:root {
  --sidebar-w: 240px;
  --blue: #2563a8;
  --blue-light: #e8f0fb;
  --white: #fff;
  --gray-50: #f8f9fb;
  --gray-100: #f0f2f5;
  --gray-200: #e2e6ed;
  --gray-400: #9aa3af;
  --gray-600: #5a6472;
  --gray-800: #1e2530;
  --error: #dc2626;
}

.app-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  max-height: 100vh;
  background: var(--white);
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
}

.app-sidebar .sidebar-logo.brand-logo {
  flex-shrink: 0;
}

.app-sidebar .sidebar-nav {
  flex: 1;
  min-height: 0;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}

.app-sidebar .nav-pinned {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 10px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--gray-100);
}

.app-sidebar .sidebar-mandant-nav {
  flex-shrink: 0;
  padding: 12px;
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

.app-sidebar .sidebar-footer {
  flex-shrink: 0;
  padding: 16px 12px;
  border-top: 1px solid var(--gray-100);
}

.app-sidebar .nav-section {
  font-size: 10px;
  font-weight: 600;
  color: var(--gray-400);
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 12px 8px 6px;
}

/* Accordion groups */
.app-sidebar .nav-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.app-sidebar .nav-group-toggle {
  appearance: none;
  border: 0;
  background: transparent;
  width: 100%;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 8px 6px;
  border-radius: 8px;
  color: var(--gray-400);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.app-sidebar .nav-group-toggle:hover {
  background: var(--gray-50);
  color: var(--gray-600);
}

.app-sidebar .nav-group-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-sidebar .nav-group-chevron {
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  transition: transform 0.18s ease;
}

.app-sidebar .nav-group-toggle[aria-expanded='true'] .nav-group-chevron {
  transform: rotate(90deg);
}

.app-sidebar .nav-group-items {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 6px;
}

.app-sidebar .nav-group-items.open {
  display: flex;
}

.app-sidebar .nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.app-sidebar .nav-item:hover {
  background: var(--gray-50);
  color: var(--gray-800);
}

.app-sidebar .nav-item.active {
  background: var(--blue-light);
  color: var(--blue);
}

.app-sidebar .nav-item svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  display: block;
}

.app-sidebar .user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  min-width: 0;
}

.app-sidebar .user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--blue-light);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 13px;
  flex-shrink: 0;
}

.app-sidebar .user-info > div:not(.user-avatar):not(.logout-btn) {
  min-width: 0;
  overflow: hidden;
}

.app-sidebar .user-name,
.app-sidebar .user-role {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-sidebar .user-name {
  font-size: 13px;
  font-weight: 500;
}

.app-sidebar .user-role {
  font-size: 11px;
  color: var(--gray-400);
}

.app-sidebar .logout-btn {
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  cursor: pointer;
  border-radius: 6px;
}

.app-sidebar .logout-btn:hover {
  color: var(--error);
}

.app-sidebar .logout-btn svg {
  width: 16px;
  height: 16px;
  display: block;
}

body.app-sidebar-ready .main {
  margin-left: var(--sidebar-w);
}

/* Kein Flash des ungefilterten HTML-Baums */
html[data-kvdt-auth="ok"] body:not(.app-sidebar-ready) aside.sidebar,
html[data-kvdt-auth="ok"] body:not(.app-sidebar-ready) #app-sidebar {
  visibility: hidden;
}