/* Header Layout */
.deh-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(5, 7, 11, 0.95), rgba(5, 7, 11, 0.88), rgba(5, 7, 11, 0.85));
  border-bottom: 1px solid var(--color-border-subtle);
}

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

/* Brand */
.deh-header__brand {
  display: flex;
  align-items: center;
}

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

.deh-header__logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 30% 70% 65% 35% / 40% 30% 70% 60%;
  background: radial-gradient(circle at 30% 20%, var(--color-primary-strong), transparent 55%),
    radial-gradient(circle at 80% 80%, #ff4f64, transparent 60%),
    linear-gradient(135deg, #05070b, #111623);
  box-shadow: 0 0 18px rgba(0, 224, 255, 0.5);
  position: relative;
}

.deh-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 25%;
  border-radius: inherit;
  border: 1px solid rgba(245, 247, 255, 0.35);
  mix-blend-mode: screen;
}

.deh-header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.deh-header__logo-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.deh-header__logo-sub {
  font-size: var(--font-size-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-soft);
}

/* Navigation */
.deh-header__nav {
  display: flex;
}

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

.deh-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding-block: 0.3rem;
  font-size: var(--font-size-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-soft);
}

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

.deh-header__nav-link:hover,
.deh-header__nav-link:focus-visible {
  color: var(--color-primary-strong);
}

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

.deh-header__nav-item--highlight .deh-header__nav-link--cta {
  padding-inline: 1.1rem;
  padding-block: 0.45rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 224, 255, 0.6);
  background: radial-gradient(circle at 0 0, rgba(0, 224, 255, 0.25), transparent 55%),
    linear-gradient(135deg, #05070b, #0b0f17);
  box-shadow: 0 0 16px rgba(0, 224, 255, 0.28);
  color: var(--color-text);
}

.deh-header__nav-item--highlight .deh-header__nav-link--cta::after {
  display: none;
}

.deh-header__nav-item--highlight .deh-header__nav-link--cta:hover,
.deh-header__nav-item--highlight .deh-header__nav-link--cta:focus-visible {
  border-color: var(--color-primary-strong);
  box-shadow: 0 0 22px rgba(0, 224, 255, 0.4);
}

/* Mobile Menu Toggle */
.deh-header__menu-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
}

.deh-header__menu-toggle-box {
  width: 22px;
  height: 18px;
  position: relative;
}

.deh-header__menu-toggle-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-fast), top var(--transition-normal), bottom var(--transition-normal);
}

.deh-header__menu-toggle-line--top {
  top: 0;
}

.deh-header__menu-toggle-line--middle {
  top: 8px;
}

.deh-header__menu-toggle-line--bottom {
  bottom: 0;
}

.deh-header__menu-toggle[aria-expanded="true"] .deh-header__menu-toggle-line--top {
  top: 8px;
  transform: rotate(45deg);
}

.deh-header__menu-toggle[aria-expanded="true"] .deh-header__menu-toggle-line--middle {
  opacity: 0;
}

.deh-header__menu-toggle[aria-expanded="true"] .deh-header__menu-toggle-line--bottom {
  bottom: 8px;
  transform: rotate(-45deg);
}

.deh-header__menu-toggle-text {
  display: inline-block;
}

/* Responsive */
@media (max-width: 864px) {
  .deh-header__inner {
    padding-block: var(--space-2);
  }

  .deh-header__menu-toggle {
    display: inline-flex;
  }

  .deh-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: radial-gradient(circle at top, rgba(0, 224, 255, 0.12), transparent 55%),
      linear-gradient(to bottom, #05070b, #05070b, #05070b);
    border-bottom: 1px solid var(--color-border-subtle);
    transform-origin: top;
    transform: scaleY(0.85);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
  }

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

  .deh-header__nav-link {
    font-size: var(--font-size-md);
  }

  .deh-header__nav--open {
    opacity: 1;
    transform: scaleY(1);
    pointer-events: auto;
  }
}

@media (max-width: 520px) {
  .deh-header__logo-title {
    font-size: 0.95rem;
  }

  .deh-header__logo-sub {
    display: none;
  }
}

/* Skip-link (if present in layout) */
.skip-link {
  position: absolute;
  left: 50%;
  transform: translate(-50%, -200%);
  padding: 0.5rem 1rem;
  background-color: #000;
  color: var(--color-text);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-primary);
  z-index: 50;
}

.skip-link:focus-visible {
  transform: translate(-50%, 0.5rem);
}