/*
 * Sidebar di navigazione (shared/_sidebar + sidebar_controller): drawer off-canvas da sinistra
 * con backdrop, aperto dall'hamburger nell'header. Sta sopra l'header sticky (z 20) e il
 * pannello Marina (z 30). Regole design system: una property per riga, ombre dalla scala di
 * elevazione (il drawer e' un overlay: --shadow-3), animazioni spente con prefers-reduced-motion.
 */

.app-sidebar {
  position: fixed;
  inset: 0;
  z-index: 40;
  visibility: hidden;
  transition: visibility 0s 0.2s;
}

.app-sidebar.is-open {
  visibility: visible;
  transition: visibility 0s;
}

.app-sidebar-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(16, 22, 46, 0.45);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.app-sidebar.is-open .app-sidebar-backdrop {
  opacity: 1;
}

.app-sidebar-drawer {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  width: min(300px, 84vw);
  background: var(--surface);
  border-right: 1px solid var(--border);
  box-shadow: var(--shadow-3);
  transform: translateX(-100%);
  transition: transform 0.2s ease;
}

.app-sidebar.is-open .app-sidebar-drawer {
  transform: translateX(0);
}

.app-sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 0.9rem 0 1.1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.app-sidebar-title {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gray-logo);
}

.app-sidebar-close {
  min-width: 38px;
  min-height: 38px;
  padding: 0.2rem;
  border: none;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--gray-text);
  cursor: pointer;
}

.app-sidebar-close:hover {
  background: var(--azure-soft);
  color: var(--navy);
}

.app-sidebar-body {
  flex: 1;
  padding: 0.6rem;
  overflow-y: auto;
}

.app-sidebar-section-title {
  margin: 0.9rem 0 0.25rem;
  padding: 0 0.8rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-logo);
}

.app-sidebar-section-title:first-child {
  margin-top: 0.2rem;
}

.app-sidebar-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.app-sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  min-height: 46px;
  padding: 0.6rem 0.8rem;
  border: none;
  border-radius: var(--radius-small);
  background: transparent;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}

.app-sidebar-link .icon {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  color: var(--gray-logo);
}

.app-sidebar-link:hover {
  background: var(--azure-soft);
}

.app-sidebar-link.is-active {
  background: var(--azure-soft);
  font-weight: 600;
  color: var(--navy);
}

.app-sidebar-link.is-active .icon {
  color: var(--navy);
}

.app-sidebar-foot {
  padding: 0.6rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.app-sidebar-foot form {
  display: block;
}

.app-sidebar-logout {
  font-family: inherit;
}

.app-sidebar-logout:hover {
  background: #fdecea;
  color: var(--danger);
}

.app-sidebar-logout:hover .icon {
  color: var(--danger);
}

/* Hamburger nell'header: solo icona, sempre (il nome accessibile e' l'aria-label). */

.btn-menu {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 0.45rem;
}

.btn-menu .icon {
  width: 1.25rem;
  height: 1.25rem;
}

@media (prefers-reduced-motion: reduce) {
  .app-sidebar,
  .app-sidebar-backdrop,
  .app-sidebar-drawer {
    transition: none;
  }
}