.app-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--sidebar);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 40;
}

.sidebar-brand {
  display: flex;
  gap: 0.85rem;
  align-items: center;
  padding: 0.5rem 0.65rem 1.5rem;
}

.brand-mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: block;
  object-fit: contain;
  padding: 4px;
  border-radius: 12px;
  background: #fff;
}

.sidebar-brand strong {
  display: block;
  color: #fff;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.sidebar-brand small {
  color: #8fa0b8;
  font-size: 0.75rem;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
  overflow-y: auto;
}

.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.85rem;
  border-radius: 10px;
  color: var(--sidebar-text);
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
  font-size: 0.92rem;
}

.sidebar-nav .nav-link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

.sidebar-nav .nav-link.active {
  background: var(--sidebar-active);
  color: #fff;
}

.nav-group {
  margin-top: 0.55rem;
}

.nav-group-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  border: 0;
  background: transparent;
  color: #8fa0b8;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
}

.nav-group-toggle i {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}

.nav-group.collapsed .nav-group-toggle i {
  transform: rotate(-90deg);
}

.nav-group.collapsed .nav-group-items {
  display: none;
}

.nav-module {
  margin-bottom: 0.2rem;
}

.nav-module-link {
  font-weight: 600;
}

.nav-sub {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.1rem 0 0.35rem 0.85rem;
}

.nav-sub-link {
  display: block;
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  color: #9aabbf;
  font-size: 0.8rem;
}

.nav-sub-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.nav-sub-link.active {
  color: #fff;
  background: rgba(61, 207, 176, 0.14);
}

.module-shell {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.area-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-bottom: 0.15rem;
  border-bottom: 1px solid var(--border);
}

.area-subnav-item {
  padding: 0.5rem 0.9rem;
  border-radius: 9px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px solid transparent;
}

.area-subnav-item:hover {
  color: var(--text);
  background: var(--bg-muted);
}

.area-subnav-item.active {
  color: var(--text);
  background: var(--surface);
  border-color: var(--border);
}

.module-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.module-tab {
  padding: 0.55rem 0.95rem;
  border-radius: 9px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.module-tab:hover {
  color: var(--text);
  background: var(--bg-muted);
}

.module-tab.active {
  color: #fff;
  background: var(--primary);
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-chip-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.15;
}

.user-chip-meta span {
  font-size: 0.9rem;
  font-weight: 600;
}

.user-chip-meta small {
  color: var(--text-muted);
  font-size: 0.72rem;
}

.sidebar-footer {
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.theme-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--sidebar-text);
  border-radius: 10px;
  padding: 0.65rem 0.85rem;
  cursor: pointer;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

.main {
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.75rem 0.5rem;
}

.topbar-title h1 {
  margin: 0;
  font-size: 1.45rem;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.topbar-title p {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.topbar-actions {
  margin-left: auto;
}

.content {
  padding: 1rem 1.75rem 2.5rem;
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.btn-icon {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
}

@media (max-width: 960px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-105%);
    transition: transform 0.25s ease;
    width: 270px;
  }

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

  .btn-icon {
    display: inline-flex;
  }

  .topbar, .content {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}