/* Header layout & branding */
.grb-header__inner {
  align-items: center;
  gap: var(--space-4);
}

.grb-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.grb-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.grb-header__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-lg);
  background: conic-gradient(from 160deg, #4c6fff, #922ff9, #3ecf8e, #4c6fff);
  box-shadow: var(--shadow-sm);
  font-family: "Space Grotesk", var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.grb-header__logo-text {
  display: flex;
  flex-direction: column;
}

.grb-header__logo-title {
  font-family: "Space Grotesk", var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
}

.grb-header__logo-subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Desktop navigation */
.grb-header__nav {
  margin-left: auto;
}

.grb-header__nav-list {
  align-items: center;
}

.grb-header__nav-item {
  list-style: none;
}

/* Mobile toggle */
.grb-header__toggle {
  display: none;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(9, 12, 20, 0.9);
  color: var(--color-text);
  font-size: var(--font-size-xs);
  font-weight: 600;
  cursor: pointer;
}

.grb-header__toggle-icon {
  position: relative;
  width: 18px;
  height: 12px;
}

.grb-header__toggle-icon::before,
.grb-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), #922ff9);
  transition: transform var(--transition-base), top var(--transition-base), bottom var(--transition-base), opacity var(--transition-base);
}

.grb-header__toggle-icon::before {
  top: 1px;
}

.grb-header__toggle-icon::after {
  bottom: 1px;
}

/* Open state */
.grb-header__toggle[aria-expanded="true"] .grb-header__toggle-icon::before {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.grb-header__toggle[aria-expanded="true"] .grb-header__toggle-icon::after {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 900px) {
  .grb-header__inner {
    gap: var(--space-2);
  }

  .grb-header__logo-subtitle {
    display: none;
  }

  .grb-header__toggle {
    display: inline-flex;
  }

  .grb-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 3.25rem;
    background: radial-gradient(circle at 0 0, #141929 0, #05060a 55%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
  }

  .grb-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-4) var(--space-5);
  }

  .grb-header__nav-item + .grb-header__nav-item {
    margin-top: var(--space-2);
  }

  .grb-header__nav--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
}

@media (max-width: 600px) {
  .grb-header__logo-title {
    font-size: 0.95rem;
  }
}

/* Ensure nav visible when JS disabled */
.no-js .grb-header__nav {
  transform: none !important;
  opacity: 1 !important;
  pointer-events: auto !important;
  position: static;
  border-bottom: none;
}

/* Utility: prevent body scroll when mobile menu open */
body.grb-nav-open {
  overflow: hidden;
}