .side-navbar .sidebar-footer {
  display: flex;
  justify-content: center;
  padding: 10px 0;
}

.left-side-menu-condensed .side-navbar .sidebar-footer button,
.left-side-menu-condensed .side-navbar .sidebar-footer a {
  justify-content: center;
  padding: 8px 0;
  width: auto;
}

.left-side-menu-condensed .side-navbar .sidebar-footer button i,
.left-side-menu-condensed .side-navbar .sidebar-footer a i {
  font-size: 1.2rem;
  margin: 0;
}

.left-side-menu-condensed .main-content {
  margin-left: 68px;
}

.left-side-menu-condensed .side-navbar.expanded-in-condensed { width: 260px; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-search,
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-items,
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-profile .profile-info { display: block !important; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-section-header span,
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-section-header .collapse-icon,
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-dashboard-link span,
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-footer span { display: inline !important; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-section-header { padding: 11px 20px; justify-content: flex-start; min-height: auto; cursor: pointer; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-section-header:hover { background: rgba(255, 255, 255, 0.06); }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-section-header i { margin: 0; font-size: 0.95rem; opacity: 0.7; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-dashboard-link { padding: 11px 20px; justify-content: flex-start; min-height: auto; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-dashboard-link i { font-size: 1.15rem; margin: 0; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-profile { padding: 18px 20px 14px; justify-content: flex-start; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-footer { display: flex; justify-content: flex-start; padding: 12px 20px; }
.left-side-menu-condensed .side-navbar.expanded-in-condensed ~ .main-content,
.left-side-menu-condensed .side-navbar.expanded-in-condensed ~ .footer { margin-left: 260px; }

/* ================================================================
 * MOBILE OVERLAY
 * ================================================================ */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 89;
  cursor: pointer;
}

body.show-sidebar .sidebar-overlay {
  display: block;
}

/* ================================================================
 * RESPONSIVE - screens <= 1024px
 * ================================================================ */
@media (max-width: 1024px) {
  .side-navbar {
    transform: translateX(-100%);
  }

  body.show-sidebar .side-navbar {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0 !important;
  }

  /* Show hamburger icon in admin header */
  .topbar-header .left-bar .hamburg-icon {
    display: inline-flex !important;
  }

  #vertical-menu-btn {
    display: inline-flex !important;
  }

  .navbar-brand-box {
    width: auto !important;
    text-align: center;
    padding: 0 5px;
  }

  /* hide student/professor navbar-toggle on large screens, show on small */
  .navbar-toggle {
    display: flex !important;
    flex-direction: column;
    padding-left: 15px;
    cursor: pointer;
    border: none;
    background: none;
  }

  .navbar-toggle span {
    width: 24px;
    margin-bottom: 6px;
    height: 2px;
    background: #fff;
    display: block;
    transform-origin: 4px 0px;
    transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1), background 0.5s cubic-bezier(0.77, 0.2, 0.05, 1), opacity 0.55s ease;
  }

  .navbar-toggle span:last-child {
    margin-bottom: 0;
  }

  .navbar-toggle:not(.collapsed) span:first-child {
    transform: rotate(45deg) translate(4px, 0);
  }

  .navbar-toggle:not(.collapsed) span:nth-last-child(2) {
    transform: rotate(-45deg) translate(-3px, 5px);
  }

  .navbar-toggle:not(.collapsed) span:last-child {
    opacity: 0;
  }
}

/* ================================================================
 * SMOOTH COLLAPSE TRANSITION
 * ================================================================ */
.collapse:not(.show) {
  display: none;
}

.collapsing {
  height: 0;
  overflow: hidden;
  transition: height 0.25s ease;
}

/* Sub-sub menu indentation */
.sidebar-items .sidebar-items li a {
  padding-left: 70px;
}

@media (max-width: 1023px) {
    .hide-below-1024 {
        display: none !important;
    }
}

.show-below-1024 {
    display: none;
}

@media (max-width: 1023px) {
    .show-below-1024 {
        display: block !important;
    }
}

.sidebar-item-has-children {
    width: 100%;
}

.sidebar-sub-header {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 9px 20px 9px 40px;
    background: none;
    border: none;
    border-left: 3px solid transparent;
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.sidebar-sub-header:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
}

.sidebar-sub-header i:first-child {
    font-size: 0.875rem;
    width: 16px;
    text-align: center;
    flex-shrink: 0;
    opacity: 0.65;
}

.sidebar-sub-header:hover i {
    opacity: 1;
}

.sidebar-sub-header .collapse-icon {
    margin-left: auto;
    font-size: 1.05rem;
    transition: transform 0.25s ease;
    opacity: 0.5;
    flex-shrink: 0;
}

.sidebar-sub-header[aria-expanded="true"] .collapse-icon {
    transform: rotate(180deg);
}

/* ── Third-level link list ── */
.sidebar-sub-items {
    list-style: none;
    padding: 0;
    margin: 1px 0 2px;
}

.sidebar-sub-items li a {
    display: flex;
    align-items: center;
    padding: 8px 20px 8px 64px;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 400;
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
    position: relative;
}

.sidebar-sub-items li a::before {
    content: '–';
    position: absolute;
    left: 48px;
    opacity: 0.4;
    font-size: 0.75rem;
}

.sidebar-sub-items li a:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.06);
    text-decoration: none;
}

.sidebar-sub-items li a.active {
    color: #ffffff;
    border-left-color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
}

/* Condensed mode: hide sub-headers text & chevron */
.left-side-menu-condensed .side-navbar .sidebar-sub-header span,
.left-side-menu-condensed .side-navbar .sidebar-sub-header .collapse-icon {
    display: none !important;
}

.left-side-menu-condensed .side-navbar .sidebar-sub-header {
    padding: 14px 0;
    justify-content: center;
    border-left: none;
}

.left-side-menu-condensed .side-navbar .sidebar-sub-header i:first-child {
    font-size: 1.25rem;
    margin: 0;
}

/* Restore in expanded-condensed mode */
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-sub-header span,
.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-sub-header .collapse-icon {
    display: inline !important;
}

.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-sub-header {
    padding: 9px 20px 9px 40px;
    justify-content: flex-start;
    border-left: 3px solid transparent;
}

.left-side-menu-condensed .side-navbar.expanded-in-condensed .sidebar-sub-header i:first-child {
    font-size: 0.875rem;
    margin: 0;
}