/* Header styles for Build Nova */

.bn-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(16px);
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.9));
  border-bottom: 1px solid rgba(31, 41, 55, 0.85);
}

.bn-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

/* Brand */

.bn-header__brand {
  flex: 0 0 auto;
}

.bn-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-neutral-50);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.bn-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background:
    conic-gradient(from 180deg at 50% 50%, var(--color-primary), var(--color-accent), var(--color-primary));
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.8), var(--shadow-sm);
}

.bn-header__logo-text {
  font-size: 1.1rem;
}

.bn-header__logo-accent {
  color: var(--color-accent);
}

/* Toggle (mobile) */

.bn-header__toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(15, 23, 42, 0.8);
  color: var(--color-neutral-100);
}

.bn-header__toggle:hover {
  background-color: rgba(15, 23, 42, 1);
}

.bn-header__toggle-icon {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
}

.bn-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-neutral-100);
  transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-normal);
}

.bn-header__toggle-text {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Nav */

.bn-header__nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-6);
  flex: 1 1 auto;
}

.bn-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.bn-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  padding-block: 0.25rem;
}

.bn-header__nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -0.35rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-normal);
}

.bn-header__nav-link:hover,
.bn-header__nav-link:focus-visible {
  color: var(--color-neutral-50);
}

.bn-header__nav-link:hover::after,
.bn-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

/* Actions */

.bn-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.bn-header__icon-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(37, 99, 235, 0.45);
  background: radial-gradient(circle at top left, var(--color-primary-soft), transparent 55%), rgba(15, 23, 42, 0.85);
  color: var(--color-neutral-50);
  font-size: var(--font-size-xs);
}

.bn-header__icon-link--ghost {
  border-color: var(--color-border-subtle);
  background: rgba(15, 23, 42, 0.7);
  color: var(--color-text-muted);
}

.bn-header__icon-link i {
  font-size: 0.85rem;
}

.bn-header__icon-link:hover {
  border-color: var(--color-primary);
  background: radial-gradient(circle at top left, var(--color-primary-soft), transparent 55%), rgba(15, 23, 42, 1);
}

.bn-header__icon-link--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-neutral-50);
}

.bn-header__icon-label {
  display: inline-block;
}

/* Responsive behavior */

@media (max-width: 900px) {
  .bn-header__toggle {
    display: inline-flex;
  }

  .bn-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 56px;
    background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 60%), var(--color-surface);
    border-bottom: 1px solid rgba(31, 41, 55, 0.9);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4) var(--space-4) var(--space-6);
    gap: var(--space-4);
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .bn-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }

  .bn-header__nav-link {
    padding-block: 0.6rem;
    padding-inline: 0.4rem;
    border-radius: var(--radius-md);
  }

  .bn-header__nav-link::after {
    display: none;
  }

  .bn-header__actions {
    justify-content: flex-start;
  }

  .bn-header__icon-label {
    font-size: var(--font-size-sm);
  }

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

  .bn-header__toggle[aria-expanded="true"] .bn-header__toggle-bar:nth-child(1) {
    transform: translateY(5px) rotate(45deg);
  }

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

  .bn-header__toggle[aria-expanded="true"] .bn-header__toggle-bar:nth-child(3) {
    transform: translateY(-5px) rotate(-45deg);
  }
}

@media (max-width: 600px) {
  .bn-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .bn-header__logo-text {
    font-size: 1rem;
  }

  .bn-header__logo-mark {
    width: 28px;
    height: 28px;
  }

  .bn-header__actions {
    justify-content: space-between;
  }

  .bn-header__icon-label {
    display: none;
  }
}

/* Utility class added by JS when mobile menu is open to prevent background scroll */
.bn-header--menu-open {
  overflow: hidden;
}