/* ============================================
   EG4NET v2 — Layout
   Shell, sidebar, topbar, content grid
   ============================================ */

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

/* --- Sidebar Overlay (mobile) --- */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}
.sidebar-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  overflow-y: auto;
  overflow-x: hidden;
}
.sidebar.open {
  transform: translateX(0);
}

/* Sidebar Header */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border-subtle);
}
.sidebar-header h2 {
  font-size: 1.125rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-primary), var(--text-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.sidebar-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.sidebar-close:hover {
  background: var(--sidebar-hover-bg);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

/* Sidebar Navigation */
.nav-list {
  flex: 1;
  padding: 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 18px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 1.05rem;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: all var(--transition-fast);
  position: relative;
}
.nav-item:hover {
  background: var(--sidebar-hover-bg);
  color: var(--text-primary);
}
.nav-item.active {
  background: var(--sidebar-active-bg);
  color: var(--text-accent);
  font-weight: 600;
}
.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--sidebar-active-border);
  box-shadow: var(--glow-accent);
}

.nav-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  opacity: 0.7;
}
.nav-item.active .nav-icon,
.nav-item:hover .nav-icon { opacity: 1; }

/* Gruppi con sottomenu */
.nav-group {
  margin: 2px 0;
}

.nav-group-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 13px 18px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 1.05rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.nav-group-toggle:hover {
  background: var(--sidebar-hover-bg);
  color: var(--text-primary);
}

.nav-group-toggle .toggle-label {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-group-arrow {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}
.nav-group-arrow::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--text-muted);
  border-bottom: 1.5px solid var(--text-muted);
  transform: rotate(-45deg);
  transition: transform var(--transition-fast);
}
.nav-group.expanded .nav-group-arrow::before {
  transform: rotate(45deg);
}

.nav-group-children {
  display: none;
  padding-left: 16px;
}
.nav-group.expanded .nav-group-children {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.nav-group-children .nav-item {
  font-size: 1rem;
  padding: 11px 18px;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-footer-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.95rem;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: all var(--transition-fast);
}
.sidebar-footer-btn:hover {
  background: var(--sidebar-hover-bg);
  color: var(--text-primary);
}
.sidebar-footer-btn.logout:hover {
  background: var(--color-error-bg);
  color: var(--color-error);
}

.sidebar-version {
  text-align: center;
  font-size: 0.6875rem;
  color: var(--text-muted);
  padding: 6px 0 2px;
  letter-spacing: 0.04em;
}

/* --- Topbar --- */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg-topbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: var(--z-topbar);
  transition: background var(--transition-slow);
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hamburger-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.hamburger-btn:hover {
  background: var(--sidebar-hover-bg);
  border-color: var(--border-medium);
  box-shadow: var(--glow-accent);
}

.topbar-logo {
  height: 38px;
  width: auto;
  object-fit: contain;
}
.topbar-logo-text {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-primary);
}

/* Notification button */
.notification-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: transparent;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.notification-btn:hover {
  background: var(--sidebar-hover-bg);
  border-color: var(--border-medium);
}
.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  border-radius: 9px;
  background: var(--color-error);
  color: #fff;
  font-size: 0.625rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  padding: calc(var(--topbar-height) + 20px) 20px 20px;
  min-height: 100dvh;
  width: 100%;
}

/* --- Responsive: Desktop --- */
@media (min-width: 1024px) {
  .sidebar {
    width: min(320px, 25vw);
  }
  .main-content {
    padding: calc(var(--topbar-height) + 24px) 32px 32px;
  }
}

/* --- Responsive: Tablet & Mobile --- */
@media (max-width: 767px) {
  .topbar { padding: 0 12px; }
  .main-content { padding: calc(var(--topbar-height) + 12px) 12px 12px; }
  .sidebar { width: min(300px, calc(100vw - 20px)); }
}