/* =========================
   SIDEBAR VARIABLES
========================= */
:root {
  --sidebar-width: 250px;
  --sidebar-collapsed: 68px;
  --sidebar-bg: linear-gradient(180deg, #111827, #1f2933);
  --sidebar-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================
   SIDEBAR STRUCTURE
========================= */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--sidebar-bg);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width var(--sidebar-transition);
}

/* =========================
   SIDEBAR HEADER
========================= */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  min-height: 60px;
  flex-shrink: 0;
}

.sidebar-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--sidebar-transition);
}

.sidebar-toggle {
  background: none;
  border: none;
  color: #9ca3af;
  font-size: 1rem;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.sidebar-toggle:hover {
  color: #fff;
  background: rgba(79, 70, 229, 0.15);
}

/* =========================
   SIDEBAR MENU
========================= */
.sidebar-menu {
  list-style: none;
  padding: 12px 8px;
  margin: 0;
  overflow-y: auto;
  overflow-x: hidden;
  flex: 1;
}

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

.sidebar-menu::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

/* Sidebar Item */
.sidebar-item {
  position: relative;
  margin-bottom: 2px;
}

.sidebar-item > a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  color: #9ca3af;
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  border-radius: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-item > a:hover {
  color: #ffffff;
  background: rgba(79, 70, 229, 0.15);
}

.sidebar-item > a > i:first-child {
  min-width: 20px;
  text-align: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.sidebar-label {
  overflow: hidden;
  white-space: nowrap;
  transition: opacity var(--sidebar-transition), width var(--sidebar-transition);
}

/* Submenu arrow */
.submenu-arrow {
  margin-left: auto;
  font-size: 0.65rem;
  transition: transform 0.25s ease, opacity var(--sidebar-transition);
  flex-shrink: 0;
}

.sidebar-item.active > a .submenu-arrow {
  transform: rotate(180deg);
}

/* =========================
   SUBMENU (EXPANDED)
========================= */
.sidebar-submenu {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.sidebar-item.active > .sidebar-submenu {
  max-height: 500px;
}

.sidebar-submenu li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px 8px 44px;
  color: #8b95a5;
  text-decoration: none;
  font-size: 13px;
  border-radius: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-submenu li a:hover {
  color: #ffffff;
  background: rgba(79, 70, 229, 0.12);
}

.sidebar-submenu li a i {
  min-width: 16px;
  text-align: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

/* =========================
   COLLAPSED STATE
========================= */
.sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar.collapsed .sidebar-brand {
  opacity: 0;
  width: 0;
}

.sidebar.collapsed .sidebar-toggle i {
  transform: rotate(180deg);
}

.sidebar.collapsed .sidebar-label,
.sidebar.collapsed .submenu-arrow {
  opacity: 0;
  width: 0;
  overflow: hidden;
  padding: 0;
  margin: 0;
  flex: 0 0 0;
  display: none;
}

.sidebar.collapsed .sidebar-item > a {
  justify-content: center;
  padding: 10px;
  gap: 0;
}

.sidebar.collapsed .sidebar-item > a > i:first-child {
  min-width: 20px;
  width: 20px;
  text-align: center;
}

/* Hide inline submenus when collapsed */
.sidebar.collapsed .sidebar-submenu {
  max-height: 0 !important;
}

/* =========================
   TOOLTIP (COLLAPSED)
========================= */
.sidebar.collapsed .sidebar-item > a {
  position: relative;
}

.sidebar.collapsed .sidebar-item > a::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: #1f2937;
  color: #fff;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 10001;
}

.sidebar.collapsed .sidebar-item:not(.has-submenu) > a:hover::after {
  opacity: 1;
}

/* =========================
   FLYOUT SUBMENU (COLLAPSED)
========================= */
.sidebar.collapsed .has-submenu .sidebar-submenu {
  position: fixed;
  left: var(--sidebar-collapsed);
  min-width: 220px;
  background: #1f2937;
  border-radius: 10px;
  padding: 8px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: translateX(-8px);
  max-height: none !important;
  overflow: visible;
  z-index: 10000;
}

.sidebar.collapsed .has-submenu:hover .sidebar-submenu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

/* Flyout header */
.sidebar.collapsed .has-submenu .sidebar-submenu::before {
  content: attr(data-submenu-title);
  display: block;
  padding: 8px 12px 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 4px;
}

.sidebar.collapsed .sidebar-submenu li a {
  padding: 8px 12px;
}

/* =========================
   MOBILE HAMBURGER
========================= */
.mobile-menu-btn {
  display: none;
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 10001;
  background: #1f2937;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #9ca3af;
  font-size: 1.2rem;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.mobile-menu-btn:hover {
  color: #fff;
  background: rgba(79, 70, 229, 0.2);
}

/* =========================
   OVERLAY (MOBILE)
========================= */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 9998;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
  display: block;
  opacity: 1;
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width) !important;
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar.mobile-open .sidebar-brand {
    opacity: 1 !important;
    width: auto !important;
  }

  .sidebar.mobile-open .sidebar-label,
  .sidebar.mobile-open .submenu-arrow {
    opacity: 1 !important;
    width: auto !important;
  }

  .mobile-menu-btn {
    display: flex;
  }

  /* Reset collapsed overrides on mobile when open */
  .sidebar.mobile-open .sidebar-item > a {
    justify-content: flex-start;
    padding: 10px 12px;
  }

  .sidebar.mobile-open .sidebar-submenu {
    position: static !important;
    min-width: unset !important;
    background: transparent !important;
    border-radius: 0 !important;
    padding: 0 !important;
    box-shadow: none !important;
    opacity: 1 !important;
    pointer-events: auto !important;
    transform: none !important;
  }

  .sidebar.mobile-open .sidebar-submenu li a {
    padding: 8px 12px 8px 44px;
  }
}