/* App Shell */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  min-height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: var(--z-sidebar);
  transition: width var(--transition-base), transform var(--transition-base);
  overflow: hidden;
}

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

.sidebar-header {
  padding: var(--space-lg) var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--border);
  min-height: 72px;
}

.logo-container {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

.logo-container img { width: 100%; height: 100%; object-fit: contain; }
.logo-placeholder {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.05em;
}

.brand-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--transition-base);
}

.sidebar.collapsed .brand-name { opacity: 0; width: 0; }

.sidebar-nav {
  flex: 1;
  padding: var(--space-md) var(--space-sm);
  overflow-y: auto;
  overflow-x: hidden;
}

.nav-section-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: var(--space-sm) var(--space-sm);
  margin-top: var(--space-sm);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--transition-base);
}

.sidebar.collapsed .nav-section-label { opacity: 0; }

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px var(--space-sm);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
  margin-bottom: 2px;
}

.nav-item:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.nav-item.active { background: var(--accent-soft); color: var(--accent); }
.nav-item.active .nav-icon { color: var(--accent); }

.nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-label {
  transition: opacity var(--transition-base);
  overflow: hidden;
}

.sidebar.collapsed .nav-label { opacity: 0; width: 0; }

.sidebar-footer {
  padding: var(--space-md);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.sidebar-toggle {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-left: auto;
}

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

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

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

/* Top Bar */
.topbar {
  height: 64px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
}

.topbar-left { display: flex; align-items: center; gap: var(--space-md); }
.topbar-right { display: flex; align-items: center; gap: var(--space-sm); }

.page-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Page Content */
.page-content {
  flex: 1;
  padding: var(--space-xl);
  max-width: 1400px;
  width: 100%;
}

/* Grid Layouts */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-lg); }

/* Views */
.view { display: none; }
.view.active { display: block; }

/* Responsive */
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.mobile-open { transform: translateX(0); }
  .main-content { margin-left: 0 !important; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .page-content { padding: var(--space-md); }
  .topbar { height: 56px; }
  .page-title { font-size: 1rem; }
}

@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .topbar { padding: 0 var(--space-sm); height: 52px; }
  .page-content { padding: var(--space-sm); }
}

@media (max-width: 480px) {
  .grid-2, .grid-3, .grid-4, .grid-auto { grid-template-columns: 1fr; }
  .page-content { padding: var(--space-xs) var(--space-sm); }
}