#app-sidebar {
  display: block;
  width: 260px;
  min-width: 260px;
  background-color: var(--bg-card);
  border-right: 1px solid var(--border-color);
  padding: 1.25rem 1rem;
  flex-shrink: 0;
}

#app-sidebar.hidden {
  display: none !important;
}

.module-switcher {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.module-switcher label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.nav-section-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  display: block;
}

.sidebar-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav li {
  margin-bottom: 0.25rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-item:hover {
  background-color: var(--bg-input);
  color: var(--text-primary);
}

.nav-item.active {
  background-color: var(--accent-primary);
  color: #ffffff;
}

.nav-icon {
  font-size: 1rem;
}

.mobile-menu-logout { display: none; }

@media (max-width: 760px) {
  #app-sidebar {
    display: none;
    position: absolute;
    z-index: 1000;
    inset: 0 0 auto;
    width: 100%;
    min-width: 0;
    max-height: calc(100dvh - 56px);
    padding: .75rem;
    border-right: 0;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
    overflow-x: hidden;
    overflow-y: auto;
  }

  #app-sidebar.mobile-open { display: block; }

  .module-switcher {
    display: flex;
    align-items: center;
    gap: .6rem;
    margin: 0 0 .5rem;
    padding: 0 0 .5rem;
  }

  .module-switcher label {
    flex: 0 0 auto;
    margin: 0;
  }

  .module-switcher select {
    min-width: 0;
  }

  .sidebar-nav ul {
    display: grid;
    gap: .4rem;
    overflow: visible;
  }

  .sidebar-nav li {
    margin: 0;
  }

  .nav-item {
    min-height: 42px;
    padding: .55rem .7rem;
    white-space: nowrap;
  }

  .mobile-menu-logout { display: flex; align-items: center; justify-content: center; width: 100%; min-height: 44px; margin-top: .65rem; border: 1px solid var(--border-color); border-radius: 7px; background: transparent; color: var(--text-secondary); font: inherit; cursor: pointer; }
}