/* ============================================================
   DiveLog DS — Component: Hamburger
   Bottone menu hamburger animato (3 linee → X).
   Usato da: topbar, drawer.
   v3.1 — DDR-004: rilevante solo su mobile (< 600px), dato che il
   topbar che lo ospita e' nascosto su desktop (topbar.css). Nessuna
   modifica di stile necessaria qui: il componente e' semplicemente
   invisibile quando il suo contenitore lo e'.
   Token: --color-text-primary, --color-primary,
          --radius-small, --motion-medium, --ease-standard,
          --space-2
   ============================================================ */

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  border-radius: var(--radius-small);
  background: none;
  border: none;
  cursor: pointer;
  min-width: 48px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
}

.hamburger:hover {
  background: var(--color-surface-container);
}

.hamburger:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--motion-medium) var(--ease-standard),
              opacity var(--motion-medium) var(--ease-standard);
}

/* Stato aperto: animazione in X */
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .hamburger__line {
    transition: none;
  }
}