/**
 * Hamburger Menu Button
 * =====================
 * CSS-only hamburger icon that animates to X when active.
 * Uses design system colors from :root in style.css.
 * Only visible on mobile (≤768px) via .mobile-only class.
 */

/* --------------------------------------
   Hamburger Button Container
   -------------------------------------- */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 10px;
  margin-right: 0.75rem;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 110; /* Above header (100) */
  
  /* Touch-friendly tap target */
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.hamburger-btn:focus {
  outline: none;
}

.hamburger-btn:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

/* --------------------------------------
   Hamburger Icon (3 Lines)
   -------------------------------------- */
.hamburger-icon {
  position: relative;
  width: 24px;
  height: 18px;
}

.hamburger-icon span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--neon-cyan);
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 8px var(--neon-cyan);
}

/* Top line */
.hamburger-icon span:nth-child(1) {
  top: 0;
}

/* Middle line */
.hamburger-icon span:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}

/* Bottom line */
.hamburger-icon span:nth-child(3) {
  bottom: 0;
}

/* --------------------------------------
   Hover State
   -------------------------------------- */
.hamburger-btn:hover .hamburger-icon span {
  background: var(--text-primary);
  box-shadow: 0 0 12px var(--neon-cyan);
}

/* --------------------------------------
   Active/Open State (X Animation)
   -------------------------------------- */
.hamburger-btn.is-active .hamburger-icon span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.hamburger-btn.is-active .hamburger-icon span:nth-child(2) {
  opacity: 0;
  transform: translateY(-50%) scaleX(0);
}

.hamburger-btn.is-active .hamburger-icon span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* Active state glow */
.hamburger-btn.is-active .hamburger-icon span {
  background: var(--neon-pink);
  box-shadow: 0 0 12px var(--neon-pink);
}

/* --------------------------------------
   Mobile Header Adjustment
   Ensure hamburger + tabs fit properly
   -------------------------------------- */
@media (max-width: 768px) {
  .header {
    padding: 0.5rem 1rem;
  }
  
  /* Flex container for hamburger and header content */
  .header-left {
    display: flex;
    align-items: center;
  }
}