/* Header shell styles for Ontwerp Brand
 * Builds on base.css navigation shell
 */

.shell-header {
  backdrop-filter: blur(18px);
  background-color: rgba(247, 247, 247, 0.92);
}

.shell-header__inner {
  gap: var(--space-4);
}

/* Brand / Logo */

.shell-header__brand {
  display: flex;
  align-items: center;
}

.shell-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.shell-header__logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 9px;
  background: radial-gradient(circle at 0 0, var(--accent-1), transparent 55%),
              radial-gradient(circle at 100% 100%, var(--accent-2), transparent 55%),
              var(--gray-900);
  box-shadow: var(--shadow-sm);
}

.shell-header__logo-text {
  white-space: nowrap;
}

/* Primary navigation */

.shell-header__nav {
  margin-left: auto;
}

.shell-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.shell-header__nav-link {
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  padding-bottom: 4px;
}

.shell-header__nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(to right, var(--accent-1), var(--accent-2));
  transform-origin: left;
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

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

.shell-header__nav-item--primary {
  margin-left: var(--space-4);
}

.shell-header__cta {
  padding-inline: 1.25rem;
}

/* Mobile toggle */

.shell-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.12);
  background-color: rgba(255, 255, 255, 0.9);
}

.shell-header__toggle-box {
  position: relative;
  width: 1.25rem;
  height: 1rem;
}

.shell-header__toggle-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-900);
  transition:
    transform var(--transition-base),
    opacity var(--transition-base),
    top var(--transition-base),
    bottom var(--transition-base);
}

.shell-header__toggle-line--top {
  top: 0;
}

.shell-header__toggle-line--middle {
  top: 50%;
  transform: translateY(-50%);
}

.shell-header__toggle-line--bottom {
  bottom: 0;
}

/* Toggle active (menu open) */

.shell-header--menu-open .shell-header__toggle-line--top {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.shell-header--menu-open .shell-header__toggle-line--middle {
  opacity: 0;
}

.shell-header--menu-open .shell-header__toggle-line--bottom {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* Responsive behaviour */

@media (max-width: 768px) {
  .shell-header__toggle {
    display: inline-flex;
  }

  .shell-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 4.25rem;
    background-color: rgba(247, 247, 247, 0.98);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
    backdrop-filter: blur(16px);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    pointer-events: none;
    transition:
      opacity var(--transition-base),
      transform var(--transition-base),
      visibility var(--transition-base);
    visibility: hidden;
  }

  .shell-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--container-padding-x) var(--space-6);
    gap: var(--space-3);
  }

  .shell-header__nav-item--primary {
    margin-left: 0;
    margin-top: var(--space-2);
  }

  .shell-header--menu-open .shell-header__nav {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
    transform: scaleY(1);
  }
}

@media (max-width: 480px) {
  .shell-header__logo-text {
    font-size: var(--font-size-sm);
  }
}