.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-panel);
  border-right: 1px solid var(--color-border);
  z-index: 100;
  transition: width 0.2s ease;
  overflow: hidden;
}

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

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
  min-height: 56px;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text-primary);
  text-decoration: none;
}

.sidebar-brand .brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

.sidebar.collapsed .sidebar-brand span {
  display: none;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  transition: color 0.15s, background 0.15s;
}

.sidebar-toggle:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

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

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.sidebar-section {
  margin-bottom: 0.5rem;
}

.sidebar-section-title {
  padding: 0.5rem 0.75rem 0.25rem;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.sidebar.collapsed .sidebar-section-title span {
  display: none;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}

.sidebar-link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

.sidebar-link.active {
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.sidebar-link svg {
  flex-shrink: 0;
}

.sidebar.collapsed .sidebar-link span {
  display: none;
}

.sidebar.collapsed .sidebar-link {
  justify-content: center;
  padding: 0.5rem;
}

.sidebar-footer {
  border-top: 1px solid var(--color-border);
  padding: 0.75rem;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.sidebar-user-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-user-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-role {
  font-size: 0.7rem;
  color: var(--color-text-muted);
}

.sidebar.collapsed .sidebar-user-info {
  display: none;
}

.sidebar-footer-actions {
  display: flex;
  gap: 0.25rem;
}

.sidebar.collapsed .sidebar-footer-actions {
  flex-direction: column;
  align-items: center;
}

.sidebar-icon-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, background 0.15s;
}

.sidebar-icon-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  transition: margin-left 0.2s ease;
}

.main-content.sidebar-collapsed {
  margin-left: var(--sidebar-collapsed-width);
}

/* Mobile sidebar */
.sidebar-backdrop {
  display: none;
}

.sidebar-mobile-toggle {
  display: none;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width);
    box-shadow: var(--color-shadow-lg) 4px 0 20px;
  }

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

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

  .sidebar.collapsed .sidebar-link span,
  .sidebar.collapsed .sidebar-brand span,
  .sidebar.collapsed .sidebar-section-title span,
  .sidebar.collapsed .sidebar-user-info {
    display: initial;
  }

  .sidebar.collapsed .sidebar-link {
    justify-content: flex-start;
    padding: 0.5rem 0.75rem;
  }

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

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
  }

  .sidebar-backdrop.visible {
    display: block;
  }

  .sidebar-mobile-toggle {
    display: flex;
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 98;
    background: var(--color-bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    color: var(--color-text-primary);
    cursor: pointer;
    box-shadow: 0 2px 8px var(--color-shadow);
  }
}