:root {
  --bs-primary: #2F6FEB;
  --bs-primary-rgb: 47, 111, 235;
  
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 70px;
  --navbar-height: 64px;
}

/* Base Posture */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui, sans-serif;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', system-ui, sans-serif;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* Sidebar */
#sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1040;
  background-color: var(--bs-body-bg);
  border-right: 1px solid var(--bs-border-color);
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-x: hidden;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

#sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar-logo {
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--bs-border-color);
  white-space: nowrap;
  flex-shrink: 0;
  overflow: hidden;
}

#sidebar.collapsed .sidebar-logo span {
  display: none;
}

.sidebar-content {
  flex-grow: 1;
  padding: 1rem 0;
}

.nav-link {
  color: var(--bs-body-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
  border-left: 3px solid transparent;
  transition: all 0.2s;
  text-decoration: none;
}

.nav-link:hover {
  background-color: rgba(var(--bs-primary-rgb), 0.05);
  color: var(--bs-primary);
}

.nav-link.active {
  background-color: rgba(var(--bs-primary-rgb), 0.08);
  color: var(--bs-primary);
  border-left-color: var(--bs-primary);
}

.nav-link i {
  font-size: 1.25rem;
  min-width: 24px;
  text-align: center;
}

#sidebar.collapsed .nav-link span,
#sidebar.collapsed .nav-group-toggle::after {
  display: none;
}

/* Submenus */
.nav-group-items {
  list-style: none;
  padding: 0;
  margin: 0;
  background-color: var(--bs-secondary-bg);
  display: none;
}

.nav-group.open .nav-group-items {
  display: block;
}

.nav-group-toggle::after {
  content: '\F282'; /* bi-chevron-right */
  font-family: 'bootstrap-icons';
  margin-left: auto;
  font-size: 0.8rem;
  transition: transform 0.2s;
}

.nav-group.open .nav-group-toggle::after {
  transform: rotate(90deg);
}

.nav-group-items .nav-link {
  padding-left: 3.5rem;
  font-size: 0.9rem;
}

#sidebar.collapsed .nav-group-items {
  display: none !important;
}

/* Main Wrapper */
#main-wrapper {
  margin-left: var(--sidebar-width);
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

#main-wrapper.expanded {
  margin-left: var(--sidebar-collapsed-width);
}

/* Top Navbar */
.top-navbar {
  height: var(--navbar-height);
  background-color: var(--bs-body-bg);
  border-bottom: 1px solid var(--bs-border-color);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1030;
}

.content-body {
  padding: 2rem;
  flex-grow: 1;
}

/* Cards & Components */
.card {
  border-radius: 12px;
  border-color: var(--bs-border-color);
}

/* Table styling */
.table thead th {
  background-color: var(--bs-tertiary-bg);
  color: var(--bs-secondary-color);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-top: none;
}

.sortable th {
  cursor: pointer;
}

.sortable th::after {
  content: '\F229';
  font-family: 'bootstrap-icons';
  margin-left: 0.5rem;
  opacity: 0.3;
}

.theme-toggle {
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: background-color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background-color: var(--bs-secondary-bg);
}

/* Utilities */
.extra-small {
  font-size: 0.7rem;
}

.bg-surface {
  background-color: var(--bs-body-bg);
}

@media (max-width: 991.98px) {
  #sidebar {
    transform: translateX(-100%);
  }
  #sidebar.show {
    transform: translateX(0);
  }
  #main-wrapper {
    margin-left: 0 !important;
  }
}