/* assets/css/components/navigation.css — Section styles and local responsive rules. */
/* Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  width: 100%;
  background: rgba(4, 5, 7, 0.86);
  border-bottom: 1px solid var(--color-border-soft);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.site-header::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 1px;
  content: "";
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 90, 0, 0.42),
    transparent
  );
  opacity: 0;
  transition: opacity var(--transition-medium);
}
.site-header.is-scrolled::after { opacity: 1; }
.header-inner { display: flex; min-height: var(--header-height); align-items: center; justify-content: space-between; gap: var(--space-4); }
.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.025em;
  text-transform: uppercase;
}
.site-logo span, .site-logo strong { color: var(--color-primary); }
.site-logo:hover { color: var(--color-text); }
.main-nav { display: flex; align-items: center; justify-content: flex-end; gap: 1.25rem; }
.main-nav a {
  position: relative;
  display: inline-flex;
  padding-block: 0.45rem;
  align-items: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color var(--transition-fast),
    opacity var(--transition-fast);
}
.main-nav a::after {
  position: absolute;
  right: 0;
  bottom: -0.35rem;
  left: 0;
  height: 2px;
  content: "";
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-medium);
}
.main-nav a:hover { color: var(--color-text); }
.main-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.main-nav a.is-active, .main-nav a[aria-current="page"], .main-nav a[aria-current="true"] { color: var(--color-primary); }
.main-nav a.is-active::after, .main-nav a[aria-current="page"]::after, .main-nav a[aria-current="true"]::after { transform: scaleX(1); }
.menu-toggle {
  position: relative;
  display: none;
  width: 46px;
  height: 46px;
  padding: 0;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: var(--surface-inset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast);
}
.menu-toggle:hover { background: var(--color-primary-soft); border-color: var(--color-border-primary); }
.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-round);
  transition: background-color var(--transition-fast),
    transform var(--transition-medium),
    opacity var(--transition-medium);
}
.menu-toggle span + span { margin-top: 5px; }
.menu-toggle.is-open span:nth-child(1), .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2), .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle.is-open span:nth-child(3), .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }