/* Header-specific styles for SEA */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  backdrop-filter: blur(18px);
  background: linear-gradient(
    to bottom,
    rgba(2, 6, 23, 0.96),
    rgba(2, 6, 23, 0.78),
    rgba(2, 6, 23, 0)
  );
  border-bottom: 1px solid rgba(15, 23, 42, 0.9);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

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

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-header__logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 40% 60% 70% 30%;
  background: radial-gradient(circle at 30% 20%, #6cf0ff, #40d3ea 45%, #020617 80%);
  box-shadow: var(--shadow-glow-primary);
  position: relative;
  overflow: hidden;
}

.site-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: inherit;
  border: 1px solid rgba(15, 23, 42, 0.75);
}

.site-header__logo-text {
  text-shadow: 0 0 12px rgba(108, 240, 255, 0.35);
}

/* Navigation */

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--font-size-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-header__nav-item a {
  position: relative;
  padding-block: 0.2rem;
  color: var(--color-text-muted);
}

.site-header__nav-item a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: center;
  background: linear-gradient(90deg, #40d3ea, #6cf0ff);
  transition: transform var(--transition-base), opacity var(--transition-base);
  opacity: 0.4;
}

.site-header__nav-item a:hover,
.site-header__nav-item a:focus-visible {
  color: var(--color-primary);
}

.site-header__nav-item a:hover::after,
.site-header__nav-item a[aria-current="page"]::after {
  transform: scaleX(1);
  opacity: 1;
}

.site-header__nav-item a[aria-current="page"] {
  color: var(--color-primary);
}

.site-header__nav-item--cta {
  margin-left: var(--space-2);
}

.site-header__cta-icon {
  font-size: 0.9rem;
}

/* Mobile toggle */

.site-header__toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.45);
  background-color: rgba(15, 23, 42, 0.9);
  color: var(--color-text-muted);
  cursor: pointer;
}

.site-header__toggle-icon {
  position: relative;
  width: 18px;
  height: 14px;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
}

.site-header__toggle-icon span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: var(--radius-full);
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.site-header__toggle-label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

/* Open state */

.site-header--menu-open .site-header__toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header--menu-open .site-header__toggle-icon span:nth-child(2) {
  opacity: 0;
}

.site-header--menu-open .site-header__toggle-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive layout */

@media (max-width: 960px) {
  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 4.25rem;
    background: radial-gradient(circle at top, #020617, #020617 65%);
    border-bottom: 1px solid rgba(15, 23, 42, 0.9);
    transform-origin: top;
    transform: scaleY(0.8);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }

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

  .site-header__nav-item--cta {
    width: 100%;
  }

  .site-header__nav-item--cta .btn {
    width: 100%;
    justify-content: center;
  }

  .site-header--menu-open .site-header__nav {
    opacity: 1;
    visibility: visible;
    transform: scaleY(1);
  }
}

@media (max-width: 480px) {
  .site-header__logo-text {
    font-size: 0.85rem;
  }

  .site-header__inner {
    gap: var(--space-2);
  }
}