/* Header styles for Ultimate Delve */

.ud-site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(20px);
  background: linear-gradient(to right, rgba(5, 8, 18, 0.96), rgba(5, 8, 18, 0.9));
  border-bottom: 1px solid rgba(116, 132, 214, 0.32);
}

.ud-site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

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

.ud-site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: var(--font-size-sm);
}

.ud-site-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 30% 70% 60% 40% / 40% 40% 60% 60%;
  background: radial-gradient(circle at 30% 20%, var(--color-accent-cyan), transparent 55%),
              radial-gradient(circle at 70% 80%, var(--color-accent-magenta), transparent 55%),
              radial-gradient(circle at 10% 90%, var(--color-accent-purple), transparent 55%);
  box-shadow: 0 0 18px rgba(91, 141, 255, 0.7);
}

.ud-site-header__logo-text {
  color: #ffffff;
  text-shadow: 0 0 18px rgba(65, 224, 255, 0.35);
}

/* Navigation */

.ud-site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

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

.ud-site-header__nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-soft);
  position: relative;
  padding-block: 0.2rem;
}

.ud-site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-cyan));
  transition: width var(--transition-normal);
}

.ud-site-header__nav-link:hover,
.ud-site-header__nav-link:focus-visible {
  color: #ffffff;
}

.ud-site-header__nav-link:hover::after,
.ud-site-header__nav-link:focus-visible::after,
.ud-site-header__nav-link.ud-site-header__nav-link--active::after {
  width: 100%;
}

.ud-site-header__cta-wrap {
  margin-left: var(--space-4);
}

.ud-site-header__cta {
  font-size: var(--font-size-xs);
  padding-inline: 1.25rem;
}

/* Mobile toggle */

.ud-site-header__toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 34px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(140, 151, 214, 0.6);
  background: rgba(7, 10, 26, 0.9);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.ud-site-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: #ffffff;
  transition: transform var(--transition-normal), opacity var(--transition-normal), width var(--transition-normal);
}

.ud-site-header__toggle:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 3px;
}

/* Toggle animation when open */

.ud-site-header__toggle.is-open .ud-site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.ud-site-header__toggle.is-open .ud-site-header__toggle-bar:nth-child(2) {
  opacity: 0;
  width: 0;
}

.ud-site-header__toggle.is-open .ud-site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive layout */

@media (max-width: 900px) {
  .ud-site-header__toggle {
    display: inline-flex;
    flex-direction: column;
  }

  .ud-site-header__nav {
    position: fixed;
    inset-block-start: 64px;
    inset-inline: 0;
    background: radial-gradient(circle at top, rgba(16, 24, 64, 0.96), rgba(3, 5, 16, 0.97));
    border-top: 1px solid rgba(116, 132, 214, 0.4);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    padding: var(--space-10) var(--space-8) var(--space-12);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .ud-site-header__nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .ud-site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }

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

  .ud-site-header__cta-wrap {
    width: 100%;
    margin-left: 0;
    margin-top: var(--space-8);
  }

  .ud-site-header__cta {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .ud-site-header__logo-text {
    font-size: var(--font-size-xs);
  }
}