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

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform 0.35s var(--ease-out);
}

.sidebar-header {
  padding: 1.25rem 1rem;
  border-bottom: 1px solid var(--border-light);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-logo-text {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  line-height: 1.2;
}
.sidebar-logo-text span {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Logo cube */
.data-cube {
  position: relative;
  width: 36px;
  height: 36px;
  transform-style: preserve-3d;
  transform: rotateX(-20deg) rotateY(25deg);
  flex-shrink: 0;
}
.data-cube .face {
  position: absolute;
  width: 36px;
  height: 36px;
  border: 2px solid var(--accent);
  background: rgba(255, 94, 0, 0.08);
}
.data-cube .front  { transform: translateZ(18px); }
.data-cube .back   { transform: rotateY(180deg) translateZ(18px); }
.data-cube .left   { transform: rotateY(-90deg) translateZ(18px); }
.data-cube .right  { transform: rotateY(90deg) translateZ(18px); }
.data-cube .top    { transform: rotateX(90deg) translateZ(18px); }
.data-cube .bottom { transform: rotateX(-90deg) translateZ(18px); }
.data-cube .lightning {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 0.85rem;
  transform: translateZ(20px);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem 0;
}

.sidebar-section { margin-bottom: 0.25rem; }

.sidebar-section-label {
  padding: 0.75rem 1.25rem 0.35rem;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 1.25rem;
  margin: 1px 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  background: none;
  width: calc(100% - 1rem);
  text-align: left;
}
.sidebar-link .icon {
  width: 18px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.7;
}
.sidebar-link:hover {
  background: var(--accent-muted);
  color: var(--text-primary);
}
.sidebar-link:hover .icon { opacity: 1; }
.sidebar-link.active {
  background: var(--accent-muted);
  color: var(--accent);
}
.sidebar-link.active .icon { opacity: 1; color: var(--accent); }

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

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem;
  border-radius: var(--radius-md);
}
.sidebar-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-muted);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.sidebar-user-info { flex: 1; min-width: 0; }
.sidebar-user-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar-user-role {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: capitalize;
}

/* ── Main content ── */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  height: var(--topbar-height);
  background: var(--bg-topbar);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.topbar-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.topbar-stat {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.topbar-stat .amount { font-weight: 700; color: var(--accent); }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.4rem;
}

.page-content {
  flex: 1;
  padding: 1.5rem;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.page-header h1 {
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.view { display: none; opacity: 0; }
.view.active { display: block; opacity: 1; }

/* Grids */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; }

@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .mobile-menu-btn { display: block; }
}