/* BookFlow Dashboard — Layout: Sidebar + Topbar + Content */

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

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

.sidebar-header {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  gap: var(--space-sm);
  flex-shrink: 0;
}

.sidebar-logo {
  width: 28px; height: 28px;
  background: var(--accent);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 700; font-size: var(--text-lg);
  flex-shrink: 0;
}

.sidebar-brand {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  transition: opacity var(--transition-fast);
}

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

.sidebar-nav {
  flex: 1;
  padding: var(--space-sm) 0;
  overflow-y: auto;
}

.nav-group-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--space-lg) var(--space-lg) var(--space-xs);
  white-space: nowrap;
}

.sidebar.collapsed .nav-group-label {
  text-align: center;
  padding: var(--space-md) var(--space-xs) var(--space-xs);
  font-size: 0;
}

.sidebar.collapsed .nav-group-label::after {
  content: '···';
  font-size: var(--text-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  height: 40px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
  gap: var(--space-md);
  white-space: nowrap;
}

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

.nav-item.active {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-left-color: var(--accent);
}

.nav-icon {
  width: 20px; height: 20px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-lg);
}

.nav-label { transition: opacity var(--transition-fast); }
.sidebar.collapsed .nav-label { opacity: 0; width: 0; }

.sidebar-footer {
  padding: var(--space-md);
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.sidebar-toggle {
  width: 100%;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

/* === Topbar === */
.topbar {
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  height: var(--topbar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  z-index: 90;
  transition: left var(--transition-base);
}

.sidebar.collapsed ~ .topbar { left: var(--sidebar-collapsed); }

.topbar-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

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

.topbar-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

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

.notification-badge {
  position: absolute;
  top: 4px; right: 4px;
  width: 8px; height: 8px;
  background: var(--color-error);
  border-radius: 50%;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.topbar-user:hover { background: var(--bg-hover); }

.topbar-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: var(--text-sm);
  font-weight: 600;
}

/* === Main Content === */
.main-content {
  margin-left: var(--sidebar-width);
  margin-top: var(--topbar-height);
  padding: var(--space-lg);
  min-height: calc(100vh - var(--topbar-height));
  transition: margin-left var(--transition-base);
}

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

/* === Detail Panel (Slide-out) === */
.detail-panel {
  position: fixed;
  top: var(--topbar-height);
  right: -500px;
  width: 480px;
  height: calc(100vh - var(--topbar-height));
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-primary);
  z-index: 80;
  overflow-y: auto;
  transition: right 300ms ease-out;
  box-shadow: var(--shadow-lg);
}

.detail-panel.open { right: 0; }

.detail-panel-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.detail-panel-close {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
}

.detail-panel-close:hover { background: var(--bg-hover); color: var(--text-primary); }

.detail-panel-body { padding: var(--space-lg); }