/* Header (IdleGameMaster) */
.igm-header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  background: linear-gradient(180deg, rgba(37,40,55,0.95), rgba(26,29,46,0.9));
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(6px);
}

.igm-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: var(--space-4);
}

/* Brand */
.igm-header .brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-parchment);
  font-weight: 800;
  letter-spacing: 0.02em;
}
.igm-header .brand-logo {
  width: 36px; height: 36px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
}
.igm-header .brand-text {
  font-family: var(--font-pixel);
  font-size: var(--text-lg);
  text-shadow: 0 2px 6px rgba(0,0,0,0.6);
}

/* Nav */
.primary-nav .nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.primary-nav a {
  color: var(--color-parchment);
  font-weight: 600;
  padding: var(--space-2) var(--space-1);
  border-radius: var(--radius-sm);
  position: relative;
}
.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-ember-orange), var(--color-forest-green));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}
.primary-nav a:hover::after,
.primary-nav a:focus-visible::after,
.primary-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}
.primary-nav a[aria-current="page"] {
  color: var(--color-primary);
}

/* Menu toggle */
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px; height: 42px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-parchment);
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.menu-toggle:hover { background: rgba(244,228,193,0.06); transform: translateY(-1px); }
.menu-toggle:active { transform: translateY(0); }

/* Backdrop for mobile */
.menu-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(2px);
}

/* Mobile behavior (progressive enhancement) */
@media (max-width: 1024px) {
  .menu-toggle { display: inline-flex; }
  .hidden-mobile { display: none; }

  /* Base: nav is visible if JS disabled. JS will add .is-collapsible to enable off-canvas */
  .igm-header.is-collapsible .primary-nav {
    position: fixed;
    right: 0; top: 64px; bottom: 0;
    width: min(86vw, 360px);
    background: var(--color-background-elevated);
    border-left: 1px solid var(--color-border);
    box-shadow: var(--shadow-2xl);
    transform: translateX(100%);
    transition: transform var(--transition-slower);
    padding: var(--space-6);
  }
  .igm-header.is-collapsible .primary-nav .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }
  .igm-header.is-open .primary-nav { transform: translateX(0); }
  .igm-header.is-open .menu-toggle { border-color: var(--color-primary); color: var(--color-primary); }
}

/* High contrast visible focus already in base.css; ensure ring on toggle */
.menu-toggle:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }